@incollection{SteffensSuhrkeRoessler, author = {Steffens, Oliver and Suhrke, Michael and R{\"o}ssler, Ulrich}, title = {Ground state and collective excitations of quantum dots: Correlation effects and Hund's rule in magnetic field}, series = {Advances in Solid State Physics}, volume = {39}, booktitle = {Advances in Solid State Physics}, editor = {Kramer, Bernhard}, publisher = {Friedr. Vieweg \& Sohn}, address = {Braunschweig}, isbn = {978-3-540-44553-1}, doi = {10.1007/BFb0107469}, pages = {111 -- 120}, abstract = {We review ground-state properties and collective excitations of semiconductor quantum dots in a magnetic field obtained from current-spin density-functional theory. Due to exchange-correlation, a generalized Hund's rule in magnetic field can be established which leads to spin alignment in partially occupied energy shells at the Fermi energy. This results, in distinct spin structures in single-electron addition spectra. Current-dependent exchange-correlation modifies the magnetic-field dependence of the ground state configuration and leads to deviations from plain spin-density calculations. Moreover it gives rise to spontaneous current textures at zero magnetic field. Collective excitation spectra, explicitly calculated for inelastic light scattering, exhibit novel features in their magnetic field dependence due to a finite ground-state spin density.}, language = {en} } @article{SzaboSteffensLenzetal., author = {Szab{\´o}, Peter and Steffens, Oliver and Lenz, Michael and Farkas, G{\´a}bor}, title = {Transient junction-to-case thermal resistance measurement methodology of high accuracy and high repeatability}, series = {IEEE Transactions on Components and Packaging Technologies}, volume = {28}, journal = {IEEE Transactions on Components and Packaging Technologies}, number = {4}, issn = {1521-3331}, doi = {10.1109/TCAPT.2005.859768}, pages = {630 -- 636}, abstract = {High-power packages show a characteristic three-dimensional heat flow resulting in large lateral changes in chip and case surface temperature. This paper proposes an unambiguous definition for the R/sub thJC/ junction-to-case thermal resistance as a key parameter of such packages based on a transient measurement technique ensuring high repeatability even at very low R/sub th/ values. The technique is illustrated on thermal transient measurements of high-power MOSFET devices. It is also presented how the same measurement results can be used for die attach quality analysis. Finally, a comparative method is shown for measuring the differences of R/sub th/ values among samples with many times higher resolution compared with a direct R/sub thJC/ measurement.}, language = {en} } @book{SteffensBergmannHaugetal., author = {Steffens, Oliver and Bergmann, Anja and Haug, Sonja and Rechenauer, Christian and Saller, Tobias and Schaubeck, Simon and Schr{\"o}ter, Sonja and Vernim, Matthias and Wittmann, Matthias and Zeitler, Annika}, title = {RENARHIS - Nachhaltige energetische Modernisierung und Restaurierung historischer Stadtquartiere}, edition = {Stand Januar 2016}, address = {Bonn}, organization = {Bundesinstitut f{\"u}r Bau-, Stadt- und Raumforschung -BBSR, Bonn}, isbn = {9783879942817}, url = {http://nbn-resolving.de/urn:nbn:de:101:1-201707124087}, pages = {286}, abstract = {Die Lebensqualit{\"a}t in einem Stadtquartier l{\"a}sst sich steigern, wenn Baukunst, Energieeffizienz, regenerative Energieversorgung und kosteng{\"u}nstiges Wohnen zusammenkommen. All das braucht umfassendes Know-how von Architekten, Planern und Betreibern. Forscher der Ostbayerischen Technischen Hochschule Regensburg (OTH) zeigen, wie ein historisches Stadtquartier behutsam modernisiert werden kann und gleichzeitig die Mieten bezahlbar bleiben. Das Bundesinstitut f{\"u}r Bau-, Stadt- und Raumforschung (BBSR) hat die Forschungsarbeit kostenlos herausgegeben. Die Handlungsempfehlungen des Leitfadens richten sich an Planer, Architekten und Eigent{\"u}mer. Wie l{\"a}sst sich eine Geb{\"a}udesanierung erfolgreich zum Zwecke des Klimaschutzes und der nachhaltigen Wohnqualit{\"a}t umsetzen? Strategien hierf{\"u}r