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  • 1
    Electronic Resource
    Electronic Resource
    Acetaminophen as a pain enhancer during voluntary interruption of pregnancy with mifepristone and sulprostone (1990)
    Springer
    European journal of clinical pharmacology 39 (1990), S. 609-609 
    Details
    ISSN: 1432-1041
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316108
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  • 2
    Electronic Resource
    Electronic Resource
    An evaluation of two automated quality control methods designed for use with hourly wind profiler data (1994)
    Springer
    Annales geophysicae 12 (1994), S. 711-724 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The National Oceanic and Atmospheric Administration (NOAA) has completed the installation of a 30-site demonstration network of wind-profiling radars in the central United States. The network is being used to demonstrate and assess the utility of wind profiler technology in a quasi-operational environment, and to help define operational requirements for possible future national networks. This paper describes two automated quality control methods designed to remove erroneous winds from the hourly network data. Case study examples and statistical evaluation of the performance of each method are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-994-0711-2
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  • 3
    Electronic Resource
    Electronic Resource
    A new kind of light-generation mechanism: Incandescent radiation from clusters (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 607-613 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel technique to generate hot refractory metal clusters is explained. A regenerative chemical cycle is used to form small clusters inside a microwave-excited high-pressure discharge which heats the clusters to 4700 K (rhenium) or 3800 K (tungsten). The discharge's emission spectrum exhibits a strong continuum, which is the incandescent radiation of clusters. The spectral shapes of the continua and the positions of their maxima (Re: 550 nm; W: 700 nm) are characteristic of the refractory metal. A first theoretical description of the clusters' radiation can be based on the Mie theory. Measurements of emission and absorption coefficients are performed to determine the optical properties and temperatures of the clusters. The existence of clusters with an average size of about 2.5 nm is proved by a laser scattering experiment. The properties of the cluster radiation, especially the continuous spectrum and the high luminous efficiency, are attractive for lighting applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355274
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  • 4
    Electronic Resource
    Electronic Resource
    Charged particle flow in plasma-filled pinched-electron-beam diodes (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2274-2286 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma-filled pinched-electron-beam diode experiments have been performed on the Gamble II (1.5 MV, 800 kA, 60 ns) pulsed power generator at Naval Research Laboratory. These plasma-filled diode (PFD) experiments show three phases of behavior: a low impedance phase followed by a phase of rapidly increasing impedance that culminates in a relatively constant vacuum impedance phase. The duration of the low impedance phase as well as the final operating impedance depends on the prefill plasma density. The charged particle flow in the PFD is studied with one-dimensional (1-D) and two-dimensional (2-D) simulation models. These simulation models show the formation of growing sheaths at both electrodes during the low impedance phase. The end of the low impedance phase in the simulations coincides with the two sheaths meeting in the center of the anode-cathode (A-K) gap. Based on these observations, an analytic model was developed that treats the low impedance phase as symmetric bipolar sheaths. The analytical model adequately predicts the duration of the low impedance phase predicted by the 1-D simulation model. Differences between the bipolar model and the experiments or 2-D simulations can be explained in terms of magnetized sheaths which enhance the ion current over the bipolar level and cause the sheath to grow faster than the bipolar model. During the rapidly increasing impedance phase, the simulations show that the cathode sheath quickly expands to completely fill the A-K gap. At this time, charged particle flow in the simulation models are consistent with the vacuum gap spacing. Experimentally, the higher density, longer conduction time, PFD shots exhibited a significantly lower final impedances than predicted by 2-D simulations. This difference is probably caused by expanding electrode surface plasmas produced by the interaction of the plasma source with one or both electrode surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354711
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  • 5
    Electronic Resource
    Electronic Resource
    On the flow in the unobstructed space between shrouded corotating disks (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1760-1770 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model of a computer hard disk drive was constructed and measurements of the air flow in the unobstructed space between a pair of disks were obtained. The disks were centrally clamped to a common hub, and rotated within an axisymmetric (cylindrical) enclosure or shroud. Measurements of the circumferential velocity component were made at five radial locations and three rotation rates (Ω=300, 1200, and 3600 rpm) using a laser-Doppler velocimeter. The resulting mean and rms circumferential velocity profiles are presented and discussed. The data show that the circumferential velocity component profiles are fairly uniform in the axial direction in the space between the disks, except near the shroud where the flow is strongly sheared. The circumferential velocity peaks at a critical radius. Between the hub and the critical radius location the flow is in solid body rotation. Between the critical radius and the shroud the circumferential velocity decreases to zero, gradually at first and then very quickly as the shroud is approached. Analysis based on simplified force balance considerations facilitates the interpretation of the experimental observations and leads to improved understanding of the complex flow phenomena. Numerical calculations of the present configuration assuming axisymmetric steady flow were performed by Chang et al. (submitted to Int. J. Heat Mass Transfer). These calculations show reasonable agreement with the averaged velocity data but, for the reasons discussed, fail to reproduce features of the rms distribution associated with nonturbulent flow unsteadiness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857703
