TY - JOUR A1 - Göttsche, Joachim A1 - Alexopoulos, Spiros A1 - Dümmler, Andreas A1 - Maddineni, S. K. T1 - Multi-Mirror Array Calculations With Optical Error N2 - The optical performance of a 2-axis solar concentrator was simulated with the COMSOL Multiphysics® software. The concentrator consists of a mirror array, which was created using the application builder. The mirror facets are preconfigured to form a focal point. During tracking all mirrors are moved simultaneously in a coupled mode by 2 motors in two axes, in order to keep the system in focus with the moving sun. Optical errors on each reflecting surface were implemented in combination with the solar angular cone of ± 4.65 mrad. As a result, the intercept factor of solar radiation that is available to the receiver was calculated as a function of the transversal and longitudinal angles of incidence. In addition, the intensity distribution on the receiver plane was calculated as a function of the incidence angles. KW - solar process heat KW - concentrating collector KW - raytracing KW - point-focussing system Y1 - 2019 SP - 1 EP - 6 ER - TY - CHAP A1 - Haissig, M. A1 - Dören, Horst-Peter A1 - Stadler, P. T1 - The horizontal continuous casting process of steel - a contribution to the economic production of unalloyed, alloyed and high alloyed steel T2 - VOEST-Alpine Continuous Casting Conference : 12.-15. 10.1981, Johannes-Keppler-Universität Linz Y1 - 1981 SP - Vortrag 21 CY - Linz ER - TY - CHAP A1 - Handschuh, Nils A1 - Stollenwerk, Dominik A1 - Borchert, Jörg T1 - Operation of thermal storage power plants under high renewable grid penetration T2 - NEIS 2021: Conference on Sustainable Energy Supply and Energy Storage Systems N2 - The planned coal phase-out in Germany by 2038 will lead to the dismantling of power plants with a total capacity of approx. 30 GW. A possible further use of these assets is the conversion of the power plants to thermal storage power plants; the use of these power plants on the day-ahead market is considerably limited by their technical parameters. In this paper, the influence of the technical boundary conditions on the operating times of these storage facilities is presented. For this purpose, the storage power plants were described as an MILP problem and two price curves, one from 2015 with a relatively low renewable penetration (33 %) and one from 2020 with a high renewable energy penetration (51 %) are compared. The operating times were examined as a function of the technical parameters and the critical influencing factors were investigated. The thermal storage power plant operation duration and the energy shifted with the price curve of 2020 increases by more than 25 % compared to 2015. KW - storage optimisation KW - storage dispatch KW - thermal storage Y1 - 2021 SN - 978-3-8007-5651-3 N1 - NEIS 2021: Conference on Sustainable Energy Supply and Energy Storage Systems. 13-14 September 2021. Hamburg, Germany SP - 261 EP - 265 PB - VDE Verlag CY - Berlin ER - TY - CHAP A1 - Hardt, Arno A1 - Abdel-Gawad, A A1 - Martin, S. A1 - Reich, J. T1 - Design procedures for the Juelich QQDDQ high resolution spectrometer T2 - Proceedings, 5th International Conference on Magnet Technology (MT-5) : Rome, Italy, April 21-25, 1975 Y1 - 1975 SP - 45 EP - 51 ER - TY - JOUR A1 - Hardt, Arno A1 - Bisplinghoff, J. A1 - Ernst, J. A1 - Löhr, R. T1 - On-line apparatus BANDIT for half-life determination of short-lived neutron deficient isotopes. A. Hardt, J. Bisplinghoff, J. Ernst, R. Löhr, H. Machner, T . Mayer-Kuckuk JF - Nuclear Instruments and Methods. 143 (1977), H. 3 Y1 - 1977 SN - 0029-554X SP - 519 EP - 523 ER - TY - JOUR A1 - Hardt, Arno A1 - Köhler, M. A1 - Müller, K. D. A1 - Stoff, H. T1 - A two-dimensional position sensitive charged-particle detector for the magnetic spectrograph "BIG KARL" of the Jülich Cyclotron "JULIC". M. Köhler, K. D. Müller, H. Stoff, M. Teske, G. P. A. Berg, A. Hardt, S. Martin, C. Mayer-Böricke , J. Meißburger JF - Nuclear Instruments and Methods. 