TY - JOUR A1 - Cheenakula, Dheeraja A1 - Paulsen, Svea A1 - Ott, Fabian A1 - Grömping, Markus T1 - Operational window of a deammonifying sludge for mainstream application in a municipal wastewater treatment plant JF - Water and Environment Journal N2 - The present work aimed to study the mainstream feasibility of the deammonifying sludge of side stream of municipal wastewater treatment plant (MWWTP) in Kaster, Germany. For this purpose, the deammonifying sludge available at the side stream was investigated for nitrogen (N) removal with respect to the operational factors temperature (15–30°C), pH value (6.0–8.0) and chemical oxygen demand (COD)/N ratio (≤1.5–6.0). The highest and lowest N-removal rates of 0.13 and 0.045 kg/(m³ d) are achieved at 30 and 15°C, respectively. Different conditions of pH and COD/N ratios in the SBRs of Partial nitritation/anammox (PN/A) significantly influenced both the metabolic processes and associated N-removal rates. The scientific insights gained from the current work signifies the possibility of mainstream PN/A at WWTPs. The current study forms a solid basis of operational window for the upcoming semi-technical trails to be conducted prior to the full-scale mainstream PN/A at WWTP Kaster and WWTPs globally. KW - Anammox KW - Mainstream KW - Nitrogen removal KW - Partial nitritation KW - Wastewater Y1 - 2023 U6 - http://dx.doi.org/10.1111/wej.12898 SN - 1747-6593 N1 - Corresponding author: Dheeraja Cheenakula IS - Early View SP - 1 EP - 12 PB - Wiley CY - Chichester ER - TY - JOUR A1 - Hoffstadt, Kevin A1 - Cheenakula, Dheeraja A1 - Nikolausz, Marcell A1 - Krafft, Simone A1 - Harms, Hauke A1 - Kuperjans, Isabel T1 - Design and construction of a new reactor for flexible biomethanation of hydrogen JF - Fermentation N2 - The increasing share of renewable electricity in the grid drives the need for sufficient storage capacity. Especially for seasonal storage, power-to-gas can be a promising approach. Biologically produced methane from hydrogen produced from surplus electricity can be used to substitute natural gas in the existing infrastructure. Current reactor types are not or are poorly optimized for flexible methanation. Therefore, this work proposes a new reactor type with a plug flow reactor (PFR) design. Simulations in COMSOL Multiphysics ® showed promising properties for operation in laminar flow. An experiment was conducted to support the simulation results and to determine the gas fraction of the novel reactor, which was measured to be 29%. Based on these simulations and experimental results, the reactor was constructed as a 14 m long, 50 mm diameter tube with a meandering orientation. Data processing was established, and a step experiment was performed. In addition, a kLa of 1 h−1 was determined. The results revealed that the experimental outcomes of the type of flow and gas fractions are in line with the theoretical simulation. The new design shows promising properties for flexible methanation and will be tested. KW - methanation KW - plug flow reactor KW - bubble column KW - bio-methane KW - power-to-gas Y1 - 2023 U6 - http://dx.doi.org/10.3390/fermentation9080774 SN - 2311-5637 N1 - The article belongs to the Special Issue Fermentation Processes: Modeling, Optimization and Control VL - 9 IS - 8 SP - 1 EP - 16 PB - MDPI CY - Basel ER - TY - JOUR A1 - Grajewski, Matthias A1 - Kleefeld, Andreas T1 - Detecting and approximating decision boundaries in low-dimensional spaces JF - Numerical Algorithms N2 - A method for detecting and approximating fault lines or surfaces, respectively, or decision curves in two and three dimensions with guaranteed accuracy is presented. Reformulated as a classification problem, our method starts from a set of scattered points along with the