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导热系数小
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  conduct heat coefficient low
     On the analysis of two kinds roof structures (tile pin slope roof and tile roof) on the heat insulator material choose,it is pointed out that the heat insulator should be material with volume,density and conduct heat coefficient low,moisture and absorbed water rate low,nonflammable or flame retardant or flame proof.
     文中就瓦材钉挂型坡屋面和瓦材泥背粘铺型坡屋面两种屋面结构形式对保温材料的选择进行阐述 ,明确提出 :保温材料应选择体积密度和导热系数小、含水率和吸水率低、不燃、难燃、阻燃的高效保温材料 ;
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  smaller thermal conductivity coefficient less
     Compared with traditional construction materials,ceramicsgrain concrete possesses the advantages of smaller thermal conductivity coefficient,less weight and better structural performance.
     与传统的建筑材料相比,陶粒混凝土具有导热系数小、重量轻、结构性能好等优点。
短句来源
     Comparing with traditional construction materials,the ceramic grain concrete possesses the advantages of smaller thermal conductivity coefficient,less weighty and better structural performance.
     与传统的建筑材料相比,陶粒混凝土具有导热系数小、重量轻、结构性能好等优点.
短句来源
  small thermal conductivity
     The small hollow concrete block using expanded perlite as aggregate has many advantages as follows: high volume density and small thermal conductivity, excellent thermal insulation and sound insulation properties , high monolithic strength, less dry shrinkage and good freeze resistance.
     用膨胀珍珠岩作集料制成的混凝土小型空心砌块的体积密度和导热系数小,具有良好的保温、隔热、隔音的特性,而且整体强度高,干燥收缩小,抗冻性能好.
短句来源
     The changes of the thermal conductivity of CZP 、CM and CMS composition in NZP familyceramics with temperature were studied. The phonon mean free path of CZP, CM and CMScomposition was calculated. It was found that complex structure and composition of NZP familyceramics are the main reason of resulting in their small thermal conductivity
     测定了NZP陶瓷中CZP、CM、CMS三种组成的导热系数随温度的变化,计算了三种组成的声子平均自由程,认为复杂的结构与组成是NZP陶瓷导热系数小的主要原因.
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  “导热系数小”译为未确定词的双语例句
     This castabale is developed by using high quality light mullite as main material and bound with low cement binder.
     选用优质的轻质莫来石为主要原料,采用低水泥结合的形式研制生产的这种浇注料,具有施工性能优良,高温性能好,导热系数小等优点。
短句来源
     A numerical simulation on the cavitations bubble motion was done employing by Matlab and the influence on the acoustic cavitations of many correlative parameters was discussed.
     气体导热系数小空化效果更好。 数值模拟结果证明:超声波功率、气泡内压、气泡直径对空化气泡的运动影响较大。
短句来源
     In concrete structure, due to coefficient of conduction for concrete is small, when external environment changes sharply, the change for internal temperature has distinct hysteresis.
     在混凝土结构中,由于混凝土导热系数小,外部环境急变时,内部温度变化存在明显的滞后现象。
短句来源
     Describes the features, producing process of buried thermal insulated pipe with thermal wound. Gives its product testing results, compares its technologic and economic characters with conventional methods, and forecasts its prospects of application.
     介绍了用热缠绕法生产直埋管技术的特点、工艺流程及产品检测结果,比较了热缠绕法与国内常规生产方法的技术经济性,认为前者具有导热系数小、保温性能好、湿热老化年限长、施工工期短、使用方便、综合经济效益好等优点,通过工程实践,预测热缠绕保温管发展前景广阔。
短句来源
     Because TC4 alloy has low heat conductivity,high heat plasticity and good oxidability,low welding parameters should be selected.
     由于TC4钛合金导热系数小 ,热塑性高 ,容易氧化 ,摩擦焊亦选用较小的规范参数。
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      small thermal conductivity
    We show that the coupling described in the first case is not enough to make asymptotically the effective temperatures of the two interacting subsystems equalize, the reason being the too small thermal conductivity between them in the aging state.
          
    The building envelopes studied in this work consist of lateritic soil bricks with incorporation of natural pozzolan or sawdust in order to obtain small thermal conductivity and low-density materials.
          
    And HTS bulk which is ceramic itself has remarkably small thermal conductivity than metal material.
          
