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  • Electronic Resource  (6)
  • 1995-1999  (6)
  • 1980-1984
  • 1998  (6)
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  • Electronic Resource  (6)
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  • 1995-1999  (6)
  • 1980-1984
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  • 1
    Electronic Resource
    Electronic Resource
    Initial vibrational level distribution of HCN[X˜ 1Σ+(v10v3)] from the CN(X 2Σ+)+H2→HCN+H reaction (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 4224-4236 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of the cyano radical (CN) with hydrogen was studied by time-resolved infrared absorption spectroscopy of individual rovibrational states of HCN. The initial vibrational level distribution of HCN(v10v3) was determined by plotting the time dependence of the fractional population of a vibrational level and extrapolating these curves to the origin of time. The experiments were carried out at two temperatures, 293 and 324 K, with similar results. It was estimated that about 50% of the available reaction exothermicity was deposited as vibrational excitation of the HCN product. Surprisingly, the HCN(101) vibrational level received a significant fraction of the observed vibrational population, implying that the CN vibration was not really a spectator bond in the reaction dynamics. Furthermore, the observed HCN(v10v3) vibrations only account for about 27% of the initial HCN population produced in the title reaction. A significant fraction of the product HCN molecules must have been produced with the bending mode excited, likely in combination with the H–C stretch vibrations. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477028
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental measurement of the transition moment for the (2,0) band of the CN A 2Π←X 2Σ+ red system at 789.5 nm (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 6312-6319 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The square of the electronic–vibrational transition moment for the (2,0) band of the cyano radical (CN), A 2Π←X 2Σ+, red system at 789.5 nm has been determined using a direct time-resolved absorption technique. The line strength of the R1(8.5) transition of 12C14N was measured by comparison to the known line strength of the H12C14N(001)←(000) P(8) infrared υ3 fundamental transition near 3.05 μm. The CN radical was created by pulsed-laser photolysis of cyanogen, (CN)2, in a mixture of H2 and (CN)2 in either Ar or He carrier gas at 293 K. Both CN and HCN were monitored by time-resolved absorption spectroscopy during the same photolysis laser pulse. A simple kinetic model was used to relate the two absorption features to each other. The square of the electronic–vibrational transition moment for the A←X(2,0) band was found to be 7.8±1.0×10−38 esu2 cm2 in good agreement with theoretical calculations based on ab initio quantum chemistry methods. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477273
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Large (50 μm)2 metal–semiconductor–metal photodetectors with 18 GHz bandwidth at 3 V bias; Reduction of hole pileup (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 196-198 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Metal–semiconductor–metal photodetectors were fabricated on an AlGaAs/GaAs/AlGaAs double heterostructure with no graded layers. Devices with photolithographically defined finger spacing and width of 1 μm ("1×1") exhibited a saturation bandwidth of greater than 20 GHz, for bias voltages between 3 and 4 V. We attribute this to minimal hole pileup, and propose a simple model for the energy of hot holes near the band offset at the cathode. Using this model, estimates of the bias required to reduce hole pileup in different material systems were derived. The model shows good agreement with results reported here and elsewhere. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121753
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  • 4
    Electronic Resource
    Electronic Resource
    SHO training in anaesthetics. How good is it? (1998)
    Oxford : Blackwell Science Ltd, UK
    Anaesthesia 53 (1998), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: All senior house officer posts in the Yorkshire Deanery have been assessed against five parameters. Posts in anaesthesia were among the best with excellent consultant support, good exposure to clinical practice and well-structured education and training. Anaesthetic posts were almost unique in satisfying the ‘New Deal’ on junior doctors hours though intensity of work was something of a problem for the on-call senior house officer. Appraisal is a new educational tool which is being used to a greater degree in anaesthetics than in any other specialty. The deficiencies found in anaesthetic posts could be corrected by the universal use of appraisal and solving the recruitment problems that have compromised the delivery of good training in some districts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1998.00245.x
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  • 5
    Electronic Resource
    Electronic Resource
    Production of insulin-like growth factor I (IGF-I) and IGF-binding proteins by rat intestinal stromal cells in vitro (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 158-166 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Insulin-like growth factors; IGFs; IGFBP; stroma; epithelium; stromal-epithelial interactions.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. To determine if intestinal stromal cells secrete diffusible factors such as insulin-like growth factors (IGFs) capable of regulating epithelial cell growth in vitro, stromal cells were isolated by enzymatic digestion of rat intestine. Incorporation of [3H]thymidine into DNA and [14C]leucine into protein of IEC-6 cells, a model intestinal epithelial cell line, was significantly increased (two- to threefold) when the IEC-6 cells were co-cultured with stromal cells, relative to IEC-6 cells grown alone. Medium conditioned by stromal cells stimulated DNA synthesis of IEC-6 cells in a dose-dependent manner. Analysis of the conditioned medium revealed that intestinal stromal cells secreted IGF-I, but little IGF-II, in addition to an M r 32,000 IGF-binding protein (IGFBP-2) and an IGFBP having M r∼ 24,000. We conclude that rat intestinal stromal cells secrete one or more diffusible factors, which may include IGF-I and IGFBPs, capable of stimulating proliferation of IEC-6 cells in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050137
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  • 6
    Electronic Resource
    Electronic Resource
    Acentric cubic NaClO3– a new crystal for Raman lasers (1998)
    Springer
    Applied physics 67 (1998), S. 157-162 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65 Dr; 42.70 Nq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 3 crystal were investigated. At room temperature under picosecond excitation efficient high-order stimulated Raman scattering in the visible and near-IR regions was observed. A total conversion efficiency of the 1-μm Nd3+:Y3Al5O12 laser-pump emission to Stokes and anti-Stokes lines of about 70% was estimated. All registered scattered laser components were identified. We classify the NaClO3 single crystal as a promising χ(3) medium for Raman lasers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050487
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