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  • 1
    Electronic Resource
    Electronic Resource
    Effect of low temperature neutron irradiation on superconducting properties of Nb"3Sn
    Amsterdam : Elsevier
    Physics Letters A 51 (1975), S. 83-84 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(75)90234-0
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  • 2
    Electronic Resource
    Electronic Resource
    Six-year follow-up of titanium and high-gold porcelain-fused-to-metal fixed partial dentures (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In a randomized clinical study 47 titanium and gold-alloy fixed partial dentures (FPDs) were placed during a 1-year period. In the titanium group (n=22) all metal substructures were made of unalloyed titanium. The titanium substructures were fabricated by copy milling, spark erosion and laser welding (Procera®, Nobelpharma). Ceramic veneering was carried out with Duceratin® titanium ceramics (Ducera, Germany). In the control group (n=25) the high-gold alloy Degudent U® (Degussa, Germany) and Vita VMK 68® ceramics (Vita, Germany) were used. The longest observation time was 6 years. Only one FPD had to be removed due to metal–ceramic failure (titanium group). The clinical performance of all 125 porcelain-fused-to-metal (PFM) veneers with respect to the longevity of the metal–ceramic compound was described by Kaplan–Meyer survivor analyses. Relating survival to a completely intact ceramic veneer, the 5-year survivor rate was 84% for titanium and 98% for the high-gold alloy. PFM titanium restorations exhibited a significantly increased risk of metal–ceramic failure. However, concerning defects requiring removal, no significant differences in titanium versus high-gold alloy occurred. There were no significant differences in the survival distributions between crowns and pontics within the two groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00373.x
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  • 3
    Electronic Resource
    Electronic Resource
    Prosthetic treatment need in a representative German sample* (2001)
    Oxford UK : Blackwell Science Ltd
    Journal of oral rehabilitation 28 (2001), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Regarding declining resources epidemiological data on needs for oral rehabilitation are required. Within the framework of an oral health survey a non-stratified two-stage random sample was taken to represent the over 14-year-old population of Saxony/Germany. The participation rate was 55%. Normative need was determined by dental assessment and guidelines developed in a consensus process, subjective prosthetic treatment need by self-complete questionnaire. About 97% of the realized sample could be planned within the guidelines. About 81% had normative prosthetic treatment need. Compared with the rate of normative need the rate of subjective need (13%) was considerably lower (χ2P 〈 0˙01). Different predictive parameters of subjective need were identified by logistic regression. Besides other factors subjective need was associated with giving dentist’s recommendation as significant reason for prosthetic restorations [odds ratio (OR)=5˙43], not believing that the own teeth were all right (OR=0˙17), and the existence of prosthetic restorations (OR=3˙87 for fixed restorations; OR=4˙05 for removable dentures). The guidelines proved their suitability to assess normative prosthetic treatment need in oral health surveys. Further research is necessary to find adequate options for including patients’ preferences in an adequate need definition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2001.00773.x
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  • 4
    Electronic Resource
    Electronic Resource
    Die gegenwärtige Lage der Bisamverbreitung in der Bundesrepublik und die sich daraus ergebenden Aufgaben für den amtlichen Bekämpfungsdienst (1958)
    Springer
    Journal of pest science 31 (1958), S. 113-121 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02284015
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  • 5
    Electronic Resource
    Electronic Resource
    Vögel als Pflanzenschädlinge im Altertum (1976)
    Springer
    Journal of pest science 49 (1976), S. 161-164 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Damages by birds in the antique Damages by birds especially on young or on standing crops are known since the early antique. Cause of the damages were essentially the same species of birds which are also important ennemies of the farmer till to-day: daws, starlings, sparrows, throstles. From greater birds which could be dangerous mainly for the winter-corn are mentioned cranes and wild-geese. To prevent damages mostly the same simple methods were applied which play an important part not only till early modern times but also till to-day. Representations of damages by birds in a real sense are not present; at the most decorative paintings and sculptures permit some conclusions about observations in this direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01984768
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  • 6
    Electronic Resource
    Electronic Resource
    Die Kohler-Regel für den longitudinalen Magnetwiderstand von neutronenbestrahltem Kupfer bei 4,6°K (1970)
    Springer
    The European physical journal 12 (1970), S. 72-80 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Zusammenfassung Wir haben den longitudinalen Magnetwiderstand von reinem ein- und polykristallinem Kupfer nach Tieftemperaturbestrahlung mit schnellen Neutronen und anschließendem stufenweisen Tempern gemessen. Änderungen der Streuanisotropie der Defekte während Bestrahlung und Erholung machen sich in Abweichungen von der Kohler-Regel bemerkbar. Das Ergebnis der Messungen lautet, daß während der Bestrahlung und der Erholungsstufe I vorwiegend dieselbe Streukonfiguration vorhanden ist, die sich dann so verändert, daß nach Stufe III eine neue Konfiguration vorherrscht.
