Siamese Convolutional Neural Networks to Quantify Crack Pattern Similarity in Masonry Facades

This paper proposes an automated approach to predict crack pattern similarities that correlate well with assessment by structural engineers. We use Siamese convolutional neural networks (SCNN) that take two crack pattern images as inputs and output scalar similarity measures. We focus on 2D masonry facades with and without openings. The image...

Development Of A Neural Network Embedding For Quantifying Crack Pattern Similarity In Masonry Structures

The degree of similarity between damage patterns often correlates with the likelihood of having similar damage causes. Therefore, deciding whether crack patterns are similar is one of the key steps in assessing the conditions of masonry structures. To our knowledge, no literature has been published regarding masonry crack pattern similarity...

Phosphorus concentration in water affects the biofilm community and the produced amount of extracellular polymeric substances in reverse osmosis membrane systems

Biofouling is a problem that hinders sustainable membrane-based desalination and the stratification of bacterial populations over the biofilm’s height is suggested to compromise the efficiency of cleaning strategies. Some studies reported a base biofilm layer attached to the membrane that is harder to remove. Previous research suggested...

Pilot-scale assessment of urea as a chemical cleaning agent for biofouling control in spiral-wound reverse osmosis membrane elements

Routine chemical cleaning with the combined use of sodium hydroxide (NaOH) and hydrochloric acid (HCl) is carried out as a means of biofouling control in reverse osmosis (RO) membranes. The novelty of the research presented herein is in the application of urea, instead of NaOH, as a chemical cleaning agent to full-scale spiral-wound RO...

Enhanced biofilm solubilization by urea in reverse osmosis membrane systems

Chemical cleaning is routinely performed in reverse osmosis (RO) plants for the regeneration of RO membranes that suffer from biofouling problems. The potential of urea as a chaotropic agent to enhance the solubilization of biofilm proteins has been reported briefly in the literature. In this paper the efficiency of urea cleaning for RO...

Applicability of short-term accelerated biofouling studies to predict long-term biofouling in reverse osmosis membrane systems

Biofouling studies addressing biofouling control are mostly executed in short-term studies. It is unclear whether data collected from these experiments are representative for long-term biofouling as occurring in full-scale membrane systems. This study investigated whether short-term biofouling studies accelerated by biodegradable nutrient...

Porosity of spacer-filled channels in spiral-wound membrane systems: Quantification methods and impact on hydraulic characterization

The porosity of spacer-filled feed channels influences the hydrodynamics of spiral-wound membrane systems and impacts the overall performance of the system. Therefore, an exact measurement and a detailed understanding of the impact of the feed channel porosity is required to understand and improve the hydrodynamics of spiral-wound membrane...

Reduction of ripening time of full-scale manganese removal filters with manganese oxide-coated media

Effective manganese removal by conventional aeration-filtration with virgin filter media requires a long ripening time. The aim of this study was to assess the potential of manganese oxide-coated media to shorten the ripening time of filters with virgin media, under practical conditions. A full scale filter filled with virgin sand and a full...

Hydraulic Biofilm Resistance

Surface-Charge-Governed Ion Transport in Nanofluidic Channels

Bouwstenen "Terrein, Zeewering en Golfbreker" voor Maasvlakte 2

Als basis voor een onderbouwde keuze van ontwerpvarianten voor Maasvlakte 2 en ter ondersteuning van de PKB/MER procedure, is in deze studie een aantal alternatieven uitgewerkt voor de zogenoemde bouwstenen Terrein, Zeewering en Golfbreker. De alternatieven zijn vooraf, door de Projectorganisatie Maasvlakte 2, geselecteerd naar aanleiding van o...

Verbetering van het ontwerp en de berekeningsmethode van een traagheidsmeettoestel voor motorfietsen

IJsselmeergebied: Waterhart van Noord-Nederland of met het Markermeer kan meer

De drinkwatervoorbereiding uit oppervlaktewater in de jaren negentig

Een onderzoek naar de stabiliteit van een straddle carrier in BAMMS

Zuivering van Rijnwater met behulp van coagulatie en ozonisatie