Growth and characterization of hot-wall epitaxial CdTe on (111) HgCdTe and CdZnTe substrates

Thin CdTe films were deposited by hot-wall epitaxy (HWE) on (111) HgCdTe and CdZnTe substrates at temperatures from about 140 to 335°C. X-ray rocking curves were used to show that crystal quality of the CdTe (111)B films improved as substrate temperature increased from 140 to about 250°C. Rocking curve values for full width at half maximum (FWHM) decreased from 2–4 degrees at 140–150°C to less than 100 arc-s at 250°C, and a FWHM of 59 arc-s was the lowest value observed near 250°C. The FWHM of the HWE CdTe was found to be insensitive to growth rate below about 400Å/min, but increased to four degrees at 1250Å/min. X-ray diffraction confirmed that films grown on the B-face at higher temperatures were epitaxial, but contained a significant volume fraction, 35% to 50%, of rotational in-plane twins. Electron microscopy confirmed a coarse twin density, and photoluminescence spectra showed an absence of excitonic emission in the HWE films. Simultaneous growth on two (111) HgCdTe substrates with different surface polarities between 230°C and 335°C showed that deposition rate on the A-face decreased relative to that on the B-face as temperature increased. Films grown on the B-face exhibited better surface morphologies than those grown on the A-face.     

泥沙起动条件及机理的非线性研究

 分析了单颗粒、均匀沙及非均匀沙的起动现象及其机理，认为泥沙的起动属于突变论研究的范畴。从泥沙起动所遵循起动条件的力学规律出发，导出泥沙起动条件方程。在此基础上，利用尖点突变性质对各种泥沙起动现象及机理进行了描述和说明。     

Releasing N jobs to an unreliable machine

In this paper we develop an algorithm that determines the optimal times of releasing N jobs to an unreliable machine. The job processing times are assumed to be random and the machine is subject to random breakdowns. The objective is to minimize the cost incurred by jobs waiting in the system and utilizing the machine. The job flowtime distributions are first derived from which the average flowtimes and the machine completion time are calculated. Efficient computation of the average flowtimes are discussed in detail. The optimization methods and numerical examples are demonstrated.     

邻重氮萘醌改性酚醛树脂碱溶解特性的定量评价

本文提出了一种利用紫外—可见光分光光度仪定量评价高分子膜溶解速度的方法。并着重考查了邻重氮萘醌改性后的酚醛树脂在碱溶液中的溶解特性。实验表明,曝光后的树脂在碱溶液中首先溶胀,然后才开始溶解,即存在溶解滞后现象。溶解滞后和溶解速度与溶液的碱度有关,与树脂膜厚无关。     

银矿尾矿砂高强陶粒的研制

以广西凤凰银业有限公司的尾矿砂和废矿页岩为主要原料，在前期工作的基础上，经过实验室试验和生产线中试，成功生产出700～1000密度等级、筒压强度超过10MPa的高强陶粒。这为银矿的尾矿砂和废矿页岩的处理也为我国高强陶粒的生产探索了一条新路。     

Feasibility study on the use of polyallyldiglycol-carbonate cell dishes in TUNEL assay for alpha particle radiobiological experiments

In the present work, we have studied the feasibility of a method based on polyallyldiglycol-carbonate (PADC) films to investigate the effects of alpha particles on HeLa cervix cancer cells. Thin PADC films with thickness of about 20 μm were prepared from commercially available CR-39 films by chemical etching to fabricate custom-made petri dishes for cell culture, which could accurately record alpha particle hit positions. A special method involving “base tracks” for aligning the images of cell nuclei and alpha particle hits has been proposed, so that alpha particle transversals of cell nuclei can be visually counted. Radiobiological experiments were carried out to induce DNA damages, with the TdT-mediated dUTP Nick-End Labeling (TUNEL) fluorescence method employed to detect DNA strand breaks. The staining results were investigated by flow cytometer. The preliminary results showed that more strand breaks occurred in cells hit by alpha particles with lower energies. Moreover, large TUNEL positive signals were obtained even with small percentages of cells irradiated and TUNEL signals were also obtained from non-targeted cells. These provided evidence for the bystander effect.     

GCr15轴承钢的热变形模拟试验研究

利用先进的Gleeble-2000热模拟试验机，对GCr15轴承钢某一轧制过程进行模拟试验，测定出GCr15轴承钢动态CCT曲线，并结合微观组织分析，制定合理的GCr15轴承钢轧后控制冷却工艺，以期达到提高GCr15轴承钢质量的最终目的。     

采动覆岩中关键层运动对围岩支承压力分布的影响

运用数值模拟方法,主要分析了关键层的破断、关键层相对位置及采深等对围岩支承压力的影响;同时,研究了采空区支承压力的分布规律.研究结果对采场围岩的控制提供了一定的理论依据.     

韶钢第三炼钢厂2#板坯连铸机漏钢原因分析

针对韶钢三炼钢板坯连铸机的漏钢原因从设备与工艺上进行分析,提出整改措施,对韶钢以后的板坯发展提供了经验.