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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Schwede, Sebastian (Dipl.);

    Ziel der vorliegenden Dissertation war die Untersuchung und Optimierung des Biogasbildungspotentials der marinen Mikroalge \(\textit {Nannochloropsis salina}\) im Rahmen von Batchversuchen und einer semi-kontinuierlichen Langzeitstudie im Vergleich zu Maissilage. Im Rahmen der Batchersuche wurden der Salzgehalt, der robuste Zellwandaufbau und die unausgeglichene Nähstoffzusammensetzung der Algenbiomasse als limitierende Faktoren in der Vergärung der Mikroalge identifiziert. In semi-kontinuierlichen Langzeitversuchen wurde in der Monovergärung der Algenbiomasse eine konstante Zunahme des Ammoniumgehaltes und der Leitfähigkeit beobachtet, die in einer Störung des Prozessgleichgewichtes durch Akkumulierung von flüchtigen organischen Säuren resultierte. Durch Adaption der mikrobiellen Biozönose an die veränderten Bedingungen konnte zum Ende der Versuchsreihe ein stabiler Abbau der Algenbiomasse mit vermindertem Abbaugrad (ca. 50%) erreicht werden.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Dokumentenrepositori...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Dokumentenrepositori...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Ladineo, Marcus;

    The report 'Our Common Future' (1987) defines Sustainable Development as 'development that meets the needs of the present without compromising the ability of future generations to meet their own needs' (WCED). But regarding diverging backgrounds of value orientations, interests, ego involvements, and the inherent fuzziness of the notion of Sustainable Development it is to be expected that stakeholders have their own ideas of Sustainability or at least weight the aspects of sustainability differently. This empirical study provides a social psychological model of this 'subjective theories' about Sustainable Development. One important conceptual distinction had been implemented in the design of the study: Sustainability as an abstract concept, more reflecting a general world view on the one hand side, and Sustainability as a more concrete evaluation of a given situation (i. e. new technology or policy) in an environmental context on the other. 99 members of environmental groups, natur conversation groups, and members of wind energy associations were asked with a self rating questionnaire about their attitudes towards sustainability, value orientations and general political beliefs. As an example for the concrete aspect of Sustainability subjects were asked to what extent they regard the technology of offshore wind energy as sustainable (i.e. concerning its potential harm for species) and about the perceived risks and chances accompanied with this new form of energy supply. Three most important results can be stated: 1. Five dimensions of general Sustainability were identified using exploratory and confirmatory factor analysis: belief in technological progress, democratic paticipation, ecocentrism, individual lifestyle/consumption, and attitudes towards the western, growth oriented economic system. 2. Measured by correlational and path analytical methods almost no evidence was found for any relation between the abstract view of Sustainability and the perceived sustainability of offshore wind energy. The abstract 'theory' about Sustainability could be explained by the abstract value orientation of the subjects whilst the estimated Sustainability of this form of environmental technology was related to its perceived risks and chances.3. Analysis of variance yielded that also the group memership had an impact for the estimated Sustainability of offshore wind energy, its risks and chances. As hypothesized subjects belonging to wind energy associations estimated the risks for species lowest and the chances for a positive effect for CO2 reduction (and therefore for the protection of the climate) highest. The nature conservation groups estimated risks and chances conversely. The judgement of the environmental conversation groups was found between those poles. However almost no difference could be found in the abstract notion of Sustainable Development, general value orientation, and political beliefs between the subgroups of the sample. The empirical findings of the study were summarized by proposing a social psychological model of subjective perception of Sustainability. The theoretical impact of the results and the limitations of the study were discussed at the end.

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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ E-LIB Dokumentserver...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Mittal, Radhika; Brüggemann, Michael;

    Working Paper Series "Sustainable Lives - Food Choices" Project website This Working Paper was presented at the 69th Annual International Communication Association (ICA) Conference 2019 in Washington, D.C.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://dx.doi.org/1...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    https://dx.doi.org/10.25592/uh...
    Research . 2019
    License: CC BY
    Data sources: Datacite
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    https://dx.doi.org/10.25592/uh...
    Research . 2019
    License: CC BY
    Data sources: Datacite
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    B2FIND
    Research . 2019
    Data sources: B2FIND
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://dx.doi.org/1...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      https://dx.doi.org/10.25592/uh...
      Research . 2019
      License: CC BY
      Data sources: Datacite
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      https://dx.doi.org/10.25592/uh...
      Research . 2019
      License: CC BY
      Data sources: Datacite
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      B2FIND
      Research . 2019
      Data sources: B2FIND
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Mette, Barbara;

