材料

The reflection coefficient and refraction coefficient are also given; the analysis shows the versatility of the principle of least action ,Snell s law and Fresnell s law in the research on the left-handed material,and the negative refraction effect is explained.

研究了电磁波在左右手介质界面折射与反射的特性，给出了折射系数和反射系数，从另外一个方面探讨了最小作用量原理在左手材料中的适用性；从电动力学和最小作用量原理证明了Snell定律，验证了Snell定律在左手材料中的适用性，并且得到Fresnell公式在左右手材料中的一致性。

The described artificial fiber powder is made up by using artificial fiber through four-step pulverization process.

本发明的改性纺织材料及其制备方法利用粉碎而成的人造纤维粉末改变织物的物理性能和功能，有利于降低改性纺织材料的成本，使改性纺织材料的性能稳定。

The results showed that length from flag leaf pulvinus to spike base has the largest coefficient of variance of 42.1% and 37.2% in both DS and WW environments, respectively, while the spikelet per spike has the smallest CV of 6.4% and 5.7%. Under different water regimes, spike number per plant, effective spikelet per spike and peduncle length contribute a lot to the stable grain yield. Genetic diversity indices of DTI were from 1.95 to 2.07, with an average value of 2.02. Based on the DTI of agronomic traits, all accessions could be clustered into seven groups, the first and third groups are not sensitive to the water regimes, and the second group is more suitable for planting in dryland.

结果表明：在雨养和灌溉条件下，穗叶距的变异系数最高，分别为42.1%和37.2%，单穗总小穗数的变异系数最低，为6.4%和5.7%；不同水分条件下，植株稳产性主要受单株穗数、有效小穗数及穗下节长的影响；性状耐旱指数的多样性指数在1.95到2.07之间变化，平均值为2.02；根据性状耐旱指数将供试材料分为7个类群，其中第I、第III类群材料表现为对水分条件不敏感，而第II类群材料更适于在干旱条件下种植。

Use of new materials, new technology, the new formula, successfully developed a drug-free imports of polymer materials, gypsum-based environmental campaign joints powder, Goufeng powder, putty powder, fill our decorating materials sector a big blank, And adopted the designated testing organizations detection, green building materials obtained state certification.

采用新材料、新工艺、新配方，成功研制开发了以进口无毒高分子材料、石膏为基础的环保系列接缝粉、勾缝粉、腻子粉，填补了我国装潢材料界的一大空白，并通过了国家指定检测机构检测，同时获得了国家绿色建材认证。

The effects of material granularities on infrared radiancy and the whys are probed with the help of FTIR instrument through static and dynamic testings.

通过优选材料，借助傅立叶变换红外光谱仪对不同粒径的材料及其组成的发烟剂进行静态和动态测试，对发烟剂材料粒径影响红外辐射的规律及成因进行了研究。

Finally we can see the prospect of infrared radiating materials in the future.

概述了红外辐射材料的发展历程与现状，分析了红外辐射的基本原理，介绍了红外辐射材料在现实中的应用，展示了将来红外辐射材料的发展前景。

This dissertation mainly focused on the growth and characterization of GaN based materials grown by radio frequency plasma assisted molecular beam epitaxy.

本文研究了GaN和AlGaN/GaN材料的射频等离子体分子束外延生长及其特性，并对相关器件工艺中的若干重要问题如刻蚀、欧姆接触等，进行了初步探索。在前人工作的基础上，进一步优化了GaN材料的生长工艺，并深入研究了材料生长过程中的一些重要问题。

According to two hypotheses: one for the relation between the dynamic complex stiffness and the material dynamic characteristics, another for the relation between the static displacement and the force acting on the element, the predicting formula for rectangular cross section are obtained respectively using the static stiffness formulation from the beam——column theory and the G〓bel method.

利用粘弹性材料的标准导数和分数导数模型的本构关系，建立了动态储能和损耗模量函数的关系式，由材料特性实验确定其中的参数，按元件的动态复刚度和材料动态特性之间与元件静态位移与作用力之间的关系假定，依柱梁理论或G〓bel的方法建立的静刚度表达式，建立了矩形截面环元件的刚度和阻尼的预测公式。

Materials selection must now encompass a total engineering approach, by considering not only processing and properties, but also the maintenance, reliability, replaceability, and recyclability of a material.

不仅考虑加工和材料的特性，而且还要考虑某种材料的可靠性、可替换性和回收利用的可能性，现今对材料的选择必须包括整个工程学的方法。

Food packaging mainly consists of plastic bags, paper bags, aluminum foil bag, forcarbonated, oftinned ceramic bottles, cans, plastic film, and so on to the inner packaging and materials, as well as packs made of cardboard, plastic bins, requitement, etc and materials, these wrappers hazardous constituents is the effect of food quality, superstandard humans.

食品包装主要包括塑料袋、纸袋、铝箔袋、玻璃瓶、陶瓷瓶、马口铁罐、塑料薄膜等内包装及材料，以及纸箱、塑料桶、钢桶等外包装及材料，这些包装材料中的有害成分都可能因为超标影响食品质量，损害人体健康。

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！