锰铁中硅含量快速测定方法研讨

试样用硫酸分解后，加入氢氟酸，使硅成为硅酸全部进入溶液，过量的氢氟酸用硼酸络合，用硅钼蓝光度法测定锰铁中硅含量。     

锰铁中硅含量快速测定方法研讨

试样用硫酸分解后 ,加入氢氟酸 ,使硅成为硅酸全部进入溶液 ,过量的氢氟酸用硼酸络合 ,用硅钼蓝光度法测定锰铁中硅含量 .     

硅钼棒表面"冒泡"现象的研究

通过对硅钼棒的基体及表面的微观结构和微区成份分析,指出造成硅钼棒表面在使用中产生"冒泡"现象的原因,并提出相应的解决方法.     

硅基光电子材料的研究

综述了硅基发光材料的研究新进展，分别以发光多孔硅、多孔碳化硅、纳米硅薄膜和发光硅基超晶格为例，分析了讨论了其准备、物理特性及发光机理。     

多孔硅发光

多孔硅是一种硅基纳米材料，硅基材料的研究是实现光电集成的关键，多孔硅的发光研究为硅基发光研究开辟了新的应用研究领域．对多孔硅发光的意义、多孔硅的各种制备方法进行了的报道，论述了多孔硅的微观结构、多孔硅的光致发光机制及多孔硅的光致发射光谱．     

硅钒钼杂多酸在硫酸和乙醇介质中的极谱行为及应用

在硫酸－钡－钼酸铵－乙醇体系中,硅的化合物有一个十分尖锐、灵敏的配合物吸附波,其峰电位为－0．44V(vs.SCE）,峰电流与硅浓度在0－12μg/50ml范围内呈线性关系,检出限为0．02μg/50ml,对极谱波的性质及配合物组成进行了研究,用于土壤及水样中硅的测定,取得满意结果。     

硅对水稻幼苗镉的解毒作用及其机制研究

采用溶液培养方法,研究了硅对镉胁迫下水稻幼苗的解毒效应及其机制.Cd2+(4 mg·L-1)处理4 d后水稻幼苗出现明显的毒害症状,生物产量显著降低.然而,在镉溶液中添加30～180 mg·L-1SiO2后镉毒害症状减轻,生物产量显著提高.硅处理不仅极显著减少水稻含镉量和镉的吸收量,而且减少镉累积在地上部、地下部以及在叶、茎中的比值.硅处理后细胞壁中的镉占根中镉的比例增加,而镉在共质体和质外体中的比例显著减少.硅处理还使进入根细胞自由空间的镉更多地转化为交换态,使交换态镉与游离态镉的比值升高.这些结果表明,硅通过抑制水稻对镉的吸收和镉的向上运输,而增加镉在细胞壁中的沉积和自由空间中交换态镉的比重等途径缓解镉对水稻的毒害.     

二羰基(五甲二硅基)环戊二烯基三苯基膦(2-环氧亚戊基)钼盐的合成

通过三羰基（五申二硅基）环戊二烯基（3-溴丙基）钼和三未基瞬反应，形成二羰基（五甲二硅基）环戊二烯基三本基膦（2-环氧亚戊基）钼阳离子的溴盐。用四苯硼钠处理这个溴得到其四苯硼盐。并以元素分析、IR和1HNMR谱表征了它们的结构。     

硅基光电子材料的研究

综述了硅基发光材料的研究新进展,分别以发光多孔硅、多孔碳化硅、纳米硅薄膜和发光硅基超晶格为例,分析讨论了其制备、物理特性及发光机理.     

浅析碳硅性质的差异性

本文从结构观点和热力学观点,从微观结构到宏观性质，从现象到实质对碳、硅性质做了系统的分析比较，揭示了它们的差异性。通过理论分析及实例印证，对有机界和无机界的“主宰”元素－－碳和硅作了深入浅出的描述。     

分光光度法测定不同钼矿样品及矿渣中钼的含量

根据钼在460nm处产生最大吸收峰,用分光光度法测定其吸光度,绘制钼的标准曲线。钼测定的线性范围为40-360μg/50mL,测定了多种钼矿及矿渣中钼的含量。     

安徽省水稻土有效硅含量分布及影响因素

成土母质是影响土壤有效硅水平的主要因素,不同母质发育的水稻土有效硅平均含量顺序为：黄土性古河湖相沉积物＞近代黄泛＞淮河冲积＞石灰岩＞湖积物＞下蜀黄土＞长江冲积＞紫色砂页岩和第四纪红土＞板页岩和酸性结晶岩。土壤pH值和土壤有机质含量与土壤有效硅呈极显著正相关。安徽省水稻土有效硅含量不同地区差异很大,淮北平原＞江淮丘陵岗地＞沿江平原＞皖西山地＞皖南丘陵山地．     

