Sell R.,Tallinn University of Technology |
Seiler S.,Bochum University of Applied Sciences
International Journal of Engineering Education | Year: 2012
In the current paper the design-centric approach for mechatronics and smart product design is presented. The novel aspect of the proposed solution is a comprehensive learning concept and environment which includes remote labs, mobile hardware, methodology, learning material and web environments. The whole concept supports fast and student-oriented learning process for acquiring knowledge and practical skills of integrated systems. The concept is applied into practice in the course of several stages. The most recent case study is described in this paper and the course setup proposed. The feedback from students indicates the time spent by the student on the activity, when the course follows the proposed concept. It is apparent that students spend considerably more time than the curriculum requires. At the same time, workload of the supervisor is lower. However, the quality and learning outcomes are higher than those of previous related courses, but without using novel technologies. In the current paper special attention is paid to remote and virtual labs related to the proposed learning concept. © 2012 TEMPUS Publications.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: LCE-02-2015 | Award Amount: 6.14M | Year: 2016
Within the project SURE (Novel Productivity Enhancement Concept for a Sustainable Utilization of a Geothermal Resource) the radial water jet drilling (RJD) technology will be investigated and tested as a method to increase inflow into insufficiently producing geothermal wells. Radial water jet drilling uses the power of a focused jet of fluids, applied to a rock through a coil inserted in an existing well. This technology is likely to provide much better control of the enhanced flow paths around a geothermal well and does not involve the amount of fluid as conventional hydraulic fracturing, reducing the risk of induced seismicity considerably. RJD shall be applied to access and connect high permeable zones within geothermal reservoirs to the main well with a higher degree of control compared to conventional stimulation technologies. A characterization of the parameters controlling the jet-ability of different rock formations, however, has not been performed for the equipment applied so far. SURE will investigate the technology for deep geothermal reservoir rocks at different geological settings such as deep sedimentary basins or magmatic regions at the micro-, meso- and macro-scale. Laboratory tests will include the determination of parameters such as elastic constants, permeability and cohesion of the rocks as well as jetting experiments into large samples in. Samples will be investigated in 3D with micro CT scanners and with standard microscopy approaches. In addition, advanced modelling will help understand the actual mechanism leading to the rock destruction at the tip of the water jet. Last but not least, experimental and modelling results will be validated by controlled experiments in a quarry (mesoscale) which allows precise monitoring of the process, and in two different geothermal wells. The consortium includes the only company in Europe offering the radial drilling service.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: LCE-23-2016 | Award Amount: 10.00M | Year: 2016
The GEMex project is a complementary effort of a European consortium with a corresponding consortium from Mexico, who submitted an equivalent proposal for cooperation. The joint effort is based on three pillars: 1 Resource assessment at two unconventional geothermal sites, for EGS development at Acoculco and for a super-hot resource near Los Humeros. This part will focus on understanding the tectonic evolution, the fracture distribution and hydrogeology of the respective region, and on predicting in-situ stresses and temperatures at depth. 2 Reservoir characterization using techniques and approaches developed at conventional geothermal sites, including novel geophysical and geological methods to be tested and refined for their application at the two project sites: passive seismic data will be used to apply ambient noise correlation methods, and to study anisotropy by coupling surface and volume waves; newly collected electromagnetic data will be used for joint inversion with the seismic data. For the interpretation of these data, high-pressure/ high-temperature laboratory experiments will be performed to derive the parameters determined on rock samples from Mexico or equivalent materials. 3 Concepts for Site Development: all existing and newly collected information will be applied to define drill paths, to recommend a design for well completion including suitable material selection, and to investigate optimum stimulation and operation procedures for safe and economic exploitation with control of undesired side effects. These steps will include appropriate measures and recommendations for public acceptance and outreach as well as for the monitoring and control of environmental impact. The consortium was formed from the EERA joint programme of geothermal energy in regular and long-time communication with the partners from Mexico. That way a close interaction of the two consortia is guaranteed and will continue beyond the duration of the project.
Baitsch M.,Bochum University of Applied Sciences |
Le K.C.,Ruhr University Bochum |
Tran T.M.,Ruhr University Bochum
International Journal of Engineering Science | Year: 2015
Abstract Within the recently proposed continuum dislocation theory, numerical simulations of the displacement controlled wedge indentation for single crystals using the finite elements are provided. Under the assumption of plane strain deformation of the crystal having only one active slip system on each side of the wedge the load-displacement curve as well as the dislocation density are computed for the loading and unloading path in terms of the indentation depth. The results of numerical simulations are compared with those obtained from the experiments which shows qualitative agreement. © 2015 Elsevier Ltd.
