223 research outputs found
Testing Koopmans spectral functionals on the analytically solvable Hooke's atom
No full textKoopmans spectral functionals are a class of orbital-density-dependent functionals designed to accurately predict spectroscopic properties. They do so markedly better than their Kohn-Sham density-functional theory counterparts, as demonstrated in earlier works on benchmarks of molecules and bulk systems. This work is a complementary study where-instead of comparing against real, many-electron systems-we test Koopmans spectral functionals on Hooke's atom, a toy two-electron system that has analytical solutions for particular strengths of its harmonic confining potential. As these calculations clearly illustrate, Koopmans spectral functionals do an excellent job of describing Hooke's atom across a range of confining potential strengths. This work also provides broader insights into the features and capabilities of Koopmans spectral functionals more generally. (c) 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).THEO
Horizontal integration in markets for complementary components and vertical product differentiation: A case-based analysis in the semiconductor industry
No full textObservations of recent mergers and acquisitions (M&A) in the semiconductor and computer industry indicate that activities concentrate on the technology leaders in this market. The author examines the influence of players’ heterogeneous product technologies on their involvement in M&A. He provides a rationale for the influence with the help of a case study and a two-stage non cooperative game. The case is about an acquisition wave between suppliers in two semiconductor component markets. Exemplary for the whole industry, acquisition activities concentrated on the technology leader in one of the component markets. Technological heterogeneity is represented within a vertically differentiated product space in the model
Data Analytics for Grid Resilience with Early Failures and Wear-out Failures
No full textThe here reported work is part of a project on supporting grid resilience by asset management techniques. The present work focuses on support of decision-making after a few failures occurred that may be the start of many more. Methods are reviewed and new algorithms developed where the present IEEE/IEC standard does not provide. Two cases of early failures and wear-out are analyzed as examples for the data analytics. 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.DC systems, Energy conversion & Storag
Weighted Linear Regression based Data Analytics for Decision Making after Early Failures
No full textThis paper discusses a method for data analysis of early failures that are typically due to defects from production and/or installation. The approach is based on Weighted Linear Regression and aims at estimating the next failure moment and the failure probability in an interval. As an additional goal, methods are intended to be suitable for light computing devices.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.High Voltage Technology GroupDC systems, Energy conversion & Storag
Corrigendum to ‘An urban climate assessment and management tool for combined heat and air quality judgements at neighbourhood scale’
No full textThe authors regret that erroneously Sytse Koopmans MSc, was not listed as co-author in the original paper. Sytse Koopmans has introduced the LCZ-control in Figure 1, and performed the WRF runs presented in Fig 3. These model runs are also the basis for the analysis of Fig. 5 and the further development of the urban climate assessment and management tool. Therefore we would like to add him as co-author to this paper. The authors would like to apologise for any inconvenience caused
Op zoek naar een nieuw ruraal ideaal
No full textDe titel ‘Op zoek naar een nieuw ruraal ideaal’ staat voor een strategie met als doel een zelfstandige en duurzame dorpsgemeenschap te scheppen bestaande uit oorspronkelijke bewoners en nieuwkomers. De strategie is toegespitst op het aansporen en betrekken van de lokale bevolking en omvat drie elementen; een reizende kermis als initiator, een ambitiekaart als communicatiemiddel en multifunctionele gebouwen als instrumenten.Explore labArchitectureArchitectur
PAS leert ons dat we strijdige belangen niet kunnen ‘wegpolderen’
No full textTien jaar geleden besloot de Tweede Kamer dat de stikstofuitstoot mocht stijgen als gelijktijdig natuurmaatregelen werden getroffen die later tot minder uitstoot zouden leiden. Diederik Samsom en Ger Koopmans hadden hiertoe een amendement ingediend. Met deze theoretische beleidswerkelijkheid namen ze onbedoeld een hypotheek op de toekomst, betoogt hoogleraar Gebiedsontwikkeling Co Verdaas. Als onderliggende belangen en waarden worden ‘weggepolderd’, betekent dit nog niet dat de strijd gestreden is. De keuzes waar ‘we’ voor staan, moeten alsnog gemaakt worden.Practice Chair Urban Area Developmen
Emerg Infect Dis
No full textViral pathogens are the most common causes of gastroenteritis in the community. To identify modes of transmission and opportunities for prevention, a case-control study was conducted and risk factors for gastroenteritis attributable to norovirus (NV), Sapporo-like virus (SLV), and rotavirus were studied. For NV gastroenteritis, having a household member with gastroenteritis, contact with a person with gastroenteritis outside the household, and poor food-handling hygiene were associated with illness (population attributable risk fractions [PAR] of 17%, 56%, and 47%, respectively). For SLV gastroenteritis, contact with a person with gastroenteritis outside the household was associated with a higher risk (PAR 60%). For rotavirus gastroenteritis, contact with a person with gastroenteritis outside the household and food-handling hygiene were associated with a higher risk (PAR 86% and 46%, respectively). Transmission of these viral pathogens occurs primarily from person to person. However, for NV gastroenteritis, foodborne transmission seems to play an important role
De leefomgeving in maatschappelijke kosten-batenanalyses van transportprojecten
No full textEen analyse van 54 Nederlandse maatschappelijke kostenbatenanalyses (MKBA’s) van transportprojecten uit de periode 2000 tot 2011 laat zien dat het meenemen van de leefomgevingseffecten verbeterd kan worden. De criteria van ‘good practice’ voor het meenemen van leefomgevingseffecten zijn afgeleid van debatten in de wetenschappelijke literatuur. De 54 MKBA’s blijken behoorlijk compleet in het meenemen van leefomgevingseffecten van transportprojecten maar de MKBA-praktijk worstelt met het hangen van een prijskaartje aan leefomgevingseffecten en met een heldere presentatie van de effecten. Consequenties van wetenschappelijke debatten over de grote onzekerheden in de methoden om leefomgevingseffecten uit te drukken in een prijs en over disconteren in relatie tot het concept van duurzaamheid, worden nauwelijks teruggevonden in de huidige MKBApraktijk. Aanbevelingen worden gedaan om de praktijk te verbeteren.Infrastructures, Systems and ServicesTechnology, Policy and Managemen
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