1,492 research outputs found
Correction: "Density Functional Theory and Experimental Determination of Band Gaps and Lattice Parameters in Kesterite Cu2ZnSn(SxSe1-x)(4)" (vol 11, pg 10463, 2020)
No full textThe authors regret that one of their coauthors, Oliver S. Hutter, was omitted from the original publication due to an oversight. Dr. Hutter was responsible for performing a large part of the experiments on bulk crystalline materials. The authors therefore take this opportunity to include Dr. Hutter on the author list and extend their apologies to him for the earlier oversight
Do something good: teach
No full textDo something good. That was the advice Jack Hutter received from a high school teacher. Hutter thought he would do good as a lawyer. But eventually, he was drawn to the classroom
Managing food safety and hygiene: governance and regulation as risk management
No full textFood safety and hygiene is of critical importance to us all. In this wide ranging book, Bridget Hutter explores how we are all dependent on others to ensure that the food we consume from food in the retailing and hospitality sectors is safe. This has prompted a governance system embracing state regulation and groups beyond the state such as consumers, insurance, media and businesses themselves. The book argues that state regulation is ‘necessary but not sufficient’ as an influence on business risk management practices. Using research data from the UK, the author examines the relative importance of these other groups, in relation to each other and in relation to state regulation
Revealing the Fate of Photo-Generated Charges in Metal Halide Perovskites
No full textIn this thesis, we have investigated the optoelectronic properties of metal halide perovskites with a special focus on their application in solar cells. In less than a decade of development, metal halide perovskites have yielded solar cells with efficiencies comparable to commercialized technologies. However, there has been limited knowledge about the fundamental properties of these materials. As mentioned in the introduction, the efficiency of perovskite-based solar cells is still not at its theoretical limit. In order to rationally design solar cells with maximized efficiencies, we need to understand which factors are currently limiting the performance of perovskite-based solar cells. In general, one of the first important processes in a solar cell is the absorption of light. For metal halide perovskites based on lead iodide, a thickness of 0.3 micrometer is already sufficient to absorb a substantial amount of visible (sun-)light, which makes these materials very suitable for solar cells. Furthermore, it is crucial that this absorbed light is converted into a current of moving charges, also known as electricity. Semiconductor materials such as silicon or metal halide perovskites have the ideal properties to generate a current of charges from light. In order to use this current however, the charges need to be collected. The efficiency with which charges are collected in a solar cell is closely related to its power conversion efficiency.ChemE/Opto-electronic Material
Maasvlakte 2, vanuit historisch perspectief; "Variant met doorgetrokken Hartelkanaal voor zeescheepvaart"
No full textIn deel 2 van het afstudeerwerk is een ontwerp gemaakt voor de uitbreiding van de Rotterdamse haven op basis van twee ontwerpplannen voor havenuitbreiding uit de jaren '70.Hydraulic EngineeringCivil Engineering and Geoscience
Thermally Activated Second-Order Recombination Hints toward Indirect Recombination in Fully Inorganic CsPbI<sub>3</sub> Perovskites
No full textThe relationship between the dipole moment of the methylammonium cation and the optoelectronic properties of lead halide perovskites remains under debate. We show that both the temperature-dependent charge carrier mobility and recombination kinetics are identical for methylammonium and cesium lead iodide, indicating that the role of the monovalent cation is subordinate to the lead iodide framework. From the observation that for both perovskites the electron-hole recombination is thermally activated, we speculate that the bandgap is slightly indirect.ChemE/Opto-electronic Material
Maasvlakte 2, vanuit historisch perspectief: "van Botlek tot Maasvlakte 2"
No full textCivil Engineering and Geoscience
Shifting The Innovation Mindset: Embracing Nature’s Circular Economy In A Co-Creation Session
