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  • Chemistry  (9)
  • Electronic structure and strongly correlated systems  (6)
  • 1
    Publication Date: 2017-09-06
    Description: Author(s): C. W. Tseng, C. N. Kuo, H. W. Lee, K. F. Chen, R. C. Huang, C.-M. Wei, Y. K. Kuo, and C. S. Lue We report a study of the temperature-dependent electrical resistivity, Seebeck coefficient, thermal conductivity, specific heat, and Al 27 nuclear magnetic resonance (NMR) in Heusler-type Ru 2 TaAl , to shed light on its semimetallic behavior. While the temperature dependence of the electrical resistivi... [Phys. Rev. B 96, 125106] Published Tue Sep 05, 2017
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 2
    Publication Date: 2016-09-22
    Description: Author(s): Y. J. Pu, Z. C. Huang, H. C. Xu, D. F. Xu, Q. Song, C. H. P. Wen, R. Peng, and D. L. Feng Iron chalcogenide superconductors are multiorbital materials with strong electron correlations. Here we use angle-resolved photoemission spectroscopy to study orbital dependent correlation effects in single-layer FeSe / Nb : BaTiO 3 / KTaO 3 , an iron chalcogenide superconductor with high interfacial superco… [Phys. Rev. B 94, 115146] Published Wed Sep 21, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
    Publication Date: 2018-12-19
    Description: Author(s): A. Singh, H. Y. Huang, Y. Y. Chin, Y. F. Liao, T. C. Huang, J. Okamoto, W. B. Wu, H. J. Lin, K. D. Tsuei, R. P. Wang, F. M. F. de Groot, C. N. Kuo, H. F. Liu, C. S. Lue, C. T. Chen, D. J. Huang, and A. Chainani We study the electronic structure of the skutterudite Ce 3 Co 4 Sn 13 , which is known to exhibit a charge density wave (CDW) transition, at temperature T C D W ∼ 160 K, coupled to a metal-to-metal transition. We use temperature dependent hard x-ray photoemission spectroscopy (HAXPES) and x-ray absorption spec... [Phys. Rev. B 98, 235136] Published Tue Dec 18, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 1 (1955), S. 410-412 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 95-103 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Measurements were taken of the viscoelastic properties of six polymer melts by mean of the Weissenberg rheogoniometer and the Han slit/capillary rheometer. Polymers in vestigated were three high-density polyethylenes of different polydispersity, a low-density polyethylene, a polypropylene, and a polystyrene. The range of shear rates tested was from about 5.0 × 10-3 to 10 sec-1 with the Weissenberg rheogoniometer, from about 10 to 102 sec-1 with the slit rheometer, and from about 102 and 103 with the capillary rheometer: the temperature of measurement was 200°C. The three different apparatuses give consistent results over almost six decades of shear rates, yielding satisfactory correlations of shear viscosity to shear rate and of normal stress difference to shear rate.
    Additional Material: 2 Ill.
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  • 6
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Um ein „härtbares“ Harz zu erhalten, das nur aus Kohlenstoff und Wasserstoff besteht, wurde ein Xylol-Formaldehyd-Harz (XF-Harz) mit einem Kohlenwasserstoff (CH) wie folgt umgesetzt: Es wurde dabei angenommen, daß hierbei eine elektrophile Substitution erfolgt. Auf der Suche nach reaktionsfähigen Kohlenwasserstoffen wurden 15 verschiedene aromatische Verbindungen in Gegenwart von Perchlorsäure mit Formaldehyd umgesetzt. Dabei reagierten Acenaphthen, Polyacenaphthylen, Anthracen und Mesitylen leicht mit Formaldehyd. Es wurden nunmehr XF-Harze hergestellt und mit den erwähnten aromatischen Kohlenwasserstoffen umgesetzt. Dabei waren Acenaphthen, Polyacenaphthylen und Acenaphthen-Formaldehydharz besonders wirksam.Da ein ω,ω'-Dimethylol-XF-Harz bei der Umsetzung noch wirksamer als ein normales Harz sein sollte, wurde eine brauchbare Methode für die Herstellung eines ω,ω'-Dimethylol-XF-Harzes entwickelt. Durch Umsetzung des ω,ω'-Dimethylol-XF-Harzes mit Acenaphthen-Formaldehyd-Harz in Gegenwart von Xylolsulfonsäure wurde schließlich ein gezielt vernetztes Harz erhalten, das nur aus Kohlenstoff und Wasserstoff bestand. Es ist unschmelzbar und in Benzol unlöslich.(Unter geänderten Bedingungen kann auch Anthracen oder Mesitylen das XF-Harz vernetzen).
    Notes: A study to obtain a resin consisting only of carbon and hydrogen and yet having thermosetting properties was made. The process was a reaction of xylene-formaldehyde resin (XF-resin) with a hydrocarbon (CH) The reaction was assumed to proceed through an electrophilic substitution. To find some reactive hydrocarbons, 15 different aromatic hydrocarbons have been reacted with formaldehyde in the presence of perchloric acid. It was found that acenaphthene, acenaphthylene, anthracene and mesitylene easily reacted with formaldehyde. Some XF-resins were prepared, and reacted with the mentioned aromatic hydrocarbons.Of these hydrocarbons, acenaphthene, polyacenaphthylene and acenaphthene-formaldehyde resin were especially effective.It is understandable that an ω,ω'-dimethylol-XF-resin is more effective than a normal XF-resin. So an useful method for the synthesis of the ω,ω'-dimethylol-XF-resin was investigated.By the reaction of ω,ω'-dimethylol-XF-resin with acenaphthene-formaldehyde resin in the presence of xylene sulfonic acid, the desired cured resin was obtained. The resin consisted only of carbon and hydrogen. It was insoluble in benzene and non-melting. (However, by changing the conditions, anthracene or mesitylene can also cure XF-resins).
