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Measurements of ocean wave spectrum from airborne radar at small incidence angles

Acta Oceanologica Sinica 2011年第1期30卷 40-46页

作者： REN Lin PAN Delu MAO Zhihua department of Electromagnetic Fields and Microwave Theory Nanjing University of Science andTechnology Nanjing 210094 China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration Hangzhou 310012 China

This paper proposes the retrieval method of ocean wave spectrum for airborne radar observations at small incidence angles, which is slightly modified from the method developed by Hauser. Firstly, it makes use of integration method to estimate total mean square slope instead of fitting method, which aims to reduce the affects of fluctuations superposed on normalized radar cross-section by integration. Secondly, for eliminating the noise spectrum contained in signal spectrum, the method considers the signal spectrum in certain look direction without any long wave components as the assumed noise spectrum, which would be subtracted from signal spectrum in any look direction for linear wave spectrum retrieval. Estimated v from the integration method are lower than the one from fitting method and have a standard deviation of 0.004 between them approximately. The assumed noise spectrum energy almost has no big variations along with the wave number and is slightly lower to the high wave number part of signal spectrum in any look direction, which follows that the assumption makes sense. The retrieved directional spectra are compared with the buoy records in terms of peak wavelength, peak direction and the significant wave height. Comparisons show that the retrieved peak wavelength and significant wave height are slightly higher than the buoy records but don＇t differs significantly （error less than 10%）. For peak direction, the swell waves in first case basically propagate in the wind direction 6 hours ago and the wind-generated waves in second case also propagate in the wind direction, but the 180° ambiguity remains. Results show that the modified method can carry out the retrieval of directional wave spectrum.

关键词： airborne radar directional wave spectrum retrieval total mean square slope

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The Dynamic Analysis of Slurry Flocculation Process

The Dynamic Analysis of Slurry Flocculation Process

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7th World Congress on Recovery, Recycling and Re-integration

作者： Haixiang Tang department of Safe and environmental engineering, North china Institute Science and Technology, Sanhe, Hebei 065201, china

Owing to the flocculation of floe-forming chemical reagent, the slime is flocculated to lump by three collision contacts as follows: the different direction flocculation, the same direction flocculation and the different velocity settling flocculation. This paper deals with dynamics, and has established flocculating velocity model equations of the same direction flocculation and the different velocity settling flocculation on the basis of analysis on the flocculating process of slurry theoretically. Half-life has been calculated according to these model equations. It may be stated that a good flocculating environment is advantageous to increasing flocculating velocity. A right relative velocity of particles is very important and beneficial to increasing flocculating velocity. The flocculating velocity also concerns the size of particles, the property and amount of flocculating reagent, and so on

关键词： flocculating velocity, half-life, ratio of flocci

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A NONLINEAR GALERKIN METHOD WITH VARIABLEMODES FOR KURAMOTO-SIVASHINSKY EQUATION

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Journal of Computational Mathematics 1999年第3期17卷 243-256页

作者： Yu-jiang wu(Depadrtment of Mathematics, Shanghai University, Jiadiap Shanghai 201800, china department of Mathematics, Lanzhou University, Lanzhou 750000, china) 上海大学数学系上海

This article proposes a kind of nonlinear Galerkin methods with variable modes for the long-term integration of Kuramoto-Sivashinsky equation. It consists of finding an appropriate or best number of modes in the correction of the method. Convergence results and error estimates are derived for this method. Numerical examples show also the efficiency and advantage of our method over the usual nonlinear Galerkin method and the classical Galerkin method.

关键词： Kuramoto-Sivaskinsky equation nonlinear Galerkin method approximation convergence

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基于增强现实的遥现系统研究

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系统仿真学报 2009年第S1期21卷 222-226页

作者：张炯雷小永戴树岭陈娜北京航空航天大学虚拟现实技术与系统国家重点实验室北京100191 北京航空航天大学自动化科学与电气工程学院自动控制系北京100191

传统遥现技术大多利用视频采集传输系统,让用户产生远端临场感,但因为缺少深度信息,很难产生较高的沉浸感,实用价值不高。利用虚拟现实中的增强现实理论,通过双路视频,获取远端场景的深度信息,并将目标对象从视频中提取出来与虚拟场景... 详细信息

