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Modelling of Nuclear Reactor Multi-physics

Modelling of Nuclear Reactor Multi-physics
From Local Balance Equations to Macroscopic Models in Neutronics and Thermal-Hydraulics

by Christophe Demazière

  • Publisher : Academic Press
  • Release : 2019-11-19
  • Pages : 368
  • ISBN : 012815070X
  • Language : En, Es, Fr & De
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Modelling of Nuclear Reactor Multiphysics: From Local Balance Equations to Macroscopic Models in Neutronics and Thermal-Hydraulics is an accessible guide to the advanced methods used to model nuclear reactor systems. The book addresses the frontier discipline of neutronic/thermal-hydraulic modelling of nuclear reactor cores, presenting the main techniques in a generic manner and for practical reactor calculations. The modelling of nuclear reactor systems is one of the most challenging tasks in complex system modelling, due to the many different scales and intertwined physical phenomena involved. The nuclear industry as well as the research institutes and universities heavily rely on the use of complex numerical codes. All the commercial codes are based on using different numerical tools for resolving the various physical fields, and to some extent the different scales, whereas the latest research platforms attempt to adopt a more integrated approach in resolving multiple scales and fields of physics. The book presents the main algorithms used in such codes for neutronic and thermal-hydraulic modelling, providing the details of the underlying methods, together with their assumptions and limitations. Because of the rapidly expanding use of coupled calculations for performing safety analyses, the analysists should be equally knowledgeable in all fields (i.e. neutron transport, fluid dynamics, heat transfer). The first chapter introduces the book’s subject matter and explains how to use its digital resources and interactive features. The following chapter derives the governing equations for neutron transport, fluid transport, and heat transfer, so that readers not familiar with any of these fields can comprehend the book without difficulty. The book thereafter examines the peculiarities of nuclear reactor systems and provides an overview of the relevant modelling strategies. Computational methods for neutron transport, first at the cell and assembly levels, then at the core level, and for one-/two-phase flow transport and heat transfer are treated in depth in respective chapters. The coupling between neutron transport solvers and thermal-hydraulic solvers for coarse mesh macroscopic models is given particular attention in a dedicated chapter. The final chapter summarizes the main techniques presented in the book and their interrelation, then explores beyond state-of-the-art modelling techniques relying on more integrated approaches. Covers neutron transport, fluid dynamics, and heat transfer, and their interdependence, in one reference Analyses the emerging area of multi-physics and multi-scale reactor modelling Contains 71 short videos explaining the key concepts and 77 interactive quizzes allowing the readers to test their understanding

Nuclear Reactor Multiphysics Via Bond Graph Formalism

Nuclear Reactor Multiphysics Via Bond Graph Formalism
A Book

by Eugeny Sosnovsky,Massachusetts Institute of Technology. Department of Nuclear Science and Engineering

  • Publisher : Unknown Publisher
  • Release : 2014
  • Pages : 216
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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This work proposes a simple and effective approach to modeling nuclear reactor multiphysics problems using bond graphs. Conventional multiphysics simulation paradigms normally use operator splitting, which treats the individual physics separately and exchanges the information at every time step. This approach has limited accuracy, and so recently, there has been an increased interest in fully coupled physics simulation. The bond graph formalism has recently been suggested as a potential paradigm for reactor multiphysics simulation; this work develops the tools necessary to utilize bond graphs for practical transient reactor analysis. The bond graph formalism was first introduced to solve the multiphysics problem in electromechanical systems. Over the years, it has been used in many fields including nuclear engineering, but with limited scope due to its perceived impracticality in large systems. Bond graph formalism works by first representing a discretized multiphysics system using a group of graph elements, connected with bonds; the bonds transport conserved quantities, and the elements impose the relations between them. The representation can be automatically converted into a state derivative vector, which can be integrated in time. In an earlier work, the bond graph formalism was first applied to neutron diffusion, and coupled to diffusive heat transfer in a 1D slab reactor. In this work, methods are developed to represent, using bond graphs, 2D and 3D multigroup neutron diffusion with precursors, nonlinear point kinetics, and basic nearly-incompressible 1D flow for fully coupled reactor simulation. High-performance, matrix-based bond graph processing methods were developed to support the simulation of medium- and large-scale problems. A pressurized water reactor point kinetics, single-channel rod ejection benchmark problem was used to verify the nonlinear point kinetics representation. 2D and 3D boiling water reactor control blade drop problems were also successfully simulated with the matrix-based bond graph processing code. The code demonstrated 3rd-order convergence in time, a very desirable property of fully coupled time integrators.

