@article{Denecke1994, author = {Denecke, Klaus-Dieter}, title = {On the characterization of primal partial algebras by strong regular hyperidentities}, year = {1994}, language = {en} } @article{DeneckeHalkowska1994, author = {Denecke, Klaus-Dieter and Halkowska, Katarzcyna}, title = {P-compatible hybrid-identities and hyperidentities}, year = {1994}, language = {en} } @article{DeneckeMalcev1994, author = {Denecke, Klaus-Dieter and Malcev, I. A.}, title = {Separation of clones by means of hyperidentities}, year = {1994}, language = {en} } @article{DeneckeWismath1994, author = {Denecke, Klaus-Dieter and Wismath, Shelly}, title = {Solid varieties of semigroups}, year = {1994}, language = {en} } @article{DeneckeKoppitz1994, author = {Denecke, Klaus-Dieter and Koppitz, J{\"o}rg}, title = {Hyperassociative semigroups}, year = {1994}, language = {en} } @article{Denecke1994, author = {Denecke, Klaus-Dieter}, title = {Pre-solid varieties}, year = {1994}, language = {en} } @book{DeneckeTodorov1994, author = {Denecke, Klaus-Dieter and Todorov, Kalco}, title = {Algebraische Grundlagen der Arithmetik}, series = {Berliner Studienreihe zur Mathematik}, volume = {4}, journal = {Berliner Studienreihe zur Mathematik}, publisher = {Heldermann}, address = {Berlin}, pages = {VIII, 200 S.}, year = {1994}, language = {de} } @article{Crome1994, author = {Crome, Erhard}, title = {Die Eliten des neuen Parteiensystems : Aufsteiger und Altsassen}, year = {1994}, language = {de} } @article{Crome1994, author = {Crome, Erhard}, title = {Ostmitteleuropa}, year = {1994}, language = {de} } @article{Crome1994, author = {Crome, Erhard}, title = {Politische Stabilit{\"a}t im Osten Europas und ihre ethnisch-nationalen Gef{\"a}hrdungen}, year = {1994}, language = {de} } @article{CromeFranzke1994, author = {Crome, Erhard and Franzke, Jochen}, title = {Towards an East German party system? : the local elections in Brandenburg in 1993}, year = {1994}, language = {en} } @article{Crome1994, author = {Crome, Erhard}, title = {Woher und wohin? : zur Analyse der osteurop{\"a}ischen Transition}, year = {1994}, language = {de} } @book{MetteCzechKlausetal.1994, author = {Mette, Dieter and Czech, Olaf and Klaus, Elisabeth and Meier, Bernd and Neumann, Karin and Schmeer, Ernst and Schmidt, Volkhard and Sachs, Conrad}, title = {Arbeitslehre aktuell : Schwerpunkt Technik, Bd. 1}, publisher = {Oldenbourg}, address = {M{\"u}nchen}, isbn = {3-486-88725-4}, pages = {208 S.}, year = {1994}, language = {de} } @book{Balderjahn1994, author = {Balderjahn, Ingo}, title = {Stadtmarketing : Ein Konzept f{\"u}r Potsdam?}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-9212}, publisher = {Universit{\"a}t Potsdam}, year = {1994}, abstract = {Inhalt: Was bedeutet eigentlich "Stadtmarketing"? Welche Gr{\"u}nde sprechen f{\"u}r ein Stadtmarketing? Tr{\"a}ger des Stadtmarketing und Organisation Phasen und Methoden der Entwicklung einer Stadtmarketing- Konzeption Strategien und Instrumente des Stadtmarketing}, language = {de} } @book{Balderjahn1994, author = {Balderjahn, Ingo}, title = {Marketing : Philosophie, Methode oder Instrument?}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-9228}, publisher = {Universit{\"a}t Potsdam}, year = {1994}, abstract = {Was ist Marketing {\"u}berhaupt? Ist es eine Philosophie, eine Methode oder ein Instrument? Diese Frage wird beantwortet, um dem Marketing ein erkennbares und pr{\"a}gnantes Profil zu geben.}, language = {de} } @misc{AscherChinReich1994, author = {Ascher, Uri M. and Chin, Hongsheng and Reich, Sebastian}, title = {Stabilization of DAEs and invariant manifolds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15625}, year = {1994}, abstract = {Many methods have been proposed for the stabilization of higher index differential-algebraic equations (DAEs). Such methods often involve constraint differentiation and problem stabilization, thus obtaining a stabilized index reduction. A popular method is Baumgarte stabilization, but the choice of parameters to make it robust is unclear in practice. Here we explain why the Baumgarte method may run into trouble. We then show how to improve it. We further develop a unifying theory for stabilization methods which includes many of the various techniques proposed in the literature. Our approach is to (i) consider stabilization of ODEs with invariants, (ii) discretize the stabilizing term in a simple way, generally different from the ODE discretization, and (iii) use orthogonal projections whenever possible. The best methods thus obtained are related to methods of coordinate projection. We discuss them and make concrete algorithmic suggestions.