Gas chromatographic thermodynamics on hydration processes of magnesium chloride with low water

1　INTRODUCTIONMagnesiumchlorideisabasicmaterialforchem icalindustry ,andithaswideapplicationsinmetallur gy,architecturalmaterialandtextileindustry .Itisalsoamaterialforfire resistantproducts ,cryogenandcompoundfertilizerproductions[1] .Thefullydehy dratedmagnesiumchlorideisagoodmaterialforelec trolyticmetalmagnesium production .Becausemag nesiumchloridehasastrongadsorptiveability ,itisalsousedasadryingagent .Manysuccessfulworkshavebeendoneonthedehydrationofbischophite[2 10 ] .Butinfact,…     

AB_5型贮氢合金P－C关系的人工神经网络研究

本文利用人工神经网络方法研究了ＡＢ５型贮氢合金的Ｐ－Ｃ曲线、平台宽度和平台压力等，并取得了满意的结果，表明人工神经网络可用于贮氢材料的设计     

Fine grinding of silicon wafers: a mathematical model for the chuck shape

Fine grinding of silicon wafers is a patented technology to manufacture super flat semiconductor wafers cost-effectively. Two papers on fine grinding were previously published in this journal, one discussed its uniqueness and special requirements, and the other presented the results of a designed experimental investigation. As a follow up, this paper presents a study aiming at overcoming one of the technical barriers that have hindered the widespread application of this technology, namely, the difficulty and uncertainty in chuck preparation. Although the chuck shape is critically important in fine grinding, there are no standard procedures for its preparation. Furthermore, the information on the relation between the set-up parameters and the resulting chuck shape is not readily available. In this paper, a mathematical model for the chuck shape is first developed. Then the model is used to predict the relations between the chuck shape and the set-up parameters. Finally, the results of the pilot experiments to verify the model are discussed.     

Oxidation of Si-based ceramics in the presence of alkali halide vapors

Nonoxide silicon-based ceramics owe their oxidation resistance to the formation of a thin silica film that separates the ceramic from oxidizing environments. This silica film can be fluxed by alkali oxides to form low-melting alkali silicate corrosion products that do not provide protection. Alkali chlorides and other halides have sufficiently high vapor pressures that silica fluxing can occur without the formation of a condensed halide salt. The rates of oxidation of Si, SiC, and Si₃N₄ are influenced by the composition of gas mixtures containing these species.     

纳米热喷涂技术的研究现状与展望

介绍了纳米热喷涂结构涂层的组装、涂层结构与性能等方面的研究现状，并展望了纳米热喷涂技术的发展前景。     

含B2O3渣系的热力学计算模型

根据炉渣结构的共存理论和相图，推导了ＣａＯＢ２Ｏ３和ＦｅＯＦｅ２Ｏ３Ｂ２Ｏ３渣系的热力学计算模型。结果表明：（１）理论计算的ＣａＯＢ２Ｏ３渣系的作用浓度ＮＣａＯ及ＮＢ２Ｏ３与实测的活度ａＣａＯ及ａＢ２Ｏ３一致；（２）理论计算的ＦｅＯＦｅ２Ｏ３Ｂ２Ｏ３渣系的氧化能力ＮＦｅｔＯ与实测的炉渣ＦｅｔＯ的活度值相符合。这说明本文提出的热力学计算模型是合理的。     

规划水资源论证技术要求探讨——以深圳石岩总部经济园区规划为例

2010年,水利部启动了规划水资源论证的试点工作并出台了试行技术要求。规划水资源论证把水资源管理的源头从建设项目向前推进至规划阶段,体现了"从源头和过程控制"的理念。以深圳石岩总部经济园区改造专项规划水资源论证为例,对园区规划水资源论证的内容、方法和要求进行了实例探讨,为规划水资源论证的编制提供参考。     

面向决策的信任融合模型研究

信任关系模型无论是在现实生活中还是在开放网络中都是最复杂的社会关系模型之一,是一个很难度量的抽象的心理认知,因为它涉及假设、期望、行为和环境等多种因素。借鉴以往的研究经验,综合考虑多种信任关系要素,提出了一种新的面向决策的信任融合模型。该模型基于直接信任度、间接信任度和信誉值的演化,依据信任融合获得决策信任度,为主体评判下一次的交互提供依据。为了证明信任融合模型的有效性,假设客体在ω类活动中以期望为PωX的概率从事该项活动。实验证明,信任融合模型得到的决策信任度和客体可信度的差异明显小于直接信任度、间接信任度或信誉值。     

基于奇异谱分析的DGPS浮标海面高测量误差研究

在高度计绝对定标实验中,利用差分GPS(Differential GPS,DGPS)浮标进行现场海面高测量得到的海面高(Sea Surface Height,SSH)序列之中,除了包含有由风浪引起的高频噪声外,还包括了仪器误差造成的影响。前者可通过低通滤波方式消除,而后者由于是全频段的白噪声,不能通过低通滤波的方式消除。通过研究奇异谱分析(Singular Spectrum Analysis,SSA)的方法,确定了嵌入维数和截断长度的选取准则,并对其进行仿真,验证了该方法在消除海面高序列的仪器误差噪声中的有效性,同时也验证了嵌入维数和截断长度选取准则的有效性。最后,利用该方法处理了某次DGPS浮标实验获得的海面高序列,处理结果与原始序列相比较为平滑,且在精度上有一定的改善,验证了奇异谱分析方法的有效性。