Issues in Water and Power Engineering: 2013 Edition

Issues in Water and Power Engineering: 2013 Edition
A Book

by Anonim

  • Publisher : ScholarlyEditions
  • Release : 2013-05-01
  • Pages : 765
  • ISBN : 1490108327
  • Language : En, Es, Fr & De
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Issues in Water and Power Engineering / 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Fusion Engineering. The editors have built Issues in Water and Power Engineering: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Fusion Engineering in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Water and Power Engineering: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Particle Methods for Multi-Scale and Multi-Physics

Particle Methods for Multi-Scale and Multi-Physics
A Book

by M B Liu,G R Liu

  • Publisher : World Scientific
  • Release : 2015-12-28
  • Pages : 400
  • ISBN : 9814571717
  • Language : En, Es, Fr & De
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Multi-scale and multi-physics modeling is useful and important for all areas in engineering and sciences. Particle Methods for Multi-Scale and Multi-Physics systematically addresses some major particle methods for modeling multi-scale and multi-physical problems in engineering and sciences. It contains different particle methods from atomistic scales to continuum scales, with emphasis on molecular dynamics (MD), dissipative particle dynamics (DPD) and smoothed particle hydrodynamics (SPH). This book covers the theoretical background, numerical techniques and many interesting applications of the particle methods discussed in this text, especially in: micro-fluidics and bio-fluidics (e.g., micro drop dynamics, movement and suspension of macro-molecules, cell deformation and migration); environmental and geophysical flows (e.g., saturated and unsaturated flows in porous media and fractures); and free surface flows with possible interacting solid objects (e.g., wave impact, liquid sloshing, water entry and exit, oil spill and boom movement). The presented methodologies, techniques and example applications will benefit students, researchers and professionals in computational engineering and sciences. Contents:IntroductionMolecular DynamicsDissipative Particle Dynamics — MethodologyDissipative Particle Dynamics — ApplicationsSmoothed Particle Hydrodynamics — MethodologySmoothed Particle Hydrodynamics — ApplicationsThree Typical Particle Methods Readership: Undergraduates, graduates, researchers, and professionals studying/dealing with fluid mechanics, numerical analysis and computational mathematics, engineering mechanics, ocean engineering, mechanical engineering. Key Features:The authors have many years of experience in meshfree and particle methods, and are renowned scientists in related areas, with highly cited publications. This can greatly attracts fellow researchers from all around the world to probe the latest development on current major particle methodsThe authors have authored numerous technical publications, and many popular books. They truly understand what the fellow researchers think and wantThe authors have extensive network in academics and research. It is comparatively easy to introduce the book to professional organizations, international conferences, and different academic bodies such as universities and research institutesKeywords:Computer Modeling;Numerical Methods;Meshfree Particle Methods;Smoothed Particle Hydrodynamics;Dissipative Particle Dynamics;Molecular Dynamics

Nuclear News

Nuclear News
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2006
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Nuclear Power Plant Design and Analysis Codes

Nuclear Power Plant Design and Analysis Codes
Development, Validation, and Application

by Jun Wang,Xin Li,Chris Allison,Judy Hohorst

  • Publisher : Woodhead Publishing
  • Release : 2020-11-10
  • Pages : 608
  • ISBN : 0128181915
  • Language : En, Es, Fr & De
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Nuclear Power Plant Design and Analysis Codes: Development, Validation, and Application presents the latest research on the most widely used nuclear codes and the wealth of successful accomplishments which have been achieved over the past decades by experts in the field. Editors Wang, Li,Allison, and Hohorst and their team of authors provide readers with a comprehensive understanding of nuclear code development and how to apply it to their work and research to make their energy production more flexible, economical, reliable and safe. Written in an accessible and practical way, each chapter considers strengths and limitations, data availability needs, verification and validation methodologies and quality assurance guidelines to develop thorough and robust models and simulation tools both inside and outside a nuclear setting. This book benefits those working in nuclear reactor physics and thermal-hydraulics, as well as those involved in nuclear reactor licensing. It also provides early career researchers with a solid understanding of fundamental knowledge of mainstream nuclear modelling codes, as well as the more experienced engineers seeking advanced information on the best solutions to suit their needs. Captures important research conducted over last few decades by experts and allows new researchers and professionals to learn from the work of their predecessors Presents the most recent updates and developments, including the capabilities, limitations, and future development needs of all codes Incudes applications for each code to ensure readers have complete knowledge to apply to their own setting.

