利用k-ε湍流能量闭合方法对城市街渠内[1*9/9]气流结构的模拟

利用非静力、能量闭合的大气边界层模式分别对二维情况下不同高宽比的街渠内部的气流结构和三维情况下城市街渠在来流方向不同的条件下的内部气流结构进行了数值模拟.并且对三维情况下街渠的上风向建筑物顶部的风向与街渠中心近地面的风向之间的关系和街渠内部上层的风向与街渠中心近地面的风向之间的关系进行了模拟研究,将这些结果与G T Johnson等人的现场观测和模式模拟结果进行了比较,表明两者有较好的一致性.     

GaAlAs单模半导体激光器的光谱特性

单模半导体激光器与单模气体激光器相比较,具有自由振荡噪声的特性而显示出(1/f)~(1/2)的相关性。自由振荡激光二极管发射复盖的频率范围为几兆赫,并具有明显的频率不稳定性。当观测到的谱线窄到大约100千赫而使频率稳定度有显著提高时,10~(-7)到10~(-5)量级的弱反馈可提高激光的发射。较强的反馈会引起发射特性的迅速恶化。     

航线客运价格决策分析模型

本文在基本假设的基础上,探讨了航线客运价格决策分析模型,着重研究了两点之间存在多条旅行路线的条件下,旅客对旅行路线的选择行为与旅行路线经营者的决策行为问题。在经营者独立竞争的情况下,文章从被动决策、预期决策等角度建立了均衡过程模型。在旅客行为研究中,本文得出结论,旅客选择旅行路线决定于他的最大价格边际效用。     

PHYSIOLAB: a new laboratory for the study of the cardio-vascular system

On the basis of the experience gained during the previous french-russian missions on board MIR about the adaptation processes of the cardio-vascular system, a new laboratory has been designed. The objective of this “PHYSIOLAB” is to have a better understanding of the mechanisms underlying the changes in the cardio-vascular system, with a special emphasis on the phenomenon of cardio-vascular deconditioning after landing.

Beyond these scientific objectives, it is also intended to use PHYSIOLAB to help in the medical monitoring on-board MIR, during functional tests such as LBNP.

PHYSIOLAB will be set up in MIR by the French cosmonaut during the next french-russian CASSIOPEE mission in 1996. Its architecture is based on a central unit, which controls the experimental protocols, records the results and provides an interface for transmission to the ground via telemetry. Different specific modules are used for the acquisition of various physiological parameters.

This PHYSIOLAB under development for the CASSIOPEE mission should evolve towards a more ambitious laboratory, whose definition would take into account the results obtained with the first version of PHYSIOLAB. This “second generation” laboratory should be developed in the frame of wide international cooperation.     

利用κ—ε湍流能量闭合方法对城市街渠内气流结构的模拟

利用非静力、能量闭合的大气边界层模式分别绎二维情况下不同高宽比的街渠内部的气流结构和三维情况下城市街渠在来流方向不同的条件下的内部气流结构进行了数值模拟。并且对三维情况下街渠的上风向建筑物顶部的风向与街渠中心近地面的风向之间的关系和街渠内部上层的风向与街渠中心近地面的风向之间的关系进行了模拟研究，将这些结果与G T Johnson等人的现场观测和模式模拟结果进行了比较，表明两者有较好的一致性。     

Quantified EEG in different G situations

The electrical activity of the brain (EEG) has been recorded during parabolic flights in trained astronauts and non trained volunteers as well. The Fast Fourier analysis of the EEG activity evidenced more asymmetry between the two brain hemispheres in the subjects who suffered from motion sickness than in the others. However, such a FFT classification does not lead to a discrimination between deterministic and stochastic events. Therefore, a first attempt was made to calculate the dimensionality of "chaotic attractors" in the EEG patterns as a function of the different g-epochs of one parabola. Very preliminary results are given here.     

Lunar astrobiology: a review and suggested laboratory equipment

In October of 2005, the European Space Agency (ESA) and Alcatel Alenia Spazio released a "call to academia for innovative concepts and technologies for lunar exploration." In recent years, interest in lunar exploration has increased in numerous space programs around the globe, and the purpose of our study, in response to the ESA call, was to draw on the expertise of researchers and university students to examine science questions and technologies that could support human astrobiology activity on the Moon. In this mini review, we discuss astrobiology science questions of importance for a human presence on the surface of the Moon and we provide a summary of key instrumentation requirements to support a lunar astrobiology laboratory.