建筑结构风荷载及其动态响应研究

在过去的几十年里 ,虽然人们对高层建筑风效应的问题已有了一定的了解 ,但对大气流场与结构物各种风致响应的关系机理的认识还有待于进一步提高。确保结构系统在强风期间的安全性与舒适性是一个重要的设计目标。笔者给出了大气边界层模拟要求 ,并介绍了一种研究建筑物的表面脉动压力和高层建筑动态响应的方法。     

Dynamic processes in the outer heliosphere: voyager observations and models

We review recent Voyager 2 observations in the vicinity of 70 AU. The character of the solar wind plasma data between 2002 and 2003 changed to a regime in which the speed, density and magnetic field magnitude are positively correlated. The average speed of the solar wind at Voyager 2 increased between early 2003 and mid-2004, which we attribute to a return of fast coronal hole flow. We use solar wind data at Earth as input to numerical models which include the effect of pickup ions to model the radial evolution of the solar wind. The model reproduces the basic features of the observations. As a specific example, we investigate the propagation of the Halloween (Oct.–Nov.), 2003 storms in the outer heliosphere. The model predictions are in reasonable agreement with Voyager 2 observations.     

基于相关运算的LIDAR测风速

风速测量是激光雷达的应用之一。文中详细讨论了利用相关算法处理激光雷达采集的大气气溶胶回波信号计算风速的方法。介绍大气气溶胶回波信号的前处理，推演便于计算机处理的相关运算计算风速公式，运用Ｍａｔｌａｂ 语言实现信号预处理及风速计算，给出实验结果并与香港天文台数据作比较分析，指出该方法的优点及局限性     

飞机设计中的颤振综合分析

Ｋ８教练飞机设计中的颤振分析包括数值计算、风洞试验、地面试验和飞行试验等工作，这些工作是在飞机设计和制造的不同阶段进行的，且彼此相关密不可分。文中对每一项工作作了评述。指出若仅采用其中的某一项分析或试验表明飞机的颤特性尚有不充分之处。只有将各种分析和试验结果进行相互验证、比较和修正，并进行综合分析，才能得出该飞机颤振安全的正确结论。     

直升机技术在风机惯性载荷计算中的应用

本文根据直升机旋翼惯性载荷的计算方法，导出了风机风轮由于复合运动产生的叶片及轮毂中心惯性载荷的理论计算公式，并以1．3MW风机为例进行了计算，揭示了哥氏惯性力和陀螺力矩对风机载荷产生的影响。     

Martian obstacle and bow shock: origins of boundaries anisotropy

The origin of the anisotropy in the shape of the Martian obstacle and bow shock is analyzed using Mars Global Surveyor observations. The influence of MHD or ion pick-up effects on Martian obstacle position was to be small found, however, localized Martian crustal magnetization increases the thickness of the downstream planetary magnetotail by 500–1000 km in agreement with earlier Phobos 2 observations. A new analytical model is presented for Martian obstacle shape variation for different solar wind ram pressure. Elongation of the Martian BS cross-section in the direction perpendicular to IMF was confirmed while the shift of this cross section in the +Y direction of Martian interplanetary medium reference frame was discovered. The shift of BS cross section in the direction of interplanetary electric field was not revealed thus not conforming the idea that mass-loading play some role in BS control.     

10°尖锥转捩诱导负荷的实验研究

当θｃ＝１０°之尖锥边界层出现转捩流态时，由于背风面与迎风面边界层转捩的不对称性所诱导的气动负荷，包括诱导法向力，诱导俯仰力矩，以及诱导法向力的作用点要随雷诺数而变化，转捩诱导法向力的存在，证实边界层转捩会在物面上诱导出压力增量，即存在着转捩诱导压力。     

APPLICATION OF OPTIMIZATION TO AIRCRAFT LANDING IN WIND SHEAR

 <正> Aircraft landing in wind shear is dangerous. Many accidents have happened and a lot of research work has been done in this area. Whether an aircraft has enough capability to land in wind shear safely or not is not very clear vet. Using the real worst-case wind shear model and the optimization technique, the optima! open loop controls ol two civil aircraft landing in wind shear are found and it can easily be seen thai, generally speaking, an aircraft has potentiality to land in wind shear satelv. The problem hear is how to help the pilot detect the wind shear on board in lime and control the aircraft correctly and timelv.     

RPC-IES: The Ion and Electron Sensor of the Rosetta Plasma Consortium

The ion and electron sensor (IES) is part of the Rosetta Plasma Consortium (RPC). The IES consists of two electrostatic plasma analyzers, one each for ions and electrons, which share a common entrance aperture. Each analyzer covers an energy/charge range from 1 eV/e to 22 keV/e with a resolution of 4%. Electrostatic deflection is used at the entrance aperture to achieve a field of view of 90°× 360° (2.8π sr). Angular resolution is 5°× 22.5° for electrons and 5°× 45° for ions with the sector containing the solar wind being further segmented to 5°× 5°. The three-dimensional plasma distributions obtained by IES will be used to investigate the interaction of the solar wind with asteroids Steins and Lutetia and the coma and nucleus of comet 67P/Churyumov–Gerasimenko (CG). In addition, photoelectron spectra obtained at these bodies will help determine their composition.     

Isotopic Composition of the Solar Wind Inferred from In-Situ Spacecraft Measurements

The Sun is the largest reservoir of matter in the solar system, which formed 4.6 Gyr ago from the protosolar nebula. Data from space missions and theoretical models indicate that the solar wind carries a nearly unfractionated sample of heavy isotopes at energies of about 1 keV/amu from the Sun into interplanetary space. In anticipation of results from the Genesis mission’s solar-wind implanted samples, we revisit solar wind isotopic abundance data from the high-resolution CELIAS/MTOF spectrometer on board SOHO. In particular, we evaluate the isotopic abundance ratios ¹⁵N/¹⁴N, ¹⁷O/¹⁶O, and ¹⁸O/¹⁶O in the solar wind, which are reference values for isotopic fractionation processes during the formation of terrestrial planets as well as for the Galactic chemical evolution. We also give isotopic abundance ratios for He, Ne, Ar, Mg, Si, Ca, and Fe measured in situ in the solar wind.