    Abstract: Résumé Nous avons mesuré la magnetorésistivité longitudinale de cuivre pur mono- et polycrystallin après avoir crée à basse température des défauts ponctuels par bombardement neutronique et après des récuits isochrones. Les changements des anisotropies de la diffusion des électrons par ces défauts peuvent être étudiés à partir des déviations de la loi de Kohler. Il résulte de nos mesures que durant l’irradiation et le stage I du recuit la même configuration de diffusion est présente, qu’elle se transforme ensuite et qu’après le stage III une nouvelle configuration prédomine.
    Notes: Abstract We have measured the longitudinal magnetoresistance of pure single- and polycrystalline copper after introducing structural defects at low temperature with fast neutrons and subsequent step-annealing. There are deviations from Kohler’s rule if the scattering anisotropies of the defects change. The result of the measurement is that during irradiation and recovery stage I almost the same scattering configuration is present, which rearranges to another configuration which dominates after stage III.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422905
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  • 7
    Electronic Resource
    Electronic Resource
    The low field Hallcoefficient in cubic metals (1970)
    Springer
    The European physical journal 11 (1970), S. 177-187 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Zusammenfassung Im anisotropen Relaxationszeit-Modell werden mittels der Bahnkurven-Methode einige nützliche Formeln für den Niedrigfeld-Hallkoeffizient in kubischen Metallen abgeleitet. Die Ergebnisse sind schon aus der Literatur bekannt, aber für die einen wurde die Ableitung nicht veröffentlicht (Rasmussen et al.) und die anderen wurden mittels anderer Methoden (Tsuji) und unter vereinfachenden Annahmen (Tsuji, Ziman) abgeleitet. Deshalb beweisen die Ergebnisse die Konsistenz der einzelnen Formeln und ihre einheitliche Ableitung veranschaulicht die zugrundeliegenden physikalischen Vorgänge. Die Ergebnisse werden diskutiert und auf die Kohlerregel bezogen.
    Abstract: Résumé Dans le modèle du temps de relaxation anisotrope quelques formules utiles pour le coefficient de Hall à champ faible sont derivées pour les métaux cubiques à l'aide de la méthode de trajectoire. Les résultats sont déjà connus par la littérature, mais dans une partie des cas la dérivation ne fut pas publiée (Rasmussen et al.), tandis que les autres formules furent obtenues à l'aide d'autres méthodes (Tsuji) et sous l'admission d'hypothèses simplifiantes (Tsuji, Ziman). C'est la raison pour laquelle les résultats prouvent la consistance des différentes formules et leur dérivation uniforme illustre les faits physiques qui en sont la cause. Les résultats sont discutés et mis en rapport avec la règle de Kohler.
