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  • Articles: DFG German National Licenses  (6)
  • 1990-1994  (6)
  • 1940-1944
  • 1993  (6)
  • 1
    Electronic Resource
    Electronic Resource
    One-stage transverse preputial island flap in the management of maldeveloped short urethra (1993)
    Springer
    Pediatric surgery international 8 (1993), S. 371-372 
    Details
    ISSN: 1437-9813
    Keywords: Chordee without hypospadias ; True short urethra ; Urethral malformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Chordee without hypospadias is found in a small number of patients. Surgical treatment differs according to the length of the urethra. Sometimes a maldeveloped short urethra requires transection to achieve good straightening of the penis. The authors present two such patients in whom a transverse preputial island-flap, as described by Duckett for the treatment of hypospadias, was used with good results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173372
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Parameterization of a momentum source in a tropical cumulus ensemble (1993)
    Springer
    Meteorology and atmospheric physics 52 (1993), S. 153-167 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary An eddy effect of tropical deep convection on the large-scale momentum, resp vorticity budget is investigated. The process is specified by a simple parameterization approach which is based on a concept of rotating clouds exerting a momentum on the large-scale flow. The cloud rotation is associated with the thermal properties of a cloud ensemble by the principle of conservation of potential vorticity. A decomposition of cloud classes is applied in consistency with the thermodynamical parameterization scheme of Arakawa and Schubert (1974). The parameterization is tested with observations of GATE74, Phase III. The data are processed on a B/C-scale grid (55km) in a region within 9N and 16N, and between 21W and 27W, and with a vertical resolution of 41 levels. The parameterization results correspond to the observed patterns, especially in situations with strong large-scale wind shear. The findings suggest that certain large-scalle flow regimes provoke convective scale momentum generation rather than redistributing large-scale momentum by convective circulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01031874
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Species discrimination in five species of winter-flying geometrids (Lepidoptera) based on chirality of semiochemicals and flight season (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2721-2735 
    Details
    ISSN: 1573-1561
    Keywords: Chirality ; enantiomers ; sex pheromones ; (3Z,9Z)-(6R,7S)-epoxynonadecadiene ; (3Z,9Z)-(6S,7R)-epoxynonadecadiene ; (6Z,9Z)-(3S,4R)-epoxynonadecadiene ; Colotois pennaria ; Erannis defoliaria ; Agriopis aurantiaria ; A. marginaria ; A. leucophearia ; Lepidoptera ; Geometridae ; electroantennogram ; field trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Enantiomer separation of (6Z,9Z)-cis-3,4-epoxynonadecadiene and (3Z,9Z)-cis-6,7-epoxynonadecadiene could be achieved using chiral high-resolution gas chromatography and a cyclodextrin-bond column. (3Z,9Z)-(6R,7S)-Epoxynonadecadiene was identified from ovipositor extracts ofColotois pen-Naria, while inErannis defoliaria the 6S,7R-enantiomer was found. In field trapping tests pure synthetic enantiomers caught only conspecific males of these species. (3Z,6Z,9Z)-Nonadecatriene was found in both species, while the presence of (3Z,6Z,9Z)-heneicosatriene was indicated inC. Pennaria only. A 10∶10∶3 blend of (3Z,9Z)-(6R,7S)-epoxynonadecadiene, (3Z,6Z,9Z)-heneicosatriene, and (3Z,6Z,9Z)-nonadecatriene was found to be optimal for catchingC. Pennaria, whileE. Defoliaria males were optimally caught by a 1∶1 mixture of (3Z,9Z)-(6S,7R)-epoxynonadecadiene and (3Z,6Z,9Z)-nona-decatriene. (6Z,9Z)-(3S,4R)-Epoxynonadecadiene was identified from ovipositor extracts ofAgriopis (Erannis) aurantiaria. In field tests the pure enantiomer proved to be a highly specific sex attractant for both the late autumn/early winter flyingA. Aurantiaria and the late winter/early spring flyingA. Leucophearia. Males ofAgriopis marginaria, which fly in late winter/early spring, were attracted to (3Z,9Z)-(6S,7R)-epoxynonadecadiene. The addition of (3Z,6Z,9Z)-nonadecatriene to theS,R-enantiomer increased captures. Optimal catches were recorded with a 10∶3 epoxide-hydrocarbon blend. Enantiomer specificity in all species was confirmed in EAG measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980703
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Investigations of correlated ρ+ e− emission in heavy-ion collisions near the Coulomb barrier (1993)
    Springer
    The European physical journal 346 (1993), S. 153-168 
    Details
    ISSN: 1434-601X
