58,859 research outputs found
Exploring N-rich phases in LixNy clusters for hydrogen storage at nano-scale
We have performed cascade genetic algorithm and ab initio atomistic
thermodynamics under the framework of first-principles density functional
theory to study the (meta-)stability of a wide range of LixNy clusters. We
found that hybrid xc-functional is essential to address this problem as a
local/semi-local functional simply fails even to predict a qualitative
prediction. Most importantly, we find that though in bulk Lithium Nitride, Li
rich phase, i.e. Li3N, is the stable stoichiometry, in small LixNy clusters
N-rich phases are more stable at thermodynamic equilibrium. We further show a
that these N-rich clusters are promising hydrogen storage material because of
their easy adsorption and desorption ability at respectively low (< 300K) and
moderately high temperature (> 600K).Comment: 5 pages, 4 figure
Numerical Studies on Time Resolution of Micro-Pattern Gaseous Detectors
The Micro-Pattern Gaseous Detectors offer excellent spatial and temporal
resolution in harsh radiation environments of high-luminosity colliders. In
this work, an attempt has been made to establish an algorithm for estimating
the time resolution of different MPGDs. It has been estimated numerically on
the basis of two aspects, statistics and distribution of primary electrons and
their diffusion in gas medium, while ignoring their multiplication. The effect
of detector design parameters, field configuration and the composition of gas
mixture on the resolution have also been investigated. Finally, a modification
in the numerical approach considering the threshold limit of detecting the
signal has been done and tested for the RPC detector for its future
implementation in case of MPGDs
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