entwickelten Professor Oliver Steffens und sein Forschungsteam der OTH am Beispiel des Plato-Wild-Ensembles, einem genossenschaftlichen Wohnquartier aus den 1920er-Jahren im Regensburger Osten. Das Besondere an dem Sanierungskonzept ist sein fach{\"u}bergreifender Ansatz: 30 Projektbeteiligte aus den technischen sowie wirtschafts- und sozialwissenschaftlichen Disziplinen erarbeiteten f{\"u}r das Plato-Wild-Ensemble mehrere L{\"o}sungsans{\"a}tze: Das Projektteam verfolgte nach einer eingehenden Bestandsaufnahme das Konzept der Nachverdichtung sowie der energetischen Ert{\"u}chtigung der Geb{\"a}udeh{\"u}lle. Ziel war dabei, die historische Fassade zu bewahren. Das Projektteam unterlegte die Ans{\"a}tze der architektonischen Modernisierung sowie der regenerativen Energieversorgung mit zahlreichen Entw{\"u}rfen, Berechnungen und Simulationen. Bauphysikalische Betrachtungen zum W{\"a}rme-, Feuchte- und Schallschutz waren ein weiterer wichtiger Baustein.}, language = {de} } @inproceedings{TheussElianFinketal., author = {Theuss, Horst and Elian, Klaus and Fink, Markus and Fries, M. and Kalz, Franz-Peter and Schwabe, B. and Vaupel, M. and Jaroschek, C. and Schubert, A. and Hummel, H. and Steffens, Oliver}, title = {Mechanical Stress Impact of Assembly Processes onto a Stress-sensitive Testchip}, series = {44th International Symposium on Microelectronics (IMAPS 2011), October 9 - 13, 2011, Long Beach, California, USA}, booktitle = {44th International Symposium on Microelectronics (IMAPS 2011), October 9 - 13, 2011, Long Beach, California, USA}, number = {1}, publisher = {International Microelectronics \& Packaging}, address = {Washington}, isbn = {978-1-61839-850-5}, doi = {10.4071/isom-2011-WA5-Paper3}, pages = {619 -- 626}, abstract = {A semiconductor die typically undergoes a variety of assembly processes, each of them influencing the mechanical stress environment of the chip. We report on a stress-sensitive testchip and its application to measure and characterize the respective stress distributions across the die. Particularly in the field of MEMS and sensor devices, even low stresses might deteriorate the electrical performance of a device significantly, while higher stress levels may even cause cracks and irreversible damage. This is why the present methodology has a high potential to develop into a useful tool in the field of sensor package development. After a brief introduction to the sensing principle, we investigate the stress distribution in various sample assemblies - all of them targeting pressure sensors. Typical low stress packages use silicone based soft elastic encapsulations. Changing to a harder material with a young's modulus comparable to standard mold compounds, we demonstrate an increase of the average stress level by more than one order of magnitude.}, language = {en} } @article{WensauerSteffensSuhrkeetal., author = {Wensauer, Andreas and Steffens, Oliver and Suhrke, Michael and R{\"o}ssler, Ulrich}, title = {Laterally coupled few-electron quantum dots}, series = {Physical Review B}, volume = {62}, journal = {Physical Review B}, number = {4}, doi = {10.1103/PhysRevB.62.2605}, pages = {2605}, abstract = {We present ground-state calculations for laterally coupled quantum dots containing 2, 4, and 8 electrons. As our emphasis is on spin effects our results are obtained by applying spin-density functional theory (SDFT). By varying the distance between the centers of the coupled quantum dots, the transition from weak to strong coupling situation is realized. For the 2-electron system we also apply the Heitler-London approximation and analytical concepts to check the reliability of SDFT calculations in this case. In addition we discuss the features of the Coulomb staircase of laterally coupled quantum dots in the weak and strong coupling regimes in comparison to that of a circular parabolic quantum dot.}, language = {en} } @book{SpitzerGroetzbachKaiseretal., author = {Spitzer, Lena and Gr{\"o}tzbach, Holger and Kaiser, Julia and Klinck, Maxine and Lauer, Norina}, title = {FATMA 2.1}, edition = {1. Aufl.