检索结果-内蒙古大学图书馆

Overview of the South China Sea Monsoon Experiment

Advances in Atmospheric sciences 2004年第3期21卷 343-360页

作者：丁一汇李崇银柳艳菊 National Climate Center China Meteorological Administration Beijing 100081 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 National Climate Center China Meteorological Administration Beijing 100081 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid DynamicsInstitute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029he present paper gives an overview of the key project " South China Sea Monsoon Experiment (SCSMEX)" operated by the Ministry of Science and Technology of China during the period of 1996-2001. The SCSMEX is a joint atmospheric and oceanic field experiment which aims to better understand the onset maintenance and variability of the summer monsoon over the South China Sea (SCS). It is a large-scale international effort with many participating countries and regions cooperatively involved in this experiment. With the field observation in May-August 1998 a large amount of meteorological and oceanic data was acquired which provides excellent datasets for the study of the SCS monsoon and the East Asian monsoon and their interaction with the ocean. The preliminary research achievements are as follows. (1) The earliest onset of the Asian monsoon over the SCS and Indo-China Peninsula has been well documented. Prom the viewpoint of the synoptic process its onset is closely related to the early rapid development of a twin cyclone to the east of Sri Lanka. The conceptual modei of the SCS monsoon onset in 1998 was put forward. The 50-year time series of the SCS monsoon onset date was also made. (2) Two major modes namely the 30-60-day and 10-20-day oscillations were ascertained. The influences of the abnormal SCS monsoon on the precipitation over eastern China and its modes were identifled. A strong (weak) monsoon over the SCS usually leads to less (more) precipitation over the middle and lower reaches of the Yangtze River

The present paper gives an overview of the key project ' South China Sea Monsoon Experiment (SCSMEX)' operated by the Ministry of science and technology of China during the period of 1996-2001. The SCSMEX is a joint atmospheric and oceanic field experiment which aims to better understand the onset, maintenance, and variability of the summer monsoon over the South China Sea (SCS). It is a large-scale international effort with many participating countries and regions cooperatively involved in this experiment. With the field observation in May-August 1998, a large amount of meteorological and oceanic data was acquired, which provides excellent datasets for the study of the SCS monsoon and the East Asian monsoon and their interaction with the ocean. The preliminary research achievements are as follows. (1) The earliest onset of the Asian monsoon over the SCS and Indo-China Peninsula has been well documented. Prom the viewpoint of the synoptic process, its onset is closely related to the early rapid development of a twin cyclone to the east of Sri Lanka. The conceptual modei of the SCS monsoon onset in 1998 was put forward. The 50-year time series of the SCS monsoon onset date was also made. (2) Two major modes, namely the 30-60-day and 10-20-day oscillations were ascertained. The influences of the abnormal SCS monsoon on the precipitation over eastern China and its modes were identifled. A strong (weak) monsoon over the SCS usually leads to less (more) precipitation over the middle and lower reaches of the Yangtze River basin, and more (less) precipitation in North China. (3) During the monsoon onset over the SCS, a wide variety of organized mesoscale convective systems (MCSs) were observed by a Doppler radar array deployed over the northern SCS. The relationship between large-scale circulations and MCSs during the monsoon onset process in 1998 was clearly revealed. It was suggested that there is a kind of positive feedback mechanism between large-scale circulations and

关键词： field experiment South China Sea monsoon low frequency oscillation (LFO) meso scale convective systems (MSCs) air-sea interaction numerical simulation

来源：评论

学校读者我要写书评

暂无评论

Grace: An autonomous robot for the AAAI Robot Challenge

Grace: An autonomous robot for the AAAI Robot Challenge

引用

作者： Simmons, Reid Goldberg, Dani Goode, Adam Montemerlo, Michael Roy, Nicholas Sellner, Brennan Urmson, Chris Schultz, Alan Abramson, Myriam Adams, William Atrash, Amin Bugajska, Magda Coblenz, Michael MacMahon, Matt Perzanowski, Dennis Horswill, Ian Zubek, Robert Kortenkamp, David Milam, Tod Wolfe, Bryn Maxwell, Bruce Robotics and Computer Science Carnegie Mellon University Pittsburgh PA United States Robotics Institute Carnegie Mellon University Pittsburgh PA United States ACT-R Research Group Human-Computer Interaction Institute Carnegie Mellon University Pittsburgh PA United States Carnegie Mellon University Pittsburgh PA United States Carnegie Mellon Robotics Institute Carnegie Mellon University Pittsburgh PA United States Intelligent Systems Section Navy Ctr. Appl. Res. Artif. Intell. Naval Research Laboratory Washington DC United States George Mason University Fairfax VA United States Naval Research Laboratory Washington DC United States Georgia Institute of Technology Atlanta GA United States School of Computer Science Carnegie Mellon University Pittsburgh PA United States Stanford University Austrian Research Institute for AI NASA Johnson Space Center Stanford CA United States Intelligent Multimodal Multimedia G. Navy Ctr. Appl. Res. Artif. Intell. Naval Research Laboratory Washington DC United States

The article discusses an autonomous robot for the AAAI Robot Challenge. In an attempt to solve as much of the AAAI Robot Challenge as possible, five research institutions representing academia, industry and government integrated their research into a single robot named Grace. The article describes the first-year effort by the Grace team, including not only the various techniques each participant brought to Grace but also the difficult integration effort itself.

