孔径

Polarimetric Synthetic Aperture Radar measures the frequency, magnitude, absolute and relative phase of targets' backscattering signals in imaging scene for any possible combination of transmit and receive antennas. The polarization synthesis technique on one hand has greatly increased the acquired polarization information, on the other hand increased the difficulty of system design and signal processing.

中文摘要极化合成孔径雷达的回波信号可以提供不同收发极化状态组合下成像场景内目标散射波的幅度、绝对和相对相位、频率等信息，极化合成技术的出现使获取的信息量成倍增加，信息量增加的同时系统设计和信号处理的复杂度增加，因此极化合成孔径雷达相关技术的研究成为微波遥感领域的热点。

ABSTRACT In this dissertation a number of theoretical and technical problems to be faced in applying synthetic aperture techniques to remote sensing of the earth are resolved, researching on synthetic aperture microwave radiometric imaging technology against the background of developing satellite microwave radiometric imaging system.

全文主要以星载微波辐射成像系统的研制为背景，对合成孔径微辐射成像技术进行了研究和探索，解决了将合成孔径技术移植到地球遥感领域存在的一些具。。。

This utility model disclosed a dust removal equipment, environmental protection, their characteristics is that, including filters, dust collection equipment and negative pressure ventilation machines, referred to the vertical filter settings are arranged in descending sequence multi-aperture filter, its Set large aperture filters connected at one end of inlet pipe, set a small aperture at one end of filters connected through the vacuum exhaust fan out of the wind pipe, dust collection equipment installed in the bottom of each layer filters.

本实用新型公开了一种环保除尘设备，其特征在于，包括过滤器、集尘装置和负压抽风机，所述过滤器内垂直设置有多层孔径依次从大到小排列的过滤网，其设置有大孔径过滤网的一端连接进风管，设置有小孔径过滤网的一端通过负压抽风机连接出风管，集尘装置设置在每层过滤网的下端。

In this paper,the power coupling efficiency of semiconductor laser passing through a collimating system is discussed.

在长距离无线光通信中，接收点光功率密度与光束发散角平方呈反比关系，为了获得小的发散角和大的功率耦合效率，要求准直系统有较大的数值孔径，但数值孔径过大会增加像差，因此合理设计功率耦合效率与准直系统的数值孔径就非常重要。

When one element of an N-element array is aberrated, the most sensitive aberration is Piston error, and then the sensitive aberrations are element defocus, tilt, spherical aberration, coma and astigmatism. As for four aperture system, the influence of Piston error is 2 times larger than that of defocus, and 4 times larger than that of astigmatism.

在合成孔径成像系统单个子孔径存在像差的情况下，Piston误差对系统的影响最大，其次是离焦误差、倾斜误差、球差、彗差和像散，对于四孔径系统，Piston误差对系统的影响几乎是离焦误差的2倍，像散的4倍。

Comparison of end wall heat transfer and pressure drop characteristics was made between two kinds of rectangular clapboards and two kinds of waved clapboard in the turbine blade trailing edge complex passages.

主要讨论了在通道其它结构均相同的条件下分别采用4种不同结构的隔板（2种孔径的矩形隔板与2种孔径的波形隔板），研究隔板中孔径大小对通道换热和流阻的影响。

The new algorithm purposed in this article manages this part of phase error by splitting the SAR data to several sub-apertures in range-Doppler domain and compensates the spatially variant phase error respectively.

该文提出的子孔径算法通过在距离-多普勒域将SAR数据分为若干子孔径，每个子孔径数据进行单独的相位误差补偿，从而实现了空变相位误差的补偿。

Screws, bolts, or nuts without washers must be loaded against a test plate with a minimum diameter clearance hole equal to the nominal thread size plus 0.50mm for fasteners M6 (1/4 inch) and smaller, and plus 1.0mm for larger diameters.

无垫圈的螺钉、螺栓、或螺母应被装夹到具有较小孔径的通孔的试验圆板上进行试验，对于≤M6 (1/4 inch)的紧固件，试验圆板的孔径为公称螺纹直径加上0.50mm，对于＞M6 (1/4 inch)的紧固件，试验圆板的孔径为公称螺纹直径加上1.0mm 。

These are of potential interest in photonics and fiber-optics application.

在很近场区，二元环形孔径的在轴光强分布对孔径结构比较敏感，这些特性使这种孔径在光子学和光纤光学的应用方面具有潜在的价值。

These results demonstrated that the sectional structure of the nozzle's orifice would not significantly affect the morphology and the size of the generated microspheres at least for the present system. RESS was also performed by nozzle B at the extraction temperature and pressure of 388K and 30.0MPa and pre-expansion temperature of 453K, and agglomerated microspheres with mean diameter of 0.8μm were obtained.

以α-Al〓O〓微滤膜为基膜的SCSI过程实验结果定性地验证了上述数学模型的可靠性，经过SCSI、水解及烧结过程后，陶瓷膜的孔径改变情况由气体渗透和泡压法表征，结果表明当膜面性质有利于均相成核时，陶瓷膜流动平均孔径减小；相反平均孔径增大，这与过程模拟结果是一致的。

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