传统遥现技术大多利用视频采集传输系统,让用户产生远端临场感,但因为缺少深度信息,很难产生较高的沉浸感,实用价值不高。利用虚拟现实中的增强现实理论,通过双路视频,获取远端场景的深度信息,并将目标对象从视频中提取出来与虚拟场景相结合,搭建一个新型的增强遥现原型系统。系统构建于internet的环境中,重点解决了双路网络视频同步传输,立体视觉深度提取,虚实场景融合三个问题,获得了良好的沉浸感。最后本文以虚拟会议室为研究对象,验证该系统的可行性。

关键词：增强现实遥现立体视觉同步传输

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Reusable Component Technology in the Development of Agile Supply Chain Management System

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厦门大学学报（自然科学版） 2002年第S1期41卷 264-265页

作者： LAI Guo-ming, CHAI Yue-ting, HE Kang-kang, LIU Yi (department of Automation, Tsinghua University, beijing 100084, china)

Agile Supply Chain Management (ASCM) is one of the ke y techniques, which support dynamic enterprise alliance and realize agile manufa cturing. But the optimal run of ASCS depends on a good-constructed Agile Supply Chain Management System (ASCMS), so that the materials flow, information flow a nd funding flow in the supply chain are used with high efficiency. The requireme nts of ASCMS are constantly changeable, which requires that ASCMS has dynamical reuse, integration and open interface. Reusable components theory is one of the most important directions of software engineering. It’s a feasible approach to solve software crisis and to increase software productivity and quality. ASCMS d eveloped with reusable components can easily be re-constructed, and has good op en interfaces. It will also sharply shorten the development life circle of syste m, and avoid unnecessary errors that result from the process of re-developing t hose components. In order to develop ASCMS based on reusable components quickly, the first thing we need to do is to construct the framework for ASCMS called system architecture . The framework referred in this context is not only a reference system of ASCMS , but also the operation system (including run-time library and communication p rotocols), which the ASCMS determined. So we can abstract logic units of the sys tem (they are the logic base of the ASCMS components), and the relationships amo ng them. And the operation system and communication protocols provide these comp onents with a running platform. Of course, the most important thing is to constr uct an abundant components depository. Components in the depository should h ave some properties such as: (1) Components should be built upon a specific oper ation system (e.g., windows) and standard communication protocols (e.g., IIOP in CORBA’s specification); (2)Self-containment, that shows it’s unnecessary to include other components when some component is reused since that component cont ains

关键词： supply chain ASCMS reusable component CORBA

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Finite volume method for investigating anisotropic conductivity in EEG

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Progress in Natural Science:Materials International 2002年第2期 58-62页

作者： XIE Yaoqin, MA Xinshan , GUAN Xin, and CHENG Shaoping( department of Electrical engineering, Tsinghua University, beijing 100084, china Naval Chief Hospital, beijing, 100037, china) department of Electrical engineering Tsinghua University Beijing 100084 China Naval Chief Hospital Beijing 100037 China

A novel finite volume method is presented to investigate the effect of anisotropic conductivity on the potential distribution of the scalp. The second-order interpolation of the tetrahedral mesh is used to avoid employing the secondary element. The calculation precision is enhanced by using the Gaussian integration. To avoid the geometric singularity, the triangular prism is employed in place of the conventional hexahedron mesh. With the method, the spherical models as well as the realistic head models are simulated. The calculation results indicate that the anisotropic ratio and the position of dipole sources have great influence on the potential distribution in the electroencephalogram.

关键词： finite volume method anisotropy electroencephalogram.

