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  • 1
    Electronic Resource
    Electronic Resource
    Chiral (Salen) Complexes Encapsulated in Mesoporous ZSM-5 as an Optical Active Catalyst for Asymmetric Phenolic Ring Opening of Terminal Epoxides (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1809-1812 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: ZSM-5 was modified by alkaline and acidic solution to introduce mesoporosityin the crystals. Heterogenized Co(III) salen was prepared in the mesopores of ZSM-5 by‘ship-in-a-bottle’ method. Phenolic ring opening of epoxides was performed successfullyby using encapsulated chiral salen catalysts. Very high enantioselectivity and conversionwere obtained in PKR reaction by immobilized catalysts
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1809.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    An exact analysis of the optical Kerr effect for an arbitrary field strength including nonlinear effects (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5628-5632 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An optical Kerr effect, which is the transient electric birefringence of isotropic molecular fluids when the molecules align themselves with external field, is investigated. Calculations have been carried out on the rotational diffusion of rod-like molecules in the presence of an arbitrary field strength. We will provide an exact recurrence relation with nonlinear effects and this recurrence relation is solved numerically to see how the nonlinearity affects the answer for various field strengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457565
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of surface morphology of Ni thin film on the growth of aligned carbon nanotubes by microwave plasma-enhanced chemical vapor deposition (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4898-4903 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Aligned carbon nanotubes were synthesized on Ni-coated Si substrates using microwave plasma-enhanced chemical vapor deposition. The surface morphology of Ni thin films was varied with the rf power density during the rf magnetron sputtering process. It was found that the growth of carbon nanotubes was strongly influenced by the surface morphology of Ni thin film. Pure carbon nanotubes were synthesized on Ni thin film with uniformly distributed grain sizes, whereas large amounts of carbonaceous particles were produced in addition to the nanotubes, when the nanotubes were grown on Ni thin film with widely distributed grain sizes. With decreasing Ni-grain size, the diameter of nanotubes decreased and the length increased. High-resolution transmission electron microscope images clearly demonstrated the nanotubes to be multiwalled, and the graphitized structures were confirmed from the Raman spectra. Efficient field emission was observed from the diode structure with the nanotube tips. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1314614
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrogen storage in single-walled carbon nanotubes (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 2877-2879 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We perform density-functional calculations to search for hydrogen adsorption sites and predict maximum storage capacity in single-walled carbon nanotubes. We find two chemisorption sites at top sites of the exterior and the interior of the tube wall. We further find that a form of H2 molecule can exist in an empty space inside nanotubes. The storage capacity of hydrogen in an empty space increases linearly with tube diameter. The maximum storage capacity is limited by the repulsive energies between H2 molecules inside nanotubes and those between H2 molecules and the tube wall. We predict that hydrogen storage capacity in (10,10) nanotube can exceed 14 wt % (160 kg H2/m3). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126503
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  • 5
    Electronic Resource
    Electronic Resource
    Controlling the diameter, growth rate, and density of vertically aligned carbon nanotubes synthesized by microwave plasma-enhanced chemical vapor deposition (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 2367-2369 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Vertically aligned carbon nanotubes were synthesized on Ni-deposited Si substrates using microwave plasma-enhanced chemical vapor deposition. The grain size of Ni thin films varied with the rf power density during the rf magnetron sputtering process. We found that the diameter, growth rate, and density of carbon nanotubes could be controlled systematically by the grain size of Ni thin films. With decreasing the grain size of Ni thin films, the diameter of the nanotubes decreased, whereas the growth rate and density increased. High-resolution transmission electron microscope images clearly demonstrated synthesized nanotubes to be multiwalled. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126348
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  • 6
    Electronic Resource
    Electronic Resource
    Erratum: "Hydrogen storage in single-walled carbon nanotubes" [Appl. Phys. Lett. 76, 2877 (2000)] (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 184-184 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1489492