    Im Rahmen der Dissertation wurden ein Reaktordesign und eine Reaktionsführung für einen in einer offenen Prozessführung betriebenen thermochemischen Energiespeicher erarbeitet. Als Speichermaterial wurde ein binderfreier Zeolith 13X (Firma Chemiewerke Bad Köstritz) sowie neue, am ITW hergestellte Kompostmaterialien aus dem binderfreien Zeolith 13X und den Salzen Magnesiumsulfat und Calciumchlorid untersucht. Durch die Speicherung der Solarwärme in einem reversiblen Prozess (Sorption bzw. Hydratation) ist eine kompakte und nahezu verlustfreie Speicherung der Solarenergie aus den Sommermonaten bis in die Wintermonate hinein möglich. Damit kann die Effizienz der solaren Kombianlage gesteigert sowie der Anteil der solar bereitgestellten Wärme zur Gebäudebeheizung erhöht werden. Es wurden experimentelle Untersuchungen an den Speichermaterialien sowie numerische und experimentelle Untersuchungen zum Reaktordesign und zur Reaktionsführung durchgeführt. Die experimentellen Materialuntersuchungen am Einzelpartikel und im Haufwerk gaben Aufschluss über das Reaktionsgleichgewicht, über die Speicherdichte und über das makroskopische Reaktionsverhalten der Speichermaterialien. Gleichzeitig wurden durch die Materialuntersuchungen neue Erkenntnisse bezüglich des Einflusses des in den Zeolithen eingebrachten Salzes auf die Porenstruktur des Zeolithen sowie auf die Sorptionskapazität und auf das Reaktionsverhalten des Komposits gewonnen. Ein wesentliches Ergebnis war, dass die Sorptionskapazität des Komposits nur bei einem hohen Wasserdampfgehalt der Luft über der Sorptionskapazität des reinen Zeolithen lag. Bei geringeren Feuchten wurde eine deutlich verminderte Sorptionskapazität des Komposits beobachtet (Abnahme um 15 bis 30 %). Ein Grund hierfür war, dass durch das Einbringen des Salzes in den Zeolithen das Mikroporenvolumen und die Mikroporenoberfläche und damit die zur Verfügung stehende Adsorptionsoberfläche reduziert wurden. Dennoch wurde beim Komposit aus Zeolith und Magnesiumsulfat eine mit dem Zeolithen vergleichbare, ...

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  • Authors: Gehrmann, Hans-Joachim;

    Für die Optimierung eines bereits bestehenden Prozesses, z.B. im Hinblick auf den maximal möglichen Durchsatz bei gleich bleibender Qualität der Pyrolyseprodukte oder für die Einstellung der Betriebsparameter bei einem unbekannten Einsatzstoff, kann ein mathematisches Modell eine erste Abschätzung für die Einstellung betrieblicher Parameter, wie z.B. Temperaturprofile im Gas und Feststoff, geben. Darüber hinaus kann man mit einem Modell für neu zu konzipierende Anlagen konstruktive Parameter ermitteln oder überprüfen. In dem hier dargestellten vereinfachten Modellansatz werden u. a. die Umsatzvorgänge für ein Partikelkollektiv mit Hilfe von Summenparametern aus Untersuchungen an einer Thermowaage und ergänzend im Drehrohr ermittelt. Das Prozessmodell basiert auf einem Reaktormodell, das das Verweilzeitverhalten des Einsatzstoffes im Reaktor beschreibt und einem Basismodell, bestehend aus Massen- und Energiebilanzen für Solid und Gas sowie Ansätzen zur Trocknung und zum Umsatz. Im Hinblick auf die Verfügbarkeit von stoffspezifischen Daten von Abfällen sind insbesondere zur Berechnung des Verweilzeitverhaltens und des Umsatzes im Heißbetrieb vereinfachende Ansätze durch die Bildung von Summenparametern hilfreich. Das Prozessmodell wurde schrittweise validiert: Zunächst wurde in Kaltversuchen ein Summenparameter, der u.a. die unbekannten Reibungsverhältnisse im Drehrohr berücksichtigt, durch Vergleich von Experiment und Rechnung für Sand ermittelt. Für heterogene Abfallgemische kann dieser Materialfaktor zwar für Kaltversuche bestimmt werden (soweit dies für Abfälle möglich ist), im Heißbetrieb ändern sich jedoch alle wesentlichen Stoffparameter wie Partikeldurchmesser, Schüttdichte und Schüttwinkel sowie die Reibungsverhältnisse. Für diesen Fall wird der Materialfaktor zu Eins gesetzt und die wesentlichen Stoffgrößen umsatzabhängig modelliert. Dazu ist die Kenntnis der Schüttdichten, statischen Schüttwinkel und mittleren Partikeldurchmesser vom Abfall und Koks aus dem Abfall notwendig. Die mit diesen Stoffdaten ...

