Encyclopedia Of Alternative And Renewable Energy Volume 14

Download Encyclopedia Of Alternative And Renewable Energy Volume 14 full books in PDF, epub, and Kindle. Read online Encyclopedia Of Alternative And Renewable Energy Volume 14 ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

Alternative Energy and Shale Gas Encyclopedia

Download Alternative Energy and Shale Gas Encyclopedia PDF Online Free

Author : Jay H. Lehr
Publisher : John Wiley & Sons
ISBN 13 : 1119066336
Total Pages : 910 pages
Book Rating : 4.1/5 (19 download)

Book Synopsis Alternative Energy and Shale Gas Encyclopedia by : Jay H. Lehr

Download or read book Alternative Energy and Shale Gas Encyclopedia written by Jay H. Lehr and published by John Wiley & Sons. This book was released on 2016-04-20 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive depository of all information relating to the scientific and technological aspects of Shale Gas and Alternative Energy Conveniently arranged by energy type including Shale Gas, Wind, Geothermal, Solar, and Hydropower Perfect first-stop reference for any scientist, engineer, or student looking for practical and applied energy information Emphasizes practical applications of existing technologies, from design and maintenance, to operating and troubleshooting of energy systems and equipment Features concise yet complete entries, making it easy for users to find the required information quickly, without the need to search through long articles

Encyclopedia of Renewable Energy, Sustainability and the Environment

Download Encyclopedia of Renewable Energy, Sustainability and the Environment PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0323939414
Total Pages : 4061 pages
Book Rating : 4.3/5 (239 download)

Book Synopsis Encyclopedia of Renewable Energy, Sustainability and the Environment by :

Download or read book Encyclopedia of Renewable Energy, Sustainability and the Environment written by and published by Elsevier. This book was released on 2024-08-09 with total page 4061 pages. Available in PDF, EPUB and Kindle. Book excerpt: Encyclopedia of Renewable Energy, Sustainability and the Environment, Four Volume Set comprehensively covers all renewable energy resources, including wind, solar, hydro, biomass, geothermal energy, and nuclear power, to name a few. In addition to covering the breadth of renewable energy resources at a fundamental level, this encyclopedia delves into the utilization and ideal applications of each resource and assesses them from environmental, economic, and policy standpoints. This book will serve as an ideal introduction to any renewable energy source for students, while also allowing them to learn about a topic in more depth and explore related topics, all in a single resource.Instructors, researchers, and industry professionals will also benefit from this comprehensive reference. - Covers all renewable energy technologies in one comprehensive resource - Details renewable energies' processes, from production to utilization in a single encyclopedia - Organizes topics into concise, consistently formatted chapters, perfect for readers who are new to the field - Assesses economic challenges faced to implement each type of renewable energy - Addresses the challenges of replacing fossil fuels with renewables and covers the environmental impacts of each renewable energy

Microgrids

Download Microgrids PDF Online Free

Author : Sanjeevikumar Padmanaban
Publisher : CRC Press
ISBN 13 : 1000226891
Total Pages : 94 pages
Book Rating : 4.0/5 (2 download)

Book Synopsis Microgrids by : Sanjeevikumar Padmanaban

Download or read book Microgrids written by Sanjeevikumar Padmanaban and published by CRC Press. This book was released on 2020-11-24 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microgrids offers a complete discussion and details about microgrids and their applications, including modeling of AC/DC and hybrid grids in a tied mode with simulation for the solar systems, wind turbines, biomass and fuel cells, and deployment issues. The data communications and control mechanism implementations are analyzed for proper coordination of the AC/DC microgrid. The various real-time applications and future development of the microgrid are also discussed in this book, with MATLAB®-based simulations and results. This book: Discusses the fundamentals of microgrids, the components of microgrids, the modeling of renewable energy sources, and the implementation of microgrids. Explores AC and DC microgrid modeling with real-time examples. Examines the effective extraction of energy from renewable energy sources. Covers analysis of data communications and control-mechanism implementations. Includes HOMER/MATLAB®-based simulations and results on microgrids. This book would be a welcome addition to the libraries of researchers, senior undergraduate students, and graduate students in power and electrical engineering, especially those working with smart and microgrids.

