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  • 1
    Call number: 11/M 01.0114
    In: Reviews in mineralogy & geochemistry
    Description / Table of Contents: The review chapters in this volume were the basis for a short course on sulfate minerals sponsored by the Mineralogical Society of America (MSA) November 11-12, 2000 in Tahoe City, California, prior to the Annual Meeting of MSA, the Geological Society of America, and other associated societies in nearby Reno, Nevada. The conveners of the course (and editors of this volume of Reviews in Mineralogy and Geochemistry), Alpers, John Jambor, and Kirk Nordstrom, also organized related topical sessions at the GSA meeting on sulfate minerals in both hydrothermal and low-temperature environments. Sulfate is an abundant and ubiquitous component of Earth's lithosphere and hydrosphere. Sulfate minerals represent an important component of our mineral economy, the pollution problems in our air and water, the technology for alleviating pollution, and the natural processes that affect the land we utilize. Vast quantities of gypsum are consumed in the manufacture of wallboard, and calcium sulfates are also used in sculpture in the forms of alabaster (gypsum) and papier-mache (bassanite). For centuries, AI-sulfate minerals, or "alums," have been used in the tanning and dyeing industries, and these sulfate minerals have also been a minor source of aluminum metal. Barite is used extensively in the petroleum industry as a weighting agent during drilling, and celestine (also known as "celestite") is a primary source of strontium for the ceramics, metallurgical, glass, and television face-plate industries. Jarosite is a major waste product of the hydrometallurgical processing of zinc ores and is used in agriculture to reduce alkalinity in soils. At many mining sites, the extraction and processing of coal or metal-sulfide ores (largely for gold, silver, copper, lead, and zinc) produce waste materials that generate acid-sulfate waters rich in heavy metals, commonly leading to contamination of water and sediment. Concentrated waters associated with mine wastes may precipitate a variety of metal-sulfate minerals upon evaporation, oxidation, or neutralization. Some of these sulfate minerals are soluble and store metals and acidity only temporarily, whereas others are insoluble and improve water quality by removing metals from the water column. There is considerable scientific interest in the mineralogy and geochemistry of sulfate minerals in both high-temperature (igneous and hydrothermal) and low-temperature (weathering and evaporite) environments. The physical scale of processes affected by aqueous sulfate and associated minerals spans from submicroscopic reactions at mineral-water interfaces to global issues of oceanic cycling and mass balance, and even to extraterrestrial applications in the exploration of other planets and their satellites. In mineral exploration, minerals of the alunite-jarosite supergroup are recognized as key components of the advanced argillic (acid-sulfate) hydrothermal alteration assemblage, and supergene sulfate minerals can be useful guides to primary sulfide deposits. The role of soluble sulfate minerals formed from acid mine drainage (and its natural equivalent, acid rock drainage) in the storage and release of potentially toxic metals associated with wet-dry climatic cycles (on annual or other time scales) is increasingly appreciated in environmental studies of mineral deposits and of waste materials from mining and mineral processing. This volume compiles and synthesizes current information on sulfate minerals from a variety of perspectives, including crystallography, geochemical properties, geological environments of formation, thermodynamic stability relations, kinetics of formation and dissolution, and environmental aspects. The first two chapters cover crystallography (Chapter 1) and spectroscopy (Chapter 2). Environments with alkali and alkaline earth sulfates are described in the next three chapters, on evaporites (Chapter 3), barite-celestine deposits (Chapter 4), and the kinetics of precipitation and dissolution of gypsum, barite, and celestine (Chapter 5). Acidic environments are the theme for the next four chapters, which cover soluble metal salts from sulfide oxidation (Chapter 6), iron and aluminum hydroxysulfates (Chapter 7), jarosites in hydrometallugy (Chapter 8), and alunite-jarosite crystallography, thermodynamics, and geochronology (Chapter 9). The next two chapters discuss thermodynamic modeling of sulfate systems from the perspectives of predicting sulfate-mineral solubilities in waters covering a wide range in composition and concentration (Chapter 10) and predicting interactions between sulfate solid solutions and aqueous solutions (Chapter 11). The concluding chapter on stable-isotope systematics (Chapter 12) discusses the utility of sulfate minerals in understanding the geological and geochemical processes in both high- and low-temperature environments, and in unraveling the past evolution of natural systems through paleoclimate studies.
    Type of Medium: Monograph available for loan
    Pages: xiii, 608 S.
