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  • 1985-1989  (47)
  • 1955-1959  (7)
  • 1940-1944  (1)
  • 1880-1889  (8)
  • 1870-1879  (2)
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Year
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  • 11
    Electronic Resource
    Electronic Resource
    A stabilized vapor liquid interface in deuterated cyclohexane–methanol mixtures (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3631-3635 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ellipticity of the vapor–liquid interface above mixtures of methanol (CH3OH) and deuterated cyclohexane (C6D12) has been measured in the vicinity of the consolute point. The data above and below Tc are consistent with models for the structure of the interface adapted from the theory of Widom and Ramos-Gomez and Widom. As three-phase coexistence is approached, the quantity of methanol adsorbed at the interface increases whether ordinary or deuterated cyclohexane is used in the mixture. If ordinary cyclohexane were used for studies within the three-phase region below Tc, thick, unstable, lenticular films of the methanol-rich liquid phase would form at the interface and lead to nonreproducible data. In the present measurements lenticular films do not form when deuterated cyclohexane is used in the mixture. (The entire methanol-rich phase then forms on top.) The gravitationally stable interface above the deuterated mixture can be studied reliably in the three-phase region below Tc even though the liquid phases are nearly density matched.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450934
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Photoinduced reorientation in an electron donor–acceptor complex: An optically detected ENDOR study of triplet traps in anthracene/tetracyanobenzene (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 584-589 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have performed an optically detected electron-nuclear double resonance (ODENDOR) study of one of the low-lying triplet excitations in the charge transfer complex anthracene/tetracyanobenzene. The study shows that the spectroscopic characteristics associated with this specific excitation are related to an almost complete charge transfer from anthracene to a nearest neighbor tetracyanobenzene molecule. This photoinduced charge transfer results in a reorientation of the (effectively charged) partners of the EDA complex. The possible impact of this result for the other types of low-lying triplet excitations is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450604
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Rotational relaxation in the H2CO A˜ 1A2 state by transient gain spectroscopy (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 5755-5756 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new, pulsed pump–cw probe technique, transient gain spectroscopy, has been used to measure the zero pressure lifetime (279±10 ns) and self-collision depopulation rate (110.5±3.1 μs−1 Torr−1) for the H2CO A˜ 1A2 41 JKa,Kc =132,12 level as well as the 122,11←132,12(31±8 μs−1 Torr−1) and 142,13←132,12(40±6 μs−1 Torr−1) rotational relaxation rates. The dominant collisional process is rotational energy transfer, which, for the H2CO(A˜)+H2CO(X˜) process examined here, appears to follow dipole–dipole scaling and propensity rules. The 110.5 μs−1 Torr−1 depopulation rate in the A˜ state agrees with the vibrationless X˜ state rate obtained from microwave power broadening scaled by the 1.46 D/2.33 D electric dipole moment ratio. The two strongest a-dipole rotational state-to-state rates account for more than 50% of the total removal rate from H2CO A˜ 41 132,12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448564
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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    Über den Ursprung der Lymphelemente der Tränendrüse (1942)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 145 (1942), S. 381-388 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01854075
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    Paper (German National Licenses)
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  • 15
    Electronic Resource
    Electronic Resource
    Convexity preserving interpolation with exponential splines (1986)
    Springer
    Computing 36 (1986), S. 335-342 
    Details
    ISSN: 1436-5057
    Keywords: 65D07 ; 41A15 ; 90C20 ; Convexity conditions ; weakly coupled system of inequalities ; numerical algorithms ; quadratic programming ; unconstrained dual program with tridiagonal Hessian
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Während die Aufgabe der konvexen Interpolation im Falle kubischer Splines im allgemeineen nicht lösbar ist, kann jetzt gezeigt werden, daß sie bei Verwendung von Exponentialsplines Lösungen besitzt sofern die vorkommenden Parameter hinreichend roß sind, und es werden konkrete hinreichende und notwendige Lösbarkeitsbedingungen hergeleitet. Da eindeutige Lösbarkeit in der Regel nicht vorliegt, wird eine Auswahlfunktion eingeführt und das entstehende quadratische Optimierungsproblem nach Dualisierung numerisch behandelt.
    Notes: Abstract Sufficient and necessary conditions are derived under which interpolating splines are convex if the data set is in convex position. In order to select one of the interpolants, by means of a well-known objective function a quadratic optimization problem is stated which can be solved effectively by passing to a dual program.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02240208
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    Paper (German National Licenses)
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  • 16
    Electronic Resource
    Electronic Resource
    Convex spline interpolants with minimal curvature (1985)
    Springer
    Computing 35 (1985), S. 219-229 
    Details
    ISSN: 1436-5057
    Keywords: 65K05 ; 65D07 ; 90C20 ; 41A15 ; Existence conditions ; quadratic programming ; dual optimization problem ; tridiagonal Hessian ; Newton's method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Das Problem, konvexe Interpolationssplines mit minimaler mittlerer Krümmung zu ermitteln, führt auf eine speziell strukturierte quadratische Optimierungsaufgabe. In der vorliegenden Note wird eine zugehörige duale Aufgabe aufgestellt, die ohne Nebenbedingungen auskommt, deren Zielfunktion stückweise quadratisch ist und die daher eine effektive numerische Behandlung erlaubt.