Handbook of Renewable Energy Technology

Download Handbook of Renewable Energy Technology PDF Online Free

Author : Ahmed F. Zobaa
Publisher : World Scientific
ISBN 13 : 981428906X
Total Pages : 874 pages
Book Rating : 4.8/5 (142 download)

Book Synopsis Handbook of Renewable Energy Technology by : Ahmed F. Zobaa

Download or read book Handbook of Renewable Energy Technology written by Ahmed F. Zobaa and published by World Scientific. This book was released on 2011 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, consisting a series of papers written by experts in their respective fields of specialization, will provide a comprehensive coverage of renewable energy technologies, such as wind, wave and solar thermal energy. Other industrial terms like photovoltaic systems, biomass, distributed generations and small hydro power systems are also discussed and further elaborated upon. The Handbook of Renewable Energy Technology will be of great practical benefit to professionals, scientists and researchers in the relevant industries, and will be of interest to those of the general public wanting to know more about renewable energy technologies.

Green Approach to Alternative Fuel for a Sustainable Future

Download Green Approach to Alternative Fuel for a Sustainable Future PDF Online Free

Author : Maulin P. Shah
Publisher : Elsevier
ISBN 13 : 0128243198
Total Pages : 526 pages
Book Rating : 4.1/5 (282 download)

Book Synopsis Green Approach to Alternative Fuel for a Sustainable Future by : Maulin P. Shah

Download or read book Green Approach to Alternative Fuel for a Sustainable Future written by Maulin P. Shah and published by Elsevier. This book was released on 2023-05-14 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green Approach on Alternative Fuel for Sustainable Future addresses the advancement of biological and biochemical technologies in context to alternative fuel synthesis. This book emphasizes and discusses the technology involved and development on the status of alternative fuel production and related aspects, including biofuel production. The potential uses of waste material to turn them into wealth, as alternative energy sources also been discussed. The extended and detailed content of the book also covers the promising uses of microalgae treatment to produce biofuel. By not being limited to the biological aspect the book also discusses and explores the perspective of green chemistry for energy production. By adding policy and commercialization, the book provides comprehensive information, from lab to field, with extensive illustrations, case studies, summary tables and up-to-date references. - Gives an overall overview on general and applied aspects on biofuels - Provides scientific methodology for viable sustainable transition strategies for policy makers - Outlines green technologies to face the environmental crisis and allow for the transformation into a sustainable future - Provides data-based information in context to advance and innovative technology - Explore possibilities and limitation of expansion and commercialization of biofuels - Offers accumulation of innovative approach to promoting sustainable development - Includes cutting-edge research concepts for biofuels production

Alternative Energy Resources

Download Alternative Energy Resources PDF Online Free

Author : Pankaj Pathak
Publisher : Springer Nature
ISBN 13 : 3030579239
Total Pages : 326 pages
Book Rating : 4.0/5 (35 download)

Book Synopsis Alternative Energy Resources by : Pankaj Pathak

Download or read book Alternative Energy Resources written by Pankaj Pathak and published by Springer Nature. This book was released on 2021-01-04 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews alternative and renewable energy resources in order to pave the way for a more sustainable production in the future. A multi-disciplinary team of authors provides a comprehensive overview of current technologies and future trends, including solar technologies, wind energy, hydropower, microbial electrochemical systems and various biomass sources for biofuel production. In addition, the book focuses on solutions for developing countries. Conventional energy sources are finite, and estimates suggest that they will be exhausted within a few decades. Finding a solution to this problem is a global challenge, and developing countries in particular are still highly dependent on fossil fuels due to their rapidly growing populations accompanied by a huge growth in primary energy consumption. Moreover, the most common conventional energy sources (coal and petroleum) are non-sustainable since their combustion exponentially increases greenhouse gas emissions. As such, there is a pressing need for clean energy based on alternative or renewable resources, not only to ensure energy supplies at an affordable price but also to protect the environment.

