航空运动

国际鸟人大赛在英国西苏塞克斯举行 7月5日,一年一度的国际鸟人大赛在英国西苏塞克斯海滩举行,来自世界各地的参赛者,展开自制的翅膀从渥新码头一跃而下,在空中滑翔数秒钟后扎进海水中。按照比赛规则,在掉入海水前,谁飞得最远,谁就是冠军。有1万多名观众聚集在海滩观看比赛。来自英格兰萨里郡的迪恩·冈,在空中滑翔了27.9米远夺得     

大九湖的美·是一种原生态的美

<正>美在她的安详宁静:在淡淡的云雾笼罩下,阳光穿越群山徐徐升起,走在软软的草地上,如入仙境。成群的牛羊沐浴着阳光,悠然自得的享用着丰美的水草,好一副静谥的田园风光画卷,这里没有滚滚的热浪,也没有城市的喧嚣,有的只是世外桃源般得壮美和天然去雕饰的天籁。美在她的自然和谐:在这静谥安详的世界里,珍贵稀有的生命为之欢悦,獐鹿在湖边灌木丛中驰突、雉鸟在沼泽草丛里啁啾吟唱,游鱼在湖底的蓝天白云中翱翔。在动静结合的氛围里,用这样悠然天成的诗情画意,引领我们寻找心里的栖息地。     

空客与中国工业合作更广泛、更深入

2011年,空客与中国工业合作稳步发展,突出体现在:空客及其母公司欧洲宇航防务集团扩大在华原材料采购;空客在中国各工业合作项目进展顺利,配套零部件在华生产幅度进一步提高;空客在华各合作项目之间联系更加紧密,     

简讯

波音公务机在华业务持续增长 4月14日,波音公司在亚洲公务航空会议及展览会（ABACE）上宣布,过去一年中有5架波音公务机在中国市场投入运营,超远航程公务机市场在中国持续增长。     

“现在，每个人都能飞了”——访亚洲航空集团首席执行官冬尼&#183;费南德斯

在世界航空运输业，低成本航空公司以自己的独特的经营模式挑战着传统航空公司的地位，在美国、欧洲、亚洲，低成本航空公司的市场份额分别占到了1／4、17％和6％。尽管有不少低成本航空公司并没有成功，但这个市场已经出现了一批佼佼者：在美国有西南航空公司、蓝色喷气航空公司，在欧洲有瑞安航空公司，而在亚洲有在马来西亚成长起来的亚洲航空公司（AirAsia）。如今，     

大九湖的美·是一种原生态的美

<正>美在她的安详宁静:在淡淡的云雾笼罩下,阳光穿越群山徐徐升起.走在软软的草地上,如入仙境。成群的牛羊沐浴着阳光.悠然自得的享用着丰美的水草,好一副静谥的田园风光画卷.这里没有滚滚的热浪.也没有城市的喧嚣,有的只是世外桃源般得壮美和天然去雕饰的天籁。美在她的自然和谐:在这静谥安详的世界里,珍贵稀有的生命为之欢悦.獐鹿在湖边灌木丛中驰突,雉鸟在沼泽草丛里啁瞅吟唱,游鱼在湖底的蓝天白云中翱翔。在动静结合的氛围里,用这样悠然天成的诗情画意,引领我们寻找心里的栖息地。     

智能技术 赢得市场——本刊总编辑刘柱专访赫克中国总经理姚雪先生

赫克集团公司成立于1968年,总部位于美国印第安那首府印第安纳波利斯,赫克公司的控制系统在业内广为人知,"人机"对话技术也一直走在行业的前沿。在当今世界,智能化是所有系统制造商共同努力发展的方向,而赫克在这一领域处于绝对的领先地位。近年来,赫克在中国取得了不错的成绩,成功进入高端加工行业,以其先进的技术、成熟稳定的产品和综合方案能力证明了其卓越的价值。     

浅述细缝排水在机场中的应用

空客A320系列飞机天津总装线工程总投资预计在80亿至100亿元人民币之间。总装线将依照空中客车在德国汉堡的最先进标准进行建设,在中国总装和交付的飞机与在欧洲制造的飞机标准完全相同,是空中客车公司唯一在欧洲以外建立的生产组装基地。     

大九湖的美·是一种原生态的美

<正>美在她的安详宁静:在淡淡的云雾笼罩下,阳光穿越群山徐徐升起,走在软软的草地上,如入仙境。成群的牛羊沐浴着阳光,悠然自得的享用着丰美的水草,好一副静谥的田园风光画卷,这里没有滚滚的热浪,也没有城市的喧嚣,有的只是世外桃源般得壮美和天然去雕饰的天籁。美在她的自然和谐:在这静谥安详的世界里,珍贵稀有的生命为之欢悦,獐鹿在湖边灌木丛中驰突,雉鸟在沼泽草丛里啁啾吟唱,游鱼在湖底的蓝天白云中翱翔。在动静结合的氛围里,用这样悠然天成的诗情画意,引领我们寻找心里的栖息地。     

