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  • 1
    Electronic Resource
    Electronic Resource
    Charge transfer in charge-coupled devices fabricated on AlGaN/GaN heterostructures (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1403-1405 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fabrication and operation characteristics of linear array charge-coupled devices on AlGaN/GaN heterostructures are reported. In transistor mode, a three-stage device behaved as a multiple-gated field effect transistor with a transconductance of 12.8 mS/mm. In shift register mode, charge packages can be injected at one side and detected at the other side with a delay corresponding to the number of transfer electrodes of the device. At a transfer frequency of 6 MHz, the devices exhibited an estimated charge transfer efficiency of 0.94. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121957
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  • 2
    Electronic Resource
    Electronic Resource
    Electron transport in AlGaN–GaN heterostructures grown on 6H–SiC substrates (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 707-709 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigated two-dimensional electron transport in doped AlGaN–GaN heterostructures (with the electron sheet concentration ns(approximate)1013 cm−2) grown on conducting 6H–SiC substrates in the temperature range T=0.3–300 K. The electron mobility in AlGaN–GaN heterostructures grown on SiC was higher than in those on sapphire substrates, especially at cryogenic temperatures. The highest measured Hall mobility at room temperature was μH=2019 cm2/V s. At low temperatures, the electron mobility increased approximately five times and saturated below 10 K at μH=10250 cm2/V s. The experimental results are compared with the electron mobility calculations accounting for various electron scattering mechanisms. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120852
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  • 3
    Electronic Resource
    Electronic Resource
    An HREELS study of π* and σ* negative ion resonances of c(8×2) benzoate on Cu(110) (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 5942-5947 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: For the c(8×2) benzoate on Cu(110) system, multiple unoccupied states have been measured through negative ion resonances by high-resolution electron-energy-loss spectroscopy (HREELS). Based on the azimuthal and polar angle dependences, we assign contributions from B2 and A1 states to a resonant feature in the 〈001〉 direction and contributions from B1 and A1 states in the 〈110〉 direction. The B2 state is observed close to 4.7 eV and the B1 feature is centered at 6.5 eV. The angular and azimuthal dependence of the C–H stretch intensity in HREELS at resonance is consistent with their assignment and the results of ab initio calculations. Overtone intensity shows an exponential decay as a function of overtone quantum number. From the overtone frequencies, an anharmonicity of 0.0272 is obtained which leads to a dissociation energy of the C–H bond of about 81 kcal/mol. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476005
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  • 4
    Electronic Resource
    Electronic Resource
    Impact of Early Stage Incomplete Mixing on Estimating VOC Emissions in Small Test Chambers (1998)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 8 (1998), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Notes: Abstract Most of the existing emission models developed from small-scale chamber tests assume complete mixing in the chamber throughout the test period. This paper examined this assumption using a Computational Fluid Dynamics (CFD) model. The model simulated the three-dimensional air velocity profiles and Volatile Organic Compound (VOC) concentration distributions from wood stain in a well-designed mixing chamber of 1.0X0.8X0.5 m3. The model used measured data to determine the time-dependent VOC surface concentrations of wood stain. The CFD results show that the VOC concentrations in the test chamber were not uniform in the early stage (about 18 minutes). The first-order decay model using the complete mixing assumption will underestimate the Total VOC (TVOC) emission rates by 65% and 59% in the first 3 minutes and next 15 minutes, respectively. Since wood stain emitted about one third of the VOCs in the first 18 minutes, the impact of incomplete mixing in the early period is significant for calculating the material emissions. Furthermore, the mass transfer coefficient of TVOC calculated by CFD is also compared with that calculated by analogue theory and that calculated by experimental correlation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.1998.t01-1-00005.x
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  • 5
    Electronic Resource
    Electronic Resource
    One-dimensional moving polarons with extended coherent states (1998)
    Springer
    The European physical journal 3 (1998), S. 307-313 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.38.+i Polarons and electron-phonon interactions - 63.20.Kr Phonon-electron and phonon-phonon interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The general properties of one-dimensional large Fröhlich polarons in motion are investigated with the previous extended coherent states where two-phonon correlations are considered. As a result, the polaron energy, velocity, effective mass, and average number of virtual phonons as a function the polaron total momentum are evaluated in a wide range of the coupling constant. In addition, rich information about virtual phonons emitted by the electron in motion is obtained. More importantly, some intrinsic features of 1D moving polarons are presented for the first time, which may also be suited to moving polarons in more than one dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050317
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of fluid flow on levelling performance (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 579-587 
