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  BS 1722 Fences
Posted by: ir_71 - 11-18-2010, 05:37 AM - Forum: British Standards (BS) - Replies (3)

BS 1722 Fences

[Image: info.png]
Contents of the package:
1. BS 1722-1:2006 Fences. Specification for chain link fences
BS 1722-1 specifies requirements for chain link fences, gates and gateposts for use with chain link fences. The gates specified are steel with a provision for chain link infill or other infill if required by the purchaser.

2. BS 1722-2:2006 Fences. Specification for strained wire and wire mesh netting fences

3. BS 1722-5:2006 Fences. Specification for close-boarded fences and wooden palisade fences

4. BS 1722-7:2006 Fences. Specification for wooden post and rail fences

5. BS 1722-8:2006 Fences. Specification for mild steel (low carbon steel) continuous bar fences and hurdles
BS 1722-8 provides requirements for mild steel (low carbon steel) continuous bar fences for farm animal containment applications and welded hurdle fences of continuous bar type.

6. BS 1722-9:2006 Fences. Specification for mild steel (low carbon steel) fences with round or square verticals and flat horizontals
This British Standard, a part of the BS 1722 series, specifies requirements for self adjusting (nibbed) or welded mild steel (low carbon steel) fences with round or square verticals and rolled hollow section (RHS) or rolled steel joist (RSJ) posts and flat horizontals. It also specifies requirements for their installation.

This British Standard covers requirements for protective treatment. However, maintenance of the fence after installation is outside the scope of this standard.

This standard aims to establish minimum requirements for materials and workmanship of the more common types of fence in order to ensure satisfactory service for the purchaser, and to assist manufacturers and installers by eliminating unnecessary minor variations in the demands of purchasers. It specifies requirements for the components that make up a fence and the way in which the fence needs to be constructed. The standard includes requirements for sizes of components, together with the permissible tolerances on size.

The major changes in this revision are the removal of flat posts from the standard, the inclusion of RHS posts, removal of requirements for angle corner posts, which in this edition are specified as for line posts, and revision of the requirements for gates. The opportunity has also been taken to simplify the construction and installation requirements in line with current practice.

BS 1722-9 specifies requirements for self-adjusting (nibbed) or welded mild steel (low carbon steel) fences with round or square verticals and rolled hollow section (RHS) or rolled steel joist (RSJ) posts and flat horizontals. It also specifies their requirements for installation.

7. BS 1722-10:2006 Fences. Specification for anti-intruder fences in chain link and welded mesh
This part of BS 1722 specifies requirements for anti-intruder chain link or welded mesh fences and gates of at least 2.4 m in height for situations that require a higher level of protection than that offered by fences conforming to BS 1722-1. This British Standard also covers requirements for the installation of the fencing at the specified location. Provision is made for either single or double extension arms.

The aim of this standard is to establish minimum requirements for material and workmanship of the more common types of fence in order to ensure satisfactory service for the purchaser, and to assist manufacturers and erecting contractors by eliminating unnecessary minor variations in the demands of purchasers.

The specification given in this standard is suitable for use in industrial estates, airfields, oil and gas installation etc.

This revision of BS 1722-10 provides a more detailed specification for gates and locking devices. Further changes in this revision include clarification of the specification for posts and the use of heavier gate posts to act as fence strainers. The thickness of stirrup wire has been lowered to facilitate fixing of the mesh. Cube tests of concrete strength are now required and the frequency of testing is specified to ensure that regular quality checks are made.

8. BS 1722-11:2006 Fences. Specification for prefabricated wood panel fences
BS 1722-11 details requirements for the materials, design, construction and installation of prefabricated wood panel fences constructed from softwood panels, fixed between timber or concrete posts. This standard does not cover fences of a height greater than 2 m above ground level.

9. BS 1722-12:2006 Fences. Specification for steel palisade fences
This British Standard, a part of the BS 1722 series, specifies requirements for steel palisade fences and gates for general purposes (GP) in corrugated and angle pales for heights up to 2.4 m and for security (SP) purposes in corrugated pales for heights of 3.0 m and 3.6 m, all with posts at 2.75 m centres. This standard also covers fences between 2.4 m and 3.0 m in height with components constructed to the SP specification.

This standard specifies requirements for fence materials and their combination and installation.

