半绝缘砷化镓中碳含量对热稳定性的影响

本文报导了LEC法半绝缘砷化镓单晶中含碳量对SI-GaAs热稳定性的影响。在800℃以上退火,发现当晶体中C含量大于1.5×10~(16)cm~(-3)时,SI-GaAs的热稳定性变差;而C含量小于5×10~(15)cm~(-3)时,通常表现出良好的热稳定性。     

乙烯基三甲基硅烷等离子体聚合反应历程

应用色谱—质谱(GC-MS)及裂解色谱-质谱(PGC-MS)测定了乙烯基三甲基硅烷等离子体聚合反应中的气体冷凝物及聚合物,研究推导了等离子体聚合反应历程。单体在气相中被电子撞击,然后扩散到基底,在基底发生链增长和链终止反应。     

Highly compact AC-AC converter achieving a high voltage transferratio

This paper reports a new, highly integrated modular design approach for pulsewidth-modulation AC-AC converters based on a modular phase-bank structure. Novel high-power 3-in-1 integrated bi-directional power modules (IBPM) rated at 1200-V AC and 150 A and the 3-to-1 phase bank circuits have been successfully developed, fabricated and tested. This enables the modularity design of the multiphase converter systems and reduces the critical parasitic inductance. A theoretical analysis of the IBPM's silicon utilization for this new breed of direct power converters has been outlined. A lab prototype at medium power level has been successfully designed, implemented, and tested with good results. A nearly 460-VRMS out voltage at a 1:0.955 voltage transfer ratio, which, perhaps, is the highest performance reported so far in the literature, has been achieved by the novel two-side modulation control system. The converter-fed AC motor system is able to operate over the 0-240 Hz range with inherent regenerative capability and four-quadrant operation. Potential industrial applications are also briefly highlighted in this paper     

电流模精密整流电路

由电压型运算放大器组成的精密整流电路要严格地匹配电阻才能获得精密全波整流波形．本文给出一种具有CCⅡ电路特性由运算放大器AD844所构成的电流模精密整流电路．无需匹配电阻就可输出良好的精密全波整流波形．且具有输入电压范围大，频带宽等特点．     

油田勘探数据中心及辅助支持系统研究

文章简要介绍胜利油田近年来致力于勘探数据中心建设及辅助支持系统研究的背景、主要研究内容及进展情况,探讨了石油勘探行业在信息化时代利用先进的数据管理理念和技术对勘探工作提供数据支持和应用支持的尝试,对于其它油田勘探行业具有一定的借鉴意义。     

2,6-二甲基萘生产技术进展

概述了国外2，6-二甲基萘生产技术现状，详细介绍了ExxonMobil公司2，6-二甲基萘的工艺路线和日本神户制钢所的提纯方法，指出了实现我国2，6-二甲基萘工业化生产应注意的问题。     

水利工程施工测量的探讨与研究

探讨水利工程施工过程中测量工作所起的作用，并对控制测量和施工放样各个过程中的细节以及技术问题进行了探讨和研究。     

Ziegler-Natta烯烃聚合催化剂进展

综述了Ziegler-Natta催化剂在乙烯聚合和丙烯聚合方面的研究开发现状，重点介绍了采用新型二醚化合物作为内给电子体的丙烯聚合催化剂的进展。随着合成树脂向功能化方向发展，开发综合性能优越的新型催化剂及给电子体将是今后的研究方向。     

Fine-line conductor manufacturing using drop-on demand PZT printingtechnology

An emerging selective metallization process to fabricate fine-line conductors based on drop-on-demand (DOD) ink jet printing and novel nano-particle fluid suspensions (NPFS) was studied. The suspensions consist of 1-10 nm silver or gold particulates that are homogeneously suspended in an organic carrier. A piezo-electric droplet generator driven by a bipolar voltage signal is used to dispense 50-70 μm diameter droplets traveling at 1-3 m/s before impacting a compliant polyimide substrate. The deposit/substrate composite is subsequently processed at 300°C for 15 min to allow for complete evaporation of the carrier and for sintering of the nano-particles, thereby yielding a finished circuit interconnect. Test vehicles created using this technique exhibit features as fine as 120 μm wide and 1 μm thick with resistivities on the order of 3.5×10^-5 Ωcm. The circuitry performed well under environmental conditioning. As expected, repeatability of circuitry fabrication showed sensitivity to the generation of steady, satellite-free droplets. In an effort to generate droplets consistently, it is essential to develop a strong fundamental understanding of the correlation between device excitation parameters and dispensed fluid properties, and to resolve the microrheological behavior of the NPFS when flowing through the droplet generator     

PP-g-MAH对PA6/PP/TLCP三元共混物的增容改性作用

研究了PP-g-MAH对PA6／PP／TLCP三元共混体系的增容作用以及对共混物流变性能和力学性能的影响。通过共混物的DSC、SEM、POM、流变性能和力学性能测试，结果表明，PP－g-MAH对共混体系有明显的增容作用，共混物的力学性能（拉伸强度和冲击强度）得到提高；由于TLCP的加入，共混物的熔体粘度大大低于PA6的熔体粘度。