TY  - JOUR
A1  - Alt, Helmut
T1  - Steuerreformgesetz 1990
JF  - Elektrizitätswirtschaft
Y1  - 1989
SN  - 0947-0581 (E-Journal); 0340-7918 (Print)
VL  - Jg. 88
IS  - H. 2
SP  - 120
EP  - 121
ER  - 
TY  - CHAP
A1  - Baumann, Marcus
ED  - Hempel, G.
T1  - Primary production and phytoplankton growth in the marginal ice zone of the Fram Strait and the interpretation of the field data with autecological experiments (Abstract)
T2  - Oceanography and biology of Arctic seas : selected papers from the ICES Symposium on Marine Sciences of the Arctic and Subarctic Regions, held in Santander, 28 - 30 September 1987. (Rapports et procès-verbaux des réunions / Conseil International pour l'Exploration de la Mer ; 188)
Y1  - 1989
SP  - 128
PB  - International Council for the Exploration of the Sea
CY  - Copenhagen
ER  - 
TY  - CHAP
A1  - Kurbel, Karl
A1  - Pietsch, Wolfram
ED  - Kurbel, Karl
ED  - Mertens, Peter
ED  - Scheer, August W.
T1  - Projektmanagementebenen bei evolutionärer Softwareentwicklung
T2  - Interaktive betriebswirtschaftliche Informations- und Steuerungssysteme
Y1  - 1989
SN  - 3-11-012100-X
U6  - https://doi.org/10.1515/9783110847055-013
SP  - 261
EP  - 285
PB  - De Gruyter
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Saffe, P.
A1  - Lodewiks, J.
A1  - Haas, H.-J.
A1  - Feigel, H.-J.
A1  - Ulrich, H.
A1  - Mauer, J.
A1  - Ortwig, H.
A1  - Dahmann, Peter
A1  - Rotthäuser, S.
A1  - Tao, J.
A1  - Ohlischläger, O.
A1  - Scholz, D.
A1  - Bergmann, M.
A1  - Anders, P.
T1  - Neues von ASB Antreiben – Steuern – Bewegen
JF  - Ölhydraulik und Pneumatik. Vol. 33 (1989), H. 7
Y1  - 1989
SN  - 0341-2660
SP  - 550
EP  - 572
ER  - 
TY  - CHAP
A1  - Staat, Manfred
A1  - Ballmann, J.
T1  - Fundamental aspects of numerical methods for the propagation of multi-dimensional nonlinear waves in solids
T2  - Nonlinear hyperbolic equations : theory, computations methods, and applications ; proceedings of the 2nd International Conference on Nonlinear Hyperbolic Problems, Aachen
N2  - The nonlinear scalar constitutive equations of gases lead to a change in sound speed from point to point as would be found in linear inhomogeneous (and time dependent) media. The nonlinear tensor constitutive equations of solids introduce the additional local effect of solution dependent anisotropy. The speed of a wave passing through a point changes with propagation direction and its rays are inclined to the front. It is an open question whether the widely used operator splitting techniques achieve a dimensional splitting with physically reasonable results for these multi-dimensional problems. May be this is the main reason why the theoretical and numerical investigations of multi-dimensional wave propagation in nonlinear solids are so far behind gas dynamics. We hope to promote the subject a little by a discussion of some fundamental aspects of the solution of the equations of nonlinear elastodynamics. We use methods of characteristics because they only integrate mathematically exact equations which have a direct physical interpretation.
KW  - Nichtlineare Welle
KW  - Nichtlineare Gleichung
KW  - Festkörper
KW  - Elastodynamik
KW  - Multi-dimensional wave propagation
KW  - nonlinear solids
KW  - nonlinear tensor constitutive equation
Y1  - 1989
SP  - 574
EP  - 588
ER  - 
TY  - JOUR
A1  - Laack, Walter van
A1  - Refisch, A.
T1  - Neuralgic amyotrophy of the lumbar area. Case Report / Refisch, A. ; Laack, W. van
JF  - Archives of Orthopaedic and Trauma Surgery. 108 (1989), H. 5
Y1  - 1989
SN  - 0936-8051
SP  - 329
EP  - 332
ER  - 
TY  - JOUR
A1  - Laack, Walter van
A1  - Casser, H.-R.
T1  - Arthroskopische Behandlung der Osteochondrosis dissecans an der medialen Femurrolle
JF  - Arthroskopie. 2 (1989), H. 1
Y1  - 1989
SN  - 0933-7946
SP  - 16
EP  - 18
ER  - 
TY  - JOUR
A1  - Staat, Manfred
A1  - Ballmann, J.
T1  - Zur Problematik tensorieller Verallgemeinerungen einachsiger nichtlinearer Materialgesetze
JF  - Zeitschrift für angewandte Mathematik und Mechanik : ZAMM. 69 (1989), H. 2
Y1  - 1989
SN  - 0946-8463
U6  - https://doi.org/10.1515/9783112553169-006
SP  - 73
EP  - 81
ER  - 
TY  - JOUR
A1  - Laack, Walter van
A1  - Refisch, A.
T1  - Die neuralgische Amyotrophie des Lumbalbereiches / Refisch, A. ; Laack, W. van
JF  - Orthopädische Praxis. 7 (1989)
Y1  - 1989
SN  - 0030-588x
SP  - 437
ER  - 
TY  - THES
A1  - Rosenkranz, Josef
T1  - Die Gleitlagergehäusesteifigkeit als modaler Parameter für Rotorsysteme
Y1  - 1989
N1  - Aachen, Techn. Hochsch., Diss., 1989
CY  - Aachen
ER  -