In situations of extreme exposure or abnormal loading it will be necessary to carry out a special appraisal and for the design criteria to be specified.

10. BS 1722-14:2006 Fences. Specification for open mesh steel panel fences
BS 1722-14 specifies requirements for the following categories of open mesh steel panel fences:

Category 1: General purpose fences up to 2.4 m high;
Category 2: Security fences at least 2.4 m high;
Category 3: High security fences at least 3.0 m high;
Category 4: Extra high security fences at least 3.0 mm high.
Requirements for the performance of panel fences for this standard are based upon loadings.

The principal changes introduced in this edition are to bring the requirements up to date with other parts of BS 1722 and to accommodate changes in cross references to other standards. This edition also introduces requirements for very high security fences and for concrete posts for fences.

11. BS 1722-16:2009 Fences. Specification for powder coatings used as a plastics finish to components and mesh

Dear friends, if someone of you have the missing standards from this standard series, please share it.

:JC_cheers:

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  Uses Of Metals And Metallic Minerals
Posted by: ir_71 - 11-18-2010, 05:09 AM - Forum: General Books - Replies (1)

Uses Of Metals And Metallic Minerals

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The book is much more than a mere list of uses of the metals and metallic minerals, which historically and contemporarily occupy a very important place in the civilization of human race and in the day-to-day human life. Uses of metals have been projected along with their backward linkages with history, recovery from minerals and particular sets of physical/chemical characteristics and with their forward linkages with the status and trends in waste utilization and substitution wherever relevant. Apart from extraction of metals, the direct industrial uses of the metallic minerals and the specifications with emphasis on the principles and reasons have also been discussed. In this book, the 12 metallic minerals, 29 metals and 6 metalloids that are important in today?s economy, have been brought within one cover. Some of the information incorporated in it are not ordinarily accessible to many, but have been obtained by the author through personal contacts with the industries during the last 35 years. The book presents a highly technical subject in an easily understandable logical fashion.

About the Author(s):
K.K. Chatterjee born in January, 1944 in Burdwan, West Bengal, the author`s school and early college education was in Burdwan and Kolkata. Then he studied in Indian School of Mines, Dhanbad and obtained his postgraduate degree in Applied Geology in 1966 from Ranchi University, and also the Associateship of Indian School of Mines (AISM Diploma). He carried out his research work in the field of Coal Geology at Indian School of Mines and was awarded a Ph.D. degree by the same Institute in 1969.

For a period of about 3 years, he served as an Instructor in the Department of Applied Geology in that Institute before joining Indian Bureau of Mines as Assistant Mineral Economist in 1972, from where he retired in 2004, as Chief Mineral Economist and Head of the Mineral Economics Division.

During his professional career in the field of mineral economics, spanning over three decades, he has also keenly watched a variety of management situations and how they are responded to. In connection with his professional activity he has widely travelled within India and also several countries abroad. Besides he has been associated with various committees and expert groups constituted from time to time by the Government of India, as member or as chairman. Besides many technical papers, he has authored one book on the subject of Mineral Economics.

Contents:
Section I: Metallic Minerals? Bauxite and Aluminium
Chromite
Ilmenite and Titanium
Iron ore: Hematite
Iron ore: Magnetite
Iron ore: Siderite
Iron ore: Taconite
Iron ore: Others
Lithium minerals and metal
Manganese ore.
Section II: Metals?Beryllium
Cadmium
Calcium
Cesium
Cobalt
Copper
Gallium
Germanium
Gold
Indium
Lead
Magnesium
Mercury
Molybdenum
Nickel
Niobium (Columbium)
Platinum Group Metals
Potassium
Rare earth metals
Rhenium
Rubidium
Silver
Sodium
Tantalum
Thallium
Tin
Tungsten
Vanadium
Zinc.
Section III: Metalloids?Antimony
Arsenic
Bismuth
Boron
Selenium
Tellurium.



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  New Developments in Field and Laboratory Testing of Soils
Posted by: tynhanh - 11-18-2010, 01:40 AM - Forum: Archive - No Replies

New Developments in Field and Laboratory Testing of Soils
Authors: Jamiolkowski, M., Ladd, C.C., Germaine, J.T. & Lanellotta, R. (1985); Theme Lecture No. 2," Proc. 11th Intl. Conf. Soil Mechs. and Foundn. Engrg., San Francisco, Vol. 1, pp. 57-155.

