@article{HoevelFritzHilgeretal.1993, author = {H{\"o}vel, H. and Fritz, S. and Hilger, A. and Kreibig, U. and Vollmer, Michael}, title = {Width of cluster plasmon resonances: Bulk dielectric functions and chemical interface damping}, series = {In: Phys. Rev. B 48 (1993) 24, 18178-18188}, journal = {In: Phys. Rev. B 48 (1993) 24, 18178-18188}, doi = {10.1103/PhysRevB.48.18178}, year = {1993}, abstract = {The damping of collective electron resonances in clusters which develop into plasmon polaritons at larger sizes is investigated for free, supported, and embedded neutral metal clusters. Embedding of free 2 nm Ag clusters of 2-nm diameter into a SiO2 matrix leads to an increase of the width of the resonances by more than a factor of 3. The optical spectra are compared with the Mie theory using size-effect-modified dielectric functions of the solid state. The results corroborate the assumption that the widths of the resonances strongly depend on chemical interface effects. The results are briefly discussed with regard to limited-mean-free-path and quantum-size-effect theories and a recent approach by Persson. It is demonstrated that the widths of the spectra of supported and embedded clusters have to be interpreted with care since true intrinsic size effects of the clusters appear to be less effective than previously believed and can be obscured by the chemical interface damping. © 1993 The American Physical Society}, language = {en} } @article{GoetzTraegerVollmer1993, author = {G{\"o}tz, T. and Tr{\"a}ger, F. and Vollmer, Michael}, title = {Desorption of metal atoms with laser light of different polarization}, series = {In: Applied physics / A 57 (1993) 1, pp 101-104}, journal = {In: Applied physics / A 57 (1993) 1, pp 101-104}, doi = {10.1007/BF00331225}, pages = {101 -- 104}, year = {1993}, abstract = {Laser-induced desorption of metal atoms from the surface of small metal particles has been investigated as a function of the shape of the particles and the polarization of the incident laser light. The particles were supported on LiF, quartz or sapphire substrates. In a first set of experiments, the shape of the particles was determined by recording optical transmission spectra with s- and p-polarized light incident under an angle of typically 40° with respect to the surface normal. The metal particles turn out to be oblate, the ratio of the axes perpendicular and parallel to the substrate surface being on the order of 0.5. This ratio decreases with increasing particle size. Also, the particles change shape if the temperature is raised. In further experiments, s- and p-polarized light has been used to stimulate desorption of atoms via surface plasmon excitation. It is found that the desorption rate markedly depends on the polarization of the light. This is explained by excitation of the collective electron oscillation along different axes of the non-spherical particles.}, language = {en} } @article{HoheiselVollmerTraeger1993, author = {Hoheisel, W. and Vollmer, Michael and Tr{\"a}ger, F.}, title = {Desorption of metal atoms with laser light: Mechanistic studies}, series = {In: Physical Review / B 48 1993) 23, 17463-17476}, journal = {In: Physical Review / B 48 1993) 23, 17463-17476}, doi = {10.1103/PhysRevB.48.17463}, year = {1993}, abstract = {Results on laser-induced desorption of metal atoms from small metal particles are presented. Experiments have been performed on sodium, potassium, and silver particles supported on a LiF(100) single-crystal surface under ultrahigh vacuum conditions. Measurements include the determination of the desorption rate as a function of laser wavelength, laser intensity, average particle size, and substrate temperature, the determination of the kinetic energy of the