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  • 1
    Electronic Resource
    Electronic Resource
    Fundamental and harmonic mixing at 500 GHz using a superconductor-insulator-normal metal junction (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3829-3831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have demonstrated fundamental and harmonic mixing using a PbInAu/InOxPbOx/Ag superconductor-insulator-normal metal tunnel junction mixer designed to operate over the 450–550 GHz frequency range. Direct mixing experiments at up to 1.8 times the gap frequency of the tunnel junction have shown that the mixer works in both fundamental and second harmonic modes, with the highest conversion from the fundamental mode obtained at bias voltages near the gap voltage and the highest conversion from the harmonic mode obtained at zero bias. The measured mixer conversion curves are consistent with our five-port model simulations based on Tucker's quantum mixer theory [IEEE J. Quantum. Electron. QE-15, 1234 (1979)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352284
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  • 2
    Electronic Resource
    Electronic Resource
    Thermally stimulated current of Li+ ion-implanted amorphous selenium (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3119-3123 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A thermally stimulated current (TSC) technique is applied to examine the activation energy, capture cross sections, escape frequency, and trap polarity in amorphous Se (a-Se) implanted with low energy (〈20 keV) Li+ ions. TSC glow curves for Li+ -ion-implanted a-Se show two peaks near 230 and 330 K. The value of δ/ω is 0.46 for 230 K, which means that the thermally stimulated currents are due to the first-order kinetics. The trap activation energy levels obtained by peak shape method and various heating rate methods are distributed from 0.22 to 0.33 eV for the 230-K peak and to 1.42 eV for the 330-K peak. The values of the capture cross section and the escape frequencies are 2.75×10−19 cm2 and 5.5×105 s−1 for the 230-K peak, and 5.75×10−20 cm2 and 6.43×105 s−1 for the 330-K peak, respectively. It is found that the trapped charge carriers are mainly holes in Li+ ion-implanted a-Se.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348578
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  • 3
    Electronic Resource
    Electronic Resource
    Thermally stimulated current of amorphous selenium (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3115-3118 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Deep trap properties such as activation energy, capture cross section, and polarity in the amorphous selenium bulk are investigated using a thermally stimulated current (TSC). Two peaks are found near 220 and 330 K in the TSC curve, and the activation energies corresponding to these two peaks are distributed from 0.20 to 0.22 eV and from 1.04 to 1.10 eV. It is found that the trapped carriers near the temperature 220 K are mainly holes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348577
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  • 4
    Electronic Resource
    Electronic Resource
    Harmonic mixing in a superconducting tunnel junction (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4192-4198 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical analysis of harmonic mixing in a quasiparticle tunnel junction at Vbias=0 shows that harmonic mixing for submillimeter frequencies is a viable alternative to fundamental mixing. It is also shown that the signal gain from the first harmonic above the pump frequency to the intermediate frequency is independent of the embedding admittance at the pump frequency. In fact, we show that the five-port model reduces to the three-port model as a result of the inversion symmetry of the I-V curve and, moreover, no large-signal analysis is necessary. Full simulations of harmonic mixing using a five-port model confirm these results. The simulations have been done for the case of a superconductor-insulator-normal junction in which there is no pair current interference. For this type of harmonic mixer we show that the local oscillator (LO) power requirement can be less than a fundamental mixer operating at the same signal frequency, which is particularly useful in circumventing the problems of high-frequency LO power generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346235
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  • 5
    Electronic Resource
    Electronic Resource
    Microwave spectrum, structure, dipole moment, and Coriolis coupling of 1,1-difluoroallene (1974)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 96 (1974), S. 3805-3809 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00819a015
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  • 6
    Electronic Resource
    Electronic Resource
    Flavor Migration Out of Food Matrices: I. System Development for On-line Measurement of Flavor Concentration (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: To obtain useful and meaningful information on the contributions of rates of flavor migration and kinetics of degradation under various conditions, the goal of this study was to develop an apparatus for on-line measurement of flavor concentration, to formulate a thermally stable flavor-dough system and to accomplish isothermal heating. Methodology for measuring on-line flavor concentration in effluent gas from a closed vessel is discussed in this paper. Performance of the on-line apparatus for measuring flavor concentration with a cold-trap on-line sampling method was verified by conducting a series of recovery and retention experiments on 4 flavor compounds. Good quantitative recovery data were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2003.tb08241.x
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  • 7
    Electronic Resource
    Electronic Resource
    Flavor Migration Out of Food Matrices: II. Quantifying Flavor Migration from Dough Undergoing Isothermal Heating (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new approach using cold-trap, on-line sampling was applied to investigate migration rate of limonene, tert-butylbenzene, and pyrazine in a flour dough matrix. Flavor equilibrium concentration and migration rates were shown to be strong functions of initial concentration. Due to encapsulation of flavor compounds at lower moisture content, it was not possible to totally extract the flavor compounds from the matrix by solvent extraction. The cold-trap online sampling method could be satisfactorily used to generate data on flavor migration rates in dough matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2003.tb08266.x
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  • 8
    Electronic Resource
    Electronic Resource
    True Thermal Conductivity Determination of Moist Porous Food Materials at Elevated Temperatures (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 63 (1998), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Thermal conductivity (k) of bread samples, moisture content 5% to 44%, (w/w, wet basis) and porosity 0.18 to 0.90, was measured in a sealed stainless steel vessel using the probe method from 25 to 85°C. Significant differences were observed in measured thermal conductivity before and after air pressure was applied to the sample indicating the influence of vapor phase moisture migration on thermal conductivity. The difference increased as temperature and moisture content were increased. True thermal conductivity of bread was found to agree with predictions using a volume fraction model when moisture migration was completely suppressed at an applied air pressure of 18 atm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1998.tb15855.x
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  • 9
    Electronic Resource
    Electronic Resource
    Vibrational spectra of trans- and cis-crotononitrile (1971)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 75 (1971), S. 44-55 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100671a008
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  • 10
    Electronic Resource
    Electronic Resource
    Towards the identification of later seismic phases (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 123 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The location of seismic events can be improved if accurate picks can be assigned for later seismic phases, which requires both the detection of an arrival and the recognition of its character. Such phase identifications are particularly valuable if they can be provided in real-time as the seismic disturbance passes across a broad-band seismic recording station.A simple but promising scheme for characterizing arrivals can be constructed by analysing the energy content of the seismic trace as a function of time. Such an approach can be used to detect arrivals by using a method comparing the short-term average energy to a long-term average, with averaging windows that are adaptive to the local frequency of the seismic disturbance. The phase detector can be tuned to different classes of arrivals by utilizing three-component records. By comparing the energy on the vertical component of motion to that in the horizontal plane, it is possible to start to separate P and S arrivals. Phase assignments can be refined by the use of adaptive filtering and by including polarization information.With an estimate of the azimuth of propagation it is possible to use approximate projection methods which attempt to compensate for the influence of the free surface, since the surface corrections are not a strong function of slowness for teleseismic arrivals. By this means, an instantaneous estimate can be made of the relative contributions of P, SV and SH arrivals which can be very helpful in determining the phase assignment for a particular arrival.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06901.x
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