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  Bridges for High Speed Railways
Posted by: melkat - 11-18-2010, 01:39 AM - Forum: Bridge (Project and Technology) - Replies (4)

Bridges for High Speed Railways

[Image: 66019579264695997246.jpg]

[Image: info.png]
Editors
Rui Calçada, Raimundo Delgado &
António Campos e Matos
Department of Civil Engineering, Faculty of Engineering,
University of Porto, Portugal
© 2009 Taylor & Francis Group, London, UK
ISBN: 9780415471473 (hbk)
ISBN: 9780203892541 (ebook)
Size of zip file: 58.95 mb
288 pages

In this context, this book includes the contributions of a group of international specialists in this field, sharing their knowledge and expertise with the engineering community, and discussing the structural behaviour and performance of existing solutions and potential improvements. The book includes a number of chapters covering the following topics:
– Design;
– Codes and Dynamic Analysis;
– Construction;
– Monitoring, Maintenance and Repair.

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  Characterisation and Engineering Properties of Natural Soils
Posted by: melkat - 11-17-2010, 06:39 PM - Forum: Foundation & Geotechnics in general - Replies (3)

CHARACTERISATION AND ENGINEERING PROPERTIES OF NATURAL SOILS Volume 3 & 4

[Image: 72726452479819266047.jpg]

[Image: info.png]
Editors
T.S. Tan
Department of Civil Engineering, National University of Singapore
K.K. Phoon
Department of Civil Engineering, National University of Singapore
D.W. Hight
Geotechnical Consulting Group, London
S. Leroueil
Département de Génie Civil, Université Laval, Ste-Foy, Québec
© 2007 Taylor & Francis Group, London, UK
ISBN for complete set of volumes 3 and 4: 9780415426916
Size of zip file: 137 mb
1195 pages

The present proceedings are numbered Vols. 3 and 4 because they form an integral part of the entire series. It contains three overview papers on laboratory testing, in-situ testing, and characterisation of natural soil variability. Less well documented soil types such as organic clays and peats, loess, volcanic soils, residual soils, methane hydrate soils, and recent sediments are covered by fifteen papers. The remaining papers cover: alluvial and marine clays (6), highly fissured clays (1), boulder clay (1), silts (1), and natural soil variability (4). Following the tradition of the first workshop, authors were invited under consultation with the advisory committee chaired by Dr David Hight. The length and quality of the papers speak volumes on the tremendous dedication and efforts invested by all the invited authors. It is worth reiterating that the major part of the credit for this entire series belongs to the authors.

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  Cable-Stayed and Suspension Bridges, Deauville
Posted by: chrono146 - 11-17-2010, 06:37 PM - Forum: Archive - Replies (1)

Hello,

I'm looking for the following books:

Cable-Stayed and Suspension Bridges, Deauville 1994, France. Proceedings Volume 1 and 2. Association Internationale des ponts et Charpentes, IABSE, AIPC, IVBH. Federation Internationale de la Precontrainte.

Regards,

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  ENVIRONMENTAL CONDITIONS AND ENVIRONMENTAL LOADS
Posted by: tuanpecc1 - 11-17-2010, 02:14 PM - Forum: Environmental Engineering - Replies (1)

ENVIRONMENTAL CONDITIONS AND ENVIRONMENTAL LOADS

[Image: 53330485074738669176.png]

[Image: info.png]
Publisher: DET NORSKE VERITAS
Pages: 124
Date: APRIL 2007

This new Recommended Practice (RP) gives guidance for modelling, analysis and prediction of environmental conditions as well guidance for calculating environmental loads acting on structures. The loads are limited to those due to wind, wave and current. The RP is based on state of the art within modelling and analysis of environmental conditions and loads and technical developments in recent R&D projects, as well as design experience from recent and ongoing projects .
The basic principles applied in this RP are in agreement with the most recognized rules and reflect industry practice and latest research.