Wahl T.,University of South Florida |
Wahl T.,University of Siegen |
Mudersbach C.,Bochum University of Applied Sciences |
Jensen J.,Bochum University of Applied Sciences
Coastal Engineering Journal | Year: 2015
This paper summarizes the results from calculating exceedance probabilities of different storm surge scenarios developed within the XtremRisK project, which were then used as boundary conditions for integrated risk analyses for the city of Hamburg in the Elbe Estuary and Sylt Island off the coastline of Schleswig-Holstein in northern Germany. A stochastic storm surge model is developed to simulate a large number of synthetic and physically consistent storm surge scenarios, before the resulting samples are used to calculate bivariate joint exceedance probabilities of the storm surge heights (total water levels with tides included) and intensities. The Copula theory is exploited and functions from the Archimedean family are used to build the statistical models. The latter are extended to the three-dimensional case to also take into account wave conditions where appropriate. The uncertainties associated with the results from the multivariate extreme value analyses are briefly discussed and (where possible) quantified and recommendations of how to exploit the presented methodologies in future applications are given. © 2015 World Scientific Publishing Company and Japan Society of Civil Engineers.
Vogt C.,Bochum University of Applied Sciences
Environmental and Resource Economics | Year: 2016
In this paper, we study the formation of international climate coalitions in the case players are perfectly heterogeneous and inequality averse. The paper provides an analytical solution for the optimal contribution of an arbitrary coalition member to a linear and pure public good. Based on empirical estimates for the parameters the model is then applied to the problem of climate mitigation policies. We provide a full stability analysis of all coalitions that can be formed by the twelve world regions from Nordhaus’ RICE model. As it turns out, only four two-player coalitions are internally stable. For a wealthy country leaving a coalition, its absolute payoff increases more than its disutility from additional advantageous inequality. A poor country improves its welfare by dropping out since its absolute payoff increases and, at the same time, disutility from disadvantageous inequality is reduced. Introducing suitable transfer schemes, however, large coalitions consisting of economically divergent countries turn out to be internally stable. © 2016 Springer Science+Business Media Dordrecht
Selbmann K.,Bochum University of Applied Sciences
Environmental Values | Year: 2015
Within the EU, Germany took a pioneering role in the production and promotion of biofuels. To explain this role the article analytically examines public discourses on biofuels. The analysis points out how the subject is interpreted and positioned by relevant actors and thus results in a specific public perception of biofuels in Germany. This perception in turn influences political decision-making processes. Since the analysis of discourses contributes to a better understanding of today’s biofuel policy in Germany, the article characterises the biofuel discourse during the genesis of this policy. Additionally, it analytically traces changes of discourse constellations in the course of the biofuel policy path. © 2015 The White Horse Press.
Kretschmann J.,Bochum University of Applied Sciences
International Journal of Mining Science and Technology | Year: 2013
The concept of sustainable land management (SLM) can help create a balance between the different demands of economy, society and nature. SLM means to actively develop land based on a knowledge-based procedure. It should aim on long term enhancements. The basis of SLM is the interests and the goals of the stakeholders. It is the result of a bargaining process between different institutions by creating win-win-situations or adequate conflict solutions to reach a consensus. The Ruhr Area is Germany's biggest metropolitan area. Land management regarding economic, social and environmental issues, which has a long tradition in this area, goes back to 1920. Being the centre of the heavy industry in Germany for more than 150 years, the Ruhr Area today is a green metropolis. The ecological, social and economical change of this industrial region can serve as a role model for SLM in urban areas all over the world. © 2013 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
Prilla M.,Bochum University of Applied Sciences |
Nolte A.,Bochum University of Applied Sciences
Lecture Notes in Business Information Processing | Year: 2012
Despite its increasing success in organizations, traditional BPM embodies a top-down approach performed by a small group of experts, limiting process stakeholders to part-time information providers, hindering proactive contributions. In this paper, we argue that BPM can benefit from being complemented with a bottom-up and people-centric strategy, allowing for interventions by process stakeholders. However, this cannot be realized by turning ordinary users into BPM or modeling experts. Instead, there is a need to find appropriate means to engage these people into BPM, process development and modeling. In this paper, we present two explorative empirical studies exploring such means. As a result of analyzing these studies, we present five proposals towards the implementation of stakeholder involvement. Our work does not want to replace existing BPM procedures, but to complement them. Thus, it is a starting point for further research and as an opportunity to join forces with other researchers pursuing similar goals. © 2012 Springer-Verlag Berlin Heidelberg.
Klingspor V.,Bochum University of Applied Sciences
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016
In recent years, various socio-political debates and scandals have raised old and new questions regarding data protection that, among other things, will also lead to new European legislation initiatives. However relevant each issue may be, there is far too little discussion in the public which potentials, be it positive or negative, exist with the possibility of combining data from different sources. In this article I want to give a non-exhaustive overview of the manner in which such information about everyone of us is collected today, before I discuss the social risks this may entail. I close the article with some theses outlining a path that helps to protect the rights of freedom of the citizens despite the extensive collection and analysis of data (My heartfelt thanks goes to Edward Sodmann for proofreading this text. He required tons of hours to generate something from my text, that can be understood at all.). © Springer International Publishing Switzerland 2016.