}, publisher = {Schulz-Kirchner}, address = {Idstein}, pages = {16}, abstract = {Die partizipative Zielsetzung ist die Basis einer erfolgreichen Therapie. Bei Patient*innen, die unter einer Aphasie leiden, ist der partizipative Prozess jedoch h{\"a}ufig m{\"u}hsam und zeitaufw{\"a}ndig. Mit dem Fragebogen zur Erfassung von Aktivit{\"a}ts- und Teilhabezielen im Sinne der ICF bei Menschen mit Aphasie (FATMA 2.1) liegt erstmalig ein evaluiertes und bildgest{\"u}tztes Zielsetzungsinstrument vor, das an insgesamt 138 Personen mit und ohne Aphasie {\"u}berpr{\"u}ft worden ist. FATMA 2.1 erm{\"o}glicht, trotz ausgepr{\"a}gter aphasischer St{\"o}rungen Aktivit{\"a}tsziele partnerschaftlich zwischen Personen mit einer Aphasie und Sprachtherapeut*innen zu erarbeiten. Dazu stehen insgesamt 27 prototypische Aktivit{\"a}ten aus allen Teilhabekapiteln der ICF mit einer jeweils passenden Fotografie und einem dazugeh{\"o}rigen Satz mit fett gedruckten Schl{\"u}sselw{\"o}rtern zur Verf{\"u}gung. {\"U}ber die vorgegebenen prototypischen Aktivit{\"a}ten hinaus werden die Betroffenen zudem nach weiteren f{\"u}r sie relevante Aktivit{\"a}ten gefragt. Mithilfe einer vierstufigen visuellen Bewertungsskala k{\"o}nnen Betroffene angeben, wie wichtig die jeweilige Aktivit{\"a}t f{\"u}r sie ist. Eine ebenfalls visualisierte Priorisierungshilfe erm{\"o}glicht, die wichtigen Aktivit{\"a}ten f{\"u}r eine*n Betroffen*en im Anschluss zu priorisieren. Als Ergebnis der bildlichen Unterst{\"u}tzung k{\"o}nnen mit FATMA 2.1 Aktivit{\"a}tsziele partizipativ, systematisch und zeiteffizient bestimmt werden. Ausgehend von den Zielen ist es m{\"o}glich, eine teilhabeorientierte Aphasietherapie zu planen, durchzuf{\"u}hren und zu evaluieren. 9783824812936}, subject = {Aphasie}, language = {de} } @incollection{HaugSchmidbauer, author = {Haug, Sonja and Schmidbauer, Simon}, title = {Integrationskonzepte und Messung von Integration auf kommunaler Ebene}, series = {Integration - Teilhabe und Zusammenleben in der Migrationsgesellschaft}, booktitle = {Integration - Teilhabe und Zusammenleben in der Migrationsgesellschaft}, editor = {Spieker, Michael and Hofmann, Christian}, publisher = {Nomos}, address = {Baden-Baden}, isbn = {9783748910558}, pages = {69 -- 84}, subject = {Soziale Integration}, language = {de} } @article{Schmidbauer, author = {Schmidbauer, Simon}, title = {Politische Bildung durch Soziale Arbeit im Handlungsfeld (Flucht-)Migration}, series = {Soziale Arbeit}, volume = {70}, journal = {Soziale Arbeit}, number = {4}, doi = {10.5771/0490-1606-2021-4-136}, pages = {137 -- 143}, abstract = {Politische Bildung ist ein wichtiger Bestandteil professioneller Sozialer Arbeit, auch wenn die Fachdebatte bisher noch wenig entwickelt ist. Daher werden zun{\"a}chst die normativen und konzeptionellen Grundlagen politischer Bildung durch Soziale Arbeit mit einem Fokus auf das Handlungsfeld (Flucht-) Migration herausgearbeitet. Anhand der Ergebnisse einer qualitativen Befragung von dort t{\"a}tigen Fachkr{\"a}ften wird daraufhin untersucht, welche Themen der politischen Bildung in der Praxis relevant sind.}, language = {de} } @article{MalzKrenkelSteffens, author = {Malz, Sebastian and Krenkel, Walter and Steffens, Oliver}, title = {Infrared Reflective Wall Paint in Buildings: Energy Saving Potentials and Thermal Comfort}, series = {Energy and Buildings}, volume = {224}, journal = {Energy and Buildings}, number = {October}, publisher = {Elsevier}, issn = {0378-7788}, doi = {10.1016/j.enbuild.2020.110212}, abstract = {The reduction of the energy demand of existing buildings is the main objective of building refurbishment. Managing the heat radiation properties of the wall construction is a possible way to develop highly effective and resource efficient insulation materials and concepts. The application of infrared reflective wall paints and coatings has been studied since the latter half of the 20th century. A brief review of the literature gives an account of the current research status. One has to realise that the conclusions are not uniformly consistent but depend strongly on the specific boundary conditions and investigated parameters. The