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Analysis and Design of Geotechnical Structures
by Manuel Matos FernandesAnalysis and design of geotechnical structures combines, in a single endeavor, a textbook to assist students in understanding the behavior of the main geotechnical works and a guide for practising geotechnical engineers, designers, and consultants. The subjects are treated in line with limit state design, which underpins the Eurocodes and most North America design codes. Instructors and students will value innovative approaches to numerous issues refined by the experience of the author in teaching generations of enthusiastic students. Professionals will gain from its comprehensive treatment of the topics covered in each chapter, supplemented by a plethora of informative material used by consultants and designers. For the benefit of both academics and professionals, conceptual exercises and practical geotechnical design problems are proposed at the end of most chapters. A final annex includes detailed resolutions of the exercises and problems.
Analysis and Design of Gravity Flow Conduits and Buried Bridges
by Timothy J. McGrathThis book covers the structural analysis and design of buried gravity flow conduits, including traditional pipes, arches, box conduits, and buried bridges with spans up to 80 ft (25 m) and greater. The text primarily covers concrete, corrugated metal, and plastic conduits but is generally applicable to other materials. Applications include culverts, storm drains, sewers, and pedestrian and vehicular crossings.The book is intended to introduce the subject to practitioners new to the field, as well as provide detailed information for those with prior experience. The opening chapter presents historical background and basic design models to introduce important concepts and then follows with chapters devoted to materials, soils, soil-conduit interaction, and guidance on the use of finite elements for analysis. Then design methods for evaluating soil-conduit systems are presented, along with guidance on important considerations during installation. The book concludes with field experiences of when things went wrong and why.Analysis and Design of Gravity Flow Conduits and Buried Bridges offers a unified and comprehensive guide for practicing engineers working on buried pipe design, private consultants, and product manufacturers, as well as researchers in the area.
Analysis and Design of Heating, Ventilating, and Air-Conditioning Systems, Second Edition
by Herbert W. Stanford III Adam F. SpachAnalysis and Design of Heating, Ventilating, and Air-Conditioning Systems, Second Edition, provides a thorough and modern overview of HVAC for commercial and industrial buildings, emphasizing energy efficiency. This text combines coverage of heating and air conditioning systems design with detailed information on the latest controls technologies. It also addresses the art of HVAC design along with carefully explained scientific and technical content, reflecting the extensive experience of the authors. Modern HVAC topics are addressed, including sustainability, IAQ, water treatment and risk management, vibration and noise mitigation, and maintainability from a practical point of view.
The Analysis and Design of Linear Circuits
by Roland E. Thomas Albert J. Rosa Gregory J. ToussaintTHE ANALYSIS AND DESIGN OF LINEAR CIRCUITS Textbook covering the fundamentals of circuit analysis and design, now with additional examples, exercises, and problems The Analysis and Design of Linear Circuits, 10th Edition, taps into engineering students’ desire to explore, create, and put their learning into practice by presenting linear circuit theory, with an emphasis on circuit analysis and how to evaluate competing designs. The text integrates active and passive linear circuits, allowing students to understand and design a wide range of circuits, solve analytical problems, and devise solutions to problems. The authors use both phasors and Laplace techniques for AC circuits, enabling better understanding of frequency response, filters, AC power, and transformers. The authors have increased the integration of MATLAB® and Multisim in the text and revised content to be up-to-date with technology when appropriate. The text uses a structured pedagogy where objectives are stated in each chapter opener and examples and exercises are developed so that the students achieve mastery of each objective. The available problems revisit each objective and a suite of problems of increasing complexity task the students to check their understanding. Topics covered in The Analysis and Design of Linear Circuits, 10th Edition, include: Basic circuit analysis, including element, connection, combined, and equivalent circuits, voltage and current division, and circuit reduction Circuit analysis techniques, including node-voltage and mesh-current analysis, linearity properties, maximum signal transfer, and interface circuit design Signal waveforms, including the step, exponential, and sinusoidal waveforms, composite waveforms, and waveform partial descriptors Laplace transforms, including signal waveforms and transforms, basic properties and pairs, and pole-zero and Bode diagrams Network functions, including network functions of one- and two-port circuits, impulse response, step response, and sinusoidal response An appendix that lists typical RLC component values and tolerances along with a number of reference tables and OP AMP building blocks that are foundational for analysis and design. With an overarching goal of instilling smart judgment surrounding design problems and innovative solutions, The Analysis and Design of Linear Circuits, 10th Edition, provides inspiration and motivation alongside an essential knowledge base. The text is designed for two semesters and is complemented with robust supplementary material to enhance various pedagogical approaches, including an Instructors Manual which features an update on how to use the book to complement the 2022-23 ABET accreditation criteria, 73 lesson outlines using the new edition, additional Instructor Problems, and a Solutions Manual.