    Details
    ISSN: 1572-8838
    Keywords: fluid flow ; levelling ; shape change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The influence of fluid flow on electrode-shape change that results from electrodeposition in the presence of a model, levelling agent is simulated and discussed. The treatment is more rigorous than past studies in that flow and concentration fields are recalculated as the electrode shape changes. It is shown that uncertainties due to approximate treatments of fluid flow may be as significant as existing discrepancies between experiment and theory. A numerical algorithm necessary to minimize errors associated with automatic grid generation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003241917179
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  • 7
    Electronic Resource
    Electronic Resource
    Corticofugal regulation of auditory sensitivity in the bat inferior colliculus (1998)
    Springer
    Journal of comparative physiology 183 (1998), S. 683-697 
    Details
    ISSN: 1432-1351
    Keywords: Key words Bat ; Central auditory sensitivity ; Corticofugal facilitation and inhibition ; Inferior colliculus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Under free-field stimulation conditions, corticofugal regulation of auditory sensitivity of neurons in the central nucleus of the inferior colliculus of the big brown bat, Eptesicus fuscus, was studied by blocking activities of auditory cortical neurons with Lidocaine or by electrical stimulation in auditory cortical neuron recording sites. The corticocollicular pathway regulated the number of impulses, the auditory spatial response areas and the frequency-tuning curves of inferior colliculus neurons through facilitation or inhibition. Corticofugal regulation was most effective at low sound intensity and was dependent upon the time interval between acoustic and electrical stimuli. At optimal interstimulus intervals, inferior colliculus neurons had the smallest number of impulses and the longest response latency during corticofugal inhibition. The opposite effects were observed during corticofugal facilitation. Corticofugal inhibitory latency was longer than corticofugal facilitatory latency. Iontophoretic application of γ-aminobutyric acid and bicuculline to inferior colliculus recording sites produced effects similar to what were observed during corticofugal inhibition and facilitation. We suggest that corticofugal regulation of central auditory sensitivity can provide an animal with a mechanism to regulate acoustic signal processing in the ascending auditory pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050291
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  • 8
    Electronic Resource
    Electronic Resource
    Optical Properties of InGaN/GaN Multiple Quantum Wells (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 264-268 (Feb. 1998), p. 1295-1298 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.264-268.1295.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of pulse repetition rate, pulse intensity, and bicuculline on the minimum threshold and latency of bat inferior collicular neurons (1998)
    Springer
    Journal of comparative physiology 182 (1998), S. 455-465 
    Details
    ISSN: 1432-1351
    Keywords: Key words Pulse repetition rate ; Latency ; Minimum threshold ; Neural inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract This study examines the effect of pulse repetition rate (PRR), pulse intensity, and bicuculline on the minimum threshold (MT) and latency of inferior collicular neurons of the big brown bat, Eptesicusfuscus, under free-field stimulation conditions. It tests the hypothesis that changes in MT and latency of collicular neurons are co-dependent on PRR. The number of impulses in inferior collicular neurons (n = 245) increased either monotonically (25%) or non-monotonically (75%) with pulse intensity. Latencies either decreased to a plateau (72%), fluctuated unpredictably within 3 ms (21%) or changed very little (7%) with increasing pulse intensity. Latencies and MTs of most collicular neurons increased by 1.5–24 ms (mean ± SD = 4.8 ± 3.3 ms) and 4–75 dB (mean ± SD = 22.1 ± 16.2 dB) with increasing PRR. In most neurons (94%), the latency increase was completely (42%) or partially (52%) eliminated when pulse intensity was compensated for the MT increase with PRR. Complete elimination of latency was achieved by bicuculline application. In a few neurons (6%), the latency increase with PRR was not affected by compensated pulse intensity or bicuculline application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050193
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  • 10
    Electronic Resource
    Electronic Resource
    Inoculation mechanism of rare earth–Mg alloy in molten cast iron (1998)
    Springer
    Journal of materials science 33 (1998), S. 985-988 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dissolution region of RE–Mg (RE=rare earth) alloy in the reaction chambers of in-mould inoculated castings was studied by scanning electron microscopy and on electron microprobe. The dissolution region of the inoculant was divided into 7 zones according to its microstructure. The RE–Mg alloy is composed of Mg2Si, a Mg2Si–Si eutectic, FeSi, RE–Mg–Si and other silicides. The dissolution of the alloy is a process in which the low melting point phases such as Mg2Si, a Mg2Si–Si eutectic and RE–Mg–Si dissolve first, and the high melting point phases such as FeSi and FeSi2 dissolve later. In addition, some intermediate products form during the dissolution process. This causes a concentration gradient of Mg and RE in the melt which results in a transition of the graphite morphology from normal spheroid to open nodule, vermicular and flake graphite. The dissolution of the FeSi phase in the melt forms local sites of high silicon concentration which promote the nucleation and growth of the graphite. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004363828646
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