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  • 1
    Electronic Resource
    Electronic Resource
    Conformational motion in bacteriorhodopsin: the K to L transition (1991)
    s.l. : American Chemical Society
    Biochemistry 30 (1991), S. 394-400 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00216a013
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  • 2
    Electronic Resource
    Electronic Resource
    Dielectric Properties and Phase Transition of [110]-Oriented 0.68PMN-0.32PT Single Crystals Induced by Temperature and DC Electric Field (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 42-45 
    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: The dielectric response of [110]-oriented 0.68PMN-0.32PT single crystal under dc electricfield has been investigated. The characteristics of phase transition under temperature and dc electric fieldare provided. When electric field is above 2.3kV/cm, abnormal phase transition is induced by temperatureand electric field, which corresponds to the phase transition from rhombohedral to orthorhombicferroelectric phase. With increasing dc electric field, the stable temperature region of orthorhombic phaseis expanded. The electric field-temperature (E-T) phase diagram of [110]-oriented 0.68PMN-0.32PTsingle crystals is presented. The polarization rotation in [110]-oriented single crystal is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.42.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Phenolic Resin on the Basic Properties of Woodceramics and Biomorphic SiC Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1878-1881 
    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: Biomorphic SiC ceramics were fabricated by infiltrating liquid silicon into woodceramicswhich were prepared from beech and pine impregnated with phenolic resin (PR) of different viscosity inorder to reinforce the cell wall of wood. The viscosity of phenolic resin was adjusted by ethanol accordingto the weight ratio of PR to ethanol. The samples not impregnated with resin were compared. Effect ofviscosity of phenolic resin on the dimension shrinkage, weight loss, porosity and the axial and radialflexural strength were investigated. Microstructural observation and phase identification of woodceramicsand biomorphic SiC were performed by SEM and XRD, respectively. The results show that, thelower the viscosity of phenolic resin was, the higher the dimension shrinkage, weight loss and porosity ofwoodceramics were. Biomorphic SiC was a diphase composite consisting of major phase β-SiC andsecondary phase Si. Woodceramics made from pine swelled or broke and strength of woodceramicsfabricated from beech declined when higher viscosity resins were impregnated. The flexural strength ofbiomorphic SiC increased with increasing in viscosity of PR. The axial flexural strength was significantlyhigher than the radial flexural strength because of anisotropic pore microstructures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1878.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Biomorphic SiC Ceramics Prepared by Organic Template Method (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 167-172 
    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: Dense SiC/Si ceramics were prepared by a silicon melt infiltration method. Highly porousSiC ceramics with a wood-like microstructure were prepared by silica sol infiltration andcarbothermal reduction reaction. Furthermore, laminated SiC/Si composites were also prepared bythe carbonization and silicon melt infiltration of stacked papers. The microstructure andcharacteristics for this series of materials were determined and compared
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.167.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Hydride abstraction by NO+ from ethanol: Effects of collision energy and ion rotational state (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 3002-3010 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effects of NO+ rotational state and collision energy on the reaction NO++C2H5OH→HNO+C2H4OH+ were studied in a guided-ion-beam instrument over the collision energy range from 50 meV to 3.7 eV. Integral cross sections for the reaction are presented. NO+ is prepared in specific rotational levels (N+=0,1 and N+=10) by means of mass-analyzed threshold ionization. Ab initio calculations were used to probe stationary points on the potential energy surface. The reaction is sharply inhibited by collision energy, suggesting a bottleneck for reaction. If rotational energy had a similar effect, ∼50% inhibition from N+=10 excitation would be observed at low collision energy. Instead, rotation is found to have no effect within experimental error. A precursor complex mechanism is proposed to explain the results. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1286917
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  • 6
    Electronic Resource
    Electronic Resource
    Complex formation, rearrangement, and reaction in PhOH++ND3: Vibrational mode effects, recoil velocities, and ab initio studies (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 4158-4170 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrationally mode-selected phenol cations (C6H5OH+ and C6D5OH+) were reacted with ND3 in a guided-ion-beam instrument. Integral cross sections and recoil velocity distributions are reported as a function of collision energy and vibrational state. Three reactions are observed. A small signal is found for the [PhOH:ND3]+ adduct at low total energies, indicating the formation of a very long-lived complex. The major reaction is H/D exchange, generating PhOD++ND2H. Exchange is ∼40% efficient at low energies, strongly inhibited by collision energy, and strongly enhanced by excitation of PhOH+ vibrations. Recoil velocity distributions suggest that H/D exchange proceeds through a statistical complex at all energies. A precursor complex is invoked to explain the energy and vibrational state dependence. The endoergic proton transfer reaction is a minor channel at all energies, with dynamics intermediate between the direct and complex limits. Quantum chemistry and RRKM calculations are reported, providing an additional mechanistic insight. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288519