    ISBN: 0-939950-52-9 , 978-0-939950-52-2
    ISSN: 1529-6466
    Series Statement: Reviews in mineralogy & geochemistry 40
    Classification:
    Mineralogy
    Note: Chapter 1. The Crystal chemistry of Sulfate Minerals by Frank C. Hawthorne, Servey V. Krivovichev, and Peter C. Burns, p. 1 - 112 Chapter 2. X-ray and Vibrational Spectroscopy of Sulfate in Earth Materials by Satish C. B. Myneni, p. 113 - 172 Chapter 3. Sulfate Minerals in Evaporite Deposits by Ronald J. Spencer, p. 173 - 192 Chapter 4. Barite-Celestine Geochemistry and Environments of Formation by Jeffrey S. Hanor, p. 193 - 276 Chapter 5. Precipitation and Dissolution of Alkaline Earth Sulfates: Kinetics and Surface Energy by A. Hina and G. H. Nancollas, p. 277 - 302 Chapter 6. Metal-sulfate Salts from Sulfide Mineral Oxidation by John L. Jambor, D. Kirk Nordstrom, and Charles N. Alpers, p. 303 - 350 Chapter 7. Iron and Aluminum Hydroxysulfates from Acid Sulfate Waters by J. M. Bigham and D. Kirk Nordstrom, p. 351 - 404 Chapter 8. Jarosites and Their Application in Hydrometallurgy by John E. Dutrizac and John L. Jambor, p. 405 - 452 Chapter 9. Alunite-Jarosite Crystallography, Thermodynamics, and Geochemistry by R. E. Stoffregen, C. N.. Alpers, and John L. Jambor, p. 453 - 480 Chapter 10. Solid-Solution Solubilities and Thermodynamics: Sulfates, Carbonates and Halides by Pierre Glynn, p. 481 - 512 Chapter 11. Predicting Sulfate-Mineral Solubility in Concentrated Waters by Carol Ptacek and David Blowes, p. 513 - 540 Chapter 12. Stable Isotope Systematics of Sulfate Minerals by Robert R. Seal, II, Charles N. Alpers, and Robert O. Rye, p. 541 - 602
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4871-4873 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The liquid coating (LC) has been employed to apply epoxy and lubricant over the surface of rapidly solidified Nd–Fe–B powder particles. The LC led to an improvement of physical and magnetic properties for the powders and magnets compared to the dry blending and the encapsulation methods. The LC powders have excellent flowability and can be used for bonded magnets requiring very close tolerances; further bonded magnets made using this powder posses higher strength.© 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5995-6012 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A concerted theoretical and experimental effort has been carried out to characterize and assign in-plane and out-of-plane torsional vibrational modes of hydrogen fluoride trimer. These vibrations are large amplitude motions which sample sizable regions of the intermolecular potential energy surface. The cyclic (HF)3 cluster was modeled as a three-dimensional system of fully coupled hindered rotors. Vibrational energy levels, wave functions, and oscillator strengths moments were calculated for each of the two vibrational systems. Potential energy surfaces for the interaction of the coupled rotors were calculated via a multipole moment and multipole polarizability electrostatic analysis. Complete vibrational manifolds for the two systems are presented. An important feature is that two vibrational bands, an in-plane overtone E'(vA'=0,vE'=2) and an out-of-plane combination E'(vA‘=1,vE‘=1), were calculated to exist within the frequency range of the CO2 laser. Using a two-laser, double-resonance technique, two rovibrational transitions were observed, corresponding to these predicted bands. Theoretical determinations of oscillator strengths and the effects of deuterium isotopic substitution on the vibrational energy levels were experimentally verified to establish the assignment of the observed transitions to their specific vibrational modes. The theoretical analysis was continued to examine the anharmonicity, amplitude of vibrational motion, and oscillator strengths of the vibrational modes of the cluster in detail. The experimentally determined linewidths of the observed transitions were compared to the previously reported linewidth of the (HF)3 predissociative H–F stretching mode.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 2463-2471 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibrational predissociation spectra of N2–HF, acetylene–HF, ethylene–HF, and cyclopropane–HF in the HF stretching region have been measured using a molecular beam apparatus equipped with a mass spectrometer and a LiNbO3 optical parametric oscillator (OPO). The spectra are not dominated by homogeneous broadening. The HF stretching frequencies of N2–HF, C2H2–HF, C2H4–HF, and C3H6–HF are 3918.2(1), 3793.4(2), 3781(1), and 3761(1)cm−1, respectively. Individual rotational lines have been resolved for the N2–HF, C2H2–HF, and C2H4–HF complexes using the OPO in high resolution (0.06 cm−1 FWHM) mode. The lower limits to the predissociation lifetime obtained from the widths of these lines vary from 35 to 88 ps. An upper limit to these lifetimes of ∼2 μs was obtained from the observed depletion of the molecular beam.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6227-6228 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A technique for identifying and eliminating larger cluster contamination in vibrational predissociation spectra of van der Waals clusters using mass spectroscopic detection is presented. The application of this technique to the study of benzene dimer is discussed.
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 30 (1965), S. 2549-2552 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 30 (1999), S. 0 
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Business Process Reengineering (BPR) has been a major catalyst of the pervasive organizational change we have witnessed over the past decade. Although one can speculate on the reasons for the popularity of this phenomenon, it is important that we carefully examine its underlying antecedents for initiation, implementation, and ultimately success, if we are to add value to practitioners of this concept. This study empirically examines the importance of facets of the organizational structure, IT knowledge resources and infrastructure, and the IS function in the initiation of BPR. Data from 313 corporations were gathered using a carefully validated survey, and initiators were compared with noninitiators. The results strongly suggest that client-server architectures, the strategic integration of IS, and cross departmental interaction are among the more important factors facilitating initiation and can be important inputs in a BPR decision-making process. The study attempts to build a contingent theory for BPR, and the more sustainable notion of fundamental process change.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 70 (2005), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Kinetic parameters for thiamin degradation were obtained using 2 high-temperature heating methods: (1) atmospheric pressure (AP) with moisture correction and (2) controlled pressure (CP). At AP conditions, 33.3% dry basis (db) moisture wheat flour with 0.35% (db) thiamin was heated in thin steel cells isothermally at 145,160, and 172°C. To obtain the moisture correction factor, a constant-moisture study was conducted at 80°C using 6 moisture contents (6.1% to 36.9%). At CP conditions, flour at 19%, 28.2%, and 33.3% (db) moisture in double-seamed cans was heated in a CP steam retort at 129°C. For the AP method, the corrected activation energy for 33.3% moisture content was 129.5 kJ/g-mol and reaction rate at 80°C was 3.48×10−4 min−1. Using the CP method, the activation energy and reaction rate were 121.0 kJ/g-mol and 9.69×10−5 min−1, respectively. Results obtained from 2 methods were not statistically different. These results illustrated that the correction method could be used as an alternative for researchers without access to controlled pressure equipment and transient heat transfer software.
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 5165-5169 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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