Competing risk multistate censored data modeling by propensity score matching method

The potential contribution of the paper is the use of the propensity score matching method for updating censored observations within the context of multi-state model featuring two competing risks.The competing risks are modelled using cause-specific Cox proportional hazard model.The simulation findings demonstrate that updating censored observations tends to lead to reduced bias and mean squared error for all estimated parameters in the risk of cause-specific Cox model.The results for a chemoradiotherapy real dataset are consistent with the simulation results

Competing risk multistate censored data modeling by propensity score matching method

The potential contribution of the paper is the use of the propensity score matching method for updating censored observations within the context of multi-state model featuring two competing risks.The competing risks are modelled using cause-specific Cox proportional hazard model.The simulation findings demonstrate that updating censored observations tends to lead to reduced bias and mean squared error for all estimated parameters in the risk of cause-specific Cox model.The results for a chemoradiotherapy real dataset are consistent with the simulation results

Rozwiązania automorficzne dla cylindrycznej fali uderzeniowej przy rotacyjnym osiowo-symetrycznym przepływie gazu

Similarity solutions are obtained for an adiabatic flow behind a cylindrical shock wave propagating in a rotational axisymmetric flow of a perfect gas, in which initial velocity and density are functions of the distance from the axis of symmetry. The initial medium is considered to have a variable azimuthal velocity component in addition to the variable axial velocity. Initial velocities and density are assumed to obey power laws. Distributions of the fluid velocities, density, pressure and vorticity components are obtained in the flow-field behind the shock front. Effects of variable initial velocities and density and the variation of the shock-Mach number are investigated.W pracy przedstawiono rozwiązania automorficzne otrzymane dla adiabatycznego przepływu czynnika za cylindryczną fala uderzeniową rozchodzącą się w rotacyjnym, osiowo-symetrycznym opływie gazu doskonałego, którego prędkość początkowa oraz gęstość są funkcjami odległości od osi symetrii. W stanie początkowym, analizowany czynnik posiada oprócz zmiennej składowej osiowej prędkości dodatkowo zmienną składową azymutalną. Założono, że prędkości początkowe i gęstość opisują funkcje potęgowe. Rozkłady prędkości płynu, gęstość, ciśnienie oraz składowe wirowości otrzymano w polu przepływu za frontem fali uderzeniowej. Zbadano także wpływ prędkości początkowych oraz gęstości na zmiany wartości liczby Macha

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Not AvailableA concurrent survey was conducted in India during 2012-14 to estimate the harvest and post-harvest losses of cereals covering 107 districts. The losses were recorded by personal interviews and observations in different farm operations and market points. The district-level data were pooled according to agroclimatic zones (ACZ). The loss at the national level was estimated by pooling the loss at ACZ level using production as credence. Total losses of cereals at the national level varied between 4.65 to 5.99 per cent. Loss in farm operations ranged between 3.90 to 4.78 per cent, while, loss during storage was between 0.75 per cent to1.21 per cent. Delay in harvesting followed by improper threshing and winnowing and inappropriate storage practices contributed more towards overall losses. Overall, the estimated monetary value of losses was to the tune of Rs. 20698 crore at the average annual price of 2014 and production of selected cereals in 2012-13.The role of mechanisation in preventing losses of cereals is evident from the results as there were significantly lower losses in the mechanised regions of India.Not Availabl

Soft X-ray Focusing Telescope Aboard AstroSat: Design, Characteristics and Performance

The Soft X-ray focusing Telescope (SXT), India’s first X-ray telescope based on the principle of grazing incidence, was launched aboard the AstroSat and made operational on October 26, 2015. X-rays in the energy band of 0.3–8.0 keV are focussed on to a cooled charge coupled device thus providing medium resolution X-ray spectroscopy of cosmic X-ray sources of various types. It is the most sensitive X-ray instrument aboard the AstroSat. In its first year of operation, SXT has been used to observe objects ranging from active stars, compact binaries, supernova remnants, active galactic nuclei and clusters of galaxies in order to study its performance and quantify its characteriztics. Here, we present an overview of its design, mechanical hardware, electronics, data modes, observational constraints, pipeline processing and its in-orbit performance based on preliminary results from its characterization during the performance verification phase