后成的

This technique uses a spiral phase plate with a small central aperture placed on the Fourier plane of an imaging system. If the spiral phase filter is rotated by a certain angle around its central axis,a phase shift between the zero-order spatial frequency component and the remaining of the object is produced,and the magnitude of this phase Shift is proportional to the rotation angle. Using this property,we can record a sequence of intensity distribution of the output beams corresponding to different rotation angles,and then digitally reconstruct the objects by using a phase-shifting algorithm. Both the theoretical analysis and simulation experiment results demonstrate the feasibility of this approach.

在成像系统的频谱面上放置中心带有一通光孔径的螺旋相位板，在输出面上记录输入物体经螺旋相位滤波后的输出像；将螺旋相位滤波器绕轴旋转一定角度，通过中心光孔的零频成份与其他高频成份间会产生与旋转角度成正比的相移；利用这一特点，通过记录多幅对应不同旋转角度的输出光场强度分布图，然后再用一定的相移算法实现被记录物体相位分布的数字再现。

Fluxgate sensors have the second harmonic voltage amplitude with the magnetic field strength is proportional to the adoption of second harmonic filter through phase-sensitive detector rectifier, to achieve full-wave rectifier, low-pass filter in through the phase-sensitive detector after the second harmonic into a smooth DC signal, on the one hand to the back of the circuit, on the one hand, the magnetic flux through the door to feedback regulation, the opposite magnetic field generated with the measured magnetic field, so that the work has always been zero fluxgate magnetic field, thus ensuring the most high-precision fluxgate.

磁通门传感器产生的二次谐波电压幅值与磁场强度成正比，二次谐波通过通过滤波器再通过相敏检波器整流，实现全波整流，在通过低通滤波器将相敏检波后的二次谐波转化成平滑的直流信号，一方面送到后面的电路进行，一方面通过反馈调节送到磁通门中，产生与被测磁场相反的磁场，使磁通门始终工作零磁场下，从而保证磁通门的最高精度。关键词：磁通门磁力仪，相敏检波器，磁场

The amplifier itself consists of a cascade of RC neutralized common-emitter stages each with primary tuned interstage transformer.

放大器由中和了的共发射极级链接而成，级间用初级调谐的变压器耦合，叙述分三个部分：第一部分将中和了的共发射极电路用近似等效电路表示，第二部分分析级间网络，将晶体管放大器的功率增益表示成预给的频率函数后，就能导出各级间网络的谐振频率和Q值等，从而求出线路元件的数值。

On a recent morning,Zoo Atlanta's bamboo hunters trooped through a wooded lot carrying a saw,a lopper and twine. They sawed,chopped and bundled the green stalks with ease and efficiency,filling the back of their truck in a couple of hours.

最近一个早上，亚特兰大动物园的采竹队带着锯子、长剪和麻绳深入到一片茂盛的竹林中，他们又锯又砍，并把采伐的绿色竹茎扎成捆，几个小时后就装满了卡车的后车箱。

By integrating the multi-discipline methods of petroleum geochemistry, sedimentology, hydrogeology, petroleum geology and experimental geochemistry, the thesis has carried out experiments of microcline dissolution in solutions with organic acids, crude oil, brines with high total dissolved solids , and has dealt with Al distribution between the crude oil and the brines after the experiments.

综合利用油气地球化学、沉积学、水文地质学、石油地质学、实验地球化学多学科交叉方法，进行了长石在有机酸、原油、高矿化度卤水中的溶解实验，研究了溶解后元素Al在油水相中的分配；通过详细研究塔里木盆地塔中地区、和田河气田、库车坳陷和塔北隆起北部油气藏流体的化学、同位素组成，观察岩石薄片、测试流体包裹体成分和均一化温度、全岩和自生矿物同位素组成，并结合油气运移和成藏史的研究成果，分析了三地区流体的成因、流动，并探讨了烃类侵位对成岩作用的影响、微生物和热化学的硫酸盐还原作用。

Histological structures of bursas of Fabricius were observed at the different developmental stages from chicken embryoes to chickens. The results were as follows. The bursa of Fabricius began to develop on the 13th day of post-hatching and its cell aggregated into the nodosity clique underneath the epithelium mucosae. On the 15th day of post-hatching, those cell cliques were surrounded by the flat epithelium and formed the basic structure of folliculus lymphaticus. The number of lymphocytes in the folliculus lymphaticus increased gradually, and the medulla and cortex of a majority of folliculus were not discriminated obviously. Until on the 7th day for chickens, the medulla and cortex of folliculus formed completely and the number of folliculus increased significantly. From 21 to 35 days old, the folliculus lymphaticus transformed from polygon into rectangle. Mucosa epithelial cells increased gradually and their cytoblasts arranged compactly into aline in the basilar part on the 35th day.