基于B／S的网络营销分析系统的设计与实现

网络营销分析系统的构建为企业网络营销决策提供科学依据．在介绍网络营销分析的主要内容、网络营销分析系统的功能及设计方法之后,详细说明了网络营销分析系统关键模块的实现．     

pH值对土壤硅素吸附特性的影响

本文采用等温吸附法研究了安徽省16种土壤对硅的吸附作用,研究了三种pH值条件下土壤对硅吸附特征,结果表明:土壤对硅的吸附与土壤活性铁、活性铝含量呈极明显正相关,相关系数分别为0.8572和0.6776.在加入硅溶液pH值3-9范围内,平衡液硅浓度随溶液pH值升高而降低.     

The triarchic theory of intelligence and computer-based inquiry learning

Sternberg's (1985) triarchic theory of human intelligence distinguished among three types of intellectual abilities: analytic, creative, and practical. Our study explored the relationships between student abilities and the cognitive and attitudinal outcomes that resulted from student immersion in a computer-based inquiry environment. In particular, we examined outcome variables related to content understanding, problem solving, and science-related attitudes. Results indicated that more practical abilities predicted greater content understanding and transfer of problem-solving skills. High analytic abilities were predictive of content understanding but not transfer of problem-solving skills. High creative abilities predicted problem solving, but were not predictive of performance on content understanding. In terms of science-related attitudes, students who were dominant in practical abilities had significantly more positive posttest attitudes than those dominant in analytic abilities. The results from this study were used to make recommendations regarding design principles used in the subsequent development of computer-based inquiry environments.     

SiO2负载磷钨酸催化合成丙酸苄酯

研究了SiO2负载磷钨酸催化合成丙酸苄酯的反应,考察了催化剂负载量、催化剂用量、苯甲醇／丙酸摩尔比、反应时间、反应温度等因素对酯化反应的影响。结果表明,SiO2负载磷钨酸是催化合成丙酸苄酯的良好催化剂,优化条件下,酯化收率达76.3％,催化剂可重复使用。     

Development of a miniature silicon wafer fuel cell using L-ascorbic acid as fuel

In the current studies a miniature silicon wafer fuel cell （FC） using L-ascorbic acid as fuel was developed. The cell employs L-ascorbic acid and air as reactants and a thin polymer electrolyte as a separator. Inductively coupled plasma （ICP） silicon etching was employed to fabricate high aspect-ratio columns on the silicon substrate to increase the surface area. A thin platinum layer deposited directly on the silicon surface by the sputtering was used as the catalyst layer for L-ascorbic acid electro-oxidation. Cyclic voltammetry shows that the oxidation of L-ascorbic acid on the sputtered platinum layer is irreversible and that the onset potentials for the oxidation of L-ascorbic acid are from 0.27 V to 0.35 V versus an Ag/AgCl reference electrode. It is found that at the room temperature, with 1 mol/L L-ascorbic acid/PBS （phosphate buffered solution） solution pumped to the anode at 1 ml/min flow rate and air spontaneously diffusing to the cathode as the oxidant, the maximum output power density of the cell was 1.95 mW/cm^2 at a current density of 10 mA/cm^2.     

Effect of carbon, silicon, and manganese content on mean flow stress at elevated temperature

Ten studied steels including different carbon content, silicon content, and manganese content were deformed in compression over a temperature range of 600 C to 1 000 C at the strain rate of 1 s1. The curves of the mean flow stress-deformation temperature were drawn up. The mean flow stresses of higher carbon content steels decreased continuously as the applied deformation temperature increased in the whole temperature range, while the mean flow stress of lowest carbon steel displayed an abrupt drop near the two phases region. The reason for the abrupt drop phenomena was explained as the result of phase transformation. The mean flow stresses of steels with high silicon content and low manganese content also have this phenomena.     

分析哲学对主体性哲学的半截子超越

分析哲学通过对命题意义,即可传达性的强调,以及对康德的先验范畴所进行的语义学改造,实现了对主体性哲学的某种超越。然而,分析哲学虽然否定了作为主体性哲学之前提的关于主客体之间的对立或者人的内部空间与外部空间的对立的假定,但却保留了康德哲学中的形式与内容的对立。也就是说,分析哲学对主体性哲学的否定是不彻底的,并没有放弃对绝对确定性的寻求,仍保留有康德哲学的残余,只能说是对主体性哲学的半截子超越。     

主轴纯径向跳动误差对加工工件形成误差形状浅析

本文所述内容是从空问解析几何角度来分析主轴径向跳动误差对加工工件形成的误差形状。是对山东机械工业学校赵元吉教授主编的《机械制造工艺学》第153页所述内容的探析,以便于人们从空问几何角度来理解这种误差的形状。