Analysis and Design of Machine Elements
by Wei JiangThis book covers the fundamental concepts, description, terminology, force analysis and methods of analysis and design. The emphasis in treating the machine elements is on methods and procedures to give students competence in applying these to mechanical components in general. The book will help students to learn to use the best available scientific understanding together with empirical information, good judgement, and ingenuity. Coverage of chain failure modes, lubrication of chain drive, timing belt pulleys, rope lay selection, wire rope manufacturing methods, effect of sheave size is included. Friction materials are discussed in detail for both wet and dry running. The design of journal bearings is thoroughly examined.
Analysis and Design of Marine Structures
by C. Guedes Soares J. RomanoffAnalysis and Design of Marine Structures includes the papers from MARSTRUCT 2013, the 4th International Conference on Marine Structures (Espoo, Finland, 25-27 March 2013). The MARSTRUCT series of conferences started in Glasgow, UK in 2007, followed by the second conference in Lisbon, Portugal (March 2009), while the third conference was held in Ham
Analysis and Design of Marine Structures: including CD-ROM
by John R. Wilson Sarah Sharples'Analysis and Design of Marine Structures' explores recent developments in methods and modelling procedures for structural assessment of marine structures:- Methods and tools for establishing loads and load effects;- Methods and tools for strength assessment;- Materials and fabrication of structures;- Methods and tools for structural design and opt
Analysis and Design of Marine Structures V
by C. Guedes Soares R. A. ShenoiAnalysis and Design of Marine Structures V contains the papers presented at MARSTRUCT 2015, the 5th International Conference on Marine Structures (Southampton, UK, 25-27 March 2015). The MARSTRUCT series of conferences started in Glasgow, UK in 2007, the second event of the series took place in Lisbon, Portugal (2009), while the third was in Hambur
Analysis and Design of Markov Jump Discrete Systems (Studies in Systems, Decision and Control #499)
by Yonggui Kao Panpan Zhang Changhong Wang Hongwei XiaThis book proposes analysis and design techniques for Markov jump systems (MJSs) using Lyapunov function and sliding mode control techniques. It covers a range of topics including stochastic stability, finite-time boundedness, actuator-fault problem, bumpless transfer scheme, and adaptive sliding mode fault-tolerant control for uncertain MJSs. Notably, the book presents a new model for deception attacks (DAs), establishing the correlation between attacks and time delays, which should be of particular interest due to the recent increase in such attacks. The book's content is presented in a comprehensive, progressive manner, with fundamental principles introduced first before addressing more advanced techniques. The book features illustrations and tables, providing readers with a practical and intuitive approach to applying these methods in their own research. This book will prove invaluable to researchers and graduate students in control engineering and applied mathematics with an interest in the latest developments in MJSs.
Analysis and Design of Networked Control Systems (Communications and Control Engineering)
by Keyou You Nan Xiao Lihua XieThis monograph focuses on characterizing the stability and performance consequences of inserting limited-capacity communication networks within a control loop. The text shows how integration of the ideas of control and estimation with those of communication and information theory can be used to provide important insights concerning several fundamental problems such as: · minimum data rate for stabilization of linear systems over noisy channels; · minimum network requirement for stabilization of linear systems over fading channels; and · stability of Kalman filtering with intermittent observations. A fundamental link is revealed between the topological entropy of linear dynamical systems and the capacities of communication channels. The design of a logarithmic quantizer for the stabilization of linear systems under various network environments is also extensively discussed and solutions to many problems of Kalman filtering with intermittent observations are demonstrated. Analysis and Design of Networked Control Systems will interest control theorists and engineers working with networked systems and may also be used as a resource for graduate students with backgrounds in applied mathematics, communications or control who are studying such systems.
