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⊙第51篇⊙

Study on Hydrothermal Cracking of Heavy Oils: Formation of Radical Under Lower Reaction Temperature
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注意:本論文已在Anal. Rep. Eng. Res. Inst. Facul. Eng. Univ. Tokyo, vol.59, pp.111發表
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Jie CHANG(常杰), Noritatsu TSUBAKI and Kaoru FUJIMOTO

SYNOPSIS

   The hydrothermal cracking of heavy oils, Canadian oil sand bitumen and Arabian heavy vacuum resid, as well as their model compound were performed over Ni/Al2O3 and NiMo/Al2O3 catalysts under 663-703 K and 5.0 MPa of hydrogen pressure in a autoclave reactor. The conversions of heavy oils and their model compound were remarkably enhanced by adding some free radical initiators, such as peroxide and sulfur. The reaction mechanism on model compound, 1-phenyldodecane (PhDD), suggested that the hydrogen in hydrocarbon was easily abstracted by free radicals that were formed from initiators under lower temperature, and the chain reactions were readily initiated. Therefore, the conversion was obviously increased even at lower reaction temperature.


⊙第52篇⊙

Hydrothermal cracking of Residual Oil
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注意:本論文已在Acta Petrolei Sinica (Petroleum Processing Section), Vol.17 (1), pp.42發表
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Kaoru Fujimoto, Jie Chang(常杰) and Li Fan
Department of Applied Chemistry, School of Engineering, The University of Tokyo,
Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-8656, Japan

Abstract:Hydrothermal cracking process of residual oil has been developed by our group for many years to upgrade heavy oil feedstock into valuable middle distillate products. It is a tailor-made combined process of thermal cracking and catalytic hydrogenation. This process can suppress gas and toluene insoluble coke yields and promote middle distillate yield comparing with thermal cracking process at the same conversion level. Hydrothermal cracking process was operated at high reaction temperature (693~733 K) and medium hydrogen partial pressure (3.0~8.0 MPa). Experiments were conducted in batch autoclave reactors and semi-batch reaction systems respectively. Series of catalysts were prepared from different supports (MgO, active carbon, SiO2 and Al2O3) and active metals ( Ni, Mo, Co and W, etc.). Feedstock such as bitumen, AR (atmospheric resid) and VR (vacuum resid) were tested. The structure of feedstock and products were characterized by 1H-NMR. The reuse ability and regeneration of catalysts were studied as well. Alumina-supported catalysts showed better performance and regeneration ability. The reaction mechanism of hydrothermal cracking was also studied by model compound and proposed as one consisting of thermal cracking of hydrocarbon molecules via free radical chain reactions and catalytic quench of free radicals by hydrogen.


⊙第53篇⊙

Free-surface waves and far wakes generated by a floating body in a viscous fluid. Journal of Hydrodynamics
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注意:本論文已在. Journal of Hydrodynamics, Ser. B, Vol. 15, No. 4, pp.10-16. Aug. 2003.發表
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Lu Dong-qiang.(盧東強)
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
Shanghai institute of Applied Mathematics and Mechanics, Shanghai University, Shagnhai, 200072, China 

Abstract: The free-surface waves and the flow field due to a body moving on the surface of an incompressible viscous fluid of infinite depth were studied analytically. The floating body was modeled as a normal point pressure on the free surface. Based on the Oseen approximation for governing equations and the linearity assumption for boundary conditions, the exact solutions in integral form for the free-surface elevation, the velocities and the pressure were given. By employing Lighthill's two-stage scheme, the asymptotic representations in far field for large Reynolds numbers were derived explicitly. The effect of viscosity on the wave profiles was expressed by an exponential decay factor, which removes the singular behavior predicted by the potential theory.
Keywords: free-surface waves, velocity distribution, floating body, viscosity, asymptotic representation, Lighthill's two-stage scheme


⊙第54篇⊙

非線性水波Hamilton系統理論與應用研究進展
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注意:本論文已在力學進展》 284,521-531, 199811發表
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張寶善, 盧東強, 戴世強, 程友良
(上海大學,上海市應用數學和力學研究所,上海,200072)

