@incollection{Alt1971,
  author    = {Alt, Helmut},
  title     = {Fußball oder Mathematik},
  series = {Alma Mater Aquensis : Jahresbericht},
  booktitle = {Alma Mater Aquensis : Jahresbericht},
  pages     = {110 -- 114},
  year      = {1971},
  language  = {de}
}
@incollection{HelsperFissanFranzen1978,
  author    = {Helsper, Christoph and Fissan, H. J. and Franzen, H.},
  title     = {Particle Size Distributions of Combustion Aerosols},
  series = {Atmospheric Pollution 1978 : Proceedings of the 13th International Colloquium; 25-28 April 1978; Paris, France; Edited by Michel M. Benarie},
  booktitle = {Atmospheric Pollution 1978 : Proceedings of the 13th International Colloquium; 25-28 April 1978; Paris, France; Edited by Michel M. Benarie},
  editor    = {Benarie, Michel M.},
  publisher = {Elsevier},
  address   = {Amsterdam},
  isbn      = {0-444-41691-9},
  doi       = {10.1016/S0166-1116(08)71583-8},
  pages     = {263 -- 266},
  year      = {1978},
  abstract  = {It has been observed that carcinogenic polycyclic aromatic hydrocarbons (PAH) are present in the atmosphere. Combustion processes are considered the most important sources for PAH. Among these, the burning of coal produces the highest emission, but in cities with high traffic density and low meteorological exchange activities, vehicle emissions determine the immission situation, especially in narrow streets. For estimating the potential health effects caused by PAH, it is sufficient to characterize the emission of PAH with respect to their physical state, concentrations, and, as far as the particulate phase is concerned, size distribution. The size distribution is important for transport phenomena, inhalation, and deposition in the respiratory tract. These parameters mainly depend on the combustion system, on system operating conditions, on the exhaust system, and on exhaust cooling conditions. At exhaust-gas temperatures in the range of ambient air temperatures, almost the whole emission of PAH is made up of particulate matter.},
  language  = {en}
}
@incollection{HirschWahle1978,
  author    = {Hirsch, G. and Wahle, Michael},
  title     = {Auslegungskriterien f{\"u}r Dynamische Schwingungsd{\"a}mpfer f{\"u}r schwach ged{\"a}mpfte elastische Strukturen unter Ber{\"u}cksichtigung einer der Masseverteilung nicht proportionalen Zusatzd{\"a}mpfung},
  series = {Hans Ebner : Ged{\"a}chtnis-Kolloquium am 27./28. Oktober 1977 in Aachen. - (Mitteilung aus dem Institut f{\"u}r Leichtbau, Aachen ; 1)},
  booktitle = {Hans Ebner : Ged{\"a}chtnis-Kolloquium am 27./28. Oktober 1977 in Aachen. - (Mitteilung aus dem Institut f{\"u}r Leichtbau, Aachen ; 1)},
  address   = {Aachen},
  pages     = {374 -- 400},
  year      = {1978},
  language  = {de}
}
@incollection{CresserHaegerLeuchsetal.1982,
  author    = {Cresser, J. D. and H{\"a}ger, J. and Leuchs, G. and Rateike, Franz-Matthias and Walther, H.},
  title     = {Resonance fluorescence of atoms in strong monochromatic laser fields},
  series = {Dissipative systems in quantum optics. Ed. by Rodolfo Bonifacio. Topics in current physics. Vol. 27},
  booktitle = {Dissipative systems in quantum optics. Ed. by Rodolfo Bonifacio. Topics in current physics. Vol. 27},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-642-81719-9},
  doi       = {10.1007/978-3-642-81717-5_3},
  pages     = {21 -- 59},
  year      = {1982},
  abstract  = {The investigation of atomic resonance fluorescence has always been of special interest as a means for the determination of atomic parameters. In addition, information on the interaction mechanism between atoms and radiation can be obtained. In the standard fluorescence experiment the frequency distribution of the incident photons is larger than the natural width of the respective transition; as a consequence the correlation time in the photon-atom interaction is determined by the lifetime of the atoms in the excited state. With the development of lasers and especially of tunable dye lasers in recent years it became possible to study the case where the incident radiation has a spectral distribution which is narrower than the natural width. This corresponds to a correlation time of the incoming light wave which is much longer than the excited-state lifetime. In this chapter a survey of experiments on the resonance fluorescence of atoms in monochromatic laser fields will be given.},
  language  = {en}
}
@incollection{Alt1983,
