温度传感器的现场动态校准新方法

介绍一种温度传感器的现场动态校准新方法。这种方法是非介入的,并且能校准各种温度传感器。这种方法用斩波调制的激光加热,使传感器产生阶跃温度变化,从而实现动态校准。作为应用实例,文中给出了气流中热敏电阻的动态响应结果。     

通信卫星用先进复合材料天线反射器的分析和实验评价

本文详细介绍了有限元动力学分析法(FEM),用本法来模拟通信卫星复杂的先进复合材材天线反射器的设计,并利用频率、模态形状和动态响应来评价动力学特性。天线反射器对正弦波和燥声引起的响应用与变形、载荷和应力相关的模型来描述。最后的评价包括由所进行的试验中提炼出来的阻尼特性和根据应力分析进行的设计,简要介绍了动力学实验和用实验结果对分析结果进行的校正。     

试验靶场的GPS转发信号跟踪系统方案

本文介绍了基于下述原理的跟踪系统方案,即由试验飞行器转发各GPS卫星信号,而由地面的靶场设备完成信号跟踪和弹道确定。叙述了两种飞行器用的变频转发器,提出了几种修正转发器本振误差的技术,并建议采用IRIG标准遥测设备进行接收、记录和传送转发信号的几种可用技术     

A PREDICTION OF THE VORTEX-RING STATE BOUNDARY BASED ON MODEL TESTS

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THE DIFFUSION BONDING OF Ti－6AI－4V TITANIUM ALLOY UNDER SUPERPLASTIC CONDITION

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LARGE-EDDY SIMULATIONS OF TURBULENT CAVITY FLOWS WITH DYNAMIC SGS MODEL AND LBM ALGORITHM

INTRODUCTIONLarge- eddy simulation ( LES) method is apowerfull tool in numerical simulations of turbu-lence. On the other hand,lattice Boltzmannmethod( LBM) is a new method in computationalfluid dynamics ( CFD) ,especially when used inlarge scale parallel applications.Therefore it isuseful to build the dynamic SGS model intoLBM.In this paper the new method of dynamicSGS model with LBM is described in detail andsome results using the method to numericallysimulate the two and three…     

A NOVEL INTEGRATED OPTICS MIORODISPLACEMENT SENSOR

ＡＮＯＶＥＬＩＮＴＥＧＲＡＴＥＤＯＰＴＩＣＳＭＩＯＲＯＤＩＳＰＬＡＣＥＭＥＮＴＳＥＮＳＯＲ￥ＷａｎｇＨｕｍａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＡｕｔｏｍａｔｉｃＣｏｎｔｒｏｌ，ＮＵＡＡ２９ＹｕｄａｏＳｔｒｅｅｔ，Ｎａｎｊｉｎｇ２１００１６，Ｐ．Ｒ．Ｃｈｉｎ...     

Should the Space Station be an ark?

This essay explores the pros and cons of maximizing the number of species that can be maintained on the Space Station. It reviews some of the history of comparative space biology to show that different cultures have different perspectives on the study of non-traditional research organisms (ie non-rodents) in space. Despite these differences, there are simple principles that all international partners in the Space Station endeavour should be able to uphold when deciding what facilities to build and what species to fly. As an argument for maximizing the taxonomic diversity on the Space Station, examples are given to show how very similar organisms may have different reactions to microgravity. At the same time the political pressure in the USA to make the Space Station an institution specifically servicing the 'health, well-being and economic benefits of people on earth', is acknowledged. Ultimately the justification for what species will be on the Space Station should rest with the quality of the scientific questions being asked.     

Olivine-respiring bacteria isolated from the rock-ice interface in a lava-tube cave, a Mars analog environment

The boundary between ice and basalt on Earth is an analogue for some near-surface environments of Mars. We investigated neutrophilic iron-oxidizing microorganisms from the basalt-ice interface in a lava tube from the Oregon Cascades with perennial ice. One of the isolates (Pseudomonas sp. HerB) can use ferrous iron Fe(II) from the igneous mineral olivine as an electron donor and O(2) as an electron acceptor. The optimum growth temperature is ～12-14°C, but growth also occurs at 5°C. Bicarbonate is a facultative source of carbon. Growth of Pseudomonas sp. HerB as a chemolithotrophic iron oxidizer with olivine as the source of energy is favored in low O(2) conditions (e.g., 1.6% O(2)). Most likely, microbial oxidation of olivine near pH 7 requires low O(2) to offset the abiotic oxidation of iron. The metabolic capabilities of this bacterium would allow it to live in near-surface, icy, volcanic environments of Mars in the present or recent geological past and make this type of physiology a prime candidate in the search for life on Mars.