V棱镜法测掺Yb^3＋激光玻璃折射率

用Ｖ棱镜法测量了一类非常用应用前景的掺Ｙｂ＾３＋激光玻璃的折射率,得到了一些有用的数据,对有关掺Ｙｂ＾３＋激光玻璃的研究工作起了一定的辅助作用。     

Leakage of mantle helium from the Liaodong Peninsula, China

The isotopic cumpositions of helium have been investigated in hot spring gases sampled from the Liaodong Peninsula. China. The³He/⁴He ratios range from 0.14 Ra (0.14 times the atmospheric³He/⁴He ratio of 1.40 × 10^-6 to 0.72 Ra.³He/⁴He versus⁴He/²⁰Ne ratios and He contents suggest that a small amount of mantle-derived helium reaches the earth’s surface. Helium iwtope ratios of the hot spring gases show a distribution pattern similar to the regional heat flow values, indicating that the positive thermal anomaly occurring in the rtrea is closely associated with the presence of mantle-derived helium. The observations described above provide some significant evidence that the molten magma originating from partial melting of the upper mantle may have intruded into the continental crust along the activity fault. The coupling of the presence of mantle He and heat flow anomalies to seismic activity in studied region seem to imply that there is an internal relationship between mantle degassing and seismic activity.     

Two tyrosines in CD3ε-ITAM are required to induce T lymphocyte apoptosis

CD3ε of T cell antigen receptor complex (TCR/CD3) plays an important role in the resembling of the complex and activation signaling through its conservative immunoreceptor tyrosine-based activation motif (ITAM) in the cytoplasmic tail. Previous study showed that a chimera molecule, consisting of the extracellular-transmembrane domain of human CD8α fused to the cytoplasmic domain of CD3ε, induced apoptosis of T lymphocytes, indicating that apoptotic signals were transduced through the CD3ε- ITAM. To elineate involvement of the two tyrosines in apoptotic signaling pathway, cDNAs with mutations at Y170F, Y181F and Y170F/Y181F in CD8-ε-ITAM were made by point mutation and PCR, and then cloned into pcDNA3 eukaryotic expression vectors. Stable expression cell lines were established after transfection of the expression vectors into CD8+- Jurkat T lymphocytes. Stimulation of these cell lines with anti-CD8 monoclonal antibody showed that only the cells with expression of wild type chimera CD8-ε died by apoptosis, but not those cells with expressions of mutated CD8-ε chimera, indicating that the two tyrosines in CD3ε-ITAM were required for the apoptotic signal transduction in T lymphocytes.     

KCaF3结构相变的分子动力学模拟

基于无调节参数的Ｇｏｒｄｏｎ－Ｋｉｍ势和一种检测离子运动的新技术,以ＫＣａＦ３的分子动力学模拟结果为例,对钙钛矿ＡＢＸ３的离子分子固体的结构相变作了探讨．包括对阱势、折叠结构、能垒、超离子态、稳定性骨架和离子分子集团ＢＸ６的“尺寸”和“形状”．以期对离子分子固体的结构相变有一个基本了解．     

仔猪混合感染致病性白色葡萄球菌和大肠杆菌的诊断及防制初报

经过病原的分离鉴定、致病性试验及病仔猪防治效果的分析,确诊某集约化养猪场仔猪发生以“渗出性皮炎”为主的疾病为致病性白色葡萄球菌和大肠杆菌混合感染,通过采取综合的防制措施后,彻底控制本病的发生和流行。     

1,3—二氯—2—丙醇氧化反应的研究

对１,３－二氯－２－丙醇的氧化反应进行了系统的研究,将８４％的硫酸溶液慢慢滴加到包含有１,３－二氯－２丙醇和重铬酸钠水溶液的反应容器中去,将体系保持在２４℃～２６℃拦反应６ｈ,反应完成后,过滤回收１,３－二氯丙酮粗品,粗品用冰水洗涤,然后通过蒸馏经可获得８０．４％的收率的１,３－二氯丙酮,这是一种合成１,３－二氯丙酮较好的工艺,这种工艺与同类文献介绍的方法比较目标产物收率提高１０％,而反应时间缩短     

The Relation between the Sensitivity and HeatingVoltage of ZnSnO 3 Gas Sensor

对ＺｎＳｎＯ３气敏元件特性的测试结果表明,元件灵敏度随加热电压的变化而变化．当加热电压小于某一特定值ＶＨ０时,灵敏度不变;当加热电压大于３倍ＶＨ０时,灵敏度降低,元件失效。通过Ｘ射线衍射和ＳＥＭ二次电子能谱等检测实验,找出了气敏元件灵敏度降低的原因．     

Bi_2O_3气相热扩散及其工艺条件对SrTiO_3基多功能陶瓷性能的影响

研究了Ｂｉ２Ｏ３气相扩散及其热扩散工艺条件对半导化ＳｒＴｉＯ３基陶瓷的介电性能（ε）、介电损耗（Ｄ）、非线性系数（α）及电阻率（ρ）的影响,用ＳＥＭ和ＥＰＡ对微观结构进行了观察和分析,结果显示Ｂｉ２Ｏ３主要集中在晶界附近．用ＳｒＴｉＯ３气相扩散法成功地获得了εａｐｐ＞５００００,Ｄ＜０．０１,α＞６．０,ρ＞５×１０１０Ω·ｃｍ的ＳｒＴｉＯ３基多功能陶瓷．     

MgSiO3的分子动力学模拟

使用分子动力学模拟ＭｇＳｉＯ３以研究它的相变和超离子态．模拟采用Ｇｏｒｄｏｎ－Ｋｉｍ势和一种新的检测离子运动的技术．这项技术可以清楚地表现Ｏ２－离子的子晶格的熔解和八面体ＳｉＯ６的旋转．研究表明,ＭｇＳｉＯ３必须经历几番相变才能进入立方相．特别是在正交相和立方相之间存在一个过渡相．ＭｇＳｉＯ３确实存在超离子态相和立方相．这个超离子态相存在于熔点之前约２００～７００Ｋ．超离子态起始温度Ｔｃ和晶体熔点温度Ｔｍ的比率Ｔｃ／Ｔｍ～０．９２     

二维透视照片的三维全息图处理方法

提出一种二维透视照片合成三维全息图的方法．它利用人眼的视差及大脑本能功能,将普通相机对一物体在不同角度拍摄下的数张二维透明片,用激光全息的存贮编码方法进行组合记录,最后采用彩虹全息二步法进行第二次拍摄,可得到一张效果逼真且随观察角度的变化而变化的、具有动感的三维全息图．给出此方法的理论分析和实验结果．