关键词： Artificial intelligence

来源：评论

学校读者我要写书评

暂无评论

Human systems integration and advanced technology in engineering department workload and manpower reduction

引用

NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

来源：评论

学校读者我要写书评

暂无评论

Polar traverse rover development for Mars, Europa and Earth

Polar traverse rover development for Mars, Europa and Earth

引用

IEEE Conference on Aerospace

作者： A. Behar F. Carsey B. Wilcox Jet Propulsion Laboratory Avionic Systems and Technology Pasadena CA USA Earth & Space Science Division Jet Propulsion Laboratory Pasadena CA USA

The history of Antarctic exploration is filled with traverses for scientific and operational purposes, and they continue to be conducted today. Similarly, traverses are a crucial part of planned planetary science and operations. This paper addresses the proposal for development of an autonomous rover capable of making such extreme environment traverses while accomplishing complex tasks.

关键词： Mars Earth Antarctica Ice Geoscience Humans space technology Aerospace electronics Propulsion Laboratories

来源：评论

学校读者我要写书评

暂无评论

Diagnostic experiments in an arc-heated channel nozzle flow

Diagnostic experiments in an arc-heated channel nozzle flow

引用

10th AIAA/NAL-NASDA-ISAS International space Planes and Hypersonic systems and Technologies Conference 2001

作者： Watanabe, Yasuo Ito, Takeshi Matsuzaki, Takashi Ishida, Kiyomichi Fukui, Toshio Japan Aeronautics and Space Technology Foundation NAL 7-44-1 Jindaiji-higashi Chofu Tokyo 182-8522 Japan National Aerospace Laboratory of Japan Fluid Science Research Center 7-44-1 Jindaiji-higashi Chofu Tokyo 182-8522 Japan National Space Development Agency of Japan NAL Office of Space Transportation Systems 7-44-1 Jindaiji-higashi Chofu Tokyo 182-8522 Japan

The 750kW arc-heated (or arc-jet) wind tunnel is equipped with a channel nozzle to evaluate flat plate TPS materials. TPS materials tests for HOPE-X design data have been made with this channel nozzle, but the flow characteristics of the high enthalpy flow generated in the nozzle have not been well investigated. So, flow diagnostics experiments have been planned. Experimental items included in the plan are emission spectroscopy, mass spectrometry, heat flux measurements, and thermometry and direct surface observations of the test materials. A new calibration module was designed to install instrumentation necessary for the measurements of these items in the channel nozzle test section. Conception of the experiments, design details of the module, and main experimental results are presented. © 2001 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Emission spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Case studies of aircraft contrails using the 1.375-micron channel and IR emission channels on MODIS

Case studies of aircraft contrails using the 1.375-micron ch...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Bo-Cai Gao W.R. Ridgway Rong Rong Li Ping Yang Remote Sensing Division Naval Research Laboratory Inc. Washington D.C. DC USA NASA Goddard Space Flight Center Science Systems and Applications Inc. Greenbelt MD USA Goddard Earth Science and Technology Center NASA''s Goddard Space Flight Center Greenbelt MD USA

The emissions from subsonic jet aircraft flying near the upper tropopause can lead to the formation of condensation trails (contrails). When the relative humidity near the upper troposphere is high, contrails can persist for a long time and embed in ordinary cirrus clouds. In recent years there has been interests in assessing the radiative effects of contrails on the Earth's radiation budget. Imaging data collected with NOAA AVHRR and GOES types of satellite instruments infrequently show aircraft contrails. The 36-channel MODIS instrument on the Terra spacecraft has improved radiometric sensitivities and spatial resolution. It makes the task of contrail detection much easier, particularly with the 1.375-micron cirrus-detecting channel. The authors present examples of contrail observations from MODIS data.

关键词： Aircraft Instruments MODIS Humidity Terrestrial atmosphere Clouds Earth High-resolution imaging Satellite broadcasting space vehicles

来源：评论

学校读者我要写书评

暂无评论

Surf generated aerosols

引用

Journal of Aerosol science 2000年第SUPPL. 1期31卷 S538-S539页

作者： Jensen, D.R. Gathman, S.G. Hooper, W. Space and Naval Warfare Systems Center San Diego Atmospheric Propagation Branch D858 49170 Propagation Path San Diego CA 92152-7385 United States Science and Technology Corp. 101 Research Drive Hampton VA 23666-1340 United States Naval Research Laboratory 4555 Overlook Avenue SW Washington DC 20375-5320 United States

Electrooptical Propagation Assessment in Coastal Environments (EOPACE) is used to quantify and model coastal aerosol effects on infrared propagation. It consists of nine intensive operational periods (IOP) conducted on coastal regions. EOPACE is utilized to determine the impact of surf-generated aerosols on visual and infrared extinction in a coastal environment.

