High-Definition Television System Onboard Lunar Explorer Kaguya (SELENE) and Imaging of the Moon and the Earth

The High-Definition television (HDTV) system onboard the Japanese lunar explorer Kaguya (SELENE) consists of a telephotographic camera and a wide-angle camera that each have 2.2 M-pixel IT-CCDs (interline transfer charge-coupled devices) and LSIs (large-scale integrated circuits) of the several-million-gates class. One minute-long motion pictures acquired by the HDTV system at 30 fps (frames per second) are recorded in a 1 GB semiconductor memory after compression, and then transmitted to a ground station. In the development of the space-going HDTV system, a commercial ground-model HDTV system was extensively modified and evaluated for its suitability to withstand the harsh environment of space through environmental tests. The HDTV acquired a total of 6.3 TB of movies and still images of the Earth and the Moon over the mission period that started on September 29, 2007, and ended on June 11, 2009. Footage of an “Earth-rise” and an “Earth-set” on the lunar horizon were captured for the first time by the HDTV system. During a lunar eclipse, images of the Earth’s “diamond ring” were acquired for the first time. The CCDs and the instruments used in the system remained in good working order throughout the mission period, despite the harsh space environment, which suggests a potential new approach to the development of instruments for use in space.     

更多测试 更多安全

<正>Agilent U1250系列数字手持式数字万用表的强大功能特性和性能指标超过了客户的预期,能满足客户最苛刻的测量要求和应用需要。     

COUNTERFOIL: a new high security optical surface technology

This paper presents a new optical surface technology known as COUNTERFOIL. The COUNTERFOIL technology provides a means of covert information storage and is used as the basis for a range of security seals and labels. The technology has obtained Australian Government Endorsement (SCEC Endorsement) for use in high security applications. It provides a convenient, low cost means to determine authenticity and detect tampering or surreptitious access     

Training effectiveness evaluation of helicopter emergency relief based on virtual simulation

Helicopters are playing an increasingly important part in emergency relief, such as earthquake rescue, firefighting and medical transport. With the development of virtual simulation technology, virtual simulation-based training is widely used in the training of the helicopter crew especially for the dangerous and costly missions mentioned above. A complete training effectiveness evaluation method is proposed to evaluate the trainees’ training effect based on virtual simulation in this paper. A key to this method is regarding the complicated process as a discrete event-activity flow system and establishing the evaluation indicator system. Then expert group and Analytical Network Process (ANP) are applied to determine the weight of indicators. When the training data are processed, there is a novel attempt to apply Fuzzy Comprehensive Evaluation (FCE) model to calculate the two categories of indicators. Eventually, an experiment and the analysis were carried out to validate the evaluation method.     

The BOSS and BIOMEX space experiments on the EXPOSE-R2 mission: Endurance of the desert cyanobacterium Chroococcidiopsis under simulated space vacuum,Martian atmosphere,UVC radiation and temperature extremes.

The proposed space experiments BOSS (Biofilm Organisms Surfing Space) and BIOMEX (BIOlogy and Mars experiment) will take place on the space exposure facility EXPOSE-R2 on the International Space Station (ISS), which is set to be launched in 2014. In BOSS the hypothesis to be tested is that microorganisms grown as biofilms, hence embedded in self-produced extracellular polymeric substances, are more tolerant to space and Martian conditions compared to their planktonic counterparts. Various microbial biofilms have been developed including those obtained from the cyanobacterium Chroococcidiopsis isolated from hot and cold deserts. The prime objective of BIOMEX is to evaluate to what extent biomolecules are resistant to, and can maintain their stability under, space and Mars-like conditions; therefore a variety of pigments and cell components are under investigation to establish a biosignature data base; e.g. a Raman spectral library to be used for extraterrestrial life biosignatures. The secondary objective of BIOMEX is to investigate the endurance of extremophiles, focusing on their interactions with Lunar and Martian mineral analogues. Ground-based studies are currently being carried out in the framework of EVTs (Experiment Verification Tests) by exposing selected organisms to space and Martian simulations. Results on a desert strain of Chroococcidiopsis obtained from the first set of EVT, e.g. space vacuum, Mars atmosphere, UVC radiation, temperature cycles and extremes, suggested that dried biofilms exhibited an enhanced survival compared to planktonic lifestyle. Moreover the protection provided by a Martian mineral analogue (S-MRS) to the sub-cellular integrities of Chroococcidiopsis against UVC radiation supports the endurance of this cyanobacterium under extraterrestrial conditions and its relevance in the development of life detection strategies.     

Steady and unsteady numerical investigation of transitional shock-boundary-layer-interactions on a fan blade

The present numerical study was performed to investigate the impact of both the Reynolds number variation and the used turbulence model to capture the boundary layer development on the characteristic of a BR710 fan blade. A one-equation model of Spalart Allmaras with an optional semi-empirical transition model of Abu-Ghanam Shaw has been applied. The transition model allows the boundary layer development from a laminar to a turbulent behaviour to be taken into account. This is of particular importance at low Reynolds numbers and thus high operating altitudes of airplanes when the transition location moves further downstream to the trailing edge. Therefore the interaction between the shock waves of the transonic fan blade row and the boundary layer leads to a significant change of the characteristic. The steady numerical studies of the 3-D blade passage have been carried out with the commercial 3-D Navier–Stokes solver NUMECA. Additionally an unsteady calculation has been applied to explain the penalty in efficiency on high operating altitudes.     

基于中性层偏移的Z型材滚弯成形回弹预测

以提高大截面Z型材四轴滚弯成形精度为目的，通过综合考虑材料属性、几何特征和成形半径等因素对回弹的影响，建立了引入中性层偏移的大截面Z型材弯曲回弹解析模型，研究了7075-O和7475-O铝合金Z型材在不同滚弯成形半径下的回弹规律，并进行滚弯成形实验验证。结果表明，与忽略中性层偏移影响的型材回弹预测经验模型相比，基于中性层偏移的回弹预测模型能够准确预测大截面Z型材的回弹量，在相同的曲率半径下，预测回弹变形的最大相对误差从11.681%减小到3.347%。     

Commercial space and international trade rules: an assessment of the WTO''s influence on the sector

This paper explores how the WTO process may affect the development of commercial space industries in Asia. It does so by examining how the ever greater reach of trade rules may constrain industrial and technology policies aimed at developing an indigenous space capability. The role of the USA is also examined, as it is the US industry that will be among the most affected by increased competition in satellite and launcher services.     

烟箱重量在线检测系统的研究

介绍烟箱重量在线检测系统的主要研究内容,概括硬件的结构以及选用的主要设备,阐述上位机软件的主要模块及实现方法。     

面向任务的小卫星自主指令设计

为了提高卫星的安全性、可靠性和可用性,在分析小卫星遥控指令特点的基础上,提出了面向任务的小卫星自主指令设计,把以往多条独立的间接指令组成封装系列指令,星上可以自动判断指令的执行条件,发现指令执行异常时进行处理,从而简化了卫星遥控操作。封装系列指令可以由程控指令以及星上自主产生的事件启动,文章所设计的自主指令已在多颗小卫星上成功应用。