TY  - JOUR
A1  - Tix, Julian
A1  - Gotthardt, Leon
A1  - Bode, Joshua
A1  - Karabacak, Burak
A1  - Nordmann, Janne
A1  - Hengsbach, Jan-Niklas
A1  - Ulber, Roland
A1  - Tippkötter, Nils
T1  - Enhancement of succinic acid production by Actinobacillus succinogenes in an electro-bioreactor
JF  - Fermentation
N2  - This work examines the electrochemically enhanced production of succinic acid using the bacterium Actinobacillus succinogenes. The principal objective is to enhance the metabolic potential of glucose and CO2 utilization via the C4 pathway in order to synthesize succinic acid. We report on the development of an electro-bioreactor system to increase succinic acid production in a power-2-X approach. The use of activated carbon fibers as electrode surfaces and contact areas allows A. succinogenes to self-initiate biofilm formation. The integration of an electrical potential into the system shifts the redox balance from NAD+ to NADH, increasing the efficiency of metabolic processes. Mediators such as neutral red facilitate electron transfer within the system and optimize the redox reactions that are crucial for increased succinic acid production. Furthermore, the role of carbon nanotubes (CNTs) in electron transfer was investigated. The electro-bioreactor system developed here was operated in batch mode for 48 h and showed improvements in succinic acid yield and concentration. In particular, a run with 100 µM neutral red and a voltage of −600 mV achieved a yield of 0.7 gsuccinate·gglucose−1. In the absence of neutral red, a higher yield of 0.72 gsuccinate·gglucose−1 was achieved, which represents an increase of 14% compared to the control. When a potential of −600 mV was used in conjunction with 500 µg∙L−1 CNTs, a 21% increase in succinate concentration was observed after 48 h. An increase of 33% was achieved in the same batch by increasing the stirring speed. These results underscore the potential of the electro-bioreactor system to markedly enhance succinic acid production.
KW  - A. succinogenes
KW  - power-to-X
KW  - electrofermentation
KW  - electro-bioreactor
KW  - succinate
Y1  - 2024
U6  - https://doi.org/10.3390/fermentation10100504
SN  - 2311-5637
N1  - Corresponding author: Nils Tippkötter
N1  - This article belongs to the Special Issue "Advance in Microbial Electrochemical Technologies"
VL  - 10
IS  - 10
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Ziemons, Karl
A1  - Auffray, Etiennette
A1  - Barbier, Rémi
A1  - Brandenburg, G.
A1  - Bruyndonckx, Peter
A1  - Choi, Yong
A1  - Christ, Daniela
A1  - Costes, Nicolas
A1  - Déclais, Yves R. A.
A1  - Devroede, Olivier
A1  - Dujardin, Christophe
A1  - Fedorovd, A.
A1  - Heinrichs, U.
A1  - Korzhik, Mikhail V.
A1  - Krieguer, Magalie
A1  - Kuntner, Claudia
A1  - Largeron, G.
A1  - Lartizien, Carole
A1  - Larue, H.
A1  - Lecoq, Paul R.
A1  - Vieira, Jean Marc
T1  - The ClearPET™ project: Development of a 2nd generation high-performance small animal PET scanner
JF  - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
N2  - Second generation high-performance PET scanners, called ClearPET™1, have been developed by working groups of the Crystal Clear Collaboration (CCC). High sensitivity and high spatial resolution for the ClearPET camera is achieved by using a phoswich arrangement combining two different types of lutetium-based scintillator materials: LSO from CTI and LuYAP:Ce from the CCC (ISTC project). In a first ClearPET prototype, phoswich arrangements of 8×8 crystals of 2×2×10 mm3 are coupled to multi-channel photomultiplier tubes (Hamamatsu R7600). A unit of four PMTs arranged in-line represents one of 20 sectors of the ring design. The opening diameter of the ring is 120 mm, the axial detector length is 110 mm.The PMT pulses are digitized by free-running ADCs and digital data processing determines the gamma energy, the phoswich layer and even the exact pulse starting time, which is subsequently used for coincidence detection. The gantry allows rotation of the detector modules around the field of view.

