Vinod Tewary

Vinod Tewary (born 1940) is an Indian American theoretical physicist at NIST (National Institute of Standards and Technology). Dr Tewary’s field of research is theoretical solid-state physics, with specialization in nanomaterials. He is the originator of the Tewary method for lattice statics, the Multiscale GF (MSGF) method , and the CGFMD (causal GF in molecular dynamics). These methods are used in the mathematical modeling of nanomaterials.
Additionally, Vinod Tewary is a published Hindi author.
==Early life and education==
Vinod Tewary was born in Hardoi, U.P., India, where he received his early education. He earned his B.Sc. and M.Sc. (Physics) degrees from the University of Lucknow (India), and his Ph.D. in Solid State Physics from the University of Delhi (India).
==Career==
•	Research Fellow at the University of Reading, UK
•	Research Fellow at the Indian Institute of Technology, Kanpur.
==Main Research==
1. Lattice statics GF (LSGF): A technique for atomistic scale (few Angstroms) modeling of the static processes in crystals containing lattice defects. The atomistic scale modeling is needed because the conventional continuum models are not meant for simulating the physical processes in crystals near lattice defects, where the discrete atomistic effects are important. The LSGF technique is also referred to as the Tewary method. It was first referred as the Tewary method in 1973. 
2. Multiscale GF (MSGF): for modeling modern nanomaterials. It is essentially a generalized version of LSGF and is valid at different length scales in crystals. It is specifically applicable to modern nanomaterials. A mathematical model for interpretation of data on nanomaterials must be multiscale because the atomistic scale effects are crucial at nanoscales, whereas the measurements are made at macroscales. The MSGF method links the atomistic scales to macroscales seamlessly. 
3. Causal GF in molecular dynamics (CGFMD) for modeling time-dependent processes, that can link multiple temporal scales from femtoseconds to nanoseconds, and even microseconds. It is a further extension of the MSGF method to incorporate the temporal effects. The temporal effects are needed for interpreting data in technological applications such as materials for storage batteries, thermoelectric devices, strong materials, radiation damage, etc. For example, in radiation damage in material systems used in space vehicles, the primary event consists of a high energy gamma photon hitting and displacing an atom in a solid. The secondary event consists of the displaced atom hitting and displacing other atoms, which in turn displace even more atoms in the solid. This cascade process causes a lot of damage to the material and make it unstable and unusable to carry any load. The primary event lasts for a few femtoseconds, whereas the secondary events may extend up to several microseconds. In order to understand the nature and extent of the damage and to design safe material systems, it is needed to simulate this process over multiple time scales ranging from femto to microseconds. The CGFMD technique is useful for such calculations. This research was reported in the Phys.org publication.
Category:1940 births
Category:People from Hardoi
Category:Indian people
[Category:University of Lucknow alumni]]
Category:Delhi University alumni
Category:Theoretical physicists
Category:Author