针对多子阵合成孔径声纳（SAS）传统的扩展波数域（ωk）算法中STOLT插值误差引入的相位误差，提出了一种改进的适用于多子阵SAS的ωk成像算法。该算法继承了传统的扩展ωk算法能够与运动补偿相结合的优点，通过对多子阵SAS的双根号形式距离历程进行近似和单基等效化，将多子阵的回波信号等效为单阵收发合置信号，针对扩展ωk算法中STOLT变换可能引入的插值误差，通过引入新的一致距离徙动校正因子，补偿了插值导致的相位误差，实现了多子阵SAS图像的重建。仿真实验表明了该算法的有效性。

Aimed at the phase error caused by STOLT interpolation in the extended wavenumber do-main (ωk) algorithm ,an improved algorithm is proposed based on the extended ωk algorithm .The al-gorithm inherits advantages from the traditional extended ωk algorithm being able to combine with motion correction for the imaging of multiple receiver synthetic aperture sonar (SAS) in the case of no stop-hop-stop .T he point target response of multiple receiver SAS is transferred to the signal response si-mi-lar to the monostatic SAS by range history approximation and miltistatic-to-monostatic equiva-lence . By introducing a novel bulk range migration correction factor , the phase error caused by STOLT interpolation in the extended ωk algorithm is compensated sufficiently .Finally ,the image of multiple receiver SAS is perfectly reconstructed .T he simulation results show the proposed algorithm is effective .

讨论在考虑过剩多子、双极漂移、双极扩散以及丹倍电场作用下p-n结载流子的输运问题。采用不同于传统肖克莱理论的方法，从过剩多子角度入手，以长基区p+-n结的n型准中性区为例，研究了其中的载流子输运。在考虑双极扩散和双极漂移过程后，指出因双极扩散而产生的丹倍电场在调节载流子输运中的重要作用，并用实验测量、理论分析和数值模拟方法对双极输运和丹倍电场与过剩多子之间的关系加以验证。指出在一个扩散长度内多子电子的漂移电流受到丹倍电场强有力的调节作用。提出了考虑丹倍电场后的漂移电流以及另外三种电流分量和总电流模型，其结果和数值模拟相符，这一模型有助于更加全面准确地理解半导体p-n结理论。

The carrier transport characteristics of p-n junction were discussed in the consideration of excess majority bipolar drift, ambipolar diffusion and the effect of Dember field. A method different from the traditional Shockley theory was used, with a long based p+-n junction as an example, to study the carrier transportation. In view of the bipolar drift and ambipolar diffusion, the significant role of Dember field in modulating the carrier transport was indicated. The relation of ambipolar transport, Dember field and excess majority carrier was testified by experimental measurement, analysis and numerical simulation. Within a diffusion length the majority-electron drift current was enhanced dramatically by Dember field. The analytical model of majority-electron current and total current was proposed and it showed an admirable agreement with the numerical simulation. The analytical model provides a more comprehensive and more accurate understanding of the current character and helps to b

节点定位技术是无线传感器网络的关键技术,为减小DV-Hop算法的节点定位误差,提出一种多子群粒子群(MPSO)算法优化DV-Hop的节点定位算法(MPSO-DV-Hop)。通过设置门限值修正节点间的跳数,提高了跳段距离估算精度,DV-Hop的第3阶段引入MPSO算法,对节点定位误差进行校正,通过引入多子群加快算法收敛速度,提高DV-Hop算法的节点定位精度,在MATLAB2008平台上对算法仿真分析。结果表明,MPSO-DV-Hop算法在不增加成本情况下,提高了传感器的节点定位精度,具有较高的应用价值。

Localization is one of most important technolony of wireless sensor network, in order to reduce the error of node localization for DV-Hop algorithm in wireless sensor networks, a node localization algorithm based on Multi-population Particle Swarm Optimization(MPSO)algorithm and DV-Hop algorithm is proposed. The hops between nodes are modified by threshold value to improve the estimating accuracy of the hop distance, and then in the third stage of DV-Hop algorithm which MPSO algorithm is used to correct the localization error, the simulation analysis of MPSO-DV-Hop algorithm is carried out on MATLAB2008. The results show that the algorithm can improve the localization accuracy of the sensor without increasing cost situation. It has a high pratical value.

通过对相关人口调查数据的研究,发现随着社会的进步以及文化的传播,"重男轻女"、"多子多福"这些思想在人们的脑海中正在慢慢淡化。但是,由于文化程度不高仍然有一部分农村育龄妇女思想上对生育性别存在偏差。针对当前我国农村居民生育意愿及性别偏好的现状,提出一些意见,实现优生优育。

Through the study of relevant census data, found that along with the progress of society and culture,"men are superior to women","multi children and Fu"the idea in people''s mind is slowly fade. However, due to the cultural level is not high there are still a part of rural women of childbearing age thought to gender bias. Based on the current status of China''s rural residents will fertility and gender preference, and put forward some ideas, for eugenics.

社会是一个复杂、多元化、多子系统的巨型结构体系,在整个社会发展建设中,离不开各类素的支持与配合,尤其是在城市化发展中,这些因素更是发挥着极为关键和重的作用。与此同时,这些问题也是影响和制约城市发展的关键所在。本文就城市规划中公共利益的划分和实现进行了分析,以供相关工作人员参考借鉴。

The society is a complex giant system, diversified, multiple system, in the development of the whole society con-struction, cannot do without support and cooperation of al kinds of elements, and these factors are also playing a very im-portant role especial y in city development. At the same time, these problems are also affected and restricting the develop-ment of the city''s key. This article has carried on the analysis the realization and division of public interest in city planning, in order to offer a reference for relevant staff.