@inproceedings{ZischankKernFrentzeletal.2000, author = {Zischank, Wolfgang J. and Kern, Alexander and Frentzel, Ralf and Heidler, Fridolin and Seevers, M.}, title = {Assessment of the lightning transient coupling to control cables interconnecting structures in large industrial facilities and power plants}, year = {2000}, abstract = {Large industrial facilities and power plants often require a huge number fo information and control cables between the differnet structures. These I\&C-cables can be routed in reinforced concrete cable ducts or in isolated buried cable runs. KTA 2206 is the German lightning protection standard for nuclear power plants. During the last several years considerable effort has been made to revise this standard. Despite the well established principles and design guidelines for the construction of the lightning protection system, this standard puts special emphasis on the coupling of transient overvoltages to I\&C-cables.}, language = {en} } @article{WolfFoltzSchlicketal.2000, author = {Wolf, Martin and Foltz, Christian and Schlick, Christopher and Luczak, Holger}, title = {Empirical Investigation of a workspace model for Chemical engineers / Wolf, Martin ; Foltz, Christian ; Schlick, Christopher ; Luczak, Holger}, series = {Proceedings of the Human Factors and Ergonomics Society Annual Meeting July 2000. 44 (2000), H. 6}, journal = {Proceedings of the Human Factors and Ergonomics Society Annual Meeting July 2000. 44 (2000), H. 6}, publisher = {-}, pages = {612 -- 615}, year = {2000}, language = {en} } @book{WolfFoltzKillich2000, author = {Wolf, Martin and Foltz, Christian and Killich, S.}, title = {K3 User Guide}, publisher = {RWTH}, address = {Aachen}, pages = {1 -- 13}, year = {2000}, language = {en} } @article{Wolf2000, author = {Wolf, Martin}, title = {Groupware related task design}, series = {ACM SIGGROUP Bulletin. 21 (2000), H. 2}, journal = {ACM SIGGROUP Bulletin. 21 (2000), H. 2}, publisher = {-}, pages = {5 -- 8}, year = {2000}, language = {en} } @article{Wolf2000, author = {Wolf, Martin}, title = {Groupware related task design}, series = {ACM SIGGROUP Bulletin}, volume = {21}, journal = {ACM SIGGROUP Bulletin}, number = {2}, issn = {2372-7403}, doi = {10.1145/605660.605662}, pages = {5 -- 8}, year = {2000}, abstract = {his report summarizes the results of a workshop on Groupware related task design which took place at the International Conference on Supporting Group Work Group'99, Arizona, from 14 th to 17 th November 1999. The workshop was addressed to people from different viewpoints, backgrounds, and domains: - Researchers dealing with questions of task analysis and task modeling for Groupware application from an academic point of view. They may contribute modelbased design approaches or theoretically oriented work - Practitioners with experience in the design and everyday use of groupware systems. They might refer to the practical side of the topic: "real" tasks, "real" problems, "real" users, etc.}, language = {en} } @article{WittmannKehrWillnecker2000, author = {Wittmann, Klaus and Kehr, J. and Willnecker, R.}, title = {Decentralized Payload Operations Concept for Columbus}, year = {2000}, language = {en} } @article{Wittmann2000, author = {Wittmann, Klaus}, title = {Overview of Space Operations at DLR}, year = {2000}, language = {en} } @article{WemhoenerHafnerSchwarzer2000, author = {Wemh{\"o}ner, Carsten and Hafner, Bernd and Schwarzer, Klemens}, title = {Simulation of solar thermal systems with CARNOT blockset in the environment MATLAB-Simulink}, pages = {1 -- 6}, year = {2000}, language = {en} } @article{Weigand2000, author = {Weigand, Christoph}, title = {Economically Optimal Adaptive Inspection Policies}, series = {Economic Quality Control. 15 (2000), H. 1/2}, journal = {Economic Quality Control. 15 (2000), H. 1/2}, isbn = {0940-5151}, pages = {55 -- 77}, year = {2000}, language = {en} } @article{VitusevichFoersterReetzetal.2000, author = {Vitusevich, S. A. and F{\"o}rster, Arnold and Reetz, W. and L{\"u}th, H. and Belyaev, A. E. and Danylyuk, S. V.}, title = {Spectral Responsivity of single-quantum-well photodetectors}, series = {Applied Physics Letters. 