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  • 7
    Electronic Resource
    Electronic Resource
    Proton transfer in the [phenol-NH3]+ system: An experimental and ab initio study (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 5717-5721 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Mass-analyzed threshold ionization (MATI) has been used to prepare phenol cations in selected vibrational states, including the ground state. Reactions of ground state C6H5OH+ with ND3, studied in a guided ion-beam apparatus, are reported, along with related ab initio calculations. This paper focuses on the energetics and product branching in the proton transfer (PT) channel. Based on thermochemistry in the literature, combined with calculations of the intracomplex PT barrier, PT was expected to make up a large fraction of the total reactive scattering. Experimentally, it is found that PT has a small cross section with clear threshold behavior, and the conclusion is that the PT reaction is endoergic by 4.5±1 kcal/mole. Assuming that NH3 has a proton affinity of 204.0 kcal/mole, this results in a proton affinity for phenoxy radical of 208.7 kcal/mole, and a neutral PhO–H bond energy of 91.1 kcal/mole. The results are used to reinterpret previous dissociative photoionization studies of phenol-ammonia complexes. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481146
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  • 8
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of mass selected clusters of Sr+ solvated by H2O and D2O (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 8469-8480 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we present the results of spectroscopic studies on mass selected Sr+(H2O)n, n=1–4 and Sr+(D2O)n, n=1–6 clusters. Mass spectra of nascent clusters formed in our laser vaporization source show that hydrated metal ion species are predominant for n≤4. Clusters larger than this size are more abundant in the hydrogen loss form SrOH+(H2O)n−1. The cluster size at which the product switching occurs is slightly larger (n=5) in the deuterated species. Photodissociation of all clusters results in both ligand loss and H/D atom loss occurring via an intracluster reaction. The monomer and dimer cluster species exhibit distinct absorption bands attributable to electronic excitation of the 5s valence electron of Sr+. Metal–ligand stretching frequencies are extracted from Franck–Condon progressions in the excited state. Spectroscopic parameters agree well with ab initio calculations [Bauschlicher et al., J. Chem. Phys. 96, 4453 (1992), and Sodupe et al., Chem. Phys. Lett. 212, 624 (1993)]. Analysis of the product branching ratios allows us to conclude that, when below the threshold for excited state dissociation, rapid internal conversion followed by an intracluster reaction preferentially occurs on the ground state surface, while evaporation occurs primarily in the excited state. We find evidence in the spectral profiles of clusters with n≥3 for a consistent "substructure" characterized by a pπ state lacking σ-type interactions with the ligand molecules. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480187
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  • 9
    Electronic Resource
    Electronic Resource
    Time-resolved polarization study of anisotropy in bacteriorhodopsin (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 8417-8423 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100385a012
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  • 10
    Electronic Resource
    Electronic Resource
    Vibrational mode-selected differential scattering of NH3+ methanol (d1, d3, d4): Control of product branching by hydrogen-bonded complex formation (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 2395-2407 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report a study of vibrational mode effects and differential scattering in reaction of NH3+ with CD3OD, CD3OH, and CH3OD over the collision energy range from 0.1 to 5 eV. At low collision energies, abstraction of both methyl and hydroxyl D atoms is observed with roughly equal probability, even though methyl D-abstraction should be favored on both energetic and statistical grounds. Branching between the two abstraction reactions is controlled by two different hydrogen-bonded complexes. Formation of these complexes is enhanced by NH3+ umbrella bending, unaffected by the NH3+ symmetric stretch, and inhibited by collision energy. Endoergic proton transfer is mediated at low energies by a third hydrogen-bonded complex, formation of which is enhanced by both umbrella bending and the symmetric stretch. Charge transfer (CT) has a significant cross section only when the NH3+ umbrella bend excitation exceeds the endoergicity. Collision energy and symmetric stretching appear to have no effect on CT. At high collision energies all reactions become direct, with near spectator stripping dynamics. In this energy range product branching appears to be controlled by collision geometry and there are no significant vibrational effects. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475623
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