TY - THES A1 - Höller, Christoph T1 - Indirect methods of obtaining activity and mobility of structure-borne sound sources N2 - The work reported in this thesis focuses on the development of indirect methods for the experimental determination of important source parameters for structure-borne sound source characterization. In the first part of the thesis, matrix inversion methods for the determination of blocked forces are investigated. A simplified measurement procedure is proposed which offers a solution to the two major challenges to these methods, namely the acquisition of the FRF matrix and the problems associated with matrix inversion. The proposed procedure involves a free, low-mobility receiver plate which is modelled numerically. Calculated FRFs are used together with measured velocity responses to inversely determine the blocked forces. It is found that while the method has great potential in principle, in practice the accurate modelling of the receiver plate is of critical importance. In the second part of the thesis, three formulations are considered for the indirect determination of source mobility. Instead of performing measurements on the source in the free state, the source mobility is obtained from measurements made in-situ. This approach is beneficial if the source is difficult to suspend, or if it contains non-linear structural elements. The three formulations are validated numerically and experimentally. It is found that the methods can quantify source mobilities of single-contact and multi-contact sources from in-situ measurements. However, typical measurement errors, such as background noise or inaccuracies in sensor positioning, can significantly reduce the accuracy and reliability of the methods. In the final part of the thesis, the reception plate method for the determination of the power injected by a high-mobility source into a low-mobility receiver is reviewed, and a source substitution method proposed as a development. The substitution method circumvents problems that may arise when the reception plate method is applied to coupled walls and floors. A special focus of investigation is on the calibration of the receiver structure. It is found that the calibration can be performed with shaker or hammer, and that an average calibration factor may be used. The source substitution method thus offers a potential alternative to the reception plate method, for application with coupled plates. Y1 - 2013 UR - https://livrepository.liverpool.ac.uk/id/eprint/14233 N1 - University of Liverpool, Dissertation PB - University of Liverpool CY - Liverpool ER - TY - JOUR A1 - Bauhuber, Michael A1 - Mikrievskij, Andreas A1 - Lechner, Alfred T1 - Isotropic wet chemical etching of deep channels with optical surface quality in silicon with HNA based etching solutions JF - Materials Science in Semiconductor Processing N2 - Online trace analysis based on UV/Vis spectroscopy requires long detection paths. Therefore an isotropic wet etch process in silicon is developed to fabricate a 300 µm deep channel with low channel wall roughness for desired light guidance application. Four etchant compositions were compared in terms of etching rate, surface roughness and selectivity in a beaker process. The best fitting mixture was selected. To further increase the surface quality (bubble issue) a spin etcher tool is used for producing the channels. The dependence of homogeneity and defect density on media flux, and rotation velocity was investigated. Results show that high rotation velocity and high media flux lead to great defects in the channel wall. Through rotation of the wafer during etching, the etching rate of silicon rises compared to the beaker process due to the rapid removal of etch products and simultaneous supply of fresh etchant. After 38 min of etching, 300 µm deep semi-circular channels with high optical quality (Rq=10 nm±2 nm) over 3 m were produced. Y1 - 2013 UR - https://www.scopus.com/authid/detail.uri?authorId=22980567700#disabled U6 - https://doi.org/10.1016/j.mssp.2013.05.017 VL - 16 IS - 6 SP - 1428 EP - 1433 PB - Elsevier ER - TY - CHAP A1 - Höller, Christoph A1 - Zeitler, Berndt T1 - Laboratory study on flanking sound transmission in cold-formed steel-framed constructions T2 - Towards a quieter future : 45th International Congress and Exposition on Noise Control Engineering (Internoise 2016) : Hamburg, Germany, 21-24 August 2016, Vol 8 N2 - In a recent study at the National Research Council Canada, the sound transmission in cold-formed steel-framed constructions was investigated. The results of direct sound insulation tests of wall and floor assemblies were reported at EURONOISE 2015 and INTERNOISE 2015. This paper focuses on flanking sound transmission in cold-formed steel-framed constructions. A representative full-scale mock-up specimen was constructed in NRC’s 8-room flanking transmission facility. The specimen consists of four loadbearing walls with 152 mm deep steel studs, four non-loadbearing walls with 92mm deep steel studs, and four floor-ceiling assemblies consisting of steel joists and a composite steel deck with gypsum concrete. Measurements were conducted according to the indirect method described in ISO 10848. The individual flanking paths were measured by a sequence of transmission loss measurements in which other transmission paths were suppressed by shielding. For the bare specimen without linings, the sound transmission for horizontally adjacent rooms with continuous subfloors is dominated by the floor-floor flanking paths. Floor coverings or floor toppings are needed to meet the requirements in the National Building Code of Canada. This paper presents details of the measurements, highlights some of the results and discusses implications. Y1 - 2016 UR - https://www.researchgate.net/publication/307210627_Laboratory_Study_on_Flanking_Sound_Transmission_in_Cold-Formed_Steel-Framed_Constructions SP - 6238 EP - 6249 PB - Curran Associates Inc. ER - TY - JOUR A1 - Hutterer, Albert A1 - Bauhuber, Michael A1 - Hummel, Helmut A1 - Lechner, Alfred T1 - Real-time analyses of metal contaminations in the ppb-range JF - Solid State Phenomena N2 - In high-tech processing even smallest concentrations of metal ions in process media are of the utmost significance because they cause expensive production failures. Currently, cost-intensive equipment, special trained staff and time consuming analyses are necessary to detect these contaminations in order to avoid failures. The Centers of Excellence Nanochem and Sensorics at the University of Applied Sciences Regensburg (owner of patent PCT/EP2010/064833) and their industrial partner Micro-Epsilon GmbH are developing a new miniaturized measurement device which allows cost-effective real-time analysis of fluidic media for the first time. The system is fully automated and can be directly connected to wet-etch benches. Hence it allows continuous real-time surveillance of metal contaminations in the ppb-range through absorption spectroscopy in process media. For this purpose a very small sample amount of the process medium and a specific complexing agent are mixed together. This leads to an increase in the molar extinction coefficients and though even smallest contaminations become visible. The main parts of our development are the simulation of the different system components, their production and chemical analyses with the evaluation model. KW - Absorption KW - Analysis KW - Complexing Agent KW - Light Guidance KW - Liquid-Core Waveguide KW - Metal Ions KW - Online Measurement KW - Real-Time KW - Total Internal Reflection Y1 - 2013 U6 - https://doi.org/10.4028/www.scientific.net/SSP.195 VL - 195 SP - 269 EP - 273 PB - Trans Tech Publications ER - TY - CHAP A1 - Höller, Christoph A1 - Zeitler, Berndt A1 - Mahn, Jeffrey T1 - Direct sound transmission loss of heavy gauge steel stud walls T2 - Proceedings of Euronoise 2015 : 10th European Congress and Exposition on Noise Control Engineering : Maastricht, 31 May - 3 June 2015 Y1 - 2015 SP - 1121 EP - 1126 CY - Maastricht ER - TY - JOUR A1 - Jungnitsch, Georg T1 - Psychotherapeutische Verfahren bei chronischen Schmerzen JF - Fortschritte der Medizin N2 - Psychotherapeutic possibilities of treating chronic pain are employed in two different ways: Firstly in the form of psychotherapy in patients whose strategies for coping with pain and/or pain genesis can be described in terms of psychopathological categories; secondly in the form of pain-coping training, which is generally indicated in the presence of chronic pain, in particular that which is traditionally termed organic. With respect to their effectiveness in achieving, in the first place, mood change, and in the assessment of symptoms, the individual procedures have been well tested. The question as to differential indication, which