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  • 1
    Electronic Resource
    Electronic Resource
    Lorazepam premedication for labour (1982)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 89 (1982), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Fifty primigravidae were given either lorazepam (2 mg) or identical dummy tablets in early labour, in a randomized double-blind fashion. Analgesia (standardized at pethidine 100 mg) was given as required, and pain relief was assessed by visual analogue scales. Analgesia was significantly better in those mothers who had received lorazepam. There was a higher incidence of respiratory, depression at birth in the infants in this group, although this was not statistically significant. Patients given lorazepam were all satisfied with their analgesic regimen compared with half of those given an inactive tablet. There was a higher incidence of amnesia for labour in the active group. There is a need for a similar study of the effects of other drugs which arc given to supplement pethidine in labour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1982.tb04683.x
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  • 2
    Electronic Resource
    Electronic Resource
    Degenerative changes and detection of plasminogen in fetal membranes that rupture prematurely (1983)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 90 (1983), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Amniocnonon ootainea at caesarean section ana vaginal delivery, at 34–36 weeks gestation and at term, have been studied by electron microscopy and immunofluorescence for evidence of amniotic epithelial degenerative changes and the presence of plasminogen. When delivery was by caesarean section between 34–36 weeks, electron microscopy revealed no degenerative changes in four cases, but in two cases they were widespread. All but one membrane obtained at term showed only minimal amniotic epithelial cell degenerative changes, but extensive change was seen when delivery was premature after premature membrane rupture. Plasminogen was seen in amniotic epithelium proportional to the degree of cell degeneration; it was absent from healthy membranes. These findings demonstrate that degenerative changes are extensively present in membranes that rupture prematurely, particularly before the onset of premature labour, and suggest a role for plasminogen in membrane rupture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1983.tb09325.x
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  • 3
    Electronic Resource
    Electronic Resource
    Spectroscopic analysis of photoinduced degradation of polyimide for liquid crystal alignment: Linear and nonlinear effects (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 7328-7333 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoinduced liquid crystal alignment is achieved by irradiation of polyimide at 248 nm with polarized excimer laser light below the threshold fluence for significant material removal. The liquid crystal-surface anchoring conditions are found to depend nonlinearly on the incident pulse energy: saturated alignment is achieved with a total incident fluence of only 92 mJ cm−2 when a pulse fluence of 18.4 mJ cm−2 is used, but requires an exposure of 1350 mJ cm−2 for pulses fluences of 2.8 mJ cm−2. Spectroscopic measurements show that the photodegradation mechanism also depends on the pulse energy. When pulses of fluence 0.58 mJ cm−2 are incident, photo-oxidation and deimidization occur and many photoproducts remain on the surface. At higher fluences there is more ablation with material removal from the surface. Saturated alignment is achieved with less photodegradation as well as shorter exposure times when higher pulse energies are used. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1314329
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  • 4
    Electronic Resource
    Electronic Resource
    Pretilted and grating alignment of liquid crystals by oblique ultraviolet irradiation of polyimide (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1752-1756 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We discuss the formation of pretilt by oblique irradiation of photosensitive polymers that homogeneously align liquid crystals in the direction corresponding to the maximum density of unreacted polymer. We show that a tilted polymer distribution is formed by oblique illumination with one beam of unpolarized or partially polarized light. When unpolarized radiation is used, a small azimuthal anisotropy is generated and the polymer tilt angle increases with incident angle. Pretilted liquid crystal alignment is possible up to a threshold angle at which the azimuthal alignment direction changes. Irradiation with partially polarized light gives a higher azimuthal anisotropy but smaller polymer tilt angles. We obtain liquid crystal pretilt angles up to 4° by oblique irradiation of polyimide with light from an excimer laser operating below the threshold for ablation. A simple two step process is used to obtain pretilted alignment for liquid crystals using surface gratings: a grating etched into polyimide by laser ablation is subsequently irradiated at oblique incidence to give planar liquid crystal alignment with a pretilt angle of 3°. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1492863
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  • 5
    Electronic Resource
    Electronic Resource