Analysis and Design of Networked Control Systems under Attacks
by Fuchun Sun Yuan Yuan Hongjiu Yang Lei GuoThis book adopts a systematic view of the control systems in cyber-physical systems including the security control of the optimal control system, security control of the non-cooperative game system, quantify the impact of the Denial-of-Service attacks on the optimal control system, and the adaptive security control of the networked control systems. Because the cyber-physical system is a hybrid system, it adopts cross layer approach to handle the security control of the CPS. It presents a number of attack models according to the attack scenario and defense facilities, and a number of cross-layer co-design methodologies to secure the control of CPS.
Analysis and Design of Networks-on-Chip Under High Process Variation
by Rabab Ezz-Eldin Magdy Ali El-Moursy Hesham F. A. HamedThis book describes in detail the impact of process variations on Network-on-Chip (NoC) performance. The authors evaluate various NoC topologies under high process variation and explain the design of efficient NoCs, with advanced technologies. The discussion includes variation in logic and interconnect, in order to evaluate the delay and throughput variation with different NoC topologies. The authors describe an asynchronous router, as a robust design to mitigate the impact of process variation in NoCs and the performance of different routing algorithms is determined with/without process variation for various traffic patterns. Additionally, a novel Process variation Delay and Congestion aware Routing algorithm (PDCR) is described for asynchronous NoC design, which outperforms different adaptive routing algorithms in the average delay and saturation throughput for various traffic patterns.
Analysis and Design of Next-Generation Software Architectures: 5G, IoT, Blockchain, and Quantum Computing
by Arthur M. LangerThis book provides a detailed “how-to” guide, addressing aspects ranging from analysis and design to the implementation of applications, which need to be integrated within legacy applications and databases.The analysis and design of the next generation of software architectures must address the new requirements to accommodate the Internet of things (IoT), cybersecurity, blockchain networks, cloud, and quantum computer technologies. As 5G wireless increasingly establishes itself over the next few years, moving legacy applications into these new architectures will be critical for companies to compete in a consumer-driven and social media-based economy. Few organizations, however, understand the challenges and complexities of moving from a central database legacy architecture to a ledger and networked environment.The challenge is not limited to just designing new software applications. Indeed, the next generation needs to function more independently on various devices, and on more diverse and wireless-centric networks. Furthermore, databases must be broken down into linked list-based blockchain architectures, which will involve analytic decisions regarding which portions of data and metadata will be processed within the chain, and which ones will be dependent on cloud systems. Finally, the collection of all data throughout these vast networks will need to be aggregated and used for predictive analysis across a variety of competitive business applications in a secured environment. Certainly not an easy task for any analyst/designer!Many organizations will continue to use packaged products and open-source applications. These third-party products will need to be integrated into the new architecture paradigms and have seamless data aggregation capabilities, while maintaining the necessary cyber compliances. The book also clearly defines the roles and responsibilities of the stakeholders involved, including the IT departments, users, executive sponsors, and third-party vendors. The book’s structure also provides a step-by-step method to help ensure a higher rate of success in the context of re-engineering existing applications and databases, as well as selecting third-party products, conversion methods and cybercontrols. It was written for use by a broad audience, including IT developers, software engineers, application vendors, business line managers, and executives.
Analysis and Design of Nonlinear Systems in the Frequency Domain (Springer Theses)
by Yunpeng ZhuThis book focuses on the development of three novel approaches to build up a framework for the frequency domain analysis and design of nonlinear systems. The concepts are derived from Volterra series representation of nonlinear systems which are described by nonlinear difference or differential equations. Occupying the middle ground between traditional linear approaches and more complex nonlinear system theories, the book will help readers to have a good start to analyse and exploit the nonlinearities. Analysis and Design of Nonlinear Systems in the Frequency Domain provides clear illustrations and examples at the beginning and the end of each chapter, respectively, making it of interest to both academics and practicing engineers.