Preliminary data shows a correct identification of the crystal layer about (98±1)%. Typically the energy resolution is (23.3±0.5)% for the luyap layer and (15.4±0.4)% for the lso layer. early studies showed the timing resolution of 2 ns FWHM and 4.8 ns FWTM. the intrinsic spatial resolution ranges from 1.37 mm to 1.61 mm full-width of half-maximum (FWHM) with a mean of 1.48 mm FWHM. further improvements in image and energy resolution are expected when the system geometry is fully modeled.
Y1  - 2005
SN  - 0168-9002
N1  - Proceedings of the 7th International Conference on Inorganic Scintillators and their Use in Scientific and Industrial Applications
VL  - 537
IS  - 1-2
SP  - 307
EP  - 311
ER  - 
TY  - JOUR
A1  - Auffray, Etiennette
A1  - Bruyndonckx, Peter
A1  - Devroede, Olivier
A1  - Fedorov, Andrei A.
A1  - Ziemons, Karl
A1  - Heinrichs, U.
A1  - Korjik, Mikhail V.
A1  - Krieguer, Magalie
A1  - Kuntner, Claudia
A1  - Lartizien, Carole
A1  - Lecoq, Paul R.
A1  - Léonard, Sophie M. A.
A1  - Morel, Christian
A1  - Mosset, Jean-Baptiste
A1  - Pédrini, Christian
A1  - Petrosian, A. G.
A1  - Pietrzyk, Uwe K.
A1  - Rey, Martin
A1  - Saladino, S.
A1  - Sappey-Marinier, D.
A1  - Simon, Luc
T1  - The ClearPET project
JF  - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
N2  - The Crystal Clear Collaboration has designed and is building a high-resolution small animal PET scanner. The design is based on the use of the Hamamatsu R7600-M64 multi-anode photomultiplier tube and a LSO/LuYAP phoswich matrix with one to one coupling between the crystals and the photo-detector. The complete system will have 80 PM tubes in four rings with an inner diameter of 137 mm and an axial field of view of 110 mm. The PM pulses are digitized by free-running ADCs and digital data processing determines the gamma energy, the phoswich layer and even the pulse arrival time. Single gamma interactions are recorded and coincidences are found by software. The gantry allows rotation of the detector modules around the field of view. Simulations, and measurements a 2×4 module test set-up predict a spatial resolution of 1.5 mm in the centre of the field of view and a sensitivity of 5.9% for a point source in the centre of the field of view.
Y1  - 2004
SN  - 0168-9002
N1  - Proceedings of the 2nd International Conference on Imaging Technologies in Biomedical Sciences
VL  - 527
IS  - 1-2
SP  - 171
EP  - 174
ER  - 
TY  - JOUR
A1  - Chwallek, Constanze
A1  - Nawrath, Lara
A1  - Krastina, Anzelika
A1  - Bruksle, Ieva
T1  - Supportive research on sustainable entrepreneurship and business practices
JF  - SECA Sustainable Entrepreneurship for Climate Action
Y1  - 2024
SN  - 978-952-316-514-4 (pdf)
SN  - 2954-1654 (on-line publication)
IS  - 3
PB  - Lapland University of Applied Sciences Ltd
CY  - Rovaniemi
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
T1  - Echtzeit-Ethernet mit Standardtechnik
JF  - Elektronik : Fachmedium für industrielle Anwender und Entwickler ; Sonderh. Embedded : Fachmagazin für die Entwicklung von Embedded-Systemen
Y1  - 2014
SN  - 0013-5658
VL  - Bd. 63
IS  - H. 12
SP  - 28
EP  - 32
PB  - WEKA-Fachmedien
CY  - Haar
ER  - 
TY  - JOUR
A1  - Braun, Sebastian
A1  - Cheng, Chi-Tsun
A1  - Dowey, Steve
A1  - Wollert, Jörg F.