    Slip at the surface of a translating–rotating sphere bisected by a free surface bounding a semi-infinite viscous fluid: Removal of the contact-line singularity (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 913-924 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A linear slip, Basset-type, boundary condition having an experimentally adjustable phenomenological slip coefficient is used to remove the contact-line singularity that would otherwise prevent the movement of a partially penetrating sphere normal to a planar free surface F bounding a semi-infinite viscous fluid. Stokes flow calculations are presented for the quasistatic hydrodynamic force and torque resistance matrix for a half-submerged sphere that is instantaneously translating and rotating with vector velocities that are arbitrarily oriented relative to the free-surface unit normal vector. The singular components of this material matrix (arising either during translational motion normal to F or rotational motion about an axis lying within F) are shown to be finite for finite slip coefficients β, and to become logarithmically infinite in the traditional nonslip limit β→∞. The relative weakness of this logarithmic singularity suggests that a degree of slip as small as, say, 0.01%—which would presumably be kinematically indistinguishable from the no-slip case—could easily masquerade as a conventional "wall effect'' on the Stokes drag. A small degree of slip is thus hypothesized as a mechanism that would permit the observed transport of Brownian corpuscles across interfacial regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865686
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of exothermic reactions by differential scanning calorimetry (1975)
    s.l. : American Chemical Society
    Analytical chemistry 47 (1975), S. 630-637 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60354a045
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  • 7
    Electronic Resource
    Electronic Resource
    Saturation of the nonlinear refractive-index change in a semiconductor-doped glass channel waveguide (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 481-483 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The saturated nonlinear refractive-index change in a CdSxSe1−x semiconductor-doped glass channel waveguide was measured with a picosecond pump-probe Mach–Zehnder interferometer at photon energies below the band gap. The pump-probe configuration permitted the resolution of competing thermal and electronic nonlinearities. The significance of the results for all-optical switching is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101361
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  • 8
    Electronic Resource
    Electronic Resource
    Spectroscopic evidence for different laser gain mechanisms in optically pumped ZnCdS/ZnS quantum well structures (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 5621-5625 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The role of biexcitons has been studied in two optically pumped quantum well (QW) structures of Zn1−xCdxS/ZnS, one with 18% Cd concentration and the other with 3% in the wells. For the x=18% QW structure, high excitation photoluminescence and stimulated emission indicate that the laser gain mechanism involves biexcitons. For the x=3% QWs, even though biexcitons are clearly observed in the spontaneous emission, they are not responsible for laser gain in this structure. Instead exciton–exciton scattering may be the more likely mechanism responsible for laser gain close to threshold, while at higher densities an estimate of the carrier density indicates an electron–hole plasma as the likely source of optical gain. The different mechanisms in the two cases can, very likely, be attributed to one of differing degrees of localization both within the QW and at alloy fluctuations. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368609
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  • 9
    Electronic Resource
    Electronic Resource
    Anderson localization and Monte Carlo simulation of vertical transport in disordered finite superlattices (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4378-4383 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects on the carrier wave functions of introducing monolayer disorder at the heterojunction interfaces of an undoped superlattice are elucidated. In particular the rate and extent of the resulting localization is quantified by means of an entity C, which is the joint probability of finding two carriers in the same region of space. Evaluating the latter for all states in the miniband provides clear evidence for the existence of a mobility edge in finite two-dimensional structures. Using the entity C as the basis for a semiclassical evaluation of carrier transport, it is shown that the experimentally observed activated transport can be accounted for in terms of the excitation of carriers from the localized states at the bottom of the miniband into the more extended midband miniband states. Comparison of the theoretical results with the experimental results given [Chen et al., J. Cryst. Growth 159, 1066 (1996)], enables conclusions to be drawn concerning the mechanism of activated carrier transport in doped superlattice systems. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366248
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  • 10
    Electronic Resource
    Electronic Resource
    High-power tunable operation of AlGaAs/GaAs quantum well lasers in an external grating cavity (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1140-1142 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data are presented on operation of 100 μm aperture gain-guided single quantum well laser diodes in an external grating cavity. A maximum power of 550 mW is coupled out of the cavity with an efficiency of 0.51 W/A. The laser emission has a linewidth of (approximately-less-than)1 A(ring) and is tunable from 7950 to 8450 A(ring) for the specific laser diodes used in this study. The output beam is collimated in the direction perpendicular to the p-n junction, and exhibits a divergence of 0.4° parallel to the p-n junction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104396
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