desorbed atoms, the investigation of the optical spectra of the supported metal particles, and the study of the influence of adsorbate molecules on the desorption rate. Furthermore, theoretical extinction and absorption spectra of the metal particles have been calculated with the classical electrodynamical Mie theory as a function of average particle size and excitation wavelength. Also, the radial electric field at the particle surface was computed. The results of the experiments and theoretical calculations are combined to give a consistent picture of the mechanism of metal-atom desorption by electronic excitation with laser light. A realistic surface potential from which the atoms escape and nonlocal optical effects are taken into account. The latter introduce additional absorption channels by the formation of electron-hole pairs in the surface layer of the particle which relax into antibonding states before desorption occurs. Finally, the mechanism is discussed in the light of similar phenomena observed for thin metal films. Possibilities for future work are outlined. © 1993 The American Physical Society}, language = {en} } @article{GoetzHoheiselTraegeretal.1993, author = {G{\"o}tz, T. and Hoheisel, W. and Tr{\"a}ger, F. and Vollmer, Michael}, title = {Interplay between collective and single electron excitations in large metal clusters}, series = {In: Zeitschrift f{\"u}r Physik / D 26 (1993), 267-269}, journal = {In: Zeitschrift f{\"u}r Physik / D 26 (1993), 267-269}, year = {1993}, language = {en} } @article{HoheiselVollmerTraeger1993, author = {Hoheisel, W. and Vollmer, Michael and Tr{\"a}ger, F.}, title = {Laserdesorption von Metallatomen}, series = {In: Physikalische Bl{\"a}tter 49 (1993) 9, 795 - 799}, journal = {In: Physikalische Bl{\"a}tter 49 (1993) 9, 795 - 799}, doi = {10.1002/phbl.19930490909}, year = {1993}, abstract = {Beleuchtet man die Oberfl{\"a}che eines Festk{\"o}rpers mit Laserlicht, k{\"o}nnen darauf adsorbierte Atome oder Molek{\"u}le abgel{\"o}st werden. Solche Desorptionsprozesse sind in j{\"u}ngster Zeit in zahlreichen Experimenten untersucht worden, wobei sich das Interesse sowohl auf die Erforschung der zugrundeliegenden Mechanismen als auch auf m{\"o}gliche Anwendungen dieser Reaktionen, zum Beispiel zur gezielten Modifizierung von Oberfl{\"a}chen, konzentriert. Besonders interessant ist das laserinduzierte Aufbrechen von Bindungen zur Oberfl{\"a}che dann, wenn es nicht einfach als thermischer Prozeß durch eine Temperaturerh{\"o}hung hervorgerufen wird, sondern direkt auf einer elektronischen Anregung beruht. Solche nichtthermischen Prozesse werden selbst f{\"u}r Metalle beobachtet, obwohl die Kopplung der elektronischen Anregung an das Substrat hier besonders schnell abl{\"a}uft. Der zugrundeliegende Mechanismus beruht auf dem Zusammenspiel einer kollektiven Elektronenoszillation und einer lokalisierten Einzelelektronenanregung, wobei auch nichtlokale optische Effekte in der Metalloberfl{\"a}che eine wichtige Rolle spielen.}, language = {de} } @inproceedings{Edel1993, author = {Edel, Karl-Otto}, title = {Fracture Mechanics Analysis of the Residual Service Life of the Welded Main Girders of the Highway Bridges of Ruedersdorf}, series = {In: Fatigue design : papers presented at the International Symposium on Fatigue Design / organized and sponsored by VTT (Technical Research Centre of Finland) and held in Helsinki, Finland. Co-sponsored by the European Structural Integrity Society (ESIS) and the Technology Development Centre of Finland (TEKES). Ed. by J Solin ... - London : Mechanical Engineering Publ., 1993. - (ESIS publication // European Structural Integrity Society, ISSN 1566-1369 ; 16). - ISBN 0-85298-884-2}, booktitle = {In: Fatigue design : papers presented at the