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Wolf, D.; Dötsch, C.;

    Compressed Air Energy Storage (CAES) is successfully applied since decades. The report shows basic functionality of the CAES plants Huntorf and McIntosh and compares them regarding technical parameters. Special attention is paid to the retrofit of the Huntorf plant. Furthermore alternative CAES process concepts are presented and explained. Finally the adequacy of different CAES process concepts on the basis of application scenarios is discussed and evaluated.

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    Authors: S. Walter; S. Ulli-Beer; A. Wokaun;
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    Authors: Fritz, Martin;

    Der Beitrag geht der Frage nach, welche Besonderheiten Genossenschaften zu beispielhaften Akteuren der Nachhaltigkeit und nachhaltigen Arbeit machen. Dazu wird ein Begriff der Nachhaltigkeit eingeführt, in dem die drei Dimensionen des Ökonomischen, Sozialen und Ökologischen wechselseitig aufeinander bezogen sind und auf die Tätigkeit der Arbeit angewandt werden. Anschließend werden die vorwiegend in lokalen Kontexten tätigen Genossenschaften als Unternehmens- und Rechtsform vorgestellt. Wichtige Leitideen wie Kooperation, Partizipation und Autonomie werden erläutert und als spezifisch genossenschaftliche Merkmale das Identitätsprinzip sowie der Förderzweck identifiziert. Entlang der drei Nachhaltigkeitsdimensionen verdeutlichen die im Folgenden diskutierten theoretischen Argumente und empirisches Datenmaterial, wie diese beiden Prinzipien zu nachhaltiger Arbeit führen. Dabei werden auch Parallelen gezogen zu den Kriterien einer erfolgreichen Bewirtschaftung von Gemeingütern (Commons) und schließlich auf die Notwendigkeit von repräsentativen Studien zu Genossenschaften verwiesen, um Wissen darüber zu erlangen, wie deren Nachhaltigkeitspotenziale auch in anderen Unternehmensformen und über lokale Zusammenhänge hinaus genutzt werden können. This paper investigates the values and principles of cooperatives and relates them to the triple bottom line of sustainability: economic, social and ecological. Sustainable work is conceptualized in a similar way understanding the three dimensions as interdependent aspects of using resources responsibly. Furthermore, the mainly locally operating cooperatives are discussed as a legal form of a company. Their guiding principles such as solidarity, democratic participation and autonomy are introduced and two distinguishing features recognized: the identity principle and the purpose of self-help. Following the three dimensions of sustainability, the article discusses theoretical arguments and presents empirical data showing how these two principles lead to a realization of sustainable work. The paper also draws parallels between cooperatives' principles and managing the 'commons'. It concludes calling for representative surveys on cooperatives in order to learn more about how to apply cooperatives' principles in other companies and beyond local realities. AIS-Studien

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Social Science Open ...arrow_drop_down
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    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    BiPrints
    Article . 2017
    License: "In Copyright" Rights Statement
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    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Publications at Bielefeld University
    Article . 2017
    License: "In Copyright" Rights Statement
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Publications at Bielefeld University
    Other literature type . 2017
    License: "In Copyright" Rights Statement
    https://dx.doi.org/10.21241/ss...
    Other literature type . 2017
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Social Science Open ...arrow_drop_down
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      BiPrints
      Article . 2017
      License: "In Copyright" Rights Statement
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Publications at Bielefeld University
      Article . 2017
      License: "In Copyright" Rights Statement
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Publications at Bielefeld University
      Other literature type . 2017
      License: "In Copyright" Rights Statement
      https://dx.doi.org/10.21241/ss...
      Other literature type . 2017
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Bastian, Daniel;

