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  • 1
    Electronic Resource
    Electronic Resource
    Monte Carlo simulation of magnetobirefringence in magnetic fluids : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6142-6144 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On the basis of the consideration that the magnetic-field-induced optical anisotropy is caused by the combined effects of field-induced orientation of shape-anisotropic scatterers and the chain-like aggregation of magnetic particles in external magnetic field, a unified mathematical expression is established and Monte Carlo technique is implemented to simulate the field dependence of magnetobirefringence. Compared with the previous models, this method is more effective in exposing the micro-origin of the phenomena and can be easily extended to calculate other aspects of the effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352728
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  • 2
    Electronic Resource
    Electronic Resource
    Wavelength dependence of the Faraday effect and magnetobirefringence in ferrofluid thin films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6139-6141 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An enhancement of negative Faraday rotation in a dilute ferrofluid was reported near the wavelength of 0.5 μm by Yusuf. The observed phenomenon was explained in terms of a "small particle resonance.'' The premise of the above explanation is debatable. In order to give a more detailed explanation, measurements of Faraday rotation and magnetobirefringence spectra in dense ferrofluid thin films are reported from 0.5 to 2.7 μm, and a mathematical model is derived taking into account a skew-symmetric dielectric tensor for ferrite particles. The experiments confirm that the negative Faraday rotation is predominantly caused by the wavelength dependence of the off-diagonal elements εfxy(λ) of the dielectric tensor of the magnetic particles themselves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352727
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  • 3
    Electronic Resource
    Electronic Resource
    Towards stimulated generation of coherent plasmons in nanostructures (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3708-3712 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A possible generation scheme for growing coherent plasma oscillations (plasma instability) is presented. Specific quantum well structures, where a sufficient population inversion can be maintained in the carrier distribution by appropriate injection–extraction configurations, form the basis of this scheme. Self-consistent random phase approximation calculations show that a population inversion, leading to a plasma instability, can occur in such structures. A comparison between the calculated and the observed differential conductance curves suggests that such quantum well structures could be designed as active regions for the generation of terahertz frequency radiation sources. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369736
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  • 4
    Electronic Resource
    Electronic Resource
    Sources of phase noise in homodyne and heterodyne phase modulation devices used for tissue oximetry studies (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3042-3054 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The objective of this study was to characterize sources of phase noise in homodyne and heterodyne phase modulation devices (PMDs) used for tissue oximetry measurements. Each PMD incorporates a laser diode modulated at a radio frequency in the 50–200 MHz range, an optical detector and a homodyne/heterodyne phase sensitive detector. The intensity modulated light which propagates through tissue is attenuated and undergoes a phase shift, which reflects the mean time of flight of the photons through the tissue. The measured amplitude and phase can be used to determine hemoglobin saturation in tissues using equations based on diffusion theory. Four studies were performed to characterize the sources of phase noise. First, the signal to noise ratio was characterized to determine if the PMDs are operating at the shot noise or detector noise limit. Second, the accuracy of the three PMDs for measuring phase shifts in tissue were compared by using them to measure the phase shift as a function of path length change in air, at a constant amplitude, and at signal to noise ratios comparable to that measured from tissue. The third source of noise measured was the phase shift that results from optical attenuation of the signal (phase-amplitude cross talk) at a constant path length, to characterize intensity dependent phase shifts in the PMDs. Finally, the interchannel interference of a dual wavelength PMD which uses radio frequency multiplexing to perform phase measurements at two wavelengths simultaneously was compared to that of a dual wavelength PMD which uses time multiplexing to perform phase measurements at two wavelengths serially to determine the effect of each on phase error. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149053
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  • 5
    Electronic Resource
    Electronic Resource
    Er/O and Er/F doping during molecular beam epitaxial growth of Si layers for efficient 1.54 μm light emission (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 3383-3385 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Er, together with oxygen or fluorine as co-dopants, has been incorporated into Si during molecular beam epitaxial growth using co-evaporation of Si and Er containing compounds. The Er doping concentration using both Er2O3 and ErF3 can reach a level of ∼5×1019 cm−3 without precipitation, which is at least one order of magnitude higher than a previously reported solid solubility limit for Er in Si. Growth, structural, and luminescence characterization of these Er/O and Er/F doped Si samples are reported. In particular, 1.54 μm electroluminescence has been observed from Er/O doped Si layers at room temperature through hot electron impact excitation. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119178
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  • 6
    Electronic Resource
    Electronic Resource
    Plasmon-based terahertz emission from quantum well structures (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1685-1687 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Growing coherent plasma oscillations (plasma instability) can be generated in quantum well structures, where a sufficient population inversion is maintained in the carrier distribution by appropriate injection–extraction configurations. The collective response characteristics of such structures have been calculated. Such structures have been grown, and their radiation emission spectra observed. The experimental results are in agreement with the theoretical predictions. The emission maximum is in the terahertz frequency range, and occurs at an intersubband plasmon frequency. This shows that population inversion is achieved in these structures. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124791
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  • 7
    Electronic Resource
    Electronic Resource
    Origin of abnormal temperature dependence of electroluminescence from Er/O-doped Si diodes (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2104-2106 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependencies of the current–voltage characteristics and the electroluminescence (EL) intensity of molecular beam epitaxy grown Er/O-doped Si light emitting diodes at reverse bias have been studied. To minimize the scattering of electrons injected from the p-doped Si1−xGex electron emitters, an intrinsic Si layer was used in the depletion region. For many diodes, there is a temperature range where the EL intensity increases with temperature. Data are reported for a structure that shows increasing intensity up to 100 °C. This is attributed to an increasing fraction of the pumping current being due to phonon-assisted tunneling, which gives a higher saturation intensity, compared to ionization-dominated breakdown at lower temperatures. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1359781
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  • 8
    Electronic Resource
    Electronic Resource
    ISOLATION AND CHARACTERIZATION OF POLYPHENOLIC COMPOUNDS IN CRANBERRIES (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), 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: Methanolic extracts of cranberries were evaporated and reextracted with ethyl acetate. Residues from the dried ethyl acetate extract were isolated by thin-layer, column, and paper chromatography. A large diffuse area indicated the presence of high molecular weight polymeric polyphenols. In addition, seven discrete spots were identified as: (a) catechin; (b) epicatechin; (c) a dimeric epicatechin with a C4-C8 linkage; (d) an unknown polymer which degraded on acid hydrolysis to three compounds, of which one was cyanidin; (e) an unknown polymer which degraded to at least four compounds of which one was cyanidin and one was the compound described above as (d). Compounds (f) and (g) were present in very small amounts. These compounds may contribute to the astringency of cranberries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1978.tb02502.x
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  • 9
    Electronic Resource
    Electronic Resource
    ANTHOCYANINS OF ORNAMENTAL CHERRIES (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 40 (1975), 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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1975.tb01037.x
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  • 10
    Electronic Resource
    Electronic Resource
    ANTHOCYANINS OF POMEGRANATE, Punica granatum (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 40 (1975), 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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1975.tb02217.x
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