    Additional Material: 32 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 357-366 
    ISSN: 0887-624X
    Keywords: surface graft copolymerization ; adhesive-free adhesion ; polycarbonate ; XPS ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The surfaces of ozone-pretreated polycarbonate films were subjected to further modification by thermally induced graft copolymerization with acrylic acid (AAc), sodium salt of styrene sulfonic acid (NaSS), N,N-dimethylacrylamide (DMAA), N,N-(dimethylamino)ethyl methacrylate (DMAEMA) and 3-dimethyl(methacryloyl ethyl)-ammonium propanesulfonate (DMAPS) monomers. The structure and composition at the copolymer interface were studied by angle-resolved X-ray photoelectron spectroscopy (XPS). For polycarbonate films with a substantial amount of grafted polymer, the hydrophilic graft penetrates or becomes partially submerged beneath a thin surface layer of dense substrate chains. This microstructure was further supported by the water contact angle measurements. Adhesive-free adhesion studies revealed that the AAc, DMAA or DMAPS graft copolymerized polycarbonate film surface adhered strongly to another similarly modified surface (homo-interface) when brought into direct contact in the presence of water and subsequently dried. The development of the lap shear strength is dependent on the concentration of the surface graft, the microstructure of the grafted surface, the adhesion (drying) time, and the nature of the interfacial interaction. The simultaneous presence of chain entanglement and electrostatic interaction readily results in substantially enhanced adhesion strengths between two DMAPS graft copolymerized surfaces or between an AAc and a DMAA graft copolymerized surface (hetero-interface). XPS analyses of the delaminated surfaces suggest that failure occurred cohesively below the graft-substrate interface. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 357-366, 1998
    Additional Material: 8 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 223-230 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The transport equations for a power law fluid are used to solve the transient and non-isothermal problem of filling a disk-shaped cavity. Using the results obtained it is possible to predict gate pressures, fill times and short shots. Furthermore, the velocity and temperature fields can be obtained throughout the filling process. This information specifies the formation of a frozen surface layer during filling. Rigid PVC was primarily used in the simulations, but some results are also given for linear polyethylene, nylon 6-6, ABS and polystyrene.
    Additional Material: 13 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 23 (1983), S. 910-922 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The five independent elastic moduli C11, C12, C13, C33, and C44 for uniaxially drawn polyoxymethylene with draw ratio λ = 1-16 have been measured from -60 to 120°C by an ultrasonic method at 10 MHz. Wide angle x-ray diffraction and birefringence measurements indicate that the chains in the crystalline regions are fully aligned at λ = 5 but the degree of amorphous orientation increases steadily up to the highest draw ratio. Below the major amorphous γ relaxation (∼0°C at 10 MHz), only the axial longitudinal and tensile modulus, C33 and E0, show large increases. At 120°C, however, all the moduli increase with λ, with E0, E90 (transverse tensile modulus), C44 (axial shear modulus) and C66 (transverse shear modulus) increasing 10, 2.5, 3, and 2.5 times, respectively, as λ rises from 1 to 16. This improvement in mechanical properties may be attributed largely to the effect of taut tie-molecules and crystalline bridges. Whereas the two-parameter model of Seferis seems to be valid only below the γ relaxation, the Halpin-Tsai equation can give a reasonable description of the mechanical behavior for the highly oriented samples (λ〉5) over the entire temperature range.
    Additional Material: 21 Ill.
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  • 10
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Detailed methodology is described for the reproducible preparation of collagen-glycosaminoglycan (GAG) membranes with known chemical composition. These membranes have been used to cover satisfactorily large experimental full-thickness skin wounds in guinea pigs over the past few years. Such membranes have effectively protected these wounds from infection and fluid loss for over 25 days without rejection and without requiring change or other invasive manipulation. When appropriately designed for the purpose, the membranes have also strongly retarded wound contraction and have become replaced by newly synthesized, stable connective tissue. In our work, purified, fully native collagen from two mammalian sources is precipitated from acid dispersion by addition of chondroitin 6-sulfate. The relative amount of GAG in the coprecipitate varies with the amount of GAG added and with the pH. Since coprecipitated GAG is generally eluted from collagen fibers by physiological fluids, control of the chemical composition of membranes is arrived at by crosslinking the collagen-GAG ionic complex with glutaraldehyde, or, alternately, by use of high-temperature vacuum dehydration. Appropriate use of the crosslinking treatment allows separate study of changes in membrane composition due to elution of GAG by extracellular fluid in animal studies from changes in composition due to enzymatic degradation of the grafted or implanted membrane in these studies. Exhaustive in vitro elution studies extending up to 20 days showed that these crosslinking treatments insolubilize in an apparently permanent manner a fraction of the ionically complexed GAG, although it could not be directly confirmed that glutaraldehyde treatment covalently crosslinks GAG to collagen. By contrast, the available evidence suggests strongly that high-temperature vacuum dehydration leads to formation of chemical bonds between collagen and GAG. Procedures are described for control of insolubilized and “free” GAG in these membranes as well as for control of the molecular weight between crosslinks (Mc). The insolubilized GAG can be controlled in the range 0.5-10 wt. % while “free” GAG can be independently controlled up to at least 25 wt. %; Mc can be controlled in the range 2500-40,000. Studies by infrared spectroscopy have shown that treatment of collagen-GAG membranes by glutaraldehyde or under high-temperature vacuum does not alter the configuration of the collagen triple helix in the membranes. Neither do these treatments modify the native banding pattern of collagen as viewed by electron microscopy. Collagen-GAG membranes appear to be useful as chemically well-characterized, solid macromolecular probes of biomaterial-tissue interactions.
    Additional Material: 8 Ill.
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