    Notes: Abstract In the anisotropic relaxation time model the trajectory method is used to derive some useful formulae for the low field Hallcoefficient in cubic metals. The results are already known from the literature, but for one part of them a derivation has not been published (Rasmussenet al.) and the other part was derived with different methods (Tsuji) and under simplifying assumptions (Tsuji, Ziman). So the results prove the consistency of the various formulae and their uniform derivation illustrates the underlying physical processes. The results are discussed and connected with the Kohler rule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422484
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  • 8
    Electronic Resource
    Electronic Resource
    4 OPW calculations of electronic transport coefficients of aluminium containing point defects (1979)
    Springer
    The European physical journal 32 (1979), S. 287-300 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The scattering of conduction electrons on dilute point defects in aluminium was investigated, for zero temperature, by pseudopotential calculations considering the realistic form of the Al Fermi surface (FS) and band structure. The 4-OPW wavefunctions, band velocities and FS curvatures were calculated for 1,300 pointsk on 1/48 (cubic symmetry element) of the FS. The scattering potentials were obtained as follows: for the impurities Ge, Mg, Zn, and Ga tabulated pseudopotentials were used and rescreened for the electron density of Al, the vacancy was treated as a missing Al atom and the [100] dumbbell interstitial as two Al atoms with a vacancy in between (always with strain field corrections). The scattering matrixP kk′ was obtained in first order Born approximation. The linearized Boltzmann equation was solved numerically by iteration, for zero magnetic field and for a reduced set of 109 points on 1/48 FS, to yield the anisotropic transport relaxation timesτ k and lifetimesτ k 0 . Theτ k were interpolated for the 1,300 points again and inserted into low-field FS integrals for the galvanomagnetic coefficients which depend sensitively on the details of the FS and the anisotropy ofτ k . Without any free parameter, our results agree very well with experimental data for the case of Ge, Mg, and Zn impurities, and less so for the homovalent Ga impurities and for the self-defects. The diffusion thermopower was also calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01351506
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical half-lives for the heaviest nuclei (1986)
    Springer
    The European physical journal 325 (1986), S. 479-484 
    Details
    ISSN: 1434-601X
    Keywords: 28.85.Ca ; 23.60.+e ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spontaneous-fission and alpha-decay half-lives are calculated for even-even nuclei with the atomic numberZ=104–110. The results reproduce rather well the existing experimental data for these nuclei and predict rather large total lifetimes for nuclei even heavier than observed up to now. The latter is mainly due to a deformed shell at the neutron numberN=162–164, obtained in calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290052
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  • 10
    Electronic Resource
    Electronic Resource
    The low-field galvanomagnetic transport coefficients of cubic metals: General formulae and experiments on the hall coefficient in Al(Ge) (1979)
    Springer
    The European physical journal 34 (1979), S. 243-254 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The scattering of conduction electrons by defects is described by a low-field transport relaxation timeτ k x . It depends on the electron wavevectork and on the direction of the electric fieldE/E, but not on the magnetic fieldH. From a discussion of Kohler's rule written in terms of the exact relaxation timeτ k * it follows that this approximation is very good for low values ofH/ρ, withρ being the resistivity forH=0. Assumingτ k x to be known, the linearized Boltzmann equation is solved by a Jones-Zener expansion up to termsH 3. For metals with cubic symmetry we derive simple formulae for the coefficients of transverse and longitudinal magnetoresistance and for the two leading terms of the Hall coefficientR(H)=R 0+R 2(H/ρ)2. Simplifications occur for aτ k with cubic symmetry and for metals with special Fermi surfaces. These formulae are used to interpret experimental results of the magnetic field dependence ofR(H) in Al(Ge) at 4 K. In this dilute aluminium alloyR 0 is highly positive andR 2 strongly negative. By irradiating a 3,000 ppm Al(Ge) sample with reactor neutrons at 4 K, an increasing concentration of self-interstitials and vacancies is added to the germanium impurities resulting in a decrease of bothR 0 and |R 2|. This is discussed in a three-group model of the Fermi surface of aluminium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325618
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