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  • 1
    Electronic Resource
    Electronic Resource
    Electrochemical reduction of 2-(arylideneamino)furans: an unexpected stable anion-radical (1992)
    s.l. : American Chemical Society
    The @journal of organic chemistry 57 (1992), S. 4287-4289 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00041a041
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  • 2
    Electronic Resource
    Electronic Resource
    The systematic uncertainty in the calibration of the Langavant calorimeter (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 2795-2800 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A mathematical study is made of the systematic uncertainty in the Langavant calorimeter calibration, determining the most influent variables being able to optimize the method. The influence of calibration constants on the determination of the heat of hydration of a cement is analyzed. Accuracy modification of several measuring instruments is suggested and imprecisions correction in the UNE 80-118-86 Spanish Standard and in the NF P 15-436-88 French Standard are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142215
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  • 3
    Electronic Resource
    Electronic Resource
    Possibility of multiple tunnelling current peaks in a coupled quantum well system (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 943-947 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work, we have numerically integrated in space and time the effective-mass nonlinear Schrödinger equation for an electron wave packet in a bilayer electron system. Considering both Hartree and exchange-correlation potentials, we have calculated the tunnelling rates between the two quantum wells when an external bias is applied in the double quantum well system. Due to the nonlinear effective-mass equation, it is found that the charge dynamically trapped in both wells produces a reaction field which modifies the system resonant condition. At different electronic sheet densities, we have shown the possibility of having multiple resonant tunnelling peaks in a bilayer electron system. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373760
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  • 4
    Electronic Resource
    Electronic Resource
    Guinea Pig Histamine H1 Receptor. I. Gene Cloning, Characterization, and Tissue Expression Revealed by In Situ Hybridization (1994)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 62 (1994), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: An intronless DNA encoding the guinea pig H1 receptor was cloned from a genomic library using probes derived from the bovine H1 receptor. It encodes a protein of 488 amino acids with a calculated molecular mass of 55,619 daltons compared with a size of 56–68 kDa for the photoaffinity-labeled receptor as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis. The protein displays a 66% homology with the bovine receptor. Stable expression of the H1 receptor, characterized by the appearance of [3H]mepyramine binding sites with a pharmacology similar to that of the native H1 receptor, was obtained following transfection of Chinese hamster ovary cells. Southern blot analysis, using a variety of restriction enzymes, did not provide any evidence of multiple H1 isoreceptors. Northern blot analysis of a variety of guinea pig peripheral or cerebral tissues identified, in most cases, a single transcript of 3.3 kb, but also, in some tissues, a second transcript of 3.7 kb, possibly generated by the use of different promoter or polyadenylation sites or corresponding to a transcript from a distinct gene. In situ hybridization studies showed the highly contrasted cerebral expression of H1-receptor gene transcripts, which was compared with autoradiographic receptor localization. This allowed the identification of some major cell populations expressing the H1 receptor, e.g., Purkinje cells in cerebellum or pyramidal cells in the hippocampal complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1994.62020507.x
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  • 5
    Electronic Resource
    Electronic Resource
    Efficiency of photoluminescence and excess carrier confinement in InGaAsP/GaAs structures prepared by metal-organic chemical-vapor deposition (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 700-704 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Special double- and separate-confinement InGaAsP/GaAs heterostructures intended for photoluminescence measurements have been grown by low-pressure metal-organic chemical-vapor deposition. The band gap of the active region quaternary material was close to 1.5 eV, and the waveguide of the separate-confinement structures was near 1.8 eV. Measurement of the integrated luminescence efficiency at 300 K has shown that over a wide range of excitation level (10–103 W/cm2) radiative transitions are the dominant mechanism for excess carrier recombination in the active region of the structures studied. As determined by spectral measurements, the excess carrier concentration in the waveguide of the separate-confinement heterostructures and the intensity of the waveguide emission band correspond to a condition of thermal equilibrium of the excess carrier populations in the active region and the waveguide. The ratio of the intensity of the waveguide emission to the active region emission fits a model which assumes that the barrier height for minority carriers (holes) is equal to the difference in band gaps between the active region and the waveguide region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358519