Biorefineries: A Step Towards Renewable and Clean Energy

Download Biorefineries: A Step Towards Renewable and Clean Energy PDF Online Free

Author : Pradeep Verma
Publisher : Springer Nature
ISBN 13 : 9811595933
Total Pages : 623 pages
Book Rating : 4.8/5 (115 download)

Book Synopsis Biorefineries: A Step Towards Renewable and Clean Energy by : Pradeep Verma

Download or read book Biorefineries: A Step Towards Renewable and Clean Energy written by Pradeep Verma and published by Springer Nature. This book was released on 2021-01-04 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive account of past, present and future of the biomass based biorefineries. It is an all-inclusive and insightful compilation of recent advancements in the technology and methods used for conversion of biomass to bioenergy and other useful biochemicals. The book also focuses on the limitations of existing technologies and provides the future prospects, as well as discusses socio-economic impact of biomass based biorefineries. This book assists researchers in the area of lignocellulosic biorefineries and can be used by the students, scientist and academician as an advanced reference textbook.

Fundamentals and Source Characteristics of Renewable Energy Systems

Download Fundamentals and Source Characteristics of Renewable Energy Systems PDF Online Free

Author : Radian Belu
Publisher : CRC Press
ISBN 13 : 1000439186
Total Pages : 421 pages
Book Rating : 4.0/5 (4 download)

Book Synopsis Fundamentals and Source Characteristics of Renewable Energy Systems by : Radian Belu

Download or read book Fundamentals and Source Characteristics of Renewable Energy Systems written by Radian Belu and published by CRC Press. This book was released on 2019-09-10 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers comprehensive methods in analysis, characterization, and assessment of the major renewable energy sources Introduces in theoretical concepts and principles of major renewable energy conversion systems in a manner that is easily digestible by junior students, beginners in the field, engineers, and renewable energy practitioners Introduces key concepts of design and modeling methods and techniques used in renewable energy generation Presents the most common direct applications of major renewable energy systems Includes many solved examples and end-of-chapter questions and problems, helping readers to understand the theory and concepts

Energy Storage, Grid Integration, Energy Economics, and the Environment

Download Energy Storage, Grid Integration, Energy Economics, and the Environment PDF Online Free

Author : Radian Belu
Publisher : CRC Press
ISBN 13 : 1000449025
Total Pages : 331 pages
Book Rating : 4.0/5 (4 download)

Book Synopsis Energy Storage, Grid Integration, Energy Economics, and the Environment by : Radian Belu

Download or read book Energy Storage, Grid Integration, Energy Economics, and the Environment written by Radian Belu and published by CRC Press. This book was released on 2019-09-27 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book covers energy storage systems, bioenergy and hydrogen economy, grid integration of renewable energy systems, distributed generation, economic analysis, and environmental impacts of renewable energy systems. The overall approaches are interdisciplinary and comprehensive, covering economic, environmental, and grid integration issues as well as the physical and engineering aspects. Core issues discussed include mechanical, electrical, and thermal energy storage systems, batteries, fuel cells, biomass and biofuels, hydrogen economy, distributed generation, a brief presentation of microgrids, and in-depth discussions of economic analysis and methods of renewable energy systems, environmental impacts, life-cycle analysis, and energy conservation issues. With several solved examples, holistic material presentation, in-depth subject matter discussions and self-content material presentation, this textbook will appeal strongly to students and professional and nonprofessional readers who wish to understand this fascinating subject. Readers are encouraged to solve the problems and questions, which are useful ways to understand and apply the concepts and the topics included.

