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This paper studied the dosimetry of patients with cervical cancer using three-dimensional conformal radiotherapy (3D-CRT) and intensity-modulated radiation therapy (IMRT). The doses of target areas and the organs at risk (OAR) were studied and analyzed in detail, which will give us a base for clinical choice of cervical cancer radiotherapy technology. Twenty cases of cervical cancer patients were...
Through mathematical modeling, this paper analyzes three operation models of reverse logistics including manufacturer take-back, retailer take-back and third party take-back. The optimal solutions of the take-back price, the take-back quantity and the profit of manufacturer a resolved from these models, and two inferences are obtained from the comparative analysis of these optimal solutions. Furthermore,...
Monocrystalline p-ZnTe/p-CdTe/n-CdTe/n-MgCdTe double-heterostructure (DH) solar cells are designed and demonstrated with a maximum efficiency of 10.9 %, an open-circuit voltage (VOC) of 759 mV, a short-circuit current density (JSC) of 21.2 mA/cm2 and a fill factor (FF) of 67.4 %. The low efficiency is mainly due to the combination of the low VOC and FF, which are attributed to high interface recombination...
A II–VI/Si tandem cell concept is proposed here to potentially reach greater than 30% energy conversion efficiency under one-sun condition. The required MgCdTe alloy with a bandgap of ∼ 1.7 eV has been successfully grown on InSb (100) substrates by molecular beam epitaxy with excellent structural and optical qualities, confirmed by high-resolution X-ray diffraction, and temperature-dependent steady-state...
Volatility is a very important factor of measuring financial risk. This paper introduces the volatility measurement method of high frequency financial time series involving the nonnegativeMultiplicative Error Model. This paper takes the high frequency data of HS300 index of Chinese stock market as the research object, building the TARCH model according to leverage, and uses the "realized volatility"...
This paper analyses the trade duration of HS300 index ultra-high frequency data using ACD model. First, we research the amplitude characteristics of the volatility in spatial direction, and analyze the density characteristics of the volatility in time axis. Then from the angle of the three-dimensional we make a comprehensive analysis on high frequency data in space and time. Finally, by constructing...
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