    This work contains investigations on the effect of powdered activated carbon (PAC) on the effluent quality and operational safety of a membrane bioreactor (MBR), as well as its effects on sewage sludge quality. The tests to detect these effects were carried out in one of the four large-scale MBRs operated in parallel at an 80.000 p.e. WWTP sewage treatment plant in Kaarst. Comparative investigations without PACs were carried out in two other MBRs. The focus was on different dosing strategies in which the PAC was dosed into the activated sludge tank in proportion to the volume flow, continuously over time and in daily pulse dosings. The cleaning performance of the PAC-MBR was improved compared to the reference. The elimination of carbon compounds and especially the adsorption of trace organic substances was significantly increased at the low PAC dosing rates of 7±5 to 10±7 gPAC/m³ influent. The mean and maximum values for nitrogen compounds in the effluent were also lower in the PAC-MBR than in the MBR without PAC, while no significant change was observed for phosphorus.At similar PAC doses, only a slight difference between the dosing strategies was discernible. Overall, the continuous dosing showed the best organic carbon and trace organic substances elimination. Daily pulse dosing showed the highest system availability for PAC dosing due to the simple dosing technology.A better filterability of the activated sludge with PAC addition could be determined and was linked to a lower content of fouling-promoting substances. In addition, a reduction in the air requirement for nitrification aeration of the PAC-MBR was observed.An improvement in the thickening of the excess sludge via sieve belt thickener was observed. The improved dewaterability of the digested sludge could be demonstrated in the laboratory in semi-technical and in the large-scale tests. During a time of PAC dosing in all four MBRs of the WWTP, a clear improvement for the dewatering efficiency in the large-scale centrifuge was achieved at the tested PAC concentrations. The cost of PAC dosing into the biological stage is not determined by the investment costs, but largely by the operating costs from PAC dosing. Considering possible savings for the wastewater levy, aeration energy and sludge disposal costs, the additional costs for PAC dosing are reduced by approx. 50 to 80 %, depending on the scenario. The investigations carried out show a high technological potential. Membrane bioreactor technology has already been state of the art for 20 years and it is complemented and completed to a considerable extent by the dosing of PAC. Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen , 2023; Aachen : RWTH Aachen University 1 Online-Ressource : Illustrationen, Diagramme (2023). = Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2023 Published by RWTH Aachen University, Aachen

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    https://dx.doi.org/10.18154/rw...
    Doctoral thesis . 2023
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Publikationsserver d...arrow_drop_down
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      https://dx.doi.org/10.18154/rw...
      Doctoral thesis . 2023
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Müller, Anna-Lisa;

    This paper argues that the sustainability paradigm is currently used to transform industrial port cities into creative sustainable cities (Müller, 2013). Based on empirical data from the city of Dublin, I show that the sustainability paradigm is combined with the creative city paradigm to revitalize inner-city quarters. This urban planning strategy includes a focus on the creative class (Florida, 2004) and aims at integrating the old in the new, both in architectural and social terms. With this, it tries to be an integrative urban revitalization strategy. In the course of the 20th century, the Irish society developed from an industrial to a postindustrial, knowledge-based society (Bell, 1973; Drucker, 1993). New occupations emerged, making new forms of working spaces and modes of transport necessary, and a growing population now asks for a new kind of living spaces. Additionally, inner-city quarters have become increasingly popular with people working in knowledge-intensive industries. Consequently, city planners have initiated a revitalization process in these quarters, and they used two urban planning paradigms â creative cities (Florida, 2005) and sustainability â as guidelines for urban regeneration. This strategy aims to transform the whole city, but the single districts have to be the object of investigation when empirically approaching the changes of the built environment. Here we see that a threefold understanding of sustainability is used to integrate the demands of the new social groups in those of existing communities. Thus, the approaches used in the districts differ: (1) In The Liberties, home of a new-build technology cluster, the focus is on an economically sustainable development. (2) In Temple Bar, Dublin's cultural quarter, the emphasis is on a socially sustainable approach. (3) In the Docklands, the area of the old inner-city harbor, an attempt is made to combine all three dimensions of sustainability by creating new buildings (ecological sustainability) for both 'old' and 'new'1 inhabitants (social sustainability) and work space for growing industries like the knowledge-intensive industries (economic sustainability). The urban revitalization strategies have one thing in common: The inner-city districts dispose of a number of protected buildings which have to be integrated in the re-structuring of the quarters. Therefore, these buildings are renovated and combined with new buildings to form an architectural and spatial image of Dublin as a city with a future that is rooted in the city's industrial past. In this sense, the urban regeneration approach even has a notion of architectural and historical sustainability. San Francisco

