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  • 1
    Electronic Resource
    Electronic Resource
    Development of Steel Plate - Cast Iron Hybrid Casting Process for Recycling of Low Level Radioactive Metal Waste (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 329-330 (Jan. 2000), p. 441-448 
    Details
    ISSN: 1662-9752
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.329-330.441.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    600 V 100 A 4H-SiC Junction Barrier Schottky Diode with Guard Rings Termination (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 556-557 (Sept. 2007), p. 857-860 
    Details
    ISSN: 1662-9752
    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: 4H-SiC SBDs have been commercialized for power application devices. However, themaximum current of these SBDs is 20A. In this work, we designed a JBS (junction barrierSchottky) diode structure and the fabrication processes to be optimized. The current and breakdownvoltage were over 100 A and 660 V at Ir = 1 mA/cm2, respectively. The recovery characteristics ofthe JBS diode are much superior to those of the Si-FRD while it is comparable to those of thecommercially available SiC-SBD at elevated temperatures up to 125°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.556-557.857.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum mechanical study of the light-atom transfer reactions, O(3P)+XCl→OX+Cl (X=H,D). I. Reactions in the ground vibrational states (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6538-6547 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a three-dimensional quantum mechanical study of the light-atom transfer reaction O(3P)+XCl(vi=0)→OX(vf=0)+Cl(X=H,D), where vα represents the vibrational state in the α channel. The adiabatic-bend approximation reformulated in terms of the hyperspherical coordinates is employed to calculate the cross sections and rate constants. The potential energy surface used here is the Persky–Broida's LEPS-I. The results are compared with the available experimental data and quasiclassical trajectory calculations. A discrepancy is found between the present results and the quasiclassical trajectory results at low collision energies (low temperatures). This is a clear manifestation of the quantum mechanical tunneling effect. The present results of the rate constants and the kinetic isotope effect are generally in better agreement with experiment. The previously proposed constant centrifugal potential approximation (CCPA) is directly demonstrated to work well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458289
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical study of associative ionization of hydrogen atoms (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4552-4553 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453765
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  • 5
    Electronic Resource
    Electronic Resource
    A three-dimensional, quantum mechanical study of exchange and charge transfer processes in the (Ar+H2)+ system (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 4651-4664 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A three-dimensional quantum mechanical study of the (Ar+H2)+ system was carried out within the reactive infinite order sudden approximation. All three arrangement channels for exchange and charge transfer were treated simultaneously. Steric factors, opacity functions, angular distributions, and integral cross sections were calculated. Whenever possible, these were compared with both experimental and trajectory surface hopping (TSH) results. Whereas the fit with the TSH results was reasonable, the fit obtained with the experiment was less satisfactory. The reason for that can be attributed at least partially to the semiempirical DIM potential employed in the calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452828
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  • 6
    Electronic Resource
    Electronic Resource
    Separation of collisional and vibrational variables in chemical reactions: Decoupling surface in phase space (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4260-4274 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A method for decoupling the collisional and vibrational variables in the collision process is developed. The present procedure of decoupling is based on a canonical transformation in phase space. The basic principle employed is the "maximal decoupling condition'' [∂H/∂u]u=v=0=[∂H/∂v]u=v=0=0, where H is the Hamiltonian and u and v represent new vibrational coordinates and momenta. "Decoupling surface'' is defined as the surface determined by u=v=0. The partial differential equation to be satisfied by this decoupling surface is derived. This partial differential equation can be solved easily by utilizing classical trajectories. Local vibrational frequencies along the decoupling surface are defined and their stability analysis is shown to provide the criterion for the separability. "Adiabatic approximation'' which assumes the conservation of locally defined actions of the new vibrational variables leads to an "effective Hamiltonian'' that describes the collision process under a given set of the initial vibrational actions. The present theory is applied to the collinear H+H2→H2+H chemical reaction. Analysis of the local frequencies shows that the instability occurs in the following two regions depending on the collision energy: (1) when the collision energy is just above the activation energy, the instability occurs around the saddle point of the potential energy surface and (2) at the higher collision energies, this unstable region disappears, but another one appears in the region where the reactive trajectories touch the ridge of the potential just after passing through the saddle point. In these unstable regions, bifurcation of the trajectories occurs. Analysis of the effective Hamiltonian can indicate the existence of a resonance structure corresponding to a temporal trapping of trajectory. This resonance structure is analogous to that in the coupled-oscillator problems and we can expect that the so-called irregular motion, or a stochastic layer, exists around the separatrix connected to this resonance structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460612
