放大电路中反馈类型的判断

反馈在电子技术中得到了广泛的应用,在放大电路中经常引入负反馈来改善电路的工作状态和性质。该文主要分析了反馈的几种类型及反馈类型的判别方法,通过一些简捷的判别方法可以快速判断一个放大电路是什么类型的反馈,以便对电路的性能有更好的了解。     

基于XML Schema抽象模型的XML模式验证方法

XML模式验证作为处理XML数据的前提和保证有着重要的地位,XML Schema作为XML的定义语言,其本身并不能保证XML数据的有效性.利用XML Schema抽象模型,定义了XML Schema中每个复杂类型的模式信息,并用非终节点序对集描述XML文档,最后给出了XML模式验证算法,可以有效地验证XML文档的组织结构和内容类型.     

4GL编译时类型识别机制研究与设计

类型识别是编译器开发中的一项重要工作，也是语义分析中的一个最重要组成部分。本论文以JE4VB(Java Editon for VB)系统开发为背景，介绍将VB代码移植成Java代码的高级编译器中的类型识别问题。通过研究了4GL编译器语义分析过程中的类型识别问题，根据给出的抽象语法树和符号表，提出类型识别的解决方案，并给出详细的实现算法。     

科研团队中心理契约与创新行为的关系研究

近年来,心理契约的研究成为组织行为学研究的焦点,吸引了众多学者的理论探讨与实证研究。本文先对心理契约的概念、维度进行介绍,然后探讨科研团队中创新行为的影响因素,并阐述了科研团队中不同类型的心理契约对创新行为的影响作用。     

基于隐变量贝叶斯模型的稀疏信号恢复

该文基于贝叶斯分析的视角,揭示了一类算法,包括使用隐变量模型的稀疏贝叶斯学习(SBL),正则化FOCUSS算法以及Log-Sum算法之间的内在关联。分析显示,作为隐变量贝叶斯模型的一种,稀疏贝叶斯学习使用第2类最大似然(Type II ML)在隐变量空间进行运算,可以视作一种更为广义和灵活的方法,并且为不适定反问题的稀疏求解提供了改进的途径。较之于目前基于第1类最大似然(Type I ML)的稀疏方法,仿真实验证实了稀疏贝叶斯学习的优越性能。     

印刷油墨清洗剂

文章介绍了印刷油墨的组成及性能，印刷油墨清洗剂的类型、配制方法及其性能特点。并介绍了乳化型油墨清洗剂与半水基油墨清洗剂的区别和联系。     

基于肠道菌群探讨葛根芩连汤治疗湿热型2型糖尿病研究进展*

摘 要: 近年来世界范围内2型糖尿病(Diabetes Mellitus type 2,T2DM)的发病率不断上升。微生态学研究证实,T2DM疾病的发生与肠道菌群数量及比例的失调有很大的关联性,这成为研究热点。现有实验发现:肠道菌群紊乱可通过短链脂肪酸学说、胆汁酸代谢学说、内毒素学说、支链氨基酸学说等机制来影响T2DM的发生发展。湿热证T2DM患者在临床最为常见,该类患者胰岛素抵抗最为严重,而动物实验研究发现葛根芩连汤可通过特定的分子机制及通路作用于肠道菌群,通过调节胰岛β细胞的功能、提高胰岛素敏感性、减轻氧化应激反应,从而调节血糖,减轻胰岛素抵抗,为临床治疗T2DM患者提供更科学的依据。但由于菌群数量庞杂,现有数据多偏重于动物实验,且研究菌群特异性不足,为此今后需进一步加强对T2DM特定菌群的研究,以及增加临床大样本数据统计。     

建筑接缝的类型及防水材料的选择使用

建筑物的接缝形式及材料繁多 ,本文对接缝的形式 ;缝的变形量、宽度与深度计算 ;密封材料的选择及应用方法 ,结合工程实际进行浅介     

Corrosion protection of 304 stainless steel bipolar plates using TiC films produced by high-energy micro-arc alloying process

Metallic bipolar plates look promising for the replacement of graphite due to higher mechanical strength, better durability to shocks and vibration, no gas permeability, acceptable material cost and superior applicability to mass production. However, the corrosion and passivation of metals in environments of proton exchange membrane fuel cell (PEMFC) cause considerable power degradation. Great attempts were conducted to improve the corrosion resistance of metals while keeping low contact resistance. In this paper, a simple, novel and cost-effective high-energy micro-arc alloying process was employed to prepare compact titanium carbide as coatings for the type 304 stainless steel bipolar plates with a metallurgical bonding between the coating and substrate. It was found that TiC coating increased the corrosion potential of the bare steel in 1 M H₂SO₄ solution at room temperature by more than 200 mV, and decreased significantly its corrosion current density from 8.3 μA cm⁻² for the bare steel to 0.034 μA cm⁻² for the TiC-coated steel. No obvious degradation was observed for the TiC coatings after 30-day exposure in solution.     

Formation of nano-patterned protein layers on poly (lactic acid) surface: Induced by dewetting process and self-assembly

A simple method was developed to fabricate nano-patterned protein layers on poly (lactic acid) (PLA) surface by dewetting method. It was found that nano-patterned protein layers were formed on PLA surface by slow drying in high humidity. The influence of wettability and viscoelastic properties of substrates were also investigated. As a result, typical spinodal dewetting patterns formed for BSA. However, network structures were obtained for collagen at acidic condition and well-oriented fibrils at neutral pH. It was attributed to dewetting on hydrophobic substrate as well as the plasticity and variety of collagen self-assemblies.