查询词典 diffraction

The luminescent property of these materials was relative to the twisted angle between two benzene rings of the bridged biphenyl. The crystal structures of a series of seven-member heterocycle bridged biphenyls were determined by X-ray diffraction.

利用X射线单晶衍射仪确定了系列功能的七元杂环桥联联苯化合物的晶体结构，比较了桥联原子，6，6位取代基及分子间弱氢键对这类桥联联苯扭曲构象的影响。

Results The structure was determined by X-ray single diffraction,being a hexagonal system with space group R-3 and a=1.790 7(1)nm,b=1.790 7(1)nm,c=2.816 2(3)nm,α=90°,β=90°,γ...

不同单元的分子由分子间C—H…O氢键和C—H…π弱相互作用连接在一起，形成三维结构。

Surface modified nano-sized mgnesium hydroxide was prepared by direct precipitation method with magnesium nitrate hexahydrate and sodium hydroxide as raw materials,and sodium fatty alcohol polyoxyethylene ether carboxylate as modifying agent.The optimum dosage of modifying agent was 0.2% of the mass of magnesium hydroxide,which was confirmed by sediment volume experiment.Modified and unmodified samples were characterized by fourier transform infrared spectroscopy,X-ray diffraction,transmission electron microscope,and tap density test.

以六水硝酸镁、氢氧化钠为原料，脂肪醇聚氧乙烯醚羧酸钠为改性剂，采用直接沉淀法一步合成改性纳米氢氧化镁，用沉降体积实验确定改性剂的最佳用量为氢氧化镁质量的0.2%，通过红外光谱、X射线衍射、透射电镜、表观密度对改性前后的样品进行表征。

New methods of measurements of specimen thickness and non-elastically scattering mean free path are proposed based on the electron holograph combining with electron dynamic diffraction.

而且，在电子全息照片和电子动力衍射相结合的基础上我们提出了一种测量电镜样品厚度和样品非弹性散射自由程的新方法。

At last, we have a prospect about the future work and point out that the important works should be paid attention to in the future include improving the diffraction efficiency, improving wavelength resolution and researching more channels volume holograph grating.

最后，对今后的工作做了展望，并指出提高光栅衍射效率、增强光栅对波长的分辨能力、开展多通道波分复用器件等研究应该作为工作重点。

The diffractive optical elements,also called holographical optical elements, are ones based on the theroy of diffraction and non_traditional elements.

衍射光学元件又称为全息光学元件，是建立在衍射原理上的一种非传统光学元件。

Based on Huygens' principle, the basic equations in the ideal medium and the theory of field diffraction, the paper gives theoretical studies of ANC in space, including the mechanism of attenuation of noise, basic characteristics of radiation and the way of energy transfer.

本文从Huygens原理、理想媒质中的基本方程和场衍射理论出发，对空间有源消声的基本理论进行了探讨，分析了次级声源的消声原理、基本辐射特性和能量转换，提出了空间有源消声所减小的声能主要通过次级声源和初级声源本身转换成其它形式的能量的思想，并在实验上进行了验证。

Fresnel thought that the light vibration is one continuous medium- by condition mechanical elastic vibration, he supplemented the huygens' principle by the Young interference principle in 1835, from this has had the Huygens - Fresnel principle which is familiar by people, with this principle can either completely explain the light straight line dissemination,or can discuss the diffraction phenomenon,and it becomes a important principle in the wave optics.

菲涅耳认为光振动是一种连续介质-以态的机械弹性振动，他于1835年以杨氏干涉原理补充了惠更斯原理，由此产生了今天人们所熟知的惠更斯-菲涅耳原理，用这个原理既能圆满地解释光的直线传播，也能讨论衍射现象，成为波动光学中的重要原理。

Five novel molecular tweezers with hydrazide moiety as sidewalls were designed and synthesized,their structures and conformation was fully confirmed by single crystal X-ray diffraction.

合成了五个新型的基于二苯基甘脲和二乙基酯基甘脲的含有两个酰肼化合物边墙的分子钳，利用经典的手段如~3H NMR和~(13)C NYR以及单晶X-ray衍射等对它们进行了结构表征，分析鉴定。

In this paper, with 2-oxo-propionic acid salicyloyl hydrazone as a ligand, one calcium complex, three copper complexes and thirteen rare earth(RE=La, Ce, Pr, Nd, Sm, Eu. Gd, Tb, Dy, Er, Tin, Yb and Lu) complexes have been synthesized. The crystals of four complexes were obtained, and the crystal structures were determined by single crystal X ray diffraction. One of the crystals is calcium complex, the other are binary and trinary complexes of copper.

本文选用2-羰基丙酸水杨酰腙作为配体，在水中分别与钙、铜、稀土(RE=La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Er、Tm、Yb和Lu)的盐反应，共制得了17种未见文献报道的配合物，另外还培养了2-羰基丙酸水杨酰腙、咪唑与铜、钙的二元及三元配合物的四种单晶，对La-Gd的稀土的配合物进行了溶解热的测定，并用Gauss-98软件包对铜的配合物进行了有关量化计算。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。