Publikationen

2022

• Parametric optimization and comparative study of an organic Rankine cycle power plant for two-phase geothermal sources

  Chen, C. ., Witte, F. ., Tuschy, I. ., Kolditz, O. ., & Shao, H. . (2022). Parametric optimization and comparative study of an organic Rankine cycle power plant for two-phase geothermal sources. Energy, 123910. http://doi.org/https://doi.org/10.1016/j.energy.2022.123910

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  For two-phase geothermal sources, Organic Rankine Cycle (ORC) based binary plant is often applied for power production. In this work, a network topology is designed with the open-source Thermal Engineering Systems in Python (TESPy) software to simulate the stationary operation of the ORC plant. With this topology, the performance of six different working fluids are compared. From the thermodynamic perspective, the gross and net power output are optimized respectively. Results show that R600 has the highest gross power output of 17.55 MW, while R245fa has the highest net power output of 12.93 MW. However, the turbine inlet temperatures for these two working fluids need to be designed at the upper theoretical limit. R245ca and R601a require the heat exchange rates of internal heat exchanger to be larger than 1.51 MW and 0.99 MW to satisfy the re-injection temperature limit, which are smaller than the R600 (6.7 MW) and R245fa (6.0 MW) cases. Besides, the working fluid with lower critical state is preferred for a geothermal source with smaller steam fraction to establish a stable ORC plant. The workflow for the ORC design and optimization in this work is generic, and can be further applied to thermo-economic investigation.

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    • Witte, Francesco
    • Tuschy, Ilja

  • Profilbereich

    • Erneuerbare Energien und nachhaltige Entwicklung

  • Forschungsfeld

    • Wärme

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2022
  • Journal Article
  • • Chaofan Chen
    • Francesco Witte
    • Ilja Tuschy
    • Olaf Kolditz
    • Haibing Shao
  • • Organic Rankine cycle (ORC)
    • Geothermal power plant
    • Two-phase geothermal sources
    • Design and optimization
    • Thermal engineering systems in python (TESPy)
    • OpenGeoSys (OGS)

• A symbolic framework to obtain mid-fidelity models of flexible multibody systems with application to horizontal-axis wind turbines

  Branlard, E. ., & Geisler, J. . (2022). A symbolic framework to obtain mid-fidelity models of flexible multibody systems with application to horizontal-axis wind turbines. Wind Energy Science, 7, 2351–2371. http://doi.org/10.5194/wes-7-2351-2022

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  The article presents a symbolic framework (also called computer algebra program) that is used to obtain, in symbolic mathematical form, the linear and nonlinear equations of motion of a mid-fidelity multibody system including rigid and flexible bodies. Our approach is based on Kane's method and a nonlinear shape function representation for flexible bodies. The shape function approach does not represent the state of the art for flexible multibody dynamics but is an effective trade-off to obtain mid-fidelity models with few degrees of freedom, taking advantage of the separation of space and time. The method yields compact symbolic equations of motion with implicit account of the constraints. The general and automatic framework facilitates the creation and manipulation of models with various levels of complexity by adding or removing degrees of freedom. The symbolic treatment allows for analytical gradients and linearized equations of motion. The linear and nonlinear equations can be exported to Python code or dedicated software. There are multiple applications, such as time domain simulation, stability analyses, frequency domain analyses, advanced controller design, state observers, and digital twins. In this article, we describe the method we used to systematically generate the equations of motion of multibody systems and present the implementation of the framework using the Python package SymPy. We apply the framework to generate illustrative land-based and offshore wind turbine models. We compare our results with OpenFAST simulations and discuss the advantages and limitations of the method. The Python implementation is provided as an open-source project.

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    • Geisler, Jens

  • Profilbereich

    • Erneuerbare Energien und nachhaltige Entwicklung

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2022
  • Journal Article
  • • E. Branlard
    • Jens Geisler

• Evaluation einer Prostatakrebsnachsorge-App aus Patientensicht: Eine qualitative Studie

  Pornak, S. C., Griemsmann, S. ., Böhle, A. ., Lusch, A. ., Schulte, R. ., & Lehr, B. . (2022). Evaluation einer Prostatakrebsnachsorge-App aus Patientensicht: Eine qualitative Studie. Zeitschrift für Evidenz, Fortbildung Und Qualität Im Gesundheitswesen, 175, 67–75.