CONTENTS

1. GENERAL
2. WIND CONDITIONS
3. WAVE CONDITIONS
4. CURRENT AND TIDE CONDITIONS
5. WIND LOADS
6. WAVE AND CURRENT INDUCED LOADS ON SLENDER MEMBERS
7. WAVE AND CURRENT INDUCED LOADS ON LARGE VOLUME STRUCTURES
8. AIR GAP AND WAVE SLAMMING
9. VORTEX INDUCED OSCILLATIONS
10. HYDRODYNAMIC MODEL TESTING


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  USACoE: Underwater Geotechnical Foundations
Posted by: SR71 - 11-17-2010, 01:57 PM - Forum: Foundation & Geotechnics in general - No Replies

Underwater Geotechnical Foundations
US Army Corps of Engineers
ERDC/GSL TR-01-24

[Image: 52492595124481173131.jpg]

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This report was prepared for Headquarters, U.S. Army Corps of Engineers (HQUSACE), as part of the Innovations for Navigation Projects (INP) Research Program. The study was conducted under INP Work Unit 33144, “State of the Art for Preparing Foundations Underwater,” managed at the U.S. Army Engineer Research and Development Center (ERDC), Vicksburg, MS.

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  [split] Wind Engineering and wind tunel testing
Posted by: epee - 11-17-2010, 01:50 PM - Forum: Journals, Papers and Presentations - No Replies

University of Notre Dame has a very good website for wind engineering especially the wind simulator.

The wind time history generated are base on ASCE 7 with Kaimal's spectral formula.

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  Meshfree Methods for Partial Differential Equations V
Posted by: miquan - 11-17-2010, 01:00 PM - Forum: Finite Element Methods - Replies (1)

Meshfree Methods for Partial Differential Equations V

[Image: 01367179847768348758.jpeg]

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Meshfree Methods for Partial Differential Equations V (Lecture Notes in Computational Science and Engineering)
By Michael Griebel, Marc Alexander Schweitzer


Publisher: Springer
Number Of Pages: 250
Publication Date: 2010-11-25
ISBN-10 / ASIN: 3642162282
ISBN-13 / EAN: 9783642162282


The numerical treatment of partial differential equations with particle methods and meshfree discretization techniques is an extremely active research field, both in the mathematics and engineering communities. Meshfree methods are becoming increasingly mainstream in various applications. Due to their independence of a mesh, particle schemes and meshfree methods can deal with large geometric changes of the domain more easily than classical discretization techniques. Furthermore, meshfree methods offer a promising approach for the coupling of particle models to continuous models. This volume of LNCSE is a collection of the papers from the proceedings of the Fifth International Workshop on Meshfree Methods, held in Bonn in August 2009. The articles address the different meshfree methods and their use in applied mathematics, physics and engineering. The volume is intended to foster this highly active and exciting area of interdisciplinary research and to present recent advances and findings in this field.



