查询词典 density

This paper presents a simple physical model of change of mass density for calculating the diffraction intensity of multilayer, which is proved by the experiments of the small angle X-ray diffraction.

提出了这种膜系内密度变化的简单物理模型，通过理论衍射强度计算和小角X衍射实验证明这种模型是合理的。

This distance relates directly to wavelength and depends on the grating groove density and angle of incidence.

这个距离直接与波长有关，并取决于光栅线密度及入射角。

The thesis finds out the relations of all kinds of factors that affect the warhead kill power and brings forward a formula of projection angle that is quite consistent with the experimental results in fragment density.

本文正是针对这一要求，以35mm口径榴弹为对象，对战斗部头部的定向杀伤进行了研究，找出了影响杀伤标准的各种因素的内在联系，并根据已有理论提出了一抛掷角公式，经过与试验双较，基本吻合。

In this thesis,based on the DFT+NEGF first-principles method,we construct a lead-molecule-lead sandwich system with single benzene-based molecule to investigate the relationship between the structure and properties of the molecular devices and the factors that influence properties of the molecular devices.Our computational investigations on these molecular devices are primarily concentrated on the effect of contact geometry between molecules and electrodes,the effect of side groups,the effect of different torsion angle between two phenyl rings and the effect of external electric field.This thesis consists of five chapters:In Chapter one,we mainly introduce the research background and development of the molecular electronics,including the experimental fabrication of molecular electronic components and theoretical simulation methods.Afterwards we discuss the questions that need to be solved in this area.Finally,the main contents of this thesis are listed.In Chapter two,we introduce the theoretical methods used in this thesis, including the main first-principles calculation methods,i.e.,the Density-Functionmethod and nonequilibrium Green\'s function.

本论文拟采用密度泛函理论和非平衡格林函数相结合的第一性原理计算方法，选取苯基小分子作为研究对象，构建了金属电极/有机小分子/金属电极三明治结构体系，系统地研究了苯基分子器件结构的改变与分子电输运性质之间的关系以及影响分子器件电输运性质的相关因素，其中重点研究了分子与电极间可能的接触结构改变、官能团、分子间的扭转角以及外电场对苯基分子电输运性质的影响，本论文主要包括以下五个章节的内容：第一章为综述部分，主要介绍了分子电子学产生的背景、分子器件的研究意义、当前研究分子器件的实验和主要理论方法，以及目前在研究分子器件中存在的一些问题，最后给出了本论文的主要研究内容和技术路线。

Hardness and temperature, current density, chromium content of sulfuric acid anhydride and are closely related.

铬层软度与温度、电流密度、铬酐及硫酸的含量都有紧密亲密的干系。

Presently research mainly concentrates on the tree ring in the annual ring width, the annual ring density, etc.

在以往的研究中，对树木年轮的研究主要集中在对年轮宽度、年轮密度等几个指标的量测与分析上。

There exists a close relation between growth characteristics and wood properties of the provenance. The height and breast height diameter growth of the provenance had a positive correlation with tracheid diameter and annual ring width, and a negative correlation with tracheid wall thickness and wood density.

种源生长与材质性状间存在一定的相关关系，如种源的高径生长与管胞直径和年轮宽之间存在正相关，而与管胞壁厚和木材密度之间却存在一定程度的负相关。

Size and density of nanodot arrays can be controlled by various anodic conditions.

奈米点的大小和密度都可以透过控制施加电压的改变来获得控制。

Effect of parameters including current density, temperature, acidity of anolyte and catholyte, concentration of nickel and NaCl in anolyte on preparation of nickel chloride solution is investigated.

研究了以镍基废合金板为原料，电流密度、温度、阳极液和阴极液的酸度、阳极液中NaCl和Ni(上标 2+)的浓度对电解制备氯化镍溶液的影响。

Current density, anolyte acid and concentration of SO42 in anolyte are notable factors influencing the current efficiency, oxidation rate and cell potential.

通过均匀设计的电解条件试验得出：电流密度、阳极液酸度和阳极液硫酸根浓度为影响电流效率、氧化率和槽电压的显著因素。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了