77 (2000), H. 1}, journal = {Applied Physics Letters. 77 (2000), H. 1}, isbn = {1077-3118}, pages = {16 -- 18}, year = {2000}, language = {en} } @article{VitusevichFoersterReetzetal.2000, author = {Vitusevich, S. A. and F{\"o}rster, Arnold and Reetz, W. and L{\"u}th, H. and Belyaev, A. E. and Danylyuk, S. V.}, title = {Fine structure of photoresponse spectra in a double-barrier resonant tunnelling diode}, series = {Nanotechnology. 11 (2000), H. 4}, journal = {Nanotechnology. 11 (2000), H. 4}, isbn = {1361-6528}, pages = {305 -- 308}, year = {2000}, language = {en} } @article{VitusevichFoersterIndlekoferetal.2000, author = {Vitusevich, S. A. and F{\"o}rster, Arnold and Indlekofer, K.-M. and L{\"u}th, H. and Belyaev, A. E. and Glavin, B. A. and Konakova, R. V.}, title = {Tunneling Through X-Valley-Related Impurity States in GaAs/AlAs Resonant-Tunneling Diodes}, series = {Physical Review . B. 61 (2000), H. 16}, journal = {Physical Review . B. 61 (2000), H. 16}, isbn = {1550-235X}, pages = {10898 -- 10904}, year = {2000}, language = {en} } @article{TillmannFoerster2000, author = {Tillmann, K. and F{\"o}rster, Arnold}, title = {Critical dimensions for the formation of interfacial misfit dislocations of In0.6Ga0.4As islands on GaAs(001)}, series = {Thin Solid Films. 368 (2000), H. 1}, journal = {Thin Solid Films. 368 (2000), H. 1}, isbn = {0040-6090}, pages = {93 -- 104}, year = {2000}, language = {en} } @article{TemizArtmannBaskurtPekcetinetal.2000, author = {Temiz Artmann, Ayseg{\"u}l and Baskurt, Oguz K. and Pekcetin, C. and Kandemir, F.}, title = {Leukocyte activation, oxidant stress and red blood cell properties after acute, exhausting exercise in rats. Temiz, A.; Baskurt, O. K., Pekcetin, C.; Kandemir, F.; G{\"u}re, A.}, series = {Clinical Hemorheology and Microcirculation. 22 (2000), H. 4}, journal = {Clinical Hemorheology and Microcirculation. 22 (2000), H. 4}, isbn = {1386-0291}, pages = {253 -- 259}, year = {2000}, language = {en} } @article{TaylorSchmitzZiemonsetal.2000, author = {Taylor, J. G. and Schmitz, N. and Ziemons, Karl and Grosse-Ruyken, M.-L. and Gruber, O. and M{\"u}ller-G{\"a}rtner, H.-W. and Shah, N. J.}, title = {The network of brain areas involved in the motion aftereffect}, series = {Neuroimage}, volume = {11}, journal = {Neuroimage}, number = {4}, isbn = {1053-8119}, pages = {257 -- 270}, year = {2000}, abstract = {A network of brain areas is expected to be involved in supporting the motion aftereffect. The most active components of this network were determined by means of an fMRI study of nine subjects exposed to a visual stimulus of moving bars producing the effect. Across the subjects, common areas were identified during various stages of the effect, as well as networks of areas specific to a single stage. In addition to the well-known motion-sensitive area MT the prefrontal brain areas BA44 and 47 and the cingulate gyrus, as well as posterior sites such as BA37 and BA40, were important components during the period of the motion aftereffect experience. They appear to be involved in control circuitry for selecting which of a number of processing styles is appropriate. The experimental fMRI results of the activation levels and their time courses for the various areas are explored. Correlation analysis shows that there are effectively two separate and weakly coupled networks involved in the total process. Implications of the results for awareness of the effect itself are briefly considered in the final discussion.}, language = {en} } @article{StreunBrandenburgLarueetal.2000, author = {Streun, M. and Brandenburg, G. and Larue, H. and Zimmermann, E. and Ziemons, Karl and Halling, H.