查询词典 vacuum can

But in practical operating, overvoltage caused by reignition of the vacuum switching device frequently appears, and it result in damage of the capacitor bank or the switchgear itself. Ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon. In this paper, a study on overvoltage caused by reignition due to capacitor bank switching with the vacuum switching device and its preventive measures are carried out. The main work which has been done and researches are as follows: 1. The producing mechanism of overvoltage and its influence factor are analyzed. It is pointed out that single-phase reignition is the main reason for damage of the switchgear and two-phase reignition is the main reason for damage of the capacitor bank,so overvoltage of single-phase reignition and two-phase reignition are the emphases of prevention. 2. Analysis of the special working condition of the operating switch for capacitor bank is carried out. It indicates that the vacuum switching device is difficult to realize no-reignition under this operation condition, so it is more practical to adopt protection devices. 3. Analyses of protection effect of RC and MOA and their shortages are carried out. It shows that the two methods can only restrain effectively overvoltage caused by single-phase reignition, and they cannot protect the capacitor bank when reignition of two-phase occurs. 4. The operation principle of G-R damping device is analyzed and discussed emphatically.

本文针对真空开关投切电容器组时因重燃而产生的过电压及其防治措施进行了研究，所开展的主要工作和研究结果如下： 1、对过电压的产生机理及其影响因素进行了分析，指出单相重燃是导致开关设备损坏的主要原因，而两相重燃则是导致电容器组损坏的主要原因，因此单相重燃和两相重燃过电压是防护的重点； 2、对电容器组操作开关的特殊运行条件进行了分析，指出在这种运行条件真空开关难于实现不重燃，因此采用保护装置更具有现实意义； 3、对RC与MOA的保护效果和存在的不足进行了分析，指出这两种方法均只能有效抑制单相重燃过电压，而不能在发生两相重燃时保护电容器组； 4、重点对G-R阻尼装置的工作原理进行了分析和讨论，指出该装置接入后线路中将会出现两种频率的高频振荡，而电容器组上的过电压是由这两种振荡共同决定的； 5、根据对上述两种振荡的分析指出存在一个最佳电阻值使得过电压最低，并提出了电容器组电压和最佳电阻值的近似求解方法； 6、使用电气暂态分析软件MATLAB对G-R装置的保护效果进行了仿真计算，证实该装置确实可以有效抑制重燃时的电容器组过电压； 7、根据仿真与近似计算结果的偏差提出了近似计算的修正方法，经过修正后的过电压计算结果与仿真结果吻合较好； 8、对G-R装置中放电装置G与阻尼电阻R的要求进行了分析，指出采用编织电阻和真空间隙可能是最佳选择。

DZQ-600L multi-functional gas-filling packaging machine which has many functions. It can be used for sealing packages only, but also for vacuum packaging or packaging of filling with insert gas after vacuum. It adopts mo case anted double gas, and mechanism has no restriction of big or small vacuum case which has a wide scope of application.

DZQ-600L 多功能真空气调包装机，功能齐全，可用于单一的封口包装，也可用于真空包装或真空后充入惰性气体的包装，采用无室双气嘴机构，不受真空室大小的限制，应用范围极广。

This article introduces vacuum stack preloading's developing process, reinforcement mechanism and use on soft ground treatment. Through comparative analysis among the vacuum stack preloading and other methods and instances, it shows that the vacuum preloading concerting stack preloading technology is increasingly maturing, the method is simply, and it can not only strengthen ground, but also shorten total period efficiently. It may be expanded further as a mean for highway soft ground treatment.

本文通过介绍真空堆载预压法的发展过程、加固机理以及在软基处理中的应用情况，并和其它方法进行了对比分析，通过实例说明了真空堆载联合预压法的施工工艺在公路建设中已逐渐成熟，施工方法较为简单，不仅能增加地基稳定性，同时有效地缩短施工总工期，可作为公路软基处理的一种手段进一步推广。

This system which can do correlation analysis among vacuum arc imagine, light intensity spectrum density, electron density, vacuum arc voltage, vacuum arc current has a series of properties like synchronous exposure, high sampling speed, good quality with comparatively low price, strong functional software, friendly user's interface and so on.