关键词： Atmospheric aerosols

来源：评论

学校读者我要写书评

暂无评论

Extraction of character string region by a correlation method

引用

systems and Computers in Japan 1999年第14期30卷 43-52页

作者： Miyamoto, Kazumasa Tamagawa, Mitsuaki Fujita, Ichiro Hayama, Yasunobu Eiho, Shigeru Electronics R. and D. Department Technical Headquarters MHI Ltd. Kobe 652-8585 Japan Electron. Syst. Space Syst. Eng. D. Kobe Shipyard and Machinery Works MHI Ltd. Kobe 652-8585 Japan Ryomei Engineering Co. Ltd. Hiroshima 733-8553 Japan Department of Systems Science Graduate School of Informatics Kyoto University Kyoto 611-0011 Japan Kyoto University MHI Hiroshima Laboratories MHI System Development Center Kobe System Engineering Center Electronics Technology Department Waseda University MHI IEICE Japan Tokyo Institute of Technology MHI Electronics Syst. Space Syst. E. Kobe Japan Kyushu University Syst. Eng. Research Laboratory Hiroshima Japan Plant System Engineering Center Kobe Japan Technology Training Center Nagoya Japan Ryomei Engineering Co. IEICE Japan JSME ISCIE Japan

This article describes a three-level thresholding method that is used for the preprocessing for searching character-string regions on a natural image, and a method of defining the region by using the correlation process of two kinds of binary images obtainable from the three-level thresholding. Three-level thresholding is a method by which a high-frequency image is obtained by subtracting a moving-average image from the original image and the high-frequency image is changed to an image consisting of three kinds of elements {-1, 0, 1} using the variance of the image. This method is effective when the brightness of characters and their background are not known or fixed at. When the length of a moving average length is sufficiently longer than the width of a character, the three-level thresholding produces an image in which character regions are represented by 1 or -1. The correlation procedure that is made by multiplying pixel values of the two images, one of which is shifted by the width of a line segment of a character, can generate a character region in high probability. A character region is detected by matching of the correlation image with a rectangular template representing the numberplate. The proposed method has been successfully applied to detection of vehicle registration numbers by a roadside camera.

关键词： Optical character recognition

来源：评论

学校读者我要写书评

暂无评论

Stress-assisted transformation in Ti-60 wt pct Ta alloys

引用

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS science 1998年第1期29卷 139-147页

作者： Margevicius, RW Cotton, JD Materials Science and Technology Los Alamos National Laboratory 87545 Los Alamos NM Present address: Los Alamos National Laboratory USA Boeing Information Space and Defense Systems 98124-2499 Seattle WA

An investigation of the influence of processing variables on mechanical properties and phase development for a Ti-60 wt pet Ta (Ti-28.5 at. pet Ta) alloy was conducted. The alloy was hot-rolled, subjected to heat-treatment temperatures above the beta (bcc) transus (I hour at 700 degrees C, 800 degrees C, or 900 degrees C), and water quenched. All heat treatments produced a combination of metastable beta (bcc) and metastable alpha " (orthorhombic martensite), with the amount of retained beta essentially independent of heat treatment, ranging from 20 to 33 vol pet. Deformation of as-rolled and heat-treated tension specimens showed an anomalous leveling of the stress-strain curve in the stress-strain curves at low strains. X-ray diffraction (both simple 2 theta diffractometry and texture analysis) on both deformed and undeformed material determined that the leveling of the stress-strain curve was a result of the beta --> alpha " martensitic transformation. The stress required to initiate the transformation increased with pre-quench temperature. This was determined to be due to the presence of athermal omega. Grain growth kinetics have been determined in the course of this work.

关键词： Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Asynchronous feedback of network capacity for application layer tuning

Asynchronous feedback of network capacity for application la...

引用

MILCOM, Military Communications Conference

作者： B. Rivera M. Humphrey C. Todd Army Research Laboratory Information Science and Technology Directorate Atlanta GA USA Motorola Space and Systems Technology Group Scottsdale AZ USA

The traditional layered network architecture limits the amount of information which is passed between layers of the protocol stack. When data is passed in such a network, it is in the form of a protocol message sent via a service access point (SAP). Because of layer and service access limitations, metrics about network conditions are difficult to pass across multiple layers of the protocol stack. Using this traditional network architecture in high demand, low bandwidth networks can lead to unresolved growth in message latency and subsequent network collapse. This paper presents an asynchronous mechanism that allows various layers of a protocol stack to make informed decisions on the data to be sent based on the current and predicted network performance characteristics. By asynchronous, we mean that intervening layers of the protocol stack are not invoked to pass a message along to the application layer; instead, an external communications mechanism is used to store and hold these metrics. We show how access to data link layer information, such as channel access times, can allow us to tune the application layer performance to more efficiently utilize the available network capacity and prevent network failure. In bandwidth-limited military networks, this efficient use of the physical media, is crucial to winning the information war.

关键词： Access protocols space technology Open loop systems Feedback loop Delay Open systems Bit error rate Communication system control Laboratories Bandwidth

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：