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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Schwede, Sebastian (Dipl.);

    Ziel der vorliegenden Dissertation war die Untersuchung und Optimierung des Biogasbildungspotentials der marinen Mikroalge \(\textit {Nannochloropsis salina}\) im Rahmen von Batchversuchen und einer semi-kontinuierlichen Langzeitstudie im Vergleich zu Maissilage. Im Rahmen der Batchersuche wurden der Salzgehalt, der robuste Zellwandaufbau und die unausgeglichene Nähstoffzusammensetzung der Algenbiomasse als limitierende Faktoren in der Vergärung der Mikroalge identifiziert. In semi-kontinuierlichen Langzeitversuchen wurde in der Monovergärung der Algenbiomasse eine konstante Zunahme des Ammoniumgehaltes und der Leitfähigkeit beobachtet, die in einer Störung des Prozessgleichgewichtes durch Akkumulierung von flüchtigen organischen Säuren resultierte. Durch Adaption der mikrobiellen Biozönose an die veränderten Bedingungen konnte zum Ende der Versuchsreihe ein stabiler Abbau der Algenbiomasse mit vermindertem Abbaugrad (ca. 50%) erreicht werden.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Dokumentenrepositori...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Dokumentenrepositori...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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    Authors: Ladineo, Marcus;

    The report 'Our Common Future' (1987) defines Sustainable Development as 'development that meets the needs of the present without compromising the ability of future generations to meet their own needs' (WCED). But regarding diverging backgrounds of value orientations, interests, ego involvements, and the inherent fuzziness of the notion of Sustainable Development it is to be expected that stakeholders have their own ideas of Sustainability or at least weight the aspects of sustainability differently. This empirical study provides a social psychological model of this 'subjective theories' about Sustainable Development. One important conceptual distinction had been implemented in the design of the study: Sustainability as an abstract concept, more reflecting a general world view on the one hand side, and Sustainability as a more concrete evaluation of a given situation (i. e. new technology or policy) in an environmental context on the other. 99 members of environmental groups, natur conversation groups, and members of wind energy associations were asked with a self rating questionnaire about their attitudes towards sustainability, value orientations and general political beliefs. As an example for the concrete aspect of Sustainability subjects were asked to what extent they regard the technology of offshore wind energy as sustainable (i.e. concerning its potential harm for species) and about the perceived risks and chances accompanied with this new form of energy supply. Three most important results can be stated: 1. Five dimensions of general Sustainability were identified using exploratory and confirmatory factor analysis: belief in technological progress, democratic paticipation, ecocentrism, individual lifestyle/consumption, and attitudes towards the western, growth oriented economic system. 2. Measured by correlational and path analytical methods almost no evidence was found for any relation between the abstract view of Sustainability and the perceived sustainability of offshore wind energy. The abstract 'theory' about Sustainability could be explained by the abstract value orientation of the subjects whilst the estimated Sustainability of this form of environmental technology was related to its perceived risks and chances.3. Analysis of variance yielded that also the group memership had an impact for the estimated Sustainability of offshore wind energy, its risks and chances. As hypothesized subjects belonging to wind energy associations estimated the risks for species lowest and the chances for a positive effect for CO2 reduction (and therefore for the protection of the climate) highest. The nature conservation groups estimated risks and chances conversely. The judgement of the environmental conversation groups was found between those poles. However almost no difference could be found in the abstract notion of Sustainable Development, general value orientation, and political beliefs between the subgroups of the sample. The empirical findings of the study were summarized by proposing a social psychological model of subjective perception of Sustainability. The theoretical impact of the results and the limitations of the study were discussed at the end.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Mittal, Radhika; Brüggemann, Michael;

    Working Paper Series "Sustainable Lives - Food Choices" Project website This Working Paper was presented at the 69th Annual International Communication Association (ICA) Conference 2019 in Washington, D.C.

