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Annual business and news:: Beginning the 31st year of the Journal of Guidance, Control, and Dynamics

JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

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BRDF of Salt Pan Regolith Samples

BRDF of Salt Pan Regolith Samples

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Georgi T. Georgiev Charles K. Gatebe James J. Butler Michael D. King Science Systems and Applications Inc. Lanham MD USA Goddard Earth Science and Technology Center University of Maryland Baltimore County Baltimore MD USA Earth Sciences Division NASA Goddard Space Flight Center Greenbelt MD USA Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA

laboratory BRDF measurements of salt pan regolith samples are presented in this study in an effort to understand the role of spatial and spectral variability of the natural biome. The samples were obtained from Etosha Pan, Namibia (19.20degS, 15.93degE, alt. 1100 m). It is shown how the BRDF depends on the measurement geometry - incident and scatter angles and on the sample particle sizes. As a demonstration of the application of the results, airborne BRDF measurements acquired with NASA's Cloud Absorption Radiometer (CAR) over the same general site where the regolith samples were collected are compared with the laboratory results. Good agreement between laboratory measured and field measured BRDF is reported.

关键词： Sea measurements Optical surface waves Laboratories Sea surface Radiometry Land surface Geoscience space technology Extraterrestrial measurements Optical scattering

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LOCAD-PTS: Operation of a new system for microbial monitoring aboard the International space Station (ISS)

LOCAD-PTS: Operation of a new system for microbial monitorin...

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space 2008 Conference

作者： Maule, J. Wainwright, N. Steele, A. Gunter, D. Flores, G. Effinger, M. Damon, M. Wells, M. Williams, S. Morris, H. Monaco, L. Systems Huntsville AL 35806 United States LOCAD-PTS Charles River Laboratories Charleston SC 29407 United States Geophysical Laboratory Carnegie Institution for Science Washington DC 20015 United States LOCAD Group NASA MSFC Huntsville AL 35812 United States Huntsville AL 35806 United States Astronaut Office NASA Johnson Space Center Houston TX 77058 United States Jacobs Technology Inc. Huntsville AL 35806 United States

ISBN: (纸本)9781563479465

Microorganisms within the space stations Salyut, Mir and the International space Station (ISS), have traditionally been monitored with culture-based techniques. These techniques involve growing environmental samples (cabin water, air or surfaces) on agar-type media for several days, followed by visualization of resulting colonies;and return of samples to Earth for ground-based analysis. This approach has provided a wealth of useful data and enhanced our understanding of the microbial ecology within space stations. However, the approach is also limited by the following: i) More than 95% microorganisms in the environment cannot grow on conventional growth media;ii) Significant time lags occur between onboard sampling and colony visualization (3-5 days) and ground-based analysis (as long as several months);iii) Colonies are often difficult to visualize due to condensation within contact slide media plates;and iv) Techniques involve growth of potentially harmful microorganisms, which must then be disposed of safely. This report describes the operation of a new culture-independent technique onboard the ISS for rapid analysis (within minutes) of endotoxin and β-1, 3-glucan, found in the cell walls of gram-negative bacteria and fungi, respectively. This technique involves analysis of environmental samples with the Limulus Amebocyte Lysate (LAL) assay in a handheld device. This handheld device and sampling system is known as the Lab-On-a-Chip Application Development Portable Test System (LOCAD-PTS). A poster will be presented that describes a comparative study between LOCAD-PTS analysis and existing culture-based methods onboard the ISS;together with an exploratory survey of surface endotoxin throughout the ISS. It is concluded that while a general correlation between LOCAD-PTS and traditional culture-based methods should not necessarily be expected, a combinatorial approach can be adopted where both sets of data are used together to generate a more complete story of the mi

关键词： Bacteria

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High-speed solar wind streams: A call for key research