Analysis and Design of Steel and Composite Structures
by Qing Quan LiangSteel and composite steel–concrete structures are widely used in modern bridges, buildings, sport stadia, towers, and offshore structures. Analysis and Design of Steel and Composite Structures offers a comprehensive introduction to the analysis and design of both steel and composite structures. It describes the fundamental behavior of steel and composite members and structures, as well as the current design criteria and procedures given in Australian standards AS/NZS 1170, AS 4100, AS 2327.1, Eurocode 4, and AISC-LRFD specifications.Featuring numerous step-by-step examples that clearly illustrate the detailed analysis and design of steel and composite members and connections, this practical and easy-to-understand text: Covers plates, members, connections, beams, frames, slabs, columns, and beam-columns Considers bending, axial load, compression, tension, and design for strength and serviceability Incorporates the author’s latest research on composite members Analysis and Design of Steel and Composite Structures is an essential course textbook on steel and composite structures for undergraduate and graduate students of structural and civil engineering, and an indispensable resource for practising structural and civil engineers and academic researchers. It provides a sound understanding of the behavior of structural members and systems.
Analysis and Design of Steel and Composite Structures
by Qing Quan LiangSteel and composite steel–concrete structures are widely used in modern bridges, buildings, sport stadia, towers, and offshore structures. Analysis and Design of Steel and Composite Structures offers a comprehensive introduction to the analysis and design of both steel and composite structures. It describes the fundamental behavior of steel and composite members and structures, as well as the current design criteria and procedures given in Australian standards AS/NZS 1170, AS 4100, AS 2327.1, Eurocode 4, and AISC-LRFD specifications.Featuring numerous step-by-step examples that clearly illustrate the detailed analysis and design of steel and composite members and connections, this practical and easy-to-understand text: Covers plates, members, connections, beams, frames, slabs, columns, and beam-columns Considers bending, axial load, compression, tension, and design for strength and serviceability Incorporates the author’s latest research on composite members Analysis and Design of Steel and Composite Structures is an essential course textbook on steel and composite structures for undergraduate and graduate students of structural and civil engineering, and an indispensable resource for practising structural and civil engineers and academic researchers. It provides a sound understanding of the behavior of structural members and systems.
Analysis and Design of the Power-Split Device for Hybrid Systems
by Xiaohua Zeng Jixin WangThis book presents a comprehensive overview of power-split device (PSD) design. It discusses vehicle energy consumption characteristics, hybrid vehicle power request solutions, typical configurations, operating principle and simulation technology of PSD hybrid system, a multi-factor integrated parametric design method and a dynamic coordinated control method for PSD hybrid system. It also describes the finite element analysis, thermal analysis and optimization of the PSD based on a surrogate model, explains the theory behind the design and the simulation, and provides concrete examples. It is a valuable resource for researchers and the engineers to gain a better understanding of the PSD design process.
Analysis and Design of Transimpedance Amplifiers for Optical Receivers
by Eduard SäckingerAn up-to-date, comprehensive guide for advanced electrical engineering studentsand electrical engineers working in the IC and optical industries This book covers the major transimpedance amplifier (TIA) topologies and their circuit implementations for optical receivers. This includes the shunt-feedback TIA, common-base TIA, common-gate TIA, regulated-cascode TIA, distributed-amplifier TIA, nonresistive feedback TIA, current-mode TIA, burst-mode TIA, and analog-receiver TIA. The noise, transimpedance, and other performance parameters of these circuits are analyzed and optimized. Topics of interest include post amplifiers, differential vs. single-ended TIAs, DC input current control, and adaptive transimpedance. The book features real-world examples of TIA circuits for a variety of receivers (direct detection, coherent, burst-mode, etc.) implemented in a broad array of technologies (HBT, BiCMOS, CMOS, etc.). The book begins with an introduction to optical communication systems, signals, and standards. It then moves on to discussions of optical fiber and photodetectors. This discussion includes p-i-n photodetectors; avalanche photodetectors (APD); optically preamplified detectors; integrated detectors, including detectors for silicon photonics; and detectors for phase-modulated signals, including coherent detectors. This is followed by coverage of the optical receiver at the system level: the relationship between noise, sensitivity, optical signal-to-noise ratio (OSNR), and bit-error rate (BER) is explained; receiver impairments, such as intersymbol interference (ISI), are covered. In addition, the author presents TIA specifications and illustrates them with example values from recent product data sheets. The book also includes: Many numerical examples throughout that help make the material more concrete for readers Real-world product examples that show the performance of actual IC designs Chapter summaries that highlight the key points Problems and their solutions for readers who want to practice and deepen their understanding of the material Appendices that cover communication signals, eye diagrams, timing jitter, nonlinearity, adaptive equalizers, decision point control, forward error correction (FEC), and second-order low-pass transfer functions Analysis and Design of Transimpedance Amplifiers for Optical Receivers belongs on the reference shelves of every electrical engineer working in the IC and optical industries. It also can serve as a textbook for upper-level undergraduates and graduate students studying integrated circuit design and optical communication.
