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  • 1
    Digitale Medien
    Digitale Medien
    Study of indirectly driven implosion by x-ray spectroscopic measurements (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 2063-2074 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Fusion pellet implosion by laser-generated x rays was investigated by means of time-integrated spectroscopic measurements. Deuterium fuel was seeded with a small amount of Ar in order to determine the electron temperature and the density of the compressed fuel from, respectively, the emission intensity ratio and the broadening of the Lyβ (Ar17+1s-3p) and Heβ (Ar16+1s2-1s3p) lines. Comparison of the observed results with volume-averaged temperatures and densities obtained from one-dimensional (1-D) fluid-dynamic simulations showed large discrepancies at maximum compression. One possible explanation is that the fuel is stably compressed until the beginning of pusher deceleration by collision with a reflected shock wave from the pellet center, and that further compression during the deceleration phase is terminated in particular for heavy stagnation cases. Similar results were obtained for fusion output. Experimentally obtained neutron yields were close to those from the 1-D simulations at the beginning of the deceleration but a factor of 10–100 less than those expected at maximum compression. These results were examined in terms of shell disintegration in the acceleration phase and pusher–fuel mixing at the contact surface in the deceleration phase due to growth of initial perturbations of the pellet resulting from fluid instabilities. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871293
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  • 2
    Digitale Medien
    Digitale Medien
    Orientation-dependent Ga surface diffusion in molecular beam epitaxy of GaAs on GaAs patterned substrates (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7273-7281 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Generation of extra facets on ridge-type triangles with (001)-, (110)-, and (201)-related equivalent slopes on GaAs (111) A substrates and stripes running in the [1¯10], [110], and [100] directions on (001) substrates during molecular beam epitaxy of GaAs/AlGaAs multilayers was investigated. By investigating local variation in layer thickness in the regions adjacent to extra (114)A, (110), and (1¯1¯1¯)B facets common to the (111)A and (001) patterned substrates and extra facets specific to the respective substrates and growth rates of the facets relative to the growth rate on the substrate plane, the orientation-dependent Ga surface diffusion length, λGa, was elucidated as λGa(001)(approximate)λGa(1¯1¯3¯)B〈{λGa(1¯1¯1 ¯)B,λGa(3¯3¯1¯)B,λGa(013),λGa(113)A}〈λGa(159)(approximate)λGa(114)A(approximate)λGa(111)A〈λGa(110). That is, λGa increases in the order of the (001), (1¯1¯1¯)B-related, (111)A-related, and (110) surfaces.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365548
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  • 3
    Digitale Medien
    Digitale Medien
    Erratum: "Orientation-dependent Ga surface diffusion in molecular beam epitaxy of GaAs on GaAs patterned substrates" [J. Appl. Phys. 81, 7273 (1997)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4698-4698 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.366553
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  • 4
    Digitale Medien
    Digitale Medien
    Temperature mapping of compressed fusion pellets obtained by monochromatic imaging : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 734-736 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We report the first use of toroidally bent crystals to record two-dimensional, spatially resolved, monochromatic images of laser-produced fusion plasma. The electron temperature was determined by seeding the deuterium fuel with argon and evaluating the intensity ratio of the two monochromatic images in the Ar+ 17Ly β and the Ar+ 16He β lines. Silicon and germanium crystals were chosen to achieve high diffraction reflectivities. Spatial resolution better than 10 μm was achieved by bending the crystals toroidally to minimize the geometrical aberrations [E. Förster, K. Gäbel, and I. Uschmann, Laser Particle Beams 9, 135 (1991)]. Comparison of the two line intensities requires a calibrated imaging system. Monochromatic images of fusion pellets driven with the GEKKO XII glass laser system are presented. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146273
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  • 5
    Digitale Medien
    Digitale Medien
    Stripe patterns formed by the thermal desorption of Ga atoms on Ga-terminated Si(111) surfaces (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 631-633 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The Si(111)-7×7 area surrounded by the Si(111)-(square root of)3×(square root of)3R30°-Ga region has been observed by scanning tunneling microscopy during the thermal desorption of Ga atoms at ∼600 °C and after the desorption. The 7×7 area exhibits triangular and strip patterns on the nanometer scale for the Si(111) substrates tilting toward the [112¯] and [1¯1¯2] directions, respectively. This is because faulted halves of the 7×7 reconstruction are adjacent to the (square root of)3×(square root of)3-Ga area on the boundary between the 7×7 and (square root of)3×(square root of)3-Ga areas during Ga desorption. It has been found that strip patterns with nanometer-scale precision are formed on the Si(111) substrates tilting toward the [1¯1¯2] direction. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116491
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  • 6
    Digitale Medien
    Digitale Medien
    Temperature and polarization dependence of LiNbO3 quasiphase-matched wavelength converters (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1933-1935 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Temperature and polarization characteristics of 1.55-μm-band LiNbO3 quasiphase-matched (QPM) wavelength converters have been studied by second-harmonic generation (SHG). It is found that the shift of the QPM wavelength is linearly proportional to temperature over the measured temperature range between 10 and 40 °C, with a temperature tolerance (corresponding to a 3 dB reduction in the QPM conversion efficiency) of greater than 10 °C for a 10-mm-long device. With respect to the angle θ of the injected fundamental light polarization direction, the SHG power changes as a function of sin4 θ, with a tolerance of over 60°. Theoretical explanations for the observed results are also presented. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.123732
