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Frequency Response Testing in Nuclear Reactors presents the optimum testing procedures for measurements in power reactors. This eight-chapter book emphasizes the determination of the system frequency response using nonsinusoidal input perturbations, which are useful since normal power reactor hardware can be used.
This text deals first with the mathematical aspects of frequency response testing, with a particular emphasis on numerical Fourier transformations using analog or digital equipment. The subsequent chapters examine the important signals for use in frequency responses tests and the analysis of these signals using analog and digital computing equipment. The discussion then shifts to the frequency response functions that describe nuclear reactor dynamics. This topic is followed by a presentation of techniques for extracting useful information from test results. A chapter highlights the most common control-rod drive mechanisms to assess their suitability for dynamics testing. The concluding chapter provides a brief summary of significant experiences with dynamics tests in nuclear reactors.
Scientists, researchers, and workers in the field of nuclear reactors and related subjects will find this book invaluable.

Freshwater algae are among the most diverse and ubiquitous organisms on earth. They occupy an enormous range of ecological conditions from lakes and rivers to acidic peat swamps, inland saline lakes, snow and ice, damp soils, wetlands, desert soils, wastewater treatment plants, and are symbionts in and on many plants, fungi, and animals. In North America, the variety of freshwater habitats colonized by algae is very rich, and offers an enormous and fascinating range of environments for their study. They form the base of most aquatic food webs and are critical to studies of ecosystem health. Algal ecologists and taxonomists play an important role in the understanding of aquatic ecosystems: their biodiversity, productivity, interactions with other organisms, and water quality. This book provides in one volume a practical and comprehensive guide to the genera of freshwater algae known from North America. The format combines the necessary ecological, taxonomic and methodological information for all scientists working in aquatic environments, whether their specialty is in environmental monitoring and water quality assessment, biological composition, ecology, evolution, or molecular biology.

Key Features
* The first complete accounting of North America's freshwater algal genera in more than 50 years
* Includes a guide to the current literature on species identification in each group of algae
* High-quality photographs and drawings of more than 770 genera
* A clear, easy-to-use introductory key to the diagnostic chapters
* Synthetic chapters on freshwater habitats, use of algae in environmental assessment, and control of nuisance algae
* Contributions from 27 experts in all areas of freshwater algae
* Extensive literature citations
* Companion volume of Ecology and Classification of North American Freshwater Invertebrates 2nd edition, edited by Throp and Covich

Freshwater Algae of North America: Ecology and Classification, Second Edition is an authoritative and practical treatise on the classification, biodiversity, and ecology of all known genera of freshwater algae from North America. The book provides essential taxonomic and ecological information about one of the most diverse and ubiquitous groups of organisms on earth. This single volume brings together experts on all the groups of algae that occur in fresh waters (also soils, snow, and extreme inland environments). In the decade since the first edition, there has been an explosion of new information on the classification, ecology, and biogeography of many groups of algae, with the use of molecular techniques and renewed interest in biological diversity. Accordingly, this new edition covers updated classification information of most algal groups and the reassignment of many genera and species, as well as new research on harmful algal blooms.

• Extensive and complete
• Describes every genus of freshwater algae known from North America, with an analytical dichotomous key, descriptions of diagnostic features, and at least one image of every genus.
• Full-color images throughout provide superb visual examples of freshwater algae
• Updated Environmental Issues and Classifications, including new information on harmful algal blooms (HAB)
• Fully revised introductory chapters, including new topics on biodiversity, and taste and odor problems
• Updated to reflect the rapid advances in algal classification and taxonomy due to the widespread use of DNA technologies

This book is a general text covering both basic and applied aspects of freshwater ecology and serves as an introduction to the study of lakes and streams. Issues of spatial and temporal scale, anthropogenic impacts, and application of current ecological concepts are covered along with ideas that are presented in more traditional limnological texts. Chapters on biodiversity, toxic chemicals, extreme and unusual habitats, and fisheries increase the breadth of material covered. The book includes an extensive glossary, questions for thought, worked examples of equations, and real-life problems.


