我的中国老师见到了UFO

在中国人民大学对外语言文化学院工作的李禄兴老师 ,于１９９８年１２月２０日下午４时３０分左右 ,和４个朋友在人大南侧东风２楼前闲聊的时候 ,听到一个过路人突然大叫一声 :“快看 ,北边有个什么东西？”李老师他们也都朝那个方向望去 ,发现一个形状模糊、朦胧发光的物体静止在仰角６０°的位置 ,不停旋转着。发现了ＵＦＯ ,停下来观看的人越来越多。大约过了５分钟 ,它就突然不见了。李老师他们打电话向中国气象局和北京航空航天大学询问这件事。据说对方回答 :“那是不明物体 ,是ＵＦＯ。”李老师记下的目击报告（１９９９年４月１４日…     

空间材料学术会议

空间材料学术研讨会于１９９９年８月２－８月８日在昆明市海欧宾馆召开．参加会议的代表有中国科学院、高校、企业以及军事院校共计５０余人．会议收到论文４７篇，会上交流３４篇．内容包括：人工晶体、金属材料、涂层材料、陶瓷基复合材料的研究与应用．会上郭景坤院士，首次发表了“多相材料”的新概念．此概念模糊了各类材料的界线，而集各类材料之长于一身，但又表现出各自材料的特点．因此这种材料就具有已有材料所不能具有的功能．例如，用各类材料的先进工艺对各类材料进行精细的纳米复合，可以得到一系列新的多相材料．他认为是２…     

努力控制运营成本积极面对高油价——航空公司参与燃料油期货套期保值的必要性

一、受需求因素影响世界原油价格大幅上涨最近,世界石油及航空煤油价格的波动剧烈,价格呈逐步上涨的趋势(见图1),需求量也保持逐年增长的态势(见图2)。2005年的上涨趋势最为猛烈,石油价格一度突破了50美元/桶的水平。石油价格冲击降低石油进口国的经济增长率,甚至降低绝对产出水平造成经济衰退;抬高物价水平,并可能引致通货膨胀。影响油价波动的因素很多,除了供求这两个基本要素外,还有经济因素、政治因素、投机因素、心理预期因素和季节性波动因素等。2005年国际石油价格主要走势是油价波动幅度大,国际大资金炒作痕迹明显。7月底国内航油价…     

机场魅影

2005年9月在大连召开的世界UFO大会闭幕不久,就有人在当地夜空看见一个不明飞行物。此飞行物在半空中飘浮不定,有朦胧的光线。此条消息一经传出,立即出现在大连的各大报纸上。后来经考证,此物为大连服装节上使用的飞艇。此事与十年前的北京机场UFO事件如出一辙。     

我校代表队荣获"2005年全国大学生电子设计竞赛"一等奖

2005年12月17日，我校全国大学生电子设计竞赛获奖学生代表李新钊和指导教师代表贡雪梅，出席了在北京国际会议中心举行的“第七届全国大学生电子设计竞赛颁奖大会”。本次竞赛于2005年9月7日至10日在全国25个省、525所高校中同时进行，全国共有4662个代表队、超过一万名大学生参赛。在荣获全国一等奖的高校中，全国仅有三所高职高专院校代表队获奖，我校是其中之一。陕西赛区共有29所高校、280个代表队报名参加了本次竞赛，最终陕西赛区有6所高校15个代表队获得本次竞赛全国一等奖，我校是其中唯一一所专科学校。     

藏在照相机中的UFO

在2005年3月23日,雷锦超告诉北京UFO研究会秘书长周小强,北京理工大学实验室的郑博士拍摄到UFO图片.拍摄时间是2005年3月22日9时46分～11时16分,共有343幅连续的UFO照片. 3月24日20时30分,周小强、印兆霞、谷庆文一行三人,前往北京理工大学,对郑博士进行了现场采访调查.     

追忆组建中国民航电子计算机系统的经历

在历史的长河中 ,2 0年时间仅仅是短暂的一瞬 ,然而 ,中国民航的电子计算机系统在我国改革开放之后的 2 0年中却走过了从无到有 ,从萌芽到成材的全过程 ,从这里可以看到改革开放为我们的事业带来的翻天覆地的变化 ,略加回忆倍受鼓舞。文革风暴之后 ,1977年中央召开科技工作会议 ,酝酿召开全国科学大会问题 ,当时我任民航局科研处长 ,参加中央科技工作会议之后 ,向沈图局长汇报会议精神 ,针对民航工作的现状 ,谈到如何缩小与国外航空公司在科技方面的差距 ,实现处理业务自动化问题 ,提出将电子计算机技术引入民航业务的设想。沈图同志当即决…     

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.     

Understanding microbialite morphology using a comprehensive suite of three-dimensional analysis tools

Microbialites can have complex morphologies that preserve clues to ancient microbial ecology. However, extracting and interpreting these clues is challenging due to both the complexity of microbial structures and the difficulties of connecting morphology to microbial processes. Fenestrate microbialites from the 2521±3 Ma Gamohaan Formation, South Africa, have intricate structures composed of three distinct microbial structures: steeply dipping supports (surfaces defined by organic inclusions), more shallowly dipping supports with diffuse organic inclusions below them, and draping laminae. In polished slabs, shallowly dipping supports with diffuse organic inclusions show apparent dips from 27° to 60°, and supports without associated zones of diffuse inclusions dip 75° to 88°, which suggests a distinction between support types based on orientation. However, dips exposed in polished slabs are apparent dips, and three-dimensional analysis is required for analysis of true dips. Through the Keck Center for Active Visualization in Earth Sciences (KeckCAVES), we used locally developed software that controls a three-dimensional environment with head and hand tracking (an "immersive environment") to visualize and interpret virtual microbialite data sets. Immersive environments have not penetrated into standard scientific work processes ("workflows") due to their high costs, steep learning curves, and low productivity for users. By contrast, our suite of software tools allowed us to develop a personalized scientific workflow that provides a complete path from initial ideas to characterization of fenestrate microbialites' features. Results of three-dimensional analysis of fenestrate microbialites show that supports with inclusions dip 65° to 75°, whereas supports without inclusions dip 85° to 90°. These results demonstrate that all supports have very steep dips, and a 10° dip gap exists between supports with and without inclusions, which suggests they grew in fundamentally different ways. Results also emphasize how valuable three-dimensional analysis is when combined with a comprehensive workflow for understanding intricate structures such as fenestrate microbialites.     

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.