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  • 7
    Digitale Medien
    Digitale Medien
    More than a 600-fold variation in nitrogen dioxide assimilation among 217 plant taxa (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 21 (1998), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Assimilation of nitrogen dioxide in response to fumigation with 15N-labelled nitrogen dioxide was studied in 217 plant taxa. The taxa included 50 wild herbaceous plants collected from roadsides (42 genera, 15 families), 60 cultivated herbaceous plants (55 genera, 30 families) and 107 cultivated woody plants (74 genera, 45 families). Two parameters, the ‘NO2-N content’, or NO2-derived reduced nitrogen content in fumigated plant leaves (mg N g–1 dry weight), and the ‘NO2-utilization index’, or percentage of the NO2-derived reduced nitrogen in the total reduced nitrogen, were determined. The NO2-N content differed 657-fold between the highest (Eucalyptus viminalis; 6·57) and lowest (Tillandsia ionantha and T. caput-medusae; 0·01) values in the 217 taxa; 62-fold in a family (Theaceae) and 26-fold in a species (Solidago altissima). Nine species had NO2-utilization indices greater than 10%, of which Magnolia kobus, Eucalyptus viminalis, Populus nigra, Nicotiana tabacum and Erechtites hieracifolia had NO2-N contents 〉 4·9. These plants can be considered ‘NO2-philic’ because in them NO2-nitrogen has an important function(s). The Compositae and Myrtaceae had high values for both parameters, whereas the monocots and gymnosperms had low ones. These findings suggest that the metabolic pathway of NO2-nitrogen differs among plant species. The information presented here will be useful for creating a novel vegetation technology to reduce the atmospheric concentration of nitrogen dioxide.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-3040.1998.00255.x
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  • 8
    Digitale Medien
    Digitale Medien
    Plasma volume estimation using indocyanine green with biexponential regression analysis of the decay curves (1997)
    Oxford, UK : Blackwell Science Ltd
    Anaesthesia 52 (1997), S. 0 
    Details
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: We studied seven analytical methods of estimating the plasma volume from the decay curves of indocyanine green. Fifteen volunteers received 1.0 mgkg−1 of the dye by intravenous injection and the plasma concentration was measured continuously using spectrophotometry. Plasma volumes were calculated using three single-regression methods (1-a, 1-b, 1-c) and four biexponential regression methods (2-a, 2-b, 2-c, 2-d). The means (SD) of 1-a, 1-b and 1-c were 39 (5.0), 44 (5.7) and 54 (11.5) mlkg−1, respectively, and these were significantly different from each other (p 〈 0.05). The values for methods 2-b, 2-c and 2-d were similar to each other: 39 (4.6), 40 (4.1) and 40 (4.0) mlkg−1, respectively. These required more than 3 min circulation or mixing time. When the time allowed for mixing was less than 3 min (method 2-a) the plasma volume was underestimated. We conclude that plasma volume estimation using indocyanine green and spectrophotometry is most accurate when the mixing time is adequate (3–5 min) and the decay curves are analysed using biexponential regression.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2044.1997.249-az0389.x
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  • 9
    Digitale Medien
    Digitale Medien
    A decade-long sour-taste sensation successfully treated with a proton-pump inhibitor (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 32 (2005), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: summary We report a case study of a 54-year-old Japanese woman who persistently suffered from a sour-taste sensation in her mouth for 10 years, and was treated with a proton-pump inhibitor (PPI). She found sour-tasting meals irritable, and after eating such meals the sour-taste sensation worsened. She also complained of eructation and regurgitation. Upper gastrointestinal (GI) endoscopy showed duodenal erosion, superficial gastritis, and erosive oesophagitis. After 2 weeks of PPI therapy (lansoprazole, 30 mg day−1) the sour taste subjectively decreased to 70%, and after 6 weeks the symptoms disappeared. In addition to increased sensitivity of the mouth, gastro-oesophageal reflux might have created her obstinate sour-taste sensations. It is suggested that in such cases PPI therapy should be attempted.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2842.2005.01492.x
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  • 10
    Digitale Medien
    Digitale Medien
    Speech intelligibility following maxillectomy with and without a prosthesis: an analysis of 54 cases (1998)
    Oxford, UK : Blackwell Science, Ltd
    Journal of oral rehabilitation 25 (1998), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: To statistically evaluate the factors that influenced speech following maxillectomy, the speech intelligibility (SI) in 54 patients was measured with and without a prosthesis. The mean SI score without a prosthesis in all patients was 35.7 ± 22.7% and that with a prosthesis was 84.9 ± 12.7%. The results of the postmaxillectomy SI statistical analysis revealed that an oro–nasal communication was one of the factors that influenced SI without a prosthesis. The resection of the anterior portion of the soft palate was one of the factors that influenced SI with a prosthesis, which suggested that for some of these patients we should consider specific surgical treatment, aimed at the reconstruction in the deep defect extending to the intratemporal fossa. A new classification of maxillary defects has been proposed which will help to predict the grade of postmaxillectomy speech disorder following surgery.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.1998.00238.x
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