}, language = {en} } @misc{LeimkuhlerReich1994, author = {Leimkuhler, Benedict and Reich, Sebastian}, title = {Symplectic integration of constrained Hamiltonian systems}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15653}, year = {1994}, abstract = {A Hamiltonian system in potential form (formula in the original abstract) subject to smooth constraints on q can be viewed as a Hamiltonian system on a manifold, but numerical computations must be performed in Rn. In this paper methods which reduce "Hamiltonian differential algebraic equations" to ODEs in Euclidean space are examined. The authors study the construction of canonical parameterizations or local charts as well as methods based on the construction of ODE systems in the space in which the constraint manifold is embedded which preserve the constraint manifold as an invariant manifold. In each case, a Hamiltonian system of ordinary differential equations is produced. The stability of the constraint invariants and the behavior of the original Hamiltonian along solutions are investigated both numerically and analytically.}, language = {en} } @misc{AscherChinPetzoldetal.1994, author = {Ascher, Uri M. and Chin, Hongsheng and Petzold, Linda R. and Reich, Sebastian}, title = {Stabilization of constrained mechanical systems with DAEs and invariant manifolds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15698}, year = {1994}, abstract = {Many methods have been proposed for the simulation of constrained mechanical systems. The most obvious of these have mild instabilities and drift problems. Consequently, stabilization techniques have been proposed A popular stabilization method is Baumgarte's technique, but the choice of parameters to make it robust has been unclear in practice. Some of the simulation methods that have been proposed and used in computations are reviewed here, from a stability point of view. This involves concepts of differential-algebraic equation (DAE) and ordinary differential equation (ODE) invariants. An explanation of the difficulties that may be encountered using Baumgarte's method is given, and a discussion of why a further quest for better parameter values for this method will always remain frustrating is presented. It is then shown how Baumgarte's method can be improved. An efficient stabilization technique is proposed, which may employ explicit ODE solvers in case of nonstiff or highly oscillatory problems and which relates to coordinate projection methods. Examples of a two-link planar robotic arm and a squeezing mechanism illustrate the effectiveness of this new stabilization method.}, language = {en} } @misc{KoeberleLaschewsky1994, author = {K{\"o}berle, Peter and Laschewsky, Andr{\´e}}, title = {Hybrid materials from organic polymers and inorganic salts}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-26884}, year = {1994}, abstract = {The prepaparation of amorphous, homogeneous blends of zwitterionic polymers and transition metal salts was investigated. Homogeneous miscibility was achieved in many cases up to equimolar amounts of salt, depending on the anion and cation chosen. Various analytical techniques point to a solid state solution of the inorganic ions in the polymer matrix.}, language = {en} } @misc{Schrader1994, author = {Schrader, Lutz}, title = {Deutschland und die europ{\"a}ische Sicherheitsagenda}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-28999}, year = {1994}, language = {de} }