The rare earths

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  • Volume 41 of the Handbook on the Physics and Chemistry of Rare Earths adds four chapters to the series: two focus on nanoscale rare-earth mate- rials, while the other two are concerned with divergent topics—the arrangement of the rare-earth elements in the periodic table, and the higher order rare-earth chalogenide compounds with the elements of the 14th group and also In. The first chapter (248) discusses the various proposals suggested for the location of the rare-earth elements in the periodic table from the time of Mendeleev to the present day.

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  • The first chapter (236) in this volume of the Handbook on the Physics and Chem- istry of Rare Earth is a recapitulation of the scientific achievements and contri- butions made by the late Professor LeRoy Eyring (1919–2005) to the science of the lanthanide oxides in which the lanthanide element has a valence equal to or greater than three. Although LeRoy had a broad range of interests in the chemistry of the rare earths and actinides the main focus of his outstanding scientific career was concerned with the lanthanide higher oxides. This chapter was written by Dr.

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  • The complexes Ln(Leu)3ImCl3.3H2O (Ln: Eu, Yb; Leu: L-leucine; Im: imidazole) have been synthesized and characterized by the elemental analysis method , IR spectra and thermal analysis. IR spectra indicated that the rare earth ions are coodinated by both the oxygen atom from the COOgroup and the nitrogen atom from the NH2 group from L-leucine and coodinated with the 3-nitrogen atom for imidazole. The complexes thermal dissociation.

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  • A visual odyssey that will change the way we see our planet, this remarkable book, companion to the acclaimed Discovery Channel/ BBC series, is an enduring and awe-inspiring record of one of the most ambitious natural history projects ever undertaken. Using the latest aerial surveillance, state-of-the-art cameras, and high definition technology, the creators of Planet Earth have assembled more than 400 stunning photographs of wondrous natural landscapes from around the globe, including incredible footage of the rarely spotted, almost mythical creatures that live in these habitats....

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  • ITuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: nfluence of Rare Earth Doping on the Structural and Catalytic Properties of Nanostructured Tin Oxide

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  • 5 Calcium The rare earth element calcium is one of the most abundant elements in the lithosphere; it is readily available in most soils; and it is a macronutrient for plants, yet it is actively excluded from plant cytoplasm.

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  • Optical fibers, an important and promising material, have been the subject of intensive research and development due to their many scientific and practical applications. They are designed to guide light along its length by confining as much light as possible in its core. The interaction between the propagating light with the fiber material is the foundation of the development of various applications such as optical amplifiers, fiber lasers, sensors etc.

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  • In this study, crystal structure and magnetic properties for Bi1-xEuxFeO3 compounds are presented. When the Eu content was below 5% (x < 0.05), no significant improvement in magnetic properties was observed. However, when x < 0.20, ferromagnetism was induced. More particularly, at x = 0.20, the compounds experienced a drastically structural transition that governs also their optical properties.

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  • Most of the material in this volume is new. The first three chapters deal with three important fiber-optic components--fiber-based gratings, couplers, and interferometers--that serve as the building blocks of lightwave technology. In view of the enormous impact of rare-earth-doped fibers, amplifiers and lasers made by using such fibers are covered in Chapters 4 and 5. The last three chapters describe important applications of nonlinear fiber optics and are devoted to pulse-compression techniques, fiber-optic communication systems, and soliton-based transmission schemes....

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  • Magnesium alloys have always been attractive to designers due to their low density, only two thirds that of aluminium. This has been a major factor in the widespread use of magnesium alloy castings and wrought products. The present book gives us an overview in some special areas of magnesium alloys concerning technological applications and eco-friendly requirements. Each chapter brings us a new facet relating to the application of magnesium alloy including, as an example, researches with rare earth metals as alloying components in magnesium implants for orthopaedic applications....