Los Alamos Science

Los Alamos Science
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2003
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Multi-physics Approach to the Modelling and Analysis of Molten Salt Reactors

Multi-physics Approach to the Modelling and Analysis of Molten Salt Reactors
A Book

by Lelio Luzzi,Valentino Di Marcello,Antonio Cammi

  • Publisher : Nova Novinka
  • Release : 2012
  • Pages : 140
  • ISBN : 9781614700005
  • Language : En, Es, Fr & De
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Multi-Physics Modelling (MPM) is an innovative simulation technique that looks very promising for the employment in the field of nuclear engineering as an integrative analysis support in the design development of current and innovative nuclear reactors. This book presents a Multi-Physics Modelling (MPM) approach to the analysis of nuclear reactor core behaviour, developed to study the coupling between neutronics and thermo-hydrodynamics. Reference is made to the Molten Salt Reactor, one of the innovative nuclear systems under development in the framework of the Generation IV International Forum, but the same methodology can be applied to other reactor systems.

Tally Derivative Based Surrogate Models for Faster Monte Carlo Multiphysics

Tally Derivative Based Surrogate Models for Faster Monte Carlo Multiphysics
A Book

by Sterling M. Harper

  • Publisher : Unknown Publisher
  • Release : 2020
  • Pages : 231
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Existing neutron transport methods used in the nuclear power industry rely on a complex toolchain of modeling and simulation software. Each link in this chain applies various approximations to the spatial, angular, and energy distributions of the problem variables; and these approximations can limit solver predictive capabilities. Monte Carlo (MC) neutron transport is a high-fidelity method that can relax many of these approximations and possibly replace much of the existing toolchain. However, MC neutron transport is also very slow, particularly when coupled into a multiphysics solver. Some researchers have published runtime costs of over 100 000 cpuhours to converge a quarter-core multiphysics problem with MC -- an expense which makes MC-based tools prohibitive for regular use. In response to this issue, some researchers have developed acceleration techniques using the diffusion-based CMFD (coarse mesh finite difference) method. This thesis extends that work by coupling the CMFD solver directly to the thermalhydraulics solvers in a multiphysics simulation. To enable this coupling, MC differential tallies are used to compute the feedback dependence of CMFD parameters. Novel methods based on the windowed multipole cross section representation are used to compute fuel temperature derivatives along with coolant density derivatives. This differential tally approach proves to be flexible; the same procedure is applied to each coarse mesh cell regardless of the presence of control rods, burnable poisons, spacer grids, 135Xe, or other details of the MC model. With the inclusion of a simple pin power reconstruction scheme, these methods create a surrogate neutronics solver capable of bi-directional coupling with thermal-hydraulics. This surrogate can then accelerate multiphysics convergence by reducing the reliance on costly MC simulations. Furthermore, a novel source-weight clipping procedure is introduced to damp MCCMFD instabilities. Because this clipping procedure does not require multiple MC generations, CMFD and multiphysics coupling can be performed after each MC generation -- even the first generation. This allows simulations to be run with very few MC generations, a feature which alleviates the cost of using many neutrons per MC generation to reduce the impact of fission source distribution undersampling. This methodology is tested on a quarter-core model of the BEAVRS benchmark, a large pressurized water reactor. Simplified subchannel fluid dynamics, fuel pin heat transfer, and equilibrium xenon solvers are included to form a multiphysics system. Without the presented acceleration methods, these quarter-core multiphysics simulations using 200 million neutrons per generation are projected to require 3 300 cpu core-hours to reach stationarity. With the presented methods, this cost falls to 270 core-hours. Further results are shown to demonstrate the runtime costs needed to tightly resolve fine-mesh power distributions with projected runtime savings of 6× over prior work.

Transactions of the American Nuclear Society

Transactions of the American Nuclear Society
A Book

by American Nuclear Society

  • Publisher : Unknown Publisher
  • Release : 1958
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Each volume contains proceedings of the annual conference of the American Nuclear Society.

Multiphysics Modelling of Fluid‐Particulate Systems

Multiphysics Modelling of Fluid‐Particulate Systems
A Book

by Hassan Khawaja

  • Publisher : Academic Press
  • Release : 2020-03
  • Pages : 250
  • ISBN : 0128183454
  • Language : En, Es, Fr & De
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Multiphysics Modelling of Fluid-Particulate Systems provides an explanation of how to model fluid-particulate systems using Eulerian and Lagrangian methods. The computational cost and relative merits of the different methods are compared, with recommendations on where and how to apply them provided. The science underlying the fluid‐particulate phenomena involves computational fluid dynamics (for liquids and gases), computational particle dynamics (solids), and mass and heat transfer. In order to simulate these systems, it is essential to model the interactions between phases and the fluids and particles themselves. This book details instructions for several numerical methods of dealing with this complex problem. This book is essential reading for researchers from all backgrounds interested in multiphase flows or fluid-solid modeling, as well as engineers working on related problems in chemical engineering, food science, process engineering, geophysics or metallurgical processing.

