尼日利亚通信卫星一号失效

北京时间11月11日4点33分.尼日利亚通信卫星一号(尼星一号)因太阳翼故障,电能耗尽,卫星失效。尼星一号项目是中国长城工业总公司在2004年通过国际公开竞标获得的第一个商业卫星在轨交付项目.也是采用东方红四号卫星平台实现的我国整星首次出口。尼星一号于2007年5月14日     

谈如何利用统筹法计算工程量

本文主要针对目前工程量计算过程中存在的问题,介绍了统筹法计算工程量的具体方法,并根据实际需要,给出了主要分项工程量计算顺序及计算公式.     

Introduction to Japanese exploration study to the moon

The Japan Aerospace Exploration Agency (JAXA) views the lunar lander SELENE-2 as the successor to the SELENE mission. In this presentation, the mission objectives of SELENE-2 are shown together with the present design status of the spacecraft. JAXA launched the Kaguya (SELENE) lunar orbiter in September 2007, and the spacecraft observed the Moon and a couple of small satellites using 15 instruments. As the next step in lunar exploration, the lunar lander SELENE-2 is being considered. SELENE-2 will land on the lunar surface and perform in-situ scientific observations, environmental investigations, and research for future lunar utilization including human activity. At the same time, it will demonstrate key technologies for lunar and planetary exploration such as precise and safe landing, surface mobility, and overnight survival. The lander will carry laser altimeters, image sensors, and landing radars for precise and safe landing. Landing legs and a precisely controlled propulsion system will also be developed. A rover is being designed to be able to travel over a wide area and observe featured terrain using scientific instruments. Since some of the instruments require long-term observation on the lunar surface, technology for night survival over more than 2 weeks needs to be considered. The SELENE-2 technologies are expected to be one of the stepping stones towards future Japanese human activities on the moon and to expand the possibilities for deep space science.     

谈如何利用统筹法计算工程量

本文主要针对目前工程量计算过程中存在的问题，介绍了统筹法计算工程量的具体方法，并根据实际需要，给出了主要分项工程量计算顺序及计算公式。     

踏平坎坷不辍探索美将再次发射火星车

由于运行位置的原因，人类发射火星探测器要‘相机行事”。适时发射可以使探测器在飞往火星时既省时，又省力。这样的机会一般每两年多才出现一次。为了加紧探索火星，美国几年前设立了火星勘测者计划，准备每遇一次机会就发射两颗探测器。1996年发射的头两颗探测器——火星探路者和火星全球勘测者（MGS）均顺利抵达目的地。1998年底和1999年初，美又相继发射了火星气候轨道器（MCO）和火星极区着陆器（MP）（统称火星勘测者1998），但这两颗探测器却在最后入轨和着陆的关头相继失踪，引起广人们对美国火星探索计划的强烈批评。在这种情…     

Learning to Reach to Locations Encoded from Imaging Displays

We examined the use of hand gestures while people solved spatial reasoning problem in which they had to infer motion from static diagrams (mental animation problems). In Experiment 1, participants were asked to think aloud while solving mental animation problems. They gestured on more than 90% of problems, and most gestures expressed information about the component motions that was not stated in words. Two further experiments examined whether the gestures functioned in the mechanical inference process, or whether they merely served functions of expressing or communicating the results of this process. In these experiments, we examined the effects of instructions to think aloud, restricting participants' hand motions, and secondary tasks on mental animation performance. Although participants who were instructed to think aloud gestured more than control groups, some gestures occurred even in control conditions. A concurrent spatial tapping task impaired performance on mechanical reasoning, whereas a simple tapping task and restricting hand motions did not. These results indicate that gestures are a natural way of expressing the results of mental animation processes and suggest that spatial working memory and premotor representations are involved in mental animation. They provide no direct evidence that gestures are functional in the thought process itself, but do not rule out a role for overt gestures in this type of spatial thinking.     

