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The invention is characterized in that it dops ytterbium and zinc in lead tungstate crystal, which greatly improves its optical properties on the basis of retaining original good properties of lead tungstate crystal.

本发明在钨酸铅晶体中掺杂元素镱和锌，在保留钨酸铅晶体原有优良性能的基础上，大幅度改善其光学性能。

Effects of yttrium on microstructure, mechanical properties at room temperature and elevated temperature, cast properties and corrosion resistance of Mg-Al system alloys are reviewed in the paper.

综述了钇对Mg-A1系合金的组织、室温和高温力学性能、铸造性能以及耐腐蚀性能的影响。

The effects of DCPD and adipic acid content on product properties are investigated and the properties of DCPD-type-UPR and 191# UPR are cont rasted.

考察了双环戊二烯、己二酸加入量对双环戊二烯型不饱和聚酯树脂性能的影响，并与通用191#树脂的性能进行了比较。

C. PALS measurements were performed for dynamically cured EPDM/PP blend as afunction of composition. The variation of free volume properties is compared with themechanical properties, and we preliminarily discuss the internal correlation betweenthem. 2. Natural polymer and its 〓 modified system PALS measurements were performed on pure chitosan and 〓-containingchitosan as a function of temperature from 290K to 380K.

c。研究了不同组分比的动态硫化乙丙橡胶／聚丙烯共混物的自由体积特性，观察到两相之间的部分相溶程度随着组分的变化而改变， D MTA、DSC的结果也证实了上述结论，与力学性能等实验结果进行比较得到了共混物的相溶性与宏观力学性能的内在联系。2。

In this dissertation, the weak gels with good thermal stability and/or salt tolerance for use in EOR were prepared from HPAM and aluminium citrate or the compound containing hydroxymethyl groups in aqueous solution. The gelation mechanisms, structure, and properties of the HPAM-AlCA and HPAM-PRIM gels were investigated. For the HPAM-AlCA gelling system, the effects of aluminium : citrate and pH value on the properties of AlCA were systematically studied.

本文以研制高性能价格比的提高石油采收率用聚合物材料为目标，在耐温抗盐水溶性聚合物研究工作的基础上，选择聚合物弱凝胶这一前沿课题为研究对象，对HPAM-柠檬酸铝凝胶的有关基础问题进行了研究，研制出了具有优异耐温抗盐性能的HPAM-PRIM弱凝胶，解决了采用聚合物提高石油采收率的高性能与低成本之间的矛盾。

It was found that the mechanical properties of the joints decreased by the alclad and it will be increased dramatically by removing the alclad. The effect of alclad on the bottom surface is larger than on the top surface. The mechanical properties of 2024-T3 joints will fall down because alclad is entrapped into the welded joints by the rotating and stirring tools during the friction stir welding, similar with "inclusion" in fusion welding.

研究结果表明，包铝层的存在明显降低了2024-T3铝合金搅拌摩擦焊接头的力学性能；去掉包铝层后接头的性能显著提高；下表面包铝层对接头性能的影响大于上表面包铝层；当2024-T3铝合金表面带有包铝层进行搅拌摩擦焊接时，在搅拌头的旋转和搅拌作用下，包铝层被卷入焊缝中，形成类似于熔焊的&夹杂&，从而使得接头的力学性能下降。

The relation between needle-punching density and nonwoven geotextiles properties is also discussed. The experimental results prove that the new filtration material possesses better permeability and anticlogging properties and mechanical strength and the development of this new filtration material is more significant.

另外，还选取了两种同规格的常规针刺土工织物作为对比试样，分别测试了其过滤性能及渗透性能，经对比验证了研制的滤层材料试样具有更好的渗透性和防淤堵性，以及足够的机械强度，是一种性能优异的防淤堵滤层材料。

A novel anticoagulative biomaterial which was prepared from modified graphite oxide and silicone rubber through solution intercalated reaction was synthesized, The excellent properties of the new type nanocomposites, such as good mechanical strength and blood compatibility, have been characterized by XRD, mechanical properties, adhesion of blood platelet test and the heparin release rate test.

摘要利用溶液插层法合成了新型的硅橡胶／氧化石墨－十八烷基二甲基－2-羟乙基溴化铵－肝素纳米抗凝血复合膜材料，并通过机械性能测试、X射线衍射、血小板黏附试验和肝素扩散速率测定实验对复合膜材料的力学性能和血液相容性进行了表征。

We have presented some important evidences to the antiknocking mechanisms of aromatic amine through investigating the reactions of aromatic amine and peroxide on the premise of analyzing the electrochemical properties of aromatic amine. As a result, the relationship of antidetonating quality and electrochemical properties has been discussed.

本文在分析苯胺类化合物电化学性质的基础上，通过研究苯胺类化合物与过氧化氢的作用，为芳香胺抗爆机理的研究提供了重要依据，并由此探讨抗爆剂的抗爆性与电化学性质的关系。

To investigate the role of transmural dispersion of repolarization and cardiac restitution properties in arrhythimogeneity in LQT2, we observed the effects of d, 1-sotalol, hypokalemia and calcium channel blocker on TDR and cardiac restitution properties at different basic cycle length by using the arterially perfused rabbit left ventricular wedge preparation.

为探讨心室跨壁复极离散度和动作电位时程恢复性质的变化在LQT2室性心律失常发生中的作用，笔者采用冠状动脉灌注的兔左室肌楔形组织块制备LQT2模型。标本随机分四组：对照组；LQT2模型组（100 mol/L d，1-sotalol灌流）；模型+低钾(3 mmol/L)组和模型+低钾+维拉帕米(2 mol/L)组。

It has to be computed by the host for the actual clock rate.

主控制器可以用来计算实际的时钟速率。

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