摘要: 概述了辛幾何理論與辛算法在Hamilton力學中的應用,綜述非線性水波的Hamilton理論研究進展。闡述非線性水波Hamilton變分原理與方法的優越性與局限性,探討KdV方程和BBM方程的Hamilton描述、對稱性與守恒律。提出非線性水波Hamilton描述研究中有待進一步研究的問題和解法設想。
關鍵詞: Hamilton變分原理,辛幾何,非線性水波,Hamilton系統,對稱性與守恒律

Research progress on theories and applications of Hamiltonian system in nonlinear water waves 

Zhang Baoshan, Lu Dongqiang, Dai Shiqiang, Cheng Youliang
(Shanghai Institute of Applied Mathematics & Mechanics, Shanghai University, Shanghai, China, 200072)

Abstract: This paper is a summary of the applications of symplectic theories algorithms to Hamiltonian mechanics and the research progress Hamiltonian formulation for nonlinear water waves. The advantages and limitations of Hamiltonian variational principle and approaches for nonlinear water waves are discussed. In addition, it includes also discussions on the Hamiltonian formalism, symmetry and conservation laws of KdV equation and BBM equation and comments on the problems concerned.
Keywords: Hamiltonian principle, symplectic geometry, nonlinear water waves, Hamiltonian systems, symmetry and conservation laws.


⊙第55篇⊙

新型Poisson 括號意義下的無窮維Lie代數
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注意:本論文已在力學學報》 1998年30卷3期,307-313頁, 1998年5月發表
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張寶善, 盧東強, 戴世強
(上海大學,上海市應用數學和力學研究所,上海,200072)

摘要: 本文首先針對DdV方程的Hamilton形式,建立一種比較容易驗證的新型Poisson括號和無窮維Lie代數。其次,研究KdV方程的Hamilton形式的第一積分與新型Poisson括號的關系,得到判定第一積分的充分必要條件。最后,構造KdV方程的第一積分。
關鍵詞: KdV方程,Hamilton形式,第一積分,Poisson括號,無窮維Lie代數

Infinite-Dimensional Lie Algebra With a New Poisson Bracket 

Zhang Baoshan, Lu Dongqiang, Dai Shiqiang
(Shanghai Institute of Applied Mathematics & Mechanics, Shanghai University, Shanghai, China, 200072)
 

Abstract: For the  Hamiltonian formulation of the Korteweg-de Vires equation (KdV equation), C.S. Gardner defined a Poisson bracket. In this paper a brand-new bracket is defined. It is easily verified that new bracket possesses three properties of the Poisson bracket, bilinearity, skew symmetry, Jacobi identity. The new Poisson bracket has a close connection with C.S. Gardner's definition. In the framework of the new Poisson bracket, all the first integrals of the KdV equation constitute an infinite-dimensional Lie algebra. Then the necessary and sufficient conditions for identifying the first integrals are obtained. Finally, the method for finding first integrals of  KdV equation is investigated.
Keywords: KdV equation, Hamiltonian formulation, first integral, Poisson bracket, infinite-dimensional, Lie algebra..


⊙第56篇⊙

計算機輔助創新概念設計方法研究
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注意:本論文已在Proceedings of the 5th International Conference on Frontiers of Design and Manufacturing (ICFDM'2002)》發表
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(ISTP收錄本文)

賴朝安 孫延明 黃平 鄭時雄
(華南理工大學 機械工程學院 廣州 510640)

摘 要: 依據多級菱形思維模型,分析基于實例的推理、遺傳算法的不足并指出其深層原因是不符合多級菱形思維模型。提出引入聚類分析方法,用實例檢索、聚類分析與遺傳算法優化模擬多級菱形思維過程。通過減少從用戶需求到產品結構的映射次數以保證第一次收斂的效果,定義產品結構相似性并推導出相似度計算公式以實現聚類分析,并依此改進實例檢索效果與遺傳算法性能來促進創新設計。
關鍵詞:創新設計;基于實例的推理(CBR);聚類分析(CA);遺傳算法(GA)
中圖分類號:TH122 文獻標識碼:A

RESEARCH ON COMPUTER–AIDED CREATIVE CONCEPTUAL DESIGN METHOD 

LAI Chaoan, SUN Yanming,  HUANG Ping, ZHENG Shixiong
Institute of Mechanical Engineering, South China University of Technology, Post Code 510640

