Morphological defects of molecular beam epitaxy-grown CdTe and CdSeTe on Si

For the first time, focused ion beam milling, secondary electron microscopy, and transmission electron microscopy were used to examine in depth morphological defects during epitaxial growth of CdTe and CdSeTe on Si. Contrary to the literature regarding the formation of morphological defects at the epi/substrate interface, the present defects appear to originate from either the CdTe/CdSeTe interface or 3–4 μm above the CdTe/Si interface where the growth was interrupted and the substrate temperature was temporarily raised. This suggests a correlation between defect nucleation and either shutter movement or growth interruption.     

Optimal service of aging demands in a single-server system with variable service rate and payment for buffer place rent

Necessary and sufficient conditions are obtained for optimal service of aging demands, which minimize the value of an additive performance functional with specified cost of rent of places. Translated from Kibernetika i Sistemnyi Analiz, No. 3, pp. 145–150, May–June, 2000.     

长行程液压缸优化设计

针对长行程液压缸的冲击现象 ,建立了数学模型 ,并利用计算机对液压缸的结构参数进行优化求解。结果表明 :减少了液压系统的冲击 ,提高了缓冲的效果     

Stability of microcrystalline silicon solar cells with HWCVD buffer layer

Microcrystalline silicon solar cells deposited by VHF-PECVD with or without HWCVD grown p/i interface buffer layer were investigated. We studied long-term stability under storage in ambient atmosphere and performed light soaking experiments. Cells with i-layers covering a wide range of crystalline volume fractions were studied. All cells were stable or degraded slightly after storage for 2 years in air, regardless of crystalline volume fraction or presence of p/i buffer interface. Upon light soaking all cells show efficiency degradation to more or less extent depending on crystal volume fraction of the i-layer and the presence of the buffer layer: the solar cell with high crystal volume fraction are nearly stable, cells with high amorphous volume fraction degrade by up to 20%. The solar cell with HWCVD buffer layer shows better stability in the high efficiency range of relative efficiency degradation typically less than 10% after 1000 h AM 1.5 light soaking. The efficiency degradation is mainly caused by Voc and FF deterioration while Jsc is almost stable.     

混流泵站抬机过程仿真分析及研究

文章通过计算仿真模拟拍门关闭,分析研究拍门内侧真空压力的变化,提出降低关机真空、减小抬机发生,减小拍门撞击的的实际应对措施。     

Dynamics of native oxide growth on CdTe and CdZnTe X-ray and gamma-ray detectors

We studied the growth of the surface oxide layer on four different CdTe and CdZnTe X-ray and gamma-ray detector-grade samples using spectroscopic ellipsometry. We observed gradual oxidization of CdTe and CdZnTe after chemical etching in bromine solutions. From X-ray photoelectron spectroscopy measurements, we found that the oxide consists only of oxygen bound to tellurium. We applied a refined theoretical model of the surface layer to evaluate the spectroscopic ellipsometry measurements. In this way we studied the dynamics and growth rate of the oxide layer within a month after chemical etching of the samples. We observed two phases in the evolution of the oxide layer on all studied samples. A rapid growth was visible within five days after the chemical treatment followed by semi-saturation and a decrease in the growth rate after the first week. After one month all the samples showed an oxide layer about 3 nm thick. The oxide thickness was correlated with leakage current degradation with time after surface preparation.     

井底承罐装置采用弹簧缓冲的可行性研究

研究了缠绕式提升机井底承罐装置采用弹簧缓冲的可行性,并分析了现场实际应用状况,为设计新型承罐装置提供了理论依据．     

一种面向存储服务的缓存管理模型

给出一种适用于网络存储设备的面向存储服务的新型缓存管理模型,它支持可配置的缓存管理策略和可配置策略的缓存分配机制。与通用操作系统中的缓存管理模块相比,该模型的主要优点是使能针对具体存储应用的性能优化,使能多个存储应用之间的数据访问 QoS控制。     

Windows系统异常处理机制的研究及应用

从分析梳理Windows平台下异常处理机制的种类和特点入手,探讨它们的内部机理,特别是反汇编的实现和特征,研究它们在软件安全领域中的重要应用,从而说明异常处理机制除了可以帮助处理软件中出现的错误和异常外,还在软件安全领域大有作为,为进一步研究异常处理机制和扩展其应用范围打下基础。