CVI制备碳/碳复合材料致密化行为模拟研究

化学气相渗透技术（ＣＶＩ）是制备高性能碳／碳复合材料的一种重要方法,本文通过建立有限差分模型,对圆柱形单向碳／碳复合材料的ＣＶＩ致密化行为进行了模拟,并详细描述、分析了模型原理与模拟步骤,设计了专门的对照实验,检验模型计算结果的准确性。对比结果表明,模拟值与实验结果具有很好的一致性,预测的渗透终止时间、终止密度与实验结果十分接近,误差在１０％以下。     

泰国0.7Mt/a催化裂解装置的设计和投产

泰国石化工业公司采用中国石化石油化工科学研究院开发的催化裂解技术,建成１套０．７ Ｍｔ／ａ催化裂解装置,主要用于生产丙烯。该装置于１９９７年５月建成投产,原料为经低苛刻度加氢处理的沙特阿拉伯轻质原油的直馏粗柴油,采用该院专门开发的ＣＲＰ－Ｓ催化剂,在补充速率较低的情况下,催化剂有较好的丙烯和汽油选择性。丙烯产率超过１７％,汽油产率为３１．９％,研究法辛烷值为９９．３,马达法辛烷值为８５．３。同时该院的中试结果还准确地预测了装置性能并提供了设计基础数据。     

可消除热零点漂移的双压阻半桥压力传感器

提出一种可消除热零点漂移的压阻式压力传感器。该传感器由两个压阻半桥构成。两个“半桥”受力时输出信号的极性相反,而零压时输出信号极性相同。两桥输出信号相减后,其压敏输出与一个压阻全桥的输出值相同,而随温度变化的零压输出则相互抵消。模拟实验显示出预期效果     

变截面柱吊点位置选择

通过预先计算特征值的方法,简化变截面柱一个吊点安装和两个吊点平移对构件产生外力的计算。     

探边机控制系统设计

文中介绍了利用单片机实现的探边机控制系统的主要构成环节和功能，并进一步说明了控制系统的软件设计方法。     

高炉锰铁液固态的锰磷成分差异

用数理统计方法对大量生产记录数据进行了分析核对,确认高炉锰铁在液、固两种状态时,锰、磷成分存在着差异这一事实。并确定了固态锰铁含锰量降低、含磷量增加的成分劣化区间为:锰的平均降低值在-0.275％和 0.022％之间,磷的平均升高值在-0.0015％和 0.0171％之间。按GB7730.1-7730.4-87规定与允许化验误差比较分析,也有一定超差比例存在。     

Group psychotherapeutic factors in a self-assertive group

The technique of group psychotherapy has recently been introduced to the practice in self-assertiveness training group. This study aims to assess various group factors that are hypothesized to be effective in the group process in a self-assertive group. Subjects of the study were participants in a 13-member self-assertiveness training group, with 4 female nurses and 8 male employees and 1 male student. The average age of this group was 35.2 years. Assessment of the group was based on Yalom's concept of twelve therapeutic factors in the group process. The results showed that 'identification', 'The existential factor' and 'interpersonal learning-input' were the three most important factors demonstrated during the group process. There were no significant age and gender differences in the above 'identification' and 'existential' factors. However, different beneficial factors were found for each group: for subjects aged 40 and above and males, it was 'interpersonal learning-output'; while in those with aged under 40 and females, 'universality' was more important than 'interpersonal learning-input'. Comparison of therapeutic factors among different groups was attempted. The above results were found different from patient groups, or the groups of university students. The discrepancy is due to different composition and tasks of each group.     

HC112市内电话维护管理系统

本文介绍了市内电话维护管理系统体系结构的层次模型，讨论了各组成部分的关键技术及层间关系，给出了一种基于局域网和广域网的ＨＣ１１２（Ｈｙｐｏ Ｃｅｎｔｒａｌｉｚｅｄ１１２）的实现。     

Examination of the kinetics of herpes simplex virus glycoprotein D binding to the herpesvirus entry mediator, using surface plasmon resonance

Previously, we showed that truncated soluble forms of herpes simplex virus (HSV) glycoprotein D (gDt) bound directly to a truncated soluble form of the herpesvirus entry mediator (HveAt, formerly HVEMt), a cellular receptor for HSV. The purpose of the present study was to determine the affinity of gDt for HveAt by surface plasmon resonance and to compare and contrast the kinetics of an expanded panel of gDt variants in binding to HveAt in an effort to better understand the mechanism of receptor binding and virus entry. Both HveAt and gDt are dimers in solution and interact with a 2:1 stoichiometry. With HveAt, gD1(306t) (from the KOS strain of HSV-1) had a dissociation constant (KD) of 3.2 x 10(-6) M and gD2(306t) had a KD of 1.5 x 10(-6) M. The interaction between gDt and HveAt fits a 1:1 Langmuir binding model, i.e., two dimers of HveAt may act as one binding unit to interact with one dimer of gDt as the second binding unit. A gD variant lacking all signals for N-linked oligosaccharides had an affinity for HveAt similar to that of gD1(306t). A variant lacking the bond from cysteine 1 to cysteine 5 had an affinity for HveAt that did not differ from that of the wild type. However, variants with double cysteine mutations that eliminated either of the other two disulfide bonds showed decreased affinity for HveAt. This result suggests that two of the three disulfide bonds of gD are important for receptor binding. Four nonfunctional gDt variants, each representing one functional domain of gD, were also studied. Mutations in functional regions I and II drastically decreased the affinity of gDt for HveAt. Surprisingly, a variant with an insertion in functional region III had a wild-type level of affinity for HveAt, suggesting that this domain may function in virus entry at a step other than receptor binding. A variant with a deletion in functional region IV [gD1(Delta290-299t)] exhibited a 100-fold enhancement in affinity for HveAt (KD = 3.3 x 10(-8) M) due mainly to a 40-fold increase in its kinetic on rate. This agrees with the results of other studies showing the enhanced ability of gD1(Delta290-299t) to block infection. Interestingly, all the variants with decreased affinities for HveAt exhibited decreased kinetic on rates but only minor changes in their kinetic off rates. The results suggest that once the complex between gDt and HveAt forms, its stability is unaffected by a variety of changes in gD.     

Klebsiella pneumoniae panophthalmitis: a possible complication of endoscopic variceal injection sclerotherapy

Complication of endoscopic variceal injection sclerotherapy for esophageal variceal hemorrhage is not unusual. However, sclerotherapy complicated panophthalmitis was never reported before. We report such an unusual complication and discuss its possible mechanism and treatment.