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  • Artikel: DFG Deutsche Nationallizenzen  (53)
  • 1990-1994  (53)
  • 1
    Digitale Medien
    Digitale Medien
    Cryostat to provide a solid deuterium layer in a plastic shell for the Gekko XII glass laser system (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3378-3383 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A system to provide a liquid or solid deuterium shell target with a plastic ablator for laser implosion experiments was developed. The system is capable of filling a plastic capsule with deuterium gas of 11 MPa at room temperature at the firing position in the target chamber. Then, the target is cooled down to a cryogenic temperature to form a uniform liquid or solid fuel layer inside without exposing it to the atmosphere. Details of the system, tensile strength of polystyrene shells at low temperature, and the residual vapor pressure in the central void of the target at the laser irradiation are described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1142555
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  • 2
    Digitale Medien
    Digitale Medien
    Valence bands of poly(methylmethacrylate) and photoion emission in vacuum ultraviolet region (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5423-5428 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Photoion and photoelectron yields were measured for poly(methylmethacrylate) in the photon energy region of 8–40 eV using synchrotron radiation. Further, the valence-band structure was investigated with ultraviolet photoelectron spectra and valence effective Hamiltonian calculations. A significant difference was observed between the photon energy dependencies of photoion and photoelectron yields. The threshold energy for photoion emission was found to be 10.5 eV, while that for photoelectron emission was 8.5 eV, indicating holes created near the valence-band top do not contribute to the ion emission. At the higher-energy region, the ion emission efficiency was found to be enhanced in the photon energy region of 17–28 eV. The difference between the threshold energies of photoion and photoelectron emission and the enhancement of the photoion emission are discussed in conjunction with the valence-band structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351983
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  • 3
    Digitale Medien
    Digitale Medien
    Time-resolved measurements of laser-induced shock waves in deuterated polystyrene porous targets by x-ray backlighting (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 735-744 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental studies are presented of laser-driven shock waves in deuterated polystyrene porous targets observed with x-ray streak shadowgraphy. Using two different target-mass densities of 0.1 g/cm3 and 0.2 g/cm3, the density dependence of the shock velocity was obtained as vs∝ρ−0.45±0.02 and agreed well with a simple scaling obtained from the Hugoniot relation. X-ray shadowgraphy has shown a shock formation in porous targets and analysis suggests that there are two parts to compression waves: a shock front and a following pileup zone of multiple shock waves. Temporal histories of the pressure, the temperature, and the compression were estimated from the measured shock velocities and the opacities. It was found that the pressure peak due to the shock front was retarded to that by the pileup zone. The pileup zone had a higher compression and followed a thermodynamic condition closer to an adiabat than the shock front.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859869
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  • 4
    Digitale Medien
    Digitale Medien
    Development of x-ray emission computed tomography for ICF research : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2783-2785 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A computed tomographic (CT) technique has been developed to diagnose laser-irradiated spherical targets using x-ray emissions. The three-dimensional (3-D) x-ray distribution was reconstructed by using an algebraic reconstruction technique (ART) from x-ray pinhole camera images obtained along different sight directions. 3-D distributions of electron temperature and density were measured by use of an absorption filter technique. Time-resolved 3-D x-ray emission images from an imploding hollow shell target were reconstructed with less than 100 ps temporal resolution by using x-ray multiframing cameras.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141830
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  • 5
    Digitale Medien
    Digitale Medien
    Giant photoexpansion in As2S3 glass (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2925-2927 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: When illuminated with a focused beam from He-Ne lasers, As2S3 films with thickness of ∼50 μm exhibit the thickness expansion reaching to 3 μm, which is approximately 10 times as great as that expected from the conventional photoexpansion phenomenon. The enhancement seems to be caused by photorelaxation of strain generated by photoexpansion. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112533
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  • 6
    Digitale Medien
    Digitale Medien
