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  • 1
    Digitale Medien
    Digitale Medien
    Control of bleeding in cervical pregnancy: two case reports (1985)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 92 (1985), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1985.tb03039.x
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  • 2
    Digitale Medien
    Digitale Medien
    Plasma catecholamines and modes of delivery: the relation between catecholamine levels and in-vitro platelet aggregation and adrenoreceptor radioligand binding characteristics. (1985)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 92 (1985), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary. Catecholamines were measured in maternal venous, and mixed umbilical cord blood. Maternal catecholamines were significantly (P〈0·01) reduced by epidural analgesia with a 36% reduction in nor-adrenaline and a 33% reduction in adrenaline. Fetal catecholamines were elevated at birth with a 3–8 fold increase in noradrenaline but not adrenaline during spontaneous vaginal delivery. The lowest fetal catecholamines were obtained in the group delivered under epidural analgesia; lower plasma catecholamines were not associated with adverse respiratory effects. Fetal platelets showed impaired a2-adrenoceptor function with absent aggregatory responses to adrenaline in vitro. The defect in platelet function was unlikely to be related to changes in the number of fetal platelet α-receptors or to changes in receptor affinity for adrenaline, as fetal platelets failed to aggregate to adrenaline from deliveries with high and low cord blood catecholamines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1985.tb01397.x
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  • 3
    Digitale Medien
    Digitale Medien
    Influence of the dynamic Stark effect on the small-signal gain of optically pumped 4.3-μm CO2 lasers (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1141-1145 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental results are presented which show that the dynamic Stark effect significantly reduces the small-signal gain (in discharge-excited CO2) and absorption (in unexcited CO2) at the line center of 4.3-μm laser lines directly coupled to 10.4-μm sequence-band pump transitions. In unexcited CO2, population transfer by the pump radiation is negligible and the influence of coherent effects can be observed unambiguously. The results of comparing experiment and theory in this simple case are used to modify a rate-equation model of the 4.3-μm gain dynamics, and the modified calculations are shown to be in good agreement with measured 4.3-μm gain coefficients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336128
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  • 4
    Digitale Medien
    Digitale Medien
    Long-pulse transversely excited 12CO2 and 13CO2 lasers (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 37-42 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A conventional, transversely excited CO2 discharge module is fitted with a pulse-forming network to produce current and laser pulses with a duration of ≥20 μs. Detailed measurements of laser pulse energies and small-signal gain coefficients are made for both 12CO2 and 13CO2 gas mixtures, and the results compared with a computer model. In the long-wavelength band, the two isotopes are found to give very similar performance; the ratio of gain coefficients is measured as 1.00±0.05, while the 12CO2 pulse energy exceeds that of 13CO2 by approximately 20%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343887
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  • 5
    Digitale Medien
    Digitale Medien
    Optimization of pulse energy from 4.3-μm CO2 lasers (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4882-4891 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A detailed study of the output energy characteristics of the pulsed, optically pumped 4.3-μm CO2 laser is described. The predictions of a rate-equation model representing the laser dynamics are shown to be in good agreement with experiment over a wide range of operating conditions. The factors which control the performance of the laser are identified, and the optimum operating conditions for maximum output energy are discussed. Output energies of 15 mJ/pulse and peak powers of 100 kW/pulse have been obtained from an 88-cm-long by 11-cm2-aperture discharge. Scalability of the pulse energy to several hundred mJ using available pump pulse energies is shown to be feasible.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.335310
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  • 6
    Digitale Medien
    Digitale Medien
    Vibrational relaxation of the ν2=1 level of ortho and para NH3 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 5449-5455 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A lead salt diode laser operating in the 12 μm region is used in conjunction with a Q-switched CO2 laser to measure relaxation rates on many different transitions in the ν2 bands of 14NH3 and 15NH3. The measured lifetime of the ν2=1 level is found to differ for ortho and para NH3 transitions. This difference is shown to be caused by a relatively slow (V–V) energy transfer between the ortho and para species. (V–V) and (V–T,R) relaxation rates are reported for NH3–NH3 and NH3–N2 collisions at 200 and 300 K. The rate of vibrational energy transfer between 14NH3 and 15NH3 is also determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.452569
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  • 7
    Digitale Medien
    Digitale Medien
    Vibrational relaxation of the 2ν2 level of NH3 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2892-2899 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Lead salt diode lasers are used in conjuction with a Q-switched CO2 laser to measure collisional energy transfer from the 2ν2 level of NH3. The (V–T,R) relaxation rate from the 2ν2 level is found to be approximately an order of magnitude faster than the comparable relaxation rate from the ν2 level. (V–V) transfer from the ν2 to the 2ν2 levels plays an insignificant role in the dynamics of energy transfer in the ν2 mode of NH3.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455940
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  • 8
    Digitale Medien
    Digitale Medien
    Simple cw NH3 laser operating in the 11–13-μm region (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1413-1416 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A simple and inexpensive method is described for extending the tuning range of a conventional cw CO2 laser into the 11–13-μm region. The technique consists of optically pumping a mixture of NH3 in Ar confined in a capillary waveguide. An output power as high as 1.9 W is attained in the 12-μm region from a pump power of only 8.8 W and a total of 12 laser transitions are observed in 15NH3. The construction of a compact line-tunable laser is described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139423
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  • 9
    Digitale Medien
    Digitale Medien
    Fast optical switching and optical bistability in a PbSnSe étalon (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1215-1217 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the observation of optical bistability with nanosecond optical switching in the lead chalcogenide semiconductor Pb1−xSnxSe. The observed refractive optical nonlinearities were generated by the absorption of radiation from a pulsed CO2 laser at incident intensities of 80 kW cm−2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.98734
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  • 10
    Digitale Medien
    Digitale Medien
    Simple synthetic route to the limonoid system (1987)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 918-919 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00237a058
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