can most readily be applied to the use of biofeedback, remains largely unanswered. T2 - Psychotherapeutic possibilities of treating chronic pain Y1 - 1990 UR - https://www.researchgate.net/publication/292930409_Psychotherapeutic_possibilities_of_treating_chronic_pain VL - 108 IS - 8 SP - 50 EP - 58 ER - TY - JOUR A1 - Peter, Daniel A1 - Dalmer, Michael A1 - Lechner, Alfred A1 - Gigler, Alexander M. A1 - Stark, Robert W. A1 - Bensch, Wolfgang T1 - Measurement of the mechanical stability of semiconductor line structures in drying liquids with application to pattern collapse JF - Journal of Micromechanics and Microengineering N2 - Enhanced particle removal processes in wet cleaning as well as drying processes of semiconductor wafers can cause significant lateral forces on surface structures. These forces, however, must not exceed the mechanical stability of structures on the wafer. Thus, a mechanical fracture test was used to assess the lateral mechanical stability of polysilicon line structures in relevant process liquids. The mechanical test was based on nanomanipulation with an atomic force microscope. Compared to fracture tests in air, data acquired in liquid isopropanol revealed a stabilizing effect. The differences in fracture forces can be attributed to a stress corrosion process on the surface. The size of the generated damage was influenced by the viscosity of the surrounding media. Y1 - 2011 U6 - https://doi.org/10.1088/0960-1317/21/2/025001 VL - 21 IS - 2 PB - IOP Science ER - TY - CHAP A1 - Peter, Daniel A1 - Dalmer, Michael A1 - Lotnyk, Andriy A1 - Kienle, Lorenz A1 - Lechner, Alfred A1 - Bensch, Wolfgang T1 - Solid bridging during pattern collapse (stiction) studied on silicon nanoparticles T2 - MRS Online Proceedings Library N2 - The high surface to volume ratio of nanoparticles allows a detailed experimental study of the surface phenomena associated with solid bridging. Besides bulk analyses, the local view on the structure and composition via HRTEM is particularly essential. 50 nm core shell particles consisting of a silicon (Si) core and a SiO2 shell were used as model system to understand surface phenomena appearing for Si-based nanostructures. Evaporative drying from de-ionized water shows the most significant bridging effect based on SiO2. There is only a localized deposition of oxides between the particles during the drying process and no overall oxidation. For the deposition material, silicates are the most likely candidates. Y1 - 2011 U6 - https://doi.org/10.1557/opl.2011.397 VL - 1299 SP - 191 EP - 196 PB - Springer Nature ER - TY - CHAP A1 - Zeitler, Berndt A1 - Höller, Christoph A1 - Mahn, Jeffrey T1 - Empirical model of direct sound transmission through lightweight wood-framed construction T2 - Implementing noise control technology : 44th International Congress and Exposition on Noise Control Engineering (Internoise 2015) : San Francisco, California, USA, 9 - 12 August 2015 N2 - Tools to predict sound transmission through building elements are beneficial from both amarketing and a research standpoint. Prediction models can assist with the optimization ofelement performance and often reduce both cost and time in projects. However, the morephysical phenomena are to be included in the model, the more input data that is needed,which in some cases can be quite time-consuming and costly to collect. A balance is neededbetween the input and modeling effort and the output, which is usually delivered in onethird octave frequency bands or single number ratings. Many different types of models arecommonly used, including analytical, numerical, and empirical are used, all of which haveadvantages and disadvantages. In this paper, the latter type is presented using a set ofphysical properties of lightweight wood elements, and the errors made in the prediction arequantified. The disadvantage of empirical compared to analytical modeling is that thephysical phenomena are more difficult to identify. The advantage is often the simplicityand accuracy of the prediction results. Y1 - 2015 UR - https://www.researchgate.net/publication/281065914_Empirical_Model_of_Direct_Sound_Transmission_through_Lightweight_Wood-Framed_Construction PB - Curran CY - Red Hook, NY ER - TY - CHAP A1 - Zeitler, Berndt A1 - Mahn, Jeffrey A1 - Sabourin, Ivan A1 - Höller, Christoph A1 - Schoenwald, Stefan T1 - Apparent airborne sound insulation of hybrid wood-concrete masonry assemblies T2 - Euronoise 2015 : 10th European Congress and Exposition on Noise Control Engineering : Maastricht, 31 May - 3 June 2015 N2 - As part of a research project to develop design solutions for concrete-masonry buildings for the Canadian market, the apparent sound insulation performance of hybrid assemblies with concrete masonry walls and wood joist floors was evaluated. In this paper, the effect of junction coupling is investigated in an ISO 15712 flanking prediction context. Airborne flanking path data predicted according to ISO 15712 are compared to data measured using the indirect ISO 10848 shielding method. Recommendations are made on how appropriate the application of ISO 15712 is for this type of hybrid assembly. Y1 - 2015 UR - https://www.conforg.fr/euronoise2015/proceedings/data/articles/000436.pdf SP - 2515 EP - 2520 CY - Maastricht ER - TY - JOUR A1 - Dams, Florian A1 - Navitski, Aliaksandr A1 - Prommesberger, Christian A1 - Serbun, Pavel A1 - Langer, Christoph A1 - Müller, Günter A1 - Schreiner, Rupert T1 - Homogeneous Field Emission Cathodes With Precisely Adjustable Geometry Fabricated by Silicon Technology JF - IEEE Transactions on Electron Devices N2 - Silicon-based cathodes with precisely aligned field emitter arrays of sharp tips applicable for miniaturized electron sources were successfully fabricated and characterized. This was made possible by an improved fabrication process using wet thermal oxidation, wet etching, and reactive-ion etching steps with adjustable anisotropy. As substrate materials, both p-doped silicon and n-doped silicon were used. The cathode chips contain about 3 × 10 5 Si tips/cm 2 in a triangular array with tip heights of 2.5 μm, tip radii of less than 30 nm, and spacing of 20 μm. Well-aligned field emission (FE) and excellent homogeneity from all tips (i.e., 100% efficiency) and maximum stable currents of typically 0.1 μA (0.6 μA) for p (n)-type Si were reproducibly achieved. The current-voltage characteristics of the p-Si tips exhibit the expected saturation at around 10 nA with around ten times better current stability, whereas the n-Si tips show the usual Fowler-Nordheim behavior. Additional coating of the Si tips with 5-nm Cr and 10-nm Au layers resulted in improved stability and at least five times higher average FE current limits (about 3 μA) at about 30% higher operation voltage. KW - cathodes KW - electron field emission KW - elemental semiconductors KW - Field emission (FE) cathodes KW - field emitter array (FEA) KW - miniaturized electron sources KW - oxidation KW - silicon KW - silicon tips KW - sputter etching Y1 - 2012 U6 - https://doi.org/10.1109/TED.2012.2206598 SN - 0018-9383 SN - 1557-9646 VL - 59 IS - 10 SP - 2832 EP - 2837 PB - IEEE ER - TY - JOUR A1 - Tan, Pi Lin A1 - Yeap, Guan Yeow A1 - Chow, Wen Shyang A1 - Schreiner, Rupert A1 - Cheong, Kuan Yew T1 - Effect of Thickness of Porphyrin on Electrical Properties of Organic Devices JF - Advanced Materials Research (AMR) N2 - The study on electrical properties for both 2,3,7,8,12,13,17,18-octaethyl-21,23H-porphine Cu (II) (Cu-porphyrin) and 2,3,7,8,12,13,17,18-octaethyl-21,23H-porphine (porphyrin) thin film, which were fabricated using spin coating method was conducted. Porphyrins were diluted with chloroform of various concentrations (0.05 mg/ml, 0.1 mg/ml, 0.5 mg/ml, 2.0 mg/ml and 3.0 mg/ml). The solution was spin coated on top of glass substrates. A layer of aluminum was evaporated on top of the organic thin film through thermal evaporation and shadow mask was placed on top of the organic thin film where two electrodes with a gap of 50 μm were formed. Surface morphology of the organic thin film was observed by scanning electron microscope (SEM) and profilometer. Different concentrations of organic solutions greatly affected the molecular packing and arrangement order of the organic thin film and thickness of the organic layer and eventually affected electrical properties of the devices. KW - Porphyrin KW - Electrical Properties KW - Spin Coating Y1 - 2014 U6 - https://doi.org/10.4028/www.scientific.net/AMR.1024.381 SN - 1662-8985 SN - 1022-6680 VL - 1024 SP - 381 EP - 384 PB - Trans Tech Publications Ltd. CY - Baech ER - TY - JOUR A1 - Langer, Christoph A1 - Berndt, Dominik A1 - Schreiner, Rupert T1 - Sensitivity of thermal conductivity vacuum gauges for constant current and constant temperature operation JF - Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics N2 - To optimize the measurement range of thermal conductivity vacuum gauges, an expression for the sensitivity is required that takes into account all geometrical, material-specific, and operating parameters. Therefore, equations of the sensor output signal as a function of the pressure for the constant current and the constant temperature mode have been developed analytically. Based on these equations, the sensitivity of the vacuum gauge and its influencing parameters was investigated and discussed. For comparable conditions, the constant temperature operation shows a significantly higher sensitivity for high pressures, while the constant current operation shows higher sensitivity at low pressures. The sensitivity in both the constant current and the constant temperature mode depends on the ratio of the filament surface area and the parasitic thermal conductance. In addition, for the constant current operation, the sensitivity also depends on the current value and the temperature coefficient of the filament resistor. For the constant temperature operation, the sensitivity additionally depends on the distance of the filament and the reference plane. However, to extend the measurement range of a thermal conductivity vacuum gauge toward low pressures, a reduction of the parasitic thermal conductance is mandatory for both the constant current and the constant temperature mode. Y1 - 2022 U6 - https://doi.org/10.1116/6.0001964 VL - 40 IS - 5 PB - AIP Publishing ER - TY - CHAP A1 - Dams, Florian A1 - Prommesberger, Christian A1 - Schreiner, Rupert T1 - Fabrication process of silicon-tip-arrays for field emission applications T2 - 24th International Vacuum Nanoelectronics Conference (IVNC), 2011 : 18 - 22 July 2011, Historische Stadthalle Wuppertal, Germany N2 - A micromachined process to assemble homogeneous and reproducible tip arrays for field emission applications is developed and characterized. As substrate material p- as well as n-doped silicon is used. Lateral position of the tips is defined by structuring silicon dioxide to discs in a photolithographic process. Vertical structure of the tips is defined by a combination of RIE dry etching with controlled anisotropy and thermally oxidization of silicon in order to sharpen the tips. Hence field emitter arrays (FEAs) can be assembled both as bare and coated cathodes. To assemble field emission diodes, this fabrication process allows placing a metal anode in a micrometer order distance to the tips by a self-aligning procedure. The anode is placed in an evaporation process whereupon sharpening oxide is used as isolator between anode and cathode. Electrical characterization of the cathodes showed very good homogeneity, well alignment and stability over time of emission current from all tips (i.e. 100% efficiency). KW - elemental semiconductors KW - etching KW - fabrication KW - field emission KW - field emitter arrays KW - homogeneity KW - micromachining KW - oxidation, silicon KW - silicon technology Y1 - 2011 UR - https://ieeexplore.ieee.org/document/6004556?arnumber=6004556 SN - 978-3-00-035081-8 SN - 978-1-4577-1243-2 SN - 2380-6311 SN - 2164-2370 SP - 49 EP - 50 PB - IEEE ER - TY - INPR A1 - Rück, Thomas A1 - Müller, Max A1 - Jobst, Simon A1 - Weigl, Stefan A1 - Pangerl, Jonas A1 - Bierl, Rudolf A1 - Matysik, Frank-Michael T1 - Digital Twin of a Photoacoustic Trace Gas Sensor for Monitoring Methane in Complex Gas Compositions N2 - The digitalization of industrial processes requires smart sensor systems. Photoacoustic spectroscopy is well suited for this purpose as it allows for small-sized and low-cost trace gas analysis. However, the method is susceptible to changes in measurement conditions and standard calibration routines often fail to correct for all changes. We therefore created a Digital Twin (DT) of a photoacoustic trace gas sensor for methane and evaluated it regarding variations in gas composition (CH4, N2, O2, CO2, H2O), temperature and pressure. With a mean absolute percentage error of 0.8 % the accuracy of the sensor after DT compensation significantly exceeds the 24 % achieved based on standard calibration in nitrogen. For the first time, we can fully analytically compute the photoacoustic signal under moderate ambient conditions with an error in the ppbV range by taking a holistic approach. Assuming knowledge of the underlying energy transfer processes, the model of this Digital Twin can be adapted to any microphone based photoacoustic sensor for monitoring any analyte species. Y1 - 2022 U6 - https://doi.org/10.2139/ssrn.4215170 PB - Elsevier / SSRN ER - TY - JOUR A1 - Schüz, B. A1 - Dräger, D. A1 - Richter, Stefanie A1 - Kummer, K. A1 - Kuhlmey, Adelheid A1 - Tesch-Römer, C. T1 - Autonomie trotz Multimorbidität im Alter – Der Berliner Forschungsverbund AMA JF - Zeitschrift für Gerontologie und Geriatrie N2 - Mit zunehmendem Alter steigt der Anteil mehrfach erkrankter Menschen und immer mehr Menschen erreichen ein sehr hohes Lebensalter. Trotz des medizinischen Fortschritts und verbesserter Lebenslagen müssen viele alte Menschen körperliche, psychische und soziale Einschränkungen bewältigen. Es ist eine große gesundheits- und sozialpolitische Herausforderung, diese alten Frauen und Männer mit gesundheitlichen Beeinträchtigungen in ihrem Bestreben nach einer weitestgehend autonomen Lebensgestaltung zu unterstützen und zu stärken. Vor diesem Hintergrund widmete sich der Forschungsverbund „Autonomie trotz Multimorbidität im Alter“ (AMA I) der Leitfrage, inwieweit eine selbstbestimmte Lebensgestaltung alter mehrfach erkrankter Menschen erhalten werden kann. Um der Vielfalt der Lebenswelten älterer Menschen gerecht zu werden, wurden im Alltag wenig eingeschränkte und pflegebedürftige sowie kognitiv beeinträchtigte Personen in die Untersuchung einbezogen. Darunter waren Frauen und Männer, die noch im eigenen Haushalt und solche die im Pflegeheim lebten. Im Fokus der Untersuchungen standen die Ressourcen, die den alten Menschen in ihrer jeweiligen Lebenssituation zur Verfügung standen und die Frage, wie diese gestärkt werden können. Der Beitrag präsentiert Ergebnisse zu dieser Forschungsfrage aus der 1. Förderphase des AMA-Verbundes. Darauf aufbauend werden in einer 2. Förderphase (2011–2013, AMA II) nunmehr nachhaltige praxisrelevante Interventionen zur Mobilisierung von autonomierelevanten Ressourcen mehrfach erkrankter alter Menschen entwickelt und auf ihre Praxistauglichkeit getestet. Y1 - 2011 UR - https://www.springermedizin.de/autonomie-trotz-multimorbiditaet-im-alter-der-berliner-forschung/8375302 IS - Sonderheft 2 SP - 9 EP - 25 PB - Springer ER - TY - JOUR A1 - Scheidt-Nave, Christa A1 - Richter, Stefanie A1 - Fuchs, Judith A1 - Kuhlmey, Adelheid T1 - Herausforderungen an die Gesundheitsforschung für eine alternde Gesellschaft am Beispiel "Multimorbidität" JF - Bundesgesundheitsblatt – Gesundheitsforschung – Gesundheitsschutz N2 - Indem ein wachsender Anteil der Bevölkerung ein hohes Alter erreicht, ändern sich Krankheitsspektrum und Versorgungsbedarf. Besondere Herausforderungen für das Gesundheitssystem ergeben sich durch Mehrfacherkrankung (Multimorbidität) älterer Menschen. Im Gegensatz zu krankheitsspezifischen Endpunkten treten Funktion im Alltag und subjektive Ergebnisdimensionen wie selbstbestimmte Lebensführung (Autonomie), soziale Teilhabe und Lebensqualität als Präventions- und Behandlungsziel in den Vordergrund. Die Gesundheitsforschung hat die Aufgabe, auf die Bedürfnisse spezifischer Zielgruppen alter Menschen abgestimmte Präventions- und Versorgungsmodelle zu entwickeln. Entscheidend dabei ist die Stärkung von personalen, sozialen und organisatorischen Ressourcen. Voraussetzung hierfür sind genaue Kenntnisse zur Entwicklung und zum Verlauf des Krankheitsgeschehens und zu zentralen Einflussfaktoren auf der Grundlage epidemiologischer Beobachtungsstudien. Gezielte Maßnahmen sind in Interventions- und Evaluationsstudien auf Wirksamkeit, Wirkung und Wirtschaftlichkeit zu überprüfen. Der vom Bundesministerium für Bildung und Forschung (BMBF) initiierte Förderungsschwerpunkt „Gesundheit im Alter“ fördert insgesamt sechs Forschungsverbünde zum Thema Multimorbidität, die hier kurz vorgestellt werden. Y1 - 2010 UR - https://edoc.rki.de/handle/176904/857 VL - 53 IS - 5 SP - 441 EP - 450 ER - TY - CHAP A1 - Richter, Stefanie A1 - Kuhlmey, Adelheid ED - Tesch-Römer, Clemens T1 - Alter, Altern und Gesundheit als Herausforderung für Forschung in Verbundzusammenhängen BT - Ressourcen für Selbstständigkeit und Selbstbestimmung im Alter T2 - Autonomie trotz Multimorbidität N2 - Angesichts der zunehmenden Alterung der Bevölkerung wird die Frage nach dem Erhalt von Autonomie alter Menschen trotz Mehrfacherkrankungen immer brisanter. Die Beiträge in diesem Band beschäftigen sich mit