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The Bogomils: A Study in Balkan Neo-Manichaeism traces the development of this little-understood heresy from its Middle Eastern roots. The Bogomils derived elements of their doctrine and practice from the Manichaeans and the Paulicians. By the reign of Alexius Comnenus, Bogomilism was rife within the Bulgarian and Byzantine empire and had taken hold even amongst influential families in Constantinople itself. Though they suffered persecution, decline and ultimate disappearance in their Balkan heartlands, the Bogomils were subsequently an influence upon more celebrated heresies in France and Italy. Dmitri Obolensky's magisterial study of Balkan dualism remains the definitive work on Bogomilism.

Fransmannen Adelbert von Chamisso flydde till Berlin undan franska revolutionen. Där skrev han 1814 denna djupt originella historia om Peter Schlemihl, mannen som sålde sin skugga till djävulen. I nykter berättarton förmedlas det fantasifulla händelseförloppet. Schlemihls vedermödor är många innan han till slut finner ro i vetenskapens tjänst. Den sagobetonade novellen bär spår av det känslomässiga dilemma som två ”fosterländer” innebar för den landsflyktige författaren. ”Chamissos bok är ett skolexempel på den litterära textens förmåga att i mötet med läsaren alstra en mångfald betydelser. I likhet med Melvilles vita val suger Peter Schlemihls skugga åt sig mening. Därför ger denna charmerande historia upphov till en strid ström av tolkningar, på samma sätt som guldmynten flödar ur Fortunati penningpung.” – Stefan Jonsson i Dagens Nyheter

This book focuses on current food shortages and on the impact of pests in reducing world food supplies. At present, total worldwide food losses from pests are estimated to be about 45 percent. Preharvest losses alone, from insects, plant pathogens, and weeds, are estimated at about 30 percent. Additional postharvest losses from microorganisms, insects, and rodents range from about 10 to 20 percent. The contributors present data on the extent of these kinds of crop losses and analyze immediate and long-term pest management strategies. Emphasis is given to an evaluation of the effectiveness of integrated controls and the various new nonchemical pest controls used to reduce crop and livestock losses. The current worldwide environmental problems associated with both large-scale pesticide use and other pest control methods are also analyzed, including the impact that increased use of pesticides can be expected to have on the human environment. While the data included are technical, the presentation and analysis will be of interest to both the scientific community and the general public.

This book focuses on current food shortages and on the impact of pests in reducing world food supplies. At present, total worldwide food losses from pests are estimated to be about 45 percent. Preharvest losses alone, from insects, plant pathogens, and weeds, are estimated at about 30 percent. Additional postharvest losses from microorganisms, insects, and rodents range from about 10 to 20 percent. The contributors present data on the extent of these kinds of crop losses and analyze immediate and long-term pest management strategies. Emphasis is given to an evaluation of the effectiveness of integrated controls and the various new nonchemical pest controls used to reduce crop and livestock losses. The current worldwide environmental problems associated with both large-scale pesticide use and other pest control methods are also analyzed, including the impact that increased use of pesticides can be expected to have on the human environment. While the data included are technical, the presentation and analysis will be of interest to both the scientific community and the general public.

New-Technology Flowmeters describes the origin, principle of operation, development, advantages and disadvantages, applications, and frontiers of research for new-technology flowmeters, which include Coriolis, magnetic, ultrasonic, vortex, and thermal. Focusing on the newer, faster growing flowmeter markets, the book places them in the context of more traditional meters such as differential pressure, turbine, and positive displacement. Taking an objective look at the origins of each flowmeter type, the book discusses the early patents, for each type, and which companies deserve credit for initially commercializing each flowmeter type. This book is designed for personnel involved with flowmeters and instrumentation, including product and marketing managers, strategic planners, application engineers, and distributors.

