Katalytische oxidatie van SO2 in rookgas

Document(en) uit de collectie Chemische Procestechnologie.DelftChemTechApplied Science

Policy analysis of water management for the Netherlands. Vol XII: Model for regional hydrology, agricultural water demands and damages from droughts and salinity

This report describes a verification simulation of a model of the Eastern Scheldt. Boundary conditions for a simulation of flows and water levels on 11 January 1982 are obtained from gauging stations in the offshore area of the estuary by use of weighting functions obtained from simulations with other models of conditions of September 1975 in the offshore area. The simulation was made first without taking into account the effects of the varying density in the estuary. By operating the model in this mode a direct comparison with a hydraulic model could be made. In the verification simulation, pressures resulting from salinity differences were included in the comparison. An average salinity distribution was an input at the start of the simulation. Simulation results indicated a very good agreement between observed and computed transport rates through the Hammen, Schaar, and Roompot. A good agreement between observed and computed water levels was also obtained. The simulation in which the pressures resulting from salinity were included had a better agreement with observed data than the simulation without the salinity.PAW

SBW piping: Projectplan 2009 (TO)

Projectplan 2009 met vooruitkijk 2010. Het projectplan is onder te verdelen in twee blokken: \u95 Hervalidatie piping \u95 Onder- en achterloopsheid bij kunstwerken In voorliggend projectplan wordt aangegeven hoe aan de doelstellingen in het kader van Toegepast Onderzoek (TO) invulling zal worden gegeven. Er worden de werkzaamheden omschreven die in 2009 binnen TO zullen worden uitgevoerd. Daarbij is de omvang van de werkzaamheden begroot, is het geheel in een planning vervat en worden de producten inclusief opleverdatum genoemd.SB

Capelin: Data-Driven Compute Capacity Procurement for Cloud Datacenters using Portfolios of Scenarios

Cloud datacenters provide a backbone to our digital society. Inaccurate capacity procurement for cloud datacenters can lead to significant performance degradation, denser targets for failure, and unsustainable energy consumption. Although this activity is core to improving cloud infrastructure, relatively few comprehensive approaches and support tools exist for mid-tier operators, leaving many planners with merely rule-of-thumb judgement. We derive requirements from a unique survey of experts in charge of diverse datacenters in several countries. We propose Capelin, a data-driven, scenario-based capacity planning system for mid-tier cloud datacenters. Capelin introduces the notion of portfolios of scenarios, which it leverages in its probing for alternative capacity-plans. At the core of the system, a trace-based, discrete-event simulator enables the exploration of different possible topologies, with support for scaling the volume, variety, and velocity of resources, and for horizontal (scale-out) and vertical (scale-up) scaling. Capelin compares alternative topologies and for each gives detailed quantitative operational information, which could facilitate human decisions of capacity planning. We implement and open-source Capelin, and show through comprehensive trace-based experiments it can aid practitioners. The results give evidence that reasonable choices can be worse by a factor of 1.5-2.0 than the best, in terms of performance degradation or energy consumption.Accepted author manuscriptAlgorithmicsDistributed System

The Investigation of Archaeological Glass Using X-Ray Fluorescence Spectroscopy and X-Ray Micro Computed Tomography

X-ray fluorescence spectroscopy (XRF) and X-ray micro computed tomography (μ-CT) were applied to the study of four archaeological glass objects from the collection of the Allard Pierson in Amsterdam, The Netherlands. Often, little is known about the provenience and provenance of archaeological glass objects, as documentation is regularly insufficient to assign a specific place and date of excavation or place of production. This paper demonstrates the value of μ-CT for visualising the internal structures of archaeological glass objects, providing insight into production techniques and condition. The XRF results presented are consistent with published glass compositions but are, as yet, insufficient to assign the glass objects to a specific place of production. Part of a broader research project to apply non-destructive techniques to the study of archaeological glass objects, the results presented here will be the basis for the future evaluation of less commonly applied methods, such as neutron tomography and gamma spectroscopy.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.RST/Neutron and Positron Methods in MaterialsGeo-engineerin

Advancing catchment hydrology to deal with predictions under change

Throughout its historical development, hydrology as an earth science, but especially as a problem-centred engineering discipline has largely relied (quite successfully) on the assumption of stationarity. This includes assuming time invariance of boundary conditions such as climate, system configurations such as land use, topography and morphology, and dynamics such as flow regimes and flood recurrence at different spatio-temporal aggregation scales. The justification for this assumption was often that when compared with the temporal, spatial, or topical extent of the questions posed to hydrology, such conditions could indeed be considered stationary, and therefore the neglect of certain long-term non-stationarities or feedback effects (even if they were known) would not introduce a large error.Water ManagementCivil Engineering and Geoscience

Post-anaesthesia pulmonary complications after use of muscle relaxants (POPULAR): a multicentre, prospective observational study

Background Results from retrospective studies suggest that use of neuromuscular blocking agents during general anaesthesia might be linked to postoperative pulmonary complications. We therefore aimed to assess whether the use of neuromuscular blocking agents is associated with postoperative pulmonary complications.Methods We did a multicentre, prospective observational cohort study. Patients were recruited from 211 hospitals in 28 European countries. We included patients (aged >= 18 years) who received general anaesthesia for any in-hospital procedure except cardiac surgery. Patient characteristics, surgical and anaesthetic details, and chart review at discharge were prospectively collected over 2 weeks. Additionally, each patient underwent postoperative physical examination within 3 days of surgery to check for adverse pulmonary events. The study outcome was the incidence of postoperative pulmonary complications from the end of surgery up to postoperative day 28. Logistic regression analyses were adjusted for surgical factors and patients' preoperative physical status, providing adjusted odds ratios (ORadj) and adjusted absolute risk reduction (ARR(adj)). This study is registered with ClinicalTrials. gov, number NCT01865513.Findings Between June 16, 2014, and April 29, 2015, data from 22 803 patients were collected. The use of neuromuscular blocking agents was associated with an increased incidence of postoperative pulmonary complications in patients who had undergone general anaesthesia (1658 [7.6%] of 21 694); ORadj 1.86, 95% CI 1.53-2.26; ARR(adj) -4.4%, 95% CI -5.5 to -3.2). Only 2.3% of high-risk surgical patients and those with adverse respiratory profiles were anaesthetised without neuromuscular blocking agents. The use of neuromuscular monitoring (ORadj 1.31, 95% CI 1.15-1.49; ARR(adj) -2.6%, 95% CI -3.9 to -1.4) and the administration of reversal agents (1.23, 1.07-1.41; -1.9%, -3.2 to -0.7) were not associated with a decreased risk of postoperative pulmonary complications. Neither the choice of sugammadex instead of neostigmine for reversal (ORadj 1.03, 95% CI 0.85-1 center dot 25; ARR(adj) -0.3%, 95% CI -2.4 to 1.5) nor extubation at a train-of-four ratio of 0.9 or more (1.03, 0.82-1.31; -0.4%, -3.5 to 2.2) was associated with better pulmonary outcomes.Interpretation We showed that the use of neuromuscular blocking drugs in general anaesthesia is associated with an increased risk of postoperative pulmonary complications. Anaesthetists must balance the potential benefits of neuromuscular blockade against the increased risk of postoperative pulmonary complications