查询词典 temperature conductivity

In the investigation,the finite-element software ANSYS was adopted to simulate the temperature field,and the effects of heat conductivity,specific heat and some boundary conditions such as sunlight radiancy and wind speed on the temperature field were analyzed.

应用有限元软件ANSYS对温度场进行模拟，分析了太阳辐射、风速等边界条件和导热系数、比热等计算参数对温度场的影响，并提出了相应的建议值。

Finally, the curve of between temperature and thermal conductivity at low temperature has been obtained.

根据试验，讨论了低温热导率的影响因素如温度、密度、吸水率等。

Effective heat capacity method was used to simulate heat transfer of freezing phase change growth in the metallic foams at the third boundary condition. The average temperature distributions vs. time in the metallic foams were obtained. The results showed effects of different porosity and thermal conductivity on the temperature distributions.

采用显热容法模拟了第三类边界条件下泡沫金属中水的冻结相变传热过程，得到了泡沫金属中骨架和流体的温度分布及其平均温度的变化，分析了不同骨架导热系数及不同孔隙率对介质温度分布的影响。

In this thesis, the engineering property of the frozen earth in the frozen railway roadbed in Anduo section (between DK1561+975-DK1562+530) of Naquhe region of Qinghai-Tibet railway was studied indoor. The change of engineering property of the earth samples with different water content , density and temperature were researched. The influence of concentration of the diffluent salt to the frozen strength was pilot studied. The thermal conductivity of the soil was experimented. With the result and data of the tests, the earth temperature field in Anduo section was demonstrated by numerical analysis, the structure parameter of the spall revetmentd and the rubble berm was given, the stability of the railway roadbed was evaluated.

本文以青藏铁路格尔木-拉萨段那曲河地区安多段(DK1561+975～DK1562+530)冻土路基为对象，对该地区冻土的工程性质进行了室内试验研究；对不同含水率、不同压实度的土样，研究在特定温度变化范围内工程性质的变化：初步分析了易溶盐含量对冻结强度的影响：测试了土样的导热系数；在室内土工试验的基础上，根据测试结果和数据，对安多段区域地温场进行了数值模拟，分析了该工点区间内合理片石护道、碎石护坡结构参数，评价了路基稳定性。

The results indicate that the different thermal expansions and elastoplastic properties and distributed randomness of various mineral particles composed of oil shale will lead to the nonuniformity of thermal field, deformation field and stress field in heating process, which makes the particles of oil shale deform incompatibly: and the release of product pyrolysis results in irreversible damages of oil shale material and structure. These are the main reasons for the thermal fracture of oil shale. When oil shale is heated through thermal conduction, temperature transfers slowly, so the spacing between heating well and production well should not be kept too long. When difference exists in oil shale reservoir's properties, heating well should be chosen in the high conductivity region. Oil shale's stratification is vital for developing permeation zone in in-situ retorting. Oil shale will generate additional expansion force as it reaches its pyrolysis temperature, and stratification will be cracked first, so the oil shale stratification should be utilized to enhance its permeability.

研究结果表明：组成油页岩各种矿物颗粒热膨胀和弹塑性性质的不同及其分布的随机性，导致油页岩加热过程中温度场、变形场和应力场的非均匀性，使得油页岩颗粒间变形不协调和油页岩热解产物释放引起油页岩材料与结构性能发生不可逆的劣化损伤，这是油页岩发生热破裂的主要原因；热传导方式加热油页岩，温度的传递比较缓慢，加热井和生产井的间距不宜过大，对油页岩储层性质存在差异时，注热井应选择较高热导率的区段；油页岩的层理对油页岩地下原位开发形成渗透带至关重要，油页岩达到热解温度会产生附加的膨胀力，首先在层理处开裂，应充分利用油页岩层理赋存条件改造其渗透性。

In this paper, based on the experimental data of maize, sunflower, Acacia confusa and Leucaena glauca under various treatments of air and soil temperature as well as soil water content, the effects of soil water content and temperature on plant root hydraulic conductivity were analyzed.

本文根据不同大气环境温度和土壤温度及不同土壤含水率处理条件下的玉米、向日葵、台湾相思、银合欢的试验资料，分析了土壤水分和温度以及土壤水分与温度共同作用对植物根系水分传导的效应。

And research shows that high thermal conductivity composite can decrease the temperature difference of underfill between chip and substrate, so that it can improve the temperature distribution of the flip chip, decrease the thermal stress of underfill and increase packaging reliability.

表明高导热系数的底充胶可明显降低在芯片和基板之间的温度差，降低底充胶的热应力，进而提高电子封装的可靠性。

Tungsten wire is made by the process of sintered bar, swaging and drawing. Besides its high temperature stability, sagging free, shock resistance and corrosion resistance, it has an excellent electrical and thermal conductivity, a very low thermal expansion up to the highest temperature.

钨丝是由钨坯条经过旋锻及拉伸的方法加工而成的，具有很好的耐高温性能和不下垂性，导电导热性能极好，热膨胀率低，成型性好、稳定性高、耐震性及抗腐蚀性强，具有较好的机械加工性能。

Thermal Barrier Coatings is a kind of ceramic layer of excellent high temperature oxidation resistance as well as very low thermal conductivity, which is deposited onto the surface of substrate by the assistant of bond coat layer. TBCs can effectively reduce the service temperature of the protected substrate, alleviate the thermal shock loading, reduce the requirement for cooling air, and so, the thermal efficiency of apparatus is improved. Therefore, TBCs have been widely used in the fields of space flight, chemical industry, and metallurgy or energy sources industry.

热障涂层(Thermal Barrier Coatings，简称TBCs)是一种陶瓷涂层，具有优良的抗高温氧化和非常低的热传导系数，它通过粘结层沉积在耐高温金属或超合金的表面，可以有效降低被保护基材的服役温度，减轻其热冲击载荷，降低对冷却空气的需求，提高器件的热效率，从而被广泛应用于航空航天、化工、冶金和能源等领域。

The calculation results show that the temperature of the valve cone changes periodically, leading to thermal stress changes periodically, which is the main reason of the valve cone pit corrosion; the operating temperature of the valve can be reduced by using the higher thermal conductivity materials; at the Same time, 3-D FEM provides a good theoretical basis in the process of the design and improvement for the parts of ICE.

计算结果表明：气门锥面处周期性的温度变化，会导致周期性变化的热应力，是导致气门锥面疲劳点蚀的主要原因；采用较高导热系数的材料可降低气门的工作温度；同时，三维有限元法能为内燃机零部件的进一步设计改进提供很好的理论依据。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。