ABSTRACT:According to the model of multilevel rhombus thought (MRT), the drawbacks in CBR and GA were analyzed and it was pointed out that the fundamental reason to their drawbacks was their deviating from the model of MRT. Cluster analysis method was applied with a view to bind CBR, cluster analysis and GA together to simulate a MRT process. It was pointed out that mapping times from customer needs to physical structure should be reduced in order to guarantee the effect of first convergence. The definition of similarity and the arithmetic formula of similarity measure for physical structure were put forth in order to carry out cluster analysis. Above method improves the effect of case retrieval and the performance of GA and aid in the design of creative artifacts. 
Keywords: Creative designing; Case-Based Reasoning (CBR); Cluster analysis; Genetic Algorithms (GA)


⊙第57篇⊙

Multiple travelling wave solutions of nonlinear evolution equations using a unified algebraic method
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注意:本論文已在 JOURNAL OF PHYSICS A: MATHEMATICAL AND GENERAL 35 (2002) 6853–6872 》發表
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(SCI收錄本文)
Engui Fan(范恩貴)
Institute of Mathematics, Key Laboratory for Nonlinear Mathematical Models and Methods,
Fudan University, Shanghai 200433, People’s Republic of China

AbstractA new direct and unified algebraic method for constructing multiple travelling wave solutions of general nonlinear evolution equations is presented and implemented in a computer algebraic system. Compared with most of the existing tanhmethods, the Jacobi elliptic functionmethod or other sophisticated methods, the proposed method not only gives new and more general solutions, but also provides a guideline to classify the various types of the travelling wave solutions according to the values of some parameters. The solutions obtained in this paper include (a) kink-shaped and bell-shaped soliton solutions, (b) rational solutions, (c) triangular periodic solutions and (d) Jacobi and Weierstrass doubly periodic wave solutions. Among them, the Jacobi elliptic periodic wave solutions exactly degenerate to the soliton solutions at a certain limit condition. The efficiency of the method can be demonstrated on a large variety of nonlinear evolution equations such as those considered in this paper, KdV–MKdV, Ito’s fifth MKdV, Hirota, Nizhnik–Novikov–Veselov, Broer–Kaup, generalized coupledHirota–Satsuma, coupled Schr¨odinger–KdV, (2 + 1)-dimensional dispersive long wave, (2 + 1)-dimensional Davey– Stewartson equations. In addition, as an illustrative sample, the properties of the soliton solutions and Jacobi doubly periodic solutions for the Hirota equation are shown by some figures. The links among our proposed method, the tanh method, extended tanh method and the Jacobi elliptic function method are clarified generally.


⊙第58篇⊙

A family of completely integrable multi-Hamiltonian systems explicitly related to some celebrated equations
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注意:本論文已在JOURNAL OF MATHEMATICAL PHYSICS VOLUME 42, NUMBER 9 SEPTEMBER 2001:4327-4344》發表
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(SCI收錄本文)
Engui Fan(范恩貴)
Institute of Mathematics, Fudan University, Shanghai 200433, People’s Republic of China

~Received 2 October 2000; accepted for publication 4 June 2001

By introducing a spectral problem with an arbitrary parameter, we derive a Kaup–Newell-type hierarchy of nonlinear evolution equations, which is explicitly related to many important equations such as the Kundu equation, the Kaup–Newell ~KN! equation, the Chen–Lee–Liu ~CLL! equation, the Gerdjikov–Ivanov ~GI! equation,the Burgers equation, the modified Korteweg-deVries ~MKdV! equation and the Sharma–Tasso–Olver equation. It is shown that the hierarchy is integrable in Liouville’s sense and possesses multi-Hamiltonian structure. Under the Bargann constraint between the potentials and the eigenfunctions, the spectral problem is nonlinearized as a finite-dimensional completely integrable Hamiltonian system. The involutive representation of the solutions for the  Kaup–Newell-type hierarchy is also presented. In addition, an N-fold Darboux transformation of the Kundu equation is constructed with the help of its Lax pairs and a reduction technique. According to the Darboux transformation, the solutions of the Kundu equation is reduced to solving a linear algebraic system and two first-order ordinary differential equations. It is found that the KN, CLL, and GI equations can be described by a Kundu-type derivative nonlinear Schro¨dinger equation involving a parameter. And then, we can construct the Hamiltonian formulations, Lax pairs and N-fold Darboux transformations for the Kundu, KN, CLL, and GI equations in explicit and unified ways.


