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  • 2000-2004  (56)
  • 1980-1984  (31)
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  • 1
    Type of Medium: Online Resource
    Pages: Online-Ressource ([125] p. = 2,86 MB)
    Edition: [Elektronische Ressource]
    Series Statement: International Odra Project Subproject 7
    Language: English
    Note: Contract BMBF 02WT9710 0. - Differences between the printed and electronic version of the document are possible. - nIndex p. 55 - 59 , Also available as printed version , Systemvoraussetzungen: Acrobat Reader.
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  • 2
    Keywords: Forschungsbericht ; Gussform ; Polystyrol ; Stärke ; Schaum
    Type of Medium: Online Resource
    Pages: Online-Ressource (58 S., 2,79 MB) , Ill., graph. Darst.
    Language: German
    Note: Förderkennzeichen BMVEL 96NR124-F - 22012496 , Unterschiede zwischen der gedruckten und der elektronischen Dokumentversion sind möglich , Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 3
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (56, 35, 21 p. = 3,16 MB) , ill., graphs
    Edition: [Elektronische Ressource]
    Language: German , English
    Note: Contract BMBF 50EE0061. - Differences between the printed and electronic version of the document are possible. - nIndex , Also available as printed version , Contains: SAND: Spectral ANalysis of Dryland degradation for global desertification assessment / Hermann Kaufmann. - Simulations of the technical requirements for a hyperspectral sensor for dryland degradation problems / A. Müller , Systemvoraussetzungen: Acrobat Reader.
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  • 4
    Online Resource
    Online Resource
    Amsterdam :Elsevier Science & Technology,
    Keywords: Sulfur. ; Electronic books.
    Description / Table of Contents: Sulfur: Its Significance for Chemistry, for the Geo-, Bio- and Cosmosphere and Technology focuses on the significance of sulfur for chemistry, geosphere, biosphere, cosmosphere, and technology. Topics covered range from the geochemistry and natural cycle of sulfur to the role of sulfur in "black powder". Organometallic sulfur compounds, thiolates, and the spectroscopic effects of sulfur chemistry are also discussed. Comprised of 21 chapters, this volume begins with an introduction to elemental sulfur and related homocyclic compounds and ions, focusing on their preparation, molecular and crystal structures, molecular spectra, and thermodynamic properties. Subsequent chapters deal with the origin and natural cycle of sulfur in the earth's crust; the role of sulfur in the reactions of exploding gunpowder; the use of sulfur in artwork; and developments in the field of organic sulfur chemistry. The catalytic properties of metal complexes of sulfur and sulfur-nitrogen compounds are also examined, along with the synthetic aspects of sulfido-complexes of molybdenum and tungsten. The final section is devoted to the role of sulfur in microbiology, biochemistry, and medicine. This monograph will be useful to students, practitioners, and researchers in the field of inorganic chemistry, as well as those who are interested in sulfur and its compounds.
    Type of Medium: Online Resource
    Pages: 1 online resource (526 pages)
    Edition: 1st ed.