Written by a highly regarded power industry expert, this comprehensive manual covers in full detail all aspects of electric power distribution systems, both as they exist today and as they are evolving toward the future. A new chapter examines the impact of the emergence of cogeneration and distributed generation on the power distribution network. Topics include an overview of the process of electricity transmission and distribution, a thorough discussion of each component of the system - conductor supports, insulators and conductors, line equipment, substations, distribution circuits and more - as well as both overhead and underground construction considerations. Improvements in both materials and methods of power distribution are also explored, including the trend toward gradual replacement of heavier porcelain insulators with lighter polymer ones. The complex aspects of electric power distribution are explained in easy-to-understand, non-technical language.

New-Technology Flowmeters describes the origin, principle of operation, development, advantages and disadvantages, applications, and frontiers of research for new-technology flowmeters, which include Coriolis, magnetic, ultrasonic, vortex, and thermal. Focusing on the newer, faster growing flowmeter markets, the book places them in the context of more traditional meters such as differential pressure, turbine, and positive displacement. Taking an objective look at the origins of each flowmeter type, the book discusses the early patents, for each type, and which companies deserve credit for initially commercializing each flowmeter type. This book is designed for personnel involved with flowmeters and instrumentation, including product and marketing managers, strategic planners, application engineers, and distributors.

Latest Edition Explores Fresh, New Alternatives to Fossil FuelsThe Science of Renewable Energy, Second Edition takes a look at ways to produce sustainable and reliable energy sources and presents practical examples along with scientific methods, models, observations, and tools. Developed by esteemed author Frank R. Spellman, this book includes input from industry experts offering guidance and direction on obtaining self-replenishing energy from natural processes. The book focuses on the various forms of renewable energy derived from natural processes that are constantly replenished: solar energy, wind energy, ocean energy, wave energy, tidal energy, geothermal energy, biomass energy, hydropower energy, biofuels, and hydrogen fuel cells. New in the Second Edition: Updates each chapter with current information including the latest innovationsElaborates on energy basicsAdds important energy parameters dealing with both fossil fuel supplies and renewable resources (energy units as they apply to fossil fuel energy and renewable energy)Expands each chapter to include both the pros and cons of renewable energy production and useThe Science of Renewable Energy, Second Edition focuses on the production of clean and efficient energy sources and serves as a reference to undergraduates in renewable energy courses as well as non-specialists within the energy industries.

An overcurrent is caused by a short-circuit, ground-fault, or an overload.A short-circuit may be hundreds or even thousands of times above the normal operating current. This type of fault may be an arcing fault between ungrounded conductors or between an ungrounded conductor and a grounded (usually, a neutral) conductor, a line-to-line arcing fault may produce a current of 74% of a 3-phase bolted fault. A line-to-neutral arcing fault will be somewhat less.A line-to-line bolted fault, the equivalent, of the conductors bolted together, may be up to 100% of the available short-circuit current.A line-to-neutral bolted fault may be in excess of 100% of the 3-phase bolted fault at the source, but considerably less downstream.A ground-fault, that is, the equivalent of a connection between an ungrounded conductor and the equipment grounding system, will produce a current that may be 38% or higher of the 3-phase bolted fault current. These types of faults are typically arcing faults which normally are intermittent in nature. That is, they strike and restrike over time and may produce a short-circuit fault due to insulation damage.Once again, a line-to-equipment ground fault near the source may produce a fault current of over 100% of the 3-phase bolted fault, but considerably less downstream.An overload typically ranges from one to six times the normal current, and are normally caused by motor starting currents or transformer magnetizing currents. These conditions are of such short duration that the circuit components are not damaged.This book has a detailed analysis of these types of faults, along with explanations and examples of the various types of overcurrent protective devices to assure proper protection.This volume has extensive information on the application of overcurrent protection for conductors and equipment. The reader will be able to calculate fault currents as well as establishing the short-circuit withstand rating of conductor insulation and to determine the appropriate type of overcurrent devices based on circuit conditions.In addition, determining ground-fault currents for the purpose of selecting the proper size of equipment grounding conductors to establish an effective ground-fault current path is discussed in detail.Readership - Anyone involved with the design of overcurrent protection for electrical distribution systems from the system source to the electrical utilization equipment. The emphasis is placed on the design of the overcurrent protection for specific installations to assure proper protection for the circuit components regardless of the type of fault encountered.

Guide to Electrical Power Distribution Systems, Sixth Edition