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of a microsecond-conduction-time plasma opening switch (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2368-2376 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper presents data and analyses from which emerges a physical picture of microsecond-conduction-time plasma opening switch operation. During conduction, a broad current channel penetrates axially through the plasma, moving it toward the load. Opening occurs when the current channel reaches the load end of the plasma, far from the load. During conduction, the axial line density in the interelectrode region is reduced from its value with no current conduction as a result of radial hydrodynamic forces associated with the current channel. A factor of 20 reduction is observed at opening in a small, localized region between the electrodes. When open, the switch plasma behaves like a section of magnetically insulated transmission line with an effective gap of 2 to 3 mm. Increasing the magnetic field in this gap by 50% results in an improvement of 50% in the peak load voltage and load current rise time, to 1.2 MV and 20 nsec, respectively. An erosion opening mechanism explains the inferred gap growth rate using the reduced line density at opening. Improved switch performance results when the maximum gap size is increased by using a rising load impedance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860207
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  • 7
    Electronic Resource
    Electronic Resource
    A tensile testing machine for stress oxidation kinetic studies in well-controlled conditions (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2666-2670 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe here a tensile testing machine suitable for severe conditions imposed by ultrahigh vacuum and for the different surface analysis techniques associated with it. The apparatus allows to apply a gradually tensile force to a sample ribbon heated to a high temperature by the Joule effect. It gives the experimenter the possibility to rotate the stressed specimen and to adjust its position in front of different requisite analyzers (Auger electron spectrometer, for instance). This tensile testing machine can be used for carrying out kinetic studies on the stress oxidation of metals and alloys at high temperatures in well-determined conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141857
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  • 8
    Electronic Resource
    Electronic Resource
    He–Ne interferometer for density measurements in plasma opening switch experiments : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 5199-5201 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A He–Ne interferometer is used to measure the line-integrated electron density in the plasma of an operating plasma opening switch (POS). A heterodyne technique is used, where an acousto-optic modulator generates a 40-MHz frequency shift between the reference and scene beams. The phase shift is calculated numerically from the zero-crossing times of the beat signal. The precision of the phase measurement is ±0.5°, however, several nonplasma sources of phase shift are present just after the current through the POS is interrupted. In particular, charged particle flow into the vacuum window results in a negative phase shift. This anomalous phase shift is effectively eliminated by using magnets to deflect the particles away from the window. Measurements during POS shots show a localized decrease in line density prior to current interruption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143428
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  • 9
    Electronic Resource
    Electronic Resource
    GEOMETRICAL QUALITY CONTROL IN NUCLEAR POWER STATIONS: AN APPLICATION OF HIGH PRECISION UNDERWATER PHOTOGRAMMETRY† (1990)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 13 (1990), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper presents all the stages involved in the procedure for the determination of the shape of a fuel assembly, which is an essential part of a nuclear power plant and can only be handled underwater. Phototriangulation is used to obtain orientation elements, taking into account light refracting surfaces. Stereomodels are then set up for analytical restitution and the shape parameters for the object can be obtained. The project is a typical example of high precision underwater photogrammetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.1990.tb00718.x
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  • 10
    Electronic Resource
    Electronic Resource
    Nahrungsfaseraufnahme eines ernährungsinteressierten Kollektivs der Schweizer Bevölkerung (1994)
    Springer
    European journal of nutrition 33 (1994), S. 68-78 
    Details
    ISSN: 1436-6215
    Keywords: Ernährungserhebung ; modifizierter 24 hour recall ; NF-Aufnahme ; NF-Quellen ; Dietary survey ; modified 24-h-recall ; dietary fiber intake ; dietary fiber source
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary From May to November 1991, a dietary survey in form of a 24-h-recall questionnaire was carried out in Zurich. For the first time, food data from a large, voluntary, undefined, selected collective was acquired (n=3653). The mean dietary fiber intake of the women was 30 g/day and of the men 33 g/day, which is comparable with various literature data. These values show a positive trend in the eating habits of the population. The dietary fiber intake was also considered in relation to the origin of the fibers.
    Notes: Zusammenfassung In Zürich wurde von Mai bis November 1991 eine Ernährungserhebung in Form eines schriftlichen 24 hour recall durchgeführt. Erstmals wurden Verzehrszahlen eines überdurchschnittlich grossen, freiwilligen, nicht definiert ausgewählten Kollektivs erfasst (n=3653). Die durchschnittliche NF-Aufnahme der Frauen in Höhe von 30 g/Tag und der Männer in Höhe von 33 g/Tag ist mit diversen Literaturwerten vergleichbar und deutet auf eine positive Entwicklung im Ernährungsverhalten der Bevölkerung hin. Der NF-Verzehr wurde nach Herkunft der Fasern aufgeschlüsselt betrachtet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01610580
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