Hybrid Energy Storage System (HESS) have the potential to offer better flexibility to a grid than any single energy storage solution. However, sizing a HESS is challenging, as the required capacity, power and ramp rates for a given application are difficult to derive. This paper proposes a method for splitting a given load profile into several storage technology independent sub-profiles, such that each of the sub-profiles leads to its own requirements. This method can be used to gain preliminary insight into HESS requirements before a choice is made for specific storage technologies. To test the method, a household case is investigated using the derived methodology, and storage requirements are found, which can then be used to derive concrete storage technologies for the HESS of the household. Adding a HESS to the household case reduces the maximum import power from the connected grid by approximately 7000 W and the maximum exported power to the connected grid by approximately 1000 W. It is concluded that the method is particularly suitable for data sets with a high granularity and many data points.
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In deze thematische overzichtsstudie presenteren we de resultaten van een brede analyse van het beschikbare onderzoek rond het welzijn van docenten in het hoger onderwijs gedurende en na de coronapandemie. Docentenwelzijn is hierbij, in lijn met de conceptualisatie van Viac & Fraser (2020), onderverdeeld in vier dimensies: cognitief, subjectief, fysiek en mentaal, en sociaal welzijn. De centrale onderzoeksvraag was: Wat is er bekend over de veranderingen op de vier dimensies van het welzijn van docenten in het hoger onderwijs als gevolg van online en hybride werken en lesgeven gedurende de coronapandemie?Met behulp van een scoping literatuurstudie aan de hand van vier selectiecriteria1 vonden we 48 relevante artikelen; 37 artikelen verschenen in wetenschappelijke tijdschriften en 11 publicaties maakten deel uit van ‘grijze’ literatuur. Uit deze publicaties blijkt dat de verandering naar online of hybride werken een aanzienlijke impact had op het welzijn van docenten in het hoger onderwijs. Hierbij kunnen vier grotere thema’s onderscheiden worden: de impact van thuiswerken op productiviteit, op de verbinding en het contact met collega’s en studenten, de ervaren werkdruk en een veranderende werk-privé balans. Hoewel de negatieve impact van de nieuwe manier van werken op het docentenwelzijn overheerst, werden in meerdere studies ook positieve effecten op docentenwelzijn gerapporteerd. Hiermee lijkt het thuis en op afstand werken een ‘double edged sword’ voor docentenwelzijn te zijn geweest tijdens de coronapandemie. Op basis van deze uitkomsten worden een aantal aandachtspunten voor het Nederlands hoger onderwijs en aanbevelingen voor vervolgonderzoek gegeven.
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Distribution structures, as studied in this paper, involve the spatial layout of the freight transport and storage system used to move goods between production and consumption locations. Decisions on this layout are important to companies as they allow them to balance customer service levels and logistics costs. Until now there has been very little descriptive research into the factors that drive decisions about these structures. Moreover, the literature on the topic is scattered across various research streams. In this paper we review and consolidate this literature, with the aim to arrive at a comprehensive list of factors. Three relevant research streams were identified: Supply Chain Management (SCM), Transportation and Geography. The SCM and Transportation literature mostly focus on distribution structure including distribution centre (DC) location selection from a viewpoint of service level and logistics costs factors. The Geography literature focuses on spatial DC location decisions and resulting patterns mostly explained by location factors such as labour and land availability. Our review indicates that the main factors that drive decision-making are “demand level”, “service level”, “product characteristics”, “logistics costs”, “labour and land”, “accessibility” and “contextual factors”. The main trade-off influencing distribution structure selection is “service level” versus “logistics costs”. Together, the research streams provide a rich picture of the factors that drive distribution structure including DC location selection. We conclude with a framework that shows the relative position of these factors. Future work can focus on completing the framework by detailing out the sub factors and empirically testing the direction and strength of relationships. Cooperation between the three research streams will be useful to further extend and operationalize the framework.
Every year the police are confronted with an ever increasing number of complex cases involving missing persons. About 100 people are reported missing every year in the Netherlands, of which, an unknown number become victims of crime, and presumed buried in clandestine graves. Similarly, according to NWVA, several dead animals are also often buried illegally in clandestine graves in farm lands, which may result in the spread of diseases that have significant consequences to other animals and humans in general. Forensic investigators from both the national police (NP) and NWVA are often confronted with a dilemma: speed versus carefulness and precision. However, the current forensic investigation process of identifying and localizing clandestine graves are often labor intensive, time consuming and employ classical techniques, such as walking sticks and dogs (Police), which are not effective. Therefore, there is an urgent request from the forensic investigators to develop a new method to detect and localize clandestine graves quickly, efficiently and effectively. In this project, together with practitioners, knowledge institutes, SMEs and Field labs, practical research will be carried out to devise a new forensic investigation process to identify clandestine graves using an autonomous Crime Scene Investigative (CSI) drone. The new work process will exploit the newly adopted EU-wide drone regulation that relaxes a number of previously imposed flight restrictions. Moreover, it will effectively optimize the available drone and perception technologies in order to achieve the desired functionality, performance and operational safety in detecting/localizing clandestine graves autonomously. The proposed method will be demonstrated and validated in practical operational environments. This project will also make a demonstrable contribution to the renewal of higher professional education. The police and NVWA will be equipped with operating procedures, legislative knowledge, skills and technological expertise needed to effectively and efficiently performed their forensic investigations.
