412例性病患者的HIV感染状况及临床特征

目的了解性病患者的艾滋病病毒(HIV)感染状况并分析其临床特征。方法自愿接受HIV咨询检测的基础上,对临床确诊的412例性病患者进行HIV-1/2抗体检测,并对其临床特征进行分析研究。结果412例性病患者的HIV检出率为2.9%。性病患者中检出HIV阳性率依次为:尖锐湿疣6.2%,生殖器疱疹4.2%,梅毒3.4%,淋病1.5%,非淋菌性尿道炎1.0%。合并感染HIV的性病患者中,83.3%的患者有多性伴,商业性行为普遍存在,安全套使用率极低。感染HIV的尖锐湿疣患者及生殖器疱疹患者以频繁复发为突出表现,1例合并感染HIV的梅毒患者半年即进展为神经梅毒。结论性病患者是HIV感染的重要高危人群,危险性行为是其感染HIV和其它性病的主要原因,应该加强性病患者的HIV监测。对临床上频繁复发的尖锐湿疣及生殖器疱疹患者,快速进展的梅毒患者,应高度怀疑合并HIV感染的可能。

铜-铝扩散焊及拉伸的分子动力学模拟

采用分子动力学方法模拟了铜-铝扩散焊过程,分析了理想平面铜-铝试件(001)晶面间扩散焊的过渡层厚度,并利用径向分布、键对分析方法分析了在不同的降温速率下过渡层的结构变化.降温速率大时,过渡层保持原有无序结构,降温速率小时,过渡层从无序结构向面心立方结构转变.还对扩散焊后的铜-铝试件进行了拉伸模拟,并与尺寸大小相近的单晶铜和单晶铝的拉伸模拟结果进行比较.结果发现焊接后的强度比单晶铝和单晶铜的强度都要小,最大应变值也小.

Designing Of Partial Similarity Models And Evaluation Method In Polymer Flooding Experiment

Based on the scaling criteria of polymer flooding reservoir obtained in our previous work in which the gravity and capillary forces, compressibility, non-Newtonian behavior, absorption, dispersion, and diffusion are considered, eight partial similarity models are designed. A new numerical approach of sensitivity analysis is suggested to quantify the dominance degree of relaxed dimensionless parameters for partial similarity model. The sensitivity factor quantifying the dominance degree of relaxed dimensionless parameter is defined. By solving the dimensionless governing equations including all dimensionless parameters, the sensitivity factor of each relaxed dimensionless parameter is calculated for each partial similarity model; thus, the dominance degree of the relaxed one is quantitatively determined. Based on the sensitivity analysis, the effect coefficient of partial similarity model is defined as the summation of product of sensitivity factor of relaxed dimensionless parameter and its relative relaxation quantity. The effect coefficient is used as a criterion to evaluate each partial similarity model. Then the partial similarity model with the smallest effect coefficient can be singled out to approximate to the prototype. Results show that the precision of partial similarity model is not only determined by the number of satisfied dimensionless parameters but also the relative relaxation quantity of the relaxed ones.

第7届国际等离子体化学会议(ISPC-7)

<正> Ⅰ.概况 国际等离子体化学会议(ISPC)每两年举行一次,主要交流等离子体化学如下几方面的研究和发展情况:合成,诊断,等离子体刻蚀,等离子体沉积和聚合,模型,表面作用以及熔化、气化、等离子体喷涂等。ISPC-7由荷兰Ejndhoven技术大学负责组织,Philips公司支持,在Philips会议中心举行。会议期1985年7月1—5日。第一天样品展览,

临界点附近流体热力学函数特性的研究

作者用限定立方模型参数标度状态方程水出热力学函数,P、P/T、K_T、C_v和(C_p—C_v)的奇异项的表达式;用回归分析求出他们的基值项的表达式,并对两种物质SH_6、CO_2的热力学函数用上述表达式进行了计算,计算结果与实验值的一致性是很好的,具总体标准偏差小于7.4％。

对流放电CO_2激光器的饱和特性

本文从微观的分子模型出发,得到了饱和强度的定量解析表达式。考虑了激励区气压、温度、流速的变化,计算了不同参量下激励区各点的饱和强度和小信号增益。分析讨论了气压、流速、气比、放电比功率对饱和强度及小信号增益的影响。并将饱和强度的计算结果与实验进行了比较,结果符合较好。

碳纳米管的力学行为

着重对纳米材料中很重要的和亟待研究与应用的材料之一--碳纳米管的力学行为以及与之相关的实验和性质进行了综述。从碳纳米管的结构、实验、应用等几个方面，通过对以往的各类实验进行总结，着重评述了碳纳米管的一些奇异的力学行为。总结了一些实验结果以及相关的碳纳米管的力学性能；根据对碳纳米管结构的分析，阐述了奇异性能产生的原因；通过分子动力学模拟，对碳纳米管的一些力学和电学性质进行分析；简要的总结了碳纳米管的一些力学方面的应用以及前景。

