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  • 1
    Electronic Resource
    Electronic Resource
    An intramolecular Diels-Alder reaction of vinylsilanes (1992)
    s.l. : American Chemical Society
    The @journal of organic chemistry 57 (1992), S. 5279-5281 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00046a002
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  • 2
    Electronic Resource
    Electronic Resource
    Divergent reaction pathways between rhodium(II)-stabilized vinylcarbenoids and benzenes (1992)
    s.l. : American Chemical Society
    The @journal of organic chemistry 57 (1992), S. 6900-6903 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00051a041
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  • 3
    Electronic Resource
    Electronic Resource
    Structural and orientational relaxation in supercooled liquid triphenylphosphite (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 5448-5459 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Structural and orientational relaxation processes in the glass-forming liquid triphenylphosphite (TPP) were studied by impulsive stimulated scattering, a time-resolved four-wave mixing technique. The α structural relaxation processes which can couple to the longitudinal and shear acoustic modes are analyzed phenomenologically in terms of a distribution of relaxation times fL(τL,T) or fS(τS,T), respectively, in the temperature range of 270–240 K. The two distributions appear to be identical, and undergo marked broadening as the sample is cooled. They are best described by a stretched exponential relaxation function whose exponent decreases with temperature. The molecular orientational relaxation times τor follow an Arrhenius temperature dependence and are longer than the average relaxation times 〈τL〉 and 〈τS〉 at high temperature, but converge as the temperature is lowered. We conclude that the observed orientational relaxation is decoupled from the α structural relaxation process and is a manifestation of the β orientational relaxation process. The low frequency intramolecular mode observed in the experiment was found to be essentially independent of temperature. A picture of structural and orientational relaxation processes in supercooled TPP consistent with recent theories of structural relaxation processes in supercooled liquids is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462728
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  • 4
    Electronic Resource
    Electronic Resource
    Quantum mechanical reaction probabilities with a power series Green's function (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 6917-6928 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a new method to compute the energy Green's function with absorbing boundary conditions for use in the calculation of quantum mechanical reaction probabilities. This is an iterative technique to compute the inverse of a complex matrix which is based on Fourier transforming time-dependent dynamics. The Hamiltonian is evaluated in a sinc-function based discrete variable representation, which we argue may often be superior to the fast Fourier transform method for reactive scattering. We apply the resulting power series Green's function to the calculation of the cumulative reaction probability for the benchmark collinear H+H2 system over the energy range 0.37–1.27 eV. The convergence of the power series is found to be stable at all energies and accelerated by the use of a stronger absorbing potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464759
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  • 5
    Electronic Resource
    Electronic Resource
    Emission spectroscopy of nitrogen in a supersonic discharge. Evidence of excited neutral nitrogen clusters (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2564-2567 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Emission spectra indicating transient clusters in a supersonic nitrogen discharge are presented. Select spectral bands are attributed to emission from N2(C 3Πu,v'=0,1)–N2(X 1Σg+). The cluster transitions manifest as blue-degraded, blue-shifted sidebands of the second positive group due to emission from N2(C 3Πu). Results and significance concerning these previously undiscovered nitrogen clusters are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465073
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  • 6
    Electronic Resource
    Electronic Resource
    Use of Venous Fistula Technique for Intraoperative Cardiac Hemorrhage (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 8 (1993), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract We describe an innovative technique to control hemorrhage after right atrial wall reconstruction in a patient with primary angiosarcoma. At the time of surgery, the tumor was found to involve all of the free wall of the right atrium and a superficial layer of the right ventricle. A pericardial patch was used to reconstruct the right atrial wall; however, there was diffuse coagulopathy with bleeding from the anastomoses and remaining tumor. To tam-ponade the bleeding, a Dacron patch was sewn to the right edge of the pericardium, around the right ventricle and right coronary artery, but with little improvement in the bleeding. A type of Cabrol fistula was then formed with a tube graft from the Dacron patch to the left innominate vein. This acted as a conduit back into the venous system, with the blood taking the path of least resistance. Hemostasis was then achieved, allowing the patient to be taken to the intensive care unit. (J Card Surg 1993; 8:558–561)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1993.tb00413.x
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of oxygen on the thermal stability of Si1−xGex strained layers (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1536-1538 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal stability of Si1−xGex strained layers containing 2×1020 oxygen atoms/cm3 is compared with that of similar layers (same Ge fraction and film thickness) containing more than two orders of magnitude less oxygen. For the layers with high oxygen levels, no misfit dislocations were found in films as thick as two times the theoretical equilibrium critical thickness, after annealing at 850 °C for 4 min. In contrast, dislocations were found in the layers with low oxygen levels at thicknesses very near the equilibrium critical thickness after the same anneal. X-ray measurements of lattice constants in high and low oxygen films of similar Ge content indicate that oxygen does not substantially change the amount of strain in the layers. Oxygen appears to impede the kinetics of dislocation formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105170
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  • 8
    Electronic Resource
    Electronic Resource
    Microsecond rotational dynamics of spin-labeled calcium-ATPase during enzymic cycling initiated by photolysis of caged ATP (1991)
    s.l. : American Chemical Society
    Biochemistry 30 (1991), S. 8331-8339 
    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/bi00098a008
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  • 9
    Electronic Resource
    Electronic Resource
    Reduction in misfit dislocation density by the selective growth of Si1−xGex/Si in small areas (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 51-53 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Si1−xGex and Si layers have been grown selectively in the exposed Si regions on oxide-patterned 〈100〉 oriented Si wafers using the chemical vapor deposition technique limited reaction processing. Misfit dislocation spacings at the heterointerface were measured using plan-view transmission electron microscopy in conjunction with a large-area thinning technique which allows for examination of 100–150 μm diameter areas. The dislocation density is reduced by at least a factor of 20 for small areas (lateral dimensions: tens of microns) bounded by oxide isolation when compared to adjacent large areas (millimeters) which are uninterrupted by the patterned oxide. The ability to selectively grow Si1−xGex on patterned wafers and the area-dependent reduction in dislocation density in as-grown films may be important considerations for future device applications using Si1−xGex strained layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103176
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  • 10
    Electronic Resource
    Electronic Resource
    Time resolved mass flow measurements for a fast gas delivery system (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1740-1743 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique is demonstrated whereby the delivered mass and flow rate versus time of a short rise-time gas delivery system may be accurately determined. The gas mass M that flows past a point in a gas delivery system by an arbitrary time t=tp may be accurately measured if that point is sealed off with a fast closing valve within a time interval short compared to the mass flow time scale. If the injected mass is allowed to equilibrate in a known volume after being cut off from its source, a conventional static pressure measurement before and after injection, and application of the ideal gas law suffices. Repeating for many different values of tp, and assuming reproducibility, the injected mass time history M(t) characteristic of the system without the fast closing valve may be determined. The flow rate versus time dM(t)/dt may then be determined by numerical differentiation. Mass flow measurements are presented for a fast delivery system for which the flow of argon through a 3.2-mm-i.d., 0.76-mm-thick copper tube is isolated by imploding (θ pinching) the tube using a single turn tungsten magnetic-field coil. Optical measurements of the tube's internal area versus time indicate that the tube is sealed in 7 μs. Results are correlated with piezoelectric probe measurements of the gas flow and 2D axisymmetric numerical simulations of the θ pinch process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144002
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