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This book focuses on oil-paper insulation included in power transformers, especially for EHV and UHV transformers. The importance on insulation ever increased due to a growing voltage rating of transformers. Within the last decades, although research on the transformer insulation and diagnosis methods has advanced a lot, the insulation of HV transformers remained more or less unchanged. The book is divided into five chapters; the first and second chapters explain the basics of oil insulation, while the third chapter focuses on paper insulation. The final two chapters deal with the methods and outcome of testing both techniques. The primary target audience for this book is graduate students and power system engineers.
Electric insulators and insulation. --- Electric insulators and insulation --- Electric transformers. --- Oils. --- Transformers, Electric --- Electric currents --- Electric machinery --- Electric motors --- Insulating oils --- Oils, Insulating --- Transformer oil --- Mineral oils --- Oils and fats --- Bushings --- Insulation (Electric) --- Electric resistance --- Insulating materials --- Dielectrics --- Production of electric energy or. --- Power Electronics, Electrical Machines and Networks. --- Power electronics. --- Electronics, Power --- Electric power --- Electronics
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In the event of large swings in world food prices, countries often intervene to dampen the impact of international food price spikes on domestic prices and to lessen the burden of adjustment on vulnerable population groups. While individual countries can succeed at insulating their domestic markets from short-term fluctuations in global food prices, the collective intervention of many countries may exacerbate the volatility of world prices. Insulating policies introduced during the 2010-11 food price spike may have accounted for 40 percent of the increase in the world price of wheat and one-quarter of the increase in the world price of maize. Combined with government policy responses, the 2010-11 food price spike tipped 8.3 million people (nearly 1 percent of the world's poor) into poverty.
Agriculture --- Food Prices --- Food Security --- Inequality --- Insulating Policies --- International Economics and Trade --- International Trade and Trade Rules --- Macroeconomic Management --- Nutrition --- Poverty --- Poverty Reduction
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In the last decades, inedible lignocellulosic biomasses have attracted significant attention for being abundant resources that are not in competition with agricultural land or food production and, therefore, can be used as starting renewable material for the production of a wide variety of platform chemicals. The three main components of lignocellulosic biomasses are cellulose, hemicellulose and lignin, complex biopolymers that can be converted into a pool of platform molecules including sugars, polyols, alchols, ketons, ethers, acids and aromatics. Various technologies have been explored for their one-pot conversion into chemicals, fuels and materials. However, in order to develop new catalytic processes for the selective production of desired products, a complete understanding of the molecular aspects of the basic chemistry and reactivity of biomass derived molecules is still crucial. This Special Issue reports on recent progress and advances in the catalytic valorization of cellulose, hemicellulose and lignin model molecules promoted by novel heterogeneous systems for the production of energy, fuels and chemicals.
n/a --- hemicellulose --- catalytic transfer hydrogenolysis reactions --- furfural --- ZSM-5 --- syngas --- renewable aromatics --- Diels–Alder --- lignin --- hydroisomerization --- levulinic acid --- bio-oil upgrade --- metal ferrites --- aromatic ethers --- hierarchical zeolites --- Chilean natural zeolites --- bioethanol --- renewable p-xylene --- desilication --- dimethylfuran --- GC/MS characterization --- biomass --- H-donor molecules --- heterogeneous catalysis --- polyols --- Brønsted acids sites --- spinels --- solketal --- glycerol --- chemical-loop reforming --- zeolite --- cellulose --- insulating oils --- hydrogenolysis --- lignocellulosic biomasses --- bio-insulating oil --- glycidol --- Diels-Alder
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This review book focuses on the structure-property relationships of polyurethane nanocomposite foams in comparison with those of conventional polyurethane composite foams. The thermal insulation properties of polyurethane foam nanocomposites are discussed along with other traits such as their morphology, mechanical and thermomechanical properties, thermal degradation and flammability, energy absorption and saving capability, recycling and recovery behavior. In turn, the book discusses potential applications of PU nanocomposite foams and outlines the main problems that remain to be solved with regard to this important topic.