    On the other hand, the bulkhead is given small thermal conductivity, preventing heat transfer at the bulkhead by conduction.
          


    The heat conduction problem is transformed into an algebraic eigenvalue problem which can be solved very simply by a perturbation method, the perturbation parameter being the small ratio between the coefficients of heat conduction in the gas and in the solid.

    本文讨论固体导热问题中偏心圆柱形气缝所引起的影响。我们利用二维拉普拉斯方程线性迭加解与复变函数的级数展开之间有对应关系,把热传导方程连同边界条件的定解问题变化成线性代数的一个本征值问题,它的本征值表示气缝内外界面沿圆周方向平均温度的差值,它的本征矢量则表达气缝内外界面上温度的角分布。由于气体导热系数比固体导热系数小很多,所以用微扰方法容易把本征值算到一级近似,零级近似的本征矢量可以从等温圆柱形界面气缝导热问题的熟知的保角变换解得到,这样便简单地给出偏心对气缝内外界面沿圆周方向平均温度的差值的影响。如果气缝的偏心是随机的,结果如何统计处理,在本文末节也讨论到。

    This article describes the development of a capacitance sensor used as a sensitive element cf a capacitive type crycgenic liquid level gauge. The cperation principle, the construction principle, the construction design, the test and the usage of it are described. The outer diameter of the sensor is 10 mm, measuring range-0~1000mm, insulance between electrodes-more than 20 megohm, liquid helium loss from heat leak of the sensor-less than ll/24h. The joint of octal scket and nylon connection can resist the vacuum...

    This article describes the development of a capacitance sensor used as a sensitive element cf a capacitive type crycgenic liquid level gauge. The cperation principle, the construction principle, the construction design, the test and the usage of it are described. The outer diameter of the sensor is 10 mm, measuring range-0~1000mm, insulance between electrodes-more than 20 megohm, liquid helium loss from heat leak of the sensor-less than ll/24h. The joint of octal scket and nylon connection can resist the vacuum of lx10~(-6) tcrr. The compensation wire for calibrating zero level is fitted in the leading tube of the inner electrode,so that the effect of distributed capacitance change of electrode leads to the measurement can be minimized. The connection between outer electrode and octal socket is made of nylon, which has low thermoconductivity. Therefore, the liquid helium loss from heat leak is reduced. After repeated tests it is proved that the structure is reasonable and the performance of the sensor is stable and reliable at 4.2 K. The error in liquid level measurement is±2% for helium and ±1% for nitrogen if the level is kept calm in Dewer. This has already met the requirements for continuous level measurements of liquid helium and nitrogen in cryogenic engineering and experiments.

    本文介绍了电容式低温液面计的敏感元件——电容传感器的研制。对其工作原理、结构、实验和使用等方面做了叙述。电容传感器具有结构简单、体积较小、工作可靠、绝缘性能好、漏热小以及使用方便等优点。在内电极引出管中,增加了零位电容补偿线;在外电极与八芯密封插座之间,采用了导热系数小的尼龙材料做连接座。提高了电容传感器的性能,减小了探头上部漏热对液氦的损耗。

    Thig article describes the development of a capacitance sensor. This is a sensitive element of a capacitive type cryogenic liquid level gauge YR-80-Ⅱ The principle of operation, the construction and the assembly are described. Based on many test, a capacitance sensor with small demension, simple construction and little heat leak has been made. The sensor can be used at 4. 2 K. The error in liquid level measure merit is ± 2% for helium and ±1% for nitrogen if the level is kept calm in Dewer.

    本文主要介绍了“YR—80—Ⅱ型电容式低温液面计”的一次敏感元件——电容传感器的研制和设计情况。对电容传感器的工作原理、结构设计、装配工艺等方面做了比较详细地叙述。电容传感器探头外径为φ10mm、测量范围0~1000mm、漏热对液氦的损耗量为0.75 1/24h、内电极,外电极以及零位电容补偿线之间的绝缘电阻大于20MΩ。在内电极引出管中,增加了零位电容补偿线,较好地克服了内电极引线分布电容变化对液面测量的影响;在外电极(外管)与八芯密封插座之间,采用了导热系数小的尼龙材料做连接座,减小了电容传感器上部漏热对液氦的损耗。

     
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