Annual Report of the Faculty of Engineering, Kyushu University

Annual Report of the Faculty of Engineering, Kyushu University
A Book

by Kyūshū Daigaku. Kōgaku Kenkyūin

  • Publisher : Unknown Publisher
  • Release : 2010
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Who's who in Computational Science and Engineering

Who's who in Computational Science and Engineering
2005-2006

by Independent Publishers Group,Saxe-Coburg Publications

  • Publisher : Unknown Publisher
  • Release : 2006
  • Pages : 354
  • ISBN : 9781874672180
  • Language : En, Es, Fr & De
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The achievements and biographical details of nearly 1,500 key researchers and practitioners in the fields of computational mechanics, applied mathematics, computer science, artificial intelligence, aerospace, aeronautical, chemical, civil, environmental, mechanical, and structural engineering are included in this directory.

Multiphysics Simulations in Automotive and Aerospace Applications

Multiphysics Simulations in Automotive and Aerospace Applications
A Book

by Mojtaba Moatamedi,Thurai Rahulan,Hassan Khawaja

  • Publisher : Academic Press
  • Release : 2021-07-01
  • Pages : 270
  • ISBN : 0128179007
  • Language : En, Es, Fr & De
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Multiphysics Simulations in Automotive and Aerospace Applications provides the fundamentals and latest developments on numerical methods for solving multiphysics problems including fluid-solid interaction, fluid-structure‐thermal coupling, electromagnetic-fluid-solid coupling, vibro and aeroacoustics. Chapters describe the different algorithms and numerical methods used for solving coupled problems using implicit or explicit coupling problems from industrial or academic applications. Given the book’s comprehensive coverage, automotive and aerospace engineers, designers, graduate students and researchers involved in the simulation of practical coupling problems will find the mathematical and numerical description of the coupling algorithms they are modelling in this new volume of the Multiphysics: Advances and Applications series. Provides the fundamentals of the numerical methods and comprehensive examples for solving coupled problems Features multi-physics methods and available codes as well as what these codes can do Presents examples from industrial and academic applications

BERRU Predictive Modeling

BERRU Predictive Modeling
Best Estimate Results with Reduced Uncertainties

by Dan Gabriel Cacuci

  • Publisher : Springer
  • Release : 2018-12-29
  • Pages : 451
  • ISBN : 366258395X
  • Language : En, Es, Fr & De
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This book addresses the experimental calibration of best-estimate numerical simulation models. The results of measurements and computations are never exact. Therefore, knowing only the nominal values of experimentally measured or computed quantities is insufficient for applications, particularly since the respective experimental and computed nominal values seldom coincide. In the author’s view, the objective of predictive modeling is to extract “best estimate” values for model parameters and predicted results, together with “best estimate” uncertainties for these parameters and results. To achieve this goal, predictive modeling combines imprecisely known experimental and computational data, which calls for reasoning on the basis of incomplete, error-rich, and occasionally discrepant information. The customary methods used for data assimilation combine experimental and computational information by minimizing an a priori, user-chosen, “cost functional” (usually a quadratic functional that represents the weighted errors between measured and computed responses). In contrast to these user-influenced methods, the BERRU (Best Estimate Results with Reduced Uncertainties) Predictive Modeling methodology developed by the author relies on the thermodynamics-based maximum entropy principle to eliminate the need for relying on minimizing user-chosen functionals, thus generalizing the “data adjustment” and/or the “4D-VAR” data assimilation procedures used in the geophysical sciences. The BERRU predictive modeling methodology also provides a “model validation metric” which quantifies the consistency (agreement/disagreement) between measurements and computations. This “model validation metric” (or “consistency indicator”) is constructed from parameter covariance matrices, response covariance matrices (measured and computed), and response sensitivities to model parameters. Traditional methods for computing response sensitivities are hampered by the “curse of dimensionality,” which makes them impractical for applications to large-scale systems that involve many imprecisely known parameters. Reducing the computational effort required for precisely calculating the response sensitivities is paramount, and the comprehensive adjoint sensitivity analysis methodology developed by the author shows great promise in this regard, as shown in this book. After discarding inconsistent data (if any) using the consistency indicator, the BERRU predictive modeling methodology provides best-estimate values for predicted parameters and responses along with best-estimate reduced uncertainties (i.e., smaller predicted standard deviations) for the predicted quantities. Applying the BERRU methodology yields optimal, experimentally validated, “best estimate” predictive modeling tools for designing new technologies and facilities, while also improving on existing ones.