    Keywords: 14.60.Cd ; 25.70.Cd ; 25.70.Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the results obtained from a series of ρ+ρ−-coincidence measurements in heavy-ion collisions using the double-Orangeβ-spectrometer at GSI. The collision systems U+U, U+Pb, and U+Ta were investigated at bombarding energies close to and slightly above (U+Ta) the Coulomb barrier. For all systems studied, very narrow (FWHM−20 keV) ρ+ρ− lines were observed in the sum-energy spectra, with kinetic energies ranging from ∼555 keV to ∼810 keV, superimposed on a continuous distribution mainly due to uncorrelated ρ+ρ− emission. Particularly in the U+Ta system, a pronounced sum-energy line appears at ∼634 keV, predominantly in deep-inelastic collisions. In some cases (e.g. U+Pb) the line characteristics is consistent with a two-body decay mode of an emitter which moves with the c.m. velocity of the colliding ions. However, other lines, and in particular the 634 keV line (U+Ta), exhibit a rather isotropical opening-angle distribution whereas their energy is unequally shared between positrons and electrons, thus being in clear disagreement with this scenario. In general, the data preclude an emission from the separated (moving) nuclei, and, in the latter cases, provide evidence that the e+e−-pair decay occurs in the vicinity of the Coulomb field of a third heavy (positively charged) partner having only a small transverse velocity (|v|⊥〈0.02c)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294631
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Arc-PVD-Beschichtung von Hartmetallen und Analyse des funktionellen Verhaltens beim Zerspanen im unterbrochenen Schnitt (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 131-141 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Arc-PVD-Coating of Cemented Carbides and Analysis of their Functional Behaviour in Interrupted Cut MachiningInterrupted machining of quenched and tempered steel demands the application of tools with high resistance against mechanically and tribologically induced wear. These demands can not be fully satisfied by uncoated carbides. Also CVD-coatings give only some improvement due to a certain embrittlement of the substrate during the coating process. PVD-coatings deposited at low temperatures without affection of the substrate lower the influence of the relevant wear mechanisms preferably at moderate cutting speeds.The combination of tough substrates with structural and compositional optimized coatings results in a multiplication of tool life within the whole range of low and medium cutting speeds. Coatings with homogenious structure, compressive residual stresses and high content of metalloides ensure excellent resistance against wear.Titanium-carbonitride deposited on carbide was found to be superiour compared with other carbonitride, nitride and carbide coatings within the system Ti—Zr—C—N due to excellent tribological properties. It was optimal suited for the interrupted cut application.
    Notes: Die Zerspanung von höherfesten Stahlwerkstoffen in unterbrochenen Schnitten stellt an die Werkzeuge hohe mechanische und tribologische Anforderungen, denen unbeschichtete Hartmetalle in vielen Fällen nicht gerecht werden können. Während sich bei der Zerspanung von höherfestem Stahl in stark unterbrochenen Schnitten durch die CVD-Beschichtung von Hartmetallen auf-grund prozeßbedingter Versprödungseffekte kaum Leistungssteigerungen erzielen lassen, können PVD-Hartstoffbeschichtungen, die bei substratschonend niedrigen Prozeßtemperaturen abgeschieden werden, dem Auftreten der relevanten Schädigungsmechanismen besonders bei niedrigen und mittleren Schnittgeschwindigkeiten entscheidend entgegenwirken.Insbesondere mit zähen Substratsorten sowie mit strukturell und kompositionell optimierten Schichten können Standzeitvervielfachungen im gesamten unteren und mittleren Schnittgeschwindigkeitsbereich erzielt werden. Homogene Schichtstrukturen, hohe Druckeigenspannungen und hohe Metalloidgehalte der Hartstoff-schichten gewährleisten eine hohe Verschleißfestigkeit. Titankarbonitrid zeichnet sich auf Hartmetallen gegenüber anderen karbonitridischen, nitridischen und karbidischen Schichten des Systems Ti—Zr—C—N durch ein besonders günstiges tribologisches Verhalten aus und hat sich als optimaler Beschichtungswerkstoff für unterbrochene Schnitte erwiesen.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240312
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Collection of enantiomeric separation factors obtained by capillary gas chromatography on chiral stationary phasesSee page 338 in the June 1993 issue of this Journal for the previous contribution in this series. (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 569-586 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240161003
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    Paper (German National Licenses)
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