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Experimental evidence for the two-path description of neutron spin echo

McKay, S. (author), Irfan, A. A.M. (author), Le Thien, Q. (author), Geerits, N. (author), Parnell, S.R. (author), Dalgliesh, R. M. (author), Lavrik, N. V. (author), Kravchenko, I. I. (author), Ortiz, G. (author), Pynn, R. (author)

We describe an experiment that strongly supports a two-path interferometric model in which the spin-up and spin-down components of each neutron propagate coherently along spatially separated parallel paths in a typical neutron spin-echo small-angle scattering (SESANS) experiment. Specifically, we show that the usual semi-classical, single...

journal article 2024

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Indicators and methods for assessing acoustical preferences and needs of students in educational buildings: A review

Hamida, A.B. (author), Zhang, D. (author), Ortiz, Marco A. (author), Bluyssen, P.M. (author)

Sounds (e.g., human activity, nature, building systems) are one of the indoor environmental stimuli that may have positive and/or negative effects on students’ well-being and performance in educational buildings. Students in educational buildings have individual acoustical preferences and needs as portrayed by occupant-related indicators, for...

journal article 2023

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Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K_1-xV₃Sb₅

Wang, Y. (author), Yang, Shuo Ying (author), Sivakumar, Pranava K. (author), Ortiz, Brenden R. (author), Teicher, Samuel M.L. (author), Wu, H. (author), Srivastava, Abhay K. (author), Garg, Chirag (author), Ali, M.N. (author)

Materials with Kagome nets are of particular importance for their potential combination of strong correlation, exotic magnetism, and electronic topology. KV3Sb5 was discovered to be a layered topological metal with a Kagome net of vanadium. Here, we fabricated Josephson Junctions of K1-xV3Sb5 and induced superconductivity over long junction...

journal article 2023

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Associations between self-reported IEQ stressors of students' homes and self-reported rhinitis, stuffy nose, migraine and headache in student profiles

Bluyssen, P.M. (author), Zhang, D. (author), Ortiz, Marco A. (author)

Recent studies have shown that both personal and building-related factors may affect the health and comfort of occupants in their homes. It is also known that people differ in their needs and can therefore respond differently to these stressors. Therefore, based on the large database from the survey conducted yearly from 2016 to 2020 among the...

journal article 2023

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Profiling office workers based on their self-reported preferences of indoor environmental quality and psychosocial comfort at their workplace during COVID-19

Ortiz, Marco A. (author), Bluyssen, P.M. (author)

Due to the COVID-19 pandemic, a large number of office workers were required to conduct their work from home. Little is known about the indoor environmental quality (IEQ) preferences and psychosocial comfort preferences of staff working from home. Therefore this study aimed to cluster office workers working at home based on their self-reported...

journal article 2022

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Indoor environmental quality, energy effciency and thermal comfort in the retroftting of housing: A literature review

Ortiz, Marco A. (author), Bluyssen, P.M. (author)

Building retrofitted to be resilient in the face of future climates may present risks for the health and comfort of the occupants, due to the indoor environmental quality changes involved under current building practices. This chapter is a literature review of recent peer-reviewed papers from a variety of fields identifying such potential...

book chapter 2022

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Students’ self-reported health and psychosocial status at home before and during COVID-19

Hamida, A.B. (author), Zhang, D. (author), Ortiz, Marco A. (author), Bluyssen, P.M. (author)

During the COVID-19 outbreak, university courses were shifted online and students spent the majority of their time inside their homes. However, staying indoors can affect students’ health due to the exposure to several environmental stressors, such as background noise, and/or inefficient ventilation, and/or insufficient lighting. Previous...

conference paper 2022

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Office workers’ health during the pandemic lockdown in the Netherlands

Ortiz, Marco A. (author), Bluyssen, P.M. (author)

The worldwide spread of the Coronavirus disease 2019 forced governments to enact different measures to mitigate the infections. Employers and workers had to adjust by shifting a substantial number of jobs to a “work from home” configuration (WFH). On average, people used to spend around 90% of their time indoors, however, this number may have...

conference paper 2022

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Visualisation of the airflow pattern of exhaled droplets in a classroom

Liu, Y.L. (author), Ortiz, Marco A. (author), Zhang, D. (author), Bluyssen, P.M. (author)

The airborne transmission of SARS-CoV-2 in educational buildings has raised concerns during the current COVID-19 pandemic. In this study, a portable fog generator system was designed and assembled to visualise the airflow pattern of exhaled droplets in a classroom. The system consists of five components: medium, fog generator, buffer, pump, and...

conference paper 2022

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Airborne SARS-CoV-2 in home and hospital environments investigated with a high-powered air sampler

de Man, Peter (author), Ortiz, Marco A. (author), Bluyssen, P.M. (author), de Man, Stijn J. (author), Rentmeester, Marie-Jozé (author), van der Vliet, Marijke (author), Wils, Evert-Jan (author), Ong, David S.Y. (author)

Background: The initial aim was to study the effects of face masks worn by recently infected individuals on the airborne spread of SARS-CoV-2, but findings motivated us to proceed with comparing the presence of SARS-CoV-2 in air samples near infected individuals at home with those near infected intensive care unit (ICU) patients. Aim: To...

journal article 2022

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Load testing of a deteriorated prestressed concrete girder bridge without plans

Castellanos-Toro, Sebastián (author), Millán, Diana (author), Ortiz, Albert R. (author), Marulanda, Johannio (author), Thomson, Peter (author), Lantsoght, E.O.L. (author)

In this study, a prestressed concrete girder bridge without plans and with severe levels of deterioration, located in Cali, Colombia, was load-tested to quantify, experimentally, its live-load behavior. The bridge consists of seven prestressed I-girders covered with a reinforced concrete deck, and four diaphragm beams. A geometric survey was...

journal article 2022

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Carbon dioxide fixation via production of succinic acid from glycerol in engineered Saccharomyces cerevisiae

Malubhoy, Zahabiya (author), