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We have calculated the electronic structure and optical properties of zinc blende structure ZnSe under different high pressure by means of plane wave pseudo-potential methodwith generalized gradient approximationin this paper.The total energy,density of state,energy band structure,and optical absorption and reflection properties under high pressure are calculated.Furthermore,we analyzed the change of electron structure,band structure and optical properties under high pressure using the results of experiment and theory

运用密度泛函理论体系下的平面波赝势和广义梯度近似方法,利用第一性原理计算了不同的压强下ZnSe晶体闪锌矿结构,得到了它的平衡晶格常数、总能量、电子态密度分布、能带结构、光反射与吸收系数等性质,具体讨论了高压下ZnSe的电子结构,并且结合实验结果定性地分析了高压下的光学性质。

Based on 45-month NOAA satellite data of radiation, including the absorbed sun radiation, the albedo and outgoing long wave radiation, as well as the formula for the radiation budget, the features are revealed for the zonally and monthly averaged radiation budget in the earth-atmospheric system.

利用温斯顿编制的美国NOAA卫星第一批 45个月辐射观测资料分析图,包括吸收太阳辐射、反射率及射出长波辐射,而地—气系统辐射平衡是用公式计算的。

PubMed abstract: To examine the relationship between synaptic plasticity and learning and memory as directly as possible, we have developed a new simplified preparation for studying the siphon-withdrawal reflex of Aplysia in which it is relatively easy to record synaptic connections between individual identified neurons during simple forms of learning.

PubMed摘要:为了尽量直接地研究突触可塑性与学习和记忆的联系,我们做了新的一个简化制备,目的是研究海兔缩虹吸反射,其中较容易在学习的简单形式中,记录个体确定之神经元的突触联系。

Combined with optics, calorifics, electrics and acoustics, PA theory and PA application need deeply studied.

光声光谱的理论和应用,还需深入研究和开拓发展。光声光谱法适用性广,对于传统吸收光谱难以测定的不透明、高反射、高散射样品,也可以方便地测定。

Result indicates spherical catadioptric panorama imaging system can better realize panorama observation ,and comparing with other kinds of catadioptric facial ,spherical catadiop2tric panorama imaging system has advantages such as small scene distortion ,low2cost and simple design ,etc.

结果表明:基于球面的折反射全景成像系统可较好地实现全景观测,同其他几种折反射面相比,具有场景畸变小、造价低、设计制作简单等优点。

When end surface is neglected, the reflective energy will return to the filament efficiently if the filament is at the centre axis of the columniform lamp shell. 3 Compared with the straight tungsten filament that has a smooth surface, the helical one obtains higher absorbance which can achieve 0.6~0.7 under the actual screw pitch measurement.

当灯的管径为10 mm,而灯丝外径为1.5 mm时,节能可达12%到13%。2)对圆柱形灯外壳,在不考虑端面影响时,光源的灯丝若处于外壳的中心轴上,则反射的能量会有效地返回灯丝。3)螺旋结构的灯丝比表面光滑的直钨丝有更高的吸收率,灯丝绕成螺旋后在现行的螺距尺寸下吸收率能达到

To resolve those problems, the nature of safety is expatiated by comparing the differences between safety and reliability, security, which would facilitate us to design some novel safety mechanisms. Based on multilevel safeguard mechanisms, the safety technologies of distributed mission real time system is deeply, systematically researched in this dissertation, some main works and contributiveness including:1 To improve safety of complex mission critical real time system by dividing and ruling way, the whole system usually is divided into few small and simple subsystems with different criticality.

并以多级防危机制为核心,对分布式任务关键实时系统的防危技术进行了系统、深入地理论研究和实验,主要的贡献与创新之处包括:在分析现有应用级防危机制不足之处的基础上,基于多级关键度划分的思想,提出了集成式的多级防危机制,其中重点研究了支持该机制的多级关键度访问控制规则,其目的是防止低关键度子系统中的设计缺陷破坏高关键度子系统的防危性,同时研究了基于反射技术的规则执行。

Based on the analysis of sequence stratigraphy and seismic stratigraphy of carbonate platforms, especially to the ones in Dongsha and Xisha, this dissertation has identified, for the first time, three major and several minor drowning events of the platforms since Tertiary. Drowning events in the four carbonate platforms, especially in Dongsha Platform, coincide with major global eustatic cycles raised by B.

在经过高技术处理的地震剖面上,淹没层序的特征是顶部同相轴呈光滑的双轨连续强反射,特殊处理后表现出高波阻抗、高密度和强瞬时振幅等特征,还表现为高的速度梯度值和高的剩余速度梯度值,甚至在局部区域出现本层层速度比下部地层层速度高的现象。

At the entrance of cooking chamber, one can rotate around the mixer, because the metal mixer is wind fanlike spin, after each direction of microwave is reflected, so can the microwave energy evenly distributed in cooking chamber.

在烹调腔的进口处附近,有一个可旋转的搅拌器,因为搅拌器是风扇状的金属,旋转起来以后对微波具有各个方向的反射,所以能够把微波能量均匀地分布在烹调腔内。

We establish measurement twice on micro shift for testing superprism effect. And the "thin film gratings" measurement, which we adopt finally, has critically tunable monochroic system, collimated system and exact system for spot detection, realizing detect the micrometer-level shift of reflective and transmissive spots with high sensitivity and precision, and is useful for studies on dispersive device with high resolution.

为了更好地对超棱镜效应进行测试,本文先后两次搭建了微位移测试平台,尤其是最后采用的&光学薄膜光栅&超色散测试系统,采用精密可调的单色系统、小光束准直系统以及精密光斑位置检测系统,实现高灵敏度、高精度的反射光斑及透射光斑的位置检测,为超分辨色散器件的研究奠定了基础。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。