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Eos 2008年第7期89卷 62-62页

作者： Denton, Micheal H. Borovsky, Joseph E. Horne, Richard B. McPherron, Robert L. Morley, Steven K. Tsurutani, Bruce T. Department of Communication Systems Lancaster University Lancaster United Kingdom Space Science and Applications Los Alamos National Laboratory Los Alamos NM United States British Antarctic Survey Cambridge United Kingdom Institute of Geophysics and Planetary Physics University of California Los Angeles CA United States University of Newcastle Newcastle NSW Australia Jet Propulsion Laboratory California Institute of Technology Pasadena CA United States

The arrival of high-speed solar wind streams (HSSs) at the Earth's magnetopause drives particle and wave phenomena that are distinct from the phenomena caused by other solar wind structures. Although HSS events do not generally produce a particularly strong ring current (the current caused by ions and electrons drifting around the Earth), they do produce storm levels of other magnetospheric phenomena (enhanced convection, heating, precipitation, relativistic electron energization, and so forth) that can persist for an extended time period (e.g., many days). These events contrast with interplanetary coronal mass ejection (ICME) events, where more transient driving (e.g., 1 day) is the norm. As such, the energy input to the magnetosphere during HSS events is comparable to, or may exceed, the energy input to the magnetosphere during ICME events.

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Microstructure and Wear Behaviour of Laser-induced Thermite Reaction Al_2O_3 Ceramic Coating on AA7075 Aluminum Alloy

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Journal of Materials science & technology 2007年第2期23卷 201-206页

作者： Kaijin HUANG Xin LIN Changsheng XIE T.M. Yue State Key Laboratory of Plastic Forming Simulation and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Solidification Processing Northwestern Polytechnic University Xi＇an 710072 China Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Hom Hong Kong China

The microstructure and wear behaviour of the thermite reaction coating produced by the hybrid laser claddingremelting on AA7075 aluminum alloy for the systems of Al-CuO-SiO2, Al-Cr2O3-SiO2, Al-Fe2O3-SiO2, and Al-TiO2-SiO2 were studied. The results of the X-ray diffraction （XRD） analysis show that in all the four reaction coatings, α-Al2O3 and γ-Al2O3 phases were present at the top surface, together with various intermetallic phases, the corresponding reduced metal and Al phase in the fusion zone. Under the dry sliding condition, the wear resistance, in terms of weight loss, of the laser-clad specimens was considerably higher than that of the untreated specimen. The predominant wear mechanism of the former specimens was abrasive wear, while for the latter, it was the adhesive wear that prevailed.

关键词： Laser cladding Thermite reaction Aluminum alloy Wear

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Self-adjusting predicted particle swarm optimization

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Journal of Information and Computational science 2007年第2期4卷 483-496页

作者： Cui, Zhihua Zeng, Jianchao Sun, Guoji State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China Division of System Simulation and Computer Application Taiyuan University of Science and Technology Taiyuan 030024 China

Predicted particle swarm optimization is an enhanced version aiming to increase the utilization ratio of velocity information, and the performance heavily relies upon the parameters settings. According to control theory, the trajectories of position and velocity vectors of each particle can be both viewed as oscillatory links, and the relationship between inertia weight and accelerator coefficients is obtained. Thus, a self-adjusting parameter strategy is proposed. simulation results show the new proposed strategy is powerful and useful.

关键词： Numerical methods

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Physical simulation and Experimental Examination of ε-Cu Particles Dissolution Evolution During Welding of Copper Precipitation Strengthening Steel

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Journal of Iron and Steel Research International 2007年第6期14卷 58-62页

作者： WANG Qing-feng SHANG Cheng-jia CHEN Da-wei CAI Jian-wei CHEN Wei-chang State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 Hebei China Department of Materials Physics University of Science and Technology Beijing Beijing 100083 China Dynamic Systems Inc Poestenkill NY12140 USA DSI-YSU Joint Laboratory of Physical Simulation on Materials Processing Yanshan University Qinhuangdao 066004 Hebei China

The kinetics of ε-Cu particles dissolution in the matrix during welding of a copper-precipitation strengthening steel was determined by a combination of GleebleTM physical simulation, TEM examination and hardness meas urement. The ε-Cu particles underwent a coarsening and part dissolution and then complete dissolution reaction as the peak temperature increased from 750 to 1 000℃, which resulted in the decrease in the number density of ε-Cu particles and hardness in the heat affected zone （HAZ）. The results can be used to understand the evolution of this transformation and a softening behavior of the HAZ during welding of this type of steel.

