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2022

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

Abstract

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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Informatik und Gestaltung

Forschungsfeld

Human-Computer-Interaction

Fachbereich

Fachbereich 3: Information und Kommunikation
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2022

Journal Article

Benjamin Selaskowski

Adult ADHD
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

Abstract

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)

2021

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 2024)
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Witte, Francesco

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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
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 2024)
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Schlipf, David
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2021

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Yiyin Chen

David Schlipf

Po Cheng
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 2024)
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Schlipf, David
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2021

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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

Abstract

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

Abstract

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

Abstract

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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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

Fachbereich

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)

Abstract

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

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Fachbereich 2: Energy and Life Science
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2021

Journal Article

Dirk Volta

Samanta Weber

physical optimum

PhO

reference process

energy efficiency

energy optimization

method comparison

energy

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