study presented here discusses the usage of infrared reflective wall paint in conjunction with heat insulation for historic brick masonry. The possible energy savings are linked to the resulting thermal comfort. We identify critical parameters that must be taken into account when using infrared reflective wall paint and derive recommended design rules for the refurbishment of such building types. The findings prove that infrared reflective wall paint can decrease heat losses by 18\% and up to 22\% if comfort conditions are considered. Increasing energy savings can also cause the negative effect of high radiative asymmetry. Thus, each configuration must be observed in detail.}, language = {en} } @article{MelznerIsmailRušavyetal., author = {Melzner, Maximilian and Ismail, Khaled M. and Rušavy, Zdenek and Kališ, Vladim{\´i}r and S{\"u}ß, Franz and Dendorfer, Sebastian}, title = {Musculoskeletal lower back load of accoucheurs during childbirth - A pilot and feasibility study}, series = {European Journal of Obstetrics \& Gynecology and Reproductive Biology}, journal = {European Journal of Obstetrics \& Gynecology and Reproductive Biology}, number = {264}, publisher = {Elsevier}, doi = {10.1016/j.ejogrb.2021.07.042}, pages = {306 -- 313}, abstract = {Introduction: Back problems represent one of the leading causes of accouchers' work-related musculoskeletal morbidities. The correct execution of birth-related maneuvers including manual perineal protection is crucial not only for the mother and child but also for obstetricians and midwives to reduce any strain on their musculoskeletal system. Therefore, the overall aim of this study was to test the feasibility of determining the effect of different accouchers' postures (standing and kneeling) on their musculoskeletal system. Methods: The biomechanical analysis is based on musculoskeletal simulations that included motion recordings of real deliveries as well as deliveries conducted on a birthing simulator. These simulations were then used to determine individual joints' loads. Results: In the kneeling posture, both a low intra-operator variability and a lower average maximum load of the lower back was observed. For the standing position the spine load was reduced by pivoting the elbow on the accouchers' thigh, which in turn was associated with a significantly greater load on the shoulder joint. Conclusion: The study demonstrated the feasibility of our technique to assess joints loads. It also provided initial data indicating that a posture that reduces spinal flexion and tilt, achieved in this study by the kneeling, can significantly reduce the strain on the practitioner's musculoskeletal system.}, language = {en} } @misc{HaugLauerMeusslingSentpalietal., author = {Haug, Sonja and Lauer, Norina and Meussling-Sentpali, Annette and Mohr, Christa and Pfingsten, Andrea and Raptis, Georgios and Weber, Karsten and Bahr, Gudrun and Currle, Edda and Ettl, Katrin and Frommeld, Debora and Greiner, Nina and Kudienko, Natalie and Lichtenauer, Norbert and Middel, Luise and M{\"u}cke, Vanessa and Popp, Christof}, title = {TePUS - Telepr{\"a}senzroboter f{\"u}r die Pflege}, series = {TRIOKON 2020 : Wissenschaft, Wirtschaft, Gesellschaft in Ostbayern, 29.09.2019, Landshut}, journal = {TRIOKON 2020 : Wissenschaft, Wirtschaft, Gesellschaft in Ostbayern, 29.09.2019, Landshut}, language = {de} } @misc{HaugLauerMeusslingSentpalietal., author = {Haug, Sonja and Lauer, Norina and Meussling-Sentpali, Annette and Mohr, Christa and Pfingsten, Andrea and Raptis, Georgios and Weber, Karsten and Bahr, Gudrun and Currle, Edda and Ettl, Katrin and Frommeld, Debora and Greiner, Nina and Kudienko, Natalie and Lichtenauer, Norbert and Middel, Luise and M{\"u}cke, Vanessa and Popp, Christof}, title = {Telepr{\"a}senzroboter f{\"u}r die Pflege und Unterst{\"u}tzung von Schlaganfallpatinnen und -patienten (TePUS)}, series = {Virtuelle Tagung "DeinHaus 4.0 Oberpfalz", 2020, Ostbayerische Technische Hochschule Regensburg}, journal = {Virtuelle Tagung "DeinHaus 4.0 Oberpfalz", 2020, Ostbayerische Technische Hochschule Regensburg}, language = {de} }