亨克尔He177“鹰狮”式重型轰炸机驾驶感受

１９４４年９月２日的午后，英国范堡罗空军基地的工作人员都放下了手边的工作，引颈眺望着身漆法国空军环徽及三色条纹的亨克尔Ｈｅｌ７７Ａ—５“鹰狮”式轰炸机的抵达……虽然在二战后期的岁月里，不时有形状奇特的德国飞机通过各种途径被运到这里，但最引起轰动的确是这一次。神秘的重型轰炸机 早在１９４０年６月３０日，我们就从德国战俘嘴里得知，一种重型轰炸机已经开始在纳粹空军中服役，并耳闻了一些关于其主要性能的含糊描述。从此以后，大家一直盼望着与这种轰炸机在空中遭遇，以一睹它的“芳容”，但它却一直深居简出。 于是我…     

Fw189福克·沃尔夫的“猫头鹰”

漂亮的飞机往往可以得到大家的欣赏，但有时一些外形狰狞怪诞、带有异国风味且性能优越的飞机更能够吸引飞行员的目光，他们会在心中揣摩着自己驾驶它的感受──这也许是人类好奇的天性位然．德国福克· 乌尔夫公司出品的Ｆｗ１８９“空中眼睛”，虽然缺乏强劲的动力，亦无德国飞机普遍具有的流畅外表，布局上更偏离了主流设计，却令我憧憬并且最终成为爱不释手的飞机之。 初看著名设计师库尔特 ·谭克教授的此项作品，的确感到太缺乏魅力──火柴般纤细的双尾撑、弱小的发动机，以及巨大球茎状玻璃机头，实属异类。然而它却是以实用主义为…     

迎接即将到来的发动机维修高峰

CFM56-5B、-7B 和 IAE V2500发动机的备用发动机和维修人员面临紧缺。曾在本世纪初掀起购买狂潮的CFM56和v2500发动机,很快将结束"蜜月期"进入返厂维修的高峰     

低成本早期预警机走俏

在澳大利亚新的早期预警和指挥飞机中将加装一些新的传感器,使得机组人员能看到更远的距离,提高他们发现小型、隐身目标的能力,并能窃听到潜在敌人的谈话。 今年年初,澳大利亚提出的对中等尺寸、成本适中的空中早期预警和指挥飞机(AEW＆C)的要求引发了各国厂商的激烈竞争。这一全新的市场被证明将有55～7O架的需求。 由于这一较低价格的早期预警机的市场已经走向成熟,所以澳大利亚想得到这种较低价格早期空中预警和指挥飞机的前景是乐观的。预计这种档次飞机对于     

Investigation of low-energy proton effects on aptamer performance for astrobiological applications

Biochips are promising instruments for the search for organic molecules in planetary environments. Nucleic acid aptamers are powerful affinity receptors known for their high affinity and specificity, and therefore are of great interest for space biochip development. A wide variety of aptamers have already been selected toward targets of astrobiological interest (from amino acids to microorganisms). We present a first study to test the resistance of these receptors to the constraints of the space environment. The emphasis is on the effect of cosmic rays on the molecular recognition properties of DNA aptamers. Experiments on beam-line facilities have been conducted with 2 MeV protons and fluences much higher than expected for a typical mission to Mars. Our results show that this irradiation process did not affect the performances of DNA aptamers as molecular recognition tools.     

The O/OREOS mission: first science data from the Space Environment Survivability of Living Organisms (SESLO) payload

We report the first telemetered spaceflight science results from the orbiting Space Environment Survivability of Living Organisms (SESLO) experiment, executed by one of the two 10?cm cube-format payloads aboard the 5.5?kg Organism/Organic Exposure to Orbital Stresses (O/OREOS) free-flying nanosatellite. The O/OREOS spacecraft was launched successfully to a 72° inclination, 650?km Earth orbit on 19 November 2010. This satellite provides access to the radiation environment of space in relatively weak regions of Earth's protective magnetosphere as it passes close to the north and south magnetic poles; the total dose rate is about 15 times that in the orbit of the International Space Station. The SESLO experiment measures the long-term survival, germination, and growth responses, including metabolic activity, of Bacillus subtilis spores exposed to the microgravity, ionizing radiation, and heavy-ion bombardment of its high-inclination orbit. Six microwells containing wild-type (168) and six more containing radiation-sensitive mutant (WN1087) strains of dried B. subtilis spores were rehydrated with nutrient medium after 14 days in space to allow the spores to germinate and grow. Similarly, the same distribution of organisms in a different set of microwells was rehydrated with nutrient medium after 97 days in space. The nutrient medium included the redox dye Alamar blue, which changes color in response to cellular metabolic activity. Three-color transmitted intensity measurements of all microwells were telemetered to Earth within days of each of the 48?h growth experiments. We report here on the evaluation and interpretation of these spaceflight data in comparison to delayed-synchronous laboratory ground control experiments.     

中国:希腊旅游业的巨大商机

众所周知,中国和希腊都是两个有着伟大的悠久传统的国家,他们为世界文明史作出了卓越的贡献.在如今这个高科技和全球化发展的时代,中国和希腊是人民团结友好维护和平的国家之一,体现着奥林匹克的精神.     

涡桨飞机过剩

如果有市场需求,制造商会考虑将停飞的涡桨飞机改装成货机。但客改货并不是“万能良药”。