大九湖的美·是一种原生态的美

<正>美在她的安详宁静:在淡淡的云雾笼罩下,阳光穿越群山徐徐升起,走在软软的草地上,如入仙境。成群的牛羊沐浴着阳光,悠然自得的享用着丰美的水草、好一副静谥的田园风光画卷,这里没有滚滚的热浪,也没有城市的喧嚣,有的只是世外桃源般得壮美和天然去雕饰的天籁。美在她的自然和谐:在这静谥安详的世界里,珍贵稀有的生命为之欢悦,獐鹿在湖边灌木丛中驰突,雉鸟在沼泽草丛里啁啾吟唱,游鱼在湖底的蓝天白云中翱翔。在动静结合的氛围里,用这样悠然天成的诗情画意,引领我们寻找心里的栖息地。     

Exploring The Saturn System In The Thermal Infrared: The Composite Infrared Spectrometer

The Composite Infrared Spectrometer (CIRS) is a remote-sensing Fourier Transform Spectrometer (FTS) on the Cassini orbiter that measures thermal radiation over two decades in wavenumber, from 10 to 1400 cm^{− 1} (1 mm to 7μ m), with a spectral resolution that can be set from 0.5 to 15.5 cm^{− 1}. The far infrared portion of the spectrum (10–600 cm^{− 1}) is measured with a polarizing interferometer having thermopile detectors with a common 4-mrad field of view (FOV). The middle infrared portion is measured with a traditional Michelson interferometer having two focal planes (600–1100 cm^{− 1}, 1100–1400 cm^{− 1}). Each focal plane is composed of a 1× 10 array of HgCdTe detectors, each detector having a 0.3-mrad FOV. CIRS observations will provide three-dimensional maps of temperature, gas composition, and aerosols/condensates of the atmospheres of Titan and Saturn with good vertical and horizontal resolution, from deep in their tropospheres to high in their mesospheres. CIRS’s ability to observe atmospheres in the limb-viewing mode (in addition to nadir) offers the opportunity to provide accurate and highly resolved vertical profiles of these atmospheric variables. The ability to observe with high-spectral resolution should facilitate the identification of new constituents. CIRS will also map the thermal and compositional properties of the surfaces of Saturn’s icy satellites. It will similarly map Saturn’s rings, characterizing their dynamical and spatial structure and constraining theories of their formation and evolution. The combination of broad spectral range, programmable spectral resolution, the small detector fields of view, and an orbiting spacecraft platform will allow CIRS to observe the Saturnian system in the thermal infrared at a level of detail not previously achieved.This revised version was published online in July 2005 with a corrected cover date.     

The polars

The class of cataclysmic variables called Polars, or AM Her systems, is comprehensively reviewed. Each part of these systems, from the two underlying stars, to the accretion region and the stream, is considered in turn. New developments in our understanding of the accretion region are outlined in some detail.     

The Jovian magnetodisk

Magnetic field measurements made by the vector helium magnetometers on board Pioneers-10 and 11 reveal the existence of a current sheet (thickness 2R _J) carrying an eastward current. Self-consistent studies of the current sheet show that the magnitude of the current is of the order of 10⁺² Am⁺¹ and that the current is carried by a hot (T>1 keV) plasma, the density of which varies between 1 cm⁺³ at 30R _J to 10⁺² cm⁺³ at 80R _J. The current sheet is warped azimuthally and parallel to the magnetic dipole equator.The existence of an azimuthal field component indicates a poloidal plasma flow transporting some 10²⁹ ions per second from Jupiter into the outer magnetosphere. It is shown that, if the outer magnetosphere is in a steady state, this plasma must be transported outward within the current sheet by a diffusion process which is faster than the one responsible for particle transport in the inner magnetosphere but slower than Bohm diffusion. It is suggested that the diffusion is due to the observed mhd turbulence in the current sheet. Such a model requires the existence of open field lines along which particles can escape freely into interplanetary space.Proceedings of the Symposium on Solar Terrestrial Physics held in Innsbruck, May–June 1978.     

The MITA satellite

Carlo Gavazzi Space, with its 20 years experience in space market, has been involved in the small satellites activities for the last 10 years. Initially working on R&D in the MICROSAT project, it has gained experience in real satellite building in the SAFIR-2 programme, becoming finally responsible of the ASI satellite programme, MITA (Small Italian Advanced Technology satellite). The first launch is planned in July 2000, while the second launch, with the AGILE payload, is currently planned for the year 2002.     

