Monday, June 23, 2008

Sukhoi Su-30MKI

The Sukhoi Su-30 MKI (NATO reporting name Flanker-H) is a variant of the Sukhoi Su-30, jointly-developed by Russia's Sukhoi Corporation and India's Hindustan Aeronautics Limited for the Indian Air Force. It is a heavy class, long-range, multi-role, air superiority fighter and strike fighter. The variant also consists of French, Israeli and Indian subsystems. The MKI variant is a much more advanced fighter jet than the basic K and MK variants and is considered a 4.5 generation fighter. Due to similar features and components, the MKI variant is often considered to be a customized Indian variant of the Sukhoi Su-35.


Su-30MKI

Su-30MKI in Service with the Indian Air Force

Type Air Superiority fighter, Multirole Fighter, Strike fighter, Heavy class fighter
Manufacturer Sukhoi & HAL
Maiden flight 1 July 1997
Introduced 27 September 2002
Status Active service
Primary user Indian Air Force
Number built Active: 116
Planned: 230
Unit cost US$47 million
Developed from Sukhoi Su-30
Variants Sukhoi Su-35



Specifications (Sukhoi Su-30MKI)

General characteristics

  • Crew: 2
  • Length: 22.10 m (72 ft 51 in)
  • Wingspan: 14.70 m (48 ft 23 in)
  • Height: 6.38 m (22 ft 89 in)
  • Wing area: 62.04 m² (667.8 ft²)
  • Empty weight: 17,700 kg (39,300 lb)
  • Loaded weight: 34,500 kg (76,100 lb)
  • Max takeoff weight: 38,800 kg (85,600 lb)
  • Powerplant: 2× Lyulka AL-31FP turbofans with thrust vectoring, 131 kN (29,400 lbf) each

Performance

BrahMos

BrahMos is a supersonic cruise missile that can be launched from submarines, ships, aircraft or land. The acronym BrahMos is perceived as the confluence of the two nations represented by two great rivers, the Brahmaputra of India and the Moskva of Russia. It is a joint venture between India's Defense Research and Development Organization and Russia's NPO Mashinostroeyenia who have together formed the BrahMos Corp. Propulsion is based on the Russian Yakhont missile, and guidance has been developed by BrahMos Corp. At speeds of Mach 2.5 to 2.8, is the world's fastest cruise missile. At about three and a half times faster than the American subsonic Harpoon cruise missile.


BrahMos

BrahMos and the launch canister on display at the International Maritime Defence Show, IMDS-2007, St. Petersburg, Russia
Type Cruise missile
Place of origin Flag of India India / Flag of Russia Russia
Service history
In service November 2006
Production history
Manufacturer Joint venture, Federal State Unitary Enterprise NPO Mashinostroeyenia (Russia) and Defense Research and Development Organization (BrahMos Corp, India)
Unit cost US$ 2.3 million[citation needed]
Specifications
Weight 3000 kg
2500 kg (air-launched)
Length 8.4 m
Diameter 0.6 m

Warhead 300 kg Conventional semi-armour-piercing

Engine Two-stage integrated Rocket/Ramjet
Operational
range
290 km
Speed Mach 2.5-2.8
Launch
platform
Ship, submarine, aircraft and land-based mobile launchers.

Saturday, June 21, 2008

HAL Tejas-->>Light Combat Aircraft (LCA)

The HAL Tejas (Sanskrit: तेजस् : "Radiant") is a 4.5 generation lightweight multirole fighter aircraft being developed by India. It is a tailless, compound delta wing design powered by a single engine. Originally known as the Light Combat Aircraft (LCA) – a designation which continues in popular usage – the aircraft was officially named "Tejas". by then Prime Minister Atal Bihari Vajpayee on 4 May 2003.

Limited series production of the Tejas commenced in 2007; it is currently projected to achieve limited initial operational clearance (IOC) with the Indian Air Force (IAF) by 2008, followed by full operational clearance (FOC) by the end of 2010. A two-seat trainer variant is also in development, as is a naval variant capable of operating from the Indian Navy's aircraft carriers. The IAF is reported to have a requirement for 200 single-seat and 20 two-seat conversion trainers, while the Indian Navy may order up to 40 single-seaters to replace its Sea Harrier FRS.51 and Harrier T.60.

Through the use of modern design techniques, lightweight materials and composites, it is expected to become the lightest modern jet fighter in production.


Tejas

Pair of Tejas flying in formation

Type
Multirole Air Superiority
Manufacturer
Aeronautical Development Agency
Hindustan Aeronautics Limited
Maiden flight 4 January 2001
Introduction Planned by 2010/11
Status Flight Testing
Primary users Indian Air Force
Indian Navy
Number built 2 Technology demonstrators + 3 Prototypes + 2 Production aircraft
Unit cost US$25 million (estimated)


Specifications (Tejas)

Three view of the Tejas


General characteristics

  • Crew: One
  • Length: 13.20 m (43 ft 4 in)
  • Wingspan: 8.20 m (26 ft 11 in)
  • Height: 4.40 m (14 ft 9 in)
  • Wing area: 38.4 m² (413 ft²)
  • Empty weight: 5,000 kg (11,200 lb)
  • Loaded weight: 12,500 kg (29,700 lb)
  • Max takeoff weight: >15,500 kg (>32,558 lb)
  • Powerplant: 1× General Electric F404-GE-F2J3 or -IN-20 turbofan, 80.5 kN (18,100 lbf) / 85 kN In case of IN-20 (>19,000 lbf) ()
  • Internal fuel capacity: 3000 liters
  • External fuel capacity: 5×800 liter tanks or 3×1,200 liter tanks, totaling 4,000/3,600 liters

Performance

Armament

Chandrayaan mission of ISRO

Chandrayaan I (Sanskrit: चंद्रयान-1, lit: Lunar Craft), is an unmanned lunar mission by the Indian Space Research Organization (ISRO). The mission includes a lunar orbiter as well as an impactor. The spacecraft will be launched by a modified version of the Polar Satellite Launch Vehicle.

The remote sensing satellite will weigh 1304 kg (590 kg initial orbit mass and 504 kg dry mass) and carry high resolution remote sensing equipment for visible, near infrared, soft and hard X-ray frequencies. Over a two-year period, it is intended to survey the lunar surface to produce a complete map of its chemical characteristics and 3-dimensional topography. The polar regions are of special interest, as they might contain water ice.

The ISRO has identified Mylswamy Annadurai as Project Chief.

ISRO is aiming to launch Chandrayaan on September 19,2008. They estimate the cost to be INR 3.8 billion (US$ 83 million).

The mission includes five ISRO payloads and six payloads from other international space agencies such as NASA and ESA, and the Bulgarian Aerospace Agency .


Mission Objectives

  • To carry out high resolution mapping of topographic features in 3D, distribution of various minerals and elemental chemical species including radioactive nuclides covering the entire lunar surface using a set of remote sensing payloads. The new set of data would help in unraveling mysteries about the origin and evolution of solar system in general and that of the moon in particular.
  • Realize the mission goal of harnessing the science payloads, lunar craft and the launch vehicle with suitable ground support system including DSN station, integration and testing, launching and achieving lunar orbit of ~100 km, in-orbit operation of experiments, communication/telecommand, telemetry data reception, quick look data and archival for scientific utilization by identified group of scientists.

Specific Areas of Study

  • High resolution mineralogical and chemical imaging of permanently shadowed north and south polar regions
  • Search for surface or sub-surface water-ice on the moon, specially at lunar pole
  • Identification of chemical end members of lunar high land rocks
  • Chemical stratigraphy of lunar crust by remote sensing of central upland of large lunar craters, South Pole Aitken Region (SPAR) etc., where interior material may be expected
  • To map the height variation of the lunar surface features along the satellite track
  • Observation of X-ray spectrum greater than 10 keV and stereographic coverage of most of the moon's surface with 5m resolution, to provide new insights in understanding the moon's origin and evolution

Payloads

Chandrayaan 1
Chandrayaan 1

The scientific payload has a total mass of 90 kg and contains six Indian instruments and six foreign instruments.

