多孔材料的研究进展

本文总结了2010~2013国际和国内在无机微孔材料领域的研究进展和亮点,比较了国内外研究的进展,展望了本领域的发展趋势。全文共引用参考文献87篇。     

ICP-AES法同时测定锰矿石中铁、铝、钛、钙、镁、磷、钡、铅的含量

锰矿石样品用HNO3-HF-HClO4酸溶除硅后,对采用ICP-AES法测定其中的铁、铝、钛、钙、镁、磷时,同时测定钡、铅的相关条件进行了试验。主要对酸溶样能否分解重晶石或天青石等含钡矿物进行了探讨,测定了3个国家级标准样品。测定结果与标准值吻合。用标准加入法测得的钡和铅的回收率分别为96．0％-100．5％,97．1％～100．0％。用该法对含钡量较高的澳大利亚锰矿进行分析,测定结果的相对标准偏差为0-82％,并将测定结果与X荧光光谱法测定结果进行了比对。     

《中国惯性技术学报》(1996～2000年)刊载论文的统计分析

对《中国惯性技术学报》1 996～ 2 0 0 0年内刊发的论文进行了分类统计 ,从刊载的论文量、论文内容和论文作者的地域分布以及作者署名情况、文献引用等几个方面进行了分析 ,简要勾画出了我国惯性技术领域科技论文产出力的分布和影响力的概貌 ,最后进行综合评价并提出了几点建议。     

New Method of Generating Exact Inflationary Solutions in Generalized Einstein Theories

We discuss the general approach to finding exact inflationary solutions in generalized Einstein theories. These solutions are found by taking the Hubble parameter directly as a function of the field and then determining the evolution of the expansion scale factor and the potential from it. This method allows the full dynamic behavior of the field to be investigated in terms of the function H() without needing to assume that friction terms in the field equations dominate or that the field's kinetic energy is negligible.     

Reversible phase transformation-type electrolyte based on Dawson-type POM and simple quaternary ammonium salt

A novel kind of organic–inorganic material, (TOAMe)₇[In(H₂O)P₂W₁₇O₆₁] (TOAMe?=?trioctylmethylammonium), is synthesized as white oily product from polyoxometalate-type ionic liquid with Dawson structure and simple quaternary ammonium ionic liquid. It was characterized by IR, UV, X-ray diffraction, and thermogravimetric–differential thermal analysis. The determination of (TOAMe)₇[In(H₂O)P₂W₁₇O₆₁] shows that it has a high conductivity with 1.25?×?10^?4 S cm^?1 at 24 °C. In addition, its electrochemical properties were also investigated by the cyclic voltammetric studies. And then we released that the indium in the complexes can undergo reduction in dimethylformamide, which is unlikely in the water solution as a simple hydrated ion.     

Brookite-supported highly stable gold catalytic system for CO oxidation

A significant enhancement of the gold catalysis stability against sintering has been achieved using brookite as a catalytic support.     

遗传算法在网架结构优化中的应用

综合考虑网架杆件的强度、刚度、稳定性、最小截面尺寸及结构挠度等约束条件,建立了网架结构离散断面优化的数学模型,应用遗传算法对其进行求解．算例表明,遗传算法可用于网架结构的优化设计,且优化结果可靠．     

航空有机玻璃高阶弹性常数超声测定

从有限变形弹性动力学理论出发,认为超声在经历初始静态形变的各向同性弹性体中的传播是叠加在有限变形上的微小扰动,假设应变是应力的三次函数,导出以材料高阶弹性柔度系数为参数的超声纵波传播速度与初始应力关系式,针对YB-3航空有机玻璃试件,通过一组应力-速度测量数据,利用非线性最小二乘法优化方法确定了该材料的前四阶弹性柔度系数,并对实验及模拟计算结果进行了讨论。     

One-step controllable synthesis for high-quality ultrafine metal oxide semiconductor nanocrystals via a separated two-phase hydrolysis reaction

A one-step synthesis method is described to prepare high-quality ultrafine inorganic semiconductor nanocrystals via a two-phase interface hydrolysis reaction under hydrothermal conditions. With the synthesis of ZrO2 quantum dots as an example, we show that the prepared nanocrystals have good monodispersity and high crystallinity, as well as other related superior properties, e.g., strong photoluminescence and excellent photocatalytic activities. Also the crystal size can be conveniently adjusted in the range below 10 nm through controlling the reaction temperature. Besides that, this method also shows other distinct advantages compared with other methods reported previously. First, the preparation process is simple and cheap and does not contain any complicated posttreatment procedure. Second, products (without coating) can be collected from the organic phase which effectively avoids grain aggregation induced by the capillary concentration in the water environment. Third, the production yield is very high (almost 100%) and the organic and water phases after reaction can be easily recycled for next reaction. Therefore, it provides a promising strategy for the large-scale industrial production of different kinds of high-quality inorganic nanocrystals.     

跨导系数Kn的可变应用

IC设计中,为计算方便,设计者往往将K_n作为常量使用。这与实际情况不符并会导致设计的电路进行仿真时的结果总与性能指标有一定的差距。本文在仿真基础上,探讨并解释K_n的影响因素。最后针对实际使用的情况,提出在模拟电路设计的定量计算时应合理选取K_n的分区选择法。