    Photoinduced Bragg reflector in As2S3 glass (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1771-1773 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Bragg reflectors have been fabricated in As2S3 glasses through the photoinduced refractive-index change process. Illumination of single monochromatic beams can produce Bragg reflectors with a half Bragg width of 2 nm in wavelength and the reflectivity estimated from the transmission decrease at 10%–20%. The reflectors can be erased with annealing and polychromatic illumination.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.111803
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  • 7
    Digitale Medien
    Digitale Medien
    Observation of cavity effect on spontaneous emission lifetime in AlGaAs quantum microcavities using continuous tuning of emission wavelength (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2944-2946 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Cavity effect on spontaneous emission lifetime has been observed through the continuous tuning of the emission wavelength by quantum confined Stark effect in AlGaAs Fabry–Perot microcavities. The obtained emission wavelength dependence of the exciton lifetime shows that the lifetime increases with the emission wavelength, specifically indicating a sharp increase at the cavity resonant wavelength. This behavior agrees well with the theoretical prediction based on the theoretical model of G. Björk, S. Machida, Y. Yamamoto, and K. Igeta [Phys. Rev. A 44, 669 (1991)]. Furthermore, we have also investigated the emission wavelength dependence of the transfer efficiency and obtained good agreement with the theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.110280
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  • 8
    Digitale Medien
    Digitale Medien
    Residual monomers (TEGDMA and Bis-GMA) of a set visible-light-cured dental composite resin when immersed in water (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 18 (1991), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Rods of a visible-light-cured dental composite resin were photo-polymerized and immersed in water at 37°C for 7 days. The residual monomers (TEGDMA and Bis- GMA) trapped in the set composite and those eluted into water were analysed by gas-liquid chromatography. It became evident that minor amounts of the residual monomers dissolved in water, but that most residual monomers remained in the set composite. Extension of the irradiation period contributed to the significant reduction in the residual monomer level and its elution into water.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2842.1991.tb00067.x
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  • 9
    Digitale Medien
    Digitale Medien
    Presence of C5a-potentiating activity in the plasma of a patient with Kimura's disease (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 49 (1994), S. 0 
    Details
    ISSN: 1398-9995
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: To determine whether the response to the active complement fragment C5a in polymorphonuclear leukocytes (PMN) obtained from a patient with Kimura's disease is similar to that in normal subjects, we evaluated superoxide anion (O2-) generation after stimulation with C5a. The patient's PMN produced more O2- than did those from healthy controls after stimulation with human C5a in vitro. The response returned to normal with the improvement in clinical indicators after initiation of steroid administration. We conducted the following experiments with the plasma of this patient during the active disease stage to establish the presence of a humoral factor that potentiated the C5a-response of PMN. Incubation of PMN from normal controls having the same blood type as the patient at 37°C for 2 h with the patient's plasma at the active disease stage revealed that the cells generated abundant O2- after stimulation with C5a. Incubation of normal PMN with the patient's plasma during the inactive disease stage showed no potentiated response to C5a. This activity was lost after incubation at 56°C for 30 min. Coincubation of PMN with methylprednisolone up to 100 μg/ml did not suppress this activity. Although the plasma concentration of C5a at the active stage was mildly elevated (13 ng/ml), it was below the limit of detection (〈10 ng/ml) at the inactive stage. These results suggest the presence of a heat-labile, humoral factor in the patient's plasma that upregulated the response of PMN to C5a and that was not suppressed by in vitro treatment with a steroid. This factor may influence the acute inflammatory reaction in this disorder.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1398-9995.1994.tb02662.x
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  • 10
    Digitale Medien
    Digitale Medien
    A soft x-ray beam line (BL13C) at the Photon Factory with a CEM using undulator radiation : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1363-1366 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A soft x-ray beam line which enables high resolution and high flux at the same time is being developed at the Photon Factory for advanced characterization of new functional materials. The beam line is designed based on a cylindrical element monochromator (CEM) concept using undulator radiation from a 27-pole multipole wiggler/undulator. The photon energy range of the beam line is 200–1000 eV which covers the core-level excitation energy of carbon, nitrogen, and oxygen. Ray tracing simulation shows that the resolving power (λ/Δλ) is over 12 000 at 30 A(ring) with a throughput of 25% when the opening of the exit slit is 10 μm. The beam line will supply x rays which facilitate both x-ray absorption (XAS) and photoelectron (XPS) spectroscopic measurements with extremely high energy resolution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143071
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