    ISBN: 9781483289892
    Series Statement: Issn Series ; v.Volume 5
    DDC: 546/.723
    Language: English
    Note: Front Cover -- Sulfer: Its Significance for Chemistry, for the Geo-, Bio- and Cosmosphere and Technology -- Copyright Page -- Table of Contets -- Preface -- Contributors -- PART I: SULFUR: THE ELEMENT, ITS GEOCHEMISTRY AND SOME ASPECTS OF ITS HISTORY -- CHAPTER 1. ELEMENTAL SULFUR AND RELATED HOMOCYCLIC COMPOUNDS AND IONS -- 1 . Introduction -- 2. Elemental Sulfur (Neutral Rings Sn) -- 3. Homocyclic Sulfur Cations -- 4. Homocyclic Sulfur Oxides -- 5. Homocyclic Sulfur Halide Cations -- References -- CHAPTER 2. SULFUR IN THE EARTH'S CRUST, ITS ORIGIN AND NATURAL CYCLE -- 1. Cosmic and Terrestrial Abundance of Sulfur -- 2. Sulfur Cycle in the Continental Crust -- 3. Sulfur Cycle in the Oceanic Crust -- 4. Isotopic Composition of Natural Sulfur -- 5. Sulfur in the Water Cycle at the Earth's Surface -- References -- CHAPTER 3. SULFUR IN HISTORY: THE ROLE OF SULFUR IN "BLACK POWDER -- 1. Gunpowder - A Chinese Invention? -- 2. Technology of Black Powder in the European Middle Ages -- 3. The Composition of Black Powder and the Reaction of Its Components -- 4. The Role of Sulfur in Black Powder -- References -- CHAPTER 4. SULFUR IN ARTWORK: LAPIS LAZULI AND ULTRAMARINE PIGMENTS -- 1 . A Five-Thousand Years Old Pigment -- 2. The Synthesis of Ultramarine -- 3. Structure Analysis of Lapis Lazuli and of the Ultramarine Pigments -- 4. Blue Sulfur? -- 5. The Chromophores in Ultramarine-Yellow, -Green, -Violet and -Red -- 6. Chemical Behaviour of the Sulfur Species in Lapis Lazuli and in the Ultramarine Pigments -- 7. Concluding Remarks -- Acknowledgements -- References -- PART II: CHEMISTRY -- CHAPTER 5. NEW DEVELOPMENTS IN THE FIELD OF ORGANIC SULFUR CHEMISTRY -- 1 . Introduction -- 2. New Structures and New Methods for Understanding Structures -- 3. New Ideas on and New Applications of Reactions of Organosulfur Compounds. , 4. Sulfur-Containing Natural Products and Biologically Active Sulfur Compounds -- References -- CHAPTER 6. ORGANOMETALLIC SULFUR COMPOUNDS -- 1 . Introduction -- 2. Structural Types -- 3. Stabilisation Principles and Synthetic Approaches -- 4. Reactivity of M-SH Complexes -- 5. The M3S Electron Reservoir -- 6. Framework Reactions of Sulfur Bridged Organometallic Clusters -- Acknowledgements -- References -- CHAPTER 7. THIOLATES - INTRIGUING AND VERSATILE LIGANDS FOR TRANSITION METALS -- 1 . Introduction -- 2. Mononuclear Complexes with Monodentate Thiols -- 3. Polynuclear Thiolato-Complexes -- 4. Sulfide Formation by C-S Bond Cleavage -- 5. Polydentate Thiolato-Ligands -- Sulfur-Sulfur Interactions -- 6. Redox Reactions and the Electrochemistry of Thiolato-Complexes -- 7. Sterically Hindered Thiolato-Ligands -- 8. Conclusion -- References -- CHAPTER 8. METAL COMPLEXES OF SULFUR AND SULFUR-NITROGEN COMPOUNDS AND THEIR CATALYTIC PROPERTIES -- 1 . Introduction -- 2. Elemental Sulfur as a Ligand -- 3. Complexes with (CH2S)3, (CH2Se)3 and (CH20)6 -- 4. Sulfur-Nitrogen Species as Ligands -- 5. Metal-Catalyzed Formation of S(CN)4 -- Acknowledgements -- References -- CHAPTER 9. SULFIDO-COMPLEXES OF MOLYBDENUM AND TUNGSTEN: SYNTHETIC ASPECTS -- 1 . Introduction -- 2. Simple Thiometallate Anions and Their Reactions -- 3. Thiometallates as Ligands -- 4. Reactions of Thiometallates in the Presence of Thiolates -- 5. Mononuclear Complexes -- References -- CHAPTER 10. INTERACTION BETWEEN METAL CENTERS THROUGH SULFUR CONTAINING LIGANDS -- 1 . Introduction -- 2. Theoretical Background -- 3. Large Interaction between Copper(II) Ions Far Away from Each Other -- 4. Dithiooxamidato Copper(II) Dinuclear Complexes -- 5. Ab Initio Calculation of the Exchange Interaction in Dithiooxamide Complexes -- 6. Ordered Bimetallic Chains with Dithiooxalato Bridges. , 7. Magnetic Properties of Iron-Sulfur Complexes -- 8. Conclusion -- References -- CHAPTER 11. SPECTROSCOPIC ASPECTS OF SULFUR CHEMISTRY: ELECTRONIC AND RESONANCE RAMAN SPECTROSCOPY OF SULFUR-CONTAINING COMPLEXES, IONS AND RADICALS -- 1 . Introduction -- 2. Transition Metal Thiometal1ates -- 3. Electronic and RR Spectra of Sulfur-Donor Complexes -- 4. Spectroscopic Studies on Cations -- 5. Spectroscopic Studies on Sulfur Radical Anions -- 6. Conclusion -- References -- PART III: TECHNOLOGY AND CHEMISTRY WITH TECHNOLOGICAL RELEVANCE -- CHAPTER 12. SULFURIC ACID - AN IMPORTANT BASIC PRODUCT IN CHEMISTRY. PROBLEMS AND RECENT DEVELOPMENTS IN PRODUCTION -- 1 . Introduction -- 2. Acid Manufacture and Reduction of Emissions -- 3. Raw Materials -- 4. Energy Recovery -- 5. Recycling of Spent Acids and By-Products -- CHAPTER 13. CHEMICAL PROBLEMS OF FLUE-GAS DESULFURISATION -- 1. Introduction -- 2. Chemistry of Sulfur -- 3. The Problem of Changing Oxidation States of Sulfur -- 4. Proposal for a Sulfur Producing Desulfurisation Process -- References -- CHAPTER 14. METAL SULFIDES IN PHOTOVOLTAIC, PHOTOELECTROCHEMICAL AND SOLAR BIOLOGICAL ENERGY CONVERSION -- 1. Introduction -- 2. Sulfur Compounds as Solar Energy Materials -- 3. Photovoltaic Cells Based on Sulfides -- 4. Photoelectrochemical Cells Based on Sulfides -- 5. Solar Assisted Electrolysis of Water -- 6. Photocatalysis and Solar Intercalation Chemistry -- 7. Solar Biomass Based on Sulfur Cycle -- 8. Stability and Reactivity of Sulfide Materials -- 9. Conclusion -- References -- CHAPTER 15. INORGANIC CHEMISTRY RELATED TO RUBBER VULCANISATION -- 1 . Introduction -- 2. Mechanism of Sulfur Vulcanisation -- CHAPTER 16. BIODEGRADATION OF SULFUR MINERALS AND ITS APPLICATION FOR METAL RECOVERY -- 1 . Introduction -- 2. Microorganisms -- 3. Leaching Machanisms -- 4. Factors Influencing Bacterial Leaching Activity. , 5. Leaching Techniques -- 6. Conclusion -- References -- PART IV. SULFUR IN MICROBIOLOGY, BIOCHEMISTRY AND MEDICINE -- CHAPTER 17. MICROORGANISMS AND THE SULFUR CYCLE -- 1. Introduction -- 2. The Biogeochemical Sulfur Cycle -- 3. The Metabolic Types and Microbial Groups Involved in the Cycle -- 4. The Sulfuretum -- 5. Fractionation of Sulfur Isotopes by Bacteria -- References -- CHAPTER 18. PHOTOTROPHIC BACTERIA AND THEIR SULFUR METABOLISM -- 1 . Introduction -- 2. Carbon and Nitrogen Metabolism -- 3. Ecology and Technical Application -- 4. Photosynthesis -- 5. Sulfur Metabolism -- References -- Chapter 19. CYTOCHROMES AND IRON SULFUR PROTEINS IN SULFUR METABOLISM OF PHOTOTROPHIC SULFUR BACTERIA -- 1 . Introduction -- 2. Definition of Electron Transfer Proteins -- 3. Enzymatic Steps of Dissimilatory Sulfur Metabolism -- 4. Summary and Conclusion -- References -- CHAPTER 20. SULFIDE AND OTHER SULFUR-CONTAINING LIGANDS IN METALLOPROTEINS AND ENZYMES -- 1. Introduction -- 2. Natural Sulfur-Containing Ligands -- 3. Metalloproteins Containing No Sulfide Ligands -- 4. Metalloproteins with Sulfide Ligands -- References -- CHAPTER 21. GENETIC DISEASES OF SULFUR METABOLISM IN HUMANS -- 1. Introduction -- 2. Cystathionine β-Synthase Deficiency -- References -- AUTHOR INDEX -- SUBJECT INDEX.