⊙第59篇⊙

三維邊坡穩定性極限平衡分析系統軟件SLOPE^3D的設計及應用
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注意:本論文已在巖石力學與工程學報.2003,22(7):1121-1125 》發表
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姜清輝 ,2 王笑海2 豐定祥2 馮樹仁2 
(1.武漢大學水力發電工程系 武漢430072;2.中國科學院武漢巖土力學研究所 武漢 430071)

摘要: 為了拓展三維極限平衡法在實際工程中的廣泛應用,邊坡穩定性分析可視化系統軟件3D_SLOPE被研制和發展。它由前處理、極限平衡分析求解器和后處理組成,前處理核心是構造三維邊坡地質模型,后處理主要是計算結果分析和可視化圖形顯示。該系統將邊坡工程地質信息三維可視化技術和穩定性分析有機地結合起來,由于其良好的用戶界面和高質量的三維圖形顯示能力,人們能夠容易地將其應用到實際邊坡工程問題。
關鍵詞: 邊坡穩定性分析 ,極限平衡法 ,三維可視化 

Three Dimensional Limit Equilibrium Analysis System Software 3D_SLOPE
for Slope Stability and its Application


Jiang Qinghui1 Wang Xiaohai2 Feng Dingxiang2 Feng Shuren2
(1College of Water Conservancy and Hydropower Engineering, Wuhan University,430072,China)
(2 Institute of Rock and Soil Mechanics, The Chinese Academy of Sciences, Wuhan 430071)

Abstract In order to pursue three-dimensional limit equilibrium analysis methods to widely practical applications, an interactive visualization system software 3D_SLOPE for slope stability analysis has been developed. It contains the pre-processor, the limit equilibrium analysis solver and the post-processor. In the pre-processor, the construction of three-dimensional geological model of the slope structure provides geoinformation presentation for the limit equilibrium solver. In the post-processor, the effective three-dimensional visualization of data sets can assist the user with interpretation and analysis of the calculation results. The 3D_SLOPE system combined 3-D visualization of geoinformation in slope engineering with limit equilibrium analysis for slope stability. Because of its user-friendly interface and high-quality 3-D graphics capabilities, the geotechnical engineers can easily apply 3D_SLOPE to practical engineering problems. 
Key Words analysis of slope stability, limit equilibrium method, three-dimensional visualization


⊙第60篇⊙

A Model of Point-to-Face Contact for Three-Dimensional Discontinuous Deformation Analysis
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注意:本論文已在Rock Mechanics and Rock Engineering. August 18, 2003 # Springer-Verlag》發表
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Q. H. Jiang1(姜清輝) and M. R. Yeung2
1State Key Laboratory of Water Resources and Hydropower Engineering Science
Wuhan University, Wuhan, P.R. China
2Department of Civil Engineering, The University of Hong Kong, Hong Kong, P.R. China

Received August 30, 2002; accepted April 7, 2003

Summary:The key to three-dimensional discontinuous deformation analysis (3D DDA) is a rigorous contact theory that governs the interaction of many three-dimensional blocks. This theory must provide algorithms to judge contact types and locations and the appropriate state of each contact, which can be open, sliding or locked. This paper presents a point-to-face contact model, which forms a part of the contact theory, to be used in 3D DDA. Normal spring, shear spring and frictional force submatrices are derived by vector analysis and the penalty method. Also given are the ‘‘openclose’’ iteration criteria and operations performed for different changes in contact state. Sliding at a contact can occur in any direction parallel to the contact face, as opposed to one of two directions in two-dimensional DDA. This point-to-face contact model has been implemented into a 3D DDA computer program, and numerical results from several test cases demonstrate the validity of the model and the capability of the program.
Keywords: 3D DDA, point-to-face contact, open-close iteration.


