损失气求取方法研究

当逸散时间较长时，用直线回归法采取损失气结果偏低，而逸散时间较短取点数少时，结果偏高。曲线拟合法是比较实用的一种方法，但计算工作量较大。经过模拟实验证明，在变围压条件下，甲烷的解吸规律也服从经验方程Ｑ＝ＷＪ［１－ｅｘｐ（１－ｍ＿１￣ｍ２／ｍ＿２］，并推导出迭代法求取损失量的计算公式。     

Synthesis of C_f/TiAl_3 Composite by Infiltration-In Situ Reaction

Infiltration-in situ reaction synthesis of Cf /TiAl3 composite was investigated. The as-cast material was obtained by titanium particles, carbon fibers and pure aluminum. Titanium particles and carbon fibers were mixed and pressed to form a preform firstly, and then molten pure aluminum was pressed into the preform, subsequently, cooled rapidly. In situ reaction samples were obtained by heating the as-cast material from 600 to 1000 °C for 1 h. The microstructural evolution of in situ reaction samples was an...     

Proteomic Biomarkers of the Apnea Hypopnea Index and Obstructive Sleep Apnea: Insights into the Pathophysiology of Presence,Severity, and Treatment Response

Obstructive sleep apnea (OSA), a disease associated with excessive sleepiness and increased cardiovascular risk, affects an estimated 1 billion people worldwide. The present study examined proteomic biomarkers indicative of presence, severity, and treatment response in OSA. Participants (n = 1391) of the Stanford Technology Analytics and Genomics in Sleep study had blood collected and completed an overnight polysomnography for scoring the apnea–hypopnea index (AHI). A highly multiplexed aptamer-based array (SomaScan) was used to quantify 5000 proteins in all plasma samples. Two separate intervention-based cohorts with sleep apnea (n = 41) provided samples pre- and post-continuous/positive airway pressure (CPAP/PAP). Multivariate analyses identified 84 proteins (47 positively, 37 negatively) associated with AHI after correction for multiple testing. Of the top 15 features from a machine learning classifier for AHI ≥ 15 vs. AHI < 15 (Area Under the Curve (AUC) = 0.74), 8 were significant markers of both AHI and OSA from multivariate analyses. Exploration of pre- and post-intervention analysis identified 5 of the 84 proteins to be significantly decreased following CPAP/PAP treatment, with pathways involving endothelial function, blood coagulation, and inflammatory response. The present study identified PAI-1, tPA, and sE-Selectin as key biomarkers and suggests that endothelial dysfunction and increased coagulopathy are important consequences of OSA, which may explain the association with cardiovascular disease and stroke.     

基于ADSP2181的实时语音采集与处理板的原理与组成

把ＰＣ机接口技术与ＤＳＰ芯片技术相结合,设计了一块实时语音采集与处理板。由于采用了具有３０ｎｓ指令周期的ＡＤＳＰ２１８１芯片及专用的Ａ／Ｄ,Ｄ／Ａ芯片,本板能够对多种语音算法如Ｇ７２８,Ｇ７２９,Ｇ７２３,ＭＰＥＧ音频等算法实现实时编解码处理。由于这块板对外具有灵活方便的数字接口,它也可用于其他高速数字信号采集与处理应用的场合。     

中国典型城市电网电动汽车容纳能力研究

分析了电动汽车在无序充电、错峰充电和连续充电模式下的电力负荷特性,并以典型配电网为研究对象,通过对3种模式下不同规模电动汽车接入后的配电网稳态运行情况进行计算,.校核节点电压偏差和元件负载率等配电网稳态运行指标,研究了各种充电模式下中国某典型城市电网的电动汽车容纳能力.     

低压供电系统快速漏电保护技术

介绍了一种保证低压供电系统人身触电安全的漏电保护技术，并阐述了其基本原理，介绍了实现方案及实际应用情况。     

Effects of vacancy structural defects on the thermal conductivity of silicon thin films

Vacancy structural defect effects on the lattice thermal conductivity of silicon thin films have been investigated with non-equilibrium molecular dynamics simulation.The lattice thermal conductivities decrease with increasing vacancy concentration at all temperatures from 300 to 700 K.Vacancy defects decrease the sample thermal conductivity,and the temperature dependence of thermal conductivity becomes less significant as the temperature increases.The molecular dynamics result is in good agreement with the theoretical analysis values obtained based on the Boltzmann equation.In addition,theoretical analysis indicates that the reduction in the lattice thermal conductivity with vacancy defects can be explained by the enhanced point-defect scattering due to lattice strain.     

热重法确定MMH微晶中各种水分的相对含量

借助热分析仪对MMH微晶进行了TG和DTG分析,研究了MMH微晶中各种水分的相对含量。提出MMH微晶中存在4种水分,即自由水、松散吸附水和紧密吸附水、结晶水和羟基水,给出了MMH微晶的完整表达式,即 MgAl_(0.965)(OH)_(4.75)Cl_(0.145·1.70)H_2O。     

GaAIAs/GaAs正面发光管的失效机理研究

研究和分析了高辐射GaAlAs/GaAs LED的退化机理。经高温加速老化,估算器件的工作寿命为10~5小时,并估算该器件的激活能为0.58eV。