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    https://dx.doi.org/10.25592/uh...
    Research . 2019
    License: CC BY
    Data sources: Datacite
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    https://dx.doi.org/10.25592/uh...
    Research . 2019
    License: CC BY
    Data sources: Datacite
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    B2FIND
    Research . 2019
    Data sources: B2FIND
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      Research . 2019
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      Research . 2019
      License: CC BY
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      Research . 2019
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    Authors: Mette, Barbara;

    Im Rahmen der Dissertation wurden ein Reaktordesign und eine Reaktionsführung für einen in einer offenen Prozessführung betriebenen thermochemischen Energiespeicher erarbeitet. Als Speichermaterial wurde ein binderfreier Zeolith 13X (Firma Chemiewerke Bad Köstritz) sowie neue, am ITW hergestellte Kompostmaterialien aus dem binderfreien Zeolith 13X und den Salzen Magnesiumsulfat und Calciumchlorid untersucht. Durch die Speicherung der Solarwärme in einem reversiblen Prozess (Sorption bzw. Hydratation) ist eine kompakte und nahezu verlustfreie Speicherung der Solarenergie aus den Sommermonaten bis in die Wintermonate hinein möglich. Damit kann die Effizienz der solaren Kombianlage gesteigert sowie der Anteil der solar bereitgestellten Wärme zur Gebäudebeheizung erhöht werden. Es wurden experimentelle Untersuchungen an den Speichermaterialien sowie numerische und experimentelle Untersuchungen zum Reaktordesign und zur Reaktionsführung durchgeführt. Die experimentellen Materialuntersuchungen am Einzelpartikel und im Haufwerk gaben Aufschluss über das Reaktionsgleichgewicht, über die Speicherdichte und über das makroskopische Reaktionsverhalten der Speichermaterialien. Gleichzeitig wurden durch die Materialuntersuchungen neue Erkenntnisse bezüglich des Einflusses des in den Zeolithen eingebrachten Salzes auf die Porenstruktur des Zeolithen sowie auf die Sorptionskapazität und auf das Reaktionsverhalten des Komposits gewonnen. Ein wesentliches Ergebnis war, dass die Sorptionskapazität des Komposits nur bei einem hohen Wasserdampfgehalt der Luft über der Sorptionskapazität des reinen Zeolithen lag. Bei geringeren Feuchten wurde eine deutlich verminderte Sorptionskapazität des Komposits beobachtet (Abnahme um 15 bis 30 %). Ein Grund hierfür war, dass durch das Einbringen des Salzes in den Zeolithen das Mikroporenvolumen und die Mikroporenoberfläche und damit die zur Verfügung stehende Adsorptionsoberfläche reduziert wurden. Dennoch wurde beim Komposit aus Zeolith und Magnesiumsulfat eine mit dem Zeolithen vergleichbare, ...

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  • Authors: Gehrmann, Hans-Joachim;

    Für die Optimierung eines bereits bestehenden Prozesses, z.B. im Hinblick auf den maximal möglichen Durchsatz bei gleich bleibender Qualität der Pyrolyseprodukte oder für die Einstellung der Betriebsparameter bei einem unbekannten Einsatzstoff, kann ein mathematisches Modell eine erste Abschätzung für die Einstellung betrieblicher Parameter, wie z.B. Temperaturprofile im Gas und Feststoff, geben. Darüber hinaus kann man mit einem Modell für neu zu konzipierende Anlagen konstruktive Parameter ermitteln oder überprüfen. In dem hier dargestellten vereinfachten Modellansatz werden u. a. die Umsatzvorgänge für ein Partikelkollektiv mit Hilfe von Summenparametern aus Untersuchungen an einer Thermowaage und ergänzend im Drehrohr ermittelt. Das Prozessmodell basiert auf einem Reaktormodell, das das Verweilzeitverhalten des Einsatzstoffes im Reaktor beschreibt und einem Basismodell, bestehend aus Massen- und Energiebilanzen für Solid und Gas sowie Ansätzen zur Trocknung und zum Umsatz. Im Hinblick auf die Verfügbarkeit von stoffspezifischen Daten von Abfällen sind insbesondere zur Berechnung des Verweilzeitverhaltens und des Umsatzes im Heißbetrieb vereinfachende Ansätze durch die Bildung von Summenparametern hilfreich. Das Prozessmodell wurde schrittweise validiert: Zunächst wurde in Kaltversuchen ein Summenparameter, der u.a. die unbekannten Reibungsverhältnisse im Drehrohr berücksichtigt, durch Vergleich von Experiment und Rechnung für Sand ermittelt. Für heterogene Abfallgemische kann dieser Materialfaktor zwar für Kaltversuche bestimmt werden (soweit dies für Abfälle möglich ist), im Heißbetrieb ändern sich jedoch alle wesentlichen Stoffparameter wie Partikeldurchmesser, Schüttdichte und Schüttwinkel sowie die Reibungsverhältnisse. Für diesen Fall wird der Materialfaktor zu Eins gesetzt und die wesentlichen Stoffgrößen umsatzabhängig modelliert. Dazu ist die Kenntnis der Schüttdichten, statischen Schüttwinkel und mittleren Partikeldurchmesser vom Abfall und Koks aus dem Abfall notwendig. Die mit diesen Stoffdaten ...

