110 research outputs found
Testing the evolutionary link between submillimetre galaxies and quasars: CO observations of QSOs at z~2
No full textWe have used the IRAM Plateau de Bure millimetre interferometer and the UKIRT 1–5 μm Imager Spectrometer (UIST) to test the connection between the major phases of spheroid growth and nuclear accretion by mapping CO emission in nine submillimetre-detected QSOs at z= 1.7–2.6 with black hole (BH) masses derived from near-infrared spectroscopy. When combined with one QSO obtained from the literature, we present sensitive CO(3–2) or CO(2–1) observations of 10 submillimetre-detected QSOs selected at the epoch of peak activity in both QSOs and submillimetre (submm) galaxies (SMGs). CO is detected in 5/6 very optically luminous (MB∼−28) submm-detected QSOs with BH masses MBH≃ 109–1010 M⊙, confirming the presence of large gas reservoirs of Mgas≃ 3.4 × 1010 M⊙. Our BH masses and dynamical mass constraints on the host spheroids suggest, at face value, that these optically luminous QSOs at z= 2 lie about an order of magnitude above the local BH–spheroid relation, MBH/Msph, although this result is dependent on the size and inclination of the CO-emitting region. However, we find that their BH masses are ∼30 times too large and their surface density is ∼300 times too small to be related to typical SMGs in an evolutionary sequence. Conversely, we measure weaker CO emission in four fainter (MB∼−25) submm-detected QSOs with properties, BH masses (MBH≃ 5 × 108 M⊙), and surface densities similar to SMGs. These QSOs appear to lie near the local MBH/Msph relation, making them plausible ‘transition objects’ in the proposed evolutionary sequence linking QSOs to the formation of massive young galaxies and BHs at high redshift. We show that SMGs have a higher incidence of bimodal CO line profiles than seen in our QSO sample, which we interpret as an effect of their relative inclinations, with the QSOs seen more face-on. Finally, we find that the gas masses of the four fainter submm-detected QSOs imply that their star formation episodes could be sustained for ∼10 Myr, and are consistent with representing a phase in the formation of massive galaxies which overlaps a preceding SMG starburst phase, before subsequently evolving into a population of present-day massive ellipticals
Du gaz et de la poussière dans les quasars à grand décalage spectral
No full textThis thesis presents the study of dust and gas in high redshift quasars (QSOs) based on (sub)millimeter and radio observations. The surveys of the infrared and radio continuum of optically luminous and radio-quiet QSOs at 1.96 QSOs. The relationship between infrared and radio emission sfolowed by local galaxies is also found for the high-z QSOs, suggesting that the dust heating is dominated by young massive stars. These studies have allowed us to derive a relationship between the black hole and star formation activity. The high star formation rates (~1000Mo/yr) point to intense starbursts which have to be sustained by massive reservoirs of molecular gas. The detection of CO in J1409+5628 at z=2.56 in described in detail and a global study of the CO emission in high-z sources is presented. In a few cases, the detection of several CO transitions enables to constrain the physical conditions, indicating gas temperatures of 60-100K, and densities of 103-4cm-3, comparable to what is found in M82 and Arp220. Finally, the detection of CI and HCN is reported in two high-z QSOs.These studies have allowed us to constrain the physical conditions in the host galaxies of high-z QSOs, among the most massive objects in the universe. These exploratory studies, which open the way to the study of the interstellar medium in the extreme environments of the first galaxies, will come to full maturity when the satellite Herschel and the interferometers eVLA and ALMA will be operational.Cette thèse est consacre à l'étude de la poussière et du gaz dans les quasars (QSO) grand décalage spectral à l'aide d'observations (sub)millimétrique et radio.Les relevés dans le continuum infrarouge et radio de QSO optiquement lumineux et radio faibles 1.96. La relation entre l'émission infrarouge et radio des galaxies locales est vérifiée pour les QSO grand z, indiquant que le chauffage dominant provient des étoiles massives nouvellement formées. Ces études ont mis en évidence une relation entre les activités du trou noir et de la formation stellaire. Les taux de formation stellaire très élevés (~1000Mo/yr) indiquent d'intenses flambées stellaires nécessitant dimportants réservoirs de gaz moléculaire.La détection de CO dans J1409+5628 z=2.56 est décrit en détail et une étude globale du gaz moléculaire des sources grand z est présentée. Dans quelques cas, la détection de plusieurs transitions de CO permet de contraindre les conditions physiques indiquant des températures de 60-100K, et des densités de 10^(3-4) cm-3, comparables M82 ou Arp220. Enfin, la détection de CI et de HCN est rapporte pour deux QSO grand z.Ces travaux ont permis de contraindre les conditions physiques dans les galaxies hôtes de QSO à grand z, parmi les objets les plus massifs formés dans l'Univers. Ces programmes exploratoires, qui ouvrent la voie l'étude du milieu interstellaire dans l'environnement extrème des premières galaxies, connaîtront leur plein essor avec la mise en opération du satellite Herschel et des interféromètres eVLA et ALMA