corresponding classification algorithm to construct a representation of a decision curve by points with prescribed maximal distance to the true decision curve. Hereby, our algorithm ensures that the representing point set covers the decision curve in its entire extent and features local refinement based on the geometric properties of the decision curve. We demonstrate applications of our method to problems related to the detection of faults, to multi-criteria decision aid and, in combination with Kirsch’s factorization method, to solving an inverse acoustic scattering problem. In all applications we considered in this work, our method requires significantly less pointwise classifications than previously employed algorithms. KW - MCDA KW - Inverse scattering problem KW - Fault approximation KW - Fault detection Y1 - 2023 SN - 1572-9265 N1 - Corresponding author: Matthias Grajewski VL - 93 IS - 4 PB - Springer Science+Business Media CY - Dordrecht ER - TY - THES A1 - Leßmann, Mika T1 - Designing confidence : eine patient:innenzentrierte Intervention für belastende Behandlungssituationen - am Beispiel von Strahlentherapie N2 - Krebstherapie bei Kindern ist für alle Beteiligten eine emotional bedrückende Angelegenheit. Besonders die Strahlentherapie stellt Kinder aufgrund der Häufigkeit der Termine, der Isolation während der Bestrahlung und der Fixierung vor Herausforderungen. „nia“ ermöglicht es den Angehörigen, während der Behandlung einen physischen Kontakt zum Kind zu halten. Zwei miteinander verbundene Zwillingsgeräte registrieren die Bewegungen der Hände und übertragen die Berührung an das jeweils andere Gerät. Diese taktile Kommunikation sorgt für innere Ruhe und Verbundenheit. Vor der eigentlichen Therapie liegen die Geräte in einem Koffer, welcher ein Modell des Behandlungsraums beinhaltet. Mithilfe dessen werden die Kinder spielerisch auf die Bestrahlung vorbereitet. So sollen sich in Zukunft weniger Kinder ängstlich und allein einer Strahlentherapie stellen müssen. KW - Produktdesign KW - Medizindesign KW - Krebs KW - Kinder KW - Emotionen Y1 - 2023 PB - FH Aachen CY - Aachen ER - TY - THES A1 - Nahrings, Laura Aileen T1 - Seamless Connection : die Integration eines smarten WLAN Routers in die Wohnumgebung N2 - In Deutschland verfügen mehr als 95 % aller Haushalte über einen Internetzugang und das Interesse an Smart Home Anwendungen steigt. Je vernetzter das Zuhause wird, desto mehr Devices müssen dort ihren Platz finden. WLAN Router wirken durch ihre technische Designsprache meist wie Fremdkörper im Raum, sodass oft versucht wird, sie zu verstecken. Das soll sich mit „Cobo“, dem smarten WLAN Router, ändern. Neben der Bereitstellung einer Internetanbindung wird er zum Hub für alle Smart Home Anwendungen. Als Herzstück des Zuhauses sorgt er für die Vernetzung aller Devices und schafft zudem eine Verbindung zwischen Technologie und Interior. Mit seinem minimalistischen Design und der gezielten Auswahl an Materialien und Farben fügt sich der intelligente Router in die eigenen vier Wände ein. „Cobo“ ist kein WLAN Router, der im Schuhregal versteckt werden muss, denn er wird zum Teil der Einrichtung. KW - Router KW - Wifi KW - Smarthome KW - Produktdesign KW - Seamlessconnection Y1 - 2023 PB - FH Aachen CY - Aachen ER - TY - THES A1 - Rabe, Leonie Maria T1 - Wohlfühlen in den eigenen vier Wänden : ein Produkt, welches die Wohn- und Lebensqualität steigert. N2 - Viele Menschen fühlen sich in ihren eigenen vier Wänden nicht wohl. Sie sind gestresst und können nicht entspannen. Ziel dieser Arbeit ist es, ein Produkt zu erschaffen, welches in seinen Funktionen und seinem Design dafür sorgt, dass die Nutzer:innen sich zu Hause wohler fühlen. Es soll alle Funktionen vereinen, die dafür sorgen, dass der Alltagsstress