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Grain boundary barrier structure of nano-titania modified TiO2 varistors ceramics were investigated by an experimental method.

1引言Ti仇压敏陶瓷是一种具有高电容性的低压压敏陶瓷电阻，是最有发展前途的压敏材料之一川。

Based on the introduction of manufacturing approaches of high energy ZnO varistors, this article also discusses methods to improve its energy performance and circulation performance, at last presents requests of standards for performance paramete...

介绍了高能ZnO压敏电阻的制造方法，在此基础上论述了改善高能znO压敏电阻能量耐量和通流性能的方法，最后提出了要规范高能ZnO压敏电阻性能参数和检测标准。

In this paper, the history, the characteristics and the recent technological status of the ZnO varistor wasreviewed and the evolution of it was forecast at the same time.

本文简要回顾了ZnO 压敏陶瓷的历史，阐述了ZnO 压敏陶瓷的特点以及当前ZnO 压敏陶瓷基础性研究的现状，最后对其进展进行了展望。

Atdifferent point before and after Subcutaneous administration of the trugs, theparameters of HR, LV-PSP, LV-DP±dp/dt~max、(the maximum ofshortening velocity of myocardium under unloading ) and RPP were recorded.

观测经皮下给药前后不同时刻的心率和左室收缩压峰值、左室发展压、左室压力随时间变化的最大速率、零负荷时心肌最大收缩速率、心率与左室发展压乘积等。

Should product valve set with valve rod dense cover average adopt hard alloy built-up welding, Gets up resistance to abrasion, Endure rot, Endures warm effect; Main body adopts plasticity material by transfer quality ensure valve whole bear pressure big; Fixes press exhaust groupware by special treatment, With the help ofs flowmeter, To bushing gas, Oil gas exceed presses behind proceed canny fit arrange press.

该产品阀座与阀杆密封面均采用硬质合金堆焊，起到耐磨、耐腐、耐温的作用；主体采用塑性材料经调质保证了阀门整体承受的压力大；定压排气元件经特殊处理，借助流量计，对套管气、油气超压后进行精准排压。

On the contrary, a kind of coarser structures and some metallurgical drawbacks, such as micro-holes and shrinkages, will appear in the mould-cast alloy thus mechanical properties of the latter is poorer than that of the former.2 When in different part or the casting thickness not equal, the die-casting magnesium alloy AZ91D has different mechanical property.

压铸镁合金AZ91D的组织由均匀细小的近球状组织和细小的放射状枝晶组成，相比较而言，砂型铸件组织粗大，易产生气孔、收缩等缺陷，故而其力学性能比压铸件要差。 2。压铸镁合金AZ91D铸件依部位和厚度不同，力学性能也不同。

A new die-casting die fit on cold chamber die casting machine was redesigned in the part of the center gate and floating flow-distribution.

分析了录音机芯飞轮压铸模的原设计失败的原因，重新设计了用于冷室压铸机的中心浇口、浮动分流的压铸模。

U.S. REGO, Fisher, AMCO gas regulator to enter the Chinese market has a few 10 years, the production of sophisticated products, the regulator stability, a wide range, reliability, high accuracy, applicable to China's gas industry, one, two, one-paragraph regulator, the main models of the United States REGO LV1584MN, LV1588MN, LV4403, LV5503 series, the United States FISHER 627,1098,299, S402 series, the United States AMCO 1200 B, 1213B2, 1800,2000,3000, AFV Series, Italy TARTARINI the A149, B249, FL-BP, MBN, the United Kingdom Jeavons J42 series, South Korea ILSIN the IS-35, IS-120, ILR-2020A, ILR-2035 series, welcomed the purchase.

美国REGO、Fisher、AMCO燃气调压器进入中国市场已几十年了，该产品制作精良、调压稳定、范围广、可靠性精度高，适用于我国燃气行业，有一级、二级、单段调压器，主要型号美国REGO的LV1584MN、LV1588MN、LV4403、LV5503系列、美国FISHER的627、1098、299、S402系列、美国AMCO的1200B、1213B2、1800、2000、3000、AFV系列、意大利TARTARINI的A149、B249、FL-BP、MBN、英国Jeavons的J42系列、韩国ILSIN的IS-35、IS-120、ILR-2020A、ILR-2035系列，欢迎选购。

4 From the center line of the pipe up to 600 mm above the top of the pipe, the backfill shall be deposited in maximum 150 mm layers, each layer being compacted with suitable rampers to 95 percent of maximum density in accordance with ASTM-D1557 for cohesive soils, to 70 percent relative density in accordance with ASTM-D2049 for cohesionless soils.

从管道的中线到管道上部600毫米的高度，回填土应每层为150毫米的厚度，每层回填土应以适当的捣锤压实，根据ASTM-D1557规范，粘土应压实的最大密实度为95%，根据ASTM-D2049规范，非粘土应压实到相对密实度为70%。

It introduces the target and aim of prestressing test,elaborates prestressing crafts of large bridge building machine,brings forward how to simulate prestressing pile on large bridge building machine in big bulk,so as to ensure the safety of construction and feasibility of the plan under inspection state.

介绍了预压试验的对象及其目的，简要叙述了造桥机在施工中的预压工艺，提出了如何在造桥机上进行大吨位预应力箱梁模拟预压的方法，从而保证检验施工状态下造桥机的施工安全及方案的可行性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。