Advances in Biofeedstocks and Biofuels, Production Technologies for Biofuels

Download Advances in Biofeedstocks and Biofuels, Production Technologies for Biofuels PDF Online Free

Author : Lalit Kumar Singh
Publisher : John Wiley & Sons
ISBN 13 : 1119117542
Total Pages : 259 pages
Book Rating : 4.1/5 (191 download)

Book Synopsis Advances in Biofeedstocks and Biofuels, Production Technologies for Biofuels by : Lalit Kumar Singh

Download or read book Advances in Biofeedstocks and Biofuels, Production Technologies for Biofuels written by Lalit Kumar Singh and published by John Wiley & Sons. This book was released on 2017-05-25 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second volume in the Advances in Biofeedstocks and Biofuels series focuses on the latest and most up-to-date technologies and processes involved in the production of biofuels. Biofuels production is one of the most extensively studied fields in the energy sector that can provide an alternative energy source and bring the energy industry closer to sustainability. Biomass-based fuel production, or renewable fuels, are becoming increasingly important as a potential solution for man-made climate change, depleted oil reserves, and the dangers involved with hydraulic fracturing (or "fracking"). The price of oil will always be volatile and changeable, and, as long as industry and private citizens around the world need energy, there will be a need for alternative energy sources. The area known as "biofuels and biofeedstocks" is one of the most important and quickly growing pieces of the "energy pie." Biofuels and biofeedstocks are constantly changing, and new processes are constantly being created, changed, and improved upon. The area is rapidly changing and always innovative. It is important, therefore, that books like the volumes in this series are published and the information widely disseminated to keep the industry informed of the state-of-the-art. This second volume in the Advances in Biofeedstocks and Biofuels series focuses on the production of biofuel, covering all of the major biofuels, such as biodiesel, biohydrogen, bioethanol, and others. This engaging text touches on all of the most important new processes and technologies, providing the most up-to-date coverage of the science available to industry. It is a must-have for any engineer or scientist working with biofuel technology.

Encyclopedia of Environmental Management, Four Volume Set

Download Encyclopedia of Environmental Management, Four Volume Set PDF Online Free

Author : Sven Erik Jorgensen
Publisher : CRC Press
ISBN 13 : 1000031721
Total Pages : 3513 pages
Book Rating : 4.0/5 ( download)

Book Synopsis Encyclopedia of Environmental Management, Four Volume Set by : Sven Erik Jorgensen

Download or read book Encyclopedia of Environmental Management, Four Volume Set written by Sven Erik Jorgensen and published by CRC Press. This book was released on 2012-12-13 with total page 3513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Winner of an Outstanding Academic Title Award from CHOICE Magazine Encyclopedia of Environmental Management gives a comprehensive overview of environmental problems, their sources, their assessment, and their solutions. Through in-depth entries and a topical table of contents, readers will quickly find answers to questions about specific pollution and management issues. Edited by the esteemed Sven Erik Jørgensen and an advisory board of renowned specialists, this four-volume set shares insights from more than 500 contributors—all experts in their fields. The encyclopedia provides basic knowledge for an integrated and ecologically sound management system. Nearly 400 alphabetical entries cover everything from air, soil, and water pollution to agriculture, energy, global pollution, toxic substances, and general pollution problems. Using a topical table of contents, readers can also search for entries according to the type of problem and the methodology. This allows readers to see the overall picture at a glance and find answers to the core questions: What is the pollution problem, and what are its sources? What is the "big picture," or what background knowledge do we need? How can we diagnose the problem, both qualitatively and quantitatively, using monitoring and ecological models, indicators, and services? How can we solve the problem with environmental technology, ecotechnology, cleaner technology, and environmental legislation? How do we address the problem as part of an integrated management strategy? This accessible encyclopedia examines the entire spectrum of tools available for environmental management. An indispensable resource, it guides environmental managers to find the best possible solutions to the myriad pollution problems they face. Also Available Online This Taylor & Francis encyclopedia is also available through online subscription, offering a variety of extra benefits for researchers, students, and librarians, including: Citation tracking and alerts Active reference linking Saved searches and marked lists HTML and PDF format options Contact us to inquire about subscription options and print/online combination packages. US: (Tel) 1.888.318.2367 / (email) [email protected] International: (Tel) +44 (0) 20 7017 6062 / (email) [email protected]

Renewable Resources for Surface Coatings, Inks and Adhesives

Download Renewable Resources for Surface Coatings, Inks and Adhesives PDF Online Free