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    Authors: Wolf, D.; Dötsch, C.;

    Compressed Air Energy Storage (CAES) is successfully applied since decades. The report shows basic functionality of the CAES plants Huntorf and McIntosh and compares them regarding technical parameters. Special attention is paid to the retrofit of the Huntorf plant. Furthermore alternative CAES process concepts are presented and explained. Finally the adequacy of different CAES process concepts on the basis of application scenarios is discussed and evaluated.

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    Authors: S. Walter; S. Ulli-Beer; A. Wokaun;
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    Authors: Fritz, Martin;

    Der Beitrag geht der Frage nach, welche Besonderheiten Genossenschaften zu beispielhaften Akteuren der Nachhaltigkeit und nachhaltigen Arbeit machen. Dazu wird ein Begriff der Nachhaltigkeit eingeführt, in dem die drei Dimensionen des Ökonomischen, Sozialen und Ökologischen wechselseitig aufeinander bezogen sind und auf die Tätigkeit der Arbeit angewandt werden. Anschließend werden die vorwiegend in lokalen Kontexten tätigen Genossenschaften als Unternehmens- und Rechtsform vorgestellt. Wichtige Leitideen wie Kooperation, Partizipation und Autonomie werden erläutert und als spezifisch genossenschaftliche Merkmale das Identitätsprinzip sowie der Förderzweck identifiziert. Entlang der drei Nachhaltigkeitsdimensionen verdeutlichen die im Folgenden diskutierten theoretischen Argumente und empirisches Datenmaterial, wie diese beiden Prinzipien zu nachhaltiger Arbeit führen. Dabei werden auch Parallelen gezogen zu den Kriterien einer erfolgreichen Bewirtschaftung von Gemeingütern (Commons) und schließlich auf die Notwendigkeit von repräsentativen Studien zu Genossenschaften verwiesen, um Wissen darüber zu erlangen, wie deren Nachhaltigkeitspotenziale auch in anderen Unternehmensformen und über lokale Zusammenhänge hinaus genutzt werden können. This paper investigates the values and principles of cooperatives and relates them to the triple bottom line of sustainability: economic, social and ecological. Sustainable work is conceptualized in a similar way understanding the three dimensions as interdependent aspects of using resources responsibly. Furthermore, the mainly locally operating cooperatives are discussed as a legal form of a company. Their guiding principles such as solidarity, democratic participation and autonomy are introduced and two distinguishing features recognized: the identity principle and the purpose of self-help. Following the three dimensions of sustainability, the article discusses theoretical arguments and presents empirical data showing how these two principles lead to a realization of sustainable work. The paper also draws parallels between cooperatives' principles and managing the 'commons'. It concludes calling for representative surveys on cooperatives in order to learn more about how to apply cooperatives' principles in other companies and beyond local realities. AIS-Studien

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    Article . 2017
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    Publications at Bielefeld University
    Article . 2017
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    Publications at Bielefeld University
    Other literature type . 2017
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    https://dx.doi.org/10.21241/ss...
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      Article . 2017
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    Authors: Bastian, Daniel;