}, title = {Pulse recording by free-running sampling}, series = {2000 IEEE Nuclear Science Symposium Conference Record, Vol. 2}, journal = {2000 IEEE Nuclear Science Symposium Conference Record, Vol. 2}, issn = {1082-3654}, pages = {9/179 -- 9/181}, year = {2000}, abstract = {Pulses from a position-sensitive photomultiplier (PS-PMT) are recorded by free running ADCs at a sampling rate of 40 MHz. A four-channel acquisition-board has been developed which is equipped with four 12 bit-ADCs connected to one FPGA (field programmable gate array). The FPGA manages data acquisition and the transfer to the host computer. It can also work as a digital trigger, so a separate hardware-trigger can be omitted. The method of free running sampling provides a maximum of information, besides the pulse charge and amplitude also pulse shape and starting time are contained in the sampled data. These informations are crucial for many tasks such as distinguishing between different scintillator materials, determination of radiation type, pile-up recovery, coincidence detection or time-of-flight applications. The absence of an analog integrator allows coping with very high count rates. Since this method is going to be employed in positron emission tomography (PET), the position of an event is another important information. The simultaneous readout of four channels allows localization by means of center-of-gravity weighting. First results from a test setup with LSO-scintillators coupled to the PS-PMT are presented}, language = {en} } @inproceedings{StaatHeitzer2000, author = {Staat, Manfred and Heitzer, Michael}, title = {Direct static FEM approach to limit and shakedown analysis}, year = {2000}, abstract = {Safety and reliability of structures may be assessed indirectly by stress distributions. Limit and shakedown theorems are simplified but exact methods of plasticity that provide safety factors directly in the loading space. These theorems may be used for a direct definition of the limit state function for failure by plastic collapse or by inadaptation. In a FEM formulation the limit state function is obtained from a nonlinear optimization problem. This direct approach reduces considerably the necessary knowledge of uncertain technological input data, the computing time, and the numerical error. Moreover, the direct way leads to highly effective and precise reliability analyses. The theorems are implemented into a general purpose FEM program in a way capable of large-scale analysis.}, subject = {Einspielen }, language = {en} } @book{StaatHeitzerYanetal.2000, author = {Staat, Manfred and Heitzer, M. and Yan, Ai-Min and Khoi, Vu Duc and Nguyen, Dang Hung and Valdoire, F. and Lahousse, A.}, title = {Limit Analysis of Defects}, publisher = {Forschungszentrum J{\"u}lich}, address = {J{\"u}lich}, issn = {0944-2952}, pages = {89 S.}, year = {2000}, language = {en} } @article{StaatHeitzer2000, author = {Staat, Manfred and Heitzer, M.}, title = {Reliability Analysis of Elasto-Plastic Structures under Variable Loads}, series = {Inelastic analysis of structures under variable loads : theory and engineering applications / Maier, G.; Weichert, D. [ed]}, journal = {Inelastic analysis of structures under variable loads : theory and engineering applications / Maier, G.; Weichert, D. [ed]}, publisher = {Kluwer Academic Publ.}, address = {Dordrecht}, isbn = {0-7923-6645-X}, pages = {269 -- 288}, year = {2000}, language = {en} } @article{Staat2000, author = {Staat, Manfred}, title = {Basis Reduction for the Shakedown Problem for Bounded Kinematic Hardening Material}, year = {2000}, abstract = {Limit and shakedown analysis are effective methods for assessing the load carrying capacity of a given structure. The elasto-plastic behavior of the structure subjected to loads varying in a given load domain is characterized by the shakedown load factor, defined as the maximum factor which satisfies the sufficient conditions stated in the corresponding static shakedown theorem. The finite element dicretization of the problem may lead to very large convex optimization. For the effective solution a basis reduction method has been developed that makes use of the special problem structure for perfectly plastic material. The paper proposes a modified basis reduction method for direct application to the two-surface plasticity model of bounded kinematic hardening material. The considered numerical examples show an enlargement of the load carrying capacity due to bounded hardening.}, subject = {Finite-Elemente-Methode}, language = {en} }