查询词典 angular aperture

Because COTY colour picture tubes adopt XL lens as main lens, three electron beams are focused by a larger common lens in addition to three circle aperture lenses.

RCA公司在八十年代研制出COTY彩色显象管，它采用XL透镜做主聚焦透镜，其中除了三个单独的小透镜起聚焦作用外，三个电子束还受到一个公用大透镜的作用，因此透镜像差得以降低。

For spaceborne Synthetic Aperture Radar, Dopplcr property is one of the most important factors for azimuth performance. In this paper, the elliptic orbit is applied.

摘要在星载合成孔径雷达中，多普勒特性是决定雷达方位向性能的主要因素，对它的正确估计将影响到雷达的性能和最后成像的精度。

Careful attention should be paid to every steps of enterostomy operation in order to prevent the complications of stoma. These include the incision of skin, hypodermis, fascia and peritoneum, fixation of bowel around the stoma aperture, the size and shape of stoma, and the supportive tube in loop ostomy.

要求术者用心做好造口手术的每个细节，包括造口皮肤切口、皮下、筋膜、腹膜等的切开和造口肠管之间的缝合固定，造口的大小和形状，以及襻式造口所用的支撑管，以达到预防造口并发症的目的。

The main work can be summed up as follows: Firstly, we studied the thermal-field properties of VCSELs, and analyzed the influences of current spreading, material parameters and operating conditions on the temperature distributions. Secondly, we began with the electrode voltage and calculated the equipotential s distributions, compared the distributions of voltages and current densities in different depths of VCSELs, and then studied the influences of the oxide-confining region with different position or thickness, and the different sizes of the gain-guided aperture and emitting window on the distributions of the injected current density, carrier concentration and temperature in the active region. Thirdly, we realized the coupling of electricity, optical and thermal-fields, worked out the threshold voltage, calculated the distributions of the injected current density, carrier concentration and temperature under different offset voltages, and analyzed the impacts of temperature profile and carrier density on the refractive index, Fermi levels and optical-field. Finally, we gave the equipotential line distributions with considering N-DBR and double oxidized-confining regions, and analyzed theinfluences of N-DBR and double oxide-confining regions on the distributions of the current density, carrier concentration, temperature and optical-field.

具体工作可以概括如下：首先，研究了VCSEL的热场特性，分析了电流扩展，材料参数和工作条件对于温度分布的影响；其次，从电极电压入手，计算出激光器中的等势线分布，并对不同深度处的电压和电流分布进行比较，研究了高阻区的不同位置和不同厚度、限制层和出射窗口半径的大小对电流密度、载流子浓度和温度分布的影响；再次，实现了电、光、热耦合，求出了阈值电压，计算了不同偏置电压下的电流密度分布、载流子浓度分布和热场分布，分析了温度和载流子浓度变化对折射率、费米能级和光场的影响；最后，给出了考虑N-DBR和双氧化限制层时激光器中的等势线分布，分析了N-DBR和双氧化限制层对VCSEL电流密度、载流子浓度、温度和光场分布的影响。

Principal products of our company: screw and nut for furniture, gharry screw, T type screw, loose joint bolt, flower basket bolt, expansion bolt, closing ring for bearing and aperture, Shanghai rivet, copper, iron and aluminum rivet, stainless steel standard pieces, flat key, pin key, automatic drilling nail, 12.9 level alloy steel hexagonal socket, tightening screw, countersunk head hexagonal socket screw, 10.9 steel structure bolt, machine bolt, firmware of DIN, ANSI, BS and JIS.

本公司生产和销售家具螺丝螺母、马车螺丝、T型螺丝、活接螺栓、花篮螺栓、膨胀螺栓、轴用孔用挡圈、上海拉铆钉、铜铁铝铆钉、不锈钢标准件、平键销键、台湾合资自攻自钻钉、12.9级合金钢的内六角、紧定螺丝、沉头内六角螺丝、10.9级钢结构螺栓、机螺钉、各种德标、美标、英标、日标紧固件。

His first camera had an aperture of about 360mm or 14.5 in diameter, and a focal ratio of f/1.75. It is now housed in a museum at the Hamburg Observatory .

他的第一个相机的光圈约三百六十零毫米或14.5 ，直径，和一个焦点的比例f/1.75 ，这是现在住在一个博物馆在汉堡天文台。

F f-Number: A symbol that expresses the relative aperture of a lens.

f-制光圈∶一个表示镜头的相对光圈的单位。

F-number: The figures marked on the lens collar to indicate the size of the lens aperture in relation to its focal length.

光圈值：刻划在镜头上用来表示镜头孔径与焦距关系的比值。

Although factors that affect the quality of an image captured at high speed include scene luminance, aperture size (f-number, f/#), shutter speed, and field of view, a simple calculation can determine the approximate shutter speed needed for such an application.

尽管影响高速捕捉图像质量的因素包括场景的亮度、镜头大小、快门速度和视野，不过对于这样的应用场合可以很简单就计算出大致所需的快门速度。

Meter the scene, select an f-stop, set the autoflash aperture to the same f-stop, and shoot.

根据场景选择合适的光圈，将闪光灯的光圈设置为同样大小。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。