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  • 6
    Electronic Resource
    Electronic Resource
    High-power InGaAsP/GaAs 0.8-μm laser diodes and peculiarities of operational characteristics (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1004-1005 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-power operation of 3 W in pulse mode, 750 mW in quasi-continuous wave and 650 mW in continuous wave per uncoated facet from 100-μm aperture has been demonstrated for 1-mm-long cavity InGaAsP/GaAs 808-nm laser diodes prepared by low-pressure metalorganic chemical vapor deposition. Threshold current density of 300 A/cm2, differential efficiency of 1.1 W/A, T0=155 °C, transverse beam divergence of 27°, and less than 2-nm linewidth at 808 nm have been measured. No degradation has been observed after 1000 h of operation in a quasi-continuous wave regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112206
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  • 7
    Electronic Resource
    Electronic Resource
    Theoretical investigation of minority carrier leakages of high-power 0.8 μm InGaAsP/InGaP/GaAs laser diodes (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2260-2262 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a theoretical model that accurately describes the effects of minority carrier leakage from the InGaAsP waveguide into InGaP cladding layers in high-power aluminum-free 0.8 μm InGaAsP/InGaP/GaAs separate confinement heterostructure lasers. Current leakage due to the relatively low band-gap discontinuity between the active region and the InGaP barrier can be eliminated by employing laser diodes with cavity length longer than 500 μm. Experimental results for lasers grown by low-pressure metalorganic chemical vapor deposition are in excellent agreement with the theoretical model. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112738
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  • 8
    Electronic Resource
    Electronic Resource
    Low-threshold and high power λ∼9.0 μm quantum cascade lasers operating at room temperature (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1741-1743 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a low threshold current density and high power for λ∼9 μmAlInAs/GaInAs quantum cascade lasers operating at room temperature. The threshold current density is 1.95 kA/cm2 at 300 K and 0.61 kA/cm2 at 80 K for 5 μs pulses at 200 Hz repetition rate. The peak output power is 700 mW at room temperature and 1.3 W at 80 K per two facets for cavity length is 3 mm with a stripe width of 20 μm. The characteristic temperature T0 is 185 °C. The slope efficiency is 450 and 800 mW/A at 300 and 80 K, respectively. In continuous wave operation, the output power is more than 150 mW at 80 K and 25 mW at 140 K. This high performance was achieved by improving the material growth and processing technology. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310632
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  • 9
    Electronic Resource
    Electronic Resource
    High-performance quantum cascade lasers (λ∼11 μm) operating at high temperature (T ≥425 K) (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 416-418 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report record-low threshold current density and high output power for λ∼11 μm Al0.48In0.52As/Ga0.47In0.53As quantum cascade lasers operating up to 425 K. The threshold current density is 1.1, 3.83, and 7.08 kA/cm2 at 80, 300, and 425 K, respectively, for 5 μs pulses at a 200 Hz repetition rate. The cavity length is 3 mm with a stripe width of 20 μm. The maximum peak output power per facet is 1 W at 80 K, 0.5 W at 300 K, and more than 75 mW at 425 K. The characteristic temperature of these lasers is 174 K between 80 and 300 K and 218 K in the range of 300–425 K. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343848
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  • 10
    Electronic Resource
    Electronic Resource
    Can esmolol manage surgically-induced tachycardia? (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 46 (1991), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A double-blind, randomised study was conducted to examine the efficacy of a single bolus dose of esmolol in treating surgically-induced tachycardia. Anaesthetic technique was identical in all patients, and consisted of premedication with midazolam and glycopyrronium, induction with thiopentone followed by suxamethonium, tracheal intubation, and maintenance with isoflurane 0.6% (end-tidal) and60% nitrous oxide in oxygen. Forty-eight patients developed a heart rate of greater than 95 beats/minute or 20% more than pre-induction values at an average time of 34 minutes after tracheal intubation and received placebo (15 patients), esmolol 50 mg (16 patients), or esmolol 100 mg (17 patients). Controlled intervention was instituted if heart rate or blood pressure was not adequate. Both 50 and 100 mg of esmolol resulted in lower heart rates compared to placebo (p 〈 0.05), with no difference between the two esmolol groups (p 〉 0.05). Patients who received placebo had more episodes of medical intervention than those given esmolol (p 〈 0.05). No adverse effects occurred in any patient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1991.tb09414.x
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