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  • 5
    Online Resource
    Online Resource
    Milton :Taylor & Francis Group,
    Keywords: Sediment transport-Congresses. ; Electronic books.
    Description / Table of Contents: This book presents the studies on sediment transport in suspension and sediment transport in steep channels. It discusses the degradation and particle sorting processes.
    Type of Medium: Online Resource
    Pages: 1 online resource (296 pages)
    Edition: 1st ed.
    ISBN: 9781000108262
    DDC: 551.3/03
    Language: English
    Note: Cover -- Half Title -- Title Page -- Copyright Page -- Table of Contents -- Preface -- 1: Flow structure as related to sediment transport -- The influence of boundary layer turbulence on the mechanics of sediment transport -- Turbulent structure in an open-channel flow -- Sediment entrainment by a turbulent spot: A progress report -- Boundary shear stress distributions in open channel and closed conduit flows -- Visualization of the mixing layer behind dunes -- 2: Single - particle dynamics -- Resolution of equations governing the saltation motion in the air (Reparticles < -- 1) -- On the relation between size and distance travelled for wind-driven sand grains - Results and discussion of a pilot experiment using coloured sand -- On the mathematical modeling of aeolian saltation -- Forces on a single sediment grain and their dependence on the surrounding flow field -- Migration of spherical particles suspended in shear flows -- Particle dynamics equations for turbulent suspensions -- 3: Initiation, formation and behaviour of ripples and dunes -- Shape and dimensions of ripples and dunes -- Ripple formation on a bed of fine, cohesionless, granular sediment -- Sand wave formation due to irregular bed load motion -- The formation of dunes in open channel flow on an initially flattened erodible bed -- Turbulent flow over ripples and their effective roughness -- The prediction of bedforms and alluvial roughness -- The mechanism of sediment transport on bed forms -- An experimental study of bed-load transport with non-uniform sediment -- Bedforms in relation to hydraulic roughness and unsteady flow in the Rhine branches (the Netherlands) -- 4: Transport of sediment in suspension -- Turbulent diffusion of solid particles in open channel flow -- Stochastic model for particle movement in turbulent open channel flow. , Numerical modelling of sediment transport in open channel flows -- Improved numerical calculation of sedimentation for different bed-roughness and various turbulence models -- Some phenomena associated with hyperconcentrated flow -- 5: Sediment transport in steep channels -- Flow structure and sediment transport mechanics in steep channels -- Initiation of sediment transport in steep channels with coarse bed material -- Bedforms and flow resistance in steep gravel-bed channels -- First experiences measuring coarse material bedload transport with a magnetic device -- 6: Other sediment-transport problems -- Longitudinal sorting of grain sizes in alluvial rivers -- Degradation of river beds and associated changes in the composition of the sediments -- Laboratory and insitu bed shear stress measurements -- Transition in oscillatory boundary layers -- Laboratory study of breaker type effect on longshore sand transport -- Sand ripple motion under combined surface wave and current action -- Sediment transport due to waves and currents.