  • The Terrain Mapping Camera (TMC) has 5 m resolution and a 40 km swath in the panchromatic band and will be used to produce a high-resolution map of the Moon.
  • The Hyper Spectral Imager (HySI) will perform mineralogical mapping in the 400-900 nm band with a spectral resolution of 15 nm and a spatial resolution of 80 m.
  • The Lunar Laser Ranging Instrument (LLRI) will determine the surface topography.
  • An X-ray fluorescence spectrometer C1XS covering 1- 10 keV with a ground resolution of 25 km and a Solar X-ray Monitor (XSM) to detect solar flux in the 1–10 keV range. C1XS will be used to map the abundance of Mg, Al, Si, Ca, Ti, and Fe at the surface,nd the XSM will monitor the solar flux. This payload is a collaboration between Rutherford Appleton laboratory, U.K, ESA and ISRO.
  • A High Energy X-ray/gamma ray spectrometer (HEX) for 30- 200 keV measurements with ground resolution of 40 km, the HEX will measure U, Th, 210Pb, 222Rn degassing, and other radioactive elements
  • Moon Impact probe(MIP) developed by ISRO is in turn a small satellite that will be carried by Chandrayaan-1 and will be ejected once it reaches 100 km orbit around moon, to impact on the moon. MIP carries three more instruments namely, a high resolution mass spectrometer, an S-Band altimeter and a video camera.
  • Among foreign payloads, The Sub-keV Atom Reflecting Analyzer (SARA) from ESA will map composition using low energy neutral atoms sputtered from the surface.
  • S-band miniSAR from the APL at the Johns Hopkins University (funded by NASA) is the active SAR system to map lunar polar ice. The instrument will transmit right polarized radiation with a frequency of 2.5 GHz and will monitor the scattered left and right polarized radiation. The Fresnel reflectivity and the cicular polarization ratio (CPR) are the key parameters deduced from this measurments. Ice shows the Coherent Backscatter Opposition Effect which results in an enhancement of refelections and CPR. With the data the water content of the moon polar region can estimated.
  • Radiation Dose Monitor (RADOM-7) from Bulgaria is to map the radiation environment around the moon.

NASA Lunar Base

According to Ben Bussey, senior staff scientist at The Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland, Chandrayaan's imagery will be used to decide the future Moon Base that NASA has recently announced. Bussey told SPACE.com, "India's Chandrayaan-1 lunar orbiter, to be lofted in early 2008, has a good shot at further identifying possible water ice-laden spots with a U.S.-provided low-power imaging radar, Bussey advised--one of two U.S. experiments on the Indian Moon probe. The idea is that we find regions of interest with Chandrayaan-1 radar. We would investigate those using all the capabilities of the radar on NASA's Lunar Reconnaissance Orbiter, Bussey added, a Moon probe to be launched late in 2008."

Chandrayaan-II

Chandrayaan-II
Organization Indian Space Research Organization
Mission type Orbiter, Rover
Satellite of Moon
Launch date 2011/2012

ISRO is also planning a second version of Chandrayaan named: Chandrayaan-II. According to ISRO Chairman G. Madhavan Nair, "The Indian Space Research Organisation (ISRO) hopes to land a motorised rover on the moon in 2010 or 2011, as a part of its second Chandrayaan mission. The rover will be designed to move on wheels on the lunar surface, pick up samples of soil or rocks, do in situ chemical analysis and send the data to the mother-spacecraft Chandrayaan-II, which will be orbiting above. Chandrayaan-II will transmit the data to the ground. "We are trying to conceive an experiment in which the system will land on the lunar surface, move around and pick up samples, do their chemical analysis and transmit the data back to the ground."

On 2007-11-12 representatives of the Russian Federal Space Agency and ISRO signed an agreement for the two agencies to work together on the Chandrayaan-II project.

Chandrayaan-II will consist of the spacecraft itself and a landing platform with the moon rover. The platform with the rover will detach from the orbiter after the spacecraft reaches its orbit above the moon, and land on lunar soil. Then the rover will roll out of the platform. M. Annadurai, Project Director, Chandrayaan-I, said: "Chandrayaan-II will carry a semi-hard or soft-landing system. A motorised rover will be released on the moon's surface from the lander. The location for the lander will be identified using Chandrayaan-I data."

The rover will weigh between 30 kg and 100 kg, depending on whether it is to do a semi-hard landing or soft landing. The rover will have an operating life-span of a month. It will run predominantly on solar power.

If ISRO wants to operate the rover for two or three months, its engineers will configure the vehicle and its instruments including a battery back-up to go into a low-power mode, with the rover waking up when sunlight streams through. When the sunlight comes, the solar-powered battery cells will be re-charged and the equipment will be switched on one by one for the rover to function for another two weeks. "The batteries will be re-charged every two weeks," said Mr. Annadurai.

NANOTECHNOLOGY

Overview

Nanotechnology is a highly multidisciplinary field, drawing from fields such as applied physics, materials science, interface and colloid science, device physics, supramolecular chemistry (which refers to the area of chemistry that focuses on the noncovalent bonding interactions of molecules), self-replicating machines and robotics, chemical engineering, mechanical engineering, biological engineering, and electrical engineering. Grouping of the sciences under the umbrella of "nanotechnology" has been questioned on the basis that there is little actual boundary-crossing between the sciences that operate on the nano-scale. Instrumentation is the only area of technology common to all disciplines; on the contrary, for example pharmaceutical and semiconductor industries do not "talk with each other". Corporations that call their products "nanotechnology" typically market them only to a certain industrial cluster.

Two main approaches are used in nanotechnology. In the "bottom-up" approach, materials and devices are built from molecular components which assemble themselves chemically by principles of molecular recognition. In the "top-down" approach, nano-objects are constructed from larger entities without atomic-level control. The impetus for nanotechnology comes from a renewed interest in Interface and Colloid Science, coupled with a new generation of analytical tools such as the atomic force microscope (AFM), and the scanning tunneling microscope (STM). Combined with refined processes such as electron beam lithography and molecular beam epitaxy, these instruments allow the deliberate manipulation of nanostructures, and lead to the observation of novel phenomena.

Examples of nanotechnology are the manufacture of polymers based on molecular structure, and the design of computer chip layouts based on surface science. Despite the promise of nanotechnologies such as quantum dots and nanotubes, real commercial applications have mainly used the advantages of colloidal nanoparticles in bulk form, such as suntan lotion, cosmetics, protective coatings, drug delivery, and stain resistant clothing.

Origins

Buckminsterfullerene C60, also known as the buckyball, is the simplest of the carbon structures known as fullerenes. Members of the fullerene family are a major subject of research falling under the nanotechnology umbrella.
Buckminsterfullerene C60, also known as the buckyball, is the simplest of the carbon structures known as fullerenes. Members of the fullerene family are a major subject of research falling under the nanotechnology umbrella.

The first use of the concepts in 'nano-technology' (but predating use of that name) was in "There's Plenty of Room at the Bottom," a talk given by physicist Richard Feynman at an American Physical Society meeting at Caltech on December 29, 1959. Feynman described a process by which the ability to manipulate individual atoms and molecules might be developed, using one set of precise tools to build and operate another proportionally smaller set, so on down to the needed scale. In the course of this, he noted, scaling issues would arise from the changing magnitude of various physical phenomena: gravity would become less important, surface tension and Van der Waals attraction would become more important, etc. This basic idea appears plausible, and exponential assembly enhances it with parallelism to produce a useful quantity of end products. The term "nanotechnology" was defined by Tokyo Science University Professor Norio Taniguchi in a 1974 paper as follows: "'Nano-technology' mainly consists of the processing of, separation, consolidation, and deformation of materials by one atom or by one molecule." In the 1980s the basic idea of this definition was explored in much more depth by Dr. K. Eric Drexler, who promoted the technological significance of nano-scale phenomena and devices through speeches and the books Engines of Creation: The Coming Era of Nanotechnology (1986) and Nanosystems: Molecular Machinery, Manufacturing, and Computation,and so the term acquired its current sense. Engines of Creation: The Coming Era of Nanotechnology is considered the first book on the topic of nanotechnology. Nanotechnology and nanoscience got started in the early 1980s with two major developments; the birth of cluster science and the invention of the scanning tunneling microscope (STM). This development led to the discovery of fullerenes in 1986 and carbon nanotubes a few years later. In another development, the synthesis and properties of semiconductor nanocrystals was studied; This led to a fast increasing number of metal oxide nanoparticles of quantum dots. The atomic force microscope was invented six years after the STM was invented. In 2000, the United States National Nanotechnology Initiative was founded to coordinate Federal nanotechnology research and development.nano tecnology is the study of unicorns

Fundamental concepts

One nanometer (nm) is one billionth, or 10-9 of a meter. To put that scale in context, the comparative size of a nanometer to a meter is the same as that of a marble to the size of the earth. Or another way of putting it: a nanometer is the amount a man's beard grows in the time it takes him to raise the razor to his face.

Typical carbon-carbon bond lengths, or the spacing between these atoms in a molecule, are in the range 0.12-0.15 nm, and a DNA double-helix has a diameter around 2 nm. On the other hand, the smallest cellular lifeforms, the bacteria of the genus Mycoplasma, are around 200 nm in length.

Larger to smaller: a materials perspective

Image of reconstruction on a clean Au(100) surface, as visualized using scanning tunneling microscopy.  The positions of the individual atoms composing the surface are visible.
Image of reconstruction on a clean Au(100) surface, as visualized using scanning tunneling microscopy. The positions of the individual atoms composing the surface are visible.

A number of physical phenomena become pronounced as the size of the system decreases. These include statistical mechanical effects, as well as quantum mechanical effects, for example the “quantum size effect” where the electronic properties of solids are altered with great reductions in particle size. This effect does not come into play by going from macro to micro dimensions. However, it becomes dominant when the nanometer size range is reached. Additionally, a number of physical (mechanical, electrical, optical, etc.) properties change when compared to macroscopic systems. One example is the increase in surface area to volume ratio altering mechanical, thermal and catalytic properties of materials. Novel mechanical properties of nanosystems are of interest in the nanomechanics research. The catalytic activity of nanomaterials also opens potential risks in their interaction with biomaterials.

