1,298 research outputs found
Op het kruispunt tussen cultuur en natuur: TvMR sprak met Koen Vanmechelen
No full textIt's an interview about human rights and art with Koen Van Mechelen (a famous Belgian artist).
Na twee maanden lockdown worden de maatregelen om ons te beschermen tegen de
COVID-19 pandemie in België eindelijk wat versoepeld. Wij maken van dat moment gebruik
om kunstenaar Koen Vanmechelen te gaan interviewen in het indrukwekkende LABIOMISTA
in Genk. Koen Vanmechelen verkreeg wereldwijde bekendheid met zijn Cosmopolitan Chicken Project.
Hij kreeg onder andere dankzij dat project ook een eredoctoraat aan de UHasselt omdat hij met
zijn kunst een brug wil slaan naar de wetenschap en belangrijke maatschappelijke ontwikkelingen.
Als wereldreiziger en kosmopoliet zit hij vandaag de lockdown uit in Genk: een smeltkroes van
nationaliteiten en zo een mooie uitvalsbasis om te werken rond kunst, diversiteit en mensenrechten
Op het kruispunt tussen cultuur en natuur: TvMR sprak met Koen Vanmechelen
No full textIt's an interview about human rights and art with Koen Van Mechelen (a famous Belgian artist).
Na twee maanden lockdown worden de maatregelen om ons te beschermen tegen de
COVID-19 pandemie in België eindelijk wat versoepeld. Wij maken van dat moment gebruik
om kunstenaar Koen Vanmechelen te gaan interviewen in het indrukwekkende LABIOMISTA
in Genk. Koen Vanmechelen verkreeg wereldwijde bekendheid met zijn Cosmopolitan Chicken Project.
Hij kreeg onder andere dankzij dat project ook een eredoctoraat aan de UHasselt omdat hij met
zijn kunst een brug wil slaan naar de wetenschap en belangrijke maatschappelijke ontwikkelingen.
Als wereldreiziger en kosmopoliet zit hij vandaag de lockdown uit in Genk: een smeltkroes van
nationaliteiten en zo een mooie uitvalsbasis om te werken rond kunst, diversiteit en mensenrechten
MAES: A Multi-Agent Systems Framework for Embedded Systems
No full textMiniaturization and cost reduction of hardware components have created a trend in the space industry where the traditional centralized computer is being replaced by distributed computer architecture. However, this trend comes with a cost: the on-board software complexity of the space missions has increased. The complexity has origins in the requirements of the missions where in general, these are coordination and control-related processes. As the coordination and the control of the satellite's activities are not trivial tasks, the Multi-Agent Systems(MAS)-approach has been proposed as a new architectural style due to its distributed nature. There are several existing frameworks for implementing MAS-based applications, however, most of them are neither designed to satisfy real-time requirements nor designed to be implemented in highly-constrained embedded systems. Therefore, the purpose of this thesis is to develop a new tool for MAS-based applications: A Multi-Agent Framework for Embedded Systems (MAES).The framework was implemented on top of a Real-Time Operating System: TI-RTOS, therefore, applications implemented with MAES have realtime characteristics. Experiments have shown that the execution time of an Attitude Determination algorithm is consistent on each call with a variance value of the order of 10^5 [s^2], demonstrating the predictability of the framework. Furthermore, the user coding effort is reduced as several routines are standardized and encapsulated into MAES' API. However, the predictability and ease-of-use come with a slight cost: experiments have shown that MAES-based applications lead to an increase of 6.7 KB in average in Flash memory and 4.5 KB in average in SRAM memory with respect to its non-agent implementation. Also, the CPU utilization increases as inter-agent communication requires additional processing time, also increasing the power consumption. However, the increase is low as the results have shown that is less than 1% in average
Benzothiadiazole-based push-pull copolymers - Balancing synthetic complexity against organic solar cell efficiency
No full textThe authors thank the Research Foundation - Flanders (FWO Vlaanderen) for continuing financial support (PhD scholarship 1S98320N, projects G0D0118N, G0B2718N, 1S50820N, 11D2618N), as well as the European Research Council (ERC, grant agreement 864625)
Wavelength‐Selective Organic Photodetectors