besser bewältigt werden kann und man in seinem Zuhause entspannen kann und den Moment mehr genießt. Entstanden ist Iwa, ein Produkt, welches zum einen als Luftreiniger arbeitet und die Raumluft filtert und im Zusammenspiel mit Licht und Musik die Raumatmosphäre verbessert und so Stress mindert. Das Design soll genau wie die Funktionen beruhigend, entspannend und erdend wirken. Es ist angelehnt am Zen-Design. So bietet Iwa einen großen Mehrwert. Die Funktionen sorgen im Zusammenspiel mit dem Design für eine verbesserte Wohn- und Lebensqualität. KW - Raumatmosphäre KW - entspannen KW - Zen KW - Luftreiniger KW - Licht Y1 - 2023 PB - FH Aachen CY - Aachen ER - TY - JOUR A1 - Luft, Angela A1 - Bremen, Sebastian A1 - Luft, Nils T1 - A cost/benefit and flexibility evaluation framework for additive technologies in strategic factory planning JF - Processes N2 - There is a growing demand for more flexibility in manufacturing to counter the volatility and unpredictability of the markets and provide more individualization for customers. However, the design and implementation of flexibility within manufacturing systems are costly and only economically viable if applicable to actual demand fluctuations. To this end, companies are considering additive manufacturing (AM) to make production more flexible. This paper develops a conceptual model for the impact quantification of AM on volume and mix flexibility within production systems in the early stages of the factory-planning process. Together with the model, an application guideline is presented to help planners with the flexibility quantification and the factory design process. Following the development of the model and guideline, a case study is presented to indicate the potential impact additive technologies can have on manufacturing flexibility Within the case study, various scenarios with different production system configurations and production programs are analyzed, and the impact of the additive technologies on volume and mix flexibility is calculated. This work will allow factory planners to determine the potential impacts of AM on manufacturing flexibility in an early planning stage and design their production systems accordingly. KW - additive manufacturing KW - factory planning KW - manufacturing flexibility KW - volume flexibility KW - mix flexibility Y1 - 2023 U6 - http://dx.doi.org/10.3390/pr11071968 SN - 2227-9717 VL - 11 IS - 7 PB - MDPI CY - Basel ER - TY - JOUR A1 - Janus, Kevin Alexander A1 - Achtsnicht, Stefan A1 - Tempel, Laura A1 - Drinic, Aleksaner A1 - Kopp, Alexander A1 - Keusgen, Michael A1 - Schöning, Michael Josef T1 - Influence of fibroin membrane composition and curing parameters on the performance of a biodegradable enzymatic biosensor manufactured from Silicon-Free Carbon JF - Physica status solidi : pss. A, Applications and materials science N2 - Herein, fibroin, polylactide (PLA), and carbon are investigated for their suitability as biocompatible and biodegradable materials for amperometric biosensors. For this purpose, screen-printed carbon electrodes on the biodegradable substrates fibroin and PLA are modified with a glucose oxidase membrane and then encapsulated with the biocompatible material Ecoflex. The influence of different curing parameters of the carbon electrodes on the resulting biosensor characteristics is studied. The morphology of the electrodes is investigated by scanning electron microscopy, and the biosensor performance is examined by amperometric measurements of glucose (0.5–10 mM) in phosphate buffer solution, pH 7.4, at an applied potential of 1.2 V versus a Ag/AgCl reference electrode. Instead of Ecoflex, fibroin, PLA, and wound adhesive are tested as alternative encapsulation compounds: a series of swelling tests with