重视数学教育有助于开发创造力

论文分别论述了数学对创造力的各构成要素的作用，从而得出数学教育有益于创造力开发的结论，并提出了使数学教育数学化的简单办法。     

重视细节管理 实现持续安全

作为民航空管基层运行单位的一名青年党员,笔者认真研读了李家祥局长关于持续安全理念的一系列重要论述,结合近期学习实践科学发展观的心得体会和安全生产运行实际,谈谈学习实践持续安全理念的一点粗浅体会,以期抛砖引玉．共同为空管系统的安全和发展贡献绵薄之力。     

Spatial approaches to moons from resonance relative to invariant manifolds

In this study, the final approach to a moon or other body from resonance is explored and compared to the invariant manifolds of unstable periodic orbits. It is shown that the stable manifolds of planar Lyapunov orbits can act as a guide for the periods or resonances that are required for the final approach in both the planar and spatial problems. Previously developed techniques for the planar problem are expanded for use with resonances and used for comparison with trajectories approaching a moon from these resonances. A similar technique is then used for exploring the relationship of invariant manifolds to approach trajectories in the spatial problem. It is shown that the invariant manifolds of unstable periodic orbits provide insight into the trajectory design, and they can be used as a guide to the more direct approach trajectories.     

助人自助——心理咨询的真谛

心理咨询的真谛是助人自助，即唤起来访者的自助意识，引导他们通过自我领悟、转换视角、重拾自信及保持平衡等手段从无助走向自助。     

资源1号02B星通过集团公司转正样评审

日前,航天科技集团公司在京组织召开了资源1号02B星转正样评审会。国防科工委系统一司、国家测绘局、国土资源部、资源卫星应用中心、中国空间技术研究院和上海航天技术研究院等单位领导、专家评委们在听取了卫星正样设计方案和测试覆盖性、可靠性分析报告,审阅了相关文件后,一     

Contents to Volume

Volume Contents

Contents to Volume     

霍夫曼：从科学家到航天员再到教授

随着载人航天的进一步拓展，太空科学实验越来越受到重视，而科学家航天员则是承担并执行这些太空科学实验的重要角色。在此，我们就来认识这样一位重要角色，     

如何减少由于空管原因造成的安全差错

引言随着空中交通流量的增加,管制员的工作负荷成几何增大,随之由于空管原因造成的飞行不安全事件时有发生,并成日益增长态势。如何减少由空管原因造成的安全差错成为整个空管行业共同面临的课题。下面笔者就从一线工作者的角度对管制工作中出现安全差错事件的原因做一下简要的分析,然后讨论一下如何在空管一线工作中减少由空管原因造成的安全差错。     

金属半膜橡胶防热层粘接技术研究

对TA1金属半膜的防热层粘接工艺进行了研究,从粘接方案选择、隔热材料选择、胶粘剂选择、粘接试验及试验验证等方面进行了分析与研究。研究表明：9621橡胶可以作为TA1金属半膜的隔热材料,2种材料可以用DG-2环氧胶粘剂进行热硫化粘接。带有防热层的TA1金属半膜可以耐受短时（240s）〈500K的温度,半膜内部的液腔温升几乎为零,有效防护了高温对半膜内部液体的不利影响。     

加强上机实践教学,努力提高学生的实践能力

高等工业专科学校计算机应用专业学生的软件实践能力主要为应用编程能力，而传统的实践教学难以满足提高学生实践能力的要求。文章就如何加强上机实践教学，提高学生实践能力的问题，从上机实现课程设置，实践课与理论课的关系，上机实践课课堂的重点环节以及必要的师资力量和硬件设施配备等方面提出了具体的方案和建议。     

紧密结合地区特点 着力加强体系建设

对“三横三纵”体系中机制建设的几点理解一是运行管理体系建设。民航空管一体化改革后,系统的对外资源也急需进行整合。尤其是地区空管局更是迫切需要尽快和相关单位建立密切的工作联系．以便及时协调解决影响系统正常有序运行的外部制约因素,空管、航空公司、机场间的运行协调决策机制以及军民航协调机制无疑是运行体系建设的重要组成部分。地区空管局要主动谋划区域性机制建设,明确职责．完善制度,发挥区域空管保障中枢作用。