减四线馏分油的热容测定及热力学性质研究

测试了减四线馏分油低温热容 ,并进行了热重 /微分热重 (TG/DTG)和差示扫描量热 (DSC)分析。在 80～ 373K温区 ,用高精度全自动绝热量热仪测定了热容值 ,用最小二乘法对实验测量值进行拟合 ,建立了热容随温度变化的多项式方程。从减四线馏分油的热容曲线 ,发现该样品从固相变为液相 ,存在着两个熔化峰 ,分别为 2 94 .17K和 331.5 7K ,后者为熔化主峰。以此为熔点 ,计算出熔化焓、熔化熵分别为 88.19J/g和0 .2 6 6 0J/ (K·g)。从TG/DTG分析曲线发现该油样在 5 73K开始失重 ,到 6 6 3K失重速度达到最大 ,可能是由于样品蒸发引起。从DSC分析曲线 ,发现样品除 333K附近出现熔化吸热峰外 ,在 5 73K到 873K范围还出现一系列吸热峰 ,可能与样品的蒸发和热分解有关。     

Reduction kinetics of Fe<Subscript>2</Subscript>MoO<Subscript>4</Subscript> fine powder by hydrogen in a fluidized bed

Iron molybdate (Fe₂MoO₄) powders with an average particle size of 100 μm were reduced by hydrogen using a fluidized-bed batch reactor in the temperature range of 923 to 1173 K. The extent of the reaction was followed as a function of time by gas chromatography. The fluidizing-gas velocity was set at about 1.5 times the minimum fluidization velocity. The ratio of the height of the static bed to its diameter is about 1. Under the prevailing experimental conditions, it was found that the chemical reaction was the rate-controlling factor. The activation energy for this process was 158±17 kJ/mol. The crystal size of the Fe₂Mo powder produced at lower temperatures was in the nanometer range, indicating the possibility of mass production of alloys and intermetallics in the nanorange, using a fluidized bed.     

唐钢ER70S-6焊丝钢的生产工艺研究及质量分析

介绍了唐钢ER70S-6焊丝钢的特点，对盘条质量进行了分析。对该钢化学成分、冶炼和轧制工艺进行了优化研究，使其综合性能明显改善。     

聚氨酯/聚(甲基丙烯酸甲酯-甲基丙烯酸丁酯)互穿聚合物网络聚合物的阻尼性能

采用本体聚合法合成出一系列阻尼性能良好的聚氨酯/聚(甲基丙烯酸甲酯-甲基丙烯酸丁酯)(PU/P(MMA-BMA))互穿聚合物网络(IPN)聚合物,通过动态力学分析方法表征了PU/P(MMA-BMA)IPN聚合物的阻尼性能。探讨了加入催化剂、高温后处理、交联剂用量及PU与P(MMA-BMA)的质量比对PU/P(MMA-BMA)IPN聚合物阻尼性能的影响。实验结果表明,经高温后处理后,以二月桂酸二丁基锡为催化剂、交联剂二乙烯基苯用量(占MMA和BMA的摩尔分数)为1.5%、PU与P(MMA-BMA)的质量比接近1或小于1时,PU/P(MMA-BMA)IPN聚合物具有良好的阻尼性能。     

基于COM/DCOM技术的电信网络管理

本通过对TMN(电信管理网)思想以及COM／DCOM编程原理的分析，将COM／DCOM的功能特点与TMN电信网络管理的基本要求有机地结合在一起，提出了运用COM／DCOM技术建立TMN的基本设想，其原理是，将电信网的各种网元抽象为COM组件对象，组件对象实时反映所对应网元的各种特征数据，运用DCOM通信机制对这些组件对象及其特征数据进行监控管理，从而达到管理网元之目的。COM／DCOM的面向对象及分布式属性、操作系统和平台无关性、它的事件通知功能、高效的通信机制及其网络安全技术，均符合电信管理网络的功能要求。     

华北油田隐蔽油藏勘探实践与认识

随着勘探的不断深入,华北油田富油凹陷构造油藏的勘探程度越来越高,勘探对象日趋复杂,勘探难度越来越大。面临勘探现状,华北油田认真分析勘探形势,立足资源基础,解放思想,积极转变勘探观念,有意识地加强隐蔽油气藏的深入研究与勘探,先后在冀中坳陷的饶阳凹陷、二连盆地的巴音都兰凹陷、乌里雅斯太凹陷等发现了多个规模富集的隐蔽油藏。通过隐蔽油藏的勘探实践,取得了四点主要认识、六点重要启示,对今后深化华北油田隐蔽油藏的勘探具有重要的指导作用。     

大功率速调管发射机水冷系统的设计

雷达发射机中大功率器件(如速调管)的强迫液体冷却是一种常用的冷却方式。本文根据某雷达发射机冷却系统的设计.介绍了大功率速调管发射机水冷系统的设计方法。     

一种用于卫星电视接收的FZP天线

本文用物理光学法对ＦＺＰ反射器的聚焦场、聚焦效率及偏轴扫描特性等进行初步分析，并由此提出一种使用ＦＺＰ天线实现多颗卫星信号同时接收的技术方案。原理性样机实际接收结果证实了其可行性     

Cloning and expression analysis of a novel salicylate suppressible gene, Hs-CUL-3, a member of cullin/Cdc53 family

By using a mRNA differential display technique to search for salicylate suppressible genes, we identified a cDNA in human foreskin fibroblasts, which by GenBankTM DNA data base search shows sequence homology to the recently reported cullin/Cdc53 (CUL) family genes, especially CUL-3. We have cloned the full-length human CUL-3 (Hs-CUL-3) cDNA. It encodes a 768-amino acid polypeptide and has a predicted molecular weight of 88,939. The amino acid sequence of Hs-CUL-3 shows 46% homology to that of its Caenorhabditis elegans ortholog, Ce-CUL-3, and 27 and 23% to that of Hs-CUL-1 and Hs-CUL-2, respectively. Northern blot analysis showed that phorbol 12-myristate 13-acetate increased the expression of Hs-CUL-3 mRNA in a concentration- and time-dependent manner, and this increase was inhibited by sodium salicylate. Hs-CUL-3 widely expressed in human tissues and its expression in cultured COLO205 colon cancer cells was increased when compared with that in normal colon cells. It is likely that Hs-CUL-3 is involved in cell proliferation control.     

GaN的MOVPE生长和m－i－n型蓝光LED的试制

利用自行研制的常压ＭＯＶＰＥ设备和全部国产ＭＯ源，采用低温生长缓冲层技术，在蓝宝石（α－Ａｌ２Ｏ３）衬底上获得了高质量的ＧａＮ外延层。未掺杂的ＧａＮ外延层的室温电子迁移率已达１１４ｃｍ２／Ｖ．ｓ，载流于浓度为２×１０１８。７７Ｋ光致发光谱近带边发射峰波长为３６５ｎｍ，其线宽为４ＤｍｅＶ。Ｘ射线双晶衍射回摆曲线的线宽为３６０ａｒｃｓｅｃ。用Ｚｎ掺杂生长了绝缘的ｉ－ＧａＮ层。在此基础上研制了ｍ－ｉ－ｎ型ＧａＮ的ＬＥＤ，并在室温正向偏压下发出波长为４５５ｎｍ的蓝光。