No full textSociety is facing a critical point of unsustainability, urging the need to accelerate the transition towards a circular economy (CE). This transition not only addresses pressing issues but also unlocks new business opportunities. However, the lack of clarity around its specifics leaves many businesses uncertain about how to best respond, navigate, and adapt to this change.The design and innovation agency IN10 is committed to contributing to this transition by bridging this gap. Specializing in digital design, they collaborate with clients to create positive, future-oriented, user-centered service solutions. As the company has recognized the value of co-creation sessions to drive transformations, it seeks to expand its service offerings to encompass the circular economy context. This graduation project revolves around their creative problem-solving approach. It aims to define the innovation mindset IN10 should embrace to design for the CE transformation and explores how this mindset can be applied in a co-creation session. Following a learning-by-doing approach involving exploration, analysis, and creation phases, the project delves into various innovation strategies, business barriers, and conceptual metaphors to develop a comprehensive understanding of the circular economy and the type of thinking required to achieve this. An examination reveals that the prevailing technocratic narrative of the circular economy overlooks vital aspects of the transition, making it too narrow to rely on exclusively. Therefore, this project proposes to adopt the Living Ecosystem Mindset, which conceptualizes the circular economy through the metaphor of a forest and addresses the limitations of the technocratic perspective. This holistic view embraces ecological and social values, draws inspiration from nature’s open-ended and flexible cycles, and integrates social sustainability considerations. Furthermore, it redefines the purpose of the circular economy beyond mere economic growth to prioritize meeting human needs. The CE transition demands systemic change, necessitating a systemic design approach. An analysis of IN10’s approach reveals shortcomings in this area. Consequently, the project compares two systemic design approaches to identify success factors that IN10 can adopt. Both internal and external insights inform the concept development phase. Ultimately, the project introduces the Circular Future Session as a theoretical foundation and starting point for IN10’s Circular Sprint Series. The session encompasses systemic design phases: creating a shared understanding, understanding the big picture, and envisioning a desirable future. It includes the following activities: Vision Talk, Actor Map, Wider Lens, and Circular Idea, aiming to generate circular ideas aligned with living ecosystem thinking. The concept underwent internal testing within IN10, but it is recommended to be refined further through client sessions. Besides, IN10 must continue investing in knowledge about the circular economy and living ecosystem thinking. This investment will enable them to execute future co-creation sessions effectively and navigate the other design steps related to the CE transformation.Strategic Product Desig
Strategies for Pre-Flood Risk Management - Case Studies and Recommendations
No full textThe report \u93Strategies for Pre-Flood Risk Management \u96 Case Studies and Recommendations\u94 proposes (1) a theoretical framework to analyse the content, process, and context of strategies for reducing flood risk within catchments. (2) Three case studies illustrate why researchers and practitioners alike can benefit from using the framework to better understand the process dimension of strategies for pre-flood risk management (which is, in this report, mainly long-term planning of combinations of structural and non-structural measures). (3) The report formulates six recommendations to practitioners how to improve flood risk management through shifting attention.Floodsit
Reconstructing occluded Elevation Information in Terrain Maps with Self-supervised Learning
No full textAccurate and complete terrain maps enhance the awareness of autonomous robots and enable safe and optimal path planning. Rocks and topography often create occlusions and lead to missing elevation information in the Digital Elevation Map (DEM). Currently, these occluded areas are either fully avoided during motion planning or the missing values in the elevation map are filled-in using traditional interpolation, diffusion or patch-matching techniques. These methods cannot leverage the high-level terrain characteristics and the geometric constraints of line of sight we humans use intuitively to predict occluded areas. We introduce a self-supervised learning approach capable of training on real-world data without a need for ground-truth information to reconstruct the occluded areas in the DEMs. We accomplish this by adding artificial occlusion to the incomplete elevation maps constructed on a real robot by performing ray casting. We first evaluate a supervised learning approach on synthetic data for which we have the full ground-truth available and subsequently move to several real-world datasets. These real-world datasets were recorded during exploration of both structured and unstructured terrain with a legged robot, and additionally in a planetary scenario on Lunar analogue terrain. We state a significant improvement compared to the baseline methods both on synthetic terrain and for the real-world datasets. Our neural network is able to run in real-time on both CPU and GPU with suitable sampling rates for autonomous ground robots. We motivate the applicability of reconstructing occlusion in elevation maps with preliminary motion planning experiments.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Learning & Autonomous Contro
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