No full textSpectroscopic sensing combined with optical imaging is crucial with respect to today's ever-growing demand for instant analytical techniques to be incorporated in various handheld and wearable devices. Further miniaturization and integration of such types of sensors is critical and wavelength-selective organic photodetectors (OPDs) may provide the required technology. In this progress report, some early OPD applications and their potential are presented. Crucial device parameters such as the specific detectivity, external quantum efficiency, and dark current density of visible and near-infrared wavelength-selective pho-todetectors are compared and assayed to theoretical and semi-empirical limits. The different organic detector approaches include the use of inherently narrow-band absorbers as well as internally filtered and microcavity devices. Each of these strategies comes with its own specific material and device design criteria, around which material development and selection should be centered to move beyond the current state of the art. As OPD technology matures, device stability becomes important and is hence also briefly discussed. Via this perspective, it is aimed to provide the reader with critical insights into the device physics and chemistry of wavelength-selective OPDs, hereby providing leverage for new ideas to bring this technology to the market. The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.202104060. manipulate the detection wavelength and transparency range. Additionally, organic photo-active materials can be deposited via thermal evaporation or from solution via inkjet printing, blade, or slot-die coating at ambient temperatures. [2] These mild depo-sition conditions allow increased flexibility in detector design on various substrates. This includes fabrication directly on complementary metal-oxide semiconductor (CMOS) readout circuits, [3,4] as well as the use of polymer substrates for lightweight and flexible detectors. [5,6] To date, photodetectors employing organic semiconductors with optical gaps spanning the visible (VIS) and near-infrared (NIR) range from 400 up to 2500 nm have been reported. [7-9] High-performance devices have been demonstrated in the VIS and significant research efforts now focus on OPDs with detection wavelengths beyond the silicon regime (> 1000 nm), which at this time requires costly inorganic materials which are not compatible with direct integration on CMOS readout circuits. [10-12] However, to be interesting for NIR applications, OPDs will need significant improvements in dark and noise currents as well as photon-to-electron conversion efficiencies. Furthermore, only a few studies exist on their long-term operational stability and degradation mechanisms. In this progress report, we discuss the status and recent progress in approaches to achieve wavelength-specific and tun-able OPDs. We focus on devices with an intrinsically narrow detection range and a rather simple device architecture and omit filtered broad-band detectors. For a full overview of the chemistry, physics, and technology of broad-band OPDs, we refer to several recent reviews. [5,8,13,14] The benefits of filter-less narrow-band OPDs are illustrated through a selection of recent proof-of-concept demonstrations. Progress in the physical and chemical methods to achieve narrow-band OPDs is reported and we discuss performance limits and how to improve the different performance parameters, including device stability. As such, we hope to provide the reader with critical insights and inspiration for the tailored design of organic semiconductors for innovative optical sensing applications. 2. Selected Proof-Of-Concept Demonstrations of Wavelength-Selective OPDs As opposed to inorganic semiconductors, organic materials can be designed to have a strongly peaked absorption centeredThe authors thank the Research Foundation—Flanders (FWO Vlaanderen) for continuing financial support (projects G0D0118N, G0B2718N, and the Ph.D. scholarship of J.V. (1S50820N)), as well as the European Research Council (ERC, grant agreement 864625). The authors also thank S. Gielen for fruitful discussions and T. Vandermeeren for proofreading the manuscript
Continuous Droplet Flow Synthesis of a Near-Infrared Responsive Push-Pull Copolymer toward Large Scale Implementation of Organic Photodetectors
No full textFlow chemistry has been shown to be an excellent tool for the production of conjugated polymers. In some cases, however, this technique reaches its limits because of viscosity increases or precipitate formation. Droplet flow can provide an answer but has not been developed yet for the state-of-the-art push-pull conjugated polymers applied in many prototype organic electronic devices. In this work, a droplet flow protocol is established for a near-infrared photoactive [1,2,5]thiadiazolo[3,4-g]quinoxaline-based alternating copolymer, representing the first implementation of flow synthesis for organic photodetector materials. High-quality polymers are obtained with an enhanced consistency in molar mass, dispersity, and photodetector performance.O.B. thanks Hasselt University for financial support. S.G. and F.V. acknowledge the Research Foundation - Flanders (FWO Vlaanderen) for granting them a PhD fellowship. P.V. is a postdoctoral fellow of the FWO Vlaanderen. W.M. and K.V. are grateful for project funding by the FWO (G0D0118N, G0B2718N, and Hercules project GOH3816NAUHL). Hasselt University and IMOMEC have been partners in the SBO project MIRIS (Monolithic Infrared Image Sensors), supported by VLAIO (Vlaams Agentschap Innoveren en Ondernemen). The authors also thank Dr. Geert Pirotte for his contribution to this project.Maes, W (corresponding author), Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium.
