[en] Engineering systems are subject to continuous stresses and shocks which may (or may not) cause a change in the failure pattern of the system with unknown probability q( =1 - p), 0 < p < 1. Conceptualising a mixture of hazard-rate or failure-rate patterns representing a realistic situation, the failure time distribution is given in the corresponding case. Classical and Bayesian estimation of the parameters and reliability characteristics of this failure time distribution is the subject matter of the present study

[en] We compute constitutive relations for a charged $(2+1)$ dimensional Schrödinger fluid up to first order in derivative expansion, using holographic techniques. Starting with a locally boosted, asymptotically AdS, $4+1$ dimensional charged black brane geometry, we uplift that to ten dimensions and perform $TsT$ transformations to obtain an effective five dimensional local black brane solution with asymptotically Schrödinger isometries. By suitably implementing the holographic techniques, we compute the constitutive relations for the effective fluid living on the boundary of this space-time and extract first order transport coefficients from these relations. Schrödinger fluid can also be obtained by reducing a charged relativistic conformal fluid over light-cone. It turns out that both the approaches result the same system at the end. Fluid obtained by light-cone reduction satisfies a restricted class of thermodynamics. Here, we see that the charged fluid obtained holographically also belongs to the same restricted class.

[en] In 21^st century, the demand of HSTR (High Strength Temperature Resistant) material is steadily increasing due to its numerous industrial applications. These materials are machined efficiently by Electro discharge machining (EDM) process. EDM process largely depends upon the electrode used, as different electrode material will have different properties and these properties affect the performance of the EDM process. Thus the selection of proper electrode material plays a very important role in EDM process. Different electrodes frequently used are Copper, Brass, Graphite, Copper Tungsten etc. In the present paper a detail study has been done over different copper and copper based electrodes used in EDM process. (paper)