⊙第61篇⊙

Dosing system for the nanolitre range,fabricated with the AMANDA process
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注意:本論文已在
JOURNAL OF MICROMECHANICS AND MICROENGINEERING. 13 (2003) S85–S90》發表
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P Shao(邵培革), Z Rummler and WK Schomburg
Forschungszentrum Karlsruhe, Institut f¨ur Mikrostrukturtechnik, Postfach 3640,D-76021 Karlsruhe, Germany

Abstract:We present a dosing system, which consists of four microvalves (presented by Rogge et al in the Proceedings of Eurosensors XVI, Prague, 2002,pp 109–110) for controlling and a movable membrane for flow measurement that divides a cavity into two chambers. The flow rate is determined from the straining of the membrane caused by the entering fluid. The displaced volume is detected by strain gauges integrated in the membrane. The overall dimensions of the membrane and the entire system are 2 mm and 10 × 50 × 6 mm3, respectively. A simple control was coded for dosing a certain amount of volume. This simple system has already achieved an accuracy of about 10%. The dosing system is manufactured with the AMANDA process, which allows for low-cost production of microcomponents from polymers.


⊙第62篇⊙

Polymer micro piezo valve with a small dead volume
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注意:本論文已在INSTITUTE OF PHYSICS PUBLISHING JOURNAL OF MICROMECHANICS AND MICROENGINEERING. 14 (2004) 305–309》發表
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Peige Shao1(邵培革), Zeno Rummler2 and Werner Karl Schomburg3
Forschungszentrum Karlsruhe, Institut f¨ur Mikrostrukturtechnik, Postfach 3640, D-76021,Karlsruhe, Germany

Abstract:A polymer valve with a small dead volume in the range of 6 nl and a response time faster than 1 ms is presented. The valve structure is simple and therefore easy to fabricate by injection molding or hot embossing. A layer of silicone rubber applied by a stamping technique not only promotes the sealing of the valve but also defines the gluing area during assembly. The fabrication is based on the AMANDA-process, which allows low-cost batch production of polymer micro devices. 


⊙第63篇⊙

溜冰機器人運動學分析
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注意:本論文已在上海交通大學學報》2002,36 (9):1365-1369發表
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宋立博, 呂恬生, 張家梁, 費燕瓊
(上海交通大學機械工程學院,上海,200030)

摘要:依據Roller-walker和ALDURO重新設計了采用腿輪混合結構的溜冰機器人。在簡要介紹常規的運動學分析方法的基礎上,建立了相關的慣性坐標系和滾輪坐標系,并根據滾輪在法向無滑動、切向作純滾動的假設建立了中心定位輪的運動約束方程。然后,建立了機器人的運動學模型,并討論了機器人的移動性問題,得出機器人存在運動的條件。同時,設計了溜冰機器人運動學狀態空間表達式。最后,以溜冰機器人為例分析了其轉彎和直線滑行時的運動學問題。
關鍵詞 溜冰機器人,移動機器人,運動學,狀態空間
中圖分類號: TP242.1 文獻標識碼 A

Kinematic Analysis of Ice-Skater Robot

SONG Li-bo LÜ Tian-sheng ZHANG Jia-liang FEI Yan-qiong
(School of Mechanical Engineering of Shanghai Jiao Tong University,Shanghai,200030)

ABSTRACT A Ice-skater Robot of leg-wheel type is redesigned according to Roller-walker and ALDURO. On the basis of introduction of kinematic analysis methods, the paper founds the stationary coordinate system and the wheel coordinate system respectively. Meanwhile, the kinematic constraint equations of the standard centered orientable wheel is founded on the assumption that there is no slippage in normal direction and pure rolling in tangential direction of the wheels. Then, the kinematic model is modeled and the mobility is discussed in the paper. And the motion condition equation of the robot is gotten in sequence. Meanwhile, the paper designs the kinematic state space representation of the Ice-skater Robot. At last, the paper analyzes the kinematics of the Ice-skater Robot when it turns and skates forwards respectively. 
KEYWORDS Ice-skater Robot,Mobile robot,,Kinematics,State space 


⊙第64篇⊙

The core doninance parameter of extragalactic radio sources
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注意:本論文已在Asronomy & Astrophysics June 11, 2003,1–14》發表
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J.H. Fan and J.S. Zhang
Certer for Astrophysics, Guangzhou University, Guangzhou, 510400, China

