Publikationen

2021

• Parameterization of wind evolution using lidar

  Chen, Y., Schlipf, D., & Cheng, P. W. (2021). Parameterization of wind evolution using lidar. Wind Energy Science, 6, 61–91. http://doi.org/10.5194/wes-6-61-2021 (Original work published 2026)

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    • Schlipf, David

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  • 2021
  • Journal Article
  • • Yiyin Chen
    • David Schlipf
    • Po Cheng

• Long-term thermal imbalance in large borehole heat exchangers array - A numerical study based on the Leicester project

  Chen, S., Cai, W., Witte, F., Wang, X., Wang, F., Kolditz, O., & Shao, H. (2021). Long-term thermal imbalance in large borehole heat exchangers array - A numerical study based on the Leicester project. Energy and Buildings, 231, 110518. http://doi.org/10.1016/j.enbuild.2020.110518 (Original work published 2026)

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    • Witte, Francesco

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2021
  • Journal Article
  • • Shuang Chen
    • Wanlong Cai
    • Francesco Witte
    • Xuerui Wang
    • Fenghao Wang
    • Olaf Kolditz
    • Haibing Shao

• A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics

  Guo, F., & Schlipf, D. (2021). A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics. Energies, 14. http://doi.org/10.3390/en14092492 (Original work published 2026)

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    • Schlipf, David

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  • 2021
  • Journal Article
  • • Feng Guo
    • David Schlipf

• Teilwicklungsanlauf von Käfigläufermotoren mit kombinierter Stern-Dreieck-Wicklung

  Huth, G., & Löhlein, B. (2021). Teilwicklungsanlauf von Käfigläufermotoren mit kombinierter Stern-Dreieck-Wicklung. http://doi.org/10.1007/s00502-021-00900-6

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  Mit Rücksicht auf die Netzverhältnisse müssen Käfigläufermotoren mit einem geeigneten Anlaufverfahren an das Drehstromnetz geschaltet werden. Liegen, wie zum Beispiel bei Kompressoren, schwere Anlaufbedingungen vor, so kommt neben dem verstärkten Stern-Dreieck-Anlauf häufig der Teilwicklungsanlauf zum Einsatz. Wenn zur Steigerung der Energieeffizienz eine kombinierte Stern-Dreieck-Wicklung zum Einsatz kommt, bietet sich die Drehfeldwicklung zusätzlich auch für den Teilwicklungsanlauf an, wenn die kombinierte Wicklung als Parallelschaltung ausgeführt ist. Die Möglichkeiten hierzu werden unter Berücksichtigung des Oberfeldverhaltens analysiert und am Beispiel von zwei Käfigläufermotoren wird das Betriebsverhalten simulativ untersucht.

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  • 2021
  • Journal Article
  • • Gerhard Huth
    • Bernd Löhlein

• The impact of entrepreneurship on economic, social and environmental welfare and its determinants: a systematic review

  Neumann, T. (2021). The impact of entrepreneurship on economic, social and environmental welfare and its determinants: a systematic review, 71(3), 553–584,. http://doi.org/10.1007/s11301-020-00193-7

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  This paper presents a systematic review of (a) the impact of entrepreneurship on economic, social and environmental welfare and (b) the factors determining this impact. Research over the past 25 years shows that entrepreneurship is one cause of macroeconomic development, but that the relationship between entrepreneurship and welfare is very complex. The literature emphasizes that the generally positive impact of entrepreneurship depends on a variety of associated determinants which affect the degree of this impact. This paper seeks to contribute to the literature in three ways. First, it updates and extends existing literature reviews with the recently emerged research stream on developing countries, and incorporates studies analysing not only the impact of entrepreneurship on economic growth and welfare but also on social and environmental welfare. Second, it identifies and structures the current knowledge on the determinants of this impact. And third, it provides a roadmap for future research which targets the shortcomings of the existing empirical literature on this topic. The review of 102 publications reveals that the literature generally lacks research which (a) goes beyond the common measures of economic welfare, (b) examines the long-term impact of entrepreneurship and (c) focuses on emerging and developing countries. Regarding the determinants of the impact of entrepreneurship, the results highlight the need for empirical research which addresses both already investigated determinants which require more attention (e.g. survival, internationalisation, qualifications) and those which are currently only suspected of shaping the impact of entrepreneurship (e.g. firm performance, the entrepreneur’s socio-cultural background and motivations).

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  • 2021
  • Journal Article
  • • Thomas Neumann

• A Key Manipulation Attack on Some Recent Isogeny-Based Key Agreement Protocols

  Gönen, M. E., Tutdere, S., & Uzunkol, O. (2021). A Key Manipulation Attack on Some Recent Isogeny-Based Key Agreement Protocols. Bulletin of the Iranian Mathematical Society . http://doi.org/10.1007/s41980-021-00534-6

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  Recently, Daghigh et al. proposed some isogeny-based key agreement protocols in Bull. Iran. Math. Soc. 43 (2017), no. 4, 77-88. They claimed that their key exchange protocols based on supersingular isogenies provide the same security level as the Jao et al.’s protocol SIDH. This paper addresses first a vulnerability of these protocols to a key manipulation attack. Hence, unlike the security claims of Daghigh et al., these protocols unfortunately do not provide the same security when compared with SIDH. Second, we show in particular that the secret dual isogenies of the protocols can easily be retrieved by applying our key manipulation attack. We also discuss lastly the countermeasures to this attack.