Introduction to Transport Phenomena Modeling

Introduction to Transport Phenomena Modeling
A Multiphysics, General Equation-Based Approach

by Gianpaolo Ruocco

  • Publisher : Springer
  • Release : 2018-02-12
  • Pages : 284
  • ISBN : 3319668226
  • Language : En, Es, Fr & De
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This textbook offers an introduction to multiple, interdependent transport phenomena as they occur in various fields of physics and technology like transport of momentum, heat, and matter. These phenomena are found in a number of combined processes in the fields of chemical, food, biomedical, and environmental sciences. The book puts a special emphasis on numerical modeling of both purely diffusive mechanisms and macroscopic transport such as fluid dynamics, heat and mass convection. To favor the applicability of the various concepts, they are presented with a simplicity of exposure, and synthesis has been preferred with respect to completeness. The book includes more than 130 graphs and figures, to facilitate the understanding of the various topics. It also presents many modeling examples throughout the text, to control that the learned material is properly understood.

Fusion Neutronics

Fusion Neutronics
A Book

by Yican Wu

  • Publisher : Springer
  • Release : 2017-08-16
  • Pages : 393
  • ISBN : 981105469X
  • Language : En, Es, Fr & De
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This book provides a systematic and comprehensive introduction to fusion neutronics, covering all key topics from the fundamental theories and methodologies, as well as a wide range of fusion system designs and experiments. It is the first-ever book focusing on the subject of fusion neutronics research. Compared with other nuclear devices such as fission reactors and accelerators, fusion systems are normally characterized by their complex geometry and nuclear physics, which entail new challenges for neutronics such as complicated modeling, deep penetration, low simulation efficiency, multi-physics coupling, etc. The book focuses on the neutronic characteristics of fusion systems and introduces a series of theories and methodologies that were developed to address the challenges of fusion neutronics. Further, it introduces readers to the unique principles and procedures of neutronics design, experimental methodologies and methodologies for fusion systems. The book not only highlights the latest advances and trends in the field, but also draws on the experiences and skills collected in the author’s more than 40 years of research. To make it more accessible and enhance its practical value, various representative examples are included to illustrate the application and efficiency of the methods, designs and experimental techniques discussed.

SciDAC 2007

SciDAC 2007
24-28 June 2007, Boston Massachusetts, USA

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2007
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Publications in Engineering

Publications in Engineering
PIE : Publications Abstracted and Indexed in the ... Engineering Information Databases

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2002
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Mechatronics and Industrial Informatics

Mechatronics and Industrial Informatics
A Book

by Prasad Yarlagadda,Yun Hae Kim

  • Publisher : Trans Tech Publications Ltd
  • Release : 2013-06-13
  • Pages : 3300
  • ISBN : 3038260754
  • Language : En, Es, Fr & De
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This volume records the accepted papers of 2013 International Conference on Mechatronics and Industrial Informatics (ICMII 2013) which took place in Guangzhou, China between 30-31 March 2013. Volume is indexed by Thomson Reuters CPCI-S (WoS). The papers are grouped as follows: Chapter 1: Theory of Mechanisms and Mechanical Engineering, Dynamics of System Applications; Chapter 2: Materials Research, Manufacturing Technologies in Materials; Chapter 3: Electronics and Microelectronics Technology; Chapter 4: Optoelectronic Devices and Technology; Chapter 5: Sensors and Information Fusion Technology; Chapter 6: Measurement Technology and Instruments; Chapter 7: Modeling and Simulation Technology of Systems; Chapter 8: Voice, Image and Video Processing; Chapter 9: Signal Processing Systems Design and Implementation; Chapter 10: Power Engineering and Automation; Chapter 11: Industrial Robotics and Automation; Chapter 12: Vehicle Control Systems; Chapter 13: Design and Control in Modern System Engineering and Mechatronics; Chapter 14: Intelligent Control, Structural Engineering Analysis, CAD Optimized Design; Chapter 15: Artificial Intelligence Techniques; Chapter 16: Intelligent Optimization Algorithms and Applications; Chapter 17: Computer Information Processing Technology; Chapter 18: Industrial Informatics and Applications; Chapter 19: Database System; Chapter 20: Information Security; Chapter 21: Computer Networks and Communication; Chapter 22: Software Engineering; Chapter 23: E-Commerce/E-Government; Chapter 24: Engineering Management and Engineering Education