共查询到11条相似文献,搜索用时 31 毫秒
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《财富》(中文版)联合银则企业管理咨询(上海)有限公司(InnoCSR)于3月20日发布了2012年度《财富》(中文版)企业社会责任排行榜。今年是《财富》(中文版)和银则企业管理咨询(上海)有限公司连续第二年发布中国企业社会责任排行 相似文献
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总收入首次突破1000亿元,利润超过50亿元,五机定型、五机鉴定、两机首飞、四机立项,三家公司首发上市、六家公司定向增发……这是本刊记者从1月21日召开的中国一航2008年峰会上得到的几组数据,它们反映出中国一航在2007年取得的成绩与进步。在实现2010年跨入世界500强的目标基础上,中国一航总经理林左鸣在会议上提出了又一个雄伟的目标一每年收入增长30%,到2017年,集团公司收入达到1万亿元。 相似文献
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过去的2004年,对中国一航的民机产业来说是非同寻常的一年。11月,西飞集团研制的“新舟”60涡桨支线飞机在国务院领导的亲自关怀下,在中国一航领导和有关部门的指挥下,在商业部、外交部和民航总局的大力支持下,远销非洲津巴布韦,实现了对外销售零的突破;12月,中航技与西飞签署了20架“新舟”60的采购合同,这使得一度陷入市场困顿的“新舟”60重新燃起希望之光。与此同时,备受瞩目的ARJ21喷气式支线飞机项目跨越了重重困难,在2005年到来前夕,完成了预定的飞机90%的结构和50%的系统发图的重大节点,为下一步项目进入试验和全面生产打下坚实基础 相似文献
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3年来,中航工业深入贯彻落实科学发展观,坚决执行中央关于推进航空工业改革调整的战略部署,着眼于肩负起航空报国,强军富民的神圣使命,深刻把握世界航空工业发展的科学规律和成功道路,确立并全面实施两融、三新、五化、万亿的发展战略,努力建设具有国际竞争力的跨国公司,新航空、大航空、强航空形象日益明晰,展现出了新的生机与活力。 相似文献
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2007年,大型飞机研制重大科技专项正式立项,吹响了我国由世界航空大国向航空强国冲锋的号角。机载设备是民用航空产业链的重要组成部分,素有一代平台,几代设备之谓。 相似文献
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M. Roos-Serote 《Space Science Reviews》2005,116(1-2):201-210
Titan’ atmosphere shows some similarities with that of the Earth, in terms of composition and surface pressure. Also, its
seasonal cycle is similar, as Titan’ obliquity is about 27°(23°,5 for the Earth), although it is about 30 times as long.
Titan’ haze exhibits an albedo contrast (NSA for North-South Asymmetry) that is changing seasonally. From the analysis of
Voyager and Hubble Space Telescope data, we learned that at short visible wavelengths, the albedo of the winter hemisphere
is lower by 10-20% than that of the summer hemisphere. This asymmetry peaks at 450 nm and reaches maximum amplitude around
Titan’ equinoxes. It reverses in about five years, faster than a season which spans seven years. At longer wavelengths, longward
of 700 nm, the asymmetry is inverted. The NSA reversal process in the red and in the UV seems to lead the reversal in the
blue by 1 or 2 years. No valid explanation exists for this lag, at least in the red.
The results from a recent model which couples atmospheric dynamics, haze microphysics and transport, as well as photochemistry,
show that the NSA and its seasonal changes can be explained by
an accumulation of haze particles at the winter pole. This is due to the pole-to-pole Hadley circulation pattern that is present
during most of Titan’ year and rapidly disrupts at the time of the equinoxes. This model can also explain the observed cooler
stratospheric temperatures and higher abundances of heavy hydrocarbons and nitriles in the winter polar region. In addition,
it provides a mechanism for the formation of a detached haze layer around 300–400 km altitude, as well as the existence of
a polar hood.
Thus, it appears that the latitudinal contrasts we observe on Titan are conveniently tracing for us the dynamical behavior
of its atmosphere. 相似文献
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针对小鹰500飞机的设计和使用特点,选用了FAA推荐的通用飞机实测载荷谱数据,按照民机的TWIST编谱原则编制出用重心过载表示的“飞-续-飞”随机疲劳试验载荷谱,用于小鹰-500飞机机翼疲劳试验,并参照国外文献中有关尾翼载荷谱的保守处理方法,采用了从重心载荷谱计算出配套平衡的平尾机动载荷,将其幅值放大1.2倍和频次放大3倍的做法,编制出了平尾疲劳试验载荷谱。 相似文献
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等离子弧不仅可以作为产热机构,同时可以作为超声发生机构.本文介绍了等离子弧激发超声的特点及其检测.利用不同频率超声等离子弧进行喷涂试验,使用光学显微镜和电子扫描显微镜对制备的氧化锆陶瓷涂层的结构进行了观察,发现超声的加入明显改变了陶瓷涂层气孔的数量、大小、形状和分布,并且不同频率的超声对气孔的影响效果也有明显的不同.文中对不同频率超声对等离子喷涂陶瓷涂层的结构影响的规律及其机理进行了研究.气孔对陶瓷的性能有显著的影响,它使陶瓷的密度减小,并能吸收震动,这是有利的一面;它同时又使陶瓷强度降低,介电耗损增大,电击穿强度下降.这一研究成果将为性能陶瓷涂层的制备提供一条可能的途径. 相似文献
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The problem of state estimation and system structure detection for discrete-time stochastic systems with parameters which may switch among a finite set of values is considered. The switchings are modeled by a semi-Markov, or Markov, chain with known transition statistics. A fixed time delay (lag) is allowed in estimation (smoothing) and detection. The optimal solutions require geometrically increasing computations and storage with time. Suboptimal solutions are proposed to alleviate this problem and simulation results are presented to illustrate the effectiveness of the proposed algorithms and the advantages of introducing a delay in processing of the observations. 相似文献
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介绍了K8飞机L8—6440—500核心喷管装配焊接工艺方法,包括焊接工艺的制定和装配夹具的选择等。 相似文献