20 research outputs found
EDI: Kansspel, machtsspel of samenspel? Een onderzoek naar de invloed van omgevings- en groepsfactoren op het verloop en het resultaat van EDI-ontwikkelingsprojecten
No full textTechnology, Policy and Managemen
Bedrijventerreinen over de groene grens
No full textDit onderzoek is uitgevoerd in opdracht van Stichting Natuur en Milieu.OTB Research Institute for the Built Environmen
Een verslag van een onderzoek naar enkele aspecten van de programmeertaal CHILL, en naar de implementatie ervan in de DNL CHILL-compiler
No full textDit verslag is een beschrijving van een onderzoek naar enkele aspecten van de CCITT High Level Language CHILL. Aangegeven wordt hoe een raamwerk kan worden opgebouwd ten behoeve van de in CHILL beschreven telefonieprocessen. De prettige eigenschappen en tekortkomingen van CHILL worden in dat verband toegelicht. Ook aan ergonomische aspecten van CHILL constructies wordt aandacht besteed, alsmede aan die van de op het Dr. Neher Laboratorium ontwikkelde CHILL-compiler. Er wordt een volledig uitgewerkt voorstel gedaan voor de implementatie van faciliteiten voor "concurrent processing", ten behoeve van het "run-time support" van de DNL CHILL-compiler.Electrical Engineering, Mathematics and Computer ScienceVakgroep Automatische Verkeerssysteme
Progressive hyperthermia elicits distinct responses in maximum and rapid torque production
Get PDFObjectivesTo investigate the effect of progressive whole-body hyperthermia on maximal, and rapid voluntary torque production, and their neuromuscular determinants.DesignRepeated measures, randomised.MethodsNine participants performed sets of neuromuscular assessments in HOT conditions (~50°C, ~35% relative humidity) at rectal temperatures (Tre) of 37, 38.5 and 39.5°C and in CON conditions (~22°C, ~5% relative humidity) at a Tre of ~37°C and pre-determined comparative time-points. Electrically evoked twitch (single impulse) and octet (8 impulses at 300 Hz) responses were measured at rest. Maximum voluntary torque (MVT), surface electromyography (EMG) normalised to maximal M-wave, and voluntary activation (VA) were measured during 3-5 s isometric maximal voluntary contractions. Rate of torque development (RTD) and normalised EMG were measured during rapid voluntary isometric contractions from rest.ResultsAll neuromuscular variables were unaffected by time in CON. In HOT, MVT, normalised EMG at MVT and VA were lower at 39.5°C compared to 37°C (p<0.05). Early- (0-50 ms) and middle- (50-100 ms) phase voluntary RTD were unaffected by increased Tre (p>0.05), despite lower normalised EMG at Tre 39.5°C (p<0.05) in rapid contractions. In contrast, late-phase (100-150 ms) voluntary RTD was lower at 38.5°C and 39.5°C compared to 37°C (p<0.05) in HOT. Evoked twitch and octet RTD increased with increased Tre (p<0.05). ConclusionsHyperthermia reduced late-phase voluntary RTD, likely due to reduced neural drive and the reduction in MVT. In contrast, early- and middle-phase voluntary RTD were unaffected by hyperthermia, likely due to the conflicting effects of reduced neural drive but faster intrinsic contractile properties.© 2021, Sports Medicine Australia. Published by Elsevier Ltd. The attached document (embargoed until 19/03/2023) is an author produced version of a paper published in JOURNAL OF SCIENCE AND MEDICINE IN SPORT uploaded in accordance with the publisher’s self-archiving policy. The final published version (version of record) is available online at the link. Some minor differences between this version and the final published version may remain. We suggest you refer to the final published version should you wish to cite from it.</p
Schema cementfabriek (nat procédé)
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
A novel pressure-free two-fluid model for one-dimensional incompressible multiphase flow
Get PDFA novel pressure-free two-fluid model formulation is proposed for the simulation of one-dimensional incompressible multiphase flow in pipelines and channels. The model is obtained by simultaneously eliminating the volume constraint and the pressure from the widely used two-fluid model (TFM). The resulting ‘pressure-free two-fluid model’ (PF-TFM) has a number of attractive features: (i) it features four evolution equations (without additional constraints) that can be solved very quickly with explicit time integration methods; (ii) it keeps the conservation properties of the original two-fluid model, and therefore the correct shock relations in case of discontinuities; (iii) its solutions satisfy the