High Energy X-ray Telescope Data Analysis Method

The science analysis of the data from the High Energy X-ray Telescope(HE) on the Hard X-ray Modulation Telescope(HXMT) satellite is organized in three stages:calibration,screening and extraction of high-level scientific products.At the first stage,the raw PHA value of each event is converted to PI value accounting for temporal changes in gain and energy offset.At the second stage,the calibrated events are screened by applying cleaning criteria.At the third stage,scientific products,i.e.spectra,light curves and redistribution matrix files,are extracted.This work will introduce the three stages as well as the screening criteria and the data combining method.

A novel quantificational assessment method of frothers effect on bubble characteristics

A new visual method for quantitative measurement of frothers effect and flotation efficiency was presented. A self-designed electrolytic cell was chosen as the reaction environment with sodium chloride (NaCl) as the electrolyte. Constant current, supplied by a self-designed power supplier and fixed cathode and anode equipment, guaranteed the constant bubble volume per unit time. Even aperture of the cathode material guaranteed the original bubbles size to be uniform. Bubble generating equipment was connected with a microscopical camera. Statistic data collected by high speed charge-coupled device (CCD) and processed by software Sigmascan and Matlab could reflect bubble characteristics. The efficiency of dipropylene glycol monomethyl ether (DPM) and tripropylene glycol n-butyl ethel (TPnB) were measured at the same condition, and 2×10-4 mol/L and 5×10-2 mol/L were found to be the inflexions of bubble size changes.

High Frequency Charging Techniques—Grid Connected Power Generation Using Switched Reluctance Generator

Power generation becomes the need of developed, developing and under developed countries to meet their increasing power requirements. When affordability increases their requirement of power increases, this happens when increased per capita consumption. The existing power scenario states that highest power is produced using firing of coals called thermal energy. A high efficiency Switched Reluctance Generator (SRG) based high frequency switching scheme to enhance the output for grid connectivity is designed, fabricated and evaluated. This proposed method generates the output for the low wind speed. It provides output at low speed because of multi-level DC-DC converter and storage system. It is an efficient solution for low wind power generation. The real time readings and results are discussed.

Sure feature screening for high-dimensional dichotomous classification

The curse of high-dimensionality has emerged in the statistical fields more and more frequently.Many techniques have been developed to address this challenge for classification problems. We propose a novel feature screening procedure for dichotomous response data. This new method can be implemented as easily as t-test marginal screening approach, and the proposed procedure is free of any subexponential tail probability conditions and moment requirement and not restricted in a specific model structure. We prove that our method possesses the sure screening property and also illustrate the effect of screening by Monte Carlo simulation and apply it to a real data example.

Mathematical modelling of the progression of active tuberculosis:Insights from fluorography data

Little is known about the dynamics of the early stages of untreated active pulmonary tuberculosis:unknown are both the rates of progression and the model“scheme”.The“parallel”scheme assumes that infectiousness of tuberculosis cases is effectively predefined at the onset of the disease,and the“serial”scheme considers all cases to be noninfectious at the onset,with some of them later becoming infectious.Our aim was to estimate the progression of the early stages of pulmonary tuberculosis using data from a present-day population.We used the routine notification data from Moscow,Russia,2013e2018 that contained the results and time of the last fluorographic screening preceding the detection of tuberculosis cases.This provided time limits on the duration of untreated tuberculosis.Parameters of TB progression under both models were estimated.By the goodness of fit to the data,we could prefer neither the“parallel”,nor the“serial”model,although the latter had a bit worse fit.On the other hand,the observed rise in the fraction of infectious tuberculosis cases with the time since the last screening was explained by the“serial”model in a more plausible way e as gradual progression of some cases to infectiousness.The“parallel”model explained it through less realistic quick removal of non-infectious cases and accumulation of the infectious ones.The results demonstrate the potential of using such detection data enriched with reassessments of the previous screenings.