查询词典 vacuum

In case of bigger air capacity,vacuum value in vacuum can lower than lower limit a long time ,If the pump cannot meet demand,other of pumps will automatic start ,until to run over upper limit Two vacuum pumps may be changed for manul start and stop

如因工作需求气量较大，真空罐内真空度低于下限值超过一定时间，而单向真空泵不能将罐内真空度抽至下限以上时，另一台真空泵将自动启动，直到超过上限。

If there is joint on the back, in the lower right or fill a 20% discount after it has been causing wrinkles without distortion; vacuum packaging vacuum after the contents of the packin mouldedround radiofrequent nonanatomical tridimension on the surface, shape, surface roughness, would create a bar code reading of deformation cannot, therefore, be appropriate for the vacuum packing inner bag direct business card printing and membership card to make a bar code, you can increase the packin business card printing outside and membership card to make a bar code, and other graphics and text.

如背面中央有接缝，则印在右下方或印在填充后不起皱折、不变形处；真空包装抽真空后包装袋紧贴在内容物表面，呈不规则立体形状，表面不平整，会造成条形码变形不能识读，因此真空包装内袋不宜直接制卡和会员卡制作条形码，可增加一个外包装袋制卡和会员卡制作条形码及其他图文。

The theory of Quantum Chromo-Dynamics, which describes the strong interactions, has two different vacuum states—perturbative vacuum and physical vacuum.

强相互作用的基本理论量子色动力学有微扰真空和物理真空两种不同的真空态，带色的夸克和胶子不能在通常的物理真空中运动，而只能被禁闭在色中性的强子中。

De-airing pugmill,vacuum pug,vacuum pug mill,vacuum deairing machine

真空练泥机，真空挤泥机

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。

On the base of practical transformer substation main connection,electriccomponents and system circuit model are first formed in the paper;analyze vacuum arccharacteristic and medium resume are analyzed,then,according to vacuum chamberphysical process of switching AC arc,resume process are divided into three stages:sheathdevelopment,neutral particles diffusion and static characteristic,with that,calculatingmodel of medium resume strength is erected and applied in the computing of vacuumcircuit breaker interrupting transform overvoltage;In the paper,Saber software is used tosimulate a whole switching process;As follows,overvoltage characteristic of vacuumcircuit breaker switching no load and load transformers,kinds of influence factors areanalyzed in detail;At last,vacuum circuit breaker switching capacitance groupovervoltage formative causes and electrode refining for lessening reignition are discuss.

本文针对中低压变电站的实际主接线建立各电气元件及系统的电路模型；在真空电弧的特点及间隙的介质恢复特性上，依据真空断路器灭弧室分断电弧的物理过程，将真空电弧熄灭后的恢复过程分为鞘层发展、中性粒子扩散和静态特性三个阶段，建立了相应的介质恢复强度的计算模型，应用到切除变压器作过电压的计算中；采用Saber仿真软件模拟计算真空断路器切除变压器作过电压；并分别对真空断路器切除空载及负载变压器作过电压的特点与影响作过电压的各种因素做了详细的分析；最后简要分析了真空断路器开断电容器组过电压的形成原因及为减少重燃的电极老炼措施。

On the base of practical transformer substation main connection,electriccomponents and system circuit model are first formed in the paper;analyze vacuum arccharacteristic and medium resume are analyzed,then,according to vacuum chamberphysical process of switching AC arc,resume process are divided into three stages:sheathdevelopment,neutral particles diffusion and static characteristic,with that,calculatingmodel of medium resume strength is erected and applied in the computing of vacuumcircuit breaker interrupting transform overvoltage;In the paper,Saber software is used tosimulate a whole switching process;As follows,overvoltage characteristic of vacuumcircuit breaker switching no load and load transformers,kinds of influence factors areanalyzed in detail;At last,vacuum circuit breaker switching capacitance groupovervoltage formative causes and electrode refining for lessening reignition are discuss.

本文针对中低压变电站的实际主接线建立各电气元件及系统的电路模型；在真空电弧的特点及间隙的介质恢复特性上，依据真空断路器灭弧室分断电弧的物理过程，将真空电弧熄灭后的恢复过程分为鞘层发展、中性粒子扩散和静态特性三个阶段，建立了相应的介质恢复强度的计算模型，应用到切除变压器操作过电压的计算中；采用Saber仿真软件模拟计算真空断路器切除变压器操作过电压；并分别对真空断路器切除空载及负载变压器操作过电压的特点与影响操作过电压的各种因素做了详细的分析；最后简要分析了真空断路器开断电容器组过电压的形成原因及为减少重燃的电极老炼措施。

The wrappage placed into a vacuum chamber of channels, within the allotted time by changing the vacuum chamber of vacuum to determine the degree of wrappage of leakage and naiso object protective packaging test.

将包装件放入真空室的水槽内，在规定时间内通过改变真空室的真空度来评定包装件的渗漏程度和包装内装物保护能力的试验。

At a certain point in the suction cycle after the vacuum inlet, a defined amount of fresh air is let into the pump through the second suction opening from the atmosphere, thus allowing the pump not only to produce a good vacuum, but simultaneously produce a very high blast air flow even after the vacuum has been generated.

复合泵额外配有一个被称为&二次吸收&的风口。在真空进程之后的吸气循环一个特定点上，确定数量的新气体通过二次吸收口从大气进入泵体，从而使泵不仅产生良好的真空，而且在真空形成的同时产生压力很高的吹送气流。

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。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。