two TFM constraints exactly: the volume constraint and the volumetric flow constraint; (iv) it offers a convenient form to analytically analyse the equation system, since the constraint has been removed. A staggered-grid spatial discretization and an explicit Runge-Kutta time integration method are proposed, which keep the constraints exactly satisfied when numerically solving the PF-TFM. Furthermore, for the case of strongly imposed boundary conditions, a novel adapted Runge-Kutta formulation is proposed that keeps the volumetric flow exact in time while retaining high order accuracy. Several test cases confirm the theoretical properties and show the efficiency of the new pressure-free model
The El Palmar Area: A study on hydrodynamic and sedimentation characteristics
No full textThe purpose of this study is to identify the hydrodynamic effects of the dredging works and stationary making of the El Palmar island in 2015. The most critical parameters include wet/drys season, sediment characteristics and tides. This study makes use of a model constructed in DELFT3D. The model is used to show both the hydrodynamic and sedimentation characteristics for several scenario’s. The results from this study can be used as information source for future dredging works and flooding prevention in the area of Guayaquil.Civil Engineering and GeosciencesMultidisciplinary Project (CIE4061-09
Stedelijke bevolking en voorzieningen. Enkele onderzoeksaspecten en richtlijnen voor ontwerp en planning betreffende gezondheidszorgvoorzieningen en winkelvoorzieningen
No full textDe Netherlands Graduate School of Housing and Urban Research (Nethur) organiseert in het kader van haar onderwijsprogramma voor assistenten-inopleiding eenmaal per twee jaar een cursus stedelijk onderzoek. Hierin worden actuele ontwikkelingen in de theorie en methodiek van het vakgebied door deskundigen belicht en met de deelnemers bediscussieerd. In 1992 berustte de organisatie voor het onderdeel stedelijke bevolking en voorzieningen bij het Onderzoeksinstituut voor Stedebouw, Planologie en Architectuur (OSPA), faculteit Bouwkunde, Technische Universiteit Delft. Voor dit onderdeel viel de keus op twee categorieën voorzieningen die sterk in de belangstelling staan, t.W. voorzieningen in de gezondheidszorg en winkelvoorzieningen. Vanuit de Delftse optiek viel de nadruk hierbij op de consequenties van recente ontwikkelingen voor ontwerp en planning van deze voorzieningen . Mede gezien de actualiteitswaarde is besloten over te gaan tot publikatie van de op de cursusdag (30 oktober 1992) gehouden referaten .Onderzoeksinstituut voor Stedebouw, Planologie en Architectuur (OSPA)Architectur
Candidatus Ancillula trichonymphae', a novel lineage of endosymbiotic Actinobacteria in termite gut flagellates of the genus Trichonympha
No full textTermite gut flagellates are colonized by host-specific lineages of ectosymbiotic and endosymbiotic bacteria. Previous studies have shown that flagellates of the genus Trichonympha may harbour more than one type of symbiont. Using a comprehensive approach that combined cloning of SSU rRNA genes with fluorescence in situ hybridization and electron microscopy, we investigated the phylogeny and subcellular locations of the symbionts in a variety of Trichonympha species from different termites. The flagellates in Trichonympha Cluster I were the only species associated with ‘Endomicrobia’, which were located in the posterior part of the cell, confirming previous results. Trichonympha species of Cluster II from the termite genus Incisitermes (family Kalotermitidae) lacked ‘Endomicrobia’ and were associated with endosymbiotic Actinobacteria, which is highly unusual. The endosymbionts, for which we suggest the name ‘Candidatus Ancillula trichonymphae’, represent a novel, deep-branching lineage in the Micrococcineae that consists exclusively of clones from termite guts. They preferentially colonized the anterior part of the flagellate host and were highly abundant in all species of Trichonympha Cluster II except Trichonympha globulosa. Here, they were outnumbered by a Desulfovibrio species associated with the cytoplasmic lamellae at the anterior cell pole. Such symbionts are present in both Trichonympha clusters, but not in all species. Unlike the intracellular location reported for the Desulfovibrio symbionts of Trichonympha agilis (Cluster I), the Desulfovibrio symbionts of T. globulosa (Cluster II) were situated in deep invaginations of the plasma membrane that were clearly connected to the exterior of the host cell