IMEC, Associated Lab IMOMEC, B-3590 Diepenbeek, Belgium.
[email protected]
Accepting Optimally in Automated Negotiation with Incomplete Information (abstract)
No full textIntelligent SystemsElectrical Engineering, Mathematics and Computer Scienc
Efficient and readily tuneable near-infrared photodetection up to 1500 nm enabled by thiadiazoloquinoxaline-based push–pull type conjugated polymers
No full textThe majority of bulk heterojunction near-infrared organic photodetectors (NIR-OPDs) have an absorption window up to 1000 nm (1.2 eV) due to the scarcity of suitable NIR-absorbing electron donor polymers and the challenging energy alignment and/or blend miscibility with electron acceptor materials, strongly complicating to move beyond this wavelength range. Nonetheless, extension of the detectivity further into the NIR is important for applications such as bio-imaging, pulse oximetry and industrial sorting. Herein, we illustrate that [1,2,5]thiadiazolo[3,4-g]quinoxaline (TQ) is an excellent building block for the development of ultra-low bandgap copolymers to achieve tuneable NIR photodetection beyond 1000 nm. Three TQ monomers with different side chain patterns are synthesized and combined with carefully selected electron rich subunits to yield push-pull type copolymers with an optical gap ranging from 1.14 to 0.87 eV. The highest gap material affords the best OPD performance, with a peak specific detectivity of 3 x 10(11)Jones at 960 nm (at -2 V bias). The other polymers show <1 eV optical gaps and specific detectivities exceeding 10(10)Jones up to 1400 nm (at -2 V bias). These values are among the highest reported so far for NIR-OPDs in the wavelength range beyond 1000 nm.The authors thank Drs Christina Kaiser (Swansea University) for her contribution to the frequency response and LDR measurements. F. V., S. G. and J. R. acknowledge the Research Foundation Flanders (FWO Vlaanderen) for granting them a PhD fellowship. P. V. is a postdoctoral fellow of the FWO Vlaanderen. K. V. and W. M. are grateful for project funding by the FWO (G0D0118N and G0B2718N). Hasselt University and IMOMEC are partners in the SBO project MIRIS (Monolithic Infrared Image Sensors), supported by VLAIO (Vlaams Agentschap Innoveren en Ondernemen). The authors thank Dr Geert Pirotte for his contribution to this project.Maes, W (corresponding author), UHasselt Hasselt Univ, Inst Mat Res IMO, Agoralaan 1 Bldg D, B-3590 Diepenbeek, Belgium ; IMEC, Associated Lab IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
[email protected]
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Episode #2: Interview with President Koen Lenaerts
No full textEpisode #2 of the Borderlines CJEU Series features CJEU President Koen Lenaerts in conversation with Professor Katerina Linos (Berkeley) and Professor Mark Pollack (Temple University). President Lenaerts has been re-elected to the Court’s top office by his peers three times since 2015, having served tirelessly since his nomination to the CJEU in 2003 by home country of Belgium. His interview traces the historic path to today’s Court of Justice, and illuminates differences from other courts, including the U.S. federal judicial system.Listeners will come away with an overview of the Court’s functions and structural methodology in interpreting the EU legal order, including the role of the President, the Judge rapporteur, and the Advocate General. Presidential responsibilities include assigning cases to Judges and presiding over the Grand Chamber to deal with the most important cases. New developments in case law, evolving technological access, and finding balance between unity and diversity, privacy and security, are addressed by the head of the EU’s judicial institution.President Lenaerts in total has spent 35 years as a European Union Judge, initially serving on the Court of First Instance of the European Communities (now the General Court) when it was established in 1989. He earned his legal degrees including a doctorate in Belgium and also obtained a Masters of Laws and a Masters in Public Administration from Harvard University. President Lenaerts is Professor of European Union Law at Leuven University in Belgium and a member of many legal and academic associations including the Academia Europaea, London; the Advisory Council of the British Institute of International and Comparative Law; the Advisory Board of the Centre of Law and Governance in Europe, University College London; the Governing Board of the Foundation of the Academy of European Law (ERA), Trier; and the Board of Trustees of the Max-Planck-Institut für ausländisches öffentliches Recht und Völkerrecht, Heidelberg. He is the recipient of numerous awards and author of a vast list of publications.</p
Continuous droplet flow synthesis of a near-infrared responsive push-pull copolymer toward large scale implementation of organic photodetectors
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