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    • Pornak, Shirin Caroline

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  • 2022
  • Journal Article
  • • Shirin Pornak
    • Silke Griemsmann
    • Andreas Böhle
    • Achim Lusch
    • Rainer Schulte
    • Bosco Lehr

• Good Tech and Social Good: Value Creation by Korean Social and High-Tech Oriented Start-Ups

  Berg, S.-H. ., & Mitra, J. . (2022). Good Tech and Social Good: Value Creation by Korean Social and High-Tech Oriented Start-Ups. Volume 8 Issue 1, 8(1), 29–45. Abgerufen von https://EconPapers.repec.org/RePEc:sae:jouent:v:8:y:2022:i:1:p:29-45

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  Through an exploration of Korean high-tech social enterprises, we aim to identify and explore critically (a) how socially engaged, early stage, high technology firms combine social and economic objectives with which to scale up their ventures; and (b) how socially engaged firms seek entrepreneurial opportunity development, including the internationalisation process and the support of stake holding institutions to help scale up the value creation process. We highlight ‘people’, ‘organisations’ and the ‘environment’ dimensions, enabling an understanding of the drivers of socially entrepreneurial activity both from individual and societal perspectives. The analytical framework of our study is based on empirical data acquired from individual in-depth interviews, group interviews, active participatory observations and survey data from 2018 to 2021. We found that social motivation and objectives of the entrepreneurs are equally strong drivers and that they are the principal factors for the scaling up process. The motivation is strengthened by the proactive role of government initiatives which also attract other key stakeholders in the growth process. A combination of digital technology with a high degree of social motivation of the entrepreneurs tends to lead to the development of international market opportunities and attract the interests of international foundations.

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  • Abteilung/Einrichtung

    • Jackstädt-Zentrum Flensburg (JZF)

  • Profilbereich

    • Start-up- und KMU-Management

  • Forschungsfeld

    • Entrepreneurship

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2022
  • Journal Article
  • • Su-Hyun Berg
    • Jay Mitra
  • • Social and technological entrepreneurship
    • high-tech start-ups
    • digital technology
    • South Korea
    • internationalisation

• Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

  Ivannikov, V. ., Thomsen, F. ., Ebel, T. ., & Willumeit-Römer, R. . (2022). Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering. Computational Particle Mechanics. http://doi.org/https://doi.org/10.1007/s40571-022-00486-6

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    • Thomsen, Fritz

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  • 2022
  • Journal Article
  • • Vladimir Ivannikov
    • Fritz Thomsen
    • Thomas Ebel
    • Regine Willumeit-Römer

• Smartphone-assisted psychoeducation in adult attention-deficit/hyperactivity disorder: A randomized controlled trial

  Selaskowski, B. . (2022). Smartphone-assisted psychoeducation in adult attention-deficit/hyperactivity disorder: A randomized controlled trial. Psychiatry Research, 317, 114802. http://doi.org/https://doi.org/10.1016/j.psychres.2022.114802

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  Psychoeducation is generally recommended in the treatment of adult Attention-Deficit/Hyperactivity Disorder (ADHD), but only few studies have systematically assessed the effects of structured clinical psychoeducation. Moreover, although a considerable number of psychoeducational mobile applications exist, none have provided scientific evidence for their effectiveness or safety. Therefore, the present randomized controlled trial investigated a newly developed, free-to-use psychoeducation app for adults with ADHD as a support to a clinical psychoeducation group. 236 adults with ADHD were contacted for study participation, of whom 60 were finally randomized to a psychoeducation group supported either by our developed smartphone app (n = 30) or by traditional pen-and-paper brochures (n = 30). Psychoeducation treatments were conducted in groups of 10, with 8 weekly one-hour sessions between March 2019 and November 2020. Observer-rated ADHD symptom severity (IDA-R interview) was examined as the primary outcome parameter before and after treatment. Across both interventions, ADHD core symptoms were significantly reduced. Notably, the smartphone-assisted psychoeducation was significantly more effective in improving inattention and impulsivity and led to higher homework compliance than the brochure-assisted psychoeducation. No adverse events were reported.

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  • Profilbereich

    • Informatik und Gestaltung

  • Forschungsfeld

    • Human-Computer-Interaction

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2022
  • Journal Article
  • • Benjamin Selaskowski
  • • Adult ADHD

• Tax Misperception and its Effects on Decision Making – Literature Review and Behavioral Taxpayer Response Model

  Blaufus, K. ., Chirvi, M. ., Huber, H.-P. ., Maiterth, R. ., & Sureth-Sloane, C. . (2022). Tax Misperception and its Effects on Decision Making – Literature Review and Behavioral Taxpayer Response Model. European Accounting Review, 31(1). http://doi.org/10.1080/09638180.2020.1852095

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  Previous accounting research shows that taxes affect decision making by individuals and firms. Most studies assume that agents have an accurate perception regarding their tax burden. However, there is a growing body of literature analyzing whether taxes are indeed perceived correctly. We review 128 studies on the measurement of tax misperception and its behavioral implications. The review reveals that many taxpayers have substantial tax misperceptions that lead to biased decision making. We develop a Behavioral Taxpayer Response Model on the impact of provided tax information on tax perception. Besides individual traits, characteristics of the tax information and the decision environment determine the extent of tax misperception. We discuss opportunities for future research and methodological limitations. While there is much evidence on tax misperception at the individual level, we hardly find any research at the firm level. Little is known about the real effects of managers’ tax misperception and on how tax information is strategically managed to impact stakeholders. This research gap is surprising as a large part of the accounting literature analyzes decision making and disclosure of firms. We recommend a mixed-method approach combining experiments, surveys, and archival data analyses to improve the knowledge on tax misperception and its consequences.

