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At present the cell array lens is usually cylinder or hemispheroid whose fill-factor (the ratio of light area and total area ) can achieve about 90.7%, so we need higher fill-factor arrays sometimes such as in the compound eye simulation optical system.

由于传统的圆形孔径透镜阵列填充系数较小,而在模拟复眼光学系统中需要高填充系数的透镜阵列。

Design and realization of a real-time high-resolution SAR data processing system is proposed.

摘要该文给出了一种高分辨率合成孔径雷达实时数据处理系统的方案设计与实现。

A reasonable mathematical model and a effective stitching algorithm were established based on homogeneous coordinates transformation, least square method and Zernike polynomial fitting.

介绍了子孔径拼接干涉检测非球面的理论和方法,分析了其基本原理,基于齐次坐标变换、最小二乘法和Zernike多项式拟合建立了一种合理的拼接算法和数学模型。

We can provide customers with honeycombed boards with various areas densities, honeycomb-sizes, and paper materials.

根据用户需要制作各种克重和蜂窝孔径密度及材质的蜂窝纸芯和蜂窝纸板!

The anatomical study deepens the knowledge of G-type conducting cells: 1 It proves the theory of two depositional process for secondary wall (Bierhorst, 1960): the discontinuous cellulose layer is laid down before the continuous lignified layer; the former layer is prone to be broken down, while the latter is highly decay-resistant; 2 It suggests that the cellulose primary and secondary walls of tracheids are not perforated. Instead of longitudinal pits (Li, 1992), the lignified tracheid secondary wall of Hsüa possesses irregular simple perforations; 3 In Hsüa reflexa and Huia gracilis, the perforation casts may represent the thickness of lignified secondary wall; 4 The wall structure of G-type tracheid is diversified. At the genus level, the secondary wall structure differs in the distribution, internal shape and structure of the perforations; 5 Perforations of some G-type tracheids combine the characters of S-type tracheids in their distribution, density and diameter.

解剖学的研究加深了对G-型输水管胞的认识 1)验证了管胞次生壁分两个阶段形成的理论(Bierhorst,1960),即先后形成不连续的纤维质层和连续的木质化层,前者易被分解,后者抗侵蚀性强;2)证明管胞纤维质的初生壁和次生壁不具穿孔,Hsüa管胞的木质化次生壁具有不规则的简单穿孔,而不是纵列的纹孔(Li,1992);3)Hsüa reflexa和Huia gracilis的穿孔铸体可代表木质化次生壁的厚度;4)G-型管胞壁层结构具多样性,植物属一级的分异主要表现在次生壁穿孔的分布、孔腔形状和结构的不同;5)某些G-型管胞的穿孔在其分布、密度和孔径方面可兼有S-型管胞的特征。

The prescription of PCHA, which suit to the growth of normal bone, was selected according to the results of porosity, diameter and connecting pore examined by scanning electron microscope, dyeing of pore and experiment impressed with hydrargyrum.

PCHA的制备:预实验对13种制孔剂初筛,选出适合CHA原位固化成孔的发泡剂,并与原制备的CHA按不同重量配比,经扫描电镜、孔隙浸染以及压汞实验等方法,筛选出孔隙率、孔径分布和孔之间连通性适合骨生长的PCHA配方。

In the case of the side-glance angle of beam is zero or small,an algorithm has been developed to determine the latitude and longitude of an arbitrary pixel in an air-borne strip mode SAR image without consideration of the hypsography.

在不考虑地形起伏的情况下,从机载合成孔径雷达数据采集几何关系和成像原理的角度,针对正侧视和小斜视情况提出了计算机载SAR图像像素点经纬度的一种准确而实用的方法,给出了从雷达图像上的像素点计算其经纬度的详细过程,并结合某实际机载SAR成像参数对影响定位精度的因素包括高度测量误差,航向角、俯仰角、横滚角误差和多普勒中心、多普勒调频率误差进行了详细的分析。

The method transfers the observed data from space domain to 2-D space-time domain by exploiting the cross-correlation of the array outputs,and a large amount of virtual elements are generated through space-time processing.Therefore the constraint over the array configuration and the element identity can be significantly weakened,which means the matching subarray is no longer needed and the advantage of the traditional DOA matrix method,such as automatical parameter alignment and no need of 2-D search,is still available.

该方法在保持原DOA矩阵方法无需二维谱峰搜索和参数配对等优点的基础上,利用阵元输出之间的互相关关系将空域的阵列观测数据变换到时空域,通过空时二维处理在时空域中衍生出大量虚拟阵元,从而大大减弱了传统方法中对阵列结构、排布方式和阵元一致性的约束,不需要匹配子阵,无冗余阵元与孔径损失,并适用于阵元排列不规则的阵列。

The reflection effect of the spherical surface of a hemisphere solid immersion lens has been investigated using the vectorial diffraction theory for high numerical aperture systems.

应用高数值孔径系统的矢量衍射理论研究了半球形固体浸没透镜球面表面的反射对SIL系统透射场的影响。

In solid immersion lens microscopy systems with high numerical aperture, there always exists the aberration produced by Fresnel effects at the interface between SIL and the sample.

在高数值孔径的固体浸没透镜显微系统中,固体浸没透镜界面与样品之间的菲涅耳效应将产生象差,这一象差可能导致样品成像质量的下降。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力