Difference in electron- and gamma-irradiation effects on output characteristic of color CMOS digital image sensors

Changes of the average brightness and non-uniformity of dark output images, and quality of pictures captured under natural lighting for the color CMOS digital image sensors irradiated at different electron doses have been studied in comparison to those from the γ-irradiated sensors. For the electron-irradiated sensors, the non-uniformity increases obviously and a small bright region on the dark image appears at the dose of 0.4 kGy. The average brightness increases at 0.4 kGy, increases sharply at 0.5 kGy. The picture is very blurry only at 0.6 kGy, showing the sensor undergoes severe performance degradation. Electron radiation damage is much more severe than γ radiation damage for the CMOS image sensors. A possible explanation is presented in this paper,     

Effect of hot plastic deformation on microstructure and mechanical property of Mg-Mn-Ce magnesium alloy

Hot plastic deformation was conducted using a new solid die on a Mg-Mn-Ce magnesium alloy. The results of microstructural examination through OM and TEM show that the grain size is greatly refined from 45 μ to 1.1 μm with uniform distribution due to the occurrence of dynamic recrystallization. The grain refinement and high angle grain boundary formation improve the mechanical properties through tensile testing with the strain rate of 1.0× 10^-4 S^-1 at room temperature and Vickers microhardness testing. The maximum values of tensile strength, elongation and Vickers microhardness are increased to 256.37 MPa, 17.69% and HV57.60, which are 21.36%, 133.80% and 20.50% more than those of the as-received Mg-Mn-Ce magnesium alloy, respectively. The SEM morphologies of tensile fractured surface indicate that the density and size of ductile dimples rise with accumulative strain increasing. The mechanism of microstructural evolution and the relationship between microstructure and mechanical property of Mg-Mn-Ce magnesium alloy processed by this solid die were also analyzed.     

铂钛不溶性阳极研制

主要研究了钛基镀铂工艺,确定了工艺中各种参数值,测定了铂钛不溶性阳极的各种性能.本工艺所得铂钛不溶性阳极耐腐蚀性强,与基体结合力好,镀层厚度2～5μm.     

1Cr18Ni9Ti不锈钢半固态浆料的制备和轧制

研究了1Cr18Ni9Ti不锈钢半固态浆料的制备和轧制规律，结果表明：在本实验条件下，当搅拌时间为2—3min时，可以获得尺寸大小为10m-200μm、固相率为50％—60％的球状初生奥氏体的半固态浆料，便于从搅拌室底孔中放出，浆料可以实现顺利轧制，但球状初生固相颗粒与液相发生了分离，球状初生固相颗粒集中在轧材的心部，而液相偏聚在轧材的四周；经过一道次轧制，1Cr18Ni9Ti不锈钢半固态浆料轧制板材的常温强度比常规热轧板材的强度高，但延伸率下降。     

Influence of addition of Cu（OH）2 to KOH alkaline electrolyte on electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode

The influence of the addition of Cu（OH）2 to 6 mol/L KOH alkaline electrolyte on the electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode was investigated by electron probe X-ray microanalysis（EPMA）, X-ray diffraction（XRD） and electrochemical measurements. EPMA micrographs and XRD patterns show that the surface of the hydride electrode is plated by metal copper film. The thickness and compactness of Cu film increase with the increment of charge-discharge cycle number. The copper film of the hydride electrode surface can keep the hydrogen storage alloy particle in the electrode interior from oxidizing availably. The addition of Cu（OH）2 to alkaline electrolyte lowers the activation property and the high rate dischargeability of the La2Mg0.9Al0.1Ni7.5Co1.5 hydride electrode, but has no negative effect on the maximum discharge capacity of the hydride electrode. Moreover, it is effective to improve the cyclic stability of the hydride electrode utilizing electrodeposit Cu film on theLa2Mg0.9Al0.1Ni7.5Co1.5 hydride electrodes surface.     

古运河浅埋暗挖超前支护效果影响因素分析

根据浅埋暗挖区工程地质条件和固结注浆原理,分析了超前小导管注浆效果不明显的主要原因,并为改善注浆效果提出了建议。     

一种适用于多样性环境的业务流程挖掘方法

从运行日志挖掘业务流程模型的流程挖掘方法研究方兴未艾,然而,复杂多变的运行环境使流程日志也不可避免地呈现出多样性.传统的流程挖掘算法各有其适用对象,因此,如何挑选适合多样性流程日志的流程挖掘算法成为了一项挑战.提出一种适用于多样性环境的业务流程挖掘方法 So Fi(survival of fittest integrator).该方法基于领域知识对日志进行分类,使用多种现有的挖掘算法对每一类子日志产生一组流程模型作为遗传算法的初始种群,借助遗传算法的优化能力,从中整合得到高质量的业务流程模型.针对模拟日志和某通信公司真实日志的实验结果表明:相对于任何单一的挖掘算法,So Fi产生的流程模型具有更高的综合质量,即重现度、精确度、通用性和简单性.     

数据中心计算环境应用承载能力评价

随着新型计算服务模式在数据中心的普及,针对如何有效评价其承载能力的问题,提出一种新的应用承载能力评价体系和评价模型,具体分析了网络、计算资源对服务环境的影响度,并给出了实例分析。实例分析结果表明,新的评价体系和评价模型可以有效评估计算服务模式对各类信息服务系统部署运行的应用承载能力,进而提升信息服务保障整体效益。     

汉语复合名词语义信息标注词库: 基于生成词库理论

复合名词分析一直是语言研究和自然语言信息处理中的一个重要问题,涉及未登录词的识别、自动释义以及词典编纂等。生成词库理论是目前较新的一种语义学理论,我们拟利用该理论对汉语复合名词进行语义信息标注,建立一个词库。该文首先介绍了这一词库的标注框架,然后通过对“纸”、“石”构成的复合词的对比分析,展示了这一词库在复合名词构词、语义研究中的应用。研究结果显示,物性角色、自然类和人造类是非常重要的语义信息,能揭示复合名词构词和语义的一些模式和规律。