Correction to: Idelalisib treatment prior to allogeneic stem cell transplantation for patients with chronic lymphocytic leukemia: a report from the EBMT chronic malignancies working party (Bone Marrow Transplantation, (2021), 56, 3, (605-613), 10.1038/s41409-020-01069-w)
No full textThe Idelalisib treatment prior to allogeneic stem cell transplantation for patients with chronic lymphocytic leukemia: a report from the EBMT chronic malignancies working party, written by Johannes Schetelig, Patrice Chevallier, Michel van Gelder, Jennifer Hoek, Olivier Hermine, Ronjon Chakraverty, Paul Browne, Noel Milpied, Michele Malagola, Gerard Socié, Julio Delgado, Eric Deconinck, Ghandi Damaj, Sebastian Maury, Dietrich Beelen, Stéphanie Nguyen Quoc, Paneesha Shankara, Arne Brecht, Jiri Mayer, Mathilde Hunault-Berger, Jörg Bittenbring, Catherine Thieblemont, Stéphane Lepretre, Henning Baldauf, Liesbeth C. de Wreede, Olivier Tournilhac, Ibrahim Yakoub-Agha, Nicolaus Kröger, Peter Dreger was originally published Online First without Open Access. After publication in volume 56, issue 3, page 605–613 the author decided to opt for Open Choice and to make the article an Open Access publication. Therefore, the copyright of the article has been changed to © The Author(s) 2020 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/ licenses/by/4.0. Open access funding enabled and organized by Projekt DEAL
Fluorverwijdering in het schone fosforzuurproces
No full textDocument uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
Adaptive Observer for Automated Emergency Maneuvers: Fusing cost-efficient onboard sensors with computer vision into a robust estimate of sideslip angle using online covariance calculation
No full textOne of the most promising ideas in autonomous vehicle control systems is letting the vehicle drive autonomously outside the normal, linear, operating region and letting it "drift". By doing so, the maneuverability of the vehicle could be enhanced. To enable systems that can control this behaviour, estimation of certain vehicle states is needed with high accuracy and high frequency.In this project, a new solution to this problem is proposed by combining a mixed dynamic-kinematic observer with a single camera that produces velocity measurements based on tracking the ground plane. To improve filtering of the camera velocity measurements, the measurement error covariance matrix is updated online based on a model of the camera measurement error. Evaluation of the new methodology was done on data recorded from a 1:10 scale test vehicle and performance was assessed based on ground truth data obtained using a Motion Capture System.In normal driving conditions with correctly identified vehicle parameters, an observer without camera performs better by 25% in terms of RMSE on lateral velocity and sideslip angle estimation. However, the online adaptation of the covariance matrix results in an estimate that is at least 45% more accurate in terms of RMSE than the same observer without online covariance adaptation. Next to that, experiments show that the proposed observer with camera has better robustness to uncertainty in model parameters by almost a factor five in terms of RMSE than the observer without camera.When the grip of the tires is physically lowered and the vehicle is drifting, the proposed observer can track large sideslip angles (>30°), where the state-of-the-art observer without camera is not able. The state-of-the-art observer has an increase in RMSE of 75% on all estimated quantities in comparison to the proposed methodology. These results show that adding a camera to an existing sideslip angle observer greatly enhances robustness of the observer to uncertainty in model parameters and violation of model assumptions. This comes dat the cost of losing some accuracy in normal driving conditions.Mechanical Engineering | Systems and Contro
Megefficientie van statische mengers voor verdunde polyacrylamide oplossingen in turbulente stroming
No full textKramers Laboratorium voor Fysische TechnologieApplied Science
A concrete school
No full textIn The Netherlands concrete as a building material doesn’t have a positive image. This is partly because of the fact that vocational education in concrete has disappeared from Holland. There is therefore little craftsmanship in concrete available. By building a vocational school for concrete, an institute for the making of concrete, craftsmanship in concrete can be brought into the Dutch building industry. Hopefully guaranteeing aesthetic concrete a fruitful future in The Netherlands. By designing a public school in the city centre of Breda, the craftsmanship that is taught to the students becomes visible to the passer-by. Some of the machine- and workshop rooms are located directly next to the street and connected with this street by a public colonnade. People walking through the busy city centre will in this way be confronted with a world of concrete that is unknown for them. Concrete can be divided in two types, depending on the way it is made, namely in-situ and precast concrete. In this design both types of concrete are used. The two entrances, with organic stairways, to both buildings are indicated by the use of in-situ concrete. This is where the student and visitor enter the building and directly feel the presence of the demolished formwork. The concrete shows the relics of its making process and with this evokes a curiosity about the material. To give way to making