    This work contains investigations on the effect of powdered activated carbon (PAC) on the effluent quality and operational safety of a membrane bioreactor (MBR), as well as its effects on sewage sludge quality. The tests to detect these effects were carried out in one of the four large-scale MBRs operated in parallel at an 80.000 p.e. WWTP sewage treatment plant in Kaarst. Comparative investigations without PACs were carried out in two other MBRs. The focus was on different dosing strategies in which the PAC was dosed into the activated sludge tank in proportion to the volume flow, continuously over time and in daily pulse dosings. The cleaning performance of the PAC-MBR was improved compared to the reference. The elimination of carbon compounds and especially the adsorption of trace organic substances was significantly increased at the low PAC dosing rates of 7±5 to 10±7 gPAC/m³ influent. The mean and maximum values for nitrogen compounds in the effluent were also lower in the PAC-MBR than in the MBR without PAC, while no significant change was observed for phosphorus.At similar PAC doses, only a slight difference between the dosing strategies was discernible. Overall, the continuous dosing showed the best organic carbon and trace organic substances elimination. Daily pulse dosing showed the highest system availability for PAC dosing due to the simple dosing technology.A better filterability of the activated sludge with PAC addition could be determined and was linked to a lower content of fouling-promoting substances. In addition, a reduction in the air requirement for nitrification aeration of the PAC-MBR was observed.An improvement in the thickening of the excess sludge via sieve belt thickener was observed. The improved dewaterability of the digested sludge could be demonstrated in the laboratory in semi-technical and in the large-scale tests. During a time of PAC dosing in all four MBRs of the WWTP, a clear improvement for the dewatering efficiency in the large-scale centrifuge was achieved at the tested PAC concentrations. The cost of PAC dosing into the biological stage is not determined by the investment costs, but largely by the operating costs from PAC dosing. Considering possible savings for the wastewater levy, aeration energy and sludge disposal costs, the additional costs for PAC dosing are reduced by approx. 50 to 80 %, depending on the scenario. The investigations carried out show a high technological potential. Membrane bioreactor technology has already been state of the art for 20 years and it is complemented and completed to a considerable extent by the dosing of PAC. Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen , 2023; Aachen : RWTH Aachen University 1 Online-Ressource : Illustrationen, Diagramme (2023). = Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2023 Published by RWTH Aachen University, Aachen

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    https://dx.doi.org/10.18154/rw...
    Doctoral thesis . 2023
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    Authors: Müller, Anna-Lisa;

    This paper argues that the sustainability paradigm is currently used to transform industrial port cities into creative sustainable cities (Müller, 2013). Based on empirical data from the city of Dublin, I show that the sustainability paradigm is combined with the creative city paradigm to revitalize inner-city quarters. This urban planning strategy includes a focus on the creative class (Florida, 2004) and aims at integrating the old in the new, both in architectural and social terms. With this, it tries to be an integrative urban revitalization strategy. In the course of the 20th century, the Irish society developed from an industrial to a postindustrial, knowledge-based society (Bell, 1973; Drucker, 1993). New occupations emerged, making new forms of working spaces and modes of transport necessary, and a growing population now asks for a new kind of living spaces. Additionally, inner-city quarters have become increasingly popular with people working in knowledge-intensive industries. Consequently, city planners have initiated a revitalization process in these quarters, and they used two urban planning paradigms â creative cities (Florida, 2005) and sustainability â as guidelines for urban regeneration. This strategy aims to transform the whole city, but the single districts have to be the object of investigation when empirically approaching the changes of the built environment. Here we see that a threefold understanding of sustainability is used to integrate the demands of the new social groups in those of existing communities. Thus, the approaches used in the districts differ: (1) In The Liberties, home of a new-build technology cluster, the focus is on an economically sustainable development. (2) In Temple Bar, Dublin's cultural quarter, the emphasis is on a socially sustainable approach. (3) In the Docklands, the area of the old inner-city harbor, an attempt is made to combine all three dimensions of sustainability by creating new buildings (ecological sustainability) for both 'old' and 'new'1 inhabitants (social sustainability) and work space for growing industries like the knowledge-intensive industries (economic sustainability). The urban revitalization strategies have one thing in common: The inner-city districts dispose of a number of protected buildings which have to be integrated in the re-structuring of the quarters. Therefore, these buildings are renovated and combined with new buildings to form an architectural and spatial image of Dublin as a city with a future that is rooted in the city's industrial past. In this sense, the urban regeneration approach even has a notion of architectural and historical sustainability. San Francisco

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ E-LIB Dokumentserver...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      This Research product is the result of merged Research products in OpenAIRE.

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