Materials reduced to the nanoscale can show different properties compared to what they exhibit on a macroscale, enabling unique applications. For instance, opaque substances become transparent (copper); inert materials become catalysts (platinum); stable materials turn combustible (aluminum); solids turn into liquids at room temperature (gold); insulators become conductors (silicon). A material such as gold, which is chemically inert at normal scales, can serve as a potent chemical catalyst at nanoscales. Much of the fascination with nanotechnology stems from these quantum and surface phenomena that matter exhibits at the nanoscale.

Simple to complex: a molecular perspective


Modern synthetic chemistry has reached the point where it is possible to prepare small molecules to almost any structure. These methods are used today to produce a wide variety of useful chemicals such as pharmaceuticals or commercial polymers. This ability raises the question of extending this kind of control to the next-larger level, seeking methods to assemble these single molecules into supramolecular assemblies consisting of many molecules arranged in a well defined manner.

These approaches utilize the concepts of molecular self-assembly and/or supramolecular chemistry to automatically arrange themselves into some useful conformation through a bottom-up approach. The concept of molecular recognition is especially important: molecules can be designed so that a specific conformation or arrangement is favored due to non-covalent intermolecular forces. The Watson-Crick basepairing rules are a direct result of this, as is the specificity of an enzyme being targeted to a single substrate, or the specific folding of the protein itself. Thus, two or more components can be designed to be complementary and mutually attractive so that they make a more complex and useful whole.

Such bottom-up approaches should be able to produce devices in parallel and much cheaper than top-down methods, but could potentially be overwhelmed as the size and complexity of the desired assembly increases. Most useful structures require complex and thermodynamically unlikely arrangements of atoms. Nevertheless, there are many examples of self-assembly based on molecular recognition in biology, most notably Watson-Crick basepairing and enzyme-substrate interactions. The challenge for nanotechnology is whether these principles can be used to engineer novel constructs in addition to natural ones.

Molecular nanotechnology: a long-term view


Molecular nanotechnology, sometimes called molecular manufacturing, is a term given to the concept of engineered nanosystems (nanoscale machines) operating on the molecular scale. It is especially associated with the concept of a molecular assembler, a machine that can produce a desired structure or device atom-by-atom using the principles of mechanosynthesis. Manufacturing in the context of productive nanosystems is not related to, and should be clearly distinguished from, the conventional technologies used to manufacture nanomaterials such as carbon nanotubes and nanoparticles.

When the term "nanotechnology" was independently coined and popularized by Eric Drexler (who at the time was unaware of an earlier usage by Norio Taniguchi) it referred to a future manufacturing technology based on molecular machine systems. The premise was that molecular-scale biological analogies of traditional machine components demonstrated molecular machines were possible: by the countless examples found in biology, it is known that sophisticated, stochastically optimised biological machines can be produced..

It is hoped that developments in nanotechnology will make possible their construction by some other means, perhaps using biomimetic principles. However, Drexler and other researchers have proposed that advanced nanotechnology, although perhaps initially implemented by biomimetic means, ultimately could be based on mechanical engineering principles, namely, a manufacturing technology based on the mechanical functionality of these components (such as gears, bearings, motors, and structural members) that would enable programmable, positional assembly to atomic specification (PNAS-1981). The physics and engineering performance of exemplar designs were analyzed in Drexler's book Nanosystems.

But Drexler's analysis is very qualitative and does not address very pressing issues, such as the "fat fingers" and "Sticky fingers" problems. In general it is very difficult to assemble devices on the atomic scale, as all one has to position atoms are other atoms of comparable size and stickyness. Another view, put forth by Carlo Montemagno, is that future nanosystems will be hybrids of silicon technology and biological molecular machines. Yet another view, put forward by the late Richard Smalley, is that mechanosynthesis is impossible due to the difficulties in mechanically manipulating individual molecules.

This led to an exchange of letters in the ACS publication Chemical & Engineering News in 2003. Though biology clearly demonstrates that molecular machine systems are possible, non-biological molecular machines are today only in their infancy. Leaders in research on non-biological molecular machines are Dr. Alex Zettl and his colleagues at Lawrence Berkeley Laboratories and UC Berkeley. They have constructed at least three distinct molecular devices whose motion is controlled from the desktop with changing voltage: a nanotube nanomotor, a molecular actuator, and a nanoelectromechanical relaxation oscillator.

An experiment indicating that positional molecular assembly is possible was performed by Ho and Lee at Cornell University in 1999. They used a scanning tunneling microscope to move an individual carbon monoxide molecule (CO) to an individual iron atom (Fe) sitting on a flat silver crystal, and chemically bound the CO to the Fe by applying a voltage.

Current research

Graphical representation of a rotaxane, useful as a molecular switch.
Graphical representation of a rotaxane, useful as a molecular switch.
This device transfers energy from nano-thin layers of quantum wells to nanocrystals above them, causing the nanocrystals to emit visible light.
This device transfers energy from nano-thin layers of quantum wells to nanocrystals above them, causing the nanocrystals to emit visible light.

Nanomaterials

This includes subfields which develop or study materials having unique properties arising from their nanoscale dimensions.

Bottom-up approaches

These seek to arrange smaller components into more complex assemblies.

Top-down approaches

These seek to create smaller devices by using larger ones to direct their assembly.

Functional approaches

These seek to develop components of a desired functionality without regard to how they might be assembled.

Speculative

These subfields seek to anticipate what inventions nanotechnology might yield, or attempt to propose an agenda along which inquiry might progress. These often take a big-picture view of nanotechnology, with more emphasis on its societal implications than the details of how such inventions could actually be created.

  • Molecular nanotechnology is a proposed approach which involves manipulating single molecules in finely controlled, deterministic ways. This is more theoretical than the other subfields and is beyond current capabilities.
  • Nanorobotics centers on self-sufficient machines of some functionality operating at the nanoscale. There are hopes for applying nanorobots in medicine, but it may not be easy to do such a thing because of several drawbacks of such devices. Nevertheless, progress on innovative materials and methodologies has been demonstrated with some patents granted about new nanomanufacturing devices for future commercial applications, which also progressively helps in the development towards nanorobots with the use of embedded nanobioelectronics concept.
  • Programmable matter based on artificial atoms seeks to design materials whose properties can be easily and reversibly externally controlled.
  • Due to the popularity and media exposure of the term nanotechnology, the words picotechnology and femtotechnology have been coined in analogy to it, although these are only used rarely and informally.

Tools and techniques

Typical AFM setup. A microfabricated cantilever with a sharp tip is deflected by features on a sample surface, much like in a phonograph but on a much smaller scale. A laser beam reflects off the backside of the cantilever into a set of photodetectors, allowing the deflection to be measured and assembled into an image of the surface.
Typical AFM setup. A microfabricated cantilever with a sharp tip is deflected by features on a sample surface, much like in a phonograph but on a much smaller scale. A laser beam reflects off the backside of the cantilever into a set of photodetectors, allowing the deflection to be measured and assembled into an image of the surface.

The first observations and size measurements of nano-particles were made during the first decade of the 20th century. They are mostly associated with the name of Zsigmondy who made detailed studies of gold sols and other nanomaterials with sizes down to 10 nm and less. He published a book in 1914. He used ultramicroscope that employs a dark field method for seeing particles with sizes much less than light wavelength.

There are traditional techniques developed during 20th century in Interface and Colloid Science for characterizing nanomaterials. These are widely used for first generation passive nanomaterials specified in the next section.

These methods include several different techniques for characterizing particle size distribution. This characterization is imperative because many materials that are expected to be nano-sized are actually aggregated in solutions. Some of methods are based on light scattering. Other apply ultrasound, such as ultrasound attenuation spectroscopy for testing concentrated nano-dispersions and microemulsions.

There is also a group of traditional techniques for characterizing surface charge or zeta potential of nano-particles in solutions. These information is required for proper system stabilzation, preventing its aggregation or flocculation. These methods include microelectrophoresis, electrophoretic light scattering and electroacoustics. The last one, for instance colloid vibration current method is suitable for characterizing concentrated systems.

Next group of nanotechnological techniques include those used for fabrication of nanowires, those used in semiconductor fabrication such as deep ultraviolet lithography, electron beam lithography, focused ion beam machining, nanoimprint lithography, atomic layer deposition, and molecular vapor deposition, and further including molecular self-assembly techniques such as those employing di-block copolymers. However, all of these techniques preceded the nanotech era, and are extensions in the development of scientific advancements rather than techniques which were devised with the sole purpose of creating nanotechnology and which were results of nanotechnology research.