Abstract: In this paper, based on a paper by Liu Zhang(2002), we have chosen a sample of 542 extragalactic sources, for which we have calculated the core-dominance parameters and investigated the relation between core-dominance parameter and the core and extended luminosities. The core-dominance parameter of galaxies is smaller than that in quasars, which is smaller than that in BL Lac objects.
Key words BL Lacertae objects; general, galaxies; quasars-galaxies; Seyfert-galaxies; jet 


⊙第65篇⊙

基于小波變換和模糊算法的醫學圖像的邊緣檢測算法
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注意:本論文已在《大連理工大學學報》Vol.42,No.4.2002:504-508發表
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袁野1.2 歐宗瑛2
(1.大連理工大學自動化系,大連,116024 2.大連理工大學機械系CAD&CG研究所,大連,116024)

摘要:在醫學圖像三維顯示技術中,需要得到單象素級的清晰輪廓線。為了適應這種需求,本文提出了一種邊緣檢測算法,它基于Mallat小波模極大值邊緣檢測方法,同時應用模糊數學的原理為模極大值構造相應的隸屬函數,對得到的極大值進行進一步篩選,最終可以得到單象素級的邊緣。實驗結果證明了該算法的可行性。
關鍵字:小波變換,邊緣檢測,模極大值,隸屬函數,模糊算法

A Method of Edge Detection Based on Wavelet Transform and Fuzzy Algorithm

Yuan Ye 1.2 Zhong Chongquan2 Ou Zongying 2
1Automation Department, Dalian University of Technology, Dalian, 116024
2CAD&CG lab, Mechanical Engineering Department, Dalian University of Technology, Dalian, 116024

Abstract: In 3D render technique of medical images, we need edges which are single pixel. In order to meet this need, we proposed a method of edge detection, which based on Mallat wavelet model maximum edge detection algorithm and fuzzy algorithm. We designed a membership function for model maximum and pick suitable model maximum , then the edge of single pixel can be detected. The experimental results show that the algorithm is feasible.
Keyword
s: wavelet transform, edge detection, model maximum, membership function, fuzzy algorithm 


⊙第66篇⊙

應用神經網絡隱式視覺模型進行立體視覺的三維重建
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注意:本論文已在《計算機輔助設計與圖形學學報》,2003,15(3):293-296上發表
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袁野1.2 歐宗瑛2 田中旭3 
(1. 大連理工大學自動化系,大連,116024) (2.大連理工大學機械學院CAD&CG研究所,大連,116024)
(3.上海大學機器人中心,上海,200072)

摘要:針對傳統的基于精確數學模型的立體視覺方法過程繁瑣的不足,本文提出了一種應用BP神經網絡隱式視覺模型進行三維重建的算法,將多個標定平面放置在有效視場內,用神經網絡模擬立體視覺由兩個二維圖像重建三維幾何的過程,經過網絡訓練建模后,無須攝像機標定即可進行三維重建。仿真實驗結果證明了該方法比較簡單,且能保持較高的精度。
關鍵字:BP網絡,立體視覺,三維重建

3D Reconstruction in Stereo Vision using Neural Networks implicit vision model

Yuan Ye 1.2 Ou Zongying 2 Tian Zhongxu3 
1Automation Department, Dalian University of Technology, Dalian, 116024
2CAD&CG lab, Mechanical Engineering Department, Dalian University of Technology, Dalian, 116024(3.Robot Center ,Shanghai University ,Shanghai, 200072) 

Abstract: The classical stereo vision algorithms based on explicit model are very complicated, an algorithm of stereo vision based on BP neural networks implicit vision model was proposed in this paper. Multi calibration planes were placed in the effective view field, neural network was used to approximate the process from two image points to the 3D point, after training the BP networks a implicit model was built, the 3D points can be reconstructed without the complicated calibration. The experimental results show that the algorithm gains simplicity and high accuracy.
Keywords: neural networks
stereo vision3D Reconstruction


⊙第67篇⊙

三江平原毛果苔草濕地光輻射能的利用與分配
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注意:本論文已在《水生生物學報》2003,27(5):502-506上發表
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何池全 李 蕾 顧 超 陸曉怡
(上海大學環境科學與工程系, 上海, 200072)

