Search results for: K. Tankeshwar

Items from 1 to 8 out of 8 results

article

Carbon nanotubes: A potential material for energy conversion and storage

Sandeep Kumar, Monika Nehra, Deepak Kedia, Neeraj Dilbaghi, more

Progress in Energy and Combustion Science > 2018 > 64 > C > 219-253

Carbon nanotube-based materials are gaining considerable attention as novel materials for renewable energy conversion and storage. The novel optoelectronic properties of CNTs (e.g., exceptionally high surface area, thermal conductivity, electron mobility, and mechanical strength) can be advantageous for applications toward energy conversion and storage. Although many nanomaterials are well known for...

article

Hidden Markov Model for quantitative prediction of snowfall and analysis of hazardous snowfall events over Indian Himalaya

J C Joshi, K Tankeshwar, Sunita Srivastava

Journal of Earth System Science > 2017 > 126 > 3 > 1-12

A Hidden Markov Model (HMM) has been developed for prediction of quantitative snowfall in Pir-Panjal and Great Himalayan mountain ranges of Indian Himalaya. The model predicts snowfall for two days in advance using daily recorded nine meteorological variables of past 20 winters from 1992–2012. There are six observations and six states of the model. The most probable observation and state sequence...

article

Role of triplet correlations in anomalous self-diffusion coefficient

Gaganpreet, Sunita Srivastava, K. Tankeshwar

Chemical Physics > 2012 > 405 > Complete > 60-66

Self-diffusion coefficient and velocity auto correlation function of fluid interacting via the Gaussian core potential have been studied using Mori–Zwanzig memory function formalism. Two and three body contributions to second and fourth frequency sum rules of velocity auto correlation function have been calculated. These sum rules and an ansatz for the memory function have been used to study the time...

article

Controlling Diffusion by Varying Width of Layers in Nano Channel

Ishu Goyal, Sunita Srivastava, K. Tankeshwar

Nano-Micro Letters > 2012 > 4 > 3 > 154-157

Diffusive dynamics of fluid forming layers of high and low density regions in a nanochannel has been investigated. Diffusion coefficient in direction parallel and perpendicular to the confining wall has been found to show behaviour which is not observed in micro channel or bulk systems. The behaviour of diffusion is found to be controlled by the width of layers formed in nanochannel due to wall and...

article

Diffusion of fluid confined to nanotube with rectangular cross section

Reena Devi, Jyoti Sood, Sunita Srivastava, K. Tankeshwar

Microfluidics and Nanofluidics > 2010 > 9 > 4-5 > 737-742

A dynamical model is proposed to study self-diffusion coefficient by confining the fluid in rectangular nanotube. The theoretical model is based on the consideration that the confinement affects the movement at atomic level. The model predicts that the diffusion parallel to walls of channel is different from that of diffusion perpendicular to the walls. Near the walls the dynamics of fluid has been...

article

Longitudinal and bulk viscosities of binary fluid mixtures

A. H.M. Zaheri, S. Srivastava, K. Tankeshwar

The European Physical Journal B > 2008 > 61 > 4 > 465-473

. Expressions for zeroth, second and fourth sum rules of longitudinal and bulk stress auto correlation functions have been derived for binary fluid mixtures. Longitudinal and bulk viscosities of an Ar–Kr mixture have been calculated using Mori's memory function formalism coupled with the sum rules of longitudinal and bulk stress auto correlation functions. The results obtained are compared with the...

article

Dynamical structure factor of liquid Li, Na and Al

Shaminder Singh, Jyoti Sood, K. Tankeshwar

Journal of Non-Crystalline Solids > 2007 > 353 > 32-40 > 3134-3138

The dynamical structure factors, S(q,ω) of liquid lithium, sodium and aluminium have been studied near their melting points using Mori’s memory function formalism. The second order memory function was obtained by exploiting non-Markovian nature of the fourth order memory function and assuming that memory functions at their alternate stage have the same functional time dependence. We obtain an analytical...

article

Current correlation functions of ideal fermi gas at finite temperature

R P Kaur, K Tankeshwar, K N Pathak

Pramana > 2002 > 58 > 4 > 703-711

Expressions for transverse and longitudinal current-current correlation functions of an ideal Fermi gas describing the current fluctuations induced in the electron system by external probe perpendicular and parallel to the propagation of electron wave, have been obtained at finite temperature. The results obtained for transverse and longitudinal functions are presented for different values of wavelength...

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