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  cool
    The Characteristics of Na 2SO 4·10H 2O and its Application in Cool Storage Technology
    Na_2SO_4·10H_2O溶液的特性及其在蓄空调技术中的应用
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    The results showed that the relationship between pressing pressures and pressed densities of Mo powders under isostatic cool pressing accords fully with huang's formation theory.
    研究结果表明,Mo粉体在等静压中压制压力与压坯密度关系完全符合双对数压制理论;
短句来源
    For the Fisher particle size 3.3~3.6 μm and the loose density 1.6~1.8 g/cm3,the formation mechanism of Mo powders can be expressed to lgP=0.025+2.27lgln2ρ/(10.22-ρ) under isostatic cool pressing.
    Mo粉等静压压制规律为lgP=0.025+2.27lgln2ρ/(10.22-ρ)
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    Economical Technical Analysis of Air Conditioning Systems With PCM as Cool Thermal Storage Material
    PCM部分与全蓄空调系统的经济技术分析
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    Experimental Study on R134a Gas Hydrate as a Cool Storage Medium
    R134a 气体水合物蓄实验研究
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    Study on Load Prediction Model and Optimal Control of Ice Storage System
    冰蓄空调系统负荷预测模型和系统优化控制研究
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    Study on Key Technology of Air-Cooled Adiabatic Absorption Refrigeration
    小型风绝热吸收制关键技术研究
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    A HIGH VACUUM INSULATED THERMOSTAT CONTROLLED BY A THERMOSWITCH FROM 2K TO ROOM TEMPERATURE
    自2K至室温的直接导式真空绝热恒温器
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    A DESIGN STUDY OF DRY-COOLING SYSTEM IN POWER PLANTS
    电站空系统方案设计研究
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    X-Ray Diffraction Study on Cold-Drawn As-Spun Polyester Fibres
    拉伸无定形聚酯纤维的X射线衍射研究
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  cool
The climate changed from moderate-dry to cool-wet, and then to warm-wet in turn, and the lake level rose accordingly, showing the characteristic of a high lake level.
      
Investigation of the Effect of Electric Field on the Characteristics of Heat Transfer in a Combustion Chamber with a Porous Cool
      
A device is described that allows one to cool the sensitive element of a vacuum photoemissive device to the liquid-nitrogen temperature, thus improving the device resolution.
      
To cool it below room temperature, the unit uses thermoelectric converters based on the Peltier effect.
      
The refrigerators are designed to cool photodetectors or samples in experiments that do not require a high refrigerating capacity.
      
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The paper offers a new quick method for measuring the heat transfer coefficient of refrigerated transport mediums. Compared by some papers, both Chinese and foreign, this method has been proved to be more handy and accurate than conventional ones.The paper also deals with another now quick method-the heat content method, which has the advantages of both the heating and the cooling measuring methods, and which can bo used either to determine the heat transfer coefficient under working conditions (low temperature)...

The paper offers a new quick method for measuring the heat transfer coefficient of refrigerated transport mediums. Compared by some papers, both Chinese and foreign, this method has been proved to be more handy and accurate than conventional ones.The paper also deals with another now quick method-the heat content method, which has the advantages of both the heating and the cooling measuring methods, and which can bo used either to determine the heat transfer coefficient under working conditions (low temperature) without determining the refrigerating capacity, or to measure the actual heat transfer coefficient of heat-resistant Constructions impinged with water.In order to avoid the deficiency of other methods,a new testing method with Q/K as index is also suggested in this paper.This time-saving method can be used on the spot with ease.

本文提出一种快速测定藏运输工具传热系数的新方法.并根据部分国内外资料进行了核对,其结果表明,新方法比目前常用的方法方便、准确.文中还提出了另一种新的快速测试法——热容量法.这种方法兼有热法测试和法测试的优点,既可在不必测量制量的前提下,直接测定工作条件(低温)下的传热系数,又能测定使用过的含水隔热结构的实际传热系数.为了克服常用检验方法的缺点,还提出了以Q/K为指标的新检验方法.它可方便地在现场使用,而且费时较少.

Since mid-1950's, constant heat-flow quasi-steady method has been used for the measurement of thermophysical properties of materials containing moisture, but there are errors caused by the theoretical method itself and the unsatisfactory boundary conditions. This paper analyzes the limits of errors both for the ideal and for the worst boundary conditions. It is shown that in worst case when the same material as the specimen is used for terminal insulation layers, by keeping the Fourier number (Fo) within the...

Since mid-1950's, constant heat-flow quasi-steady method has been used for the measurement of thermophysical properties of materials containing moisture, but there are errors caused by the theoretical method itself and the unsatisfactory boundary conditions. This paper analyzes the limits of errors both for the ideal and for the worst boundary conditions. It is shown that in worst case when the same material as the specimen is used for terminal insulation layers, by keeping the Fourier number (Fo) within the limits 0.4 to 0.5, the theoretical error can be made to be less than 3%; plus the error in calculation of the heat content of the plane heat source, the total theoretical error will be 3.5%.——This can be taken as a limiting value of the theoretical errors of this method. The thermal-conductivitytest apparatus type NK-Ⅱ overcomes the troubles at cryogenic conditions, and solves the problems of quick and easy measurements of the thermophysical properties of engineering materials at such conditions. The testing arrangement, the recording curves and the result of a test on the thermal conductivity of the polyurethene foam are also shown. Although an industrial-type electronic potentiometer recorder is used, the overall maximum error is still less than ±8%.

恒热流准稳态法于五十年代中期起就用于测试含湿材料热物性,但在原理上及边界条件的实现上存在着理论误差。本文论证了理论误差的来源,并对理想的和最差的两类极端条件进行了计算。表明:在以试材本身作端面绝热层的极端情况下,如果控制傅利叶数F_0在0.4至0.5时,则理论误差小于3%;若加上修正平面热源的热容的误差,那么理论误差为3.5%。——这可作为本方法存在的理论误差的极限。南工Ⅱ型导热装置克服了把本方法用于深测试时的困难,比较满意地解决了工程材料低温热物性的快速简易测试问题。文中还介绍了测试装置、记录曲线和对聚氨脂的测试结果。即使用了普通的记录式电位差计,最大可能的综合误差仍小于±8%。

The temperature range of 77-40 K is acquired by reducing the saturation vapour pressure with liquid nitrogen as the cold resource. The pressure reduction is realized by means of the mechanical pump 2X-8 and the absorption pump of molecular sieve. The limit temperature obtained is 40.4 K, corresponding to the saturated vapour pressure of 6 ×10-2 mm Hg.

本文叙述了以液氮作为源,用降低饱和蒸汽压(减压)的方法,获得77—40K温区。减压是借助于2X-8机械泵和分子筛吸附泵进行的。得到的极限温度为40.4K;相应的饱和蒸汽压为6×10~(-2)mmHg。

 
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