468 research outputs found
sj-docx-1-wmr-10.1177_0734242X231154140 – Supplemental material for Stakeholder perceptions on implementing design for disassembly and standardisation for heterogeneous construction components
No full textSupplemental material, sj-docx-1-wmr-10.1177_0734242X231154140 for Stakeholder perceptions on implementing design for disassembly and standardisation for heterogeneous construction components by Kostas Anastasiades, Joos Dockx, Marc van den Berg, Mario Rinke, Johan Blom and Amaryllis Audenaert in Waste Management & Research</p
Comparison between the SIMS and MEIS techniques for the characterization of ultra shallow arsenic implants
No full textSIMS and medium energy ion scattering (MEIS) have been applied to the characterization of ultra shallow distribution of arsenic in silicon obtained by ion implantation at 1 and 3 keV and successive annealing at low temperature (lower than 700 °C). In case of heavy elements in light matrices, the MEIS ultimate depth resolution and its ability to obtain quantitative results from first principles result in a good reference for SIMS depth profiling. The comparison of the results obtained by the two techniques allows to discriminate among different SIMS quantification processes in order to individuate the best in terms of accuracy in the initial transient width and at the SiO2–silicon interface: the simple normalization of 28Si75As- curve to the average of 28Si2- results in the best agreement between SIMS and MEIS in the surface region. Moreover SIMS profile of the 3 keV as implanted sample resulted 1.9 nm shallower than correspondent MEIS profiles whereas samples annealed at either 650 °C or 700 °C for 10 s show a good alignment of the As segregation peak at the SiO2/Si interface. The sample annealed at 550 °C for 200 s shows a reduced shift between SIMS and MEIS measured As peak: a possible effect of the residual amorphous layer on the sputtering rate is pointed out as responsible of these different shifts
Supplementary_Material_2_TREO_registry_experience_09_Apr_2019 – Supplemental material for Research methodology and practical issues relating to the conduct of a medical device registry
No full textSupplemental material, Supplementary_Material_2_TREO_registry_experience_09_Apr_2019 for Research methodology and practical issues relating to the conduct of a medical device registry by Theodosios Bisdas, Patrick Bohan, Mario Lescan, Clark J Zeebregts, Jörg Tessarek, Joost van Herwaarden, Jos C van den Berg, Carlo Setacci and Vincent Riambau in Clinical Trials</p
Supplementary_Material_1_IMDRF – Supplemental material for Research methodology and practical issues relating to the conduct of a medical device registry
No full textSupplemental material, Supplementary_Material_1_IMDRF for Research methodology and practical issues relating to the conduct of a medical device registry by Theodosios Bisdas, Patrick Bohan, Mario Lescan, Clark J Zeebregts, Jörg Tessarek, Joost van Herwaarden, Jos C van den Berg, Carlo Setacci and Vincent Riambau in Clinical Trials</p
TiN/STO/TiN MIMcaps nanolayers on silicon characterized by SIMS and AFM
No full textHigh-k dielectrics as SrxTi1-xOy (STO) are of great interest for the development of dynamic random access memory (DRAM) devices. The characterization of these nanolayers is important. SIMS depth profiling through TiN and STO films is affected by strong artifacts in different ways. The erosion process causes surface topography modifications both in the TiN/STO/TiN layer system and in the silicon substrate. AFM analyses have been carried out on pristine TiN and STO film surfaces and at various crater depths. Very different roughness evolutions are identified for TiN or STO films, within the SIMS craters sputtered with 500 eV Cs+ while using eucentric stage rotation
Stability of randomly placed log bed protections
No full textDesign criteria for the stability of rock filters on river beds (i.e. rock bed protection) are extensively researched and successfully applied in practice. The most common stability criteria are the Izbash and Shields criteria. These methods define a critical flow (Izbash) or parameter (Shields). Rijkswaterstaat (RWS) wants to explore a more sustainable bed protection by using logs. A pilot project is started where logs will be used as bed protection. It is yet unclear if the design and construction approaches for rock bed protections can be used for log bed protections. The most dominant aspect is that logs are cylindrical objects, while rocks are spherical. This means that the design criteria for rock filters might not be directly applicable to log filters. This research aims to verify if the Izbash and Shields criteria for rock can be used for logs to create functional and safe designs. To achieve this, two experiments are performed at the TU Delft faculty of Civil Engineering & Geosciences. The first experiment, done in a water filled tank, explores the settling behaviour of logs for multiple drop methods. Insight is gained in the settling velocities, horizontal spread and magnus effect (force exerted on a rotating object, e.g. the curve of a football spinning through the air) of logs settling in a water column. Results from these experiments are used in the second experiment. This experiment is done in a 14.3m long flow flume where a log filter is constructed. The log filter is constructed using the drop method that was preferred from the first experiment. The roughness, stability and porous flow of a log filter are investigated. The results are compared with what is known for rock filters. Tree branches were used as model logs. This was done to be able to correctly scale the results to prototype scale. Primary reason for this was the effect of bark on