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
Filter
  • 1990-1994  (6)
  • 1920-1924
  • 1993  (4)
  • 1992  (2)
Source
Material
Years
  • 1990-1994  (6)
  • 1920-1924
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Femtosecond four wave mixing spectroscopy of conjugated polymers (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1597-1606 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time-resolved four wave mixing (4WM) signals of conjugated polymers are calculated using a density matrix approach and the Hartree–Fock approximation. The influence of the Coulomb interaction as well as size effects on the nonlinear optical response are examined. For the Hückel model (no Coulomb interaction), quantum beats due to the coherent excitation of several band states are found for small sizes, and photon echo-like behavior is obtained for infinite size. The Coulomb interaction changes the nature of the response and gives rise to a broad delayed signal whose temporal profile is determined by the dephasing time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465328
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    PANTOPRAZOLE AND 24-HOUR INTRAGASTRIC ACIDITY (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 7 (1993), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2036.1993.tb00077.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Chlorate and oxygen formation in alkali chloride membrane electrolysis (1993)
    Springer
    Journal of applied electrochemistry 23 (1993), S. 103-107 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract During the operation of an industrial-scale membrane electrolysis plant over a number of years, a record was kept of the formation of the byproduct oxygen in the anode gas and chlorate in the anolyte parallel to the decline of the current efficiencies of the main products. It was found that the current efficiencies of the byproducts increase linearly with the declining current efficiencies of the main products, chlorine and caustic soda. Of the two types of anode used, one exhibited considerably more oxygen formation than the other. The high-oxygen anode was associated with distinctly lower chlorate formation than the low-oxygen anode. The increasing oxygen contents and chlorate formation rates associated with falling caustic current efficiency are reported for both types of anode. If hydrochloric acid is used to destroy the chlorate, the amount of acid must be increased as the caustic current efficiency falls. The amounts of hydrochloric acid required for the two types of anode are calculated as examples for 96% and 93% caustic current efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00246945
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The influence of different levels of PEEP on peripheral tissue perfusion measured by subcutaneous and transcutaneous oxygen tension (1992)
    Springer
    Intensive care medicine 18 (1992), S. 474-478 
    Details
    ISSN: 1432-1238
    Keywords: Subcutaneous oxygens tension ; Transcutaneous oxygen tension ; Tissue perfusion ; PEEP ; Cardiac output ; Oxygen delivery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective To compare subcutaneous (PscO2) and transcutaneous (PtcO2) oxygen tension measurements in relation to hemodynamic variables at different levels of PEEP, and to evaluate the usefulness of these measurements as monitors of peripheral tissue perfusion. Design Prospective trial. Setting Intensive care unit in a university hospital. Patients Seven patients with gastric cancer who where undergoing total gastrectomy. Interventions Silicone catheter was placed in the upper arm and transcutaneous oxygen monitor was placed on the upper part of the chest. A pulmonary artery catheter was placed in the right pulmonary artery. Measurements and results PscO2 and PtcO2 together with hemodynamic variables were measured at different levels of PEEP. Progressive increase of PEEP reduced cardiac index (CI) (p〈0.05) with a concomitant decrease of PscO2 (p〈0.05) and oxygen delivery (DO2) (p〈0.05). Changes in PtcO2 parallelled changes in arterial oxygen tension (PaO2), but no correlation was found between PtcO2, CI and DO2. Conclusion PscO2 is a sensitive indicator of subcutaneous tissue perfusion, which can be used to identify the PEEP level, with optimum peripheral perfusion. PscO2 seems to be a more reliable indicafor of tissue perfusion than PtcO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01708584
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    On integer points in polyhedra (1992)
    Springer
    Combinatorica 12 (1992), S. 27-37 
    Details
    ISSN: 1439-6912
    Keywords: 52 A 25 ; 90 C 10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We give an upper bound on the number of vertices ofP I , the integer hull of a polyhedronP, in terms of the dimensionn of the space, the numberm of inequalities required to describeP, and the size ϕ of these inequalities. For fixedn the bound isO(m n ϕ n− ). We also describe an algorithm which determines the number of integer points in a polyhedron to within a multiplicative factor of 1+ε in time polynomial inm, ϕ and 1/ε when the dimensionn is fixed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01191202
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of photo-induced dissociation of Na clusters deposited on Mica (1993)
    Springer
    The European physical journal 28 (1993), S. 321-329 
    Details
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 32.80.Wr ; 33.80.Gj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Na clusters bound to mica surfaces have been irradiated with pulsed and cw visible laser light. Kinetic energy and angular distributions of the Na atoms desorbing from the clusters have been determined using cw two-photon laser-induced fluorescence detection. In addition the dependence of the desorption rate on laser power, wavelength and polarization has been measured. The most probable kinetic energyE kin of the photodesorbed atoms at the surface temperatureT S =300 K was found to beE kin=18±5 meV, independent of laser irradiance (3 µJ/cm2...20 mJ/cm2) and wavelength (450 nm, 505 nm, 658 nm). With increasing orientation angle between detection axis and surface normal (0°≦Θ≦90°)E kin was observed to decrease slightly, while it was nearly independent of surface temperature betweenT S =30 K andT S =300 K. Also, with increasing radius of the Na clusters the desorbing Na atoms slowed down. The angular distribution of the Na atoms was of cos2-type with respect to the surface normal. These observations suggest that laser-induced desorption of Na from Na clusters bound to mica surfaces involves an initial rate-limiting step of direct surface plasmon excitation followed by a final step of delayed thermal desorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437267
    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...