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  • 1
    Electronic Resource
    Electronic Resource
    Vibrational dynamics of the bifluoride ion. I. Construction of a model potential surface (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 466-472 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Construction of an extended model potential surface for the bifluoride ion [FHF−] is described, based on ab initio calculations for the free ion at the CID (configuration interaction, double replacement) level with a Huzinaga–Dunning double-zeta basis set. 710 data points were generated, for displacements in the three noncyclic vibrational coordinates exploring the potential surface to a height at least 30 000 cm−1 above its minimum, and giving a realistic account of the dissociation into HF+F−. Analogous calculations were made for HF and F− using the same basis. The predicted hydrogen bond energy (De) is 48.13 kcal/mol, with equilibrium F–F separation Re =4.2905 a.u., in good agreement with other recent calculations. A model potential has been constructed, based on a superposition of Morse potentials associated with each H–F distance plus a fairly structureless correction function expressible as a 36-term least-squares polynomial in the prolate spheroidal coordinates used to describe vibrational displacements. The resulting model surface fits all 710 ab initio data points with an r.m.s. deviation of 65.6 cm−1, and points less than 15 000 cm−1 above the minimum with a deviation of 26.3 cm−1. This surface provides the basis for a series of vibrational dynamics studies on the FHF− system being done in this laboratory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458449
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  • 2
    Electronic Resource
    Electronic Resource
    Classical and quantum proton vibration in a nonharmonic strongly coupled system (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 4611-4627 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Classical and quantum descriptions of proton vibration are compared for a coupled nonharmonic model based on an ab initio potential for the bifluoride ion, [FHF]−. Accurate quantum calculations and exact classical dynamics are compared with quantum and classical versions of the self-consistent-field (SCF) approximation. Semiclassical and quantum SCF eigenvalues agree within JWKB-type errors. The SCF scheme closely approximates exact quantum states for the lowest 4–5 vibrational levels of each symmetry, except at avoided crossings where strong CI mixing of SCF levels occurs. True classical motion, however, is mainly irregular except at very low energies, and even where it remains regular it may be strongly reorganized by a 1:1 periodic resonance associated with major potential surface features. Strongly mixed CI states at systematic avoided crossings of SCF levels at higher energies do have classical analogs in the reorganized classical motions seen at low energies; stabilized CI components correspond to a stable periodic 1:1 orbit, destabilized components to an unstable periodic 1:1 elliptical orbit. Canonical perturbation theory is used to study further the sense in which the exactly separable classical SCF Hamiltonian is "close'' to the true Hamiltonian. Where true motion is modal or SCF-like, first-order perturbed trajectories and second-order perturbed energies describe it very accurately. However since the dynamics can be strongly disturbed even at very low energies, correlation effects are obviously not "small'' in the sense usually meant in classical dynamics, i.e., that regular trajectories mostly remain regular in the nonseparable perturbed system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466060
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  • 3
    Electronic Resource
    Electronic Resource
    A calibration method of a radio frequency magnetic probe (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3774-3775 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We demonstrate a simple calibration method of a rf magnetic probe by utilizing a two port network analysis method. The sensitivity (V/G) of the probe is determined by measuring the scattering parameters of S11 and S21. The magnetic field generated by the Helmholtz coil is calculated from S11 and the probe sensitivity is obtained from S21. The measured probe sensitivity is 0.1–0.6 V/G in the frequency range of 1–15 MHz. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149951
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  • 4
    Electronic Resource
    Electronic Resource
    Simplified large current crowbar switch using thyristors (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3006-3008 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We demonstrate a large current power crowbar switch using thyristors without complex snubber circuits. Current sharing was obtained by selecting circuit elements for uniform impedance of parallel switches and varistors were used for voltage sharing between series elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144347
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  • 5
    Electronic Resource
    Electronic Resource
    Measurements of the electron temperature by the Thomson scattering system on the Hanbit magnetic mirror device : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1118-1121 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Thomson scattering system on the Hanbit magnetic mirror device has been installed to measure the electron temperature and density of the plasma in the central cell. The configuration is based on a standard 90° scattering scheme. The optical system consists of a Q-switched Nd:YAG laser, input optics, collection optics, spectrograph optics, detectors, and a data acquisition system. Although the laser beam path is about 50 m long and the background emissions are not low, the electron temperature measurements have been made at a single point on a shot-by-shot basis, in which the stray light was considerably suppressed by using a beam dump, a viewing dump, and baffles. The measured electron temperature is about 50–70 eV in experiments for plasma production and heating by ICRF of 200-kW-rf power using a slot antenna. A description of the installed system and the experimental results are presented. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1321749
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  • 6
    Electronic Resource
    Electronic Resource
    A case of Trichosporon cutaneum folliculitis and septicaemia (2003)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 28 (2003), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Trichosporon cutaneum, a saprophytic fungal organism normally found in the soil, has been increasingly recognized as a cause of life-threatening systemic illness in immunosuppressed patients including those with leukaemia. Cutaneous involvement occurs in about 30% of patients with T. cutaneum septicaemia although disseminated folliculitis has not been described to our knowledge. We now describe a case of T. cutaneum follicultis due to fungaemia in a neutropenic patient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2230.2003.01136.x
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  • 7
    Electronic Resource
    Electronic Resource
    Waldenström's macroglobulinaemia presenting as reticulate purpura and bullae in a patient with hepatitis B virus infection (2001)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 26 (2001), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Cutaneous manifestations of Waldenström's macroglobulinaemia (WM) include purpura, ulcers, urticaria, leukocytoclastic vasculitis, and immunobullous dermatoses. No association has been reported previously of WM and hepatitis B virus (HBV) infection. A 40-year-old female HBV carrier was admitted to hospital because of generalized oedema, oliguria, haematuria, hypertension, fever and blood-tinged sputum. Cutaneous manifestations included generalized petechiae, palpable purpura mainly on the legs, multiple necrotic ulcerations and gangrenous changes on the toes, and necrotic, giant confluent reticulate purpura on the trunk surmounted by several tense bullae. Laboratory investigations revealed monoclonal gammopathy of IgM kappa type (6.7 g/L), membranoproliferative glomerulonephritis associated with HBV infection, Bence Jones proteinuria, and an increased number of abnormal plasmacytoid cells in the bone marrow. Pathologic examination demonstrated immune complex-mediated vasculitis with deposits of IgM in the walls of dermal vessels and secondary subepidermal bulla formation. HBV infection may have caused WM or modified the clinical course in this fatal case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2230.2001.00880.x
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  • 8
    Electronic Resource
    Electronic Resource
    Porokeratosis ptychotropica associated with dermal amyloid deposits (2003)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 28 (2003), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2230.2003.01285_4.x
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  • 9
    Electronic Resource
    Electronic Resource
    Two cases of comedonal Darier's disease (2002)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 27 (2002), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2230.2002.01102_1.x
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  • 10
    Electronic Resource
    Electronic Resource
    Widespread skin-limited adult Langerhans cell histiocytosis: Long-term follow-up with good response to interferon alpha (2002)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 27 (2002), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Langerhans cell histiocytosis (LCH) most frequently involves bone, but also involves the skin in 40% of cases; in 10% of patients it is limited to the skin. Cutaneous findings of skin-limited LCH are scaly papules, vesicles, nodules, tumours with erosion, ulceration, or crusting and/or purpura. We report a case of widespread adult-onset LCH confined to skin in which topical carmustine, photochemotherapy, systemic steroids, and 2-chlorodeoxyadenosine were only partially effective. However, longer remission was achieved by the use of subcutaneous interferon-α2b.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2230.2002.00989.x
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