There are several important modern developments. The atomic force microscope (AFM) and the Scanning Tunneling Microscope (STM) are two early versions of scanning probes that launched nanotechnology. There are other types of scanning probe microscopy, all flowing from the ideas of the scanning confocal microscope developed by Marvin Minsky in 1961 and the scanning acoustic microscope (SAM) developed by Calvin Quate and coworkers in the 1970s, that made it possible to see structures at the nanoscale. The tip of a scanning probe can also be used to manipulate nanostructures (a process called positional assembly). Feature-oriented scanning-positioning methodology suggested by Rostislav Lapshin appears to be a promising way to implement these nanomanipulations in automatic mode. However, this is still a slow process because of low scanning velocity of the microscope. Various techniques of nanolithography such as dip pen nanolithography, electron beam lithography or nanoimprint lithography were also developed. Lithography is a top-down fabrication technique where a bulk material is reduced in size to nanoscale pattern.

The top-down approach anticipates nanodevices that must be built piece by piece in stages, much as manufactured items are made. Scanning probe microscopy is an important technique both for characterization and synthesis of nanomaterials. Atomic force microscopes and scanning tunneling microscopes can be used to look at surfaces and to move atoms around. By designing different tips for these microscopes, they can be used for carving out structures on surfaces and to help guide self-assembling structures. By using, for example, feature-oriented scanning-positioning approach, atoms can be moved around on a surface with scanning probe microscopy techniques. At present, it is expensive and time-consuming for mass production but very suitable for laboratory experimentation.

In contrast, bottom-up techniques build or grow larger structures atom by atom or molecule by molecule. These techniques include chemical synthesis, self-assembly and positional assembly. Another variation of the bottom-up approach is molecular beam epitaxy or MBE. Researchers at Bell Telephone Laboratories like John R. Arthur. Alfred Y. Cho, and Art C. Gossard developed and implemented MBE as a research tool in the late 1960s and 1970s. Samples made by MBE were key to the discovery of the fractional quantum Hall effect for which the 1998 Nobel Prize in Physics was awarded. MBE allows scientists to lay down atomically-precise layers of atoms and, in the process, build up complex structures. Important for research on semiconductors, MBE is also widely used to make samples and devices for the newly emerging field of spintronics.

Newer techniques such as Dual Polarisation Interferometry are enabling scientists to measure quantitatively the molecular interactions that take place at the nano-scale.

Applications


As of April 24, 2008 The Project on Emerging Nanotechnologies claims that over 609 nanotech products exist, with new ones hitting the market at a pace of 3-4 per week. The project lists all of the products in a database. Most applications are limited to the use of "first generation" passive nanomaterials which includes titanium dioxide in sunscreen, cosmetics and some food products; Carbon allotropes used to produce gecko tape; silver in food packaging, clothing, disinfectants and household appliances; zinc oxide in sunscreens and cosmetics, surface coatings, paints and outdoor furniture varnishes; and cerium oxide as a fuel catalyst.

The National Science Foundation (a major source of funding for nanotechnology in the United States) funded researcher David Berube to study the field of nanotechnology. His findings are published in the monograph “Nano-Hype: The Truth Behind the Nanotechnology Buzz". This published study (with a foreword by Mihail Roco, Senior Advisor for Nanotechnology at the National Science Foundation) concludes that much of what is sold as “nanotechnology” is in fact a recasting of straightforward materials science, which is leading to a “nanotech industry built solely on selling nanotubes, nanowires, and the like” which will “end up with a few suppliers selling low margin products in huge volumes." Further applications which require actual manipulation or arrangement of nanoscale components await further research. Though technologies branded with the term 'nano' are sometimes little related to and fall far short of the most ambitious and transformative technological goals of the sort in molecular manufacturing proposals, the term still connotes such ideas. Thus there may be a danger that a "nano bubble" will form, or is forming already, from the use of the term by scientists and entrepreneurs to garner funding, regardless of interest in the transformative possibilities of more ambitious and far-sighted work.

Platinum nanoparticles are now being considered in the next generation of automotive catalytic converters because the very high surface area of nanoparticles could reduce the amount of platinum required. However, some concerns have been raised due to experiments demonstrating that they will spontaneously combust if methane is mixed with the ambient air. Ongoing research at the Centre National de la Recherche Scientifique(CNRS) in France may resolve their true usefulness for catalytic applications. Nanofiltration may come to be an important application, although future research must be careful to investigate possible toxicity.

In 1999, the ultimate CMOS transistor developed at the Laboratory for Electronics and Information Technology in Grenoble, France, tested the limits of the principles of the MOSFET transistor with a diameter of 18 nm (approximately 70 atoms placed side by side). This was almost one tenth the size of the smallest industrial transistor in 2003 (130 nm in 2003, 90 nm in 2004, 65 nm in 2005 and 45 nm in 2007). It enabled the theoretical integration of seven billion junctions on a €1 coin. However, the CMOS transistor, which was created in 1999, was not a simple research experiment to study how CMOS technology functions, but rather a demonstration of how this technology functions now that we ourselves are getting ever closer to working on a molecular scale. Today it would be impossible to master the coordinated assembly of a large number of these transistors on a circuit and it would also be impossible to create this on an industrial level

Sunday, June 15, 2008

SARDAR Vallabhbhai Patel a brief story

Early life

Young Vallabhbhai, when a student.
Young Vallabhbhai, when a student.

Vallabhbhai Jhaverbhai Patel was born at his maternal uncle's house in Nadiad, Gujarat. His actual date of birth was never officially recorded—Patel entered 31 October as his date of birth on his matriculation examination papers. He was the fourth son of Jhaverbhai a Hindu by religion and his wife Ladba Patel. They lived in the village of Karamsad, in the Kheda district where Jhaverbhai owned a homestead. Somabhai, Narsibhai and Vithalbhai Patel (also a future political leader) were his elder brothers. He had a younger brother, Kashibhai and a sister, Dahiba. As a young boy, Patel helped his father in the fields and bimonthly kept a day-long fast, abstaining from food and water—a Hindu cultural observance that enabled him to develop physical toughness. When he was eighteen years old, Patel's marriage was arranged with Jhaverba, a young girl of twelve or thirteen years from a nearby village. As per custom, the young bride would continue to reside with her parents until her husband started earning and could establish their household.

Patel travelled to attend schools in Nadiad, Petlad and Borsad, living self-sufficiently with other boys. He reputedly cultivated a stoic character—a popular anecdote recounts how he lanced his own painful boil without hesitation, even as the barber supposed to do it trembled. Patel passed his matriculation at the late age of 22; at this point, he was generally regarded by his elders as an unambitious man destined for a commonplace job. But Patel himself harboured a plan—he would study to become a lawyer, work and save funds, travel to England and study to become a barrister. Patel spent years away from his family, studying on his own with books borrowed from other lawyers and passed examinations within two years. Fetching Jhaverba from her parents' home, Patel set up his household in Godhra and enrolled at the bar. During the many years it took him to save money, Vallabhbhai—now a pleader—earned a reputation as a fierce and skilled lawyer. His wife bore him a daughter, Manibehn, in 1904 and later a son, Dahyabhai, in 1906. Patel also cared for a friend suffering from Bubonic plague when it swept across Gujarat. When Patel himself came down with the disease, he immediately sent his family to safety, left his home and moved into an isolated house in Nadiad (by other accounts, Patel spent this time in a dilapidated temple); there, he recovered slowly.

Vallabhbhai Patel, when a young lawyer.
Vallabhbhai Patel, when a young lawyer.

Patel practised law in Godhra, Borsad and Anand while taking on the financial burdens of his homestead in Karamsad. When he had saved enough for England and applied for a pass and a ticket, they arrived in the name of "V. J. Patel," at Vithalbhai's home, who bore the same initials. Having harboured his own plans to study in England, Vithalbhai remonstrated to his younger brother that it would be disreputable for an older brother to follow his younger brother. In keeping with concerns for his family's honour, Patel allowed Vithalbhai to go in his place. He also financed his brother's stay and began saving again for his own goals.

In 1909, Patel's wife Jhaverba was hospitalised in Mumbai (then Bombay) to undergo a major surgical operation for cancer. Her health suddenly worsened and despite successful emergency surgery, she died in the hospital. Patel was given a note informing him of his wife's demise as he was cross-examining a witness in court. As per others who witnessed, Patel read the note, pocketed it and continued to intensely cross-examine the witness and won the case. He broke the news to others only after the proceedings had ended. Patel himself decided against marrying again. He raised his children with the help of his family and sent them to English-medium schools in Mumbai. At the age of 36, he journeyed to England and enrolled at the Middle Temple Inn in London. Finishing a 36-month course in 30 months, Patel topped his class despite having no previous college background. Returning to India, Patel settled in the city of Ahmedabad and became one of the city's most successful barristers. Wearing European-style clothes and urbane mannerisms, he also became a skilled bridge player. Patel nurtured ambitions to expand his practise and accumulate great wealth and to provide his children with modern education. He had also made a pact with his brother Vithalbhai to support his entry into politics in the Bombay Presidency, while Patel himself would remain in Ahmedabad and provide for the family.