T1  - Performance evaluation of skill-based order-assignment in production environments with multi-agent systems
JF  - IEEE Journal of Emerging and Selected Topics in Industrial Electronics
N2  - The fourth industrial revolution introduces disruptive technologies to production environments. One of these technologies are multi-agent systems (MASs), where agents virtualize machines. However, the agent's actual performances in production environments can hardly be estimated as most research has been focusing on isolated projects and specific scenarios. We address this gap by implementing a highly connected and configurable reference model with quantifiable key performance indicators (KPIs) for production scheduling and routing in single-piece workflows. Furthermore, we propose an algorithm to optimize the search of extrema in highly connected distributed systems. The benefits, limits, and drawbacks of MASs and their performances are evaluated extensively by event-based simulations against the introduced model, which acts as a benchmark. Even though the performance of the proposed MAS is, on average, slightly lower than the reference system, the increased flexibility allows it to find new solutions and deliver improved factory-planning outcomes. Our MAS shows an emerging behavior by using flexible production techniques to correct errors and compensate for bottlenecks. This increased flexibility offers substantial improvement potential. The general model in this paper allows the transfer of the results to estimate real systems or other models.
KW  - cyber-physical production systems
KW  - event-based simulation
KW  - multi-agent systems
KW  - digital factory
KW  - industrial agents
Y1  - 2021
U6  - https://doi.org/10.1109/JESTIE.2021.3108524
SN  - 2687-9735
IS  - Early Access
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
A1  - Kruse, Thomas
A1  - Vedral, Andreas
T1  - Die Kraft der drei Antennen : zuverlässige Funkkommunikation für die Automatisierungstechnik
JF  - Elektronik : Fachmedium für industrielle Anwender und Entwickler ; Sonderh. Wireless : Fachmedium für Entwicklungen funkbasierter Systeme
Y1  - 2007
SN  - 0013-5658; 1611-5120
N1  - Printausgabe in der Bibliothek vorhanden: 23 Z 133; 63 ZS 035
VL  - 56
IS  - Sonderh. 2
SP  - 36
EP  - 42
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
T1  - Betriebssysteme im Wettlauf : Elan-Entwicklungsboard mit Win CE und QNX
JF  - Elektronik : Fachmedium für industrielle Anwender und Entwickler
Y1  - 1999
SN  - 0013-5658
N1  - Printausg. in der Bibliothek vorhanden: 63 ZS 030
VL  - Bd. 48
IS  - H. 11
SP  - 86
EP  - 91
ER  - 
TY  - JOUR
A1  - Ulmer, Jessica
A1  - Braun, Sebastian
A1  - Cheng, Chi-Tsun
A1  - Dowey, Steve
A1  - Wollert, Jörg F.
T1  - Gamification of virtual reality assembly training: Effects of a combined point and level system on motivation and training results
JF  - International Journal of Human-Computer Studies
N2  - Virtual Reality (VR) offers novel possibilities for remote training regardless of the availability of the actual equipment, the presence of specialists, and the training locations. Research shows that training environments that adapt to users' preferences and performance can promote more effective learning. However, the observed results can hardly be traced back to specific adaptive measures but the whole new training approach. This study analyzes the effects of a combined point and leveling VR-based gamification system on assembly training targeting specific training outcomes and users' motivations. The Gamified-VR-Group with 26 subjects received the gamified training, and the Non-Gamified-VR-Group with 27 subjects received the alternative without gamified elements. Both groups conducted their VR training at least three times before assembling the actual structure. The study found that a level system that gradually increases the difficulty and error probability in VR can significantly lower real-world error rates, self-corrections, and support usages. According to our study, a high error occurrence at the highest training level reduced the Gamified-VR-Group's feeling of competence compared to the Non-Gamified-VR-Group, but at the same time also led to lower error probabilities in real-life. It is concluded that a level system with a variable task difficulty should be combined with carefully balanced positive and negative feedback messages. This way, better learning results, and an improved self-evaluation can be achieved while not causing significant impacts on the participants' feeling of competence.
KW  - Gamification
KW  - Virtual reality
KW  - Assembly
KW  - User study
KW  - Level system
Y1  - 2022
U6  - https://doi.org/10.1016/j.ijhcs.2022.102854
SN  - 1071-5819
VL  - 165
IS  - Art. No. 102854
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Ulmer, Jessica
A1  - Braun, Sebastian
A1  - Cheng, Chi-Tsun
A1  - Dowey, Steve
A1  - Wollert, Jörg F.
