真空

Babbage proposed the idea more than a hundred years later, the electromagnetic science, electrical engineering, electronics continue to make significant progress in the components, the device aspects of the invention of a series of vacuum diode and triode vacuum; in the system technology, have been the invention of wireless telegraphy , television and radar .......

巴贝奇的设想提出以后的一百多年期间，电磁学、电工学、电子学不断取得重大进展，在元件、器件方面接连发明了真空二极管和真空三极管；在系统技术方面，相继发明了无线电报、电视和雷达……。

VS-600 external –pump vacuum machine Uses Japan and Korea leading technology collection vacuum,Seal and Gasifies the many kinds of functions, The seal uses the barometrical pressure type, Thorough change tradition packing seal not firm phenomenon.

vs-600 外抽式真空包装机采用日韩领先技术集真空，封口，充气多种功能于一体，封口采用气压式，彻底改变传统包装封口不牢的现象。

Stannous caprylate was selected as the catalyst. Under certain vacuum, we investigate the relation of both the dose of catalyst, the temperature of reaction, the time of reaction and the molecular weight of the PLA.Furthermore we investigate how the purity of lactide and the circumstance of vacuum affect the molecular weight of the PLA.

实验中选用辛酸亚锡Sn(oct_2为催化剂，在一定的真空度下考察了催化剂用量、反应温度、反应时间与聚乳酸分子量的关系；并考察了丙交酯纯度及真空度对聚乳酸分子量的影响。

Non-frying crisp chip of chaenomeles were processed by vacuum infusing and vacuum dehydrating at lower temperature , the products keep its original color, taste and high Vc content, the products is bright-color, plump slice and harmonious sweet and acid, rich in chaenomeles flavor.

应用真空糖渍和真空低温干燥技术对新鲜木瓜进行加工，研制具有天然水果色、香、味的无油木瓜脆片。

Steelmaking Plant can be reduced to 20ppm by increasing argon flow of RH degasser and controlling vacuity According to the above results, the main efforts to develop IF steels have been made at No 3 Steelmaking Plant.

研究结果表明：钢水增碳主要在大包中发生，影响钢水增碳的主要因素是钢液与包壁接触面积与钢水体积之比，在高温下，耐火材料中CO的压力和钢水中Als的含量对钢水增碳也有一定的影响；钢水脱氧后将增硅，钢水的增硅量主要受大包渣的碱度、中包绝热板材料和中包保护渣碱度的影响；通过增大RH真空处理装置的氩气流量和控制真空度，能将三炼钢厂大包钢水的碳含量降到20ppm左右。

The mechanical pump is a direct drive rotary vane vacuum pump. It is used as a forepump for the diffusion pump, and to rough pump the degasser, the distillation, the distillate and the residue chambers.

机械真空泵直接驱动，为扩散泵预先抽取真空，也为了脱气，蒸馏，残留物收集器和蒸馏物收集器的抽取真空工作。

The equipment and the pipeline of the fractionating system are designed scientifically and reasonably to exert the performance of the vacuum pump to the utmost.

分馏设备设计及管路设计合理，能最大限度发挥真空性能，达到高真空状态。

GUD electric high vacuumball valve uses electric device to drive the stem and ball for open and close, thus to put through or cut off the medium flow in vacuumpipeline.

GUD型电动高真空球阀是以电动装置驱动阀杆与球芯来执行启闭动作，达到接通或切断真空系统管路中的介质流。

Intravertebral clefts were observed in none of 11 cases on sitting and flexion positions, in 4 of 11 (36%) on extension, and 11of 11 (100%) on supine and prone positions.

在直立侧位及过屈侧位X射线平片上，11例患者均未出现椎体真空征，过伸侧位上出现4例（36%），俯卧位及仰卧位均出现椎体真空征（100%）。

The precipitation behavior of the V-4Cr-4Ti alloy and the hardening by aging were studied by isochronally annealing and aging heat treatments in vacuum.

采用真空退火和真空时效处理，研究了V-4Cr-4Ti合金的沉淀析出特性和时效强化效果。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