钢-钢筋混凝土结构在高层建筑的应用

随着高层建筑的发展，结构形式也在不断创新，本文介绍了钢-钢筋混凝土混合结构的特点，概述了目前国内外钢-混凝土混合结构的研究进展，预计将在今后的高层建筑中广泛地应用。     

On laboratory simulation and the effect of small temperature oscillations about the freezing point and ice formation on the evaporation rate of water on Mars

We report measurements of the evaporation rate of water under Mars-like conditions (CO2 atmosphere at 7 mbar and approximately 0 degrees C) in which small temperature oscillations about the freezing point repeatedly formed and removed a thin layer of ice. We found that the average evaporation at 2.7 +/- 0.5 degrees C without an ice layer (corrected for the difference in gravity on Earth and on Mars) was 1.24 +/- 0.12 mm/h, while at -2.1 +/- 0.3 degrees C with an ice layer the average evaporation rate was 0.84 +/- 0.08 mm/h. These values are in good agreement with those calculated for the evaporation of liquid water and ice when it is assumed that evaporation only depends on diffusion and buoyancy. Our findings suggest that such differences in evaporation rates are entirely due to the temperature difference and that the ice layer has little effect on evaporation rate. We infer that the formation of thin layers of ice on pools of water on Mars does not significantly increase the stability of water on the surface of Mars.     

An assessment of the impact of radiofrequency interference on microwave SETI searches

Investigations are carried out at JPL on radiofrequency interferences at very low levels (-130 to -180 dBm) in various bands, especially the 1-2 GHz band. Extrapolation of interferences in the years to come is attempted.     

基于软件锁相环的电机速度控制系统

随着电力电子、微电子技术和控制技术的发展，一些场合对电机调速系统性能的要求越来越高，而锁相调速控制在稳速精度方面有其独特的优势。文章在改进的数字锁相环基础上，提出了软件锁相环电机速度控制系统，利用高性能微处理器实现了软件锁相环。     

为中国开发太空探路创中国首飞太空记录 --纪念T-7系列探空火箭首次发射成功45周年

在中国第一个实用探空火箭系列--T-7系列探空火箭首次发射成功45周年之际,回顾了该系列火箭的研制由来和基本情况,论述了该系列火箭对中国开发中层大气和太空所起到的探路作用.     

倾斜转弯导弹耦合通道控制研究

倾斜转弯（BTT）导弹的俯仰与偏航通道之间存在着强烈耦合，使得根据经典控制理论的自动驾驶仪三通道独立设计方法遇到一定困难。基于局部模型跟踪理论，研究了倾斜转弯导弹的耦合控制问题，提出了一种新的自动驾驶仪设计方法，该方法能有效地提高导弹控制精度和快速响应能力。     

Use of the DBM Model to the Predict of Arrival of Coronal Mass Ejections to the Earth

Cosmic Research - This paper analyzes the results of modeling coronal mass ejection (CME) propagation in 2010–2011 obtained using input data from different sources: CME catalogs SEEDS and...     

文化商数对加快首都经济圈建设的研究

文化商数是关于管理和组织心理学范畴的一种理论,它认为理解个体背后的文化背景对于提高商务交流至关重要,同时也是衡量个人成功融入外部环境能力高低的标准。文化商数包括三个组成部分,即认知、行为,以及情绪动机。新制度经济学主张看待和分析经济问题,必须结合制度环境。文化作为一种隐性的机制存在于不同的民族、群体和组织当中。文化商数的提高对于吸引跨国投资,推动区域经济发展并实现首都经济圈建设具有重大意义。     

Calculation of the Direction of the Braking Impulse to Bring a Returnable Stage into the Desired Region

Cosmic Research - The problem of calculating the direction of the braking impulse to bring the reusable returnable first stage of a launch vehicle into the desired landing region is considered. A...     