  author    = {Alt, Helmut},
  title     = {Analog anzeigende Digitaluhr},
  series = {FH-Texte ; 36 : Berichte aus dem Fachbereich Elektrotechnik Aachen},
  booktitle = {FH-Texte ; 36 : Berichte aus dem Fachbereich Elektrotechnik Aachen},
  publisher = {Fachhochschule Aachen},
  address   = {Aachen},
  pages     = {98 -- 104},
  year      = {1983},
  language  = {de}
}
@incollection{DoerenWernicke1985,
  author    = {D{\"o}ren, Horst-Peter and Wernicke, K.},
  title     = {Einfluß der Schweißparameter beim Plasmaauftragschweißen mit Pulvern},
  series = {Schweißen und Schneiden '85 = Welding and Cutting '85. Vortr{\"a}ge der Großen Schweißtechnischen Tagung in Essen vom 11. bis 13. September 1985. Veranst.: Deutscher Verband f{\"u}r Schweißtechnik (DVS). DVS-Berichte. 100},
  booktitle = {Schweißen und Schneiden '85 = Welding and Cutting '85. Vortr{\"a}ge der Großen Schweißtechnischen Tagung in Essen vom 11. bis 13. September 1985. Veranst.: Deutscher Verband f{\"u}r Schweißtechnik (DVS). DVS-Berichte. 100},
  publisher = {Dt. Verl. f{\"u}r Schweißtechnik (DVS)},
  address   = {D{\"u}sseldorf},
  isbn      = {3-87155-405-7},
  pages     = {72 -- 76},
  year      = {1985},
  language  = {de}
}
@incollection{DoerenPlaschkaPohl1987,
  author    = {D{\"o}ren, Horst-Peter and Plaschka, K. and Pohl, M.},
  title     = {Die Untersuchung von Schutzgasschweißdr{\"a}hten mit Hilfe des Rasterelektronenmikroskops},
  series = {Fortschritte in der Metallographie. Berichte der 7. Internationalen Metallographie-Tagung Leoben 15. bis 17. Oktober 1986. Sonderb{\"a}nde der Praktischen Metallographie. 18},
  booktitle = {Fortschritte in der Metallographie. Berichte der 7. Internationalen Metallographie-Tagung Leoben 15. bis 17. Oktober 1986. Sonderb{\"a}nde der Praktischen Metallographie. 18},
  publisher = {Riederer},
  address   = {Stuttgart},
  issn      = {0343-3579},
  pages     = {333 -- 345},
  year      = {1987},
  language  = {de}
}
@incollection{Doeren1987,
  author    = {D{\"o}ren, Horst-Peter},
  title     = {Nichtrostende St{\"a}hle},
  series = {Jahrbuch Schweißtechnik. 1988},
  booktitle = {Jahrbuch Schweißtechnik. 1988},
  publisher = {Dt. Verl. f{\"u}r Schweißtechnik (DVS)},
  address   = {D{\"u}sseldorf},
  isbn      = {0935-0292},
  pages     = {188 -- 203},
  year      = {1987},
  language  = {de}
}
@incollection{MertensBecker1989,
  author    = {Mertens, Josef and Becker, K.},
  title     = {Numerical solution of flow equations : an aircraft designer's view},
  series = {Nonlinear hyperbolic equations - theory, computation methods, and applications : proceedings of the 2nd International Conference on Nonlinear Hyperbolic Problems, Aachen, FRG, March 14 to 18, 1988. - (Notes on Numerical Fluid Mechanics ; 24)},
  booktitle = {Nonlinear hyperbolic equations - theory, computation methods, and applications : proceedings of the 2nd International Conference on Nonlinear Hyperbolic Problems, Aachen, FRG, March 14 to 18, 1988. - (Notes on Numerical Fluid Mechanics ; 24)},
  editor    = {Ballmann, Josef},
  publisher = {Vieweg},
  address   = {Braunschweig},
  isbn      = {3-528-08098-1},
  doi       = {10.1007/978-3-322-87869-4_41},
  pages     = {403 -- 412},
  year      = {1989},
  abstract  = {Today the most accurate and cost effective industrial codes used in aircraft design are based on the full potential equation coupled with boundary layer equations. However, these are not capable to solve complicated three-dimensional problems of vortical flows and shocks. On the other hand Euler and Navier-Stokes codes are too expensive and not accurate enough for design purposes, especially in regard of drag and interference prediction. The reasons for these deficiencies are investigated and a way to overcome them by future developments is demonstrated.},
  language  = {en}
}
@incollection{KurbelPietsch1989,
  author    = {Kurbel, Karl and Pietsch, Wolfram},
  title     = {Projektmanagementebenen bei evolution{\"a}rer Softwareentwicklung},
  series = {Interaktive betriebswirtschaftliche Informations- und Steuerungssysteme},
  booktitle = {Interaktive betriebswirtschaftliche Informations- und Steuerungssysteme},
  editor    = {Kurbel, Karl and Mertens, Peter and Scheer, August W.},
  publisher = {De Gruyter},
  address   = {Berlin},
  isbn      = {3-11-012100-X},
  doi       = {10.1515/9783110847055-013},
  pages     = {261 -- 285},
  year      = {1989},
  language  = {de}
}