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ѵ51ƪ

Study on Hydrothermal Cracking of Heavy Oils: Formation of Radical Under Lower Reaction Temperature
dӢZՓȫՈc朽
ע⣺ՓAnal. Rep. Eng. Res. Inst. Facul. Eng. Univ. Tokyo, vol.59, pp.111l
ʹՈעՓij̎

Jie CHANGܣ, 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.


ѵ52ƪ

Hydrothermal cracking of Residual Oil
dӢՓȫՈc朽
ע⣺ՓActa Petrolei Sinica (Petroleum Processing Section), Vol.17 (1), pp.42l
ʹՈעՓij̎

Kaoru Fujimoto, Jie Changܣ 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.


ѵ53ƪ

Free-surface waves and far wakes generated by a floating body in a viscous fluid. Journal of Hydrodynamics
dӢZՓȫՈc朽
ע⣺Փ. Journal of Hydrodynamics, Ser. B, Vol. 15, No. 4, pp.10-16. Aug. 2003.l
ʹՈעՓij̎

Lu Dong-qiang.(R|)
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


ѵ54ƪ

ǾˮHamiltonϵyՓcоMչ
dՓȫՈc朽
ע⣺ՓWMչ 284,521-531, 199811l
ʹՈעՓij̎

, R|, ,
ϺWϺБÔWWоϺ200072

ժҪ ׺Փc㷨HamiltonWеđCǾˮHamiltonՓоMչUǾˮHamilton׃ԭcăԽc̽ӑKdV̺BBM̵HamiltonQcغǾˮHamiltonодMһоĆ}ͽⷨO
PI~ Hamilton׃ԭ׺ǾˮHamiltonϵyQcغ

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.


ѵ55ƪ

Poisson ̖xµğoFSLie
dՓȫՈc朽
ע⣺ՓWW 1998303,307-313, 19985l
ʹՈעՓij̎

, R|,
ϺWϺБÔWWоϺ200072

ժҪ ᘌDdV̵HamiltonʽһN^CPoisson̖͟oFSLieоKdV̵HamiltonʽĵһecPoisson̖PϵõжһeֵijֱҪlKdV̵ĵһe
PI~ KdVHamiltonʽһePoisson̖oFSLie

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..


ѵ56ƪ

ӋCo¸OӋо
dՓȫՈc朽
ע⣺ՓProceedings of the 5th International Conference on Frontiers of Design and Manufacturing (ICFDM'2002)l
ʹՈעՓij̎
(ISTP䛱)

ه O Sƽ r
AW Cе̌WԺ V 510640

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PI~OӋڌCBRCAz㷨GA
ЈD̖TH122 īIRaA

RESEARCH ON COMPUTERCAIDED 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)


ѵ57ƪ

Multiple travelling wave solutions of nonlinear evolution equations using a unified algebraic method
dӢZՓȫՈc朽
ע⣺Փ JOURNAL OF PHYSICS A: MATHEMATICAL AND GENERAL 35 (2002) 6853C6872 l
ʹՈעՓij̎
(SCI䛱)
Engui FanF
Institute of Mathematics, Key Laboratory for Nonlinear Mathematical Models and Methods,
Fudan University, Shanghai 200433, Peoples 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, KdVCMKdV, Itos fifth MKdV, Hirota, NizhnikCNovikovCVeselov, BroerCKaup, generalized coupledHirotaCSatsuma, coupled SchrodingerCKdV, (2 + 1)-dimensional dispersive long wave, (2 + 1)-dimensional DaveyC 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.


ѵ58ƪ

A family of completely integrable multi-Hamiltonian systems explicitly related to some celebrated equations
dӢՓȫՈc朽
ע⣺ՓJOURNAL OF MATHEMATICAL PHYSICS VOLUME 42, NUMBER 9 SEPTEMBER 2001:4327-4344l
ʹՈעՓij̎
(SCI)
Engui FanF
Institute of Mathematics, Fudan University, Shanghai 200433, Peoples 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 KaupCNewell-type hierarchy of nonlinear evolution equations, which is explicitly related to many important equations such as the Kundu equation, the KaupCNewell ~KN! equation, the ChenCLeeCLiu ~CLL! equation, the GerdjikovCIvanov ~GI! equation,the Burgers equation, the modified Korteweg-deVries ~MKdV! equation and the SharmaCTassoCOlver equation. It is shown that the hierarchy is integrable in Liouvilles 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  KaupCNewell-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 Schrodinger 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.


ѵ59ƪ

S߅·ԘOƽϵyܛSLOPE^3DOӋ
dՓȫՈc朽

ע⣺ՓrʯWčW.2003,22(7):1121-1125 l
ʹՈעՓij̎

x ,2 Ц2 S2 T2 
1.hWˮl늹ϵ h4300722.ЇƌWԺhrWо h 430071

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PI~: ߅·Է Oƽⷨ Sҕ 

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


ѵ60ƪ

A Model of Point-to-Face Contact for Three-Dimensional Discontinuous Deformation Analysis
dՓȫՈc朽
ע⣺ՓRock Mechanics and Rock Engineering. August 18, 2003 # Springer-Verlagl
ʹՈעՓij̎

Q. H. Jiang1x 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.


ѵ61ƪ

Dosing system for the nanolitre range,fabricated with the AMANDA process
dӢZՓȫՈc朽
ע⣺Փ
JOURNAL OF MICROMECHANICS AND MICROENGINEERING. 13 (2003) S85CS90l
ʹՈעՓij̎

P Shao(), Z Rummler and WK Schomburg
Forschungszentrum Karlsruhe, Institut fur 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 109C110) 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.


