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The results show that glass ceramics with thermal expansion coefficient of 5.11×10^(-6)℃, major phase of α-cordierite and ε=5.5, tan σ=2.1×10^(-4) can be prepared by the addition of 3.6% alkalis (Li2O+Na2O), and Li2O occupies 1.8%. With Li2O substitution for Na2O, spontaneous crystallization is obviously enhanced, and temperature of the first crystallization peak decreases from 950℃ to nearly 900℃, but the crystallization temperature of the second peak was not varied. With the increase of Li2O content, mixed alkali effect can be observed from the thermal expansion coefficient and dielectric loss curve which decreases first and then increases. Dielectric constant decreases monotonously with the increase of Li2O content.

研究结果表明：Li2O和Na2O总含量为3.6%，其中Li2O含量为1.8%时，微晶玻璃以α-堇青石为主晶相，热膨胀系数为5.11×10^(-6)℃，微波频率下介电常数ε为5.5，介电损耗tanσ为2.1×10^(-4)；随着Li对Na的取代，玻璃的析晶能力增强，初始析晶峰温度从950℃降至900℃左右，但没有降低第二析晶峰温度；随着Li2O含量增加，热膨胀系数及介电损耗都出现明显的混合碱效应，曲线呈现先降低后升高的变化趋势；样品的介电常数随Li2O含量增加单调降低。

The results show that glass ceramics with thermal expansion coefficient of 5.11×106 ℃, major phase of α-cordierite and εr=5.5, tan σ=2.1×104 can be prepared by the addition of 3.6% alkalis(Li2O+Na2O), and Li2O occupies 1.8%. With Li2O substitution for Na2O, spontaneous crystallization is obviously enhanced, and temperature of the first crystallization peak decreases from 950 ℃ to nearly 900 ℃, but the crystallization temperature of the second peak was not varied. With the increase of Li2O content, mixed alkali effect can be observed from the thermal expansion coefficient and dielectric loss curve which decreases first and then increases. Dielectric constant decreases monotonously with the increase of Li2O content.

研究结果表明：Li2O和Na2O总含量为3.6%，其中Li2O含量为1.8%时，微晶玻璃以α-堇青石为主晶相，热膨胀系数为5.11×106 ℃，微波频率下介电常数ε r为5.5，介电损耗tan σ为2.1×104；随着Li+对Na+的取代，玻璃的析晶能力增强，初始析晶峰温度从950 ℃降至900 ℃左右，但没有降低第二析晶峰温度；随着Li2O含量增加，热膨胀系数及介电损耗都出现明显的混合碱效应，曲线呈现先降低后升高的变化趋势；样品的介电常数随Li2O含量增加单调降低。

The back pressure of condenser makes a great impact on its thermal efficiency and the economy of thermal system. However, its main task is to set up and maintain a certain vacuum degree for air extraction outlet of steam turbine.

汽轮机的背压对其热效率和热力系统的经济性有很大的影响，而凝汽器的主要任务就是为汽轮机排汽口建立并维持一定的真空度。

Power and mechanical engineering ; steam turbine ; steam extraction pressure loss ; thermal efficiency ; thermal system

动力机械工程；汽轮机；抽汽压损；热经济性；热力系统

This paper introduces several common ventilation schemes of thermal power station s main workshops, puts forward the ventilation scheme suitable for thermal power station s main workshops in cold areas, that is natural air-intake, natural+mechanical air-exhaust by roof axial fan .

本文介绍了几种常见的火电站主厂房通风方案，提出了适合于严寒地区火电站的主厂房通风方案：即自然进风、自然+屋顶轴流风机机械排风。

Mn-Zn ferrites possess excellent thermal sensitivity,and can be widely used as thermal sensor in many fields.

锰锌铁氧体具有优良的热敏性能，作为热敏传感器能广泛用于许多领域。

To the special request to polish the ashes of the circulation fluidized bed boiler in the thermal power station in Gao Keng,an automatic machine has been designed which can meet the demand of the circulation fluid bed pot fire grate dregs quantity big and continual,which can not only improve the thermal efficiency,operate safely and stably but alleviate the work strength and operating fees.

针对高坑电厂循环流化床锅炉对排渣的特殊要求，设计应用一种自动排渣器，能满足循环流化床锅炉排渣量大且连续的要求，使锅炉既提高热效率，安全稳定运行，又能减轻工人劳动强度，减少运行费用。

Obviously the thermal conditions of dies and die castings and the fluid flow of liquid metal have critical influence on the quality of casting product, the production rate and the die life. Hence, computer numerical simulation has become an efficient tool to analyze as well as to control the thermal and fluid flow fields in die casting process.

压铸过程的温度场和流场是影响压铸产品质量、生产率和模具寿命的重要因素，计算机数值模拟技术为压铸温度场和流场的研究提供了有效的手段，同时也为压铸工作者控制压铸温度场和流场提供了有力的工具。

A wall heat flux function was introduced to separate the numerical prediction of internal heat transfer in aircraft from that of thermal effects outside the skin.The thermal network method combined with the Monte Carlo method was used to analyze the internal heat transfer and the FLUENT code was employed to simulate the aerodynamic convection outside skin.

引入壁面热流函数，将蒙皮外部热环境与飞机内部换热进行解耦计算，采用热网络法与蒙特卡罗法进行飞机内部传热分析，利用FLUENT软件进行蒙皮外气动对流换热模拟，建立了飞机蒙皮瞬态温度场的数值方法。

In order to realize nano feeding under large feeding force, according to the research existing state of nano feeding device all over the world and development tendency of this technical in developed country, a nano precision feeding scheme based on thermal deformation is presented, the mathematic modal of nano drive parts based on metal thermal deformation is established and stepped exponential fitting method is presented which can determine the parameters of modal.

为了在较大的进给力下实现纳米级进给，根据国内外纳米级进给机构的现状及国外工业发达国家该技术发展趋势，本文提出一种基于热变形的纳米级进给控制方案，建立了基于金属变形体热变形的纳米级进给部件的数学模型，并提出了确定模型参数的方法——分段指数拟合方法。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。