查询词典 diffraction instrument

X-ray diffraction is one of the most common and efficient ways to measure a superlattice structure. This dissertation displays the detail results for characterization of Ge〓Si〓/Si superlattices by x-ray diffraction (including x-ray small angle diffraction and double crystal diffraction). It was found, when the growth temperature is lower, the intensities of xray small angle diffraction peaks are modulated by a periodical function, which indicates that both sets of interfaces of the superlattice is highly flat; when the growth temperature is higher, the diffraction peak intensities are simply decay with the increase of diffraction vector, which indicates that one set of interfaces is highly flat but another is not; when the growth temperature is very high, the diffraction peaks are reduced more rapidly, which indicates that both sets of interfaces are not ideal.

本文详细介绍了用X-射线衍射（包括X-射线小角衍射和双晶衍射）方法对Ge〓Si〓/Si超晶格结构特性测试的结果，尤其是发现，当Ge〓Si〓/Si超晶格的生长温度较低时，X-射线小角衍射谱峰的强度随着衍射波矢的增加而周期性调制，表明超晶格的两套界面都十分平整；当生长温度较高时，Ge〓Si〓Si超晶格的X-射线小角衍射谱峰的强度随着衍射波矢呈简单的衰减变化，对应于超晶格内有一套界面不平整的情况；当生长温度进一步提高时，X-射线小角衍射峰明显减少，表明超晶格内两套界面都不理想。

The camera length of electron diffraction in transmisson electron microscopy is one of the main technical parameters in designing electron microscope and the electron diffraction analysis to microcrystal sample. According to Bragg law, the formula of calculating TEM electron diffraction camera length is derived from the research on the ray path of electron diffraction images in TEM and the comparison on electron diffraction with ordinary electronic diffractometer. The difference of physical significance of electron diffraction camera length between TEM and ordinary electronic diffractometer is discussed.

透射式电子显微镜(Transmisson Electron Microcopy， TEM)中的电子衍射相机长度，是电子显微镜设计和对微晶体样品进行电子衍射分析的主要技术参数之一依据布拉格定律，经对TEM中电子衍射成像光路的探讨与研究，并通过TEM与普通电子衍射仪的电子衍射的对比分析，导出了TEM电子衍射相机长度的精确计算公式，阐述了TEM和普通电子衍射仪的电子衍射相机长度所表征的物理意义的区别。

Management content: The company product mainly covers the microscope, the tool maker's microscope, the projecting apparatus, the sclerometer, the thickness gauge, the magnifying glass, the balance, the measuring instrument quantity meter, the mapping equipment, the metering equipment, to test the instrument, the electrochemistry instrument, the physical instrument, the analytic instrument, the biochemistry instrument, the non-destructive inspection, the medical instrument, the processing machinery and so on altogether 28 broad headings, 170 minor sort large-scale specialized precision instrument measuring appliance sale enterprises.

经营内容：公司产品主要涵盖显微镜、工具显微镜、投影仪、硬度计、测厚仪、放大镜、天平、量具量仪、测绘仪器、测量仪器、实验仪器、电化学仪器、物理仪器、分析仪器、生化仪器、无损检测、医疗器械、加工机械等共28大类，170余个小类的大型专业精密仪器仪表价格企业。

In plotting scene, the invention connects fiber-optic gyro(1) with full station instrument telescope(3) by adaptor(2), and make optical fibre gyro can follow full station instrument telescope simultaneously do 180 degree turning reel full station instrument cross shaft, respectively on two horizontal positions of east and west direction of gyro axis that differ by 180 degree; each horizontal position process 2 x 2 position gyro data acquisition on full station instrument perpendicular tray that differ by 180 degree; using formula to count out full station instrument collimation axis true azimuth, survey station meridian convergence angle, then can obtain full station instrument collimation axis grid azimuth, realize full station instrument orient.

基于光纤陀螺的全站仪组合定向方法是一种应用于测绘工作的基于光纤陀螺的全站仪组合定向方法，该方法在测绘现场，把光纤陀螺(1)通过连接装置(2)与全站仪望远镜(3)固连，使光纤陀螺(1)可随全站仪望远镜(3)绕全站仪横轴(4)同步做180度转动，分别在陀螺轴东西向相差180度两个水平位置，每个水平位置在全站仪竖盘相差180度的两个竖直位置进行2×2位置陀螺数据采集；利用公式算得全站仪视准轴真方位角、测站子午线收敛角，即可进一步获得全站仪视准轴坐标方位角，实现全站仪定向。

The Corporation product covering microscope, the tool maker's microscope, the projecting apparatus, the sclerometer, the thickness gauge, the magnifying glass, the balance, the measuring instrument quantity meter, the mapping equipment, the metering equipment, test the instrument, the electrochemistry instrument, the physical instrument, the analytic instrument, the biochemistry instrument, the non-destructive inspection, the medical instrument, to process the machinery altogether 18 broad headings, 170 minor sort.

