Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Linewidths in the pure rotational Raman spectra of hydrogen chloride and carbon monoxide and of nitrogen and carbon monoxide perturbed by hydrogen chloride (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 65-69 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Pressure-broadening coefficients, σp, have been determined for self-broadening of pure rotational Raman lines of carbon monoxide and for pure rotational Raman lines of hydrogen chloride, and carbon monoxide and nitrogen perturbed by hydrogen chloride at 293 K. The results are discussed and compared with calculated and experimental σp values in the literature.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    CARS vibration-rotation Q-branch spectrum of hydrogen chloride (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 467-471 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The self-broadening of the Q-branch vibration-rotational lines in the CARS spectrum of HCl was studied over the pressure range 0.002-1.000 bar and the temperature range 298-1048 K. The broadening coefficients, σp, are dependent on J at 298 and 550 K but are independent of J at higher temperatures; the σp value of 1048 K is only about 25% of its value for Jmax at 298 K.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250220808
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Estimation of crystallinity in polyethylene by Raman spectroscopy (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 24 (1993), S. 545-550 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The quantitative determination of crystallinites of polyethylene samples from the analysis of vibrational bands due to δ(CH2) twisting and v(CC) stretching in the Raman spectra between 950 and 1500 cm-1 was assessed. Several methods based on manual resolution of band envelopes and on computer-derived information using Gaussian and Lorentzian profiles were compared. The major source of error was found to be the estimation of the amorphous and crystalline interphase content, αb. A new method for the determination of sample crystallinity is proposed based on the time-dependent Fourier transform deconvolution of the spectral region between 950 and 1500 cm-1, which takes into account the baseline corrections and the influence of vibrational band shoulders in this region to obtain consistent values of αa, αb and αc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250240813
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...