Polyurethanes. --- Nanocomposites (Materials) --- Insulating materials. --- Nanotechnology. --- Polymers. --- Materials science. --- Force and energy. --- Polymer Sciences. --- Energy Materials. --- Molecular technology --- Nanoscale technology --- High technology --- Conservation of energy --- Correlation of forces --- Energy --- Physics --- Dynamics --- Material science --- Physical sciences --- Polymere --- Polymeride --- Polymers and polymerization --- Macromolecules --- Polymers .
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This book proposes the air insulation prediction theory and method in the subject of electrical engineering. Prediction of discharge voltage in different cases are discussed and worked out by simulation. After decades, now bottlenecks of traditional air discharge theories can be solved with this book. Engineering applications of the theory in air gap discharge voltage prediction are introduced. This book serves as reference for graduate students, scientific research personnel and engineering staff in the related fields.
Electric insulators and insulation. --- Electric discharges. --- Discharges (Electricity) --- Electricity --- Electrostatic discharges --- Electrostatics --- Nuclear physics --- Electric action of points --- Photoelectricity --- Bushings --- Insulation (Electric) --- Electric resistance --- Insulating materials --- Dielectrics --- Discharges --- Production of electric energy or. --- Electronics. --- Power Electronics, Electrical Machines and Networks. --- Plasma Physics. --- Electronics and Microelectronics, Instrumentation. --- Security Science and Technology. --- Electrical engineering --- Physical sciences --- Power electronics. --- Plasma (Ionized gases). --- Microelectronics. --- System safety. --- Safety, System --- Safety of systems --- Systems safety --- Accidents --- Industrial safety --- Systems engineering --- Microminiature electronic equipment --- Microminiaturization (Electronics) --- Electronics --- Microtechnology --- Semiconductors --- Miniature electronic equipment --- Gaseous discharge --- Gaseous plasma --- Magnetoplasma --- Ionized gases --- Electronics, Power --- Electric power --- Prevention
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These proceedings of the EPS 2018: 5th International Conference on Geofoam Blocks in Construction Applications, held in Kyrenia, Northern Cyprus on May 9 to 11, 2018, present a collection of contributions on the state-of-the-art of research and applications relating to geofoam. Geofoam researchers, consultants, molders, contractors and practitioners from all around the globe discuss the recent developments and future trends of expanded polystyrene (EPS)-block geofoam technology and its construction applications. EPS’18 contributes to the development of geofoam applications, following on from successful conferences in Oslo (1985), Tokyo (1996), Salt Lake City (2001) and Oslo (2011). The book discusses topics including, but not limited to, current use of geofoam, design specifications, applications, new concepts, material properties, modeling and specific topics in geofoam blocks in construction applications.
Insulating materials --- Hydraulic engineering. --- Mechanics. --- Mechanics, Applied. --- Building construction. --- Geotechnical Engineering & Applied Earth Sciences. --- Geoengineering, Foundations, Hydraulics. --- Solid Mechanics. --- Building Materials. --- Ceramics, Glass, Composites, Natural Materials. --- Applied mechanics --- Engineering, Mechanical --- Engineering mathematics --- Classical mechanics --- Newtonian mechanics --- Physics --- Dynamics --- Quantum theory --- Engineering, Hydraulic --- Engineering --- Fluid mechanics --- Hydraulics --- Shore protection --- Geotechnical engineering. --- Engineering geology. --- Engineering—Geology. --- Foundations. --- Hydraulics. --- Building materials. --- Ceramics. --- Glass. --- Composites (Materials). --- Composite materials. --- Composites (Materials) --- Multiphase materials --- Reinforced solids --- Solids, Reinforced --- Two phase materials --- Materials --- Amorphous substances --- Ceramics --- Glazing --- Ceramic technology --- Industrial ceramics --- Keramics --- Building materials --- Chemistry, Technical --- Clay --- Architectural materials --- Architecture --- Building --- Building supplies --- Buildings --- Construction materials --- Structural materials --- Flow of water --- Water --- Hydraulic engineering --- Jets --- Structural engineering --- Underground construction --- Caissons --- Earthwork --- Masonry --- Soil consolidation --- Soil mechanics --- Walls --- Civil engineering --- Geology, Economic --- Engineering, Geotechnical --- Geotechnics --- Geotechnology --- Engineering geology --- Flow --- Distribution --- Details --- Geology
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