der Frage, wie alte Menschen trotz Multimorbidität und Gesundheitseinbußen autonom und selbstbestimmt leben können.Die Autoren präsentieren Befunde, die den Entwicklungsstand altersangemessener, zielgruppenspezifischer Instrumente sowie Zugangswege zur Erfassung von Multimorbidität und Autonomie aufzeigen. Weitere Beiträge thematisieren u.a. personale, preofessionelle und sozial-räumliche Faktoren, die Autonomie angesichts von Multimorbidität unterstützen und als Ressourcen wirken. Wie diese Ressourcen einzeln und in ihrer Wechselbeziehung zum Autonomieerhalt beitragen, wie sie erhalten und gefördert werden können, wird beispielhaft im Kontext komplexer autonomierelevanter Gesundheitsprobleme wie Schmerz, Sturz- und Schlafstörungen gezeigt. Y1 - 2012 UR - https://www.hogrefe.com/de/shop/autonomie-trotz-multimorbiditaet-66162.html SP - 203 EP - 220 PB - Hogrefe ER - TY - JOUR A1 - Richter, Stefanie A1 - Flick, Uwe A1 - Kuhlmey, Adelheid T1 - Alter(n) und Gesundheit. Chancen und Hürden einer disziplinenübergreifenden Zusammenarbeit JF - G+G Wissenschaft N2 - Eine umfassende theoretische und empirische Auseinandersetzung mit Fragestellungen und Problemen des Alter(n)s setzt eine inter- beziehungsweise transdisziplinäre Wissenschaftspraxis voraus. Deren Realisierung stößt allerdings immer wieder an Grenzen, denn eine disziplinenübergreifende Zusammenarbeit steht einem Wissenschaftssystem gegenüber, dem Ausdifferenzierung, Abgrenzung, Spezialisierung und die Bildung disziplinenspezifischer Kulturen anhaften. Hinzu kommen Publikationsstrukturen mit den Regeln eines akademischen Karrieremarktes, der eine enge (sub)disziplinäre Fokussierung belohnt. Der Beitrag beleuchtet die Probleme und Lösungsstrategien der disziplinenübergreifenden Zusammenarbeit in der Gerontologie am Beispiel des Forschungsverbundes "Gesundheit im Alter" KW - Gerontologie KW - Gesundheit im Alter KW - Interdisziplinarität KW - Transdisziplinarität KW - Wissensintegration Y1 - 2011 UR - https://www.wido.de/fileadmin/Dateien/Dokumente/Publikationen_Produkte/GGW/wido_ggw_0211_richter_et_al.pdf VL - 11 IS - 2 SP - 7 EP - 15 PB - GGW ER - TY - CHAP A1 - Müller, Max A1 - Rück, Thomas A1 - Jobst, Simon A1 - Pangerl, Jonas A1 - Bierl, Rudolf A1 - Matysik, Frank-Michael T1 - Creating a Digital Twin of a Photoacoustic Gas Sensor for Methane Detection in Complex Gas Matrices T2 - Proceedings Optical Sensors and Sensing Congress 2022 (AIS, LACSEA, Sensors, ES): 11–15 July 2022, Vancouver, British Columbia, Canada N2 - We present the calculation results from a digital twin (DT) of our photoacoustic (PA) sensor for methane detection, regarding gas composition, temperature and pressure variations. Y1 - 2022 SN - 978-1-957171-10-4 U6 - https://doi.org/10.1364/LACSEA.2022.LW4D.2 PB - Optica Publishing Group ER - TY - JOUR A1 - Peter, Daniel A1 - Holsteyns, Frank A1 - Dalmer, Michael A1 - Kruwinus, Hans A1 - Lechner, Alfred A1 - Bensch, Wolfgang T1 - A Study on the Structure Collapse Mechanisms for High Aspect Ratio Structures with Application to Clean Processing JF - ECS Meeting Abstracts Y1 - 2009 U6 - https://doi.org/10.1149/MA2009-02/24/2084 VL - MA2009-02 IS - 24 PB - IOP Science ER - TY - CHAP A1 - Skornia, Christoph ED - Lang, Michael ED - Löhr, Hans ED - Angermeier, Daniel T1 - Sicherheit in der Cloud T2 - IT-Sicherheit Y1 - 2022 SN - 978-3-446-47223-5 U6 - https://doi.org/10.3139/9783446473478.015 SP - 263 EP - 278 PB - Hanser CY - München ER - TY - CHAP A1 - Schreiner, Rupert A1 - Mulot, M. A1 - Wiedmann, Jörg A1 - Coenning, W. A1 - Porsche, J. A1 - Gentner, Jean-Louis A1 - Berroth, Manfred A1 - Scholz, Ferdinand A1 - Schwizer, H. T1 - Dynamic measurements on narrow linewidth complex coupled 1.55 μm DFB lasers with gain and index grating in antiphase T2 - Conference Proceedings. Eleventh International Conference on Indium Phosphide and Related Materials (IPRM'99), 16-20 May 1999, Davos, Switzerland N2 - We report on dynamic measurements on antiphase complex coupled 1.55 /spl mu/m DFB lasers. The antiphase complex coupling mechanism is realized by periodically etching the active layer and quarternary InGaAsP overgrowth. This new fabrication approach results in very narrow linewidths measured on devices with rather short resonator lengths. The minimum linewidth for a 375 /spl mu/m long ridge waveguide laser was only 250 kHz at an optical output power of 4 mW. The RC-limited 3dB-bandwidth for those devices was /spl sim/6 GHz. Using circuit model corrections, the intrinsic bandwidth limitation of those lasers was found to be 17.4 GHz. KW - Waveguide lasers KW - Optical resonators KW - Optical waveguides KW - Laser modes KW - Optical coupling KW - Etching KW - Optical device fabrication KW - Length measurement KW - Power lasers KW - Power generation Y1 - 1999 SN - 0-7803-5562-8 U6 - https://doi.org/10.1109/ICIPRM.1999.773626 SP - 25 EP - 28 PB - IEEE CY - Piscataway ER - TY - CHAP A1 - Schreiner, Rupert A1 - Naegele, Peter A1 - Koerbl, Michael A1 - Groening, Albert A1 - Gentner, Jean-Louis A1 - Schweizer, Heinz C. ED - Mirin, Richard P. ED - Menoni, Carmen S. T1 - Monolithically integrated tunable laterally-coupled distributed feedback lasers with self-aligned Ti/Pt/Au ohmic contacts T2 - Proceedings Volume 4871, Semiconductor Lasers and Optical Amplifiers for Lightwave Communication SystemsSemiconductor Lasers and Optical Amplifiers for Lightwave Communication Systems N2 - We present a new method for fabrication of tunable InGaAsP-InP single mode lasers without epitaxial overgrowth. These devices show the advantage of a considerably simplified fabrication process compared to conventional tunable laser types. The lasers comprise an active Bragg reflector integrated with an uncorrugated separately pumped gain region. To overcome the extensive and expensive overgrowth step we realized a surface grating on both sides of the ridge mesa, which provides DFB operation. By adjusting the current through the Bragg reflector, the wavelength can be tuned between 1590.8 nm and 1595.2 nm. A maximum of 11 wavelength channels with an average spacing of ~0.5 nm and a constant optical output power of ~0.5 mW are addressable. Y1 - 2002 U6 - https://doi.org/10.1117/12.457281 PB - SPIE ER - TY - JOUR A1 - Cheong, Kuan Yew A1 - Aw, Kean A1 - Karimov, Khasan S. A1 - Zhao, Feng A1 - Mahroof-Tahir, Mohammad A1 - Schreiner, Rupert T1 - Advances in Smart Materials and Applications JF - Advances in Materials Science and Engineering N2 - This is one of a series of special issues published in Advances in Materials Science and Engineering, focusing on the latest advances of smart materials and their applications. Evolution of engineering materials is strongly depending on the growing transformation of complexity in engineering products. New materials being designed are required to provide specific properties and demonstrate certain functional characteristics by manipulating their dimension, chemistry, and structure through various advanced technologies. Therefore, “smartness” of a material has become the topic of interest. Properties of smart materials may change accordingly to the applied external stimuli. Under the direction of the editorial team, we showcase advances of organic and inorganic based smart materials and their applications in areas of specific interest such as energy, environment, and health. A total of 9 articles are published in this special issue. Six articles are focused on production, synthesis, and optimization of smart materials; and the remaining are dedicated to application of smart materials. Y1 - 2014 U6 - https://doi.org/10.1155/2014/517342 PB - Hindawi ER - TY - CHAP A1 - Saravanan, Brem Kumar A1 - Gerlach, Philipp A1 - Peschke, Martin A1 - Knoedl, Thomas A1 - Schreiner, Rupert A1 - Hanke, Christian A1 - Stegmueller, Bernhard T1 - Integrated DFB laser electro-absorption modulator based on identical MQW-double stack active layer for high-speed modulation beyond 10 GBIT/S T2 - 16th IPRM. 2004 International Conference on Indium Phosphide and Related Materials, 31 May - 04 June 2004, Kagoshima, Japan N2 - Integrated DFBLD-EAM-SOA devices utilizing an identical MQW active region have been realized in the AlGaInAs/InP material system. A fiber-coupled optical power of >6 mW with a 10 dB static extinction, 44 dB SMSR single-mode spectrum and a 3 dBe cutoff frequency of 25 GHz was measured. KW - Quantum well devices KW - Fiber lasers KW - Indium phosphide KW - Optical materials KW - Optical fiber devices KW - High speed optical techniques KW - Optical modulation KW - Cutoff frequency KW - Power measurement KW - Frequency measurement Y1 - 2004 SN - 0-7803-8595-0 U6 - https://doi.org/10.1109/ICIPRM.2004.1442656 SP - 236 EP - 238 PB - IEEE ER - TY - JOUR A1 - Zahner, Th A1 - Schreiner, Rupert A1 - Stierstorfer, R. A1 - Kus, O. A1 - Li, S. T. A1 - Roessler, R. A1 - Pedarnig, J. D. A1 - Bäuerle, D. A1 - Lengfellner, H. T1 - Off-diagonal Seebeck effect and anisotropic thermopower in Bi2Sr2CaCu2O8 thin films JF - Europhysics Letters N2 - The anisotropy ΔS of the thermopower in thin films of the high-Tc superconductor Bi2Sr2CaCu2O8 is investigated using off–c-axis epitaxial film growth and the off-diagonal Seebeck effect. The measurements represent a new method for the investigation of anisotropic transport properties in solids, taking advantage of the availability of oriented grown crystalline thin films instead of using bulk crystals. First results for the temperature dependence ΔS(T) in Bi2Sr2CaCu2O8 thin films are presented and described within a two-band model. Subjecting the films to heat treatments in different gases at relatively low temperatures, ΔS could reversibly be changed in a wide range. Y1 - 1997 U6 - https://doi.org/10.1209/epl/i1997-00521-4 VL - 40 IS - 6 SP - 673 EP - 678 PB - IOP Sciences ER - TY - CHAP A1 - Knodl, Thomas A1 - Hanke, Christian A1 - Saravanan, Brem Kumar A1 - Peschke, Martin A1 - Schreiner, Rupert A1 - Stegmuller, Bernhard ED - Righini, Giancarlo C. ED - Honkanen, Seppo T1 - Integrated 1.3-μm InGaAlAs-InP laser-modulator with double-stack MQW layer structure T2 - Proceedings Volume 5451, Integrated Optics and Photonic Integrated Circuits N2 - We present first experimental results of the successful transfer of our monolithic integrated double-stack multi quantum well laser-modulator approach from the traditional InGaAsP/InP to the more promising InGaAlAs/InP material system. In continuous wave operation at room temperature, the devices achieved threshold currents of <21 mA, fiber coupled optical power levels up to 570 μW and static extinction ratios in the range of 15 dB/V. The measured small-signal modulation bandwidth of about 10 GHz is capacitance limited due to a conservative device layout. Y1 - 2004 U6 - https://doi.org/10.1117/12.544610 PB - SPIE ER - TY - CHAP A1 - Schreiner, Rupert A1 - Grabeldinger, H. A1 - Wiedmann, J. A1 - Wunstel, K. A1 - Porsche, J. A1 - Scholz, Ferdinand A1 - Schweizer, H. T1 - Complex coupled 1.55 mu m tunable super-grating DFB lasers and photonic filters T2 - Compound semiconductors 1999 : proceedings of the Twenty-Sixth International Symposium on Compound Semiconductors held in Berlin, Germany, 22 - 26 August 1999 N2 - We report on the investigation and realization of photonic filters based on the combination of fractional compositions of a few basic grating periods. Using a minimum set of two basic periods Lambda(1) and Lambda(2) we demonstrate comb-like few mode photonic band gap structures with arbitrary numbers of bands and frequency spacing between the bands. Optically integrated filters of different comb periods result in switchable wavelength filters for channel selection in WDM applications. Y1 - 2000 UR - https://www.researchgate.net/publication/296464112_Complex_coupled_155_mu_m_tunable_super-grating_DFB_lasers_and_photonic_filters SN - 0-7503-0704-8 PB - Inst. of Physics Publ. CY - Bristol [u.a.] ER - TY - CHAP A1 - Schreiner, Rupert A1 - Schweizer, Heinz C. T1 - High frequency operation of 1.57 μm laterally gain coupled DFB lasers with self aligned ohmic contacts and nickel surface gratings T2 - IEEE 18th International Semiconductor Laser Conference; 29 Sept.-3 Oct. 2002, Garmisch, Germany N2 - Laterally coupled DFB lasers with self-aligned ohmic contacts show the advantage of a, considerably simplified fabrication process. Side-mode-suppresion-ratios up to 55 dB and 3 dB-bandwidths beyond 15 GHz were obtained for these devices. KW - Frequency KW - Optical coupling KW - Distributed feedback devices KW - Etching KW - Laser theory KW - Laser modes KW - Nickel KW - Laser feedback KW - Waveguide lasers KW - Laser noise Y1 - 2002 SN - 0-7803-7598-X U6 - https://doi.org/10.1109/ISLC.2002.1041099 SP - 21 EP - 22 PB - IEEE ER - TY - INPR A1 - Müller, Max A1 - Weigl, Stefan A1 - Müller-Williams, Jennifer A1 - Lindauer, Matthias A1 - Rück, Thomas A1 - Jobst, Simon A1 - Bierl, Rudolf A1 - Matysik, Frank-Michael T1 - Ambient methane monitoring at Hohenpeißenberg utilizing photoacoustic spectroscopy and cavity ring down spectroscopy N2 - With an atmospheric concentration of approximately 2000 parts per billion (ppbV, 10−9) methane (CH4) is the second most abundant greenhouse gas (GHG) in the atmosphere after carbon dioxide (CO2). The task of long-term and spatially resolved GHG monitoring to verify whether climate policy actions are effective, is becoming more crucial as climate change progresses. In this paper we report the CH4 concentration readings of our photoacoustic (PA) sensor over a five day period at Hohenpeißenberg, Germany. As a reference device a calibrated cavity ringdown spectrometer Picarro G2301 from the meteorological observatory was employed. Trace gas measurements with photoacoustic instruments promise to provide low detection limits at comparably low costs. However, PA devices are often susceptible to cross-sensitivities related to environmental influences. The obtained results show that relaxation effects due to fluctuating environmental conditions, e.g. ambient humidity, are a non-negligible factor in PA sensor systems. Applying algorithm compensation techniques, which are capable of calculating the influence of relaxational effects on the photoacoustic signal, increase the accuracy of the photoacoustic sensor significantly. With an average relative deviation of 1.11 % from the G2301, the photoacoustic sensor shows good agreement with the reference instrument. Y1 - 2023 U6 - https://doi.org/10.5194/egusphere-2023-1010 ER - TY - JOUR A1 - Denk, Alexander A1 - Schüngel, Verena A1 - Weber, Stefka A1 - Kaulen, Corinna T1 - Heimexperiment und Online-Dokumentation : Praktische Ausbildung in den MINT-Fächern JF - Chemie in unserer Zeit N2 - Die Anleitung zum selbständigen wissenschaftlichen Arbeiten ist ein fester Bestandteil in der naturwissenschaftlichen Ausbildung, der im letzten Jahr durch Distanz‐Unterricht stark vernachlässigt wurde. Wir stellen hier einen Ansatz vor, bei dem Studierende zu Hause mit Alltagsgegenständen in Teilaufgaben die Aktivität von Hefe in Abhängigkeit von Temperatur und Substrat untersucht haben. Die Ergebnisse des gesamten Kurses wurden in einem Google‐Dokument gesammelt und zentral ausgewertet. Gleichzeitig fand ein Erfahrungsaustausch unter den Lernenden statt und Probleme konnten öffentlich diskutiert werden. Darüber hinaus wurden grundlegende Fähigkeiten wie Beobachten, Protokollieren und detailgetreues Berichten geübt. Die Online‐Dokumentation und ‐Erfassung der Ergebnisse stellt somit eine geeignete Methode dar, die Durchführung von Heimexperimenten zu aktivieren und zu koordinieren. N2 - Instruction in independent scientific work is an integral part of science education that has been severely neglected in the past year due to distance teaching. Here, we present an approach in which students used everyday objects to investigate the activity of yeast as a function of temperature and substrate in subtasks at home. The results of the whole course were collected in a Google document and centrally analyzed. At the same time, the learners were asked to upload their experimental reports with photos to a wiki. This enabled an exchange of experiences among the learners and problems could be discussed publicly. Furthermore, basic skills like observing, logging and detailed reporting were practiced. Online documentation and recording of results is thus a suitable method to activate and coordinate the implementation of home experiments. Y1 - 2023 U6 - https://doi.org/10.1002/ciuz.202100018 PB - Wiley-VCH ER - TY - JOUR A1 - Pourshahidi, Ali Mohammad A1 - Jean, Neha A1 - Kaulen, Corinna A1 - Jakobi, Simon A1 - Krause, Hans-Joachim T1 - Impact of Particle Size on the Nonlinear Magnetic Response of Iron Oxide Nanoparticles during Frequency Mixing Magnetic Detection JF - Sensors N2 - Magnetic nanoparticles (MNPs), particularly iron oxide nanoparticles (IONPs), play a pivotal role in biomedical applications ranging from magnetic resonance imaging (MRI) enhancement and cancer hyperthermia treatments to biosensing. This study focuses on the synthesis, characterization, and application of IONPs with two different size distributions for frequency mixing magnetic detection (FMMD), a technique that leverages the nonlinear magnetization properties of MNPs for sensitive biosensing. IONPs are synthesized through thermal decomposition and subsequent growth steps. Our findings highlight the critical influence of IONP size on the FMMD signal, demonstrating that larger particles contribute dominantly to the FMMD signal. This research advances our understanding of IONP behavior, underscoring the importance of size in their application in advanced diagnostic