International Symposium on Fatigue Design / organized and sponsored by VTT (Technical Research Centre of Finland) and held in Helsinki, Finland. Co-sponsored by the European Structural Integrity Society (ESIS) and the Technology Development Centre of Finland (TEKES). Ed. by J Solin ... - London : Mechanical Engineering Publ., 1993. - (ESIS publication // European Structural Integrity Society, ISSN 1566-1369 ; 16). - ISBN 0-85298-884-2}, pages = {109 -- 120}, year = {1993}, language = {en} } @article{HerrmanAuthMoellmannetal.1993, author = {Herrman, K. H. and Auth, J. and M{\"o}llmann, Klaus Peter and Tomm, J. W. and Bottner, H. and Lambrecht, A. and Tacke, M. and Kolesnikov, V. and Yunovich, A. E. and Fedorenko, A. I. and Mironov, O. A. and Sipatov, A. Yu}, title = {Band offsets in Eu-containing lead chalcogenides and lead chalcogenide superlattices from spectroscopic data}, series = {In: Semiconductor Science and Technology Vol. 8 (1993) 1S, pp S176-S179}, journal = {In: Semiconductor Science and Technology Vol. 8 (1993) 1S, pp S176-S179}, issn = {1361-6641}, doi = {10.1088/0268-1242/8/1S/040}, pages = {S176 -- S179}, year = {1993}, abstract = {The results of an experimental study of the optical and photoelectrical properties of Eu-containing lead chalcogenides and superlattices are presented. From both sets of experiments band offset data for the lead chalcogenide-europium chalcogenide heterojunction are derived. The results are compared with the data obtained from a linear interpolation of the band structures between those of the binaries.}, language = {en} } @inproceedings{Edel1993, author = {Edel, Karl-Otto}, title = {Mit Rissen leben? : Zur Betriebssicherheit rissgesch{\"a}digter Bauteile; ein Vortrag, gehalten am 14. April 1993 in der FH Brandenburg}, publisher = {Fachhochsch. Presse- und {\"O}ffentlichtkeitsarbeit}, address = {Brandenburg}, pages = {69 S.}, year = {1993}, subject = {Bauwerk}, language = {de} } @article{Edel1993, author = {Edel, Karl-Otto}, title = {Bruchmechanische Analyse und Bewertung der Rißausbreitung im Radkranz von Eisenbahnvollr{\"a}dern. Teil 1}, series = {In: Zeitschrift f{\"u}r Eisenbahnwesen und Verkehrstechnik : ZEV + DET 117 (1993) 8, 262-268}, journal = {In: Zeitschrift f{\"u}r Eisenbahnwesen und Verkehrstechnik : ZEV + DET 117 (1993) 8, 262-268}, issn = {0373-322X - 0941-0589}, pages = {262 -- 268}, year = {1993}, language = {de} } @article{Edel1993, author = {Edel, Karl-Otto}, title = {Bruchmechanische Analyse und Bewertung der Rißausbreitung im Radkranz von Eisenbahnvollr{\"a}dern. Teil 2}, series = {In: Zeitschrift f{\"u}r Eisenbahnwesen und Verkehrstechnik : ZEV + DET 117 (1993) 9, 308-315}, journal = {In: Zeitschrift f{\"u}r Eisenbahnwesen und Verkehrstechnik : ZEV + DET 117 (1993) 9, 308-315}, issn = {0373-322X - 0941-0589}, pages = {308 -- 315}, year = {1993}, language = {de} } @inproceedings{Brasche1993, author = {Brasche, Ulrich}, title = {Sind Produktinnovationen mit mehrheitlich {\"a}lteren Arbeitnehmern m{\"o}glich?}, series = {In: Alter und Erwerbsarbeit der Zukunft : Arbeit und Technik bei ver{\"a}nderten Alters- und Belegschaftsstrukturen; Kongreß vom 3. und 4. November 1992 in Berlin / [hrsg. f{\"u}r die Deutsche Forschungsanstalt f{\"u}r Luft- und Raumfahrt, Projekttr{\"a}ger "Arbeit und Technik"]. H.-J. Bullinger ... (Hrsg.). - Berlin [u.a.] : Springer, 1993. - ISBN 3-540-56836-0}, booktitle = {In: Alter und Erwerbsarbeit der Zukunft : Arbeit und Technik bei ver{\"a}nderten Alters- und Belegschaftsstrukturen; Kongreß vom 3. und 4. November 1992 in Berlin / [hrsg. f{\"u}r die Deutsche Forschungsanstalt f{\"u}r Luft- und Raumfahrt, Projekttr{\"a}ger "Arbeit und Technik"]. H.