本课题研制成功了真空电弧动态图象高速微机采集系统，该系统具有同步曝光、采样速度快，性能价格比高，软件功能强，用户界面好等特点，该系统可对瞬时的真空电弧形态，光强密度，电子密度，电弧电压，电弧电流进行相关分析。

In chapter three,we have derived a generalized dual London equation for the Abelian "electric" field A_μfrom the effective dual Abelian-Higgs model.The approximative result and the numerical simulation result as well as their figs were shown via solving the dual Abelian-Higgs model with different methods.Hereby the vortex solution of the chromo-electric field and the vortex energy density were also discussed.Finally,we have studied the dual Abelian-Higgs model with additional vacuum constant,and have unpuzzled the vacuum constant corresponding to the bag model.When the quark sources is introduced, the vacuum constant in the MIT bag model is proportional to the quartic of the monopole mass.

利用不同方法求解该方程，给出了该方程的近似结果和数值模拟结果，并分别对两种情形画出图像作了比较，据此还讨论了色电场的涡旋解及能量密度，最后讨论了含有附加真空常数的对偶阿贝尔-黑格斯模型并对应口袋模型给出了附加真空常数的物理解释，引入夸克源之后还预言麻省口袋模型中的真空常数正比于单极质量的四次方。

In studying the linear response of the dressed quark propagator in the presence of the variable external field, we derive a general expression for the vacuum susceptibility, based on the two-point external field formula in the Quantum Chromodynamical sum rule. The expressions we have derived for the calculation of vacuum susceptibility are model independent. Then we use the expressions to calculate the renormalised axial vector, vector and tensor vacuum susceptibilities.

接下来在研究夸克传播子在外场中的线性响应时，我们利用QCD求和规则两点外场公式推导出了一般的计算真空磁化率的公式（以变化的轴矢量外场为例），我们这里推导出的真空磁化率的计算公式是模型无关的。

Pressure Gauge:Corrugate Pipe Type Precision Pressure Gauge and Vacuum Gauge、Corrugate Pipe Type Pressure Gauge,Combined Pressure And Vacuum Gauge And Vacuum Gauge, Capsule Pressure Gauge, Recording Pressure Gauge, Tyre Pressure Gauge, Pressure Controller, Digital Pressure Gauge

压力仪表：弹簧管式精密压力表和真空表、弹簧管式一般压力表、压力真空表和真空表、膜盒压力表、记录式压力表、压力真空表及真空表、轮胎压力表、压力控制器、数字压力计

SZG series double cone rotating vacuum drier's main machine is double cone tank, let steam or heat water inside sealed jacket heat the inner shell in vacuum state, the hot transferred from inner shell to dump material, make water of the dump material gasify, low speed motor drying the tank along, make material up and down, from inside to outside, and change the heated surface, at the same time, vapour is taken out continually through vent-pipe of vacuum pump, increase the speed of drying, attain the purpose of uniformity drying at last, it is in conformity with the requirement of GMP.

SZG双锥回转真空干燥机主机为双锥形罐体，罐内在真空状态下，夹套内可通过内胆传递给湿物料，使湿物料中水分气化，低速电机带动罐体回转，物料不断上下内外翻动，更换受热面，同时，水蒸气通过真空泵经真空排气管不断被抽走，加快了物料干燥速率，最终达到均匀干燥的目的。符合药品管理规范"GMP"的要求。

1 Equipment of powder materials treatment: Reduction furnace for metal powder( including push rod type, steel strip type and net strip type), device of ammonia decomposing (dew point or flux feedback control type), rotary motion double cone vacuum dryer, whole set of equipment of high pressure water atomizer, whole set of gas atomizer, whole set of equipment of vacuum gas atomizer( vacuum immediate frequency induction melting furnace included), rotary motion calcine kilnpatent awarded

粉体材料处理设备：金属粉末还原炉（推杆式、钢带式、网带式），氨分解发生器（可选配露点、流量反馈控制型），回转双圆锥真空干燥器，成套高压水雾化设备，成套气雾化设备，成套真空雾化设备（含真空中频熔炼炉，实现炉温反馈控制），回转锻烧炉。

TW-400CD falling to the ground style vacuum packer is specially designed for vacuum packaging of the thicker goods, its vacuum cover handtailor saving-labor gemel equipment has setting the laborious problem that had met by the additional gemel.

产品说明： TW-400CD落地式真空包装机是针对较大较厚物品的真空包装而特别设计的，该机的真空盖特制省力铰链装置解决了传统铰链费力问题，让使用者操作起来轻松、简单。

Consortium of major SVGA card manufactures (called Video Electronic Standard Association, VESA) was formed and then introduced VESA SVGA Standard.

在1992年最热门的事情就是Go，当时被认为是继个人电脑和视窗Windows之后的又一项进步。

We intend to bring to Shanghai samples of the best in Icelandic culture,science and commerce.

我们愿意为此次上海世博会带来冰岛最好的文化、科学和贸易。