基于分散式RHC算法的无人机编队碰撞避免研究

提出了一种基于滚动时域控制(Receding Horizon control)的,保证无人机编队在飞行过程中满足约束条件并且防撞的分散式控制设计方案.此方法中,每架UAV都可以做出紧急自由碰撞规避机动,以保证冲突避免和约束履行.使用不变集合方法和强制协同的逻辑规则保证了在飞行中UAV之间的碰撞避免.仿真证明,此种分散式RHC方法是有效的.     

Dark matter search with the CALET detector on-board ISS

The CALorimetric Electron Telescope, CALET, mission is proposed for the observation of high-energy electrons and gamma-rays at the Exposed Facility of the Japanese Experiment Module on the International Space Station. The CALET has a capability to observe the electrons (without separation between e⁺ and e⁻) in 1 GeV–10 TeV and the gamma-rays in 20 MeV–several TeV with a high-energy resolution of 2% at 100 GeV, a good angular resolution of 0.06 degree at 100 GeV, and a high proton-rejection power of nearly 10⁶. The CALET has a geometrical factor of 1 m²sr, and the observation period is expected for more than three years. The very precise measurement of electrons enables us to detect a distinctive feature in the energy spectrum caused from WIMP dark matter in the Galactic halo. The excellent energy resolution of CALET, which is much better than GLAST or air Cherenkov telescopes over 10 GeV, enables us to detect gamma-ray lines in the sub-TeV region from WIMP dark matter annihilations. The CALET has, therefore, a unique capability to search for WIMP dark matter by the hybrid observations of electrons and gamma-rays.     

对海作战无人机指挥控制系统发展综述

首先对国外无人机指挥控制系统的发展现状、趋势进行了分析,引出我国对海作战无人机指挥控制系统产品谱系、技术领域发展路线的研究需求,还分析了我国对海作战无人机的作战需求和部署模式,得出不同形态控制站的发展思路和技术路线,同时结合美军无人机指挥控制系统核心能力发展情况,提出我国对海作战无人机指挥控制系统重点技术发展规划,为我国对海作战先进无人机指挥控制装备的研发进行探索。     

Changes in operational procedures to improve spaceflight experiments in plant biology in the European Modular Cultivation System

The microgravity environment aboard orbiting spacecraft has provided a unique laboratory to explore topics in basic plant biology as well as applied research on the use of plants in bioregenerative life support systems. Our group has utilized the European Modular Cultivation System (EMCS) aboard the International Space Station (ISS) to study plant growth, development, tropisms, and gene expression in a series of spaceflight experiments. The most current project performed on the ISS was termed Seedling Growth-1 (SG-1) which builds on the previous TROPI (for tropisms) experiments performed in 2006 and 2010. Major technical and operational changes in SG-1 (launched in March 2013) compared to the TROPI experiments include: (1) improvements in lighting conditions within the EMCS to optimize the environment for phototropism studies, (2) the use of infrared illumination to provide high-quality images of the seedlings, (3) modifications in procedures used in flight to improve the focus and overall quality of the images, and (4) changes in the atmospheric conditions in the EMCS incubator. In SG-1, a novel red-light-based phototropism in roots and hypocotyls of seedlings that was noted in TROPI was confirmed and now can be more precisely characterized based on the improvements in procedures. The lessons learned from sequential experiments in the TROPI hardware provide insights to other researchers developing space experiments in plant biology.     

Improvement of the real time total electron content based on the International Reference Ionosphere model

One of the methods to adapt the International Reference Ionosphere model to real time conditions is to use instantaneous values of the critical frequency of the ionosphere foF2. It is shown that there can be large discrepancies between model and experimental values of the total electron content TEC after this adaptation. Improvement can be provided by the use of an empirical model of the ionospheric slab thickness τ. This conclusion is based on analysis of contributions of various correction factors connected with foF2 and τ into discrepancies between model and experimental values of TEC.     

航空运输业排放权交易研究

首先介绍了排放权交易的起源、概念、经济理论和国际法基础,然后重点总结了欧盟将航空运输活动纳入排放权交易的主要内容,最后,提出了我国民航实施排放权交易需解决的关键问题。     

毫米波国家功率基准及其国际关键比对

文章介绍了一种基于热敏电阻功率座的对称双线结构的矩形波导微量热计的设计和传递标准有效效率计算方法。给出了功率基准热电堆测量曲线及该频段毫米波功率传递标准量值结果。这种新的微量热计将作为我国毫米波功率基准,它将我国的毫米波功率测量能力提高到了75GHz。国际比对是国际多边证书互认的基础,是我国产品进入国际市场准入的质量认证基础,国际关键比对是比对活动中的核心活动。文章介绍了我国参加毫米波WR-22（33GHz-50GHz）国际关键比对情况。     

Global empirical models of the density peak height and of the equivalent scale height for quiet conditions

Monthly average electron density profiles have been calculated from hourly electron density N(h) recorded in 26 digisonde stations distributed worldwide encompassing the time interval 1998–2006. The ionospheric electron density peak height of the F2 region, hmF2, and the effective scale height at the hmF2, Hm, deduced from average profiles have been analyzed to obtain the quiet-time behavior and have been analytically modeled by the spherical harmonic analysis (SH) technique using the modip latitude as the coordinate of the reference system. The coefficients of the SH models of hmF2 and Hm are bounded to the solar activity, and the temporal and seasonal variations are considered by Fourier expansion of the coefficients. The SH models provide a tool to predict hmF2 and Hm located anywhere in the range of latitudes between of 70°N and 70°S and at any time. The SH analytical model for hmF2 improves the fit to the observations by 10% in average compared to the IRI prediction, and it might improve the IRI prediction of hmF2 by more than 30% at high and low latitudes. The analytical model for Hm predicts the quiet behavior of the effective scale height with accuracy better than 15% in average which enables to obtain a good estimation of vertical profiles. These results could be useful to estimate information for the topside profile formulation.     

European space research in support of international partnership

The envisaged future space research programmes, whether in the field of space exploration or Earth observation are becoming more and more technically complicated and so costly that a single nation can hardly afford to realize them. Major non-European space-faring nations, China and India will progressively play an important role besides US, Russia and Japan. The Space Advisory Group of the European Commission recommended that the European Commission supports within Horizon 2020 a comprehensive Robotic Mars-Exploration Programme under European leadership that should become an essential element of a coordinated international space research programme. The International Space Station (ISS) experience shows that cooperative space programmes build links between industries and laboratories from around the world, which then further develop in non-space related activities, with positive impact on the economy and scientific research. Strategies need to be developed to mitigate the gradual increasing risks incurred by climate change. In order to lower their entry barrier to engage in space emerging and developing space nations need to be included in cooperative space programmes. We present the recommendations of the Space Advisory Group of the European Commission concerning Europe's participation to global space endeavours.     

论股份合作制企业的劳动法律关系

本文结合股份合作制企业的特点,系统的分析了股份合作制企业的劳动法律关系的特殊性和这些特殊性产生的根源.文章对实践中股份合作制企业在处理劳动关系的过程中经常出现的问题进行了分析,并且提出了解决问题的建议和思考.