Table of Contents

Preface
Contents
Global-local Petrov-Galerkin formulations in the Meshless Finite Difference Method
1 Introduction
2 Boundary value problem formulations
3 Meshless local Petrov-Galerkin formulations
4 Meshless local Petrov-Galerkin 5 (MLPG5) formulation
5 Basic Meshless Finite Difference Method solution approach
6 Combination of the MFDM and MLPG5
7 Higher order approximation based on correction terms
8 A-posteriori error analysis
9 Adaptive solution approach
10 Error indicators
11 HO MFDM / MLPG5 approach in 1D
12 HO MFDM / MLPG5 approach in 2D
13 Extensions of the MFDM / MLPG5 solution approach
14 The MFDM / MLPG7 approach
15 Numerical examples
16 Final remarks
References
Treatment of general domains in two space dimensions in a Partition of Unity Method
1 Introduction
2 Particle--Partition of Unity Method
2.1 Numerical Integration
3 Realization on General Domains
3.1 Domain Representation
3.2 Clipping a curved multiply connected domain
3.3 Decomposition and parametrization
3.4 Rectangle-NURBS clipping
4 Numerical Experiments
5 Concluding Remarks
References
Sampling Inequalities and Support Vector Machines for Galerkin Type Data
1 Introduction
2 Review on sampling inequalities
2.1 Proof Sketch
3 Sampling Inequalities based on Weak Formulations
3.1 Sampling inequalities based on Pythagoras law
4 Regularization and Machine Learning
References
Meshfree Vectorial Interpolation Based on the Generalized Stokes Problem
1 Introduction
2 Vectorial interpolation
2.1 Divergence-free interpolation based on the stream function
2.2 Multi-elliptic interpolation, scalar problems
3 Multi-elliptic divergence-free interpolation, vectorial problems
3.1 The generalized Stokes problem
4 Solution techniques
4.1 Uzawa's method
4.2 The method of fundamental solutions
5 Summary and conclusions
References
Pressure XFEM for two-phase incompressible flows with application to 3D droplet problems
1 Introduction
2 Mathematical model
3 Numerical methods
3.1 Overview of numerical methods
3.2 Pressure XFEM space
4 Analysis of pressure XFEM space
4.1 Approximation order of pressure XFEM space
4.2 Stabilization of XFEM basis
5 Numerical experiment
References
Special-relativistic Smoothed Particle Hydrodynamics: a benchmark suite
1 Introduction
2 Relativistic SPH equations from a variational principle
3 Artificial dissipation
4 Test bench
4.1 Test 1: Riemann problem 1
4.2 Test 2: Riemann problem 2
4.3 Test 3: Riemann problem 3
4.4 Test 4: Sinusoidally perturbed Riemann problem
4.5 Test 5: Relativistic Einfeldt rarefaction test
4.6 Test 6: Ultra-relativistic advection
5 Conclusions
References
An exact particle method for scalar conservation laws and its application to stiff reaction kinetics
1 Introduction
2 Characteristic Particles and Similarity Solution Interpolant
3 Shock Particles
3.1 Evolution of Shock Particles
3.2 Interaction of Shock Particles
4 An ``Exact'' ODE Based Method
4.1 Approximation of the Initial Conditions
4.2 Integration in Time
5 Numerical Error Analysis of the Particle Method
6 Stiff Reaction Kinetics
7 A Particle Method for Stiff Reaction Kinetics
7.1 Computational Approach
8 Numerical Results on Reaction Kinetics
9 Conclusions and Outlook
References
Application of Smoothed Particle Hydrodynamics to Structure Formation in Chemical Engineering
1 Introduction
2 Smoothed Particle Hydrodynamics Method
2.1 Governing equations
2.2 Smoothed Particle Hydrodynamics
3 Validation of Single Processes
4 Simulation of the overall process
5 Conclusion and Outlook
6 Acknowledgments
References
Numerical validation of a constraints-based multiscale simulation method for solids
1 Introduction
2 Coupling with projection-based constraints
2.1 Molecular Dynamics
2.2 Multiscale Coupling
2.3 A method for weak coupling conditions
2.4 Damping in zero-temperature simulations
3 Numerical Validation
3.1 Comparison with pointwise constraints
3.2 Energy and reflection measurements
3.3 Mode-I fracture simulation
4 Conclusion
References
Coupling of the Navier-Stokes and the Boltzmann equations with a meshfree particle and kinetic particle methods for a micro cavity
1 Introduction
2 Governing equations
3 Numerical methods
3.1 Particle Method for the Boltzmann equation
3.2 Meshfree particle method for the Navier-Stokes equations
4 Hybrid method
4.1 Adaptive grid refinement
4.2 Selection of time steps
4.3 Coupling condition
4.4 Coupling Algorithm
5 Numerical examples
5.1 CPU time
6 Conclusion
References
Accuracy and Robustness of Kinetic Meshfree Method
1 Introduction
2 Least Squares Meshfree Method
3 Method of calculation of Weights in 2-D
4 Higher Order Accuracy in meshfree methods
5 Kinetic Meshfree Method for Euler Equations
6 Higher order accuracy by combining Defect Correction with Entropy Variables (q-LSKUM)
7 Results and Discussion
8 Conclusion
References
Kinetic meshless methods for unsteady moving boundaries
1 Introduction
2 Least Squares Kinetic Upwind Method on Moving Nodes
3 Formulation of LSKUM_MN
4 Advantages of LSKUM_MN
5 Results and Discussion
5.1 Turbomachinery cascades
5.2 Store separation
6 Conclusions
7 Acknowledgements
References
Efficient cloud refinement for kinetic meshless methods
1 Introduction
2 LSKUM: a meshfree solver
3 Adaptive Cloud Refinement (ACR)
4 Automatic Connectivity Update(ACU)
5 Results and Discussions
5.1 Transonic test case NACA0012
5.2 Supersonic test case NACA0012
5.3 Subsonic test case NACA0012
6 Conclusions
7 Acknowledgements
References
Fast exact evaluation of particle interaction vectors in the finite volume particle method
1 Introduction
2 The Finite Volume Particle Method
2.1 Derivation and properties
2.2 The particle interaction vectors
2.3 Boundary conditions
3 A new choice for the particle weight function
4 Implementation
5 Validation
6 Application to free surface flow
7 Conclusions
References
Parallel summation of symmetric inter-particle forces in smoothed particle hydrodynamics
1 Introduction
2 Implementation of smoothed particle hydrodynamics
3 Symmetric inter-particle forces on a grid of cells
4 Parallel symmetric summation algorithm
5 Experimental results
6 Conclusion
References
Meshfree Wavelet-Galerkin Method for Steady-State Analysis of Nonlinear Microwave Circuits
1 Introduction
2 Wavelet-Galerkin method
2.1 Bubnov-Galerkin projection method
2.2 Haar-wavelets basis
3 Meshfree Wavelet-Galerkin Method
3.1 The network equations formulation
3.2 Solution of the linear subnetwork
3.3 Solution of the nonlinear subnetwork
4 Solution of the network equations
5 Illustrative examples
5.1 Simulation results of the Broadband amplifier
5.2 Simulation results of the Schmitt-Trigger circuit
6 Conclusions
References



