材料

A new method is described for determining the microwave dielectric properties of solid materials,for example agricultural products,mineral,of known densities from the dielectric properties of pulverized samples measured by employing the short circuited waveguide principle at a few different bulk densities.

本文介绍一个测定不能进行机械加工的&坚实材料&的微波介电特性的新方法。将这类材料研碎，成为&空气－粒子&混合物。应用短路波导方法，在几个不同的混合物&松密度&上测量其介电特性。当已知待测材料的&坚实密度&时，利用这些测量的特性与混合物&松密度&的线性函数关系进行&外推&，从而获得&坚实密度&下的农产品的微波介电特

The experimental results show that microwave sintering promotes the densification of green compacts with higher heating rate and reduced sintering cycle. The sintered relative density of 99.8% can be achieved during microwave processing under appropriate conditions. In addition, microwave sintering improves the uniformity and homogenization of W grain size, and yet leads to growth of W grain. Fe sintering aid degrades the microstructure uniformity and further coarsens W grains. The present investigation demonstrates the feasibility of applying microwave sintering technique to consolidate W-Cu composites and its promising outlook in reducing production cycle and cost.

结果表明：微波烧结升温速度快，周期短，能促进W-Cu材料的致密化；在适当条件下，微波烧结能获得相对密度达99.8%的W-Cu样品；微波烧结能改善W-Cu样品中两相分布的均匀性和W晶粒尺寸的一致性，但引起W晶粒的快速长大；Fe烧结助剂导致W-Cu材料显微组织均匀性变差，并引起晶粒进一步粗化；微波烧结技术能够应用于W-Cu材料的制备，在缩短生产周期、降低生产成本方面具有潜在优势。

As a result, Ti3SiC2 can be used as commutating brushes for AC motors, turbine blades and stators for air engines, and electrodes for metal melting.

因此，Ti3SiC2可用作交流电机的电刷材料，航空发动机的涡轮叶片、固定子材料和金属熔炼的电极材料等。

The results show that the mechanical properties of this PMMA depend strongly on the testing temperature. The Young's modulus and flow stress were found to decrease with increasing temperature at low strain rate. At the strain rate of 10^(-1) 1/s, strain soften was observed under all experiment temperatures. At high strain rate, with the temperature increase, the flow stress deceases remarkably while the failure strain increases, and the strain softening was also observed at the temperature above 333K.

试验结果表明：在准静态载荷下，随着温度的升高，材料的弹性模量和流动应力减小，在应变率为10^(-1) 1/s时表现出明显的应变软化行为；在高应变率(550 1/s)下，随着温度的升高，材料的流动应力逐渐减小而破坏应变增大，当温度超过333K时也有应变软化现象发生；在相同温度下，随着应变率的升高，材料的流动应力增大，但破坏应变减小。

The influence of nanocrystalline particles and catalysts on the hydriding and dehydrogenating properties of magnesium-based hydrogen storage materials are summarized in this paper.

总结了纳米晶、催化剂改性等对镁基储氢材料吸放氢性能的影响，介绍了不同镁基储氢复合材料的吸放氢性能以及基于密度泛函理论的第一原理计算方法在镁基储氢材料吸放氢性能方面所做的一些基础理论研究，指出随着量子化学、凝聚态物理等学科以及计算机技术的发展，理论计算方法在研究镁基储氢材料吸放氢性能方面的作用将越来越重要。

Researchers from the University of York and Hull University in Yorkshire had 45 osteoarthritis sufferers over age 50 wear four types of bracelets (copper, a weak magnet, a stronger magnet and a demagnetized strip) for four weeks each.

来自英国约克郡约克大学与赫尔大学的研究人员，让45位年龄在50岁以上的骨关节炎患者佩戴了四种类型的手镯（分别用铜、弱磁材料、磁力较强材料和去磁材料制成），每一种佩戴四个星期。

It's a compound of natural polar mineral material and multifunctional ceramic material can be more effective with far infrared rays that was eradiated by natural polar mineral.

它是由多种天然极性矿物材料和多功能健康材料复合而成，并添加稀土元素，与天然矿物材料辐射的远红外线性能协同增强。

It's a compound of natural polar mineral material and multifunctional ceramic material can be more will with far infrared rays that was eradiated by natural polar mineral.

它是由多种天然极性矿物材料和多功能健康材料复合而成，并添加稀土元素，与天然矿物材料辐射的远红外线性能协同增强。

The analytical characteristic and the regulation for the direct analysis of advanced ceramic in slurry sampling/fluorinating assisted electrothermal vaporization-ICP-AES were studied in detail; The possibilities of simultaneous determination for elements with different volatility were inspected also, a high sensitive and effective method for the direct analysis of ceramic powder has been described.

详细研究了悬浮体制样/氟化电热蒸发-ICP-AES直接分析先进陶瓷材料的分析性能及其规律性，考察了同时测定陶瓷材料中不同挥发性的痕量元素的可能性，提出了一条高灵敏、高效率的陶瓷材料直接分析新途径。

The gelling time, thermal stability and mechanical property of this material were studied.

针对目前矿井密闭填充材料在应用中的局限性，采用双溶液混合法制备了新型水凝胶密闭填充材料，研究了该材料胶凝时间影响因素、热稳定性与力学性能等。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！