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature-dependent critical layer thickness for strained-layer heterostructures (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2212-2214 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We systematically analyze the stress-strain-temperature relationships and include thermal strain contributions to the misfit-strain only formalism of strained-layer heterostructures. Application of this theory to the GexSi1−x/Si (100) and InxGa1−xAs/GaAs (100) system demonstrates that the thermal effect lowers the critical layer thickness significantly on both systems, in excellent agreement with experimentally measured values. Empirical formulae of the critical layer thickness in terms of a mole fraction and temperature for these systems are provided. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115106
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  • 8
    Electronic Resource
    Electronic Resource
    Seasonal adaptation of thermal and metabolic responses in men wearing different clothing at 10° C (1993)
    Springer
    International journal of biometeorology 37 (1993), S. 36-41 
    Details
    ISSN: 1432-1254
    Keywords: Seasonality ; Clothing ; Rectal temperature ; Skin temperature ; Thermal sensation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Thermoregulatory responses at ambient temperatures of 20 and 10° C in six male subjects wearing two different kinds of clothing were compared between summer and winter. The two different kinds of clothing were one insulating the upper half of the body lightly and the lower half of the body heavily (clothing A, the weight in the upper and lower halves of the body being, respectively, 489 g and 1278 g) and the other insulating the upper half of the body heavily and the lower half of the body lightly (clothing B: 1212 g and 559 g). The major findings are summarized as follow. (i) Rectal temperature was kept significantly higher in clothing B than in clothing A both in summer and winter. (ii) The fall of rectal temperature was significantly greater in summer than in winter in both types of clothing. (iii) Mean skin temperatures and skin temperatures in the face, chest, thigh and leg were significantly lower atT a of 10° C in summer than in winter in clothing A, while skin temperatures in the face and thigh were also significantly lower atT a of 10° C in summer than in winter in clothing B. (iv) Metabolic heat production was higher in summer than in winter at 20 and 10° C in both types of clothing. (v) The subjects felt cooler and colder toT a of 10° C in summer than in winter in both types of clothing. These different responses occurring between summer and winter are discussed mainly in terms of total conductance and dry heat loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212765
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  • 9
    Electronic Resource
    Electronic Resource
    A Study of Biodegradable Superabsorbent Materials Based on Acrylonitrile Grafted Sodium Alginate (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 277-279 (Jan. 2005), p. 450-454 
    Details
    ISSN: 1013-9826
    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: Biodegradable superabsorbents, hydrolyzed AN(acrylonitrile)-grafted-SA(sodium alginate) copolymers were prepared in this study by graft copolymerization of acrylonitrile on sodium alginate and the subsequent hydrolysis of the resulting grafted copolymer. The absorbency was found to significantly depend on the % add-on, graft copolymerization conditions and hydrolysis conditions. The optimum condition for graft copolymerization to obtain the maximum % add-on (64.5%) was 4g SA, 12g AN, and 8.42g H2O2 in 100ml water at 70 oC for 10hr., respectively. The optimum hydrolysis conditions for the graft copolymer (64.5 % add-on) to reach the maximum water absorbency (2518g/g), saline absorbency (1558g/g), and WRV (288g/g) is 1g graft copolymer in 10 ml aqueous NaOH (1.0N) at 110 oC for 1 hr. Furthermore, this hydrolyzed AN-graft-SA showed agood biodegradability in enzymatic hydrolysis tests when compared with commercial superabsorbent materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.277-279.450.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Solid-state interdiffusion mechanism in strained Si1–xGex/Si heterostructures (1997)
    Springer
    Journal of solid state electrochemistry 1 (1997), S. 221-226 
    Details
    ISSN: 1433-0768
    Keywords: Key words SiGe heterointerface ; Thermal interdiffusion ; Dislocation ; DCXD ; MBE growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The interdiffusion in a low-strained Si0.93Ge0.07/Si epilayer was analyzed by double-crystal X-ray diffraction. The interdiffusion was characterized by a low diffusion barrier of 1.81 eV with a diffusion constant of 4.3 × 10−5 cm2/sec, which indicates correlation with the stacking fault generated by the homoepitaxial growth of the Si layer prior to the growth of the strained SiGe layer. At the very low-strained layer, the driving force causing the interdiffusion is the concentration gradient, and the mechanism is self-diffusion of Si. Furthermore, the interdiffusion mechanisms were classified into three groups, depending on the Ge mole fraction x. For x 〈 0.2, the diffusion process in the SiGe alloy is similar to a self-diffusion of Si atoms, while, for 0.2 〈 x 〈 0.4, Ge atoms prefer to be diffused out from the alloy. Finally, for x 〉 0.4, Si atoms can be diffused into the alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100080050052
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