摘要:毛果苔草濕地的物理過程觀測設在中國科學院三江平原沼澤濕地生態實驗站內,用美國CID公司出品的光合儀對典型濕地中幾種優勢植物的光合能力進行測定;在80。C干燥的植物樣品(含各種不同的構件),粉碎后,分別稱量約1g左右,用美國公司Parr型氧彈式熱量計測定;研究發現毛果苔草濕地建群種中毛果苔草的凈光合速率最大, 為47.41μmol·m-2·s-1。以太陽總輻射能和生長季內光合有效輻射為基礎計算出各器官的能量利用效率計, 極大值是細根, 分別為1.3945%和3.1879%, 極小值是穗, 分別為0.0020%和0.0046%,毛果苔草種群的能量利用率為2.54%。濕地不同植物群落地下部分的能量含量分布中毛果苔草群落的地下部分能量含量的平均值最大。這說明毛果苔草種群具有較高的能量轉化效率,并將大部分能量儲存在地下部分。在不同層次的能量含量分配中,隨著土壤深度的增加,地下部分的能量含量是趨于遞減趨勢的。
關鍵詞:毛果苔草;濕地生態系統;光合作用;初級生產效率;地下器官能量含量

The utilization and distribution of the sunshine radiant energy of Carex lasiocarpa wetland in Sanjiang Plain

He Chiquan Li Lei Gu Chao Lu Xiaoyi
(Department of Environmental Science and Engineering, Shanghai  University;Shanghai,200072)

Abstract: Carex lasiocarpa is a rhizomatous clonal species of mire wetlands in Northeastern of China. The fieldwork about physical process of Carex lasiocarpa wetlands was carried out in the Shangjiang Plain Mire Wetlands Ecological Experiment Station in Chinese Academy of Science in Northeastern of China (47。31`N, 133。31`E). The field work was carried out in a typical Carex lasiocarpa wetlands, which areas is 200×450m2 and it can divided into three areola, namely the determined areola of biomass; the determined areola of wither biomass and its decompose areola, and then it was setup each other which was used to sampling and observation from May to October in 1998-1999,the frequency was about 30d, the sampling area was 1×1 m2 with 2~3 times. The plants were divided into different compartments, in which is leaf, sheath, rhizome, inflorescence, spike, radicula and dead standing sampling, and dried to constand weight at 80。C, after which they were ground and samples were taken for analysis. The plant caloric value is determined by Parr type Oxygen bomb heat meter which is made in America. The photosynthesis is determined by photosynthesis meter, which is made in CID company in America; is analys Plant photosynthesis is the original force to impel and to support the whole ecosystem, we found that the net photosynthesis rate of Carex lasiocarpa is biggest than others in Carex lasiocarpa wetland, which is 47.41μmol·m-2·s-1. In the basis of the overall sunshine radiation and the photosynthesis availability radiation to count the energy utilization rate of each organs/component, the maximum is radicula, which are 1.3945% and 3.1879%, the minimal value is spike, which are 0.0020% and 0.0046%,the energy utilization efficiency of Carex lasiocarpa population is 2.54%. The average value of underground organs/components energy content of Carex lasiocarpa community is biggest than its in others community, which showed that C. lasiocarpa had higher energy productive efficiency and most energy was stored in their under-ground part, the reason for these were also discussed. In the allocation of energy content in different underground layer, with the increase of soil depth, energy content in different underground layer is decrease by degrees.
Keywords: Carex lasiocarpa, wetland ecosystem, photosynthesis, primary production efficiency, energy content


⊙第68篇⊙

THE ALLELOPATHIC EFFECT OF Acorus tatarinowii UPON ALGAE
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注意:本論文已在Journal of Environmental Science. 2001, 13(4):481-484上發表
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Chiquan He(何池全)
The department of Environmental Science & Engineering, Shanghai University; Shanghai 200072, China
Changke Wang(王長科)
Changchun Institute of Geography, Chinese Academy of Sciences,Changchun, 130021,China)1