Key Features
* Broad coverage of groundwaters, streams, wetlands, and lakes
* Features basic scientific concepts and environmental applications throughout
* Includes many figures, sidebars of fascinating applications, and biographies of practicing aquatic ecologists
* Materials are presented to facilitate learning, including an extensive glossary, questions for thought, worked examples of equations, and real life problems
* Written at a level understandable to most undergraduate students, with explanations of complex contemporary concepts in freshwater ecology described to promote understanding
* Featuring small chapters that mainly stand alone, this book can be read in the order most suited to the specific application

This book clearly identifies nearly 170 families of fishes through the use of high-quality illustrations and includes an accurate account of selected members of that particular fish family, as well as a distribution map and accompanying commentary on classification, distribution, and diversity.

Key Features
* High-quality illustrations of representatives from each family
* Distribution map provided for each family
* Commentary for each family

The use of friction stir processing to locally modify the microstructure to enhanced formability has the potential to alter the manufacturing of structural shapes. There is enough research to put together a short monograph detailing the fundamentals and key findings. One example of conventional manufacturing technique for aluminum alloys involves fusion welding of 5XXX series alloys. This can be replaced by friction stir welding, friction stir processing and forming. A major advantage of this switch is the enhanced properties. However qualification of any new process involves a series of tests to prove that material properties of interest in the friction stir welded or processed regions meet or exceed those of the fusion welded region (conventional approach). This book will provide a case study of Al5083 alloy with some additional examples of high strength aluminum alloys.

• Demonstrates how friction stir processing enabled forming can expand the design space by using thick sheet/plate for applications where pieces are joined because of lack of formability
• Opens up new method for manufacturing of structural shapes
• Shows how the process has the potential to lower the cost of a finished structure and enhance the design allowables

This book describes the fundamentals and potential applications of ‘friction stir superplasticity for unitized structures’. Conventional superplastic forming of sheets is limited to the thickness of 3 mm because the fine grained starting material is produced by rolling. Friction stir superplasticity has grown rapidly in the last decade because of the effectiveness of microstructural refinement. The thickness of the material remains almost constant, and that allows for forming of thick sheets/plates, which was not possible before. The field has reached a point where designers have opportunities to expand the extent of unitized structures, which are structures in which the traditional primary part and any supporting structures are fabricated as a single unit. With advanced optimization and material considerations, this class of structures can be lighter weight and more efficient, making them less costly, as well as mechanically less complex, reducing areas of possible failure.

• Discusses how friction stir processing allows selective microstructural refinement without thickness change
• Demonstrates how higher thickness sheets and plates can be superplastically formed
• Examples are presented for aluminum, magnesium and titanium alloys
• Covers the production of low-cost unitized structures by selectively processing cast sheets/plates

This book will summarize research work carried out so far on dissimilar metallic material welding using friction stir welding (FSW). Joining of dissimilar alloys and materials are needed in many engineering systems and is considered quite challenging. Research in this area has shown significant benefit in terms of ease of processing, material mixing, and superior mechanical properties such as joint efficiencies. A summary of these results will be discussed along with potential guidelines for designers.

• Explains solid phase process and distortion of work piece
• Addresses dimensional stability and repeatability
• Addresses joint strength
• Covers metallurgical properties in the joint area
• Covers fine microstructure
• Introduces improved materials use (e.g., joining different thicknesses)
• Covers decreased fuel consumption in light weight aircraft
• Addresses automotive and ship applications

Friction Stir Welding of High Strength 7XXX Aluminum Alloys is the latest edition in the Friction Stir series and summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field.

Friction stir welding has demonstrated significant benefits in terms of its potential to reduce cost and increase manufacturing efficiency of industrial products in transportation, particularly the aerospace sector. The 7XXX series aluminum alloys are the premium aluminum alloys used in aerospace. These alloys are typically not weldable by fusion techniques and considerable effort has been expended to develop friction stir welding parameters. Research in this area has shown significant benefit in terms of joint efficiency and fatigue performance as a result of friction stir welding. The book summarizes those results and includes discussion of the potential future directions for further optimization.

• Offers comprehensive coverage of friction stir welding of 7XXX series alloys
• Discusses the physical metallurgy of the alloys
• Includes physical metallurgy based guidelines for obtaining high joint efficiency
• Summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field