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    • Chirvi, Malte

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2022
  • Journal Article
  • • Kay Blaufus
    • Malte Chirvi
    • Hans-Peter Huber
    • Ralf Maiterth
    • Caren Sureth-Sloane

• Solarthermisch gestützte Nah- und Fernwärmeversorgung als Baustein der sektorgekoppelten Wärmewende in Schleswig-Holstein (SolWW-SH).

  Freißmann, J. ., Fritz, M. ., & Tuschy, I. . (2022). Solarthermisch gestützte Nah- und Fernwärmeversorgung als Baustein der sektorgekoppelten Wärmewende in Schleswig-Holstein (SolWW-SH). Forschungsergebnisse. Abgerufen von http://www.znes-flensburg.de/sites/default/files/projects/SolWW-SH_ZNES_Forschungsergebnisse_2020531.pdf

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  • Personenseiten

    • Freißmann, Jonas
    • Fritz, Malte
    • Tuschy, Ilja

  • Profilbereich

    • Erneuerbare Energien und nachhaltige Entwicklung

  • Forschungsfeld

    • Wärme
    • Netzintegration

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2022
  • Journal Article
  • • Jonas Freißmann
    • Malte Fritz
    • Ilja Tuschy

• LSP Teacher Training Summer School . The TRAILs project

  Chateaureynaud, M.-A. ., & John, P. . (Hrsg.). (2022). LSP Teacher Training Summer School . The TRAILs project. Champs Didactiques Plurilingues : données pour des politiques stratégiques (Bd. 13, S. 280). Brüssel (Belgien): Peter Lang. http://doi.org/10.3726/b20096

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  This book is the result of research carried out in partnership with seven European universities as part of an Erasmus+ project on training teachers of Language for Specifi c Purpose (LSP) in higher education. All university partners, i.e. Bordeaux (France), Zagreb (Croatia), Jade (Germany), Cádiz (Spain), Adam Mickiewicz (Poland), Ljubljana (Slovenia), Arcola Research (UK), and Bergamo (Italy) carried out surveys and developed a detailed report showing that in Europe there is very little training for this type of teaching, and that teachers generally need to be trained in the specifi cities of the language fi eld they are going to teach. Medical or maritime English, legal Spanish, French for tourism, etc. require both an expert domain knowledge and a grounding in language teaching. Several testimonies highlight this situation and show the lack of career development prospects for LSP teachers at European universities. The members of the Erasmus+ TRAILs project have therefore been interested in the specifi c needs of LSP teachers and have been able to update the information through several types of surveys. The competences of LSP teachers were thus identifi ed. Based on this precise inventory, they are proposing to draw up a complete training programme. A pedagogical approach has been developed: resources, lesson preparation, course design, innovative pedagogical approaches are presented. The research presented in this book goes well beyond the TRAILs project and questions the training of specialised language teachers. More generally, it highlights the need to provide effective training and professional development for LSP teachers and offers a contribution to overcoming the shortcomings of LSP teacher education.

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  • Abteilung/Einrichtung

    • CIVU – Center for Interaction, Visualization and Usability

  • Profilbereich

    • Informatik und Gestaltung

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2022
  • Book
  • • Marie-Anne Chateaureynaud
    • Peter John

• Service Learning as an Approach to Teaching Small Business Management

  Behrends, T. ., & Binder, L. . (2022). Service Learning as an Approach to Teaching Small Business Management. In International Case Studies in Service Learning (Bd. 47, S. 99–115). Emerald Publishing Limited. http://doi.org/10.1108/S2055-364120220000047007

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  Small- and medium-sized enterprises (SMEs) are a central backbone of (most) national economies. Research shows, that due to their smaller size, SMEs not only have comparatively less formalized, less complex, and less specialized organizational structures, but a somewhat different social character as well. It is in particular the interplay of these structural and cultural peculiarities of SMEs that is difficult to impart perceptibly in regular university courses on Small Business Management. From a managerial science perspective, the structural as well as social characteristics of small non-profit organizations are quite similar to the above-mentioned features of SMEs. Both types of organizations usually function in a less bureaucratic and more personal way, while also being a bit more chaotic sometimes. In addition, both are often facing the challenges of severe resource scarcity as well as a lack of management competencies. In view of these fundamental similarities between SMEs and small non-profit organizations, the practical seminar Service Learning Project was designed to provide management students at Europa-Universität Flensburg with the opportunity of experiencing typical small business work realities. Here, student teams support local non-profit organizations in meeting typical management challenges ranging from the conception and implementation of fundraising or image campaigns to internal consultancy projects. In this way, the seminar offers the possibility to deal with real-world practical management issues while concurrently strengthening students’ civic societal awareness, fostering empathy, and overcoming the oftentimes overly pronounced distance between science and life-world practice.

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    • Jackstädt-Zentrum Flensburg (JZF)

  • Profilbereich

    • Start-up- und KMU-Management

  • Forschungsfeld

    • Fachkräfte und Vernetzung

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2022
  • Book Chapter
  • • Thomas Behrends
    • Larissa Binder