Fighting for independence

Vallabhbhai Patel at the height of his success as a lawyer
Vallabhbhai Patel at the height of his success as a lawyer
See also: Indian independence movement and Mahatma Gandhi

At the urging of his friends, Patel won an election to become the sanitation commissioner of Ahmedabad in 1917. While often clashing with British officials on civic issues, he did not show any interest in politics. Upon hearing of Mohandas Gandhi, he joked to Mavlankar that Gandhi would "ask you if you know how to sift pebbles from wheat. And that is supposed to bring independence." But Patel was deeply impressed when Gandhi defied the British in Champaran for the sake of the area's oppressed farmers. Against the grain of Indian politicians of the time, Gandhi wore Indian-style clothes and emphasised the use of one's mother tongue or any Indian language as opposed to English—the lingua franca of India's intellectuals. Patel was particularly attracted to Gandhi's inclination to action—apart from a resolution condemning the arrest of political leader Annie Besant, Gandhi proposed that volunteers march peacefully demanding to meet her.

Patel gave a speech in Borsad in September 1917, encouraging Indians nationwide to sign Gandhi's petition demanding Swaraj—independence—from the British. Meeting Gandhi a month later at the Gujarat Political Conference in Godhra, Patel became the secretary of the Gujarat Sabha—a public body which would become the Gujarati arm of the Indian National Congress—at Gandhi's encouragement. Patel now energetically fought against veth—the forced servitude of Indians to Europeans—and organised relief efforts in wake of plague and famine in Kheda. The Kheda peasants' plea for exemption from taxation had been turned down by British authorities. Gandhi endorsed waging a struggle there, but could not lead it himself due to his activities in Champaran. When Gandhi asked for a Gujarati activist to devote himself completely to the assignment and Patel volunteered, much to Gandhi's personal delight.Though his decision was made on the spot, Patel later said that his desire and commitment came after intensive personal contemplation, as he realised he would have to abandon his career and material ambitions.

Satyagraha in Gujarat


Vallabhbhai Patel, after his embrace of Gandhi's philosophy and a completely Indian way of life
Vallabhbhai Patel, after his embrace of Gandhi's philosophy and a completely Indian way of life

Supported by Congress volunteers Narhari Parikh, Mohanlal Pandya and Abbas Tyabji, Vallabhbhai Patel began a village-to-village tour in the Kheda district, documenting grievances and asking villagers for their support for a statewide revolt by refusing the payment of taxes. Patel emphasised potential hardships with the need for complete unity and non-violence despite any provocation. He received enthusiastic responses from virtually every village. When the revolt was launched and revenue refused, the government sent police and intimidation squads to seize property, including confiscating barn animals and whole farms. Patel organised a network of volunteers to work with individual villages—helping them hide valuables and protect themselves during raids. Thousands of activists and farmers were arrested, but Patel was not. The revolt began evoking sympathy and admiration across India, including with pro-British Indian politicians. The government agreed to negotiate with Patel and decided to suspend the payment of revenue for the year, even scaling back the rate. Patel emerged as a hero to Gujaratis and admired across India. In 1920, he was elected president of the newly formed Gujarat Pradesh Congress Committee—he would serve as its president till 1945.

Patel supported Gandhi's Non-cooperation movement and toured the state to recruit more than 300,000 members and raise over Rs. 1.5 million in funds. Helping organise bonfires of British goods in Ahmedabad, Patel threw in all his English-style clothes. With his daughter Mani and son Dahya, he switched completely to wearing khadi. Patel also supported Gandhi's controversial suspension of resistance in wake of the Chauri Chaura incident. He worked extensively in the following years in Gujarat against alcoholism, untouchability and caste discrimination, as well as for the empowerment of women. In the Congress, he was a resolute supporter of Gandhi against his Swarajist critics. Patel was elected Ahmedabad's municipal president in 1922, 1924 and 1927—during his terms, Ahmedabad was extended a major supply of electricity and the school system underwent major reforms. Drainage and sanitation systems were extended over all the city. He fought for the recognition and payment of teachers employed in schools established by nationalists (out of British control) and even took on sensitive Hindu-Muslim Issues. Sardar Patel personally led relief efforts in the aftermath of the intense torrential rainfall in 1927, which had caused major floods in the city and in the Kheda district and great destruction of life and property. He established refuge centres across the district, raised volunteers, arranged for supply of food, medicines and clothing, as well as emergency funds from the government and public.

Patel with Bardoli peasants.
Patel with Bardoli peasants.

When Gandhi was in prison, Sardar Patel was asked by Congressmen to lead the satyagraha in Nagpur in 1923 against a law banning the raising of the Indian flag. He organised thousands of volunteers from all over the country in processions hoisting the flag. Patel negotiated a settlement that obtained the release of all prisoners and allowed nationalists to hoist the flag in public. Later that year, Patel and his allies uncovered evidence suggesting that the police were in league with local dacoits in the Borsad taluka even as the government prepared to levy a major tax for fighting dacoits in the area. More than 6,000 villagers assembled to hear Patel speak and supported the proposed agitation against the tax, which was deemed immoral and unnecessary. He organised hundreds of Congressmen, sent instructions and received information from across the district. Every village in the taluka resisted payment of the tax, and through cohesion, also prevented the seizure of property and lands. After a protracted struggle, the government withdrew the tax. Historians believe that one of Patel's key achievements was the building of cohesion and trust amongst the different castes and communities, which were divided on socio-economic lines.

In April 1928, Sardar Patel returned to the freedom struggle from his municipal duties in Ahmedabad when Bardoli suffered from a serious predicament of a famine and steep tax hike. The revenue hike was steeper than it had been in Kheda even though the famine covered a large portion of Gujarat. After cross-examining and talking to village representatives, emphasizing the potential hardship and need for non-violence and cohesion, Patel initiated the struggle—complete denial of taxes. Sardar Patel organised volunteers, camps and an information network across affected areas. The revenue refusal was stronger than in Kheda and many sympathy satyagrahas were undertaken across Gujarat. Despite arrests, seizures of property and lands, the struggle intensified. The situation reached a head in August, when through sympathetic intermediaries, he negotiated a settlement repealing the tax hike, reinstating village officials who had resigned in protest and the return of seized property and lands. It was during the struggle and after the victory in Bardoli that Patel was increasingly addressed by his colleagues and followers as Sardar.

Leading the Congress

Maulana Azad, Sardar Patel (third from left, in the foreground), and other Congressmen at Wardha
Maulana Azad, Sardar Patel (third from left, in the foreground), and other Congressmen at Wardha

As Gandhi embarked on the Dandi Salt March, Patel was arrested in the village of Ras and tried without witnesses, with no lawyer or pressman allowed to attend. Patel's arrest and Gandhi's subsequent arrest caused the Salt Satyagraha to greatly intensify in Gujarat—districts across Gujarat launched an anti-tax rebellion until and unless Patel and Gandhi were released. Once released, Patel served as interim Congress president, but was re-arrested while leading a procession in Mumbai. After the signing of the Gandhi-Irwin Pact, Patel was elected Congress president for its 1931 session in Karachi—here the Congress ratified the pact, committed itself to the defence of fundamental rights and human freedoms, and a vision of a secular nation, minimum wage and the abolition of untouchability and serfdom. Patel used his position as Congress president in organising the return of confiscated lands to farmers in Gujarat. Upon the failure of the Round Table Conference in London, Gandhi and Patel were arrested in January 1932 when the struggle re-opened, and imprisoned in the Yeravda Central Jail. During this term of imprisonment, Patel and Gandhi grew close to each other, and the two developed a close bond of affection, trust, and frankness. Their mutual relationship could be described as that of an elder brother (Gandhi) and his younger brother (Patel). Despite having arguments with Gandhi, Patel respected his instincts and leadership. During imprisonment, the two would discuss national and social issues, read Hindu epics and crack jokes. Gandhi also taught Patel Sanskrit language. Gandhi's secretary Mahadev Desai kept detailed records of conversations between Gandhi and Patel.When Gandhi embarked on a fast-unto-death protesting the separate electorates allocated for untouchables, Patel looked after Gandhi closely and himself refrained from partaking of food.[ Patel was later moved to a jail in Nasik, and refused a British offer for a brief release to attend the cremation of his brother Vithalbhai, who had died in 1934. He was finally released in July of the same year.

Patel headed Congress's all-India election campaign in 1934 and 1937—he would collect funds, select candidates, determine the Congress stance on issues and opponents. Not contesting a seat for himself, Patel nevertheless guided Congressmen elected in the provinces and at the national level. In 1935, Patel underwent surgery for hemorrhoids, yet guided efforts against plague in Bardoli and again when a drought struck Gujarat in 1939. Patel would guide the Congress ministries that had won power across India with the aim of preserving party discipline—Patel feared that the British would use opportunities to create conflicts among elected Congressmen, and he did not want the party to be distracted from the goal of complete independence. But Patel would clash with Nehru, opposing declarations of the adoption of socialism at the 1936 Congress session, which he believed was a diversion from the main goal of achieving independence. In 1938, Patel organized rank and file opposition to the attempts of then-Congress president Subhash Bose to move away from Gandhi's principles of non-violent resistance. Patel considered Bose to be authoritarian and desirous of more power over the party. He led senior Congress leaders in a protest, which resulted in Bose's resignation. But criticism arose from Bose's supporters, socialists and other Congressmen that Patel himself was acting in an authoritarian manner in his defense of Gandhi's authority.