Analysis and Design Optimization of Micromixers (SpringerBriefs in Applied Sciences and Technology)
by Arshad Afzal Kwang-Yong KimThis book illustrates the computational framework based on knowledge of flow and mass transfer together with optimization techniques to solve problems relevant to micromixing technology. The authors provide a detailed analysis of the different numerical techniques applied to the design of micromixers. Flow and mixing analysis is based on both the Eulerian and Lagrangian approaches; relative advantages and disadvantages of the two methods and suitability to different types of mixing problems are analysed. The book also discusses the various facets of numerical schemes subjected to discretization errors and computational grid requirements. Since a large number of studies are based on commercial computational fluid dynamics (CFD) packages, relevant details of these packages to the mixing problem using them are presented. Numerical optimization techniques coupled with CFD analysis of flow and mixing have proved to be an important tool for micromixers design, and therefore, are an important part of the book. These techniques are presented briefly, and focus is on surrogate modeling and optimization applied to design of micromixers.
Analysis and Development of Sustainable Urban Production Systems (Sustainable Production, Life Cycle Engineering and Management)
by Max JuraschekManufacturing of products in urban production sites is connected to unique potentials, yet also to specific challenges. Urban factories can provide functional diversity and contribute positive impacts to a city. The concept of urban production receives rising attention in research and industry and it is recognized in its interdisciplinary nature. With a holistic approach from both the urban perspective and the factory perspective, negative impacts can be minimized, positive effects enabled and mutually beneficial, symbiotic combinations created. The presented framework and methods for the evaluation and implementation of sustainable urban production systems allow the assessment of impacts and provide the means to control and utilize the unique strengths of urban factories for cities and industry. This will allow a structured derivation of methods and measures from the concept of urban production for producing enterprises and the urban stakeholders.
The Analysis and Geometry of Hardy's Inequality
by Alexander A. Balinsky W. Desmond Evans Roger T. LewisThis volume presents advances that have been made over recent decades in areas of research featuring Hardy's inequality and related topics. The inequality and its extensions and refinements are not only of intrinsic interest but are indispensable tools in many areas of mathematics and mathematical physics. Hardy inequalities on domains have a substantial role and this necessitates a detailed investigation of significant geometric properties of a domain and its boundary. Other topics covered in this volume are Hardy- Sobolev-Maz'ya inequalities; inequalities of Hardy-type involving magnetic fields; Hardy, Sobolev and Cwikel-Lieb-Rosenbljum inequalities for Pauli operators; the Rellich inequality. The Analysis and Geometry of Hardy's Inequality provides an up-to-date account of research in areas of contemporary interest and would be suitable for a graduate course in mathematics or physics. A good basic knowledge of real and complex analysis is a prerequisite.
Analysis and Implementation of Isogeometric Boundary Elements for Electromagnetism (Springer Theses)
by Felix WolfThis book presents a comprehensive mathematical and computational approach for solving electromagnetic problems of practical relevance, such as electromagnetic scattering and the cavity problems. After an in-depth introduction to the mathematical foundations of isogeometric analysis, which discusses how to conduct higher-order simulations efficiently and without the introduction of geometrical errors, the book proves quasi-optimal approximation properties for all trace spaces of the de Rham sequence, and demonstrates inf-sup stability of the isogeometric discretisation of the electric field integral equation (EFIE). Theoretical properties and algorithms are described in detail. The algorithmic approach is, in turn, validated through a series of numerical experiments aimed at solving a set of electromagnetic scattering problems. In the last part of the book, the boundary element method is combined with a novel eigenvalue solver, a so-called contour integral method. An algorithm is presented, together with a set of successful numerical experiments, showing that the eigenvalue solver benefits from the high orders of convergence offered by the boundary element approach. Last, the resulting software, called BEMBEL (Boundary Element Method Based Engineering Library), is reviewed: the user interface is presented, while the underlying design considerations are explained in detail. Given its scope, this book bridges an important gap between numerical analysis and engineering design of electromagnetic devices.
