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  • 1
    Electronic Resource
    Electronic Resource
    Three color coherent generation and control of current in low-temperature-grown GaAs (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2014-2016 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate coherent generation and control of electrical currents in low-temperature-grown GaAs at 300 K using three phase-related, 150 fs pulses derived from a parametric process. Interference between single photon (0.8 μm) and nondegenerate two photon (1.4 and 1.8 μm) absorption amplitudes generates ballistic electrical currents whose beam polarization dependence is in agreement with a simple Fermi's golden rule calculation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123731
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  • 2
    Electronic Resource
    Electronic Resource
    THz emission from coherently controlled photocurrents in GaAs (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3959-3961 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report broadband terahertz radiation from ballistic photocurrents generated via quantum interference of one- and two-photon absorption in low-temperature-grown and semi-insulating GaAs at 295 K. For 90 fs, 1550 and 775 nm optical pulses, we obtain phase-controllable near-single cycle 4 THz radiation. Higher frequency THz emission should be achievable with shorter pulses. At a 250 kHz repetition rate and average powers of 10 mW (1550 nm) and 400 μW (775 nm), we measure 3 nW of THz power, limited mainly by phase walkoff of the optical beams within the 1.5-μm-thick sample and collection efficiency. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125531
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  • 3
    Electronic Resource
    Electronic Resource
    Petroleum (1979)
    s.l. : American Chemical Society
    Analytical chemistry 51 (1979), S. 211-211 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50041a013
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  • 4
    Electronic Resource
    Electronic Resource
    Wisconsin Educational Telephone Network: how to run educational teleconferencing successfully (1983)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of educational technology 14 (1983), S. 0 
    Details
    ISSN: 1467-8535
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Education
    Notes: For a decade and a half the residents of the state of Wisconsin have had access to a distance education service that has few rivals in the world. Centred on the capital Madison, the University of Wisconsin's Educational Telephone Network (ETN) links together over 200 classrooms across the state on what is virtually a huge ‘party line’, enabling students to listen to a lecture or panel discussion, ask questions and exchange ideas with other students hundreds of miles distant. There can be little doubt that the service has been highly successful, as the growth in the network and its facilities clearly testifies. This paper summarizes documentary data concerning the network, and attempts to identify the chief reasons for its success by examining network services, operation, administrative organization, and performance in meeting the needs of the individuals and organizations that use it. From this analysis four reasons for ETN's success are identified: (1) the network forms an integral part of the University of Wisconsin-Extension's state-wide teaching responsibilities and services, (2) the service meets the needs of a single, well-defined audience sector, (3) regional organization of the telephone network has enabled ETN to benefit from large-scale operations, and (4) programme support services may compensate for differences between telephone and face-to-face conferencing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-8535.1983.tb00452.x
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of prevalence of Ligula intestinalis (L.) in Catostomus commersoni (Lacépède) (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 25 (1984), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Prevalence of Ligula intestinalis in Catostomus commersoni was followed in four lakes near Algonquin Provincial Park, Ontario from 1963 to 1981. Two lakes remained in the natural state, except for regular sampling, and prevalence of the parasite fluctuated from 0.3 to 3.6% and from 1.5 to 13%. Prevalence was higher in fishes from the other two lakes. Fishes in the latter two lakes were removed with ichthyotoxin during the study. Fishes and parasite subsequently recolonized the lakes. Prevalence of the parasite peaked and then declined during recovery in each of the two lakes. Prevalence of the parasite fluctuated around levels which were unique for each of the four lakes. Differences in the level of prevalences among the lakes were probably most dependent on differences in the morphology of the lake basins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1984.tb04860.x
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  • 6
    Electronic Resource
    Electronic Resource
    Raman and infrared spectra of solid chlorofluoromethane (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 429-433 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman and infrared spectra of solid CH2CIF (Freon 31) were recorded in both the lattice and internal mode regions for samples at temperatures between 12 and 125 K. No evidence of any solid-state phase transition was found, but some thin-film samples deposited at low temperatures appear to exist in a metastable phase. Spectra of the stable phase are compatible with a non-centrosymmetric unit cell containing four molecules. Lattice peaks are assigned on the basis of geometrical and intensity arguments.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250609
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