Abstract: Besides competing with algae for light and mineral nutrients (i.e. N, P, etc.), the root system of Acorus tatarinowii excretes some chemical substances, which injure and eliminate alga cells, to inhibit the growth of the algae. When the algae cells were treated in "A. tatarinowii water", some of the chlorophyll a were destroyed and the photosynthetic rate of algae decreased markedly and the ability of alga cells to deoxidize triphenyltetrazolium chloride (TTC) reduced greatly. Then alga cells turned from bright red to bluish green under fluorescence microscope. These showed that the allelopathic effects of A. tatarinowii on algae were obvious and planting A. tatarinowii can control some green algae. The experiment on the extractions of the secretions of the root system showed that the inhibitory effect had a concentration effect. If the concentration of the root secretion was below 30ul/disc, the inhibitory rate was negative; if it was over 45ul/disc, the inhibitory rate was positive. This proved that the influence of the root secretion on the same acceptor was a kind of concentration effect. When the concentration of the root secretion was low, it promoted the growth of algae; when the concentration reached a definite threshold value, it restrained the growth of algae. In present case, the threshold value was between 30 ul/disc and 45 ul/disc.
Keywords: Acorus tatarinowii Allelopathy Algae Wetlands


第69篇⊙

鋼筋混凝土柱“強剪弱彎”設計可靠性分析
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注意:本論文已在《水利學報》 2002(4):88-92,96上發表
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馬宏旺 
(大連理工大學海岸及近海工程國家重點實驗室,遼寧 大連 116024)

摘要:基于現行建筑抗震設計規范(GBJ11-89),把鋼筋混凝土柱的設計參數看作隨機變量,柱的破壞看作由抗彎與抗剪失效模式組成的串聯體系,采用Monte Carlo模擬法,分析了鋼筋混凝土柱“強剪弱彎”設計的可靠性。重點分析了不同軸壓比下,鋼筋混凝土框架柱剪切破壞先于彎曲破壞發生的概率,為合理的確定剪切增強系數提供分析參考。
關鍵詞:鋼筋混凝土柱 強剪弱彎 可靠性分析 Monte Carlo模擬 

Reliability Analysis for Strong Shear-Weak Bending Design of Reinforced Concrete Columns

Reliability Analysis for Strong Shear-Weak Bending Design of Reinforced Concrete Columns
Ma Hongwang
(Civil Engineering, Dalian University of Technology,116023)

Abstract: Based on current seismic design code, design parameters of reinforced concrete columns are considered as random variables. Failure mode of columns is considered as series system. Reliability of Strong shear-weak bending design is analyzed by Monte Carlo simulation method. The probability of shear failure prior to flexural failure is obtained, Aiming to provided to reference for determining shear strength factor. 
Keywords: reinforced concrete column Strong shear-Weak bending reliability analysis Monte Carlo simulation 


第70篇⊙

鋼筋混凝土框架梁基于可靠度理論的抗震優化設計
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注意:本論文已在《建筑結構》 2003,9上發表
使用者請注明論文出處

馬宏旺 呂西林
(同濟大學土木學院結構工程與防災研究所,200092,上海)

摘要:針對混凝土設計規范(GB 50010-2002)中,矩形、T形和I形截面的一般框架梁抗剪設計進行可靠度評估。把梁的設計參數(混凝土強度、箍筋配筋率、鋼筋強度、自重荷載效應和地震作用效應)看作隨機變量,采用Monte Carlo 模擬法,得出按新規范設計不同抗震等級梁的抗剪可靠指標的變化范圍。把設計參數分別看作確定性變量和隨機變量,文中針對新、舊規范(GBJ10-89)的抗剪設計安全性進行了比較分析。結果表明按照新規范進行梁的抗剪設計比舊規范更安全。
關鍵詞:鋼筋混凝土梁 抗剪 可靠度 Monte Carlo模擬 

Reliability Evaluation of Seismic Shear Design for Reinforced Concrete Beams

Ma Hongwang ,  Lu Xilin
(Civil Engineering Department of Tongji University, ShangHai 200092,China)

Abstract: Reliability evaluation for seismic shear design of general reinforced concrete frame beams designed following The Code(GB 50010-2002)is finished. The design parameters such as strength of concrete, strength of steel, gravity load and earthquake action are regarded as random variables. Seismic shear reliability index of the beams is obtained by Monte Carlo simulation method. At the same time, from two aspects of determination and uncertainty, safety of seismic shear design of beams is compared between the new code(GB50010-2002) and the old code(GBJ10-89). The results indicated that shear design of beams following the new code is more safety than following the old code.
Key words: reinforced concrete beam; shear design; reliability


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