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  • Personenseiten

    • Uzunkol, Osmanbey

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2021
  • Journal Article
  • • Mehmet Gönen
    • Seher Tutdere
    • Osmanbey Uzunkol

• Digital Competences of Prospective Engineers and Science Teachers: A Latent Profile and Correspondence Analysis

  Schulze-Heuling, L., Wild, S., & Vest, A. (2021). Digital Competences of Prospective Engineers and Science Teachers: A Latent Profile and Correspondence Analysis. International Journal of Education in Mathematics, Science and Technology (IJEMST), 9(4), 760-782. http://doi.org/https://doi.org/10.46328/ijemst.1831 (Original work published Oktober 2021)

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    • Vest, Anja

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    • Fachbereich 2: Energy and Life Science

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  • 2021
  • Journal Article
  • • Lydia Schulze-Heuling
    • Steffen Wild
    • Anja Vest

• The Physical Optimum as an Ideal Reference Value for Balancing Thermodynamic Processes Integrating the Exergetic Evaluation by the Example of Heat Supply

  Volta, D., & Weber, S. (2021). The Physical Optimum as an Ideal Reference Value for Balancing Thermodynamic Processes Integrating the Exergetic Evaluation by the Example of Heat Supply. MDPI Energies, 14(15), 15. http://doi.org/https:// doi.org/10.3390/en14154426 (Original work published Juli 2021)

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  This paper contains the basic definition and application of the physical optimum as a method for process evaluation and optimization. By means of the exemplary balance of a wood pellet-fired boiler, the conventional efficiency is compared to the PhO. Furthermore, this study demonstrates the possibility of applying the thermodynamic state variable exergy as a physical reference property of a system within the PhO method. To explain the approach, the heat generation in the wood pellet-fired boiler is compared to the supply from a heat pump, which itself is connected to a power plant. Furthermore, the process-independent PhO is explained in order to illustrate the limitations of feasible optimization. Additionally, possible research topics such as the inte-gration of dynamic behavior in the method are approached. As a conclusion, the differences be-tween the methods outline the advantage of the PhO in the optimization process.

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    • Volta, Dirk
    • Rohm, Samanta Alena

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • Journal Article
  • • Dirk Volta
    • Samanta Weber
  • • physical optimum
    • PhO
    • reference process
    • energy efficiency
    • energy optimization
    • method comparison
    • energy

• Application of a New Dispatch Methodology to Identify the Influence of Inertia Supplying Wind Turbines on Day-Ahead Market Sales Volumes

  Thiesen, H., & Jauch, C. (2021). Application of a New Dispatch Methodology to Identify the Influence of Inertia Supplying Wind Turbines on Day-Ahead Market Sales Volumes. Energies, 14(5). http://doi.org/10.3390/en14051255 (Original work published Februar 2021)

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  Power system inertia is an essential part of grid frequency control. The number of synchronously connected machines, which inherently provide inertia, is decreasing due to the transition to renewable energies. Conventional generation units are being replaced by renewable generation units which are connected to the grid via frequency converters. Some power systems already suffer from too little power system inertia. Hence, inertia is a valuable yet non-traded commodity. A day-ahead dispatch methodology to secure power system inertia was developed and is applied and assessed in this work. Day-ahead market data of the combined market of the Republic of Ireland and Northern Ireland is used. If the superimposition of sell and buy bids results in insufficient inertia, the dispatch algorithm is applied. In decreasing price order, non-inertia-providing sell bids get replaced by the following sell bids in the merit order. The iterative process is repeated until sufficient inertia is in the system. The provision of synthetic inertia by wind turbines is considered in the process. The costs for additional stored kinetic energy for the assessed time periods and scenarios result in costs ranging from 1.02 to 4.49 EUR/kgm2.

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    • Thiesen, Henning
    • Jauch, Clemens

  • Abteilung/Einrichtung

    • Wind Energy Technology Institute

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  • 2021
  • Journal Article
  • • Henning Thiesen
    • Prof. Dr. Clemens Jauch

• Does it pay for new firms to be green? An empirical analysis of when and how different greening strategies affect the performance of new firms

  Neumann, T. (2021). Does it pay for new firms to be green? An empirical analysis of when and how different greening strategies affect the performance of new firms. Journal of Cleaner Production, 317, 128403. http://doi.org/https://doi.org/10.1016/j.jclepro.2021.128403

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  Despite the significant attention devoted to the impact of corporate greening strategies on firm performance, research has so far focused on established firms, leaving the situation in new firms unclear. In this study, it is hypothesised that the impact of greening strategies on the performance of new firms depends on the type of strategy, and that the firm s age positively moderates this impact. Using a cross-sectoral dataset of 11,039 new firms from 36 countries, binary and ordinal logistic regressions were estimated for different start-up phases. The results indicate that new firms benefit from substantive greening strategies but, contrary to expectations, not from symbolic greening strategies. The performance of new firms in their later start-up phases was even found to be harmed if they adopt symbolic strategies but do not reinforce them with substantive actions (green-washing). No impact, or only a weakly positive impact was found for firms adopting both substantive and symbolic greening strategies (green-highlighting) or only substantive ones (brown-washing). Furthermore, the interaction analyses did not reveal any moderating effects of firm age, but additional investigation shows that the impacts of greening strategies do differ between age groups. Finally, robustness tests reveal that the relationship between substantive greening strategies and the performance of new firms is not linear but decreases with increasing environmental efforts.

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  • Forschungsprojekt

    • StartUP SH

  • Abteilung/Einrichtung

    • Jackstädt-Zentrum Flensburg (JZF)

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2021
  • Journal Article
  • • Thomas Neumann
  • • Entrepreneurship
    • Start-up
    • Substantive vs symbolic greening
    • Greenwashing
    • Brownwashing
    • Age