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  • 1
    Electronic Resource
    Electronic Resource
    Erratum: "Diffusion across a layered medium and relation to transport in thermonuclear plasmas" [Phys. Plasmas 2, 4230 (1995)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 248-248 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872615
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion across a layered medium and relation to transport in thermonuclear plasmas (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4230-4235 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The generic characteristics of diffusion in a medium exhibiting strong variations of the diffusivity are considered. The varying diffusivity is parametrized by alternating layers of high and low diffusivity. The limiting case is considered that the insulating layers determine the net transport. Some salient features of tokamak transport, such as the fact that perturbative experiments yield a higher diffusivity than a steady-state power balance, are shown to be a natural result of the inhomogeneity. The importance of a possible inhomogeneous diffusivity for the comparison of measurements with theoretical expressions for the diffusivity is discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871468
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  • 3
    Electronic Resource
    Electronic Resource
    Random telegraph signals and 1/f noise in a silicon quantum dot (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 1523-1526 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigated random telegraph signals and 1/f noise in a submicron metal–oxide–semiconductor field-effect transistor at low temperatures in the Coulomb-blockade regime. The rich noise characteristics were studied as a function of gate voltage, drain current, and temperature, both in and beyond the Ohmic regime. The results can be understood within a simple model assuming a uniform potential fluctuation of constant magnitude at the location of the dot. Clear signatures of electron heating are found from the noise at higher currents. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370924
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  • 4
    Electronic Resource
    Electronic Resource
    Single electron tunneling and suppression of short-channel effects in submicron silicon transistors (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 5052-5056 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report measurements on submicron metal–oxide–semiconductor field effect transistors equipped with a gate on three sides of the channel. At room temperature, a strong suppression of short-channel effects has been achieved for the narrowest channels. At liquid helium temperatures, the same devices exhibit clear conductance oscillations in the subthreshold regime, indicating that a quantum dot has formed in the disordered channel. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368753
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  • 5
    Electronic Resource
    Electronic Resource
    Evaluating the effects of optical and carrier losses in etched-post vertical cavity lasers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5871-5875 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate the combined effects of optical scattering loss and surface recombination (or carrier diffusion) on the performance and scalability of etched-post vertical cavity lasers (VCLs). The size dependence of optical losses and threshold gain are determined from pulsed measurements of external quantum efficiency. Deeper etch depths result in a stronger radial dependence of the threshold gain, which quickly increases the threshold current density. With optical loss accounted for, pulsed threshold current density measurements give the extra information needed for evaluating carrier loss. Surface recombination or carrier diffusion also results in threshold current density increases, but scalability is ultimately limited by the ability of the active region to provide enough gain for smaller size, higher optical loss devices. Even with these losses, three-quantum-well VCLs with shallow etches have threshold currents as low as 420 μA. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360588
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  • 6
    Electronic Resource
    Electronic Resource
    Generation of picosecond pulses at millimeter wavelengths (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1483-1485 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report here on an experiment in which picosecond electron pulses, produced by a compact radiation frequency (rf) electron gun, were used to excite a rectangular waveguide, generating 5 ps pulses of radiation with a bandwidth of ∼200 GHz. The interaction of the electron pulses with the waveguide can be modeled quite simply by performing a harmonic expansion of the pulse train produced by the electron gun and employing Poynting's theorem to compute the power coupled into the modes of the waveguide by each harmonic. The resulting model for the distribution of spectral power yields good agreement with the observed spectrum. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114502
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  • 7
    Electronic Resource
    Electronic Resource
    Termination of Living Anionic Polymerizations Using Chlorosilane Derivatives: A General Synthetic Methodology for the Synthesis of End-Functionalized Polymers (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 3380-3388 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00117a008