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Meshfree Methods for Partial Differential Equations IV

[Image: 34649529132007240435.jpeg]

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Meshfree Methods for Partial Differential Equations IV (Lecture Notes in Computational Science and Engineering)
By Michael Griebel, Marc Alexander Schweitzer

Publisher: Springer
Number Of Pages: 412
Publication Date: 2008-11-01
ISBN-10 / ASIN: 3540799931
ISBN-13 / EAN: 9783540799931
Binding: Paperback

The numerical treatment of partial differential equations with particle methods and meshfree discretization techniques is a very active research field both in the mathematics and engineering community. Due to their independence of a mesh, particle schemes and meshfree methods can deal with large geometric changes of the domain more easily than classical discretization techniques. Furthermore, meshfree methods offer a promising approach for the coupling of particle models to continuous models. This volume of LNCSE is a collection of the proceedings papers of the Fourth International Workshop on Meshfree Methods held in September 2007 in Bonn. The articles address the different meshfree methods (SPH, PUM, GFEM, EFGM, RKPM, etc.) and their application in applied mathematics, physics and engineering. The volume is intended to foster this very active and exciting area of interdisciplinary research and to present recent advances and results in this field.




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Meshfree Methods for Partial Differential Equations III

[Image: 15925572974382412944.jpg]

[Image: info.png]
Meshfree Methods for Partial Differential Equations III (Lecture Notes in Computational Science and Engineering)
By Michael Griebel, Marc A. Schweitzer (Editors)

Publisher: Springer
Number Of Pages: 312
Publication Date: 2006-11-16
ISBN-10 / ASIN: 3540462147
ISBN-13 / EAN: 9783540462149
Binding: Paperback

Meshfree methods for the numerical solution of partial differential equations are becoming more and more mainstream in many areas of applications. Their flexiblity and wide applicability are attracting engineers, scientists, and mathematicians to this very dynamic research area. This volume represents the state of the art in meshfree methods. It consists of articles which address the different meshfree techniques, their mathematical properties and their application in applied mathematics, physics and engineering.



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Meshfree Methods for Partial Differential Equations II

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Meshfree Methods for Partial Differential Equations II (Lecture Notes in Computational Science and Engineering)
By Michael Griebel, Marc A. Schweitzer

Publisher: Springer
Number Of Pages: 303
Publication Date: 2005-01-12
ISBN-10 / ASIN: 3540230262
ISBN-13 / EAN: 9783540230267
Binding: Paperback

The numerical treatment of partial differential equations with particle methods and meshfree discretization techniques is a very active research field both in the mathematics and engineering community. Due to their independence of a mesh, particle schemes and meshfree methods can deal with large geometric changes of the domain more easily than classical discretization techniques. Furthermore, meshfree methods offer a promising approach for the coupling of particle models to continuous models. This volume of LNCSE is a collection of the papers from the proceedings of the Second International Workshop on Meshfree Methods held in September 2003 in Bonn. The articles address the different meshfree methods (SPH, PUM, GFEM, EFGM, RKPM, etc.) and their application in applied mathematics, physics and engineering. The volume is intended to foster this new and exciting area of interdisciplinary research and to present recent advances and results in this field.



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