Heaven on Earth

‘By 2050 we will have probed the universe even further, peeling back time as we strive for some sense of creation and meaning.’ The world's first neurologist in space, Roberta L Bondar , who conducted international experiments on space mission STS 42 and has subsequently undertaken neurological research with NASA, urges us to look up and into space, which is set to remain a rich area of exploration, scientific investigation and wonder, with the discovery of new planets, light, patterns and materials on the not-so-distant horizon.     

支持Web协同的轻量化三维设计框架的研究

计算机支持的协同设计(Computer Supported Cooperative Design,CSCD)是1种分布式的产品设计和开发模式,为用户提供问题讨论和求解的实时协同环境.基于富客户端技术(Rich Internet Applications,RIA)和JT(Jupiter Tessellation)技术,提出了1种面向中小型企业应用、支持Web协同的轻量化三维设计系统框架,并对系统框架以及关键技术进行了详细阐述.基于该框架,中小型企业能够快速部署基于Web的协同环境,并通过轻量化技术完成三维模型的转化,以适应同步协同设计的需要.最后,原型系统验证了轻量化三维设计的有效性,为协同设计领域的应用提供了一定的借鉴意义.     

桑托斯盆地Jupiter油气田富含CO2油气藏形成机制

桑托斯盆地Jupiter油气田油气藏中富含CO₂,气层与油层流体成分存在明显差异,油气藏相态及形成机理没有取得共识。采用四参数方框图法、流体组分三角图、φ₁值、Z₁以及Z₂等多参数法对Jupiter油气藏相态进行综合判识,认为Jupiter油气藏为带油环凝析气藏。油气藏中凝析油与原油具有相似的分子地球化学特征,Pr/Ph比值为1.58~1.88,C₂₆三环萜烷/C₂₅三环萜烷比值为1.15~1.22,甾烷以C₂₇甾烷占优势,藿烷/甾烷比值大于4, TPP比值大于0.5,全油碳同位素在-25‰左右。地球化学参数说明二者来源于白垩系Upper Barremian-Lower Aptian阶湖湘烃源岩。凝析油与原油具有相似的成熟度,均为生烃高峰的产物。烷烃气来自于Upper Barremian-Lower Aptian阶湖湘烃源岩,为生烃高峰——凝析油前期阶段的产物。CO₂为火山幔源型CO₂,大量CO₂后期注入形成的蒸发分馏作用,对早期形成的油气藏进行改造,形成了现今带油环凝析气藏的面貌。地球化学参数证实了蒸发分馏作用的存在,无机CO₂的注入丰富了蒸发分馏作用理论。     

Jupiter Made Abstract,and Then Refined

Journal of Computer Science and Technology - Collaborative text editing systems allow multiple users to concurrently edit the same document, which can be modeled by a replicated list object. In the...     

微型GPS接收机的设计

阐述了以Jupiter OEM板为核心的GPS接收机的软硬件设计,采用芯片SP2339实现了串口的硬件扩展,使用以ST7920为核心控制芯片的12864液晶屏显示接收到的数据,在嵌入式程序中使用单向链表完成数据的存储处理,设计完成的GPS接收机能够快速定位、测量野外站点坐标.     

电能质量分析仪在电梯能耗检验中的应用

JupiterPlus电能质量分析仪是由意大利Elcontrol Energy NetS．p．A．公司生产的计算机辅助检测系统,包括现场测试仪器Jupiter Plus和智能分析软件PQStudio。Jupiter Plus系统能直接测出电梯的用电情况和回馈装置的馈电情况,还可以检测回馈到电网的电能质量问题,如电压波动、频率扰动、谐波／间谐波、电压不平衡、电压中断等多项参数,并可通过曲线图表对测量过程进行显示和分析。     

