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  • 1990-1994  (18)
  • 1965-1969  (3)
  • 1945-1949  (1)
  • 1930-1934  (3)
  • 1
    Electronic Resource
    Electronic Resource
    A quantum-dot refrigerator (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1815-1817 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A cryogenic refrigeration scheme is presented which utilizes the discrete energy levels of quantum dots to customize the electronic Fermi–Dirac distribution, cooling a small but macroscopic reservoir to far below the ambient temperature. Several physical limitations of this scheme are discussed within the context of a model device constructed from a two-dimensional electron gas. These are explored in a simple example where, at an ambient operating temperature of 150 mK, this quantum-dot refrigerator can achieve a cooling power of 1 μW/cm2, a base temperature of 10 mK, and a cooling efficiency of 35%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110672
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of an ambient-pressure process for the selective hydrogenation of polybutadienes (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 525-529 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00028a005
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The intensity distribution and variance of the iron Kα multiplet (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 2 (1969), S. 240-246 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The variance of the Kα12 doublet of iron X-radiation as a function of truncation range was determined using a silicon analysing crystal. The presence of satellite lines gives rise to an initial `pseudolinear' part to the variance–range curve; the origin and significance of this part are discussed. The effect of the satellite group was removed by interpolation of the line profile. The possibility of locating the background level by computation is investigated; it is shown that a mis-setting in the background level has an appreciable effect on the variance function, whilst a mis-setting in the background slope has negligible effect on the slope of the variance function. Results for both filtered and unfiltered radiation are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889869007138
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Variation of Breakdown Voltage of a Positive-point/Plane Gap with Applied Voltage Waveshape (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 1085-1086 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It was suggested1 that the phenomenon might be due to pre-breakdown corona mechanisms which are dependent on time and could therefore vary with rise-time of any applied impulse voltage. During the discussion on a paper6 concerning the difficulties of installing a 400-kV grid-system in England and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2071085a0
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    Paper (German National Licenses)
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  • 5
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    The Use of Accounting in Business Policy Determination (1947)
    Menasha, Wis. : Periodicals Archive Online (PAO)
    The Accounting Review. 22:4 (1947:Oct.) 394 
    Details
    ISSN: 0001-4826
    Topics: Economics
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5030-1947-022-04-000009
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  • 6
    Electronic Resource
    Electronic Resource
    Types of Iridescent Clouds (1932)
    [s.l.] : Nature Publishing Group
    Nature 129 (1932), S. 798-798 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the winter of 1930–31, I was measuring the height of the aurora in northern Ontario. On one occasion there had been a well-developed single arc which had remained unusually steady throughout the evening, and I was surprised to see at dawn next morning a light band of cloud stretched in a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/129798a0
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  • 7
    Electronic Resource
    Electronic Resource
    A study of leukocytosis in exercise (1932)
    Springer
    European journal of applied physiology 6 (1932), S. 73-83 
    Details
    ISSN: 1439-6327
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Hard muscular work is accompanied by a leucocytosis in normal individuals and trained athletes, the leucocytosis in football players often showing an increase of between 200% and 300%. The magnitude of leucocytosis is related to both the duration and the intensity of work. Excitement alone will not cause a leucocytosis. Intense exertion of short duration produces a lymphocytosis which is followed by a polynuclear stage if the work is continued for a long enough time. The average recovery curve exhibits no appreciable drop in leucocyte count during the two hours following a football game unless the player lies down immediately after leaving the field. The absolute lymphocyte count falls rapidly for an hour or more after the player leaves the game. The rapidity of the leucocyte changes, the evidence against leucocytolysis and the absence of an appreciable increase in theSchilling-Torgau “band-form” cells all point toward a storage phenomenon. The bone marrow, spleen, liver, lungs, and organs of internal secretion must be considered as possible reservoirs, although no definite statement can yet be made as to the relative importance of each. The fact that lactic acid, blood sugar, blood pressure, body temperature, and capillary dilation can be ruled out as separate variables directly related to leucocytosis in exercise points toward a stimulus perhaps more complicated than has yet been studied. Any explanation of leucocytosis in exercise involving only a simple physical mechanism cannot at present be considered adequate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02009854
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  • 8
    Electronic Resource
    Electronic Resource
    Physical performance in relation to external temperature (1931)
    Springer
    European journal of applied physiology 4 (1931), S. 508-518 
    Details
    ISSN: 1439-6327
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010116
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Milbemycin production byStreptomyces sp.: the effect of carbohydrates (1994)
    Springer
    Journal of industrial microbiology and biotechnology 13 (1994), S. 43-48 
    Details
    ISSN: 1476-5535
    Keywords: Milbemycin ; Fructose ; Starch ; Carbon:nitrogen ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Milbemycin production byStreptomyces hygroscopicus RB4569D was examined in media containing different carbohydrates. Total milbemycin titer could be increased by substitution of fructose for glucose and by selection of the appropriate starch type. Total titer could be further enhanced by increasing the concentration of fructose and/or starch in the medium. Rates of carbohydrate utilization were shown to be independent of their initial concentration and increased titers in high carbohydrate media were shown to be due to a prolonged production phase rather than an increased accretion rate. The pattern of individual milbemycin components was governed by the carbon:nitrogen ratio of the medium rather than carbohydrate concentration and there was a critical C:N ratio below which no milbemycin was produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01569661
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Force constant calculations of the LAM-1 modes ofn-alkanes and their substituted α-Monohalo- and α,ω-dihalo- species in their extended zig-zag planar configurations as found in urea inclusion compounds (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 11 (1991), S. 267-279 
    Details
    ISSN: 1573-1111
    Keywords: Force constant calculations ; n-alkanes ; mono-halo and di-halo alkanes ; urea inclusion compounds ; LAM-1 modes ; accordion vibrational modes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Force constants were determined for the C8, C10, C12 and C14 series ofn-alkanes C n H2n + 2 using an approximate SVFF calculation and observed LAM = 1 wave numbers. In this calculation the hydrogen atoms were neglected and only the carbon backbone chain and terminal atoms were considered; this was valid since only low-frequency vibrations were under consideration. Using force constant transfer, the wavenumbers of the LAM = 1 accordion modes for the analogous α-Cn H2n + 1 X and α,ω-Cn H2nX2 species, where X = C1, Br or I were calculated. For α-chloroalkanes and α,ω-dichloroalkanes, them = 1 accordion modes are calculated to be in the 220–130 cm−1 and 200–120 cm−1 regions, respectively. For the bromo- and iodo-analogues them = 1 accordion modes are calculated to be in the 200–100 cm−1, 150–90 cm−1 and in the 170–100, 135–80 cm−1 regions, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061039
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