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  • 1
    Electronic Resource
    Electronic Resource
    Differential rates of cerebral maturation between sexes (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 140-140 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Medical records are available for 48 children who were referred to the Neurosurgical Unit at the Radcliffe Infirmary, Oxford, over the past 20 years, and who were diagnosed as suffering from congenital hydrocephalus. In most cases there was no associated spina bifida cystica or other complex ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254140a0
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  • 2
    Electronic Resource
    Electronic Resource
    The Magnetic Properties of the Cobalt Oxide–Alumina System (1958)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 62 (1958), S. 1153-1157 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150568a001
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  • 3
    Electronic Resource
    Electronic Resource
    Origin of superparamagnetism in nickel oxide (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6977-6982 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It has been known for some time that particles of nickel oxide of less than about 100 nm in size show superparamagnetism that increases as the particle size decreases. The origin of the particle magnetic moment responsible for this behavior has never been fully explained. This research indicated that the size of the particle rather than the presence of nonstoichiometry or impurities of reduced nickel determines the moment. The critical experiment was the measurement of magnetization versus magnetic field for a sample of nickel oxide prepared under conditions that preclude metallic nickel. Almost identical results were found for the original sample, which was black in color and thus nonstoichiometric, and after mild reduction in hydrogen at 400 K, which produced stoichiometry and changed the color to green. The magnetic susceptibility was inversely proportional to the particle size for a given method of preparation. This is consistent with a simple model of incomplete edges on the bounding planes of the crystallite and provides a possible basis for a practical method for measuring particle size in nickel oxide-containing samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349826
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic Study of Cobalt Molybdenum Oxide Catalysts (1964)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 3 (1964), S. 154-158 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160010a012
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  • 5
    Electronic Resource
    Electronic Resource
    A gender comparison of contextualised study behaviour in higher education (1994)
    Springer
    Higher education 27 (1994), S. 469-485 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract The present study examines the manifestation of structural differences in the manner in which men and women students perceive and engage the content and context of learning. These differences are explored, and shown to be consistent, within a hierarchy of progressively more complex conceptual models of student learning. Conclusions are that structural gender variation differences emerge in terms of deep/strategic rather than surface, forms of learning behaviour: men students distinctively manifest and qualify deep/strategic learning behaviour in terms of operation and comprehension learning styles, while women students integrate these styles in a manifestation of style versatility that is clearly organised and not achievement motivated. An apparently separate female trait is distinguishable in terms of comprehension learning style and achievement motivation. It is argued that gender differences constitute a potentially important and neglected source of variation in student learning which, when detected in context, can and should be explicitly managed by academic practitioners.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384905
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamics of a sodium heat pipe reforming reactor (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 743-752 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A prototype of a sodium heat pipe reactor for steam reforming processes has been developed and tested at energy levels up to 6 kW. Both experimental and model simulation data were obtained. Temperature profiles at nonflow and nonreaction flow conditions were used to adjust the parameters of the model, along with an intrinsic rate equation measured in a differential, bench-scale apparatus.Very good agreement between experiment and model was found for approximately 50 runs under steady state reaction conditions covering a range of process variables. Advantages of the heat pipe as a reactor energy source were confirmed. These include isothermal wall temperatures, energy flux transformation, adjusted flux profiles, and rapid startup. These measurements and computations have provided a model from which optimized configurations have been determined.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690340505
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  • 7
    Electronic Resource
    Electronic Resource
    A new route to synthesize La1−xSrxMnO3 (2000)
    Springer
    Journal of materials science 35 (2000), S. 3599-3606 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Self-Propagating High-temperature Synthesis (SHS) was used to producecomplex oxides (La1−x Sr x MnO3 with x = 0, 0.1 and 0.2), which are used as the cathode in solid oxide fuel cells (SOFCs). Thermodynamic predications and experiments show that La1−x Sr x MnO3 can be prepared via SHS under moderate conditions from a mixture of La2O3 + SrO2 + Mn, using either gaseous oxygen or solid NaClO4 as the oxidant. Partial melting at the high combustion temperature increased product homogeneity. The electrical conductivity of the product was 180 S·cm−1 at 1000°C in air, matching that of sample made by other synthesis processes. SHS enables a more economical production of La1−x Sr x MnO3 than existing commercial processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004821831693
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  • 8
    Electronic Resource
    Electronic Resource
    Reaction characteristics of La0.84Sr0.16CrO3 formation (1999)
    Springer
    Journal of materials science 34 (1999), S. 3035-3041 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We studied the kinetics of La0.84Sr0.16CrO3 formation from a precursor consisting of La and Sr chromium oxides and carbonates made by spray roasting. Pure LaCrO3 becomes cubic at temperatures exceeding 1900 °C. Strontium doping lowers the transition temperature, for example, that of La0.84Sr0.16CrO3 is 1700 °C. This transition is gradual and occurs over a 700 °C range upon heating and cooling. Low temperature (LT) air calcination (450 °C) of the precursor yields a mixture of LaCrO4 and SrCrO4, which following 20 h of heating at 1440 °C produces a homogeneous powder. Secondary electron images of this precursor reveal dense spheres with 95% of the theoretical density of La0.84Sr0.16CrO3. High temperature (HT) calcination (800 °C) yields a mixture of LaCrO3 and SrCrO4, which following 40 h of heating at 1500 °C produces a uniform product. The LT and HT calcination causes oxygen loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004676210960
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of CO2 concentration on YBa2Cu3O6+x formation (1997)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 43 (1997), S. 1091-1099 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Two reversible reactions are involved in YBa2Cu3O6+x formation: a reaction between BaCO3 and CuO forming BaCuO2 and CO2, and a reaction of BaCuO2 with Y2O3 and CuO forming YBa2Cu3O6 which undergoes phase transformation to YBa2Cu3O6+x upon cooling. In-situ isothermal time resolved HT-XRD of a thin film was used to quantify the effect of CO2 on the kinetics of the first reaction. Increased CO2 partial pressure shifts the reactions to higher temperatures. At high CO2 partial pressure (〉2 vol. %), the rate of the first reaction becomes essentially a step process with a very high activation energy. Noninstantaneous nucleation of the reaction products occurs at low CO2 partial pressure (0.5-1%) and temperatures (700°C). The data fit a 2-D diffusion-controlled mechanism with a zero nucleation rate for BaCO3 decomposition and a second-order nucleation rate for YBa2Cu3O6 formation. A comparison of the kinetics of a thin film (10 mm) as determined by HT-XRD with those of a thick sample (2 mm) determined by TG revealed that the transport of CO2 within the sample pores and to the ambient gas significantly affect the decomposition of BaCO3. For example, the formation of YBa2Cu3O6 in a thick precursor layer occurs in the 840 to 940°C range, exceeding by about 200°C that in which it is formed in thin films.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690430422
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  • 10
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    Chemomagnetic fields produced by solid combustion reactions (1999)
    American Institute of Physics
    Details
    Publication Date: 1999-08-23
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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