ѵ62ƪ

Polymer micro piezo valve with a small dead volume
dӢՓȫՈc朽

ע⣺ՓINSTITUTE OF PHYSICS PUBLISHING JOURNAL OF MICROMECHANICS AND MICROENGINEERING. 14 (2004) 305C309l
ʹՈעՓij̎

Peige Shao1(), Zeno Rummler2 and Werner Karl Schomburg3
Forschungszentrum Karlsruhe, Institut fur 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. 


ѵ63ƪ

C\ӌW
dՓȫՈc朽
ע⣺ՓϺͨWW2002,36 (9):13651369l
ʹՈעՓij̎

,,,Mୂ
(ϺͨWCе̌WԺϺ200030)

ժҪRoller-walkerALDUROOӋ˲݆ϽYCںҪBҎ\ӌWĻAPđTϵ͝L݆ϵL݆ڷoLӵļOĶλ݆\ӼsȻ˙C˵\ӌWģӑՓ˙C˵ƄԆ}óC˴\ӵėlͬrOӋC\ӌWBg_ʽC˞DֱЕr\ӌW}
PI~ CƄәC\ӌWBg
ЈD̖: TP242.1 īIRa 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 UniversityShanghai200030)

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 RobotMobile robot,KinematicsState space 


ѵ64ƪ

The core doninance parameter of extragalactic radio sources
dӢՓȫՈc朽
ע⣺ՓAsronomy & Astrophysics June 11, 2003,1C14l
ʹՈעՓij̎

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 


ѵ65ƪ

С׃Qģ㷨tWD߅zy㷨
dՓȫՈc朽
ע⣺ՓBWWVol.42,No.4.2002504508l
ʹՈעՓij̎

ԬҰ1.2 W2
(1BWԄӻϵB116024 2BWCеϵCAD&CGоB116024

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PI֣С׃Q߅zyģOֵ`ٺģ㷨

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 


ѵ66ƪ

񽛾Wj[ʽҕXģMwҕXSؽ
dՓȫՈc朽
ע⣺ՓڡӋCoOӋcDΌWW,2003,15(3):293-296ϰl
ʹՈעՓij̎

ԬҰ1.2 W2 3 
(1 BWԄӻϵB116024) (2.BWCеWԺCAD&CGоB116024
3ϺWCϺ200072

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PI֣BPWjwҕXSؽ

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


ѵ67ƪ

ƽԭë̦ݝعݗܵc
dՓȫՈc朽
ע⣺ՓڡˮW2003275502-506ϰl
ʹՈעՓij̎

γȫ ꑕ
ϺWhƌWcϵ, Ϻ, 200072

ժҪë̦ݝص^^yOЇƌWԺƽԭӝɝBվCID˾ƷĹσx͝Ў׷NֲĹMМy80CֲƷNͬĘքeQs1g˾ParrʽӋyоlFë̦ݝؽȺNë̦ݵă, 47.41molm-2s-1̫ꖿݗܺLȹЧݗAӋٵЧӋ, OֵǼ, քe1.3945%3.1879%, OСֵ, քe0.0020%0.0046%ë̦ݷNȺʞ2.54%زֲͬȺ²ֲֵë̦Ⱥĵ²ƽֵ@fë̦ݷNȺ^ߵDЧ󲿷ڵ²ڲͬӴεSȵ²ֵڅfpڅݵ
PI~ë̦BϵyaЧ

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 (4731`N, 13331`E). The field work was carried out in a typical Carex lasiocarpa wetlands, which areas is 200450m2 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 1998-1999the frequency was about 30d, the sampling area was 11 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 80C, 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 47.41molm-2s-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


ѵ68ƪ

THE ALLELOPATHIC EFFECT OF Acorus tatarinowii UPON ALGAE
dӢZՓȫՈc朽
ע⣺ՓJournal of Environmental Science. 2001, 13(4):481-484ϰl
ʹՈעՓij̎

Chiquan He(γȫ)
The department of Environmental Science & Engineering, Shanghai University; Shanghai 200072, China
Changke WangLƣ
Changchun Institute of Geography, Chinese Academy of SciencesChangchun, 130021China)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


69ƪ

䓽OӋɿԷ
dՓȫՈc朽
ע⣺ՓڡˮW 2002(4):88-92,96ϰl
ʹՈעՓij̎


BẆc| B 116024

ժҪڬFнOӋҎGBJ11-89䓽OӋSC׃ƉĿɿcʧЧģʽMɵĴ“wϵMonte CarloģM䓽OӋĿɿc˲ͬS䓽ƉڏƉİlĸĴ_ϵṩ
PI~䓽 ɿԷ Monte CarloģM 

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 


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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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