these big and expensive in-situ parts of the building, the rest of the building is designed in less expensive factory made precast sandwich elements, partly with a terrazzo finish. These elements consist of a load-bearing inner leaf, an insulation layer and an concrete/terrazzo outer leaf. Taking into account many practical and technical issues, like maximum transport measures and weight, a system of elements is designed. Because part of the reason to build this school is to enhance the image of concrete, some parts of the outer leaf are polished. These parts show the different types of natural stone used inside of the concrete, and give the building a shiny and exclusive appearance. Exactly the appearance that doesn’t come into mind when one thinks of concrete.Architecture and The Built EnvironmentArchitectur
Hoe God aanwezig is in het werk van Maarten ’t Hart
No full textMaarten ’t Hart is widely regarded as the prototypical Dutch author who has left his Orthodox Reformed background behind. Yet religion is present throughout his work. In her dissertation Religion im Werk von Maarten ’t Hart (2022), German theologian Christina Bickel describes the playful manners in which ’t Hart deals with religion as an inspiring way to open the mind of modern man to transcedental reflections. Her interdisciplinary approach combining literary analysis, theological hermeneutics and homiletics, offers a surprising example of the reception of a Dutch author within a foreign cultural context.Maarten ’t Hart is widely regarded as the prototypical Dutch author who has left his Orthodox Reformed background behind. Yet religion is present throughout his work. In her dissertation Religion im Werk von Maarten ’t Hart (2022), German theologian Christina Bickel describes the playful manners in which ’t Hart deals with religion as an inspiring way to open the mind of modern man to transcedental reflections. Her interdisciplinary approach combining literary analysis, theological hermeneutics and homiletics, offers a surprising example of the reception of a Dutch author within a foreign cultural context.Maarten ’t Hart is widely regarded as the prototypical Dutch author who has left his Orthodox Reformed background behind. Yet religion is present throughout his work. In her dissertation Religion im Werk von Maarten ’t Hart (2022), German theologian Christina Bickel describes the playful manners in which ’t Hart deals with religion as an inspiring way to open the mind of modern man to transcedental reflections. Her interdisciplinary approach combining literary analysis, theological hermeneutics and homiletics, offers a surprising example of the reception of a Dutch author within a foreign cultural context
Communiceren in het bouwproces wanneer BIM wordt toegepast
No full textOp basis van de DNR zou het communicatieproces in de design- en engineeringfase sturing krijgen. Dit blijkt echter niet het geval; projectleiders geven zelf richting aan het communicatieproces. Dit proces bestaat uit verschillende stappen die doorlopen worden om alle informatie definitief te krijgen. In elke stap vindt communicatie plaats. In dit onderzoek is gekeken naar drie aspecten, namelijk: drijvers, BIM in het communicatieproces en de knelpunten die kunnen ontstaan in het communicatieproces. Deze aspecten worden hier dan kort besproken. Het communicatieproces wordt beïnvloed door drijvers (contractafspraken, inkoopafspraken, fasering en fysieke samenstelling van het team). Deze drijvers hebben invloed op verschillende stappen in het proces. In het communicatieproces wordt BIM gebruikt bij een aantal stappen. Vanaf het moment dat informatie gegenereerd wordt is BIM ingezet bij de verschillende cases. Tot het moment dat oplossingen gezocht moeten worden, vonden de stappen plaats met gebruik van BIM. In het communicatieproces kunnen knelpunten ontstaan. Deze knelpunten kunnen om vier verschillende redenen ontstaan: werd over de juiste inhoud gesproken (“wat”), vindt de communicatie plaats tussen de juiste personen( “wie”), vond de stap plaats op het juiste moment (“wanneer”) en werd het juiste middel gebruikt (“hoe”)? In drie stappen zijn frequenter dezelfde knelpunten voorgekomen. Dit is (1) bij het afstemmen van randvoorwaarden, (2) het coördineren van informatie en (3) het oplossen van problemen en het zoeken van een verantwoordelijke. Niet in alle stappen ontstaan echter knelpunten voor alle vier de redenen, “wie”, “wat”, “wanneer” en “hoe”. Dit is alleen het geval bij het coördineren van informatie. Dit komt onder andere door het gebruik van BIM. Naast de knelpunten in de specifieke stappen ontstonden er ook knelpunten gedurende het gehele proces. Veel van de knelpunten gaan iteraties tegen. De iteraties die mogelijk zijn in het communicatieproces zijn nodig voor het ontwerpproces. Wanneer deze worden tegengehouden zullen problemen niet, of te laat naar voren komen. Knelpunten kunnen niet alleen iteraties tegenhouden, maar zij kunnen ook onnodige iteraties veroorzaken. Door verkeerde communicatie kunnen onnodige iteraties ontstaan. Concluderend is in dit onderzoek het communicatieproces in kaart gebracht en vormgegeven, is het proces geanalyseerd op knelpunten en is de rol van BIM in dit proces aan de orde gekomen. De knelpunten in het communicatieproces bieden kansen voor optimalisatie in de toekomst.Design for construction managementReal Estate & HousingArchitectur
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