WDST-G型容错式双微机电液调速器

本文提出一个采用硬件冗余与软件容错技术研制的双微机电液调速器.该电液调速器采用标准总线与小板功能模块式结构,变结构变参数控制器算法,软件检错容错技术.实际运行结果表明,调速器工作可靠,性能优良,是大中型水轮机-发电机组调速器微机技术改造的一种有效方案.     

利用平面投影特性 提高学生解题能力

本文利用投影几何学中平面的投影规律，结合切割型平面立体讨论了相似形图形观察判断方法在读图、画图中的具体应用。该方法简单、易行。     

利用啤酒废糟发酵生产菌体蛋白饲料的研究

记述了利用啤酒废糟为原料，经多种微生物发酵生产菌体蛋白饲料的工艺及过程。发酵后的饲料价廉质优，是牲畜理想的精饲料。     

LAN与ISDN互连技术研讨

本文分析了 LAN 与 ISDN 互连的必要性,互连的结构与要求,以及互连的有关标准,着重探讨了 LAN 与 ISDN 互连技术方案,并提出了网关设计应考虑的问题。     

加快现代化城市进程的探索

分析了加快现代化城市进程中产生的人口、土地、环境、资源合理利用方面的矛盾，在应用超前、创新的意识来规划设计城市，遵循可持续发展战略建设经营性的“数字城市”，利用地理信息系统来管理现代化城市方面进行了探索。     

泥浆工程设计专家系统开发与应用

论述了泥浆设计专家系统的研制目标，关键技术以及该系统开发策略、总体方案和技术措施。对所形成系统的特点和初步应用效果作了简析。     

Screening of the interacting proteins with NifA in <Emphasis Type="Italic">Azospirillum brasilense</Emphasis> Sp7 by the yeast two-hybrid system

NifA in AzospiriUum brasilense plays a key role in regulating the synthesis and activity of nitrogenase in response to ammonia and oxygen available. In this work we used the yeast two-hybrid system to identify the proteins that interact with NifA. The nifA gene was fused to the yeast two-hybrid vector pGBD-C2, and three A. brasilense Sp7 genomic libraries for use in yeast two-hybrid studies were constructed. Screening of the libraries identified four clones encoding proteins that interact with NifA. The confirmation of the interactions of each gene product of the four clones and NifA were carried out by exchanging the vectors for nifA and the four clones and by mutageneses of the four clones with shift reading frame experiments in yeast two-hybrid studies. DNA sequence analyses showed that two clones encode proteins containing PAS domains that play an important role in signal transduction. One clone has high similarity with the fhuE gene of Escherichia coli, whose gene product is involved in iron uptake and transportation, and the other clone encodes an unknown protein.     

Thermal degradation of BaAl2Si2O8：Eu2＋ phosphor excited by near ultraviolet light

Eu2+ doped BaAl2Si2O8 phosphor was synthesized by one-step calcination of precursors that were prepared by chemical co-precipitation.The thermal degradation properties of BaAl2Si2O8:Eu2+ were investigated by photoluminescence,lifetime and chromaticity coordinate measurements.BaAl2Si2O8:Eu2+ is efficiently excited by incident light of 250-400 nm,which matches the emission of near ultraviolet LED chips well.BaAl2Si2O8:Eu2+ exhibits broad blue emission at 470 nm because of the 4f65d1-4f7(8S7/2) transition of Eu2+ ions,and the emission band shows an unusual blue shift with bandwidth broadening and emission intensity decreasing as the annealing temperature is increased.The luminescence decay and CIE chromaticity coordinates of BaAl2Si2O8:Eu2+ were determined to investigate its application in white LEDs.     

Cu和La对Al-12.6Si合金微观组织和性能的影响

研究了La加入量为0.3%时,铜质量分数(0.3%,0.8%,1.3%,1.8%和2.5%)对共晶铝硅合金(Al-12.6Si)微观组织和力学性能的影响.结果表明:当La的加入量为0.3%时,共晶硅由片状和针状变为点状和短棒状,达到了完全变质的状态.随着铜加入量的增加,合金中的Al2Cu相的数量增多、尺寸增加,合金的抗拉强度和硬度逐渐增大,延伸率有所下降;当Cu加入量为2.5%时,Al-12.6Si-2.5Cu-0.3La合金的抗拉强度为241.4MPa,延伸率为4.82%,硬度为83.9HV,与Al-12.6Si合金相比这些力学指标分别提高了58.1%,41.8%和30.9%,合金的力学性能...