航天领域常用聚四氟乙烯性能试验研究

聚四氟乙烯因其具有优异的特性,在航天领域有着广泛的应用。文章对SFB-2、M-12、M-111、4FT-6这4种航天领域常用聚四氟乙烯材料的摩擦性能和压缩变形特性进行试验研究:50 N载荷下它们的磨损率分别为1.21×10-4、1.39×10-4、1.32×10-4、1.19×10-6 mm3/(N·m);而13.7 MPa压缩载荷作用下的压缩变形量依次为7.0%、6.1%、3.3%、3.3%。表明不同厂家、不同牌号聚四氟乙烯的摩擦性能和压缩变形特性存在显著差异,在进行产品设计、材料选型时必须因材施用。     

Erratum to: Use of the DBM Model to the Predict of Arrival of Coronal Mass Ejections to the Earth

Cosmic Research - An Erratum to this paper has been published: https://doi.org/10.1134/S0010952521120017     

积极推进产学研结合 不断提高人才的培养质量

本文探讨了高职高专积极推进素质教育，走产学研相结合的道路，加强学生实践能力的培养和实际动手操作能力的提高，改进教学方法和手段，改革办学模式，实现人才从知识型向能力型、创造型转化的途径与机制。     

“环境-1号”A星高光谱成像仪飞行定标

文章针对高光谱成像仪（HSI）,详细介绍了HSI的飞行绝对辐射定标方法,分析了影响HSI飞行定标精度的各种因素。并利用2008年12月6日HSI过河北白洋淀时的同步观测数据验证了定标精度,结果表明绝对定标系数合理可靠。     

体育在培养学生个性心理品质中的作用

良好的个性心理品质是青少年身心健康的重要因素，也是他们成材的物质基础。培养具有个性特长及创造能力的人才是社会发展的需要。实施素质教育是以面向全体学生，全面提高学生的基本素质，注重开发受教育者的潜能，重视学生的个性发展。体育在培养青少年个性心理品质方面具有特殊的功能。体育是对人的素质形成、发展施加积极影响的一种教育，它有利与学生兴趣、爱好、特长的培养和发展，有助于学生建立自尊、自信、自强等心理素质。     

Analysis of the Informativity of the Earth’s Magnetic Field in Near-Earth Space

Cosmic Research - This paper presents the results of a study of the informativity of the anomalies of the modulus and components of the Earth’s magnetic field in near-Earth space in the...     

Subfreezing activity of microorganisms and the potential habitability of Mars' polar regions

The availability of water-ice at the surface in the Mars polar cap and within the top meter of the high-latitude regolith raises the question of whether liquid water can exist there under some circumstances and possibly support the existence of biota. We examine the minimum temperatures at which liquid water can exist at ice grain-dust grain and ice grain-ice grain contacts, the minimum subfreezing temperatures at which terrestrial organisms can grow or multiply, and the maximum temperatures that can occur in martian high-latitude and polar regions, to see if there is overlap. Liquid water can exist at grain contacts above about -20 degrees C. Measurements of growth in organisms isolated from Siberian permafrost indicate growth at -10 degrees C and metabolism at -20 degrees C. Mars polar and high-latitude temperatures rise above -20 degrees C at obliquities greater than ~40 degrees, and under some conditions rise above 0 degrees C. Thus, the environment in the Mars polar regions has overlapped habitable conditions within relatively recent epochs, and Mars appears to be on the edge of being habitable at present. The easy accessibility of the polar surface layer relative to the deep subsurface make these viable locations to search for evidence of life.     

The legacy of the international space year

This article examines the results of International Space Year (ISY). After discussing how and why the idea was conceived, it details the actions taken to bring ISY about and the projects that were to be carried out. The author examines the achievements of the year and how they are likely to continue to influence space policy in the longer term. Successes include the creation - and continuation under another name - of SAFISY; an ongoing willingness among countries and organizations to coordinate their data and avoid wasteful redundancy; a bottom-up approach to global mission planning; and greater public perception of the significance of space.     

Guidance of the Scientific Equipment of the International Space Station to Objects under Study

Cosmic Research - The technology of guiding scientific equipment to objects under study using a steerable platform onboard the Russian segment of the International Space Station (ISS) is presented....     

The Second Stage of BTN Neutron Space Experiment onboard the Russian Section of the International Space Station: the BTN-M2 Instrument

Cosmic Research - As recent studies onboard various spacecraft have shown, one unresolved technical problem of manned interplanetary flights at the moment is the high radiation background of...