Quit India

When World War II broke out, Patel supported Nehru's decision to withdraw the Congress from central and provincial legislatures, contrary to Gandhi's advice, as well as an initiative by senior leader Chakravarthi Rajagopalachari to offer Congress's full support to Britain if it promised Indian independence at the end of the war and install a democratic government right away. Gandhi had refused to support Britain on the grounds of his moral opposition to war, while Subhash Chandra Bose was in militant opposition to the British. The British rejected Rajagopalachari's initiative, and Patel embraced Gandhi's leadership again. He participated in Gandhi's call for individual disobedience, and was arrested in 1940 and imprisoned for nine months. He also opposed the proposals of the Cripps' mission in 1942. Patel lost more than twenty pounds during his period in jail.

Azad, Patel and Gandhi at an AICC meeting in Bombay, 1940.
Azad, Patel and Gandhi at an AICC meeting in Bombay, 1940.

While Nehru, Rajagopalachari and Maulana Azad initially criticized Gandhi's proposal for an all-out campaign of civil disobedience to force the British to Quit India, Patel was its most fervent supporter. Arguing that the British would retreat from India as they had from Singapore and Burma, Patel stressed that the campaign start without any delay. Though feeling that the British would not quit immediately, Patel favored an all-out rebellion which would galvanize Indian people, who had been divided in their response to the war, In Patel's view, an all-out rebellion would force the British to concede that continuation of colonial rule had no support in India, and thus speed power transfer to Indians.Believing strongly in the need for revolt, Patel stated his intention to resign from the Congress if the revolt was not approved. Gandhi strongly pressured the All India Congress Committee to approve of an all-out campaign of civil disobedience, and the AICC approved the campaign on 7 August 1942. Though Patel's health had suffered during his stint in jail, Patel gave emotional speeches to large crowds across India, . asking people to refuse paying taxes and participate in civil disobedience, mass protests and a shutdown of all civil services. He raised funds and prepared a second-tier of command as a precaution against the arrest of national leaders. Patel made a climactic speech to more than 100,000 people gathered at Gowalia Tank in Bombay (Mumbai) on August 7:

"The Governor of Burma boasts in London that they left Burma only after reducing everything to dust. So you promise the same thing to India?... You refer in your radio broadcasts and newspapers to the government established in Burma by Japan as a puppet government? What sort of government do you have in Delhi now?...When France fell before the Nazi onslaught, in the midst of total war, Mr. Churchill offered union with England to the French. That was indeed a stroke of inspired statesmanship. But when it comes to India? Oh no! Constitutional changes in the midst of a war? Absolutely unthinkable...The object this time is to free India before the Japanese can come and be ready to fight them if they come. They will round up the leaders, round up all. Then it will be the duty of every Indian to put forth his utmost effort—within non-violence. No source is to be left untapped; no weapon untried. This is going to be the opportunity of a lifetime."

Historians believe that Patel's speech was instrumental in electrifying nationalists, who had been skeptical of the proposed rebellion. Patel's organising work in this period is credited by historians for ensuring the success of the rebellion across India. Patel was arrested on 9 August and was imprisoned with the entire Congress Working Committee from 1942 to 1945 at the fort in Ahmednagar. Here he spun cloth, played bridge, read a large number of books, took long walks, practised gardening. He also provided emotional support to his colleagues while awaiting news and developments of the outside. Patel was deeply pained at the news of the deaths of Mahadev Desai and Kasturba Gandhi later in the year. But Patel wrote in a letter to his daughter that he and his colleagues were experiencing "fullest peace" for having done "their duty." Even though other political parties had opposed the struggle and the British had employed ruthless means of suppression, the Quit India movement was "by far the most serious rebellion since that of 1857," as the viceroy cabled to Winston Churchill. More than one hundred thousand people were arrested and thousands killed in police firings. Strikes, protests and other revolutionary activities had broken out across India. When Patel was released on 15 June 1945 he realised that the British were preparing proposals to transfer power to Indian hands.

Independence, integration and Role of Gandhi

In the 1946 election for the Congress presidency, Patel stepped down in favor of Nehru at the request of Gandhi. The election's importance stemmed from the fact that the elected President would lead free India's first Government. Gandhi asked all 16 states representatives and Congress to elect the right person and Sardar Patel's name was proposed by 13 states representatives out of 16, but Patel respected Gandhi's request to not be the first prime minister. As a Home Minister, Patel merged all parts of India under federal control but Jammu and Kashmir was left out because of Nehru.

After the election of Nehru as the party's president, Patel began directing the Congress campaign for the general elections of the Constituent Assembly of India.

Gandhi (right), Patel (left), and Nehru (back)
Gandhi (right), Patel (left), and Nehru (back)

In the elections, the Congress won a large majority of the elected seats, dominating the Hindu electorate. But the Muslim League led by Muhammad Ali Jinnah won a large majority of Muslim electorate seats. The League had resolved in 1940 to demand Pakistan—an independent state for Muslims—and was a fierce critic of the Congress. The Congress formed governments in all provinces save Sindh, Punjab and Bengal, where it entered into coalitions with other parties.

Cabinet mission and partition

When the British mission proposed two plans for transfer of power, there was considerable opposition within the Congress to both. The plan of 16 May 1946 proposed a loose federation with extensive provincial autonomy, and the "grouping" of provinces based on religious-majority. The plan of 16 June 1946 proposed the partition of India on religious lines, with over 600 princely states free to choose between independence or accession to either dominion. The League approved both plans, while the Congress flatly rejected the June 16 proposal. Gandhi criticised the May 16 proposal as being inherently divisive, but Patel, realizing that rejecting the proposal would mean that only the League would be invited to form a government, lobbied the Congress Working Committee hard to give its assent to the 16 May proposal. Patel engaged the British envoys Sir Stafford Cripps and Lord Pethick-Lawrence and obtained an assurance that the "grouping" clause would not be given practical force, Patel converted Nehru, Rajendra Prasad and Rajagopalachari to accept the plan. When the League retracted its approval of the 16 May plan, the viceroy Lord Wavell invited the Congress to form the government. Under Nehru, who was styled the "Vice President of the Viceroy's Executive Council," Patel took charge of the departments of home affairs and information and broadcasting. He moved into a government house on 1, Aurangzeb Road in Delhi—this would be his residence till his death in 1950.

Vallabhbhai Patel was one of the first Congress leaders to accept the partition of India as a solution to the rising Muslim separatist movement led by Muhammad Ali Jinnah. He had been outraged by Jinnah's Direct Action campaign, which had provoked communal violence across India and by the viceroy's vetoes of his home department's plans to stop the violence on the grounds of constitutionality. Patel severely criticised the viceroy's induction of League ministers into the government, and the revalidation of the grouping scheme by the British without Congress approval. Although further outraged at the League's boycott of the assembly and non-acceptance of the plan of 16 May despite entering government, he was also aware that Jinnah did enjoy popular support amongst Muslims, and that an open conflict between him and the nationalists could degenerate into a Hindu-Muslim civil war of disastrous consequences. The continuation of a divided and weak central government would in Patel's mind, result in the wider fragmentation of India by encouraging more than 600 princely states towards independence. Between the months of December 1946 and January 1947, Patel worked with civil servant V. P. Menon on the latter's suggestion for a separate dominion of Pakistan created out of Muslim-majority provinces. Communal violence in Bengal and Punjab in January and March of 1947 further convinced Patel of the soundness of partition. Patel, a fierce critic of Jinnah's demand that the Hindu-majority areas of Punjab and Bengal be included in a Muslim state, obtained the partition of those provinces, thus blocking any possibility of their inclusion in Pakistan. Patel's decisiveness on the partition of Punjab and Bengal had won him many supporters and admirers amongst the Indian public, which had tired of the League's tactics, but he was criticised by Gandhi, Nehru, secular Muslims and socialists for a perceived eagerness to do so. When Lord Louis Mountbatten formally proposed the plan on 3 June 1947, Patel gave his approval and lobbied Nehru and other Congress leaders to accept the proposal. Knowing Gandhi's deep anguish regarding proposals of partition, Patel engaged him in frank discussion in private meetings over the perceived practical unworkability of any Congress-League coalition, the rising violence and the threat of civil war. At the All India Congress Committee meeting called to vote on the proposal, Patel said:

“ I fully appreciate the fears of our brothers from [the Muslim-majority areas]. Nobody likes the division of India and my heart is heavy. But the choice is between one division and many divisions. We must face facts. We cannot give way to emotionalism and sentimentality. The Working Committee has not acted out of fear. But I am afraid of one thing, that all our toil and hard work of these many years might go waste or prove unfruitful. My nine months in office has completely disillusioned me regarding the supposed merits of the Cabinet Mission Plan. Except for a few honourable exceptions, Muslim officials from the top down to the chaprasis (peons or servants) are working for the League. The communal veto given to the League in the Mission Plan would have blocked India's progress at every stage. Whether we like it or not, de facto Pakistan already exists in the Punjab and Bengal. Under the circumstances I would prefer a de jure Pakistan, which may make the League more responsible. Freedom is coming. We have 75 to 80 percent of India, which we can make strong with our own genius. The League can develop the rest of the country. ”

Following Gandhi's and Congress' approval of the plan, Patel represented India on the Partition Council, where he oversaw the division of public assets, and selected the Indian council of ministers with Nehru. However, neither he nor any other Indian leader had foreseen the intense violence and population transfer that would take place with partition. Patel would take the lead in organising relief and emergency supplies, establishing refugee camps and visiting the border areas with Pakistani leaders to encourage peace. Despite these efforts, estimates on the death toll vary from around two hundred thousand, to over a million people. The estimated number of refugees in both countries exceeds 15 million. Understanding that Delhi and Punjab policemen, accused of organising attacks on Muslims, were personally affected by the tragedies of partition, Patel called out the Indian Army with South Indian regiments to restore order, imposing strict curfews and shoot-at-sight orders. Visiting the Nizamuddin Auliya Dargah area in Delhi, where thousands of Delhi Muslims feared attacks, he prayed at the shrine, visited the people and reinforced the presence of police. He suppressed from the press reports of atrocities in Pakistan against Hindus and Sikhs to prevent retaliatory violence. Establishing the Delhi Emergency Committee to restore order and organising relief efforts for refugees in the capital, Patel publicly warned officials against partiality and neglect. When reports reached Patel that large groups of Sikhs were preparing to attack Muslim convoys heading for Pakistan, Patel hurried to Amritsar and met Sikh and Hindu leaders. Arguing that attacking helpless people was cowardly and dishonourable, Patel emphasised that Sikh actions would result in further attacks against Hindus and Sikhs in Pakistan. He assured the community leaders that if they worked to establish peace and order and guarantee the safety of Muslims, the Indian government would react forcefully to any failures of Pakistan to do the same. Additionally, Patel addressed a massive crowd of an estimated 200,000 refugees who had surrounded his car after the meetings:

“ Here, in this same city, the blood of Hindus, Sikhs and Muslims mingled in the bloodbath of Jallianwala Bagh. I am grieved to think that things have come to such a pass that no Muslim can go about in Amritsar and no Hindu or Sikh can even think of living in Lahore. The butchery of innocent and defenceless men, women and children does not behove brave men... I am quite certain that India's interest lies in getting all her men and women across the border and sending out all Muslims from East Punjab. I have come to you with a specific appeal. Pledge the safety of Muslim refugees crossing the city. Any obstacles or hindrances will only worsen the plight of our refugees who are already performing prodigious feats of endurance. If we have to fight, we must fight clean. Such a fight must await an appropriate time and conditions and you must be watchful in choosing your ground. To fight against the refugees is no fight at all. No laws of humanity or war among honourable men permit the murder of people who have sought shelter and protection. Let there be truce for three months in which both sides can exchange their refugees. This sort of truce is permitted even by laws of war. Let us take the initiative in breaking this vicious circle of attacks and counter-attacks. Hold your hands for a week and see what happens. Make way for the refugees with your own force of volunteers and let them deliver the refugees safely at our frontier. ”

Following his dialogue with community leaders and his speech, no further attacks occurred against Muslim refugees, and a wider peace and order was re-established soon over the entire area. However, Patel was criticised by Nehru, secular Muslims and taxed by Gandhi over his alleged wish to see Muslims from other parts of India depart. While Patel vehemently denied such allegations, the acrimony with Maulana Azad and other secular Muslim leaders increased when Patel refused to dismiss Delhi's Sikh police commissioner, who was accused of discrimination. Hindu and Sikh leaders also accused Patel and other leaders of not taking Pakistan sufficiently to task over the attacks on their communities there, and Muslim leaders further criticised him for allegedly neglecting the needs of Muslims leaving for Pakistan, and concentrating resources for incoming Hindu and Sikh refugees. Patel clashed with Nehru and Azad over the allocation of houses in Delhi vacated by Muslims leaving for Pakistan—Nehru and Azad desired to allocate them for displaced Muslims, while Patel argued that no government professing secularism must make such exclusions. However, Patel was publicly defended by Gandhi and received widespread admiration and support for speaking frankly on communal issues and acting decisively and resourcefully to quell disorder and violence.

Political integration of India

Under the June 3 plan, more than 600 princely states were given the option of joining either India or Pakistan, or choosing independence. Indian nationalists and large segments of the public feared that if these states did not accede, a vast majority of the people and territory would be fragmented. The Congress as well as senior British officials considered Patel the best man for the task of achieving unification of the princely states with the Indian dominion. Gandhi had said to Patel "the problem of the States is so difficult that you alone can solve it".He was considered a statesman of integrity with the practical acumen and resolve to accomplish a monumental task. Patel asked V. P. Menon, a senior civil servant with whom he had worked over the partition of India, to become his right-hand as chief secretary of the States Ministry. On 6 May 1947, Patel began lobbying the princes, attempting to make them receptive towards dialogue with the future Government and trying to forestall potential conflicts. Patel used social meetings and unofficial surroundings to engage most monarchs, inviting them to lunch and tea at his home in Delhi. At these meetings, Patel stated that there was no inherent conflict between the Congress and the princely order. Nonetheless, he stressed that the princes would need to accede to India in good faith by 15 August 1947. Patel invoked the patriotism of India's monarchs, asking them to join in the freedom of their nation and act as responsible rulers who cared about the future of their people. He persuaded the princes of 565 states of the impossibility of independence from the Indian republic, especially in the presence of growing opposition from their subjects. He proposed favourable terms for the merger, including creation of privy purses for the descendants of the rulers. While encouraging the rulers to act with patriotism, Patel did not rule out force, setting a deadline of 15 August 1947 for them to sign the instrument of accession document. All but three of the states willingly merged into the Indian union—only Jammu and Kashmir, Junagadh, and Hyderabad did not fall into his basket.

Hyderabad state in 1909. Its area stretches over the present Indian states of Andhra Pradesh, Karnataka, Maharashtra.
Hyderabad state in 1909. Its area stretches over the present Indian states of Andhra Pradesh, Karnataka, Maharashtra.

Junagadh was especially important to Patel, since it was in his home state of Gujarat. The Nawab had under pressure from Sir Shah Nawaz Bhutto acceded to Pakistan. It was however, quite far from Pakistan and 80% of its population was Hindu. Patel combined diplomacy with force, demanding that Pakistan annul the accession, and that the Nawab accede to India. He sent the Army to occupy three principalities of Junagadh to show his resolve. Following widespread protests and the formation of a civil government, or Aarzi Hukumat, both Bhutto and the Nawab fled to Karachi, and under Patel's orders, Indian Army and police units marched into the state. A plebiscite later organised produced a 99.5% vote for merger with India. In a speech at the Bahauddin College in Junagadh following the latter's take-over, Patel emphasised his feeling of urgency on Hyderabad, which he felt was more vital to India than Kashmir:

“ If Hyderabad does not see the writing on the wall, it goes the way Junagadh has gone. Pakistan attempted to set off Kashmir against Junagadh. When we raised the question of settlement in a democratic way, they (Pakistan) at once told us that they would consider it if we applied that policy to Kashmir. Our reply was that we would agree to Kashmir if they agreed to Hyderabad. ”

Hyderabad was the largest of the princely states, and included parts of present-day Andhra Pradesh, Karnataka, and Maharashtra states. Its ruler, the Nizam Osman Ali Khan was a Muslim, although over 80% of its people were Hindu. The Nizam sought independence or accession with Pakistan. Muslim forces loyal to Nizam, called the Razakars, under Qasim Razvi pressed the Nizam to hold out against India, while organising attacks with militant Communists on people on Indian soil. Even though a Standstill Agreement was signed due to the desperate efforts of Lord Mountbatten to avoid a war, the Nizam rejected deals and changed his positions.[ In September 1948, Patel emphasised in Cabinet meetings that India should take no more, and reconciled Nehru and the Governor-General, Chakravarti Rajgopalachari to military action. Following preparations, Patel ordered the Indian Army to integrate Hyderabad (in his capacity as Acting Prime Minister) when Nehru was touring Europe.The action was termed Operation Polo, in which thousands of Razakar forces had been killed, but Hyderabad was comfortably secured into the Indian Union. The main aim of Mountbatten and Nehru in avoiding a forced annexation was to prevent an outbreak of Hindu-Muslim violence. Patel insisted that if Hyderabad was allowed to continue with its antics, the prestige of the Government would fall and then neither Hindus nor Muslims would feel secure in its realm. After defeating Nizam, Patel retained him as the ceremonial chief of state, and held talks with him.