the roughness of a cylinder. This is difficult to replicate on model scale. Using branches of trees that will be used Saturating the model logs however was more time consuming than initially expected. Attempts were made to accelerate the process but they were futile. One method, using a diaphragm vacuum pump, could not be applied due to lack of resources. For any future research on the topic of tree branches as model logs it is highly recommended to use a vacuum pump to ensure that the maximum density is reached. From the first experiment it was concluded that large quantities of logs can still be used to create functional log filters. This is a positive result as this will reduce construction time on prototype scale. The method used was a funnel. This method was applied in the flume to create the log filters. By measuring the velocity profile for multiple discharges the roughness of a log filter was measured. This also resulted in an equation of the shear velocity as a function of the discharge. By increasing the discharge step by step, several mobility stages of a log filter were found. This resulted in a dataset that could be directly compared with the Izbash and Shields equations for rock. Higher critical Shields parameters were observed than for rock of the same diameter. The behaviour of a log filter differed from a rock filter in the transition from one stage to another (stable to mobile to transport to failure) did not occur slowly, but almost instantaneous. This behaviour is unwanted because it is difficult to monitor in what stage a log filter is if no changes can be observed between stages. Thus, although applying the equations for rock filters to log filters are conservative, the behaviour of log filters are more sudden and prone to escalation close to their critical thresholds. Final conclusion is that more research is required to better understand the significance of variables for the settling behaviour and stability. These are water depth, log diameter independent of density and vice versa, log orientation and log length to diameter ratio. This can be done by doing more experiments in a similar fashion where only one variable is changed at a time. For the application of the design criteria for rock to a log filter with regards to the pilot project, it is recommended to be conservative. Based on these experiments it is safe to assume that when the most unfavourable scenario is used (e.g. low log density, small log diameter, high flow velocities near the bed) a sufficient design is made, especially if the top layer(s) of the filter are placed parallel to the flow direction. Backfilling of the log filter did not increase the stability significantly in this research and is only be beneficial for scour protection
An Overview of wood in rivers
No full textWood can be used to rehabilitate degraded water bodies (lakes and rivers). However wood has historically been removed from river systems to improve flood protection, inland navigation and drink water quality. These actions reduced and degraded the aquatic habitat of the effected river systems. Rijkswaterstaat is interested in reintroducing wood to rehabilitate the aquatic (and terrestrial) habitat of river systems.In order to successfully reintroduce wood in river systems it is necessary to identify where the wood comes from? How is it transported? How does it accumulate? And what are the effects on stream ecology and geomorphology? This knowledge can be used to determine if already naturally occurring wood in river systems can be managed to achieve the goal of river rehabilitation. If no or too little wood is present in the river system, an engineered solution can be used. This engineered solution is known as Engineered Log Jam (ELJ). These structures use wood as construction material to rehabilitate rivers. The stability, design and implementation of ELJs in rivers is a complex process.This report provides an overview on the identification, classification, importance and management of wood in river systems. Secondly the gives an overview of studies done on the stability of wood in rivers, the design (process) of ELJs and the geomorphological impact of ELJs on river systems. From the studies reviewed in this report it is clear that wood plays an important role in river systems. Wood directly effect river ecology and geomorphology by forming log jams. Proper management of wood is therefore required if one wishes to retain a healthy river system. Where one wishes to (re)introduce wood in a river system using ELJ structures the design process is vital. The first step is to identify the characteristics and properties of the river section. The second step is designing the correct ELJs for the desired goals. The last step is constructing and monitoring the ELJs. Evaluation is important to obtain points of improvement
Aortic arch morphometry in living humans
No full textAnatomical features of the aortic arch such as its steepness, the take-off angles and the distances between its supra-aortic branches can influence the feasibility and difficulty of interventional and/or surgical maneuvers. These anatomical characteristics were assessed by means of 3D multiplanar reconstruction of thoracic angio-computed tomography scans of 92 living patients (79 males, 13 females, mean age 69.4 ± 9.9 years) carried out for various indications (gross pathology of the thoracic aorta excluded). There was a significant variation of all measured parameters between the subjects - a standard aortic arch (i.e. with all measured parameters within 2 SD) does not seem to exist. There were no significant differences between genders but some of the parameters correlated significantly to age
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