    Notes: Abstract The problem of finding convex spline interpolants with minimal mean curvature leads to a quadratic optimization problem of special structure. In the present note a corresponding dual problem without constraints is derived. Its objective function is piecewise quadratic and therefore admits an effective numerical treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260507
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    Paper (German National Licenses)
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  • 17
    Electronic Resource
    Electronic Resource
    Positive interpolation with rational quadratic splines (1987)
    Springer
    Computing 38 (1987), S. 261-267 
    Details
    ISSN: 1436-5057
    Keywords: 65D07 ; 41A15 ; Existence conditions ; construction os positive splines ; minimization of the curvature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Unter positiver Interpolation wird die Aufgabenstellung verstanden, zur einer nichtnegativen Datenmenge nichtnegative Interpolierende zu konstruieren. Im Fallen rational-quadratischer Splines wird eine notwendige und hinreichende Bedingung für die Durchführbarkeit positiver Interpolation hergeleitet, und es wird gezeigt, daß diese sich bei passender Wahl der vorkommenden Parameter stets erfüllen läßt.
    Notes: Abstract A necessary and sufficient criterion is presented under which the property of positivity carry over from the data set to rational quadratic spline interpolants. The criterion can always be satisfied if the occuring parameters are properly chosen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02240100
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    Paper (German National Licenses)
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  • 18
    Electronic Resource
    Electronic Resource
    Host examination walk and oviposition site selection ofTrichogramma minutum: Studies on spherical hosts (1989)
    Springer
    Journal of insect behavior 2 (1989), S. 143-171 
    Details
    ISSN: 1572-8889
    Keywords: host examination ; host recognition ; locomotion ; parasitoid ; Trichogramma minutum ; oviposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The host examination behavior of the parasitoid wasp Trichogramma minutumon spherical Manduca sextahosts is described. The mean walking speed during host examination was 0.64 ± 0.03 mm s −1 and is independent of wasp size. The paths taken by the wasps are not evenly distributed over the host surface; the majority of time is spent below 45 ° latitude. The distribution of oviposition sites is also nonrandom with respect to latitude and is not influenced by phototaxic and geotaxic responses. The initial transit made by the wasps over the host surface is a straight path which frequently passes across the highest point on the host. The length and duration of the initial transit are independent of wasp body length. However, stride length and stepping rates are proportional to wasp body length, and small wasps take more steps to complete their initial transit. The roles of the examination walk in host recognition and host volume measurement by Trichogrammaare also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053289
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    Paper (German National Licenses)
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  • 19
    Electronic Resource
    Electronic Resource
    Positive interpolation with rational splines (1989)
    Springer
    BIT 29 (1989), S. 140-147 
    Details
    ISSN: 1572-9125
    Keywords: AMS(MOS) 65D07 ; 41A15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A method is presented for the construction of positive rational splines of continuity classC 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01932711
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    Paper (German National Licenses)
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  • 20
    Electronic Resource
    Electronic Resource
    Anatomische und röntgenologische Untersuchungen zur endoskopischen Punktion der großen Körperschlagadern (1955)
    Springer
    European archives of oto-rhino-laryngology and head & neck 168 (1955), S. 101-132 
    Details
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung 1. Mit Hilfe der endoskopischen Punktion gelingt es auf einfache Weise und zuverlässig, die großen Körperschlagadern zu erreichen: durch den Oesophagus den distalen Aortenbogen und die absteigende Aorta, durch den proximalen Abschnitt der Hauptbronchien bzw. durch die Seitenwand der Trachea die Pulmonalarterien; der aufsteigende Anteil des Aortenbogens wird pertracheal punktiert. 2. An Hand anatomischer Präparate werden die typischen Einstichstellen gezeigt. 3. Auf Grund von Punktionsstudien an der Leiche wurden Trefferskizzen angefertigt, welche die günstigsten Positionen zur peroesophagealen und pertrachealen Punktion der Aorta und zur pertrachealen Punktion der Art. pulmonalis und ihrer beiden Hauptäste augenfällig machen. 4. Mit Hilfe der Röntgenuntersuchung läßt sich vor der Punktion bestimmen, an welcher Seite, in welcher Höhe und in welcher Richtung eingestochen werden sollte, um die Aorta, die Art. pulmonalis und den linken Vorhof sicher zu erreichen. 5. Die günstigsten Einstichstellen werden für alle wichtigen Punktionsarten angegeben und hierbei Alter, Geschlecht und Konstitution der Patienten berücksichtigt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02278865
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    Paper (German National Licenses)
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