different fibroin compositions, PLA, and Ecoflex has been performed before characterizing the most promising candidates by chronoamperometry. Therefore, the carbon electrodes are completely covered with the particular encapsulation material. Chronoamperometric measurements with H2O2 concentrations between 0.5 and 10 mM enable studying the leakage current behavior. KW - amperometric biosensors KW - biocompatible KW - biodegradabl KW - encapsulation materials KW - fibroin Y1 - 2023 U6 - http://dx.doi.org/10.1002/pssa.202300081 SN - 1862-6300 (Print) SN - 1862-6319 (Online) N1 - Corresponding author: Michael J. Schöning VL - 220 IS - 22 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Falkenberg, Fabian A1 - Voß, Leonie A1 - Bott, Michael A1 - Bongaerts, Johannes A1 - Siegert, Petra T1 - New robust subtilisins from halotolerant and halophilic Bacillaceae JF - Applied Microbiology and Biotechnology N2 - The aim of the present study was the characterisation of three true subtilisins and one phylogenetically intermediate subtilisin from halotolerant and halophilic microorganisms. Considering the currently growing enzyme market for efficient and novel biocatalysts, data mining is a promising source for novel, as yet uncharacterised enzymes, especially from halophilic or halotolerant Bacillaceae, which offer great potential to meet industrial needs. Both halophilic bacteria Pontibacillus marinus DSM 16465ᵀ and Alkalibacillus haloalkaliphilus DSM 5271ᵀ and both halotolerant bacteria Metabacillus indicus DSM 16189 and Litchfieldia alkalitelluris DSM 16976ᵀ served as a source for the four new subtilisins SPPM, SPAH, SPMI and SPLA. The protease genes were cloned and expressed in Bacillus subtilis DB104. Purification to apparent homogeneity was achieved by ethanol precipitation, desalting and ion-exchange chromatography. Enzyme activity could be observed between pH 5.0–12.0 with an optimum for SPPM, SPMI and SPLA around pH 9.0 and for SPAH at pH 10.0. The optimal temperature for SPMI and SPLA was 70 °C and for SPPM and SPAH 55 °C and 50 °C, respectively. All proteases showed high stability towards 5% (w/v) SDS and were active even at NaCl concentrations of 5 M. The four proteases demonstrate potential for future biotechnological applications. KW - Biotechnological application KW - Bacillaceae KW - Subtilisin KW - Subtilases KW - Halotolerant protease Y1 - 2023 U6 - http://dx.doi.org/10.1007/s00253-023-12553-w SN - 1432-0614 N1 - Corresponding author: Petra Siegert VL - 107 SP - 3939 EP - 3954 PB - Springer Nature CY - Berlin ER - TY - BOOK A1 - Sept, Marcel A1 - Zillinger, Christina A1 - Wiechert, Johanna A1 - Thelen, Marius ED - Kroll-Ludwigs, Kathrin ED - Bassen-Metz, Yasmine ED - Bernecker, Andreas ED - Eggert, Mathias ED - Fritz, Thomas ED - Golland, Alexander ED - Höhne, Tim ED - Tran, Duc Hung ED - Vogt, Jürgen T1 - Aachener Online-Schriften Wirtschaft und Recht. Band 6. 01/2023 N2 - Inhaltsverzeichnis - Bachelorarbeiten 1. Zukunft der Rente – Kann eine Erwerbstätigenversicherung das demografische Problem nachhaltig lösen? - Marcel Sept | Seite 4-73 2. Die versammlungsgebundenen Aktionärsrechte in der neuen virtuellen Hauptversammlung – eine Bewertung aus Unternehmer- und Aktionärssicht - Christina Zillinger | Seite 74-130 3. Praxisleitfaden für den Arbeitgeber zum gesetzlichen Sonderkündigungsschutz – Was muss der Arbeitgeber tun, um durch Gesetz besonders geschützten Arbeitnehmern kündigen zu können? - Johanna Wiechert | Seite 131-195 4. Die Steuervergünstigung bei Umstrukturierungen im Konzern nach § 6a GrEStG im Lichte der aktuellen Rechtsprechung - Marius Thelen | Seite 196-265 T3 - Aachener Online-Schriften Wirtschaft und Recht - 6 Y1 - 2023 PB - FH Aachen / Fachbereich Wirtschaftswissenschaften CY - Aachen ER -