金属卤化物气体放电灯启动问题的探讨

本文介绍了分别改变灯内填充物含量即 NaI 和 ScI 含量的方法,探讨此变化与光源气体放电参数的关系,从而分析和研究金属卤化物灯的启动特性,从而寻求延长光源寿命的途径。     

钽掺杂的钌基厚膜电阻导电相和玻璃相颗粒尺寸效应的研究

本文报道了钽掺杂钌基厚膜电阻制备过程中导电相和玻璃相颗粒尺寸效应的实验研究结果。当导电相和玻璃相颗粒尺寸分别达到25和50nm时,电阻阻值和电阻温度系数也随之发生显著变化,并尝试根据厚膜电阻导电机理对其产生的原因进行定性的分析。     

A 22-kHz multibit switched-capacitor sigma-delta D/A converter with92 dB dynamic range

A time- and capacitor-multiplexing technique for use in a highly linear switched-capacitor multibit DAC in sigma-delta data converters is presented. The technique uses subintervals in the sample clock to deliver multiple charge packets to holding capacitors. It avoids distortion effects caused by mismatched capacitors and finite opamp gain. A five-level switched-capacitor DAC using the proposed technique was designed as part of an audio-band multibit sigma-delta D/A converter that achieved a dynamic range of 92 dB and a THD of -93 dB with a low oversampling ratio of 32. No trimming, calibration, or dynamic matching scheme was required. The five-level SC DAC has been fabricated in a 2-μm CMOS process, and testing confirmed the anticipated theoretical results     

Packaging of a 128 by 128 liquid-crystal-on-silicon spatial lightmodulator using self-pulling soldering

A self-pulling soldering technology has been demonstrated for assembling liquid crystal on silicon (LCOS) spatial light modulators (SLMs). Solder joints with different profiles and sizes are designed to provide vertical surface tension forces to control the gap accommodating the ferroelectric liquid crystal (FLC) layer in the range of a micron with sub-micron uniformity. This technology provides an automatic, batch assembly process for a LCOS SLM through one reflow process. The component designs and process optimization are described, and the first operational results are presented     

含杂质超临界-密相CO2管道输送工艺参数优化

CO_2输送作为CCUS技术实现的中间环节,承担着将CO_2从捕获地输送到封存点的重要任务,结合原油、天然气管道的经验可知,由于管道输送具有输量大、安全可靠性高、连续性强等优势,是目前最主要的CO_2输送方式。根据国外40多年的CO_2管道输送经验,由于超临界-密相CO_2具有类似于液体的高密度和类似于气体的高扩散性与低黏度,被认为是最经济的管道输送方式。以国内某油田30×10~4 t/a CCUS项目为例,采用Pipephase模拟软件对不同管径的超临界-密相CO_2管道在相同入口参数下进行模拟计算,分析研究不同管径下的管道压力、温度、密度与输送距离之间的变化规律,得出含杂质超临界-密相CO_2最优管道输送工艺参数,为后续我国CCUS项目推广和发展提供理论依据。     

Photocurrent effect on the zero-Bias dynamic resistance of HgCdTe photodiode

A new physical model is presented for the illumination-dependence of the zero-bias resistance-area product (R₀A) of HgCdTe photodiode. The model is based on three independent mechanisms. They are the depletion region volume change with the applied bias, the diffusion distance change with the moving depletion region edge, and the minority carrier accumulation in the depletion region which affects the minority carrier diffusion. Analytic equations are derived for the photodiode current-voltage characteristics and R₀A products. The results of the model have been compared with experimental data obtained from several Hg_0.7Cd_0.3Te diodes with an identical diode structure having different absorbing amount of light. The model showed good agreement with the experimental data.     

交互电视与应用

交互电视（ITV）是一种基础结构。这种结构提供了为数众多的硬件、软件和应用平台，这一点很像INTERNET。INTERNET也是一种结构，在它的上面有很多的硬件（服务器、客户机、调制解调器）、软件（WWW浏览器、WWW服务器程序、电子邮件服务器、通讯协议）和服务（FTP、电子邮件、新闻组、WWW）。     

掺杂Cu的Ni基催化剂用于制备碳纳米管

以共浸渍法制备的Ni-Cu-Al金属复合物为催化剂,甲烷高温裂解合成碳纳米管。考察了Cu含量对Ni-Cu-Al催化剂活性和碳纳米管形貌的影响及焙烧温度和焙烧气氛对Ni-Cu-Al催化剂性能的影响。采用透射电子显微镜对Ni-Cu-Al催化剂和碳纳米管的形貌进行了表征,采用程序升温还原方法考察了Ni-Cu-Al催化剂的还原温度。实验结果表明,在Ni-Al催化剂中加入Cu不仅可提高催化剂的活性、延长催化剂的寿命,还有助于控制生成的碳纳米管的内径。当n(Ni)∶n(Cu)∶n(Al)=75∶15∶10时,Ni-Cu-Al催化剂的BET比表面积最大,为278.18m2/g;活性也最高,在甲烷流量60mL/min、反应温度1023K、反应时间300min的条件下,碳纳米管的收率(以催化剂的质量计)为23.66g。Ni-Cu-Al催化剂的最佳焙烧条件为350℃,氮气气氛。     

浅层超稠油热采杜84-平28井设计与实钻技术

曙一区杜84块是辽河油田超稠油难采储量中规模较大的具有代表性的区块,开发中存在注汽困难、生产周期短、油井作业频繁热损失大、地层普遍出砂、综合成本高、开采难度大等一系列问题。根据油藏生产动态和综合分析油藏地质参数,结合油藏特征及原井网开发状况,通过对杜84-平28井优化设计和精心组织施工,重点对施工中产生的主要问题进行分析,采取科学合理的技术措施,取得显著的开发效果。     

2005年度EI收录中文石油期刊论文统计分析

对2005年度发表的中文石油科技期刊论文被EI收录的情况进行了检索、统计与分析。共有13种中文石油期刊发表的2514篇论文被EI Compendex Web收录，其中《天然气工业》、《钻采工艺》、《油气井测试》和《石油学报（石油加工）》4种期刊上发表的1064篇论文被EI核心收录。EI收录论文总数和核心收录论文篇数均创历年新高，表明我国石油科技论文的水平进一步提高。但是，与高达77种之多的庞大的中文石油科技期刊群和每年数以万计的中文石油科技论文产出量相比，EI所收录的中文石油科技期刊种数和论文篇数仍处于较低水平。