共查询到20条相似文献,搜索用时 70 毫秒
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2014年11月27日至28日.海关总署在天津召开全国海关缉毒工作会议、会议总结了海关十年缉毒工作,分析当时毒品走私形势,对进一步加强海关查缉毒品走私工作以及集中开展专项打击行动作出了具体部署。2005年至今,全国海关共立案侦办毒品走私犯罪案件3978起,抓获犯罪嫌疑人4436名,缴获海洛因、冰毒、可卡因、鸦片等各类毒品19.63吨,麻黄碱、醋酸酐等易制毒化学品372吨。 相似文献
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俗话说得好,“有什么最怕有病”,可是人生在世,总难免有得病的时候,谁得了病都想找个好大夫问个清楚,最好能药到病除。但是,由于国内医疗资源的有限性,以及医疗资讯不发达,因此,要找一个说得清、道 相似文献
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跟踪收敛性是角跟踪系统模拟器性能指标的重要体现。角跟踪系统常会因为方位俯仰信号的正交性不好造成交叉耦合较大或者链路处理时间较长引起误差积累,导致角跟踪收敛性不好。为此,研制了角跟踪系统模拟器。该模拟器根据天线方向图设计查找表,控制模拟角跟踪系统和差路信号幅度和相位,从信号幅度和相位处理环节减小交叉耦合;通过缩短角跟踪系统模拟器软硬件处理时间,减小误差积累。从减小交叉耦合和缩短系统处理时间两方面着手,较好地实现了增强角跟踪系统模拟器跟踪收敛性的目的。 相似文献
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本文介绍了欧洲空间局(ESA)目前广泛使用的航天测控系统,描述了两种系统:Meteosat测距系统(MRS)和多用途跟踪系统(MPTS)。MRS现在正用于Meteosat,其设计满足其它任务与多点测距共享一个信道的要求。结果设计出一种以相位分层数据格式为基础的新颖的编码测距技术且得到了发展。MPTS(原深跟踪系统-DSTS)首先因Giotto任务而研制并推广使用。在稍后阶段中,该系统增加了近地跟踪 相似文献
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《中国对外贸易(英文版)》2011,(17)
Apple Inc.is advising software developers to stop using a feature in software for its iPhones and iPads that has been linked to privacy concerns,a move that would also take away a widely used tool for tracking users and their behavior. Developers who write programs for Apple's iOS operating system have been using a unique identifier specific to each device to gather per- 相似文献
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Chun Yi 《中国对外贸易(英文版)》2008,(13):14-15
The "three most-wanted" goods, those seen as a symbol of wealth for Chinese families, has seen an evolution from specific products to general services with average values that first increased from RMB 100 to RMB 10,000, and now have moved upwards of RMB 100,000. While this measure is not the most scientific, it reflects the great changes China has undergone, and also mirrors the transformation of Chinese lifestyle. 相似文献
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本文研究用递推算法实现只测量到达角和多普勒频移的无源双基地雷达的目标运动分析。基于Unscented卡尔曼滤波器和强跟踪滤波器,提出了一种新的强跟踪Unscented滤波器算法。新算法在无源双基地雷达目标跟踪的仿真实验中显示了高精度鲁棒滤波的性能。 相似文献
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针对传统单脉冲跟踪方式中难以同时兼顾跟踪伺服系统的稳定性和高精度问题,采用了一种计算机辅助跟踪技术。介绍了技术的原理并给出了具体的实现方法,然后用Matlab的Simulink工具箱进行了仿真。仿真结果表明,采用计算机辅助跟踪技术可以在不影响跟踪伺服系统稳定性的前提下,大大提高其跟踪精度。 相似文献
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This paper addresses a curious disjuncture between one aspect of regional development theory and the empiricism required to test its implications.On the one hand, researchers long have argued that firm births fuel the growth and development of regional economies. Just as long, however, they have employed different, often ad hoc, approaches to the definition and measurement of key concepts and relationships. The inconsistency among the studies in this literature creates a validity problem. We begin by providing an omnibus definition of a start-up that applies to some degree to all the articles we reviewed, namely, that it is new, active, and independent. We explain why all three criteria should be applied, rather than a subset. Second, we review the data sources that are commonly used to identify start-ups, and compare them using seven criteria. We conclude that ES202 data is the best source. Third, we develop a step-by-step tracking system for identifying new firms. By matching ES202 files from two different years and applying direct enumeration techniques, it is possible to identify newly created establish-ments during that time period with accuracy. This article serves both to explain the differences among the published studies of new firms and economic development, and to provide a common standard that can enhance the validity of future work on the topic. 相似文献