75 (1980), H. 2-3 Y1 - 1980 SN - 0029-554X SP - 357 EP - 362 ER - TY - JOUR A1 - Hardt, Arno A1 - Martin, S. A1 - Meißburger, J. A1 - Retz, R. A1 - Wimmer, J. T1 - The cryopump system of the QQDDQ magnet spectrometer BIG KARL JF - Vacuum N2 - Cryopumps without liquid nitrogen shielding are used to provide a vacuum of 10−6 torr in the spectrometer. The vacuum system is subdivided in three sections that can be separated by valves. The first section (scattering chamber) has a volume of 60 l, two rotation transmissions with 35 cm dia and a sliding seal that allows a rotation of 160° without deteriorating the vacuum. The second section includes the vacuum chambers inside the magnets with 6 × 80 cm cross-section and a length of 1200 cm. The third section (detector box) has a volume of 4300 l and contains a moveable detector system. The gas inside the detector with a pressure of 760 torr is separated from the vacuum by a 15 μm mylar foil with an area of 300 cm2. The detector box can be valved off by a valve with the dimension of 10 × 100 cm. The layout of system is given. The instrumentation and the interlock system are described. First experiences with this system are presented. Y1 - 1978 U6 - http://dx.doi.org/10.1016/S0042-207X(78)80026-8 SN - 1879-2715 (E-Journal); 0042-207X (Print) VL - 28 IS - 10-11 SP - 483 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Hartung, I. A1 - Dilger, Klaus A1 - Hellmanns, Mark A1 - Böhme, Stefan T1 - Repair of non-weldable steel structures to extend the life cycle T2 - Proceedings of the IIW International Conference on Advances in Welding and Allied Technologies : July 16 - 17, 2009, Singapore. (Welding in the world ; 53.2009, special issue) Y1 - 2009 SN - 978-981-08-3259-9 SP - 569 EP - 574 PB - Springer CY - Berlin [u.a.] ER - TY - JOUR A1 - Heel, Mareike van A1 - Dikta, Gerhard A1 - Braekers, Roel T1 - Bootstrap based goodness‑of‑fit tests for binary multivariate regression models JF - Journal of the Korean Statistical Society N2 - We consider a binary multivariate regression model where the conditional expectation of a binary variable given a higher-dimensional input variable belongs to a parametric family. Based on this, we introduce a model-based bootstrap (MBB) for higher-dimensional input variables. This test can be used to check whether a sequence of independent and identically distributed observations belongs to such a parametric family. The approach is based on the empirical residual process introduced by Stute (Ann Statist 25:613–641, 1997). In contrast to Stute and Zhu’s approach (2002) Stute & Zhu (Scandinavian J Statist 29:535–545, 2002), a transformation is not required. Thus, any problems associated with non-parametric regression estimation are avoided. As a result, the MBB method is much easier for users to implement. To illustrate the power of the MBB based tests, a small simulation study is performed. Compared to the approach of Stute & Zhu (Scandinavian J Statist 29:535–545, 2002), the simulations indicate a slightly improved power of the MBB based method. Finally, both methods are applied to a real data set. Y1 - 2021 U6 - http://dx.doi.org/10.1007/s42952-021-00142-4 SN - 2005-2863 (Online) SN - 1226-3192 (Print) N1 - Corresponding author: Mareike van Heel VL - 51 PB - Springer Nature CY - Singapur ER - TY - CHAP A1 - Hellmanns, Mark A1 - Böhm, Stefan A1 - Dilger, Klaus T1 - Weight and noise reduction in power transmissions through epoxy resin foams T2 - Proceedings of the 31st annual meeting of the Adhesion Society : 17. - 20.2.2008, Austin, Texas Y1 - 2008 SP - 291 EP - 293 PB - Adhesion Society CY - Blacksburg ER -