Römer,Flamsteed, Cassini and the Speed of Light

One of Ole Römer's most influential contributions to astronomy was the theory that light has a finite speed, which he calculated from inequalities in the motion of a satellite of Jupiter. The English astronomer John Flamsteed, first director of the Royal Observatory at Greenwich, is credited with being an early and influential supporter of the theory. This article examines how he came to be so, taking issue with the claim that he was instantly converted to the idea by a personal encounter with Römer. The publication of Flamsteed's Correspondence has made illuminating material newly accessible; through letters it is possible to track the gradual development of his thinking and how it related to his dealings with Römer and with Giovanni Domenico Cassini (director of the Paris Observatory). The resulting account offers new insights into their attempts to share information, in a situation where motives for collaborating were counterbalanced by a potential for rivalry and conflict, and into the interlinked roles played by written correspondence, personal meetings and empirical investigation in the spreading of new ideas.     

A deterministic electron, photon, proton and heavy ion transport suite for the study of the Jovian moon Europa

A Langley research center (LaRC) developed deterministic suite of radiation transport codes describing the propagation of electron, photon, proton and heavy ion in condensed media is used to simulate the exposure from the spectral distribution of the aforementioned particles in the Jovian radiation environment. Based on the measurements by the Galileo probe (1995-2003) heavy ion counter (HIC), the choice of trapped heavy ions is limited to carbon, oxygen and sulfur (COS). The deterministic particle transport suite consists of a coupled electron photon algorithm (CEPTRN) and a coupled light heavy ion algorithm (HZETRN). The primary purpose for the development of the transport suite is to provide a means to the spacecraft design community to rapidly perform numerous repetitive calculations essential for electron, photon, proton and heavy ion exposure assessment in a complex space structure. In this paper, the reference radiation environment of the Galilean satellite Europa is used as a representative boundary condition to show the capabilities of the transport suite. While the transport suite can directly access the output electron and proton spectra of the Jovian environment as generated by the jet propulsion laboratory (JPL) Galileo interim radiation electron (GIRE) model of 2003; for the sake of relevance to the upcoming Europa Jupiter system mission (EJSM), the JPL provided Europa mission fluence spectrum, is used to produce the corresponding depth dose curve in silicon behind a default aluminum shield of 100 mils (∼0.7 g/cm²). The transport suite can also accept a geometry describing ray traced thickness file from a computer aided design (CAD) package and calculate the total ionizing dose (TID) at a specific target point within the interior of the vehicle. In that regard, using a low fidelity CAD model of the Galileo probe generated by the authors, the transport suite was verified versus Monte Carlo (MC) simulation for orbits JOI-J35 of the Galileo probe extended mission. For the upcoming EJSM mission with an expected launch date of 2020, the transport suite is used to compute the depth dose profile for the traditional aluminum silicon as a standard shield target combination, as well as simulating the shielding response of a high charge number (Z) material such as tantalum (Ta). Finally, a shield optimization algorithm is discussed which can guide the instrument designers and fabrication personnel with the choice of graded-Z shield selection and analysis.     

基于uCLinux的嵌入式通讯的设计

介绍了如何在嵌入式操作系统uCLinux上进行嵌入设备通信程序的编写。同时介绍基于JUPITER高效双以太网处理器,并辅以LXT971A为以太网物理层接口的低功耗、高速硬件电路的设计;并实现了嵌入式设备的网络化信息通讯与控制。     

长征运载火箭发射借力木星极轨观日探测器研究

为了实现中国深空探测器能够以对日极轨方式,从黄道外的太阳两极观测日冕爆发与太阳磁场四维活动等,分析了Ulysses探测器的运载发射入轨方案,研究了借力飞越木星引起探测器在太阳系内速度矢量的变化规律,给出了运载火箭入轨速度与木星借力后能够实现的最大黄道夹角理论分析方法,优化了新一代长征运载火箭发射借力木星高纬度观测太阳探测器时,需要的运载火箭新增上面级性能状态,并给出了飞行轨道具体分析算例对比。