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  • 1
    Call number: M 10.0051
    Type of Medium: GFZ publications
    Pages: 43 S. : Ill. + 1 Beil.
    Classification:
    Geothermal Energy
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: M 11.0201
    Type of Medium: Monograph available for loan
    Pages: 40 S.
    Classification:
    Engineering
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Discrete & computational geometry 29 (NaN), S. 229-238 
    ISSN: 1432-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. The anchored hyperplane location problem is to locate a hyperplane passing through some given points P \subseteq R n and minimizing either the sum of weighted distances (median problem ), or the maximum weighted distance (center problem ) to some other points Q \subseteq R n . This problem of computational geometry is analyzed by using nonlinear programming techniques. If the distances are measured by a norm, it will be shown that in the median case there exists an optimal hyperplane that passes through at least n - k affinely independent points of Q , if k is the maximum number of affinely independent points of P . In the center case, there exists an optimal hyperplane which is at maximum distance to at least n- k +1 affinely independent points of Q . Furthermore, if the norm is a smooth norm, all optimal hyperplanes satisfy these criteria. These results generalize known results about unrestricted hyperplane location problems.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 59 (Dec. 2008), p. 177-181 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Particle reinforced metal matrix composites are developed for heat sink applications. For power electronic devices like IGBT modules (Insulated Gate Bipolar Transistor) a baseplate material with high thermal conductivity combined with a low coefficient of thermal expansion is needed. Commonly AlSiC MMC are used with a high volume content of SiC particles (~ 70 vol.%). To improve the performance of these electronic modules particle reinforced materials with a higher thermal conductivity are developed for an advanced thermal management. For this purpose highly conducting diamond particles (TC ~ 1000 W/mK) are embedded in an Al matrix. These new diamond reinforced MMC were investigated concerning their thermal fatigue mechanisms compared to the common AlSiC MMC. Differences in reinforcement architecture and their effects on thermal fatigue damage were studied by in situ synchrotron tomography during thermal cycling
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 413-418 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: AlSi7Mg/SiC/70p (AlSiC) is used for heat sinks because of its good thermal conductivitycombined with a low coefficient of thermal expansion (CTE). These properties are important forpower electronic devices where heat sinks have to provide efficient heat transfer to a coolingdevice. A low CTE is essential for a good surface bonding of the heat sink material to the insulatingceramics. Otherwise mismatch in thermal expansion would lead to damage of the bondingdegrading the thermal contact within the electronic package. Therefore AlSiC replaces increasinglycopper heat sinks. The CTE mismatch between insulation and a conventional metallic heat sink istransferred into the MMC heat sink. The stability of the interface bonding within a MMC is criticalfor its thermal properties.In situ thermal cycling measurements of an AlSi7Mg/SiC/70p MMC are reported yielding thevoid volume fraction and internal stresses between the matrix and the reinforcements in function oftemperature. The changes in void volume fractions are determined simultaneously by synchrotrontomography and residual stresses by synchrotron diffraction at ESRF-ID-15. The measurementsshow a relationship between thermal expansion, residual stresses and void formation in the MMC.The results obtained from the in situ measurements reveal a thermoelastic range up to 200 °Cfollowed by plastic matrix deformation reducing the volume of voids during heating. A reverseprocess takes place during cooling. Thus the CTE becomes smaller than according to thermoelasticcalculations. Damage could be observed after multiple heating cycles, which increase the volumefraction and the size of the voids.The consequence is localdebonding of the matrix from thereinforcement particles, whichleads to an irreversible reductionof the thermal conductivity aftermultiple heating cycles
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 34 (1969), 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: —To enable development of a model describing reaction kinetics in dehydrated foods, we studied sucrose hydrolysis at limited water concentration. Saturated sucrose solutions containing various acids and inert solid materials gave identical rate constants and energy of activation as predicted from dilute solutions. Reaction rates in freeze-dried systems humidified to low moisture contents indicated that any equation describing the rate of hydrolysis must include a term for the velocity of dissolution of solid sucrose into the surface water. The rate of hydrolysis was a pseudo first-order reaction obeying the same kinetics as in dilute solution; the rate of dissolution became rate-limiting when the initial supply of dissolved sucrose was exhausted.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 52 (2004), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The Bacillus subtilisσW regulon is induced by different stresses such as alkaline shock, salt shock, phage infection and certain antibiotics that affect cell wall biosynthesis. The activity of the alternative, extracytoplasmic function (ECF) sigma factor σW is modulated by a specific anti-sigma factor (RsiW or YbbM) encoded by the rsiW (ybbM) gene located immediately downstream of sigW. The RsiW membrane topology was determined, and a specific reporter system for RsiW function was constructed. Experiments using the yeast two-hybrid system suggested a direct interaction of σW with the cytoplasmic part of RsiW. Analysis of truncated forms of the RsiW protein revealed that σW induction by alkaline shock is dependent on both the transmembrane and the extracytoplasmic domain of RsiW. Western blot and pulse–chase experiments demonstrated degradation of RsiW after an alkaline shock. A B. subtilis mutant strain deleted for the Escherichia coli yaeL orthologue yluC, encoding a transmembrane protease, was defective in inducing a σW-controlled promoter after alkaline shock and accumulated a membrane-bound truncated form of RsiW, suggesting that the activity of σW is controlled by the proteolysis of RsiW by at least two different proteolytic steps.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 2926-2929 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Review of finance 3 (1999), S. 23-46 
    ISSN: 1573-692X
    Keywords: Ornstein–Uhlenbeck process ; Fourier inversion ; option pricing ; mean-reversion ; volatility smile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract In this paper, we reexamine and extend the stochastic volatility model of Stein and Stein (S & S) (1991) where volatility follows a mean-reverting Ornstein–Uhlenbeck process. Using Fourier inversion techniques we are able to allow for correlation between instantaneous volatilities and the underlyingstock returns. A closed-form pricing solution for European options is derived and some numerical examples are given. In addition, we discuss the boundary behaviour of the instantaneous volatility at v(t)=0 and show that S & S do not work with an absolute value process of volatility.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 481-488 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Щыло найдено, что большое число реагентов, содержащих галогены (галогениды металлов, оксигалогениды, кислотные галогениды), взаимодействуют из газовой Фазы с цеолитами, приводя к обмене ионов и вытеснению алюминия. Происходящее при этом внедрение наружных ионов в решетку возможно и теоретически. Обсуждается значение метода в приготовлении катализатора без алюминия и/или катализаторов, содержащих металл.
    Notes: Abstract A wide range of halogen containing reagents (metal halides, oxyhalides, acid halides, etc.) are found to interact from the gas phase with exchange ions of zeolites and to effect dealumination at elevated temperatures. The incorporation of extraneous ions into the framework by this technique is not impossible theoretically. The importance of the method in the preparation of dealuminated and/or metal containing catalysts is discussed.
    Type of Medium: Electronic Resource
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