公司产品涵盖显微镜、工具显微镜、投影仪、硬度计、测厚仪、放大镜、天平、量具量仪、测绘仪器、测量仪器、实验仪器、电化学仪器、物理仪器、分析仪器、生化仪器、无损检测、医疗器械、加工机械共18大类，170余个小类。

According to the author statistics shows that nearly 2000 poems about string instrument of Tang Dynasty in "" The Whole Poetry of Tang Dynasty "", it had reflected all respects of artistic development of string instrument of Tang Dynasty, embody a poet in the Tang Dynasty from describing that kinds of spiritual idea making the poet profound and expresse in the poem of the string instrument in Tang Dynasty, the classical, outstanding poems of the string instrument of Tang Dynasty,the description have worthful historical data value and aesthstic value, it is the rare important wealth on Chinese string instrument art and literature development history, it promote the development of string instrument art after Tang Dynasty, these 2000 poems of string instrument describe the study of Tang Dynasty and give us a lot of artistic value of written historical materials in Tang Dynasty.

据笔者统计：在《全唐诗》中约有2000多首描写唐代拨弦乐器的诗作，在这些诗作中集中体现了唐代拨弦乐器艺术发展的各个方面，从描写唐代拨弦乐器的诗作中折射出唐代诗人抒发的那种令人深邃的精神理念，这些经典、优秀的描写唐代拨弦乐器的诗作具有宝贵的史料价值和美学价值，是中国拨弦乐器艺术与文学发展史上不可多得的重要财富，对唐代以后拨弦乐器艺术的发展，产生了积极影响。这2000多首描写唐代拨弦乐器的诗作，是研究唐代拨弦乐器艺术价值的珍贵文字资料。

Based on the relations of the diffraction field and the surface wave, which conclude diffraction factor and interference factor, some relations were conformed such as: the diffraction fringes spatial distribution versus surface wavelength, the fringes half angular width versus the numbers of surface wave covered by laser spots and incidence angle, diffraction intensity versus surface wave amplitude.

通过对衍射因子和干涉因子的分析，得到衍射条纹空间分布与表面波波长的关系、条纹的半角宽度与入射激光光斑覆盖表面波的个数和入射方向的关系、衍射光强度与表面波振幅的关系，并解释了条纹缺级现象。

The principle of the two dimensional acoustooptic Q switch is presented,the formulas of the diffraction efficiency and diffraction loss of the AO Q switch with normal Bragg diffraction is derived,the relationship between One dimensional and Two dimensional Bragg diffraction is analyzed.

描述了两维声光Q开关的基本原理，详细推导出正常布喇格衍射的两维声光Q开关衍射效率和衍射损耗的表达式，分析了两维布喇格衍射和一维布喇格衍射之间的关系，并给出了在驱动功率40W、光束直径5mm、光波长1。

The diffraction theory of Kirchhoff is applied to the four-pinhole aperture diffraction screens, the intensity, the zero-contour of the real and imaginary parts of complex amplitude and the phase distribution in deep Fresnel diffraction region are simulated, and it is found that the bright spots in interference field show central symmetry distribution. When the observation plane close to the diffraction screen, the zero-value points of light intensity can form line segment, on which the eccentricities of the light intensity isoline are close or equal to 1, the intensity changes very fast on both sides of the zero-line of light intensity.

利用基尔霍夫衍射理论计算了四圆孔径衍射屏在菲涅尔深区形成的的干涉光场的强度、零值线和相位的分布，发现干涉光场亮斑关于中心呈对称分布，在距离衍射屏较近的观察面上，光强值为的零点组成光强零值线段，该线段上光强等值线的离心率都接近或等于1，其两侧的光强值变化非常剧烈。

It is showed that in the X-ray diffraction patterns of the interlayer solid solution Ti3Si0.9Al0.3C1.93 and Ti3Si0.8Al0.4C1.93 bulk samples,which were in-situ reactively synthesized by hot-pressing the elemental Ti,Si,Al and C mixed powders,the diffraction peaks of [00L] crystal planes are very weak,there is only a small diffraction peak belonging to the [008],and the diffraction peaks belonging...

结果发现，用热压Ti、Si、Al和C混合粉末原位反应合成的Ti3Si0.9Al0.3C1.93和Ti3Si0.8Al0.4C1.93层间固溶体块体样品的X射线衍射谱中[00L]晶面的衍射峰极其微弱，只有[008]面有一个小的衍射峰，[002]、[004]和[006]面几乎没有衍射峰存在，而该块体样品的粉末的X射线衍射谱中所有[00L]晶面的衍射峰均存在。

If this is not specified, then it is defaulted to 25

如果这是没有指定，则默认为25

Cott invited his mother over for dinner.

COTT邀请母亲来他的房子晚餐。