Author : Rainer Höfer
Publisher : Royal Society of Chemistry
ISBN 13 : 1788013026
Total Pages : 884 pages
Book Rating : 4.7/5 (88 download)

Book Synopsis Renewable Resources for Surface Coatings, Inks and Adhesives by : Rainer Höfer

Download or read book Renewable Resources for Surface Coatings, Inks and Adhesives written by Rainer Höfer and published by Royal Society of Chemistry. This book was released on 2022-11-11 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a detailed survey of renewable raw materials for paints, inks and glues, this book is ideal for researchers and practitioners working in the areas of green chemistry, industrial chemistry and sustainability. Beginning with a brief history of coatings and adhesives, this book walks the reader through the chemistry, properties, sourcing and processing of a number of renewable raw materials, including lipids, natural resins, proteins, and carbohydrates. Their use in a range of recent developments and concepts from material protection, to decorative paints and coatings, adhesives and sealants is highlighted, providing the reader with a complete and modern foundation to the field.

RENEWABLE ENERGY SYSTEMS AND DESALINATION - Volume I

Download RENEWABLE ENERGY SYSTEMS AND DESALINATION - Volume I PDF Online Free

Author :
Publisher : EOLSS Publications
ISBN 13 : 1848264291
Total Pages : 428 pages
Book Rating : 4.8/5 (482 download)

Book Synopsis RENEWABLE ENERGY SYSTEMS AND DESALINATION - Volume I by :

Download or read book RENEWABLE ENERGY SYSTEMS AND DESALINATION - Volume I written by and published by EOLSS Publications. This book was released on 2010-09-19 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Renewable Energy Systems and Desalination is a component of Encyclopedia of Water Sciences, Engineering and Technology Resources in the global Encyclopedia of Life Support Systems (EOLSS), which is an integrated compendium of twenty one Encyclopedias. The two volumes present state-of-the art subject matter of various aspects of Renewable Energy Systems and Desalination such as: A Short Historical Review Of Renewable Energy; Renewable Energy Resources; Desalination With Renewable Energy - A Review; Renewable Energy And Desalination Systems; Why Use Renewable Energy For Desalination; Thermal Energy Storage; Electrical Energy Storage; Tidal Energy; Desalination Using Tidal Energy; Wave Energy; Availability Of Wind Energy And Its Estimation; The Use Of Geothermal Energy In Desalination; Solar Radiation Energy (Fundamentals); High Temperature Solar Concentrators; Medium Temperature Solar Concentrators (Parabolic-Troughs Collectors); Low Temperature Solar Collectors; Solar Photovoltaic Energy Conversion; Photovoltaics; Flat-Plate Collectors; Large Active Solar Systems: Load; Integration Of Solar Pond With Water Desalination; Large Active Solar Systems: Typical Economic Analysis; Evacuated Tube Collectors; Parabolic Trough Collectors; Central Receivers; Configuration, Theoretical Analysis And Performance Of Simple Solar Stills; Development In Simple Solar Stills; Multi-Effect Solar Stills; Materials For Construction Of Solar Stills; Reverse Osmosis By Solar Energy; Solar Distillation; Solar Photochemistry; Photochemical Conversion Of Solar Energy; Availability Of Solar Radiation And Its Estimation; Economics Of Small Solar-Assisted Multipleeffect Seawater Distillation Plants; A Solar-Assisted Sea Water Multiple Effect Distillation Plant 15 Years Of Operating Performance (1985-1999);Mathematical Simulation Of A Solar Desalination Plant; Mathematical Models Of Solar Energy Conversion Systems; Multiple Effect Distillation Of Seawater Using Solar Energy – The Case Of Abu Dhabi Solar Desalination Plant; Solar Irradiation Fundamentals; Water Desalination By Humidification And Dehumidification Of Air, Seawater Greenhouse Process. These volumes are aimed at the following five major target audiences: University and College Students Educators, Professional Practitioners, Research Personnel and Policy and Decision Makers

