高职院校综合素质课程改革探讨

作为能力精神导向的综合素质课程是高职院校深化内涵建设的重要内容,从指导思想、客观因素、生源因素等方面分析高职院校综合素质课程不容乐观的现状,针对此现状及原因,对高职院校综合素质课程课程改革思路、目标及改革方案等进行了探讨。     

“省管县”与“市管县”协调并举的可行性分析

从80年代开始实行的"市管县"体制,经过多年的实践,这种体制的优势正在渐渐消失,改革势在必行。"省管县"作为一种新的行政管理体制深受学界推崇,但是,该体制在推进过程中也同样存在许多弊端。从理论与实践的角度,分析了"省管县"与"市管县"协调并举的可行性。     

“作××语”还是“做××语”辨——以黄伯荣、廖旭东《现代汉语》(增订四版)为例

以黄伯荣、廖旭东版《现代汉语》(增订四版)第二册中的"作"和"做"用法不统一现象为例,分析了造成不统一现象的原因,探讨了正确的用法,提出了用法建议。     

Preparation and properties of Ce0.8Ca0.2O1.8 anode material by glycine-nitrate process

Ce0.8Ca0.2O1.8（CDC82） anode material was prepared by glycine-nitrate process（GNP）. Thermogravimetric（TG） analysis and differential scanning calorimetric（DSC） methods were adopted to characterize the reaction process of CDC82 material. X-ray diffractometry（XRD）, scanning electron microcopy（SEM）, direct current four probe （four-probe DC） and temperature process reduce（TPR） techniques were adopted to characterize the properties of CDC82 material. After the precursor was sintered at 750℃ for 4 h, CDC82 material with pure-fluorite structure and nanometer size was obtained. The total conductivity of CDC82 changes little with temperature in air at 50-850℃, and the maximum value is 0.04 S/cm at 750 ℃. The total conductivity wholly becomes larger when the atmosphere changes from air to hydrogen, which greatly increases with increasing temperature and reaches the maximum value of 1.09 S/cm at 850 ℃. Some impurities such as CeMg and La203 exist after the mixture of CDC82 anode and La1-xSrxGa1-yMgyO3-δ （LSGM） electrolyte material is sintered at 1 200 ℃ for 15 h. The CDC82 material as anode material has excellent catalytic property for hydrogen and methane.     

中国镁工业研究方向探讨

简单介绍了我国镁资源状况以及我国镁工业的发展历程和现状,分析了我国现有镁工业中存在的一些问题。在当前许多传统金属资源已面临枯竭之际,强调了加速发展镁工业的必要性。文章从镁冶炼工艺的研究和镁合金成形技术的研究两个方面对中国镁工业今后的研究方向进行了探讨,并指出真空碳热还原法炼镁等新工艺的开发研究和镁合金机械成形、超塑性成形、触变成形和流变成形等技术的开发研究是促进中国镁工业发展的关键。最后对中国的镁工业作了展望。     

PEMSIP法沉积的TiN涂层对刀具切削性能的影响

基片负偏压增加，使等离子体增强磁控溅射离子镀TiN涂层的相组成朝着富氨相及其含量增加的方向发展，由Ti2N和TiK两相组成的涂层硬度最高，可达Hk2460。切削力测定表明，由Ti2N和TiN两相组成的刀具涂层使切削力略有下降。涂层能明显提高刀具耐用度。     

CARBON-OXYGEN REACTION IN MOLTEN NICKEL AND NICKEL-10% CHROMIUM IN A VACUUM INDUCTION FURNACE

在电熔氧化镁坩埚中真空感应熔炼镍和镍-10％铬合金,于1500—1540℃温度和10~(-4)乇压力的条件下,通过三种不同方法(碳脱氧、氧脱碳)获得了10~(-5)-10~(-6)数量级的碳氧乘积;对碳氧反应的机理提出了看法。     

TiN涂层电化学腐蚀行为研究——Ⅱ．添加A1对TiN涂层保护性能与失效机制的影响

利用电化学方法以及扫描电镜(SEM)、扫描隧道显微镜(STM)技术等，研究了添加A1对离子镀TiN薄膜涂层在0．5mol/L NaCl和1mol/L H2SO4溶液中的保护性能和失效机制的影响，发现铝的添加使TiN涂层在中性和酸性溶液中的耐蚀性能明显改善．A1元素对TiN涂层具有自修复作用．     

Morphology, structure and formation mechanism of silicide coating by pack cementation process

The MoSi2 coating on C 103 niobium based alloy was prepared by pack cementation method. The formative mechanism, morphology and structure of coating were investigated. The silicide coating was formed by reactive diffusion obeying parabolic rule during pack cementation process. It is found that the composite structural coating is composed of three inferior layers as follows. The main layer is composed of MoSi2, the two phases＇ transitional layer consists of NbSi2 and a few NbsSi3 and the diffuse layer is composed of NbsSi3. The dense amorphous glass layer formed on the surface at high temperature oxidation circumstance can effectively prevent the diffusion of oxygen into coating.     

Effects of Sc and Mn on microstructures and mechanical properties of Mg-Gd alloy

Two alloys of Mg-12.4Gd and Mg-12.5Gd-0.8Sc-1.4Mn were prepared. Hot extrusion and T5 heat treatment were conducted, and then the mechanical properties of the two alloys were tested at room and high temperatures. The effects of Sc, Mn on the microstructures of Mg-12.4Gd were investigated by optical microscopy, scanning electron microscopy and transmission electron microscopy. The results demonstrate that after hot-extrusion the alloying with Sc, Mn can efficaciously refine the grains of Mg-12.4Gd alloy; and increase the elongation at room and high temperatures after T5 heat treatment. But the strength at high temperature is not obviously improved.