tools. KW - frequency mixing magnetic detection KW - magnetic nanoparticles KW - magnetic particle spectroscopy KW - magnetic biosensing KW - thermal decomposition KW - iron oxide nanoparticles KW - MNP characterization Y1 - 2024 U6 - https://doi.org/10.3390/s24134223 SN - 1424-8220 VL - 24 IS - 13 PB - MDPI CY - Basel ER - TY - INPR A1 - Schwarz, Tobias A1 - Pastötter, Angelina A1 - Tran, Trung A1 - Schlosser, Marc A1 - Kaulen, Corinna A1 - Lechner, Alfred A1 - Kammler, Martin A1 - Slabon, Adam T1 - Effect of Temperature on the Growth of Cu(I)O Nanocubes: The Impact of the Copper Precursor Species T2 - SSRN N2 - Cuprous oxide (Cu2O) nanoparticles were synthesized using a wet chemical surfactant free method at different synthesis temperatures from 25 ◦C to 60 ◦C. Morphology, size, and chemical composition of the prepared Cu2O nanoparticles were analyzed by SEM, PXRD, and ATR-IR. We discovered that the chemical composition of the Cu2O nanoparticles remained unaffected by the synthesis temperature. However, morphology and size of the nanoparticles showed a strong temperature dependency. This could be attributed to the temperature induced formation of cupric oxide (CuO) species from the copper hydroxide (Cu(OH)2 ) precursor which also functions as copper precursor for the Cu2O nanoparticle growth. The cupric oxide species was determined to be the main cause for the formation of micrometer sized particles, whereas with the Cu(OH)2 precursor species for the Cu2O nanoparticles nanocubes with smaller edge lengths as well as octahedrons were obtained. KW - nanoparticle KW - Copper oxide KW - crystal growth KW - Crystal structure Y1 - 2024 U6 - https://doi.org/10.2139/ssrn.4909639 PB - Elsevier ER - TY - INPR A1 - Steffens, Oliver T1 - Binomial Distribution Nomogram after Larson N2 - Following an idea of Larson (1966) we construct a nomogram for cumulative binomial distribution that can be used to perform hypothesis testing, quality management (e.g. test design) and other statistical tasks. The nomogram can be printed and directly used with a simple ruler to read the results. It is instructive and as an analog computing device continuous changes are easily visible. Y1 - 2024 UR - https://www.researchgate.net/publication/383270775_Binomial_Distribution_Nomogram_after_Larson ER - TY - CHAP A1 - Höller, Christoph A1 - Blödt, Adrian ED - Rolfes, Raimund ED - Peissig, Jürgen T1 - Praxisnahe, projektbasierte Lehre in der Bauakustik mit Hilfe von realen Bauobjekten T2 - Tagungsband - Proceedings "Fortschritte der Akustik - DAGA 2024" : DAGA 2024 - 50. Jahrestagung für Akustik, 18.-21. März 2024, Hannover N2 - Im Rahmen des Masterstudiengangs Bauingenieurwesen können Studierende der Ostbayerischen Technische Hochschule Regensburg einen Wahlpflichtkurs zu fortgeschrittener Bauphysik belegen, um ihr Wissen über Wärme- und Feuchteverhalten, Energieeffizienz von Gebäuden sowie Raum- und Bauakustik zu vertiefen. Im letzten Jahr wurde dieser Kurs von einer klassischen Frontalvorlesung auf eine interaktivere und praxisnähere Unterrichtsform umgestellt. Im Fokus stehen nun Gruppenarbeiten und projektbasiertes Lernen mit realen Bauprojekten. Für den Bauakustik-Teil wurde ein kürzlich errichtetes Mehrfamilienhaus in Holzbauweise als Beispielobjekt verwendet. Die Studierenden wurden in fünf Gruppen eingeteilt, die sich jeweils mit einem Aspekt des akustischen Planungsprozesses befassten: Luft- und Trittschalldämmung, Raumakustik, Fassadenschalldämmung, Geräusche von gebäudetechnischen Anlagen sowie Immissionsschutz. Jede Gruppenaufgabe war so konzipiert, dass sie Berechnungen und messtechnische Aspekte enthielt. Die Studierenden wurden durch ausgewählte Vorlesungen, Kleingruppenbetreuung und einen abschließenden "Messtag" unterstützt. Am Ende des Semesters präsentierte jede Gruppe die für die Projektaufgaben verwendeten Methoden und die Ergebnisse. Die ersten Rückmeldungen der Studierenden sind positiv, das Engagement hat spürbar zugenommen. Der praxisorientierte Ansatz impliziert, dass die Studierenden mit realen Herausforderungen konfrontiert werden, wie beispielsweise unbekannten oder fehlerhaften Daten, anspruchsvollen Messgeräten oder komplexen Vorschriften. Sie lernen, wie sie mit diesen Herausforderungen umgehen können. In diesem Beitrag werden Einzelheiten des Projekts und die bisher gesammelten Erfahrungen vorgestellt. Y1 - 2024 UR - https://pub.dega-akustik.de/DAGA_2024/konferenz?article=321 UR - https://pub.dega-akustik.de/DAGA_2024/ SN - 978-3-939296-22-5 SP - 826 EP - 828 ER - TY - CHAP A1 - Podstránský, Jáchym A1 - Hausladen, Matthias A1 - Zlámal, Jakub A1 - Knápek, Alexandr A1 - Schreiner, Rupert T1 - Single Column Multiple Electron Beam Imaging from N-Type Silicon T2 - 37th International Vacuum Nanoelectronics Conference (IVNC), 15-19 July 2024, Brno, Czech Republic N2 - This work is aimed at measuring the electron emission from multiple cathodes formed by n-doped silicon and imaging the electron beams focused by an einzel lens on a CMOS camera. The experimental results are compared with computer simulation to understand the electron emission from the semiconductor cathode and the observed imaging imperfections. Finally, modifications to the experimental setup are suggested that should lead to improvement in the extraction current and spot size of focused electron beams and also better understanding of the processes taking place in the experiment. Y1 - 2024 SN - 979-8-3503-7976-1 U6 - https://doi.org/10.1109/IVNC63480.2024.10652470 SP - 1 EP - 2 PB - IEEE ER - TY - CHAP A1 - Höller, Christoph A1 - Müller-Trapet, Markus T1 - Measured and predicted sound transmission through a laboratory concrete floor T2 - 53rd International Congress and Exposition on Noise Control Engineering (Inter-Noise 2024), 25.-29. August 2024, Nantes France Y1 - 2024 ER - TY - CHAP A1 - Rieger, Anna A1 - Däuble, Lukas A1 - Scheck, Jochen A1 - Zeitler, Berndt A1 - Höller, Christoph T1 - Experimental study on using transient excitation signals in the prediction of sound pressure levels from building services according to EN 12354-5 and EN 15657 T2 - Proceedings of DAS|DAGA 2025, 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen N2 - EN 12354-5:2023 describes a calculation procedure to predict the sound pressure levels from building service equipment. The procedure uses the blocked force of the source as input data. This quantity can be determined using the reception plate method according to EN 15657:2017. The methods have been developed and validated for stationary excitation signals (Leq). Real structure-borne sound sources often have time-varying excitation signals. In addition, the requirements for sound insulation against noise from building service equipment in Germany (DIN 4109) are given in terms of the maximum, time-weighted sound pressure level (LFmax). This contribution investigates the suitability of the methods described in EN 12354-5 and EN 15657 for structure-borne sound sources with transient excitation signals. A measurement series with time signals ranging from stationary to highly transient was conducted in a building-like laboratory. The reverberation time of the receiving room was adjusted to three different values. The calculations were processed using Leq values, LFmax values and short-time Leq values. The results show the uncertainties that can arise in the prediction of signals with varying transient characteristics compared to stationary excitation signals. Y1 - 2025 SN - 978-3-939296-23-2 U6 - https://doi.org/10.71568/dasdaga2025.526 SP - 372 EP - 375 CY - Berlin ER - TY - CHAP A1 - Höller, Christoph A1 - Parzinger, Michael A1 - Schanda, Ulrich T1 - The Sound Reduction Index of Homogeneous Building Elements according to Annex B of ISO 12354-1 – Discussion and Proposal for Changes T2 - Proceedings of DAS|DAGA 2025, 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen N2 - Annex B of ISO 12354-1:2017 describes a procedure for the calculation of the frequency-dependent sound reduction index of homogeneous building elements such as concrete floors or masonry walls. With the introduction of EN 12354-5:2023 and an upcoming change in DIN 4109-2 regarding the calculation of sound levels due to service equipment, it is anticipated that the practical relevance and usage of Annex B will increase in the future. For this reason, the procedure has recently been investigated by an informal working group of academics from several German universities. It was found that Annex B contains some errors, missing references, and ambiguities in the calculation procedure. Based on these discussions, some changes were proposed to the committee responsible for the standard (CEN/TC 126/WG 2). While the general calculation procedure was left unchanged, the proposed changes focus on the influence of shear deformation, the