Leading India

Governor General Chakravarti Rajagopalachari, Nehru and Patel formed the triumvirate which ruled India from 1948 to 1950. Prime Minister Nehru was intensely popular with the masses, but Patel enjoyed the loyalty and faith of rank and file Congressmen, state leaders and India's civil services. Patel was a senior leader in the Constituent Assembly of India and was responsible in a large measure for shaping India's constitution.[49] Patel was a key force behind the appointment of Dr. Bhimrao Ramji Ambedkar as the chairman of the drafting committee, and the inclusion of leaders from a diverse political spectrum in the process of writing the constitution.

Patel was the chairman of the committees responsible for minorities, tribal and excluded areas, fundamental rights and provincial constitutions. Patel piloted a model constitution for the provinces in the Assembly, which contained limited powers for the state governor, who would defer to the President—he clarified it was not the intention to let the governor exercise power which could impede an elected government. He worked closely with Muslim leaders to end separate electorates and the more potent demand for reservation of seats for minorities. Patel would hold personal dialogues with leaders of other minorities on the question, and was responsible for the measure that allows the President to appoint Anglo-Indians to Parliament. His intervention was key to the passage of two articles that protected civil servants from political involvement and guaranteed their terms and privileges. He was also instrumental in the founding the Indian Administrative Service and the Indian Police Service, and for his defence of Indian civil servants from political attack, he is known as the "patron saint" of India's services. When a delegation of Gujarati farmers came to him citing their inability to send their milk production to the markets without being fleeced by middlemen, Patel exhorted them to organise the processing and sale of milk by themselves, and guided them to create the Kaira District Co-operative Milk Producers' Union Limited, which preceded the Amul milk products brand. Patel also pledged the reconstruction of the ancient but dilapidated Somnath Temple in Saurashtra—he oversaw the creation of a public trust and restoration work, and pledged to dedicate the temple upon the completion of work (the work was completed after Patel's death, and the temple was inaugurated by the first President of India, Dr. Rajendra Prasad).

When the Pakistani invasion of Kashmir began in September 1947, Patel immediately wanted to send troops into Kashmir. But agreeing with Nehru and Mountbatten, he waited till Kashmir's monarch had acceded to India. Patel then oversaw India's military operations to secure Srinagar, the Baramulla Pass and the forces retrieved a lot of territory from the invaders. Patel, along with Defence Minister Baldev Singh administered the entire military effort, arranging for troops from different parts of India to be rushed to Kashmir and for a major military road connecting Srinagar to Pathankot be built in 6 months. Patel strongly advised Nehru against going for arbitration to the United Nations, insisting that Pakistan had been wrong to support the invasion and the accession to India was valid. He did not want foreign interference in a bilateral affair. Patel opposed the release of Rs. 55 crores to the Government of Pakistan, convinced that the money would go to finance the war against India in Kashmir. The Cabinet had approved his point but it was reversed when Gandhi, who feared an intensifying rivalry and further communal violence, went on a fast-unto-death to obtain the release. Patel, though not estranged from Gandhi, was deeply hurt at the rejection of his counsel and a Cabinet decision.

In 1949, a crisis arose when the number of Hindu refugees entering West Bengal, Assam and Tripura from East Pakistan climbed over 800,000. The refugees in many cases were being forcibly evicted by Pakistani authorities, and were victims of intimidation and violence. Nehru invited Liaquat Ali Khan, Prime Minister of Pakistan to find a peaceful solution. Despite his aversion, Patel reluctantly met Khan and discussed the matters. Patel strongly criticised, however, Nehru's intention to sign a pact that would create minority commissions in both countries and pledge both India and Pakistan to a commitment to protect each other's minorities. Syama Prasad Mookerjee and K.C. Neogy, two Bengali ministers resigned and Nehru was intensely criticised in West Bengal for allegedly appeasing Pakistan. The pact was immediately in jeopardy. Patel however, publicly came out to Nehru's aid. He gave emotional speeches to members of Parliament, and the people of West Bengal, and spoke with scores of delegations of Congressmen, Hindus, Muslims and other public interest groups, persuading them to give peace a final effort. The pact was approved and within a year, most of the Hindu refugees had returned to East Pakistan.

Gandhi's death and relations with Nehru

Patel with Gandhi in the early 1940s
Patel with Gandhi in the early 1940s

Patel was intensely loyal to Gandhi and both he and Nehru looked to him to arbitrate disputes. However, Nehru and Patel sparred over national issues. When Nehru asserted control over Kashmir policy, Patel objected to Nehru's sidelining his home ministry's officials. Nehru was offended by Patel's decision-making regarding the states' integration, having neither consulted him nor the cabinet. Patel asked Gandhi to relieve him of his obligation to serve, knowing that he lacked Nehru's youth and popularity. He believed that an open political battle would hurt India. After much personal deliberation and contrary to Patel's prediction, Gandhi on 30 January 1948 told Patel not to leave the government. A free India, according to Gandhi, needed both Patel and Nehru. Patel was the last man to privately talk with Gandhi, who was assassinated just minutes after Patel's departure. At Gandhi's wake, Nehru and Patel embraced each other and addressed the nation together. Patel gave solace to many associates and friends and immediately moved to forestall any possible violence. Within two months of Gandhi's death, Patel suffered a major heart attack; the timely action of his daughter, his secretary and nurse saved Patel's life. Speaking later, Patel attributed the attack to the "grief bottled up" due to Gandhi's death.

Criticism arose from the media and other politicians that Patel's home ministry had failed to protect Gandhi. Emotionally exhausted, Patel tendered a letter of resignation, offering to leave the government. Patel's secretary convinced him to withhold the letter, seeing it as fodder for Patel's political enemies and political conflict in India. However, Nehru sent Patel a letter dismissing any question of personal differences and his desire for Patel's ouster. He reminded Patel of their 30-year partnership in the freedom struggle and asserted that after Gandhi's death, it was especially wrong for them to quarrel. Nehru, Rajagopalachari and other Congressmen publicly defended Patel. Moved, Patel publicly endorsed Nehru's leadership and refuted any suggestion of discord. Patel publicly dispelled any notion that he sought to be prime minister. Though the two committed themselves to joint leadership and non-interference in Congress party affairs, they would criticise each other in matters of policy, clashing on the issues of Hyderabad's integration and UN mediation in Kashmir. Nehru declined Patel's counsel on sending assistance to Tibet after its 1950 invasion by the People's Republic of China and ejecting the Portuguese from Goa by military force.

When Nehru pressured Dr. Rajendra Prasad to decline a nomination to become the first President of India in 1950 in favour of Rajagopalachari, he thus angered the party, which felt Nehru was attempting to impose his will. Nehru sought Patel's help in winning the party over, but Patel declined and Prasad was duly elected. Nehru opposed the 1950 Congress presidential candidate Purushottam Das Tandon, a conservative Hindu leader, endorsing Jivatram Kripalani instead and threatening to resign if Tandon was elected. Patel rejected Nehru's views and endorsed Tandon in Gujarat, where Kripalani received not one vote despite hailing from that state himself. Patel believed Nehru had to understand that his will was not law with the Congress, but he personally discouraged Nehru from resigning after the latter felt that the party had no confidence in him.

Death

Maniben Patel next to the body of her father, Sardar Vallabhbhai Patel, on 15 December 1950
Maniben Patel next to the body of her father, Sardar Vallabhbhai Patel, on 15 December 1950

On 29 March 1949, authorities lost radio contact with a plane carrying Patel, his daughter Maniben and the Maharaja of Patiala. Engine failure caused the pilot to make an emergency landing in a desert area in Rajasthan. With all passengers safe, Patel and others tracked down a nearby village and local officials. When Patel returned to Delhi, thousands of Congressmen gave him a resounding welcome. In Parliament, MPs gave a long, standing ovation to Patel, stopping proceedings for half an hour. In his twilight years, Patel was honoured by members of Parliament and awarded honorary doctorates of law by the Punjab University and Osmania University.

Patel's health declined rapidly through the summer of 1950. He later began coughing blood, whereupon Maniben began limiting his meetings and working hours and arranged for a personalised medical staff to begin attending to Patel. The Chief Minister of West Bengal and doctor Bidhan Roy heard Patel make jokes about his impending end, and in a private meeting Patel frankly admitted to his ministerial colleague N. V. Gadgil that he was not going to live much longer. Patel's health worsened after 2 November, when he began losing consciousness frequently and was confined to his bed. He was flown to Mumbai on 12 December to recuperate at his son Dahyabhai's flat—his condition deemed critical, Nehru and Rajagopalachari came to the airport to see him off.After suffering a massive heart attack (his second), he died on 15 December 1950. In an unprecedented and unrepeated gesture, on the day after his death more than 1,500 officers of India's civil and police services congregated to mourn at Patel's residence in Delhi and pledged "complete loyalty and unremitting zeal" in India's service. His cremation in Sonapur, Mumbai, was attended by large crowds, Nehru, Rajagopalachari, President Prasad, and many Congressmen and freedom fighters.