本研究观察了从鸡胚到出壳后的不同生长发育阶段法氏囊的组织结构，结果表明：胚胎13日龄时，法氏囊开始发育，粘膜上皮下形成结节状细胞集团；胚胎15日龄，聚集的细胞集团形成初始的淋巴滤泡；胚胎18日龄到出壳后1日龄，滤泡内淋巴细胞数量增多，多数滤泡髓质和皮质界限仍不明显；7日龄雏鸡法氏囊髓质皮质分界清晰，滤泡数量显著增多；21日龄到35日龄，滤泡由多边形逐渐转变成长方形；在35日龄时，粘膜上皮细胞逐渐增多，排列紧密，细胞核紧密排列成直线位于基底部。

Objective To explore the feasibility of functional magnetic resonance imaging in analysis of olfaction function with modified OEP-98C olfactometer and event-related design.

目的探讨以改进后的OEP-98C型嗅觉诱发电位仪作为嗅觉刺激器，事件相关设计的嗅觉功能磁共振成像分析嗅觉功能的可行性。方法采用改进后适应磁共振环境的OEP-98C型嗅觉诱发电位仪作为嗅觉刺激器对6名右利手年轻男性志愿者进行嗅觉刺激。

Over the past few years, we have adhered to the margins pilot, while summing up the experience in the dark improve, and we invite the four mapping units, according to the "phased implementation of the subregional mapping and cadastral mapping project, a map, several related databases" for the pilot, and gradually establish and perfect the mapping system : First, develop Fuzhou mapping management, Fuzhou administrative districts in operational and management activities in the real estate mapping units and individuals, thus greatly enhancing the management of our real estate mapping, mapping for the development of the cause.

为加强房地产产权产籍管理走出了一条新路。我市房产测绘体制改革是伴随着社会主义市场经济的建立和发展逐步铺开的。80年代中期，我市房屋产权登记开始恢复时，尚未建立专业的测绘队伍，在房屋产权确认中作为重要依据的图、档以及房屋面积都是由产权登记人员用皮尺到现场手工丈量确定。1985年房屋普查结束后，原普查人员组建成市测绘处，负责全市房产测绘工作，人员经简单培训后上岗，测量停留在手工皮尺操作上，技术没有规范，人员缺乏专业知识。

Firstly, a signalized point is stuck on a moving object to be tested, a microphone array and two video cameras are arranged, and the video cameras are demarcated to obtain a projection matrix; sound pressure signals of a sound source in the moving object to be tested are obtained by the microphone in an array mode, the dynamic video of the moving object to be tested is obtained and disassembled into an image by the video cameras; the signalized point on the moving object to be tested is identified in the video image and the matched signalized point is treated with three-dimension reconstruction to obtain the spatial location of the moving object to be tested; the sound pressure signals are treated with beam forming treatment to obtain a sound field characteristic function scattergram of the moving object to be tested, the video image is treated with spatial coordinate superposition frame by frame and restored into a dynamic video image.

首先在被测运动物体粘贴标志点，布置传声器阵列和两台摄像机，对摄像机进行标定，得到投影矩阵；传声器阵列获取被测运动物体中声源的声压信号，摄像机获取被测运动物体的动态视频，将动态视频拆解成图像；在视频图像中识别出被测运动物体上的标志点，对匹配后的标志点进行三维重构，获取被测运动物体的空间位置；对声压信号进行波束成型处理，得到被测运动物体的声场特征函数分布图，将其视频图像进行逐帧空间坐标叠加，并还原成动态视频图像。

Yongxiang Sheng fabric finishing plant, established in 2000, registered capital of 1000ò, the existing staff of more than 100 people, mainly in cloth finishing mainly from the plant since the plant, the main denim finishing the job, shrinkproof burning hair and so on, has been in terms of quality and quantity to achieve very good results, monthly production has reached 300 to 5,000,000 meters, and we hope that our commitment to the broad masses of customers to provide quality denim fabrics.

永祥盛布匹整理厂成立于2000年，注册资金1000万元，现有员工100多人，主要以布匹后整理为主，该厂自建厂以来，主攻牛仔布的后整理工作，防缩烧毛等，已在质量上和数量上取得非常好的成果，月产量已达300~500万米，我们希望我们的承诺能为广大客商提供优质的牛仔布料。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。