radiation factor for free waves, a moving average function to limit the variability in the coincidence region, and the calculation examples provided in the annex. This contribution provides an overview of the procedure, presents some background information on the underlying theory, and discusses the proposed changes. Y1 - 2025 SN - 978-3-939296-23-2 U6 - https://doi.org/10.71568/dasdaga2025.147 SP - 312 EP - 315 CY - Berlin ER - TY - CHAP A1 - Bäumler, Georg A1 - Höller, Christoph T1 - Modifying a Wall Transmission Suite to Measure Diffuse Field Sound Absorption Coefficients – A Case Study T2 - Proceedings of DAS|DAGA 2025, 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen N2 - The determination of the diffuse field sound absorption coefficient is carried out in reverberation chambers that comply with the requirements of the corresponding standard, ISO 354. No such chamber exists at OTH Regensburg University of Applied Sciences, but a new wall transmission suite according to ISO 10140 is available. This student project investigates the possibility of using the wall transmission suite to measure absorption coefficients for teaching and research purposes.To assess the suitability of the room, the diffusivity was evaluated using the standard deviation of both the reverberation times and the equivalent continuous sound pressure levels at multiple positions within the room. These results, along with a comparison with expected values for a diffuse sound field, guided the design of reflector panels to introduce diffuse reflections. The implementation features acrylic (PMMA) as the primary material in combination with dense viscoelastic damping sheets, resulting in a low vibration solution. Suspended from the ceiling of the chamber, these improved the diffusivity of the sound field, making the room suitable for absorption measurements across a broad frequency range. Y1 - 2025 SN - 978-3-939296-23-2 U6 - https://doi.org/10.71568/dasdaga2025.291 SP - 1191 EP - 1194 CY - Berlin ER - TY - RPRT A1 - Bresinsky, Markus A1 - Petzke, Jan T1 - Russland 2030+ BT - Wege in eine ungewisse Zukunft N2 - Der Bericht "Russland 2030+: Wege in eine ungewisse Zukunft" präsentiert mögliche Szenarien für die politische, wirtschaftliche, militärische und gesellschaftliche Entwicklung Russlands bis über das Jahr 2030 hinaus. Er basiert auf einem interdisziplinären Ansatz und verwendet Foresight-Methoden, darunter eine PMESII-Analyse. Diese wurde von Studierenden der OTH Regensburg unter Leitung von Prof. Dr. Markus Bresinsky in Zusammenarbeit mit Vertretern der Bundeswehr durchgeführt. Der Bericht stellt fünf Zukuntsbilder vor, die sich jeweils auf unterschiedliche Schlüsselfaktoren und Annahmen stützen: von einer Fortführung der autoritären Herrschaft (Putin's Tsardom) über gewaltsame Machtwechsel (Moscow Meltdown) bis hin zur zunehmenden Abhängigkeit von China (Dragon eats Bear). Ziel der Untersuchung ist es, mögliche Entwicklungen und deren Implikationen für internationale Akteure aufzuzeigen, um eine fundierte Entscheidungsgrundlage für vorausschauendes Handeln zu schaffen. Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-78395 PB - OTH Regensburg ER - TY - CHAP A1 - Neugart, Sandrine A1 - Bresinsky, Markus T1 - Situational Awareness of Critical Infrastructures at the Local Level – Fostering Resilience Through Accessible Method-based Analysis T2 - Critical Infrastructure Protection and Resilience Europe (CIPRE) 2022, Bukarest (Rumänien) N2 - Critical infrastructure protection and resilience start at the local level. While laws and regulations provide the necessary frameworks within which the various stakeholders act, little effort has been made to bring together local and regional actors in order to facilitate a shared understanding of critical infrastructure (CI) risks and security. Such a common analysis, however, is essential to identifying local vulnerabilities, understanding their key drivers as well as their interdependencies, and ultimately, to adapting strategies which overall contribute to improving the security of KRITIS in the region. This paper outlines a best practice approach to analyzing risks associated with KRITIS and their interdependencies at the local level. It addresses frequently overlooked issues such as bringing together different stakeholders whilst making the discussion accessible and comprehensible to everyone. It also deals with analytic questions regarding the development of a methods-based approach to situational awareness, ranging from defining appropriate categories of thinking to mitigating the impact of potential biases influencing the different thought processes. In order to advance these ideas, the analysis is based on thorough research as well as first-hand experience from running local workshops for stakeholders of KRITIS. Overall, this paper seeks to develop a format which encourages action among KRITIS stakeholders at the local level. It approaches critical infrastructures from a system thinking perspective, whilst linking intellectual accessibility with the rigor of academic analysis. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-55676 ER - TY - GEN A1 - Bresinsky, Markus A1 - Hager, Eva A1 - Xanthos, George T1 - ChatGPT for futures: how large language models can support the development of future scenarios using the Cone of Plausibility T2 - CCEW SYMPOSIUM 2024: Predictive Synergies: Crisis Early Warning & Foresight, 19. und 20. September 2024, München N2 - Recently, large language models (LLMs), such as the “Chat Generative Pre-trained Transformer”, commonly known as ChatGPT, are substantially impacting the world of (big) data analytics and artificial intelligence. This paper explores how ChatGPT-4 can be used to support the development of future scenarios using the Cone of Plausibility method. The most recent version ChatGPT 4.0 differs from its predecessors in that it can now access real-time data to generate its responses. This makes it an attractive tool for intelligence analysts, who are faced with the permanent challenge of having to sift through large amounts of data whilst also providing actionable products in a timely manner. Previous versions of ChatGPT were prone to errors such as making up information. But what if, using the right prompts, version 4.0 could become a useful sparring partner for developing future scenarios? In this study, we will ask ChatGPT 4.0 to generate sets of plausible future scenarios for “Russia 2035+” based on previously specified key drivers and assumptions. The LLM’s potential for error is reduced because it is not working with hypotheses that it has generated itself. This could turn ChatGPT into a quick-thinking sparring partner for imagining varieties of future scenarios, supporting out-of-the box thinking and further minimising cognitive biases. To evaluate the reliability and accuracy of the results generated by ChatGPT, we will use the VV&A concept developed by the US Department of Defence. According to this concept, credibility in an intelligence product is rooted in the verification, validation and accreditation of its analysis. This process is routinely followed by every intelligence analyst. We will have found out to which extent and under which circumstances ChatGPT 4.0 can credibly support the development of future scenarios. Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-77811 ER - TY - CHAP A1 - Reusner, Florian A1 - Pöhner, Miriam A1 - Bresinsky, Markus T1 - The Joint Effort Workshop as a tool for Knowledge Management and competence development T2 - 5th International Conference on Higher Education Advances (HEAd'19): 26.06.2019 - 28.06.2019, Valencia N2 - Cybersecurity is a complex global phenomenon where the risk for individuals, organisation and the society at large are at risk. These risks need to be in focus and solutions for the prevention and developing countermeasures. In this paper, we describe the Joint Effort Workshop as an approach to raise awareness to these threads and the possibility to generate and exchange knowledge between students and experts. We conclude that mechanisms for systematic response to attacks need the developed technical requirements, but foremost human behaviour, knowledge and resilience to response to risks, which can be experienced through the collaborative environment of the Joint Effort Workshop KW - Collaborative Learning KW - Critical Infrastructure KW - Cybersecurity KW - Knowledge Management KW - Organizational Learning KW - Virtual Collaboration Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-26973 SN - 9788490486610 PB - Universitat Politècnica València CY - Valencia ER - TY - GEN A1 - Bresinsky, Markus T1 - Strategic Forecasting with Machine Learning for Geopolitical Analysis Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-25103 ER - TY - CHAP A1 - Bresinsky, Markus A1 - Schroeder, Johanna A1 - Viscardi, Valerio T1 - Asymmetry in Trust Building – different perspectives in gains and losses explained via Prospect Theory T2 - Common Effort Conference, The Hague: 19 – 22 October 2020 N2 - Building trust within conflicts situations is a required process to establish a suitable environment for peace keeping and state building processes. However, it remains unclear what are the best ways to foster trusts between actors in a conflict environment. This study draws insights from the literature on trust and from Kahneman’s Prospect Theory to analyse the decision-making dynamics of the actors involved in a conflict and how these dynamics could affect the trust levels between those actors. To this purpose, the fourfold pattern of preferences I applied to a thought experiments where opposing actors in a conflict in the Sahel face the decision to accept or refuse a peace agreement when either one of the two actors face huge gains or catastrophic losses. The main findings is that, in those extreme situations, the actors involved tend to take unnational decisions that undermine the trust building process in the country. Therefore, it would be recommendable to boost situations where actors are negotiating in a more balanced environment. To this purpose, further research should be conducted on the ways to create such suitable environment for trust building. Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-24778 SP - 1 EP - 9 ER - TY - CHAP A1 - Bresinsky, Markus A1 - Schroeder, Johanna A1 - Viscardi, Valerio T1 - Strategic Forecasting with Machine Learning for Regional Geopolitical Analysis T2 - Η Περιφερειακή Επιστήμη, το μέλλον της και οι προκλήσεις στα πεδία της έρευνας και της εφαρμογής : 21ο Επιστημονικό Συνέδριο του Συνδέσμου Ελλήνων Περιφερειολόγων Ελληνικό Μεσογειακό Πανεπιστήμιο, Ηράκλειο Κρήτης, 16-17 Οκτωβρίου 2020 - Challenges for the Future of Regional Science: Research and Applications; 21st Conference: Heraklion, Crete, Oktober 2020 N2 - Strategic forecasting of regional geopolitical development is important for early warning and contingency planning. Open source data and machine learning can help to identify indicators for effective scenario development. Using data of the Bertelsmann Transformation Index (BTI) and the machine learning software Waikato Environment for Knowledge Analysis (WEKA), this paper gives an insight into the generation of a decision tree to provide indicators for forecasting regional development across parts of Northern and Western Africa. Results show that machine learning with open source data can support redefining indicator development but does not replace critical thinking. Y1 - 2020 UR - https://drive.google.com/file/d/1o2qAxcnq5srRr8r8okibHWwb4O0c69Oz/view SN - 978-618-00-2351-0 SP - 267 EP - 276 ER - TY - JOUR A1 - Bresinsky, Markus T1 - Understanding Hybrid Warfare as Asymmetric Conflict : Systemic Analysis by Safety, Security and Certainty JF - On-line Journal Modelling the New Europe N2 - The emergence of innovative methods and operations in asymmetric conflicts as for example unidentifiable soldiers during the Crimean conflict in 2014 or sophisticated cyberattack against Estonia in 2007 was a trigger for both analysts and scholars to rethink scientific concepts of asymmetric conflict. With introduction of the concept 'hybrid warfare' a new systematic element was established in scientific research. Nevertheless, the concept is discussed rather controversially and often its scientific value is questioned. Most of the literature describes the empirical phenomena of hybrid warfare, but does not provide a theoretical based argumentation. This paper addresses the neglected aspect of systemic analysis by focusing on vulnerability of modern societies and outlines a concept based on the theoretical idea of safety, security and certainty to grasp the underlying driving factors of new forms and methods in asymmetric conflicts. The analysis presented here shows that sociology and system engineering have already developed valuable conceptual definitions of safety, security and certainty that can be used for the analysis of asymmetric conflicts. The missing link, closed by this paper, was an interdisciplinary approach to integrate these concepts into an analysis framework. The findings indicated that the new forms of asymmetric conflicts can be understood as a concise and precise analysis of systemic weaknesses of nation states and their societies. Still, Western European nations focus their security policy mainly on past challenges of war and peace. Therefore, societies of these nations remain highly vulnerable to safety threats and uncertainty. The presented theoretical framework supported this result and should, therefore, be of value to analysts and scientists alike aiming to identify the underlying systemic factors of innovative asymmetric conflict. KW - Certainty KW - Hybrid warfare KW - safety KW - Security KW - Systemic analysis KW - Theoretical framework Y1 - 2016 UR - https://www.proquest.com/scholarly-journals/understanding-hybrid-warfare-as-asymmetric/docview/1872206522/se-2 IS - 21 SP - 29 EP - 51 PB - Babes-Bolyai University ER - TY - CHAP A1 - Bresinsky, Markus A1 - Willner, Sophia ED - Brooks, Anthony L. ED - Brooks, Eva Irene T1 - GLOBE - Digital Literacy and Organizational Learning by Scenario-Driven Exercises T2 - Interactivity, Game Creation, Design, Learning, and Innovation: 8th EAI International Conference, ArtsIT 2019, and 4th EAI International Conference, DLI 2019: Aalborg, Denmark, November 6-8, 2019, Proceedings N2 - Due to rapid technological development and fast-changing working environments, organizations active in such context find themselves facing internal change and adaption processes. Originally prominent among start-up or IT-companies, the use of management concepts to steer such change processes and to increase efficiency also spread among humanitarian organizations preoccupied with crisis management. In this regard, concepts retrieved from the domain of Organization Development offer a great potential to facilitate change processes and to enhance learning among practitioners. The notions of Learning Organization and Quality Management are combined with the theory of Argyris and Schön’s Levels of Learning. This combination then serves as a theoretical decision-making base used in a simulation game at the University of Applied Sciences OTH Regensburg. Within this scenario-driven exercise, Quality Management, virtual collaboration and digital skills are trained. During the simulation game, participants are encouraged to think critically, to utilize new technologies and to apply their problem-solving skills to real-life examples, which ultimately aims at preparing students for a dynamic working environment within the era of digitization. KW - Deming cycle KW - Learning organization KW - Organization development KW - Simulation games KW - Situational awareness KW - Virtual Collaboration Y1 - 2020 SN - 978-3-030-53293-2 U6 - https://doi.org/10.1007/978-3-030-53294-9_51 SP - 671 EP - 682 PB - Springer International Publishing CY - Cham ER - TY - CHAP A1 - Bresinsky, Markus A1 - Willner, Sophia ED - Brooks, Anthony L. ED - Brooks, Eva Irene T1 - GLOBE - Cognitive and Social Competence Development by Virtual Collaboration and Simulation Games T2 - Interactivity, Game Creation, Design, Learning, and Innovation. 8th EAI International Conference, ArtsIT 2019, and 4th EAI International Conference, DLI 2019, Aalborg, Denmark, November 6-8, 2019, Proceedings N2 - This paper first examines a variety of conceptual contemporary challenges and cognitive shortcomings of public policy makers, entrepreneurs and other practitioners in Germany as a knowledge-based economy. Systems thinking, digital competencies and several modern leadership skills are identified as possibilities to meet contemporary challenges in fast changing and complex environments. Modern leadership skills and promising working styles imply the ability to manage agile processes, flexibility and diversity, and the modus operandi as self-organizing networks. After that, the simulation game GLOBE Exercise at the OTH Regensburg is introduced as an innovative and transformative learning method. In its concept, the GLOBE Exercise combines virtual collaboration with Action Learning, and thus contributes to skills development and transfer both concerning digital competencies and analytical skills. KW - Action learning KW - ICT Simulation games KW - Interactive and collaborative learning KW - Leadership Digitization KW - Problem-based learning KW - Systems thinking KW - Virtual Collaboration Y1 - 2019 SN - 978-3-030-06133-3 U6 - https://doi.org/10.1007/978-3-030-06134-0_37 SP - 331 EP - 342 PB - Springer International Publishing CY - Cham ER -