T1  - A human factors-aware assistance system in manufacturing based on gamification and hardware modularisation
JF  - International Journal of Production Research
N2  - Assistance systems have been widely adopted in the manufacturing sector to facilitate various processes and tasks in production environments. However, existing systems are mostly equipped with rigid functional logic and do not provide individual user experiences or adapt to their capabilities. This work integrates human factors in assistance systems by adjusting the hardware and instruction presented to the workers’ cognitive and physical demands. A modular system architecture is designed accordingly, which allows a flexible component exchange according to the user and the work task. Gamification, the use of game elements in non-gaming contexts, has been further adopted in this work to provide level-based instructions and personalised feedback. The developed framework is validated by applying it to a manual workstation for industrial assembly routines.
KW  - Human factors
KW  - assistance system
KW  - gamification
KW  - adaptive systems
KW  - manufacturing
Y1  - 2023
U6  - https://doi.org/10.1080/00207543.2023.2166140
SN  - 0020-7543 (Print)
SN  - 1366-588X (Online)
PB  - Taylor & Francis
ER  - 
TY  - JOUR
A1  - Ulmer, Jessica
A1  - Braun, Sebastian
A1  - Cheng, Chi-Tsun
A1  - Dowey, Steve
A1  - Wollert, Jörg F.
T1  - Human-Centered Gamification Framework for Manufacturing Systems
JF  - Procedia CIRP
N2  - While bringing new opportunities, the Industry 4.0 movement also imposes new challenges to the manufacturing industry and all its stakeholders. In this competitive environment, a skilled and engaged workforce is a key to success. Gamification can generate valuable feedbacks for improving employees’ engagement and performance. Currently, Gamification in workspaces focuses on computer-based assignments and training, while tasks that require manual labor are rarely considered. This research provides an overview of Enterprise Gamification approaches and evaluates the challenges. Based on that, a skill-based Gamification framework for manual tasks is proposed, and a case study in the Industry 4.0 model factory is shown.
Y1  - 2020
U6  - https://doi.org/10.1016/j.procir.2020.04.076
SN  - 2212-8271
VL  - 93
SP  - 670
EP  - 675
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
T1  - Alles automatisch : komplexes qualitätsorientiertes Logistikmanagement durch Vollautomatisierung
JF  - Elektrotechnik für die Automatisierung
Y1  - 1998
SN  - 0013-581X
VL  - Bd. 80
IS  - H. 4
SP  - 196
EP  - 199
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
A1  - Booke, Andreas
T1  - IoT von der Stange
JF  - elektronik
N2  - Heute sollte am besten jedes Gerät in die große Rechnerwolke eingebettet werden. Doch so einfach ist das nicht, denn Cloud ist viel mehr als nur das Internet der Dinge. Als Anwender muss man sich also fragen, welche Dienste man möchte und welchem Anbieter man sein Vertrauen schenkt.
KW  - Einbetten in das Internet der Dinge
Y1  - 2016
IS  - 21 (2016)
SP  - 30
EP  - 37
PB  - WEKA-Fachmedien
CY  - München
ER  - 
TY  - JOUR
A1  - Ziemons, Karl
A1  - Bruyndonckx, Peter
A1  - Perez, Jose M.
A1  - Pietrzyk, Uwe
A1  - Rato, P.
A1  - Tavernier, Stefaan
T1  - Beyond ClearPET: Next Aims
JF  - 5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro Symposium Proceedings ISBI 2008
N2  - The CRYSTAL CLEAR collaboration, in short CCC, is a consortium of 12 academic institutions, mainly from Europe, joining efforts in the area of developing instrumentation for nuclear medicine and medical imaging. In the framework of the CCC a high performance small animal PET system, called ClearPET, was developed by using new technologies in electronics and crystals in a phoswich arrangement combining two types of lutetium- based scintillator materials: LSO:Ce and LuYAP:Ce. Our next aim will be the development of hybrid image systems. Hybrid MR-PET imaging has many unique advantages for brain research. This has sparked a new research line within CCC for the development of novel MR-PET compatible technologies. MRI is not as sensitive as PET but PET has poorer spatial resolution than MRI. Two major advantages of PET are sensitivity and its ability to acquire metabolic information. To assess these innovations, the development of a 9.4T hybrid animal MR-PET scanner is proposed based on an existing 9.4T MR scanner that will be adapted to enable simultaneous acquisition of MR and PET data using cutting- edge technology for both MR and PET.
