合成气合成甲醇、二甲醚的动力学研究

合成气合成甲醇、二甲醚的动力学研究韩刚周钰明（南京大学化学系．南京２１００９３））（东南大学化学化工系，南京２１００１８）在研究催化的同时，进行催化反应动力学的考察将为催化剂的工业化提供必要的实验参数，对合成气常压或加氢下合成甲醇的动力学研究已有一些...     

一类新的准谐振变换器

用一种新的恒频周期谐振开关代替脉宽调制开关变换器中的开关单元可得到一类新的准谐振变换器：恒频工作的周期准谐振变换器。该类变换器工作过程简单，分析设计容易，负载特性良好，并且克服了传统ＱＲＣ可控范围极有限的缺点。与调频工作周期准谐振变换器相比，新的ＣＦ－ＣＱＲＣ因恒频工作而具有更好的控制性能，使优化设计成为可能。     

双轴自动电子倾斜测试仪

双轴自动电子倾斜测试仪是一个高精度、大量程的角度倾斜测量仪器。本文介绍了该仪器的原理和性能,给出了技术指标和实测结果,最后阐明了它的应用领域。     

化学剂防碳酸钙垢的机理研究进展

介绍了近几年来从宏观和微观上对防碳酸钙垢的机理的研究.宏观上,防垢剂可以使热力学上不稳定的文石和六方方解石在动力学上稳定存在,并且随着防垢效果的提高,这些晶形在生成的碳酸钙垢中的含量越来越大.上述碳酸钙晶形的变化,归因于防垢剂对不同结晶过程的阻止能力.微观上,通过计算机模拟技术和先进的实验手段,揭示了防垢剂在晶体活性点上的吸附,该吸附对碳酸钙的生长和溶解均有阻止作用.同时指出,除涉及固液界面上防垢剂和碳酸钙的作用外,防垢剂对碳酸钙生长的控制还与防垢剂和溶液中成垢离子的作用有关,对此国内外论及极少.     

鄂尔多斯盆地构造与耦合成矿关系思考

目的探索多种矿产耦合成矿的盆地构造动力学问题。方法综合剖析鄂尔多斯盆地构造与油、气、煤和砂岩型铀矿等多种矿产共存富集的时空配置关系。结果鄂尔多斯盆地多种矿产相互关联、共存富集于古生界和中生界的不同地质层位，促使它们耦合成矿的时代主要发生在晚侏罗-早白垩世的燕山中晚期，主体受控于中新生代多构造演化及其关键变革时期的构造转换过程。结论探索、研究鄂尔多斯盆地中新生代构造动力学演化及其叠加转换关系，有助于客观认识多种矿产共存富集可能受控的统一盆地动力学环境及其耦合成矿效应。     

校园网建设中存在的问题及对策分析

校园网的建设可谓方兴未艾，但它又是一项复杂的系统工程，涉及教育思想、观念、教育内容、教育技术、教育艺术、教育管理、教育评价、以及办学条件设备等方面。本文就目前校园网建设中存在的问题进行分析，提出在建设校园网中的对策。     

海洋真菌杀虫活性的初步研究

对采集自浙江舟山海域底泥、福建省九龙江口红树林及福建省云霄县红树林共188株海洋真菌代谢产物的杀小杆线虫（Rhabditis sp．）和卤虫（brineshrimp）活性进行初步研究．筛选出#164菌株代谢产物对小杆线虫显示了较好的杀害活性，其LC90小于0．5mg／mL．#122菌株代谢产物对卤虫显示了较强的麻痹效应．#305菌株代谢产物对卤虫的LG。仅为75μg／mL．此外，对188株海洋真菌代谢产物的乙酰胆碱酯酶抑制活性进行研究．筛选出#229菌株代谢产物和#170菌株代谢产物具有较强的乙酰胆碱酯酶抑制活性,IC50分别为30／μg／mL和25／μg／mL．这些活性菌株具有产生杀线虫剂或乙酰胆碱酯酶抑制剂的特性．     

Construction of a genetic map with SRAP markers and localization of the gene responsible for the first-flower-node trait in cucumber (Cucumis sativus L.)

Cucumber (Cucumis sativus L.) is an annualclimber originated from the tropic rain forest area inthe south of Himalayas, which belongs to the Cucur bitaceae family. Cucumber is one of the importantvegetables in the world, and its planting area is sec ond only to that of tomato[1]. However genetics re search on cucumber obviously drops behind that of thelatter. The classic genetic map of cucumber, with sixlinkage groups, is composed of more than 100 genesfor color, morphology, and dise…     

Re-evaluation of the phylogenetic position of the genus Dexiotrichides (Protozoa, Ciliophora, Scuticociliatida) inferred from stomatogenetic and molecular information for Dexiotrichides pangi

The divisional process and systematic position of the marine scuticociliate Dexiotrichides pangi are studied. Based on both stomatogenetic data and 18S rDNA gene sequences, the phylogeny and morphogenetic characteristics of this taxon, and of other related genera, are analyzed and discussed. Both the divisionary events and the molecular biological data indicate that this speciesgenus, together with certain other genera in the Dexiotricha-complex, occupies an intermediate position between the tetrahymenids and the “typical” scuticociliate, which suggests that the Dexiotricha-like taxa should be excluded from the “true” scuticociliates. As a further contribution, the process of stomatogenesis in D. pangi can be summarized as follows: (1) The oral primordia in the opisthe are formed only by the proliferation of basal bodies in the scutica field, which subsequently develop into three membranelles, while the new paroral membrane seems to be generated by the sub-anterior portion of somatic kinety 1 (the 1st postoral intercalary kinety). The latter character exhibits a mode similar to Tetrahymena. (2) In the proter the parental membranelles are retained and remain unchanged throughout the entire division process; only the old paroral membrane is disassembled and differentiated into the anlage, which then gives rise to the new paroral membrane and the scutica of the proter. The 18S rRNA gene sequence reported here is the first one for a ciliate in the Dexiotricha-complex.     

葡聚糖的研究进展

对萄聚糖的结构、特性、测定方法、制备以及生产应用的进展进行了论述，并对萄聚糖的开发利用进行了探讨。