Probabilistische methoden bij het ontwerpen van duinafslag

This report provides the background of the Dutch guidelines on dune erosion (Leidraad Duinafslag). In these guidelines a probabilistic level 1 approach is used. The required calibration parameters are determined in this research report. A large number of probabilistic computations have been made in order to calibrate the level 1 approach in the guidelinesHydraulic EngineeringCivil Engineering and Geoscience

In search of a better sediment mixing coefficient model

Results of sediment transport calculations are often necessary in solving practical coastal engineering problems. (Sediment transport due to waves and currents). Many transport formulae have been proposed in literature in the past. Selection of the proper one while solving a particular problem, is a difficult task for a coastal engineer. In considering sediment transport under wave-current conditions it is worthwhile to make a distinction between two situations, viz.: The fluctuations in the orbital motion have to be fully taken into account in order to find the resulting sediment transport (intra-wave type of description; often: cross-shore sediment transport); - It is sufficient to take time-averaged effects of the waves into account in order to find the resulting sediment transport rate (intra-wave type of description is not required; often: longshore sediment transport). For the longshore sediment transport mode, transport formulae based on time-averaged velocity distributions and time-averaged sediment concentration distributions over the water depth can often be used. The present paper is restricted to this type of formula.Civil Engineering and Geoscience

De bereiding van kaliumpersulfaat; De bereiding van geconcentreerde waterstofperoxyde oplossing

Document(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science

A Multiclass Classification Model for Tooth Removal Procedures

Surprisingly little is known about tooth removal procedures. This might be due to the difficulty of gaining reliable data on these procedures. To improve our understanding of these procedures, machine learning techniques were used to design a multiclass classification model of tooth removal based on force, torque, and movement data recorded during tooth removal. A measurement setup consisting of, among others, robot technology was used to gather high-quality data on forces, torques, and movement in clinically relevant dimensions. Fresh-frozen cadavers were used to match the clinical situation as closely as possible. Clinically interpretable variables or “features” were engineered and feature selection took place to process the data. A Gaussian naive Bayes model was trained to classify tooth removal procedures. Data of 110 successful tooth removal experiments were available to train the model. Out of 75 clinically designed features, 33 were selected for the classification model. The overall accuracy of the classification model in 4 random subsamples of data was 86% in the training set and 54% in the test set. In 95% and 88%, respectively, the model correctly classified the (upper or lower) jaw and either the right class or a class of neighboring teeth. This article discusses the design and performance of a multiclass classification model for tooth removal. Despite the relatively small data set, the quality of the data was sufficient to develop a first model with reasonable performance. The results of the feature engineering, selection process, and the classification model itself can be considered a strong first step toward a better understanding of these complex procedures. It has the potential to aid in the development of evidence-based educational material and clinical guidelines in the near future.Learning & Autonomous Contro

Robot Technology in Analyzing Tooth Removal: A Proof of Concept

a measurement setup is proposed that, for the first time, is capable of capturing the combination of high forces and subtle movements exerted during tooth removal procedures in high detail and in a reproducible manner by using robot technology. The outcomes of a design process from a collaboration between clinicians, mechanical and software engineers together with first results are presented in this proof of concept.Clinical relevance - by measuring all aspects of tooth removal in a single setup a strong database can be build that will deliver the data needed to gain scientific understanding of what makes (un)successful tooth removal. It gives a unique opportunity to model the procedure, evaluate techniques, understand and predict adverse events as well as to create new evidence-based teaching methods.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.Support Biomechanical EngineeringLearning & Autonomous Contro

Sonocrystallization, Nucleation of ammonium sulfate and alfa-lactose monohydrate due to ultrasonic irradiation

Experiments were conducted to investigate the nucleation of ammonium sulfate and alfa-lactose monohydrate under ultrasonic irradiationIntensified Reaction & Separation SystemsProcess and EnergyMechanical, Maritime and Materials Engineerin

7up - Zevenkamp als case study voor een duurzame herstructurering van jaren '70 en '80 wijken.

Duurzame (her)ontwikkeling is in de stedenbouw een vanzelfsprekend uitgangspunt geworden. In theorie en praktijk is er echter nog geen eenduidige definitie, noch een benadering van duurzame stedenbouw. Dit boek is het resultaat van een ontwerpend onderzoek waarin verschillende benaderingen van duurzame stedenbouw op één locatie zijn uitgeprobeerd. Voor de wijk Zevenkamp in Rotterdam zijn drie aanvliegroutes gekozen: een ecosysteem benadering, een stromen benadering en het ooghoogte perspectief van bewoners. Het resultaat is een nieuwe vergelijking van de verschillende vormen van duurzame stedenbouw en ook inzicht in kansrijke combinaties en mogelijke strijdigheden. De methodiek van ontwerpend onderzoek geeft naast ontwerpen voor Zevenkamp, ook een mooie set aan ontwerpoplossingen die veelal generiek zijn voor dit type herstructureringsopgave. Een aantal van de 50 richtlijnen staat in dit boek, de gehele set vormt een instrument die locatie specifiek kan worden ingezet voor werkelijk integrale duurzame (her)ontwikkeling.UrbanismArchitectur

De zuurgas verwijdering uit aardgas

Document(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science

Towards intentional aesthetics within topology optimization by applying the principle of unity-in-variety

Topology optimization is increasingly applied to design consumer products, for which aesthetics plays an important role to consumer acceptance. In industrial design, it is known that preferences or taste judgement obey certain rules or principles. These principles are not directly quantifiable, but can qualitatively predict and explain aesthetic responses. In this paper, we empirically evaluate whether or not these design principles are effective for increasing the appealingness of topology optimized shapes. Our starting point is an overarching principle known as Unity-in-Variety. Variety stimulates our interests, whilst unity helps us make sense of a design in its entirety. According to this principle, aesthetic appreciation is maximized when a balance in unity and variety is attained. Since designs from topology optimization often exhibit remarkable complexity and variety, we hypothesize that increasing unity is the key to reach a balance and thus to elevate aesthetic appreciation in topology optimization. In our experimental setup, designs from topology optimization were manually post-processed, with the intention to increase unity, by following the “principles of perceptual grouping”, known as Gestalt principles. Our user study shows that in 11 out of the 12 pairs of topology optimized designs and their modified counterparts, the modified designs are perceived by the majority as visually more appealing, confirming our hypothesis. These findings provide a good basis for improving the aesthetic pleasure of topology optimized designs, either manually or ultimately by integrating them in the topology optimization formulation. It is expected that this eventually will contribute to a wider acceptance of topology optimization for consumer product design.Hospitality & Events Support OperationsIndustrial Design EngineeringDesign AestheticsTechnical Suppor

On a tandem queue with batch service and its applications in wireless sensor networks

We present a tandem network of queues 0 , ⋯ , s- 1. Customers arrive at queue 0 according to a Poisson process with rate λ. There are s independent batch service processes at exponential rates μ0, ⋯ , μs - 1. Service process i, i= 0 , ⋯ , s- 1 , at rate μi is such that all customers of all queues 0 , ⋯ , i simultaneously receive service and move to the next queue. We show that this system has a geometric product-form steady-state distribution. Moreover, we determine the service allocation that minimizes the waiting time in the system and state conditions to approximate such optimal allocations. Our model is motivated by applications in wireless sensor networks, where s observations from different sensors are collected for data fusion. We demonstrate that both optimal centralized and decentralized sensor scheduling can be modeled by our queueing model by choosing the values of μi appropriately. We quantify the performance gap between the centralized and decentralized schedules for arbitrarily large sensor networks.Aerospace Transport & Operation