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  • 1
    Electronic Resource
    Electronic Resource
    EL2 trends in As-rich GaAs grown by close-spaced vapor transport (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 1879-1883 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Deep level transient spectroscopy and transport properties measurements were performed on close-spaced vapor transport deposited epitaxial GaAs. The deep EL2 donor level was consistently observed in all of the layers. A side band at around 300 K was found to be present in relatively high concentration close to the as-grown surface of the epitaxial films. The multilevel impurity model treatments suggest the existence of an off-stoichiometry-induced deep acceptor level, related to possible gallium vacancies, in As-rich GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345617
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  • 2
    Electronic Resource
    Electronic Resource
    Relaxation Time Spectrum of Hydrogels by CONTIN Analysis (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 65 (2000), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: CONTIN is a general-purpose program for inverting noisy linear algebraic and integral equations by means of inverse Laplace transform. This study explored the application of CONTIN analysis to determine the relaxation time distribution spectra for food gels, including gellan, carrageenan, whey protein, and gelatin gels, based on stress-relaxation data. CONTIN results represent the continuous relaxation time spectra when the number of the terms in the discrete Maxwell stress-relaxation model approached infinity. The CONTIN results for gellan gels were correlated to the texture properties of gels from compression tests with respect to the effects of calcium concentrations. CONTIN analysis may be a very effective tool in elucidating the microstructural properties of a hydrogel from mechanical testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2000.tb16010.x
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  • 3
    Electronic Resource
    Electronic Resource
    Gelling Temperatures of Gellan Solutions as Affected by Citrate Buffers (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 64 (1999), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Effects of citrate buffers at pH 3.5 and 5.0 on gelling temperatures of gellan solutions with 0.4–1.8% gellan and 1.5–60 mM Ca2+were studied. Partial dissociation of the carboxyl groups in gellan polymer in pH 3.5 solutions resulted in weakened gels. The pH 3.5 buffer exhibited weak chelating ability for Ca2+. The gelling temperature of gellan solutions at pH 3.5 was quantitatively related to polymer and cation concentrations using a similar model to that for gellan water solutions. The pH 5.0 buffer exhibited strong chelating ability. Gelling temperatures at pH 5.0 were generally lower than those at pH 3.5, except at low calcium concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1999.tb15103.x
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  • 4
    Electronic Resource
    Electronic Resource
    Three dimensional superlattice in Pb"1"-"χGd"χTe (Wigner's crystallization)
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 93 (1991), S. 391-394 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(91)90367-J
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  • 5
    Electronic Resource
    Electronic Resource
    Cell Culture Studies on Neurofibromatosis (von Recklinghausen) (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 486 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb48089.x
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  • 6
    Electronic Resource
    Electronic Resource
    1H broad-line and MAS NMR: application to the study of acid sites of desilicated zeolite ZSM-5 (1995)
    Springer
    Catalysis letters 34 (1995), S. 139-149 
    Details
    ISSN: 1572-879X
    Keywords: solid state proton NMR ; zeolite ZSM-5 ; desilication ; surface acidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Broad-line1H NMR study of desilicated zeolite ZSM-5 was carried out as a function of the number of adsorbed water molecules in amounts lower than or equal to that of the Brønsted acid sites. The dissociation coefficient of the acid OH groups, currently associated with the acid strength, was shown not to be affected by the selective removal of Si from the zeolite ZSM-5 framework which resulted in more Brønsted acid sites per unit surface area. On the other hand, by using MAS NMR, bridging Brønsted acid sites hydrogen-bonded to the zeolite framework were identified on the “anhydrous” surface of the desilicated ZSM-5. Moreover, MAS NMR spectra of the desilicated zeolite partially rehydrated showed the presence of some Lewis acid sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808330
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of methyl terbutyl ether (MTBE) over triflic acid loaded ZSM-5 and y zeolites (1990)
    Springer
    Catalysis letters 6 (1990), S. 321-330 
    Details
    ISSN: 1572-879X
    Keywords: MTBE ; gas phase synthesis ; triflic acid loaded zeolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Triflic acid loaded Y-type zeolite appears to be as active as the Amberlysi 15 in the (gas phase) synthesis of MTBE. However, the zeolite catalyst produces less by-products and is more thermally stable than the resin based catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00763998
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  • 8
    Electronic Resource
    Electronic Resource
    Aromatization of n-butane over new LD-HBS catalysts. Effect of the gallium oxide support (1990)
    Springer
    Catalysis letters 6 (1990), S. 23-32 
    Details
    ISSN: 1572-879X
    Keywords: Aromatization ; butane ; hydrogen ; spillover ; hybrid catalysts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract It is shown that even “pure” quartz, other silicas or aluminas can enhance the aromatization activity of a ZSM-5 zeolite. Incorporation of gallium oxide onto these supports increases further the production of aromatics. The use of supported gallium oxide co-catalyst obtained by co-evaporation of a colloidal silica and a Ga salt has led to extremely high aromatization performance for the hybrid catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764049
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  • 9
    Electronic Resource
    Electronic Resource
    Production of porous materials by dealumination of Ca-A zeolite (1995)
    Springer
    Journal of porous materials 1 (1995), S. 175-183 
    Details
    ISSN: 1573-4854
    Keywords: mesoporous materials from Ca-A zeolite by dealumination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Three conventional methods of dealumination were tested on the alumina-rich Ca-A zeolite. The mild acid leaching and the hydrothermal treatment led to mesoporous materials with a sharp distribution of pore size in the 4 nm region. On the other hand, treatment with ammonium hexafluorosilicate resulted in materials with mesopores of 12 nm in size. The latter technique produced the best thermally resistant materials which exhibited also the largest void volume and the highest cation exchange capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486656
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  • 10
    Electronic Resource
    Electronic Resource
    Rapid determination of vapor adsorption properties of ultramicroporous solids: An application to the zeolite affinity of adsorption (1979)
    Springer
    Reaction kinetics and catalysis letters 12 (1979), S. 69-76 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Адсорбционная емкость цеолитов была быстро определена с помощью аппарата паровой сорбции, который может быть использован в качестве ультрамикропорозиметра. Из сорбционных данных можно определить сродство цеолитов к различным адсорбатам по сравнению с водой. Фактор сродства н-гексана новых ZSM цеолитов всегда выше, чем для X, Y или Цеолон цеолитов. Этот факт приписывается необычной сетчатой структуре ZSM цеолитов, богатых кремнием.
    Notes: Abstract Adsorption capacities of zeolites are rapidly determined by a vapor sorption apparatus which can be used as an ultramicroporosimeter. From the sorption data, it is possible to calculate the zeolite affinities toward various adsorbates in comparison with water. The n-hexane affinity index of the new ZSM zeolites has values always higher than those of X, Y or Zeolon zeolites. This fact is attributed to the unusual framework structure of the silica-rich ZSM zeolites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02071427
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