环烷酸季戊四醇脂的合成

介绍了用氧化亚锡非酸性催化剂催化合成环烷酸季戊四醇脂的方法，通过讨论醇酸摩尔比、催化剂用量、反应时间、反应温度等因素对该脂化反应的影响，从而确定了适宜的工艺条件．     

聚磷嗪化合物的合成及其阻燃性能的研究

文章以六氯环三磷嗪为原料通过亲核取代、还原等反应合成了2.2-二苯胺基-4.4.6.6-四对羟甲基酚氧基三聚磷嗪,探索了各步化合物的合成、分离方法,通过元素分析、红外光谱和核磁共振谱对合成的化合物的结构进行了表征.将该化合物加入到低压聚乙烯中对其进行阻燃改性,进一步对所合成的化合物的阻燃性能进行了研究,结果表明该化合物具有明显的阻燃效果.     

DNA synthesis in the nuclei of differentiating muscle fibers of the silkworm,Bombyx mori L.

Summary Incorporation of³H-thymidine (³HTdr) into the nuclei of myofibril-containing myofibers of larvae of the silkworm,Bombyx mori, was shown by means of light microscope (LM) and electron-microscope (EM) autoradiography. The number of DNA-synthesizing myonuclei attains 42% 12–18 h after each molt. Thus in the developing silkworm DNA replication and myofibrillogenesis are coexisting and not mutually exclusive processes as is the rule in vertebrate somatic myogenesis.     

Studies on a selena-aza-crown ether: Synthesis and catalytic behavior in hydrosilylation

The synthesis of a new type of selena-aza crown ether-6-(4-nitrobenzyl)-1,4,7,10-selenatriazacyclododecane (L) derivated from phenylalamine, and its platinum (II) complex was described. The catalytic activity of this complex for the hydrosilylation of olefins by triethoxysilane was investigated. Supported by the Chinese National Natural Science Foundation and the Doctoral Special Grant from the State Education Commission of China. Xu Wei: born in 1969, Ph.D. graduate student     

BBr3的合成

在合成BBr3的方法中,元素硼溴化法是比复分解法和碳化硼溴化法容易实现的合成方法.在制备元素硼的方法中,Mg—B2O3还原法是比Na-B2O3还原法、Al—B2O3还原法和Al-硼砂还原法操作方便且产率较高的合成方法.采用聚四氟乙烯管道可以对溴和BBr3取得满意的防腐和密封效果,冰盐浴可以实现高温BBr3气体的冷凝.     

Optimum linear array of an optical aperture synthesis telescope

Measuring out successively the degree of coherence of the source produced by any couple of the small apertures via rotating an array composed of the small aperture telescopes, and synthesizing them into the (u, v) coverage of the source, the brightness distribution of the source can be obtained by the inverse Fourier transform of the degree of coherence with much higher resolution than from a single telescope. This article discusses the arrangements of the small apertures in the linear array, and found a method to decide the quality of the arrangements. the judgment factor ε is introduced to calculate the arrangements in quantity. There are 1.5×10¹¹ possibilities for 11 apertures. Therefore, the computer procedures are programmed to select the optimum arrangements. The effect of the simulation of the aperture synthesis is given for the linear array. The simulation method can also be used in the nonlinear arrays.     

A Sultone Route to the Antileukemic 1 ,10-Seco-Eudesmanolides （ - ）-Eriolanin and （ - ）-Eriolangin

The highly oxygenated 1,10-seco-eudesmanolides （ - ）-eriolanin （ 1 ） and （ - ）-eriolangin （2） isolated from the plant Eriophyllum lanatum （Asteraceae） inhibit the growth of the human KB tumor cell line in vitro and additionally display a significant antileukemie activity in vivo in mice （Scheme 1 ）. Using novel methods for the synthetic elaboration of sultones, the first enantioseleetive total syntheses of 1 and 2 have been accomplished, which also established the hitherto unknown absolute configuration of these natural produets.     

一类复合调制信号的脉冲压缩及旁瓣抑制

线性调频信号和二相编码信号在脉冲压缩雷达系统中使用较为广泛。分别对其进行分析后推导出一类线性调频 二相编码复合调制信号的时域表达式,使其兼有这两种信号的特点。对其进行仿真的结果表明,该复合调制信号容易产生并处理,其匹配滤波结果对多普勒频移也不敏感,但由于该信号的特殊性,常规的窗函数无法对其进行旁瓣抑制。采用了网络综合法抑制其旁瓣,效果十分理想。