关键词： ε-Cu particle dissolution hardness kinetics steel welding physical simulation

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Verification, validation, and accreditation (VV&A) one voice -?unified, common & cross-cutting

Verification, validation, and accreditation (VV&A) one voice...

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Summer Computer simulation Conference 2007, SCSC 2007, Part of the 2007 Summer simulation Multiconference, SummerSim 2007

作者： Schwartzenburg, Frank Park, Jennifer Stutzman, Marcy Oates, William Johnson, Donald Bailey, Michael Youngblood, Simone Army Model and Simulation Office Alion Science and Technology United States Navy Modeling and Simulation Office VV and A Lead United States Navy Modeling and Simulation Office Northrop Grumman Space and Mission Systems Corp. United States Air Force Agency for Modeling and Simulation M and S Technical Standards United States Air Force Agency for Modeling and Simulation Engineer Systems Solutions United States United States Marine Corps Operations Analysis Division United States Modeling and Simulation Coordination Office Johns Hopkins University Applied Physics Laboratory United States

ISBN: (纸本)9781622763580

This paper establishes support for a unified Verification, Validation, and Accreditation (VV&A) approach to serve as the one "common and cross-cutting" voice for VV&A across the Department of Defense (DoD) and Military Services. Modeling and simulation (M&S) management has been transforming for over a year. Various communities enabled by M&S have been identified at the DoD- and Service-levels. Transforming M&S management has brought about coordination amongst and between the communities to support common services, data, and tools. These common and cross-cutting areas include the standardization of processes, development of best practices, and the utility and application of M&S that together provide overarching benefits to all communities. Currently, M&S management decisions are made by committees through a process of proposals, presentations, and interviews. The VV&A leaders from the DoD, Army, Navy, Air Force, and Marine Corps have collaborated on this paper to reaffirm the need for VV&A by all communities, to identify the need for one voice to speak for VV&A to all communities, and to offer solutions for the road ahead.

关键词： Metadata

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Self-learning particle swarm optimization based on environmental feedback

Self-learning particle swarm optimization based on environme...

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2nd International Conference on Innovative Computing, Information and Control, ICICIC 2007

作者： Cai, Xingjuan Cui, Zhihua Zeng, Jianchao Tan, Ying Division of System Simulation and Computer Application Taiyuan University of Science and Technology Shanxi 030024 China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)0769528821

Particle swarm optimization (PSO) simulates the behaviors of birds ocking and £sh schooling. However, its biological background does not concern the environmental affection. Inspired by the interaction between environment and individuals, a new version - self-learning particle swarm optimization based on environmental feedback (SL-PSO), is proposed, in which two self-learning strategies are designed so that each particle adjusts its moving direction according to the feedback information from the environment. Furthermore, a mutation operator is introduced to avoid premature convergence phenomenon. simulation results show the proposed algorithm is effective and ef£cient. © 2007 IEEE.

关键词： Particle swarm optimization (PSO)

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Particle swarm optimization using Leávy probability distribution

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2nd International Symposium on Intelligence Computation and Applications, ISICA 2007

作者： Cai, Xingjuan Zeng, Jianchao Cui, Zhihua Tan, Ying Division of System Simulation and Computer Application Taiyuan University of Science and Technology Shanxi 030024 China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9783540745808

Velocity threshold is an important parameter to affect the performance of particle swarm optimization. In this paper, a novel velocity threshold automation strategy is proposed by incorporated with Leávy probability distribution. Different from Gaussian and Cauchy distribution, it has an infinite second moment and is likely to generate an offspring that is far away from its parent. Therefore, this method employs a larger capability of the global exploration by providing a large velocity scale for each particle. simulation results show the proposed strategy is effective and efficient. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Optimal systems

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