-J. Bullinger ... (Hrsg.). - Berlin [u.a.] : Springer, 1993. - ISBN 3-540-56836-0}, pages = {150 -- 155}, year = {1993}, language = {de} } @article{Socolowsky1993, author = {Socolowsky, J{\"u}rgen}, title = {The solvability of a free boundary problem for the stationary Navier-Stokes equations with a dynamic contact line}, series = {In: Nonlinear Analysis: Theory, Methods \& Applications 21 (1993) 10, 763-784}, journal = {In: Nonlinear Analysis: Theory, Methods \& Applications 21 (1993) 10, 763-784}, pages = {763 -- 784}, year = {1993}, language = {en} } @techreport{BarthelKindsmuellerSchmidetal.1993, author = {Barthel, S. and Kindsm{\"u}ller, Martin Christof and Schmid, U. and Sch{\"o}nig, S.}, title = {Das FlieWaTau-DB - Ein Expertensystem zur Unterst{\"u}tzung von Wohnraumtausch mit Kopplung an ein Datenbanksystem}, year = {1993}, language = {de} } @misc{Kindsmueller1993, author = {Kindsm{\"u}ller, Martin Christof}, title = {Testing the limits of LCSI MicroWorlds Logo 1.00: Developing an electronic book about the solar system}, year = {1993}, language = {en} } @inproceedings{SchneiderPreussNielsen1993, author = {Schneider, J. M. and Preuss, Thomas and Nielsen, P. S.}, title = {Management of virtual private networks for integrated broadband communication}, series = {SIGCOMM '93 : Conference proceedings ; communications, architectures, protocols and applications, September 13 - 17, 1993, San Francisco, California, USA}, booktitle = {SIGCOMM '93 : Conference proceedings ; communications, architectures, protocols and applications, September 13 - 17, 1993, San Francisco, California, USA}, publisher = {ACM}, address = {New York}, isbn = {0-89791-619-0}, doi = {10.1145/166237.166259}, pages = {224 -- 237}, year = {1993}, language = {en} } @article{StumpfFauserPfister1993, author = {Stumpf, H. and Fauser, B. and Pfister, Winfried}, title = {Composite Particle Theory in Quantum Electrodynamics}, series = {Zeitschrift f{\"u}r Naturforschung / A}, volume = {48}, journal = {Zeitschrift f{\"u}r Naturforschung / A}, number = {7}, issn = {1865-7109 (online)}, pages = {765 -- 776}, year = {1993}, language = {en} } @article{Pfister1993, author = {Pfister, Winfried}, title = {On the theory of composite gauge bosons: Calculation of coupling constants and covariant derivatives}, series = {Il nuovo cimento / A}, volume = {106}, journal = {Il nuovo cimento / A}, number = {3}, issn = {1826-9869 (online)}, doi = {10.1007/BF02771452}, pages = {363 -- 377}, year = {1993}, language = {en} } @article{BunikowskiFitzekTrautmann1993, author = {Bunikowski, R. and Fitzek, Clemens and Trautmann, M.}, title = {Epidemiologic and clinical aspects of HIV infection in homosexual patients and intravenous drug addicts in a comparative study}, series = {Gesundheitswesen}, volume = {55}, journal = {Gesundheitswesen}, number = {1}, issn = {0941-3790 (Print)}, pages = {28 -- 32}, year = {1993}, language = {en} } @incollection{Muendemann1993, author = {M{\"u}ndemann, Friedhelm}, title = {Fuzzy concepts for predicting the behaviour of other drivers on a highway}, series = {Fuzzy Logic in Artificial Intelligence Lecture Notes in Computer Science}, booktitle = {Fuzzy Logic in Artificial Intelligence Lecture Notes in Computer Science}, publisher = {Springer Verlag}, address = {Berlin Heidelberg}, doi = {10.1007/3-540-56920-0_18}, pages = {165 -- 173}, year = {1993}, language = {en} } @book{Heinsohn1994, author = {Heinsohn, Jochen}, title = {ALCP : ein hybrider Ansatz zur Modellierung von Unsicherheit in terminologischen Logiken}, series = {Dissertationen zur k{\"u}nstlichen Intelligenz ; 55.}, journal = {Dissertationen zur k{\"u}nstlichen Intelligenz ; 55.}, publisher = {Infix}, address = {Sankt Augustin}, isbn = {3-929037-55-6}, pages = {X, 222 S.}, year = {1994}, subject = {Terminologische Sprache}, language = {de} }