Analysis and Management of Productivity and Efficiency in Production Systems for Goods and Services
by Fabio Sartori Piran Daniel Pacheco Lacerda Luis Felipe CamargoIn companies that produce goods and services, productivity and efficiency improvements are a constant challenge. This book reviews the differences between productivity and efficiency. It proposes a new method and makes available a computational tool for implementation that contributes to facilitating the use of Data Envelopment Analysis (DEA). The book presents a discussion about productivity and efficiency, illustrating the potentials of use and conceptual differences. It covers the concepts and techniques for analysis of productivity and efficiency, analyzing critical benefits and limitations, explains in detail how to use DEA for analysis, provides innovative methods for using DEA, offers a free online computer tool with a direction guide, shows real empirical applications, and covers other techniques that can be used to complement the analysis performed. The book is for professionals, managers, consultants, students working and taking courses in productive systems of goods and services. Ancillary materials include a free online computer tool to operationalize the concepts and methods proposed in the book, a guide on how to use the method and the software developed for the DEA application. Solutions manual, instructor’s manual, PowerPoint slides, and figure slides also will be available upon qualified adoption.
Analysis and Mathematical Models of Canned Electrical Machine Drives: In Particular a Canned Switched Reluctance Machine
by Qiang Yu Xuesong Wang Yuhu Cheng Lisi TianThis book focuses on the electromagnetic and thermal modeling and analysis of electrical machines, especially canned electrical machines for hydraulic pump applications. It addresses both the principles and engineering practice, with more weight placed on mathematical modeling and theoretical analysis. This is achieved by providing in-depth studies on a number of major topics such as: can shield effect analysis, machine geometry optimization, control analysis, thermal and electromagnetic network models, magneto motive force modeling, and spatial magnetic field modeling. For the can shield effect analysis, several cases are studied in detail, including classical canned induction machines, as well as state-of-the-art canned permanent magnet machines and switched reluctance machines. The comprehensive and systematic treatment of the can effect for canned electrical machines is one of the major features of this book, which is particularly suited for readers who are interested in learning about electrical machines, especially for hydraulic pumping, deep-sea exploration, mining and the nuclear power industry. The book offers a valuable resource for researchers, engineers, and graduate students in the fields of electrical machines, magnetic and thermal engineering, etc.
Analysis and Mitigation of Broadband Oscillation in Renewable Energy Generation and AC/DC Transmission Systems
by Weisheng Wang Guanghui Li Guoqing HeWith the growth of the installed capacity and the proportion of REG, mainly including wind power and PV power generation, the stable operation of REG and AC/DC transmission systems has become a technical bottleneck for the sustainable development of REG. Since 2009, broadband oscillation incidents have occurred frequently in REG and AC/DC transmission systems in China and some foreign countries, resulting in severe consequences such as large-scale tripping-off of REG units, damaging equipments, and an increasing curtailment of wind and PV power generation. However, there are great difficulties and challenges for the analysis and mitigation of broadband oscillation.This book focuses on the analysis and mitigation of broadband oscillation in renewable energy generation and AC/DC transmission systems. The theoretical knowledge and practical approaches to solve this issue are explored through the contents of 4 parts, 18 chapters. Part Ⅰ is Small-signal Modeling of Converters, containing four chapters. The frequency-domain small-signal modeling method and impedance modeling of three types of basic converters commonly used in power electronic devices, including the two-level converter, modular multilevel converter, and thyristor converter are introduced. Part Ⅱ is Impedance Model and Characteristics Analysis of REG and HVDC Transmission, containing six chapters. The impedance model and characteristics analysis of the full power conversion wind turbine, DFIG-based wind turbines, PV unit, SVG, LCC-HVDC, and MMC-HVDC are introduced. Part Ⅲ is Broadband Oscillation Analysis in REG and AC/DC Transmission Systems, containing three chapters. The impedance modeling and characteristics analysis of REG plants, and oscillation analysis of REG connected into AC and HVDC transmission systems are introduced. Part Ⅳ is Broadband Oscillation Mitigation in REG and AC/DC Transmission Systems, containing five chapters. The impedance reshaping of the REG unit, SVG, LCC-HVDC, and MMC-HVDC as well as project cases are presented.This book can be used by the researchers engaged in the design, technology research and development, and operation management of electrical engineering and renewable energy engineering, which can also be a reference book for teachers and students of electrical engineering in colleges and universities.