Y1  - 2008
SN  - 978-1-4244-2003-2
SP  - 1421
EP  - 1424
ER  - 
TY  - JOUR
A1  - Wedrowski, Mateusz
A1  - Bruyndonckx, Peter
A1  - Tavernier, Stefaan
A1  - Zhi, Li
A1  - Dang, Jun
A1  - Mendes, Pedro Rato
A1  - Perez, Jose Manuel
A1  - Ziemons, Karl
T1  - Robustness of neural networks algorithm for gamma detection in monolithic block detector, positron emission tomography
JF  - 2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC)
N2  - The monolithic scintillator block approach for gamma detection in the Positron Emission Tomography (PET) avoids estimating Depth of Interaction (DOI), reduces dead zones in detector and diminishes costs of detector production. Neural Networks (NN) are very efficient to determine the entrance point of a gamma incident on a scintillator block. This paper presents results on the robustness of the spatial resolution as a function of the random fraction in the data, temperature and HV fluctuations. This is important when implementing the method in a real scanner. Measurements were done with two Hamamatsu S8550 APD arrays, glued on a 20 × 20 × 10 mm3 monolithic LSO crystal block.
Y1  - 2009
SN  - 1082-3654
SP  - 2625
EP  - 2628
ER  - 
TY  - JOUR
A1  - Ulber, Roland
A1  - Tippkötter, Nils
A1  - Buchholz, Heinrich
A1  - Demmer, W.
A1  - Scheper, T.
T1  - Innovative Verfahren in der Molkeaufarbeitung zur Gewinnung neuer Produkte
JF  - Deutsche Milchwirtschaft
Y1  - 2008
SN  - 0012-0480
VL  - 59
IS  - 19
SP  - 704
EP  - 706
ER  - 
TY  - JOUR
A1  - Hoffschmidt, Bernhard
A1  - Buck, Reiner
A1  - Fend, Thomas
A1  - Pitz-Paal, Robert
A1  - Rietbrock, P.
T1  - Porous materials as volumetric solar receivers : experimental approach towards a detailed characterisation of instability problems / R. Buck ; T. Fend ; B. Hoffschmidt ...
JF  - Forschungsbericht : DLR FB. 10 (2001)
Y1  - 2001
SN  - 0939-2963
N1  - 2. ISSN: 1434-8454 ; Kölner Sonnenkolloquium <5, 2001, Köln> ; Solar thermal power plants and solar chemical processes : advances and perspectives for international cooperation
SP  - 71
EP  - 72
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
T1  - Bluetooth aktuell - Technik und Anwendungen ; 8: Anwendungs-Profile
JF  - Elektronik : Fachmedium für industrielle Anwender und Entwickler
Y1  - 2001
SN  - 0013-5658
N1  - Printausg. in der Bibliothek vorhanden: 63 ZS 030
VL  - Bd. 50
IS  - H. 25
SP  - 66
EP  - 73
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
T1  - Wireless in industriellen Anwendungen
JF  - Elektronik : Fachmedium für industrielle Anwender und Entwickler ; Sonderh. Scout : Leitfaden für Elektronik-Entwickler
Y1  - 2007
SN  - 1863-3420
SP  - 40
EP  - 46
ER  - 
TY  - JOUR
A1  - Wollert, Jörg F.
T1  - Rapid Application Development
JF  - Design & Elektronik
N2  - Das IoT ist ohne eingebettete Systeme undenkbar. Erst kleine und kleinste Mikrocontroller mit intelligenten Kommunikationsschnittstellen und Anbindung ans Internet ermöglichen sinnvolles und flächendeckendes Einsammeln von Daten. Doch wie kompliziert ist der Einstieg in die Embedded-Welt? Dieser Artikel gibt Einblick, wie die »Arduino-Plattform« die Einstiegshürden für eingebettete Systeme dramatisch reduzieren kann.
Y1  - 2016
SN  - 0933-8667
IS  - 4
SP  - 8
EP  - 11
PB  - WEKA-Fachmedien
CY  - München
ER  -