Nano technology is a modern advancement in science where the working parts of the device in question are in the order of 10⁻⁹m. Nanotech is studied in various ways of which the important ones are top down approach-These seek to create smaller devices by using larger ones to direct their assembly; bottom up approach-These seek to arrange smaller components into more complex assemblies; the nanomaterials per se-This includes subfields which develop or study materials having unique properties arising from their nanoscale dimensions; and functional approach-These seek to develop components of a desired functionality without regard to how they might be assembled.
The atomic force microscope (AFM) and the Scanning Tunneling Microscope (STM) are two early versions of scanning probes that launched nanotechnology.Another group of nanotechnological techniques include those used for fabrication of nanowires.
Health matters are of a concern nowadays. A major study published more recently in Nature Nanotechnology suggests some forms of carbon nanotubes – a poster child for the “nanotechnology revolution” – could be as harmful as asbestos if inhaled in sufficient quantities.
Modern technological advancement in this field is seen with respect to medical sciences where nanorobots enter the body and help in selectively destroying tumorous cells. Similarly micro surgeries are easily possible which is an advancement in minimally invasive procedures.
In the field of astrophysics, newer batteries are being developed using nanotech which could save more energy and hence can power the satellites for a longer duration.
Next to be mentioned is nanotubular advancement. Columns, pipes, bearings and springs are a few common ways that engineers have made use of the geometric shape known as a 'cylinder.' The utility of this shape is apparent in architecture, plumbing and mechanical devices. Carbon nanotubes are molecular cylinders that are rapidly extending our ability to fabricate nanoscale devices by providing molecular probes, pipes, wires, bearings and springs.
There are mmany more advancements and i urge all to contribute in further increasing our knowledge with regard to this field of science.

INS ARIHANT

The symbolic launch ceremony for the Arihant was held on on July 26, 2009 marked the anniversary of Vijay Diwas. It has been reported that the nuclear reactor and other systems are not yet included in the submarine. Arihant is in Sanskrit and literally translates into destroyer of enemies. The completion of the INS Arihant will make India one of six countries in the world with the ability to design, build, and operate its own nuclear submarines. The submarine is reported to be similar to the Russian Charlie-II class submarine, which India leased from the Soviet Union between 1988 and 1991.
The INS Arihant, was introduced to the public on July 26, 2009 at a symbolic launch ceremony by Prime Minister Manmohan Singh's wife Gursharan Kaur. the then chief of the navy admiral sureesh mehta is believed to have said that the russian help was in the form of consulting only and the sub marine is entirely indegenous..

India Israel defense relations

Islamic terrorism in both countries have generated a solid strategic alliance.[20]. India recently launched a military satellite for Israel through its Indian Space Research Organization
Weizman negotiated the first weapons deal between the two nations, involving the purchase of Barak-1 vertically-launched surface-to-air (SAM) missiles from Israel. The Barak-1 has the ability to intercept anti-ship cruise missiles such as the Harpoon.In what would be end of an era, Israel became India's biggest military supplier in 2009, supplying equipment worth more than 1 Billion Dollars each year.

India Russia defence deals

Russia has been an important supplier of defence goods for several decades. Today, the cooperation is not limited to a buyer-seller relationship but includes joint research and development, training, service to service contacts, including joint exercises.
India and Russia have several major joint military programs such as those mentioned below:

BrahMos cruise missile program
INS Vikramaditya aircraft carrier program
5th generation fighter jet program
Sukhoi Su-30MKI program (230+ to be built by Hindustan Aeronautics)
Ilyushin/HAL Tactical Transport Aircraft
T-90S Bhishma program. (1000+ to be built in India)
Akula-II nuclear submarine (2 to be leased)
Tu-22M3 bombers (4 ordered)
US$900 million upgrade of MiG-29
Mil Mi-17 (80 ordered)
Ilyushin Il-76 Candid (6 ordered to fit Israeli Phalcon radar)
However recently Admiral gorshkov was said to be incorporated into indian navy under the tag of INS Vikramaditya at a total cost of over 3 billion $..