Efficient Use and Conservation of Energy - Volume II

Download Efficient Use and Conservation of Energy - Volume II PDF Online Free

Author : Clark W. Gellings
Publisher : EOLSS Publications
ISBN 13 : 1905839324
Total Pages : 304 pages
Book Rating : 4.9/5 (58 download)

Book Synopsis Efficient Use and Conservation of Energy - Volume II by : Clark W. Gellings

Download or read book Efficient Use and Conservation of Energy - Volume II written by Clark W. Gellings and published by EOLSS Publications. This book was released on 2009-06-10 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Efficient Use and Conservation of Energy is a component of Encyclopedia of Energy Sciences, Engineering and Technology Resources in the global Encyclopedia of Life Support Systems (EOLSS), which is an integrated compendium of twenty Encyclopedias. The Theme on Efficient Use and Conservation Of Energy discusses matters of great relevance to our world such as: Efficient Use and Conservation of Energy in the Industrial Sector; Efficient Use and Conservation of Energy in Buildings; Efficient Use and Conservation of Energy in the Transportation Sector; Efficient Use and Conservation of Energy in the Agricultural Sector; Using Demand-Side Management to Select Energy Efficient Technologies and Programs . These two volumes are aimed at the following five major target audiences: University and College students Educators, Professional practitioners, Research personnel and Policy analysts, managers, and decision makers and NGOs.

Green Petroleum

Download Green Petroleum PDF Online Free

Author : M. R. Islam
Publisher : John Wiley & Sons
ISBN 13 : 1118444078
Total Pages : 427 pages
Book Rating : 4.1/5 (184 download)

Book Synopsis Green Petroleum by : M. R. Islam

Download or read book Green Petroleum written by M. R. Islam and published by John Wiley & Sons. This book was released on 2012-09-25 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Can "green petroleum" reverse global warming and bring down high gasoline prices? Written in non-technical language for the layperson, this book investigates and details how the oil and gas industry can "go green" with new processes and technologies, thus bringing the world's most important industry closer to environmental and economic sustainability. This book unravels the mysteries of the current energy crisis and argues that solutions to global warming will come only from the development of new technologies. Discussed here are the reasons why petroleum operations, as they are now, are not sustainable; how each practice treads an inherently implosive path; and how each spells irreversible damage to the planet's ecosystem. Fossil fuel consumption is not the culprit; rather, the practices involved, from exploration to refining and processing, are responsible for the current damage to the environment.

The American Economy [2 volumes]

Download The American Economy [2 volumes] PDF Online Free

Author : Cynthia Clark
Publisher : Bloomsbury Publishing USA
ISBN 13 : 1598844628
Total Pages : 1394 pages
Book Rating : 4.5/5 (988 download)

Book Synopsis The American Economy [2 volumes] by : Cynthia Clark

Download or read book The American Economy [2 volumes] written by Cynthia Clark and published by Bloomsbury Publishing USA. This book was released on 2011-03-11 with total page 1394 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compelling compilation of short entries, longer topical essays, and primary source documents that chronicles the historical development of the United States from an economic perspective. Based on a work originally published in 2003, The American Economy: A Historical Encyclopedia has been thoroughly updated with information on the accounting scandals of the early 2000s and the recession of 2008, including the government stimulus and bailout programs and the recession's impact on key markets. With more than 600 short entries, 31 longer essays, and 32 primary source documents, the encyclopedia spans American history from colonial times to the present. Researchers will discover detailed information on people, events, and government actions that have shaped our economy, with entries on such seminal issues as slavery, migration patterns, the welfare state, the rise of the city, and the development of financial institutions. Throughout, special attention is paid to the interdependence of economics with political, social, and cultural forces. Covering everything from the national debt to monetary policy, law, unemployment, inflation, and government/business relations, this work is the ideal go-to resource for quick answers, in-depth analysis, or direction for further research.

The World Book Encyclopedia

Download The World Book Encyclopedia PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 554 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis The World Book Encyclopedia by :

Download or read book The World Book Encyclopedia written by and published by . This book was released on 2002 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: An encyclopedia designed especially to meet the needs of elementary, junior high, and senior high school students.