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  • Assadi et al. Nanoscale Research Letters 2011, 6:357 NANO REVIEW Open Access Structural and electronic properties of Eu- and Pd-doped ZnO Mohammad Hussein Naseef Assadi1,2, Yuebin Zhang2, Rong-Kun Zheng1, Simon Peter Ringer1 and Sean Li2* Abstract Doping ZnO with rare earth and 4d transition elements is a popular technique to manipulate the optical properties of ZnO systems. These systems may also possess intrinsic ferromagnetism due to their magnetic moment borne on 4f and 4d electrons.

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  • This book deals with theoretical and experimental aspects of solid-state lasers, including optimum waveguide design of end pumped and diode pumped lasers. Nonlinearity, including the nonlinear conversion, up frequency conversion and chirped pulse oscillators are discussed. Some new rare-earth-doped lasers, including double borate and halide crystals, and feedback in quantum dot semiconductor nanostructures are included.

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  • Ecotourism is said to be a high prospective trend in tourism development. Theoretically, it addresses the triple bottom line of the World’s pressing issues. Nevertheless, the reality does not usually come up to expectations. Very few case studies were proved to be successfully adopted. One of the reasons is the weakness in terms of community approach, particularly in developing countries.

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  • The article exposes the statistic mathematical model of the disingtegrating the Nam Namxe rare earth ore by sulphuric acid. The suitable regime of the technological process is determined by using this model.

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  • A review of the investigations on the sea 1eve1 changes in South-china sea is presented. The full set of year1y sea 1eve1 data at 25 tide gauges a1ong Vietnam coast is used for extreme analysis and trend analysis. Based on the level data collection up to year 2007 the empirical extreme analysis yields new estimates of the design values of sea level with different rare frequencies. The results of extreme analysis are compared with the theoretical extreme heights of tide obtained by predicting hourly tide heights in a 20-year period. ...

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  • The complexes of some rare earths with DL-2-amino-n-butyric acid were synthesized. The solid complexes have the general formula [Ln(Hbu)4]Cl3 [Ln: Pr, Nd, Sm, Eu, Gd and Hbu: CH3CH2CHNH2COOH]. The structure of the complexes have been recognised by the basic of elemental analysis, conductivity measurements, IR spectra and thermal analysis methods. It was found that the DL-2-amino-n-buryic acid utilized amino nitrogen and carboxyl oxygen for bonding.

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  • The study on solvent extraction of rare earth elements such as Nd, Y from nitric acid solutions with triphenylphosphin oxide (TPPO) has been studies. The influence of various factors such as concentrations of triphenylphosphin oxide, nitric acid and rare earth elements on the distribution coefficient has been studied.

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  • Philip Gordon Wylie (May 12, 1902 – October 25, 1971) was a U.S. author. Born in Beverly, Massachusetts, he was the son of Presbyterian minister Edmund Melville Wylie and the former Edna Edwards, a novelist, who died when he was five years old. His family moved to Montclair, New Jersey and he later attended Princeton University during 1920–1923. Some of his papers, writings, and other possessions are in the Department of Rare Books and Special Collections at Princeton University Library.

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  • Introduction Lead is a rare element present in the earth’s crust in a 1.4 Â 10À3% (w/w). It is a toxic heavy metal that exists only in a cubic close-packed metallic form. It shows the preference for the divalent state with electronic configuration [Xe]4f145d106s2 and low stability of the Pb–Pb covalent bond. Lead(IV) in solution is unstable (electronic configuration: [Xe]4f145d10). The most important Pb ore is galena (PbS). Other lead ores are anglesite (PbSO4), cerussite (PbCO3), mimetesite (Pb5(AsO4)3Cl), and pyromorphite (Pb5(PO4)3Cl). ...

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  • The present volume documents a fireside discussion with the world renowned oceanographer, Walter Munk, and gives the reader, whether scientist or surfer, a rare insight into a lifetime of passion for oceanography and geophysics. The book highlights the pioneering contributions Walter has made to wave prediction, ocean circulation, tides and their role in the Earth’s dynamics, internal waves, and ocean acoustic thermometry. It celebrates his zest for life and family, as well as his lasting curiosity. Munk’s career, spanning 70 years of innovation, has inspired generations...

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