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  • 8
    Electronic Resource
    Electronic Resource
    Emotional adjustment of children and adolescents with haemophilia in relation to the HIV threat (1997)
    Oxford, UK : Blackwell Science Ltd
    Haemophilia 3 (1997), S. 0 
    Details
    ISSN: 1365-2516
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A Dutch nation-wide study on young haemophilia patients, whose former treatment placed them at risk for HIV infection, was done to examine the effect of HIV testing, HIV status, disclosure of HIV status and the child's experiences with disease-related information on emotional adjustment. In the Netherlands HIV tests are not routinely performed for paediatric haemophilia patients, but the number of HIV-infected children is estimated to be low (8%). Seventy-two boys with haemophilia, five HIV positive, 51 HIV negative and 16 not tested, and their mothers were interviewed and administered standardized questionnaires. Multiple regression analyses showed no differences in anxiety and depression between HIV-positive, HIV-negative or untested boys, nor between children who were informed or not informed about their HIV status. Conversely, children who experienced more difficulties to obtain information about the their disease were significantly more anxious and tended to be more depressed. No significant differences in emotional distress were found between the patients and a standardization sample of healthy peers. The data provide evidence that children and adolescents with haemophilia cope effectively with their disease and the emotional impact of the HIV threat. There seems to be no reason to protect children from testing or knowing their HIV status. In the absence of compelling medical reasons, however, health care workers should not forcefully advocate testing or early disclosure. Distinct disease and treatment-related factors as well as social factors modify disclosure practices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2516.1997.00076.x
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  • 9
    Electronic Resource
    Electronic Resource
    Management und Kontrolle lebensbedrohender hochkontagiöser Infektionskrankheiten (1999)
    Springer
    Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz 42 (1999), S. 389-401 
    Details
    ISSN: 1437-1588
    Keywords: SchlüsselwörterVirusbedingte hämorrhagische Fieber (Ebola Marburg ; Lassa ; Krim-Kongo) ; Pest ; Seuchenhygiene ; Quarantäne ; Internationale Gesundheitsvorschriften ; Reisemedizin ; Tropenkrankheiten ; Emerging diseases ; öffentlicher Gesundheitsdienst ; Zivilmilitärische Zusammenarbeit ; Key words Viral Haemorrhagic Fevers (Ebola-Marburg Viral Diseases ; Lassa Fever ; Crimean-Congo Haemorrhagic Fever) ; Pneumonic Plague ; Control of Epidemics ; Quarantine ; International Health Regulations ; Travelling Medicine ; Tropical Diseases ; Emerging Diseases ; Public Health (Services) ; Civilian-Military Co-operation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary At present, the importation into Germany of life-threatening and highly contagious diseases such as pneumonic plague and Ebola is unlikely, but cannot be ruled out. In spite of the extreme rarity of these diseases, guidelines are necessary to prevent the spread of these agents in case of their importation. In Germany, marked regional differences exist with respect to the development of emergency regulations and the availability of specialized centers for diagnostics and therapy. A federal framework is missing. A concept is presented here in which the capacity to respond is substantially augmented with limited additional cost through inter-regional cooperation using existing infrastructure and federally standardized procedures.
    Notes: Zusammenfassung Ein Einschleppen lebensbedrohender und zugleich hochkontagiöser Infektionskrankheiten wie Lungenpest oder Ebola-Fieber nach Deutschland erscheint zur Zeit nicht sehr wahrscheinlich, ist aber grundsätzlich nicht auszuschließen. Gerade wegen der Seltenheit des Auftretens einer solchen Erkrankung sind jedoch auch hierzulande Handlungsrichtlinien notwendig, um gegebenenfalls einer Verbreitung entgegenzuwirken. Die Entwicklung konkreter Schutzvorkehrungen und Handlungsalgorithmen sowie das Vorhalten geeigneter Diagnostik- und Behandlungseinrichtungen ist in den einzelnen Regionen Deutschlands sehr unterschiedlich ausgeprägt. Ein bundesweiter Rahmenplan fehlt. Der vorliegende Konzeptentwurf zeigt, wie die Vorsorge mit vertretbarem finanziellen Mehraufwand durch eine gemeinsame überregionale Nutzung der z. T. vorhandenen Infrastruktur und durch eine Vereinbarung bundeseinheitlicher Vorgehensweisen wesentlich verbessert werden kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001030050124
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  • 10
    Electronic Resource
    Electronic Resource
    Fabrication and characteristics of double-fused vertical-cavity lasers (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 475-485 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We discuss the fabrication process and characteristics of three consecutive runs of double-fused 1.5-μm vertical-cavity lasers. We have measured light-current characteristics of over three hundred lasers with ten different diameters between 6 and 60 μm and observe a yield of over 95%. The process and design improvements resulted in a low pulsed threshold current of 3 mA on a number of 6- and 8-μm-diameter devices and threshold current density of 2 kA cm−2 on 60-μm-diameter devices at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00943615
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