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  • 1995-1999  (10)
  • 1990-1994  (11)
  • 1975-1979  (1)
  • 1965-1969  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of negative gain suppression on the stability of laser diodes (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1874-1876 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of homogeneously pumped single-section laser diodes is analyzed theoretically and it is found that under certain bias conditions negative gain suppression factor laser diodes (NGSFLDs) self-pulsate. An analytical condition for self-pulsation in homogeneously pumped single-section laser diodes is derived. The dynamics of self-pulsating NGSFLDs under direct modulation are analyzed and a quasiperiodic route to chaos is found. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113306
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  • 2
    Electronic Resource
    Electronic Resource
    Ten minutes wasted—you're lucky! (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 47 (1992), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1992.tb04239.x
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  • 3
    Electronic Resource
    Electronic Resource
    Mean flow and turbulence structure over fixed, two-dimensional dunes: implications for sediment transport and bedform stability (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 42 (1995), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Detailed measurements of flow velocity and its turbulent fluctuation were obtained over fixed, two-dimensional dunes in a laboratory channel. Laser Doppler anemometry was used to measure the downstream and vertical components of velocity at more than 1800 points over one dune wavelength. The density of the sampling grid allowed construction of a unique set of contour maps for all mean flow and turbulence parameters, which are assessed using higher moment measures and quadrant analysis. These flow field maps illustrate that: (1) the time-averaged downstream and vertical velocities agree well with previous studies of quasi-equilibrium flow over fixed and mobile bedforms and show a remarkable symmetry from crest to crest; (2) the maximum root-mean-square (RMS) of the downstream velocity values occur at and just downstream of flow reattachment and within the flow separation cell; (3) the maximum vertical RMS values occur within and above the zone of flow separation along the shear layer and this zone advects and diffuses downstream, extending almost to the next crest; (4) positive downstream skewness values occur within the separation cell, whereas positive vertical skewness values are restricted to the shear layer; (5) the highest Reynolds stresses are located within the zone of flow separation and along the shear layer; (6) high-magnitude, high-frequency quadrant-2 events (‘ejections’) are concentrated along the shear layer (Kelvin-Helmholtz instabilities) and dominate the contribution to the local Reynolds stress; and (7) high-magnitude, high-frequency quadrant-4 events occur bounding the separation zone, near reattachment and close to the dune crest, and are significant contributors to the local Reynolds stress at each location. These data demonstrate that the turbulence structure associated with dunes is controlled intrinsically by the formation, magnitude and downstream extent of the flow separation zone and resultant shear layer. Furthermore, the origin of dune-related macroturbulence lies in the dynamics of the shear layer rather than classical turbulent boundary layer bursting. The fluid dynamic distinction between dunes and ripples is reasoned to be linked to the velocity differential across the shear layer and hence the magnitude of the Kelvin-Helmholtz instabilities, which are both greater for dunes than ripples. These instabilities control the local flow and turbulence structure and dictate the modes of sediment entrainment and their transport rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1995.tb00386.x
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  • 4
    Electronic Resource
    Electronic Resource
    POPULATION-BASED SURVEY OF HUMAN SODIUM AND POTASSIUM EXCRETION (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 19 (1992), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. During the 1989 National Heart Foundation Risk Factor Prevalence Survey a subsample in Hobart collected 24 h urine samples to measure electrolyte excretion.2. The ranges were 30-344 mmol/24 h for Na+ excretion (mean 160 mmol/24 h for men, 124 mmol/24 h for women), and 25-119 mmol/24 h for K+ excretion (mean 77 mmol/24 h for men, 68 mmol/24 h for women).3. As in other surveys, women excreted about 20–25% less Na+ and K+ than men, although there was no significant sex difference in the ratio of Na+/K+ excretion.4. The recommended dietary intake (RDI) for Na+ and K+ was followed simultaneously by 19% of subjects, and 13% had a 24 h urinary Na+/K+ ratio ≤ 1.0.5. Observance of the RDI limited the value of iodized salt for goitre prophylaxis.6. Sodium excretion rates were outside the therapeutic range of thiazide diuretics in 22% of subjects.7. Diet groups for long-term prospective cohort studies to test the prophylactic value of avoiding salt could apparently be recruited from existing subsamples of the population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1992.tb00464.x
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  • 5
    Electronic Resource
    Electronic Resource
    Pathology of attachment and vascular damage associated with larval stages of Dissonus manteri Kabata, 1966 (Copepoda: Dissonidae) on the gills of coral trout, Plectropomus leopardus (Lacépède) (Serranidae) (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 17 (1994), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Tissue responses in Plectropomus leopardus gills infested with Dissonus manteri copepodid and ehalimus larvae were almost entirely proliferative, with little or no cellular infiltration. The pathological changes were related to attachment, feeding and parasite size, and comprised progressive mechanical erosion, epithelial hyperplasia and fibrosis. When present, infiltrating cells were associated with initial attachment by the copepodid and with the frontal filament basal plate. Approximately 2.4% of the respiratory area was lost as a result of direct vascular damage. Disruption of branchial blood flow resulted from the burrowing and feeding activities of the larvae and compression of adjacent vessels as the parasite increased in size. Chalimus stages were attached by a frontal filament which consisted of a stem with a terminal anchor, and a basal plate in contact with the cartilaginous filament ray. Following chalimus release, the branchial tissue appeared to repair rapidly. No frontal filament remains were found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1994.tb00241.x
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  • 6
    Electronic Resource
    Electronic Resource
    Chromosome–specific microsatellite sets for fluorescence–based, semi–automated genome mapping (1994)
    [s.l.] : Nature Publishing Group
    Nature genetics 7 (1994), S. 390-395 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] To facilitate large–scale genetic mapping of the human genome, we have developed chromosome–specific sets of microsatellite marker loci suitable for use with a fluorescence–based automated DNA fragment analyser. We present 254 dinucleotide repeat marker loci (80% from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng0794-390
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  • 7
    Electronic Resource
    Electronic Resource
    2,8-Dimethylphenoxathiin 10-Oxide (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 1511-1513 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270198005903
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  • 8
    Electronic Resource
    Electronic Resource
    Power Spectrum of Sporadic- E at Wilkes and Byrd Stations, Antarctica (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 1182-1183 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The sporadic-E critical frequency (foEs) has been scaled at 15-min intervals from the original ionogram film taken at the Antarctic stations, Wilkes and Byrd. Each sample consists of five consecutive days and was selected on the basis of visual inspection of the hourly tabulated values to insure ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2071182b0
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  • 9
    Electronic Resource
    Electronic Resource
    Holography of Diffusely Reflecting Objects using a Double Focus Lens (1969)
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 1234-1235 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The limited resolving power of high speed rapid-processing photographic material like 'Polaroid' 55P/N restricts the permissible angle between wavefronts arriving at the film and, consequently, the angular size of the objects from which holograms can be made. But for studies in which these ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2211234a0
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  • 10
    Electronic Resource
    Electronic Resource
    Holography with a Double Focus Lens : a Simple Lecture Demonstration (1968)
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 942-943 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Any lens with spherical surfaces may be used as a double focus lens, by making use of the second focus formed by light reflected internally at the lens surfaces. The focal power of a weak bispherical spectacle trial case lens is about seven times as great as the marked power for this doubly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/218942a0
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