Gloe, A. ., Jauch, C. ., & Räther, T. . (2021). Grid Support with Wind Turbines: The Case of the 2019 Blackout in Flensburg. Energies, 14(6), 1697. http://doi.org/10.3390/en14061697
Abstract
The work presented in this paper aims to show how modern wind turbines can help to control the frequency in a small grid which suffers from large power imbalances. It is shown for an exemplary situation, which occurred in Flensburg’s distribution grid in 2019: a major blackout, which occurred after almost two hours in islanding operation, affecting almost the entire distribution grid, which supplies approximately 55,000 households and businesses. For the analysis, a wind turbine model and a grid support controller developed at the Wind Energy Technology Institute are combined with real measurements from the day of the blackout to generate a fictional yet realistic case study for such an islanding situation. For this case study, it is assumed that wind turbines with grid support functionalities are connected to the medium voltage distribution grid of the city. It is shown to what extent wind turbines can help to operate the grid by providing grid frequency support in two ways: By supplying synthetic inertia only, where the wind turbines can help to limit the rate of change of frequency in the islanded grid directly after losing the connection to the central European grid. In combination with the primary frequency control capabilities of the wind turbines (WTs), the disconnection of one gen set in the local power station might have been avoided. Furthermore, wind turbines with primary frequency control capabilities could have restored the grid frequency to 50 Hz shortly after the islanding situation even if the aforementioned gen-set was lost. This would have allowed connecting a backup medium voltage line to the central European grid and thereby avoiding the blackout.
Zhang, J. ., Zeng, R. ., & Labes, A. . (2021). Marine microbial-derived molecules and their potential medical and cosmetic applications ). Frontiers in Microbiology, 12, 1965. http://doi.org/10.3389/FMICB.2021.706152
Irshad, M. ., Britto, R. ., & Petersen, K. . (2021). Adapting Behavior Driven Development (BDD) for large-scale software systems. Journal of Systems and Software, 177, 110944.
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
Abstract
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.
Küchler, R. ., & Herzig, C. . (2021). Connectivity is key: holistic sustainability assessment and reporting from the perspective of food manufacturers. British Food Journal. http://doi.org/10.1108/BFJ-03-2021-0317
Abstract
As members of the food supply chain, food manufacturers acquire power and hold responsibility for the sustainable transformation of our food systems. Sustainability assessment and reporting frameworks function as instruments to shape sustainable transformation processes. Their suitability for food manufacturing companies and their connectivity with the up- and downstream food supply chain is investigated here.
The first section of the study explores the need for holistic, company-based sustainability frameworks in the food manufacturing sector from the literature. The second part compares seven frameworks, in terms of content and supply chain connectivity.
Food sector specificity demands the inclusion of topics specific to food systems. Furthermore, none of the investigated frameworks fulfils both food sector specificity and full connectivity with the up- and downstream supply chain.
As a limitation to this work, comparison of the frameworks at topic-level instead of indicator-level is considered. The findings call for more harmonised and integrated sustainability assessment throughout the food supply chain.
The framework a food manufacturer should apply depends on their motivation behind conducting the sustainability assessment and reporting. Evidence is provided from various perspectives and with regard to key issues such as content, certification and communication.
No comparison between sustainability frameworks has been made yet from the supply chain perspective of food manufacturers.
Oelze, N. ., Simasiku, B. M., & Jackie, L. L. (2021). Namibian State of Logistics 2020 Report. Windhoek: Namibian-German Centre for Logistics. Abgerufen von https://www.giz.de/en/downloads/NGCL_Namibia-State-of-Logistics_Report2020-1.pdf
Abstract
This document has been prepared to summarise the findings of a study carried out by the Namibian-German Centre for Logistics into the current state of logistics in Namibia during the period from 2018 to 2020 and the impact of the Covid-19 pandemic on the industry. It updates studies carried into Namibian logistics in 2012 and 2018. The study has been undertaken by the research team on an wholly independent basis making use of contemporary data available in the public domain and surveys conducted by the team. It reflects the opinions of the authors based of review and analysis of the available evidence.
Bertel, S. ., Beck, L. ., Clausen, B. ., & Räker, T. . (2021). Kompetenzen für eine digitale Welt. Wie viel Wissenschaft braucht die Lehrerfortbildung? Arbeitsbündnisse im analogen und virtuellen Raum. Universität Regensburg.
Petersen, K. ., & Bin Ali, N. . (2021). An analysis of top author citations in software engineering and a comparison with other fields. Scientometrics, 126, 9147–9183.
Wohlin, C. ., Papatheocharous, E. ., Carlson, J. ., Petersen, K. ., egroth, E. A., Axelsson, J. ., … others, . . (2021). Towards evidence-based decision-making for identification and usage of assets in composite software: A research roadmap. Journal of Software: Evolution and Process, 33, e2345.