微重力下环境压力和辐射再吸收对火焰沿薄燃料表面传播的影响

当环境气体不具备辐射特性时(例如环境气体为O2-N2),在较小的环境压力下,火焰向燃料表面的热传导是火焰传播的主要驱动力.但随着环境压力的增大,火焰传播速度越来越大,火焰对燃料表面的热辐射逐渐成为火焰传播的主要驱动力之一.当环境气体具有较强的辐射特性时(例如环境气体为O2-CO2),在较小的环境压力下,火焰前沿环境气体的辐射再吸收将强化火焰对燃料表面的传热、热辐射和热传导在火焰传播机理中均起重要作用.随着环境压力的增大,氧气向火焰的扩散加强,燃烧反应加剧,火焰传播加速.当环境压力大于一定值时,进一步增大环境压力,环境气体的辐射再吸收使火焰对燃料表面的热辐射减弱.因此,火焰传播速度反而随着环境压力的增大而减小,火焰向燃料表面的热传导逐渐成为火焰传播的主要驱动力.

载流球台薄壳的磁弹性应力与变形分析

在对机械载荷与非定常电磁场耦合作用下的球台薄壳的应用力、位移与电磁场、机械场等关系研究的基础上，建立了载流球台壳的磁弹性基本方程，采用方离变量法，导出了数值计算方程式，并通过具体算例，讨论了电场中电磁量、作用时间等因素与球台壳应力及变形之间的关系。

Broadband high-gain optical parametric chirped-pulse amplification near 780 nm with LBO-I near-degenerate near-collinear phase match

Near-degenerative near-collinear phase-match geometry for broadband optical parametric chirped-pulse amplification (OPCPA) at approximate to 780 nm is calculated in comparison with nondegenerate noncollinear phase-match geometry. In an experiment on LBO-I near-degenerate near-collinear OPCPA, high gain with broad gain bandwidth (approximate to 71 nm, FWHM) at approximate to 780 nm is achieved by using an approximate to 390-nm pumping pulse. The stretched broadband chirped signal pulse near 780 nm is amplified to approximate to 412 mu J with a pumping energy of approximate to 15 mJ, and the total gain is > 3.7 X 10(6), which agrees well with the calculation. For a broadband (covering approximate to 100 nm) chirped signal pulse, the theoretical gain bandwidth has been attained experimentally for the first time. (c) 2005 Society of Photo-Optical Instrumentation Engineers.

Broadband high-gain optical parametric chirped-pulse amplification near 780 nm with LBO-I near-degenerate near-collinear phase match

Near-degenerative near-collinear phase-match geometry for broadband optical parametric chirped-pulse amplification (OPCPA) at approximate to 780 nm is calculated in comparison with nondegenerate noncollinear phase-match geometry. In an experiment on LBO-I near-degenerate near-collinear OPCPA, high gain with broad gain bandwidth (approximate to 71 nm, FWHM) at approximate to 780 nm is achieved by using an approximate to 390-nm pumping pulse. The stretched broadband chirped signal pulse near 780 nm is amplified to approximate to 412 mu J with a pumping energy of approximate to 15 mJ, and the total gain is > 3.7 X 10(6), which agrees well with the calculation. For a broadband (covering approximate to 100 nm) chirped signal pulse, the theoretical gain bandwidth has been attained experimentally for the first time. (c) 2005 Society of Photo-Optical Instrumentation Engineers.

双色激光场中激光强度和脉宽对线性多原子分子离子电离的影响

利用强激光场电离和离解分子来研究分子激发态的波包结构是强场物理的重要研究方向。利用短时指数传播子对称分割法和快速傅里叶变换技术。数值求解了一维含时Schr（oe）dinger方程，探讨了双色激光场中激光的基波和谐波强度之间的不同配比以及脉宽对线性多原子分子离子电离的影响。理论计算结果表明：基波和谐波的相对相位为π时，尽管随着激光的基波和谐波强度之间配比的变化，电离几率随原子间距变化的趋势基本保持不变，但在一定的激光基波强度下(1．2×10^13～1．2×10^15W／cm^2)，激光基波强度的变化可以明显

两根掺镱大芯双包层光纤激光器获得113W同相输出功率

利用一个自成像共焦腔和一个空间滤波器实现了两掺Yb大芯光纤激光器的位相锁定。观测到稳定的具有高对比度的干涉条纹。相干条纹的对比度为59%，而非相干时对比度为6%。中心条纹的宽度与理论计算结果吻合得很好。对同相模式而言，位相锁定激光器阵列输出达到113W，对应的斜率效率为38.5%。