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中国成人风湿免疫性疾病患者疫苗接种专家共识(2023版)

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中华预防医学杂志 2024年第1期58卷 1-10页

作者：中国疫苗行业协会免疫规划规范化管理与实践分会长三角免疫规划一体化项目工作组北京白求恩公益基金会吕良敬孙晓冬李佳郭翔不详上海交通大学医学院附属仁济医院风湿科上海200001 上海市疾病预防控制中心上海200336 上海市疾病预防控制中心免疫规划所

疫苗接种是风湿免疫性疾病患者感染防治的重要手段,有助于提高患者生活质量和改善疾病预后,已被纳入风湿免疫人群的医疗决策。中国风湿免疫性疾病患者尚缺乏疫苗接种的临床指南和共识。本专家共识纳入了流感疫苗、肺炎球菌疫苗、新型冠... 详细信息

疫苗接种是风湿免疫性疾病患者感染防治的重要手段,有助于提高患者生活质量和改善疾病预后,已被纳入风湿免疫人群的医疗决策。中国风湿免疫性疾病患者尚缺乏疫苗接种的临床指南和共识。本专家共识纳入了流感疫苗、肺炎球菌疫苗、新型冠状病毒疫苗、带状疱疹疫苗、人乳头瘤病毒疫苗、甲型肝炎疫苗、乙型肝炎疫苗、狂犬病毒疫苗等8种成人常用疫苗,基于现有的临床证据,参考国际同类指南和共识,并最大程度结合了国内疫苗接种的实践经验,以期为广大预防接种人员和风湿免疫科医师提供可操作性强的技术指南,推动中国成人风湿免疫性疾病患者规范化的疫苗接种和感染防治。

关键词：疫苗接种成人风湿免疫性疾病专家共识

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FRACTURE MECHANICS ANALYSIS OF SMART-CUT TECHNOLOGY

FRACTURE MECHANICS ANALYSIS OF SMART-CUT TECHNOLOGY

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中国力学学会学术大会'2005

作者： Feng Xiqiao Xu Mei (department of engineering Mechanics, Tsinghua University, beijing 100084, china)

Smart-Cut is a recently established, advanced technology for fabricating high-quality silicon-on-insulator (SOI) systems and has found various successful applications. It meets almost all the high requirements for processing and manufacturing SOI wafers, which provide the basis of ultra-large-scale integration device structures of modern microeletronic industry. A fundamental study is presented on the basic mechanisms in the Smart-Cut process from the viewpoints of mechanics and physics. First, a model for defect nucleation induced by

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Product Knowledge Representation and integration Technology in Web-based Collaborative Design

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武汉理工大学学报 2006年第S1期28卷 220-227页

作者： HAO Wentao,TIAN Ling,LUO Wei,TONG Bingshu (department of Precision Instruments and Mechanology,Tsinghua University,beijing 100084,china) department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084China

Because of the complexity of modern product design,the web-based collaborative product design aroused considerable attention of manufacturers in the last few years with the development of Internet technology. But it is still hardly achievable due to the difficulty to share product knowledge from different designers and systems. In this paper,we firstly create an ontology-based product model,which consists of PPR (Product,Process and Resource) concept models and PPR characteristic models,to describe product knowledge. Afterwards,how to represent the model in XML is discussed in detail. Then the mechanism of product knowledge collection and integration from different application systems based on interface agents is introduced. At last,a web-based open-architecture product knowledge integrating and sharing prototype system AD-HUB is developed. An example is also given and it shows that the theory discussed in this paper is efficient to represent and integrate product knowledge in web-based collaborative design processes.

关键词： collaborative design knowledge representation ontology interface agent

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Progress in Bio-manufacturing

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Science Foundation in china 2007年第1期15卷 14-19页

作者： Yan Yongnian~(1,2) Wang Xiaohong~(1,2) Xiong Zhuo~(1,2) Liu Haixia~(1,2) Li Shengjie~(1,2) 1 Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Bio- manufacturing engineering, department of Mechanical engineering,Tsinghua University, beijing 100084, P.R. china 2 Institute of Life Science & Medicine, Tsinghua University, beijing 100084, P.R. china Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Bio-manufacturing Engineering Department of Mechanical EngineeringTsinghua University Beijing 100084 P.R. China Institute of Life Science & Medicine Tsinghua University Beijing 100084 P.R. China

In this paper we made a thorough and system- atic expatiation of the definition,connotation and composition of *** on the dif- ferent development stages and process of bioengi- neering,its main research direction and correspond- ing researches were ***,from the viewpoint of disciplinary crossing,integration and development,the main technological develop- ment direction of bio-engineering in the coming years was pointed out.

关键词： bio-manufacturing organ cell assem-bling tissue engineering

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