共查询到20条相似文献,搜索用时 781 毫秒
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<正>2014年的最后一个夜晚,上海逸夫舞台的观众们选择了一种不同的跨年方式——沪剧《51把钥匙》。这是国内首部描绘家庭医生形象的沪剧,也是文艺作品中涉及这一方面的首次尝试,一经上演便获得政府部门和广大观众的好评,题材新,接地气,舞台布景中的天井、阁楼、亭子间更是充满了上海风味,展现出沪剧"新"戏"老"唱的发展新风貌。《51把钥匙》改编自现实中的人和事。上海是全国第一个推行家庭医生制度改革的城市,目前共有588万市民与家庭医生签 相似文献
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Bioinspired polarized skylight navigation, which can be used in unfamiliar territories, is an important alternative autonomous navigation technique in the absence of Global Navigation Satellite System(GNSS). However, the polarization pattern in night environment with noise effects and model uncertainties is a less explored area. Although several decades have passed since the first publication about the polarization of the moonlit night sky, the usefulness of nocturnal polarization navigation is ... 相似文献
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Barfield A.F. Probert J. Browning D. 《Aerospace and Electronic Systems Magazine, IEEE》1993,8(3):40-47
The development of an all-terrain ground collision avoidance system (GCAS) in conjunction with a maneuvering terrain-following (TF) system is discussed. Both systems use a digital terrain database. These systems are presented concurrently because of their complementary mission role. The unprecedented pilot interaction available with the automatic systems provides a means to improve combat survivability significantly. The pilot is able to execute high rate turns, evasive maneuvers, and inverted ridge crossings while following the terrain contour. Safety is maintained in day, night and weather by the GCAS. The combination of these systems with an automated attack system, automatic target handoff system, night vision system, and a route planner to provide a lethal night attack capability is examined. Piloted simulation and preliminary flight test results are presented 相似文献
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朱志胜 《民用飞机设计与研究》2014,(2):88-92
飞机着陆灯与机场助航灯光系统为民用飞机夜航起飞、着陆提供照明,两者都十分重要。民航法规CCAR121部要求飞机必须装有至少两个着陆灯,而AC-97-FS-2011-01则要求民用机场必须配备助航灯光系统。分析了着陆灯与助航灯光两者在夜航着陆过程中的作用,并阐述两者的相互关系。 相似文献
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浅析公共娱乐场所消防安全现状及对策 总被引:1,自引:0,他引:1
王春梅 《沈阳航空工业学院学报》2005,22(6):182-183
近年来,为了满足广大人民群众对精神文化生括的需求,影剧院、录像厅、歌舞厅、卡拉ok厅、音乐茶座、夜总会等各种公共娱乐场所层出不穷。但是,全国公共娱乐场所的火灾形势一直很严峻,引起了各级领导和社会各界的广泛关注。对目前公共娱乐场所的消防安全问题进行安全探讨,并就如何进一步加强公共娱乐场所消防安全工作,提出解决对策。 相似文献
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目前,零压气球和超压气球固有的不足限制了高空气球的飞行能力。提出了 1种无需消耗压舱物和浮升气体即可实现昼夜高度自稳定且能够长时间迂回飞行的临近空间串联气球系统。结合了 2种气球的优点,避开了现阶段高空气球发展遇到的困难。建立了昼夜飞行高度一定的串联气球系统的数学模型,设计了能够利用准零风层风场条件实现迂回飞行的串联气球系统,通过与单一零压气球系统对比,验证了该系统的优势。数值仿真分析了零压气球形状、系统设计高度对超压气球尺寸、最大超压量等关键参数的影响,为设计飞行性能更好的系统提供了重要参考依据。 相似文献
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A relative navigation system for formation flight 总被引:1,自引:0,他引:1
A relative navigation system based on both the Inertial Navigation System (INS) and the Global Positioning System (GPS) is developed to support situational awareness during formation flight. The architecture of the system requires an INS/GPS integration across two aircraft via a data link. A fault-tolerant federated filter is used to estimate the relative INS errors based on relative GPS measurements and a range measurement obtained from the data link. The filter is constructed based on a reduced-order model of the relative INS error process. A method for analyzing the filter performance is presented. A case involving two helicopters in formation flight is studied under three different night trajectories to account for the effect of vehicle motion on the INS state transition matrix. The results of the covariance analysis are compared with actual night results over an instrumented test range. 相似文献
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何小亮 《民用飞机设计与研究》2010,(4):58-62
民用飞机产品市场要求论证是民机型号研制中极为重要的环节。飞机制造商唯有准确地把握市场的要求,其民机型号的发展才能有的放矢。市场调研是进行民用飞机产品市场要求论证不可或缺的主要手段。阐述了市场调研的主要步骤和方法,以及民用飞机产品市场要求的主要内容和论证工作流程,并结合系列化和共通性、市场定位、经济性等大型客机市场要求论证中的几个关键问题进行了论述,充分展示了市场调研在民用飞机产品市场要求论证中的重要作用。 相似文献
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K. H. Schmelovsky 《Space Science Reviews》1968,8(1):74-91
The results from ionospheric beacon observations are compared with the theory of F-layer and outer ionosphere. Near sunspot minimum the total electron content up to 1000 km at medium latitudes is 1–2 × 1017 m-2 in the afternoon and about 0.3 × 1017 m-2 at night. The diurnal and latitudinal variations are more irregular during summer than during winter. Near sunspot maximum the respective values are about 1.5 × 1017 m-2 at night, 6–7 x 1017 m-2 near winternoon, 4 × 1017 m-2 near summernoon.The complete theory of diffusion in a multi-ion plasma gives very complicated expressions. Simpler approximations can be found respectively. Some models were calculated numerically and the dependence of the total electron on the parameters of the balance equation is investigated.Comparison with experimental results shows, that some main features of the diurnal and latitudinal variations of the total electron can be explained. The seasonal anomaly, the slow decrease in the late night hours and the large increase toward equator cannot be explained without additional assumptions. 相似文献
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随着国际银行间债券市场的迅速发展,我国急需建立一套比较完善的交易机制,以提高债券流动性,促进市场的健康发展。发达的证券市场采用的做市商制度,为探讨我国银行间债券市场交易机制的改革提供了借鉴。在讨论做市商理论的基础上,对我国银行间债券市场推行做市商制度的必要性、可行性以及目前存在的问题进行了讨论,并提出了相关的建议。 相似文献
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中国航空运输市场季节变动特点与对策研究 总被引:2,自引:0,他引:2
彭语冰 《中国民航学院学报》2004,22(4):7-11
运用季节指数分析方法,对1997--2001年间中国航空旅客运输市场和航空货物运输市场的季节性变动进行分析,并提出了根据季节变动规律合理组织生产和调配运力的建议。 相似文献