复合材料层合板的开口补强研究进展

复合材料在航空结构中的应用越来越广,在复合材料层合板上开口对其结构力学性能的影响需引起研究人员的重视。针对国内外近十年来的研究工作,系统地回顾了复合材料层合板的开口力学性能及补强设计方法的研究进展,从开口区域应力集中、开口层板稳定性研究、失效模式及补强方法等方面做了阐述;并对未来含有开口的复合材料结构设计的研究提出了一些建议。     

The Heliospheric Termination Shock

The heliospheric termination shock is a vast, spheroidal shock wave marking the transition from the supersonic solar wind to the slower flow in the heliosheath, in response to the pressure of the interstellar medium. It is one of the most-important boundaries in the outer heliosphere. It affects energetic particles strongly and for this reason is a significant factor in the effects of the Sun on Galactic cosmic rays. This paper summarizes the general properties and overall large-scale structure and motions of the termination shock. Observations over the past several years, both in situ and remote, have dramatically revised our understanding of the shock. The consensus now is that the shock is quite blunt, is with the front, blunt side canted at an angle to the flow direction of the local interstellar plasma relative to the Sun, and is dynamical and turbulent. Much of this new understanding has come from remote observations of energetic charged particles interacting with the shock, radio waves and radiation backscattered from interstellar neutral atoms. The observations and the implications are discussed.     

碳纤维复合材料孔加工质量试验研究

碳纤维复合材料零件上存在大量的装配工艺孔,采用传统孔加工方式过程中容易导致分层、纤维
撕裂等缺陷. 本文通过钻削和螺旋铣削方式加工碳纤维复合材料(CFRP),对比两种孔加工方法的加工质量,
分析了缺陷存在的原因,发现在碳纤维复合材料上采用螺旋铣削制孔方式是可行的,对碳纤维复合材料孔加工
工艺具有一定的参考价值。     

芬兰国家馆--冰壶

力举"优裕、才智与环境"三大元素,围绕2010年上海世博会主题"城市,让生活更美好!",芬兰国家馆的设计,以其突出和未来实现"更美好生活"的理念而独树一帜。     

On The 53Mn Heterogeneity In The Early Solar System

It is well established that the prolonged and thorough mixing of numerous nucleosynthetic components that constitutes the matter in the solar nebula resulted in an essential isotopic homogeneity of the solar system material. This may or may not be true for the short-lived radionuclides which were injected into or formed within the solar nebula just prior to or during solar system formation. Distinguishing between their heterogeneous or homogeneous distribution is important because the short- lived radionuclides are now widely used for the relative chronology of various objects and processes in the early solar system and as constraints for models of nucleosynthesis. The recent studies of the ⁵³Mn-⁵³Cr isotope system (half life of ⁵³Mn is 3.7 Ma) in various solar system objects have shown that the relative abundance of radiogenic ⁵³Cr is consistent with essentially homogeneous distribution of ⁵³Mn in the asteroid belt. Thus, the relative ⁵³Mn-⁵³Cr chronometer can be directly used for dating samples which originated in the asteroid belt. Importantly, however, all meteorite groups studied so far indicate a clear excess of ⁵³Cr as compared to Earth and to a lunar sample, which exhibits also a terrestrial ⁵³Cr/⁵²Cr ratio. The results from the Martian (SNC) meteorites show that their ⁵³Cr excesses are less than half of those found in the asteroid belt bodies. Thus, the characteristic ⁵³Cr/⁵²Cr ratio of Mars is intermediate between that of the Earth-Moon system and those of the other meteorites. If these ⁵³Cr variations are viewed as a function of the heliocentric distance, the radial dependence of the relative abundances of radiogenic ⁵³Cr is indicated. This observed gradient can be explained by either an early, volatility controlled, Mn/Cr fractionation within the nebula or by an initial radial heterogeneous distribution of ⁵³Mn. Although model calculations of the Mn/Cr ratios in the bulk terrestrial planets seem to be inconsistent with the volatility driven scenario, the precision of these calculations is inadequate for eliminating this possibility. In contrast, recent studies of the ⁵³Mn-⁵³Cr system in the enstatite chondrites indicate that, while their bulk Mn/Cr ratios are essentially the same as in ordinary chondrites, the ⁵³Cr excess in bulk enstatite chondrites is three times lower than that in the bulk ordinary chondrites. This difference cannot be explained by a Mn/Cr fractionation and, thus, strongly suggests that a radial heterogeneous distribution of ⁵³Mn must have existed in at least the early inner solar system. Using the observed gradient and the ⁵³Cr/⁵²Cr ratio of the bulk enstatite chondrites, their parent body(ies) formed at ∼1.4 AU or somewhat closer to the Sun. This revised version was published online in June 2006 with corrections to the Cover Date.