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 800-803 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new microwave based plasma source for high current ion beam neutralization is presented. It consists of a tapered WR340 waveguide with a directly coupled 2.45 GHz magnetron and a quartz tube of 40 mm diameter inside the waveguide confined by two graphite electrodes. The upper electrode houses the gas feed, whereas the lower electrode serves as the plasma outlet. Both electrodes can be biased independently. Tuning is done via a magnetically controlled stab inserted into the waveguide. The plasma was characterized by use of the Langmuir probe. The electron concentration of 5×1011 cm−3 at 250 W was measured. Typical electron temperature is below 2.5 eV even for pressure as low as 2×10−3 Pa. The extractable electron current is dependent on microwave power and gas flow. A limitation is caused by the ion saturation current to the negatively biased electrodes. The voltage on the electrodes allows an easy control of electron current. Maximum electron current achieved so far is 400 mA for an argon flow of 5 sccm and microwave power of 300 W. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2079-2081 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In scanning near-field optical microscopy, scanning ion conductance microscopy and for localized electrochemical deposition out of micropipettes, the detection of shear forces between the tip and sample is one of the most common methods of distance control. Here, pulled micropipettes were utilized to form an evaporating drop of water whose frictional force in air causes a specific resonance shift of the tip vibration. This resonance shift and the amplitude at the resonance were investigated with regard to their dependence on the drop diameter. In order to calculate the friction, the tip is approximated as a damped harmonic oscillator. The typical range of the shear forces in scanning probe microscopies is estimated to be between 1 pN and 0.1 nN. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 9289-9300 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper presents ion yields resulting from multiphoton ionization and fragmentation of gaseous toluene (C7H8) in the focus of an 80 fs Ti:sapphire laser beam (λ=800 nm) with a sufficiently small B-integral [Siegman, Lasers (University Science Books, Mill Valley, CA, 1986)]. The peak intensity was varied between 1.9×1013 and 2.8×1014 W cm−2, and both linear and circular polarization were used. Over the whole range of intensities studied, only the singly charged parent ion and its fragment, C7H7+, are found. Although the Keldysh adiabaticity parameter equals 0.86 for the saturation intensity of ∼1×1014 W cm−2, there is no indication of tunneling. The parent ion yield is found to be effectively proportional to the sixth power of the peak intensity. This is shown to be in good agreement with a multiple lowest-order perturbation multiphoton ionization model which takes into account successive channel closing for increasing peak intensities and orders up to 11 inclusive. On the assumption that the excess energy acquired by the toluene cation as a result of the interaction with the electromagnetic field is of the order of the ponderomotive energy for the intensity prevailing at the moment of the ionization, the internal energy distribution of the toluene cations created that is brought about by this multiple-order multiphoton ionization model is calculated. This internal energy distribution is in perfect agreement with the measured C7H7+ yield, if the rate-energy curve for the fragmentation of excited toluene cations as given by Golovin et al. [Sov. J. Chem. Phys. 2, 632 (1985)] is moderately reduced by a factor of 4.5. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 63 (2003), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: During peak spawning of sprat Sprattus sprattus in the Baltic Sea in May–June egg specific gravity averaged ±s.d. 1·00858 ± 0·00116 g cm−3 but was significantly higher in the beginning and significantly lower towards the end of the spawning season. A close relationship was found between egg diameter and egg specific gravity (r2 = 0·71). This relationship, however, changed during the spawning season indicating that some other factor was involved causing the decrease in specific gravity during the spawning period. The vertical egg distribution changed during the spawning season: eggs were distributed mainly in the deep layers early in the season, occurred in and above the permanent halocline during peak spawning, and above the halocline towards the end of the spawning season. Consequently, poor oxygen conditions in the deep layers and low temperatures in layers between the halocline and the developing thermocline may affect egg development. Thus, opportunities for egg development vary over the spawning season and among spawning areas, and depending on frequency of saline water inflows into the Baltic Sea and severity of winters, between years.
    Type of Medium: Electronic Resource
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