真空的

The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源，通过Simulink仿真和试验检验其满足设计要求，实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出；利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集，通过异步串行通信实现单片机与计算机之间的数据通信，将检测数据传至上位机；在上位机利用Matlab开发人机交互界面，实现相关数据处理和图形显示，包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

Yongkang perfect daily-use products factory located in the scenic mountains Zhedong - Fangyan, is a professional production of stainless steel vacuum cup manufacturers, product varieties, novel styles, good insulation properties, each "Shengyuan" brand vacuum Cup have been the overall high level of high-temperature vacuum, from production to a factory, must be 5 Strict testing procedures, thereby ensuring that each carrier only to consumers of "Shengyuan" vacuum cup insulation performance and overall quality.

永康市完美日用制品厂座落在风景秀丽的浙东名山－方岩，是一家专业生产不锈钢真空杯的生产厂家，产品品种多，款式新颖，保温性能好，每只"盛源"牌真空杯都经过高水平的高温整体抽真空，从制作到出厂，必须经过五道严格的检验程序，从而确保了每一只输送到消费者手中的"盛源"真空杯的保温性能和整体质量。

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。

First by testing the practical multilayer insulation in a cryogenic tanker, which is the carilometer in my paper,some affecting factors on multilayer insulation are analysed, then by using the low-temperature and vacuum environment caused by multilayer insulation, the effective thermal conductivity of multiple fiber paper with 5 layers is tested.Through Newton interativemethod,an empirical formula is deduced to computer the thermal conductivity of fiber paper,The errors between experimental thermal conductivity and the calculated conductivity by empirical formula are below10%,so the formula of fiber conductivity can be applied to practical enginnering.

为探索改善工程应用中高真空多层绝热层绝热性能的方法，本文实验研究中首先测量了包扎在实际低温储罐上不同结构的高真空多层绝热层的绝热性能，并分析了环境温度、环境压力，层数、不同隔热材料的组合等因素对工程应用中的高真空多层材料绝热性能的影响；然后利用多层绝热层中的低温真空环境测量5层干法纸在不同温度区间内的表观导热系数，在有限实验数据的基础上用牛顿迭代数值拟和出计算5层干法纸表观导热系数的经验公式，对比经验公式计算值和实验测量值，发现二者的误差在10%以内，因此在工程应用中可用本文的经验公式计算干法纸在低温下的导热系数。

Both high and low vacuum detection, three alarm output relays, three-digit display

警开关能检测高真空及低真空，带三个报警信号的继电器，三个Hg的真空

By using a self-made CCD Optical Transient Image System , the vacuum arc images of long gap (40 mm) at various moments are taken photos, and the regular pattern of the vacuum arc mode transition is studied.

应用设计制作的真空电弧图像瞬态摄像系统，对长间隙下（开距40mm不同时刻的真空电弧图像进行了拍摄，获得了真空电弧形态演变过程。

The paper presents the technical status mine explosion-proof electrical apparatus of mine flame-proof type vacuum feed switch,mine flame-proof type with intrinsically safe vacuum electromagnetic stater,mine flame-proof type high voltage vacuum distribution device and mine flame-proof type movable transfermer substation,And it analyzes from parameters,electrical system and the structure.

简要介绍了矿用隔爆型真空馈电开关、矿用隔爆兼本质安全型真空电磁起动器、矿用隔爆型高压真空配电装置、矿用隔爆型移动变电站等主要煤矿防爆电器的技术现状，并从参数、电气系统及结构等方面进行了初步的分析。

Aoxin companies in a number of companies and technical personnel, engineers, based on staff work together to set up, is now leading a new generation of vacuum Impregnation, Impregnation vacuum drying, vacuum pressure Impregnation and drying oven and a small vacuum Impregnation machines and other users all over the world to the nation as well as to promote safety, environmental protection, energy saving, reliable, and inexpensive high-quality equipment.

奥鑫公司是在多家公司技术人员、工程师员工共同努力的基础上建立起来的，现以一流的新一代真空浸漆、真空浸漆烘干、真空压力浸漆和干燥箱及小型真空浸漆机等向全国乃至全世界用户推广安全、环保、节能、质量可靠、质优价廉的设备。

Presently there exists no convenient method to determine the baking temperaiure for glass vacuum chamber which uciuall plays an important role in the acement of required vacuum circumstance in high-vacuum system made of glass,In this paper approximate method was represented to calculate the baking temperature of glass surface by the emissivities of appropiate materinl surface,determining the baking temperature difficult to be tested by the relation ship recommanded by the paper and the indication of an ausa...

在高真空系统中，真空室的烘烤温度对获得要求的真空氛围有着重要的影响，对于玻璃制作的真空系统，目前对于该温度的确定缺少一种较为简单易行的方法，本文基于辐射换热分析提出了具有通用性的利用材料表面辐射率来计算玻璃表面烘烤温度的近似方法，将这难以直接测量的温度通过附设热电偶的示值和本文推荐的关系式来确定，于实际情况相比较为吻合。

According to environmental protection, the vacuum system of post polymerisation of imported nylon66 industrial yarn was modified.

由于环保要求，对原进口的尼龙66工业原丝后聚合器抽真空系统进行了改造，用水力喷射抽真空系统代替了原先的由燃煤锅炉生产的蒸汽喷射抽真空，并实现了对真空度的精确控制。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。