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  • 7
    Electronic Resource
    Electronic Resource
    Theoretical study of the dissociative recombination of NO+ with slow electrons (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6491-6501 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The multichannel quantum defect theory (MQDT) has been applied to the dissociative recombination of NO+ by collisions with slow electrons. The Rydberg states (superexcited states of the second kind) are fully incorporated by using the quantum defect functions. Five valence-type dissociative superexcited states of the first kind (A' 2Σ+, I 2Σ+, B 2Π, L 2Π, B' 2Δ) are all considered as the dissociation channels. Since the recently obtained quite reliable information on the superexcited states is employed in the calculation, the present results are considered to be the most accurate ones at this moment. Energy dependence of the cross sections shows intriguing resonance structures and varies from state to state, reflecting the relative dominance of the three basic important quantities: quantum defect function, electronic coupling, and Franck–Condon factor. The results are compared with other calculations and the available experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458966
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  • 8
    Electronic Resource
    Electronic Resource
    Semiclassical treatment of nonadiabatic transitions: Multilevel curve crossing and nonadiabatic tunneling problems (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 4031-4041 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nonadiabatic transition in a multilevel curve crossing system and the one accompanying quantum mechanical tunneling are investigated theoretically and numerically for the one-dimensional case. The first problem is analyzed using the semiclassical formulation based on the sophisticated two-state theory for nonadiabatic transition. This formulation is applied to three- and four-level model systems and is found to work surprisingly well even when the avoided crossings (or the transition zones) cannot be regarded to be well separated. The significance of the Stokes phase is noticed. As for the second problem, analysis is made not only for the simple tunneling but also for the elastic scattering accompanied by the nonadiabatic tunneling. A combination of the following two formulas is recommended for practical use: (1) the formula essentially based on the one proposed by Coveney et al., and (2) the formula of Ovchinnikova with additional Stokes phase and tunneling corrections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452907
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  • 9
    Electronic Resource
    Electronic Resource
    Dissociative recombination of H+2, HD+, and D+2 by collisions with slow electrons (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 726-737 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using the multichannel quantum defect theory (MQDT), dissociative recombination of H+2, HD+, and D+2 via the two-electron excited superexcited state 1Σg(2pσu)2 is studied for each specified initial vibrational state vi ((approximately-less-than)4) of molecular ions at low electron energies 0.02(approximately-less-than)E(approximately-less-than)1.0 eV. The necessary basic physical quantities, electronic coupling V(R) and quantum defect as a function of internuclear distance R, are obtained from our previous scattering calculations. As a by-product we have also obtained the singlet scattering d-wave partial cross sections for the various vibrational transitions of molecular ions by electron impact. It is found that the Franck–Condon like factor between vibrational state and dissociative continuum is most decisive in characterizing the overall magnitude and energy dependence of the cross sections. Even the vibrational transitions occur predominantly via the dissociative superexcited state. This suggests that the preionization mechanism of the states of the 1Σg symmetry is very different from that of 1Σu and 1Πu in the vicinity of ionization threshold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452275
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  • 10
    Electronic Resource
    Electronic Resource
    Theory of rotational transition in atom–diatom chemical reaction (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 4835-4846 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational transition in atom–diatom chemical reaction is theoretically studied. A new approximate theory (which we call IOS-DW approximation) is proposed on the basis of the physical idea that rotational transition in reaction is induced by the following two different mechanisms: rotationally inelastic half collision in both initial and final arrangement channels, and coordinate transformation in the reaction zone. This theory gives a fairy compact expression for the state-to-state transition probability. Introducing the additional physically reasonable assumption that reaction (particle rearrangement) takes place in a spatially localized region, we have reduced this expression into a simpler analytical form which can explicitly give overall rotational state distribution in reaction. Numerical application was made to the H+H2 reaction and demonstrated its effectiveness for the simplicity. A further simplified most naive approximation, i.e., independent events approximation was also proposed and demonstrated to work well in the test calculation of H+H2. The overall rotational state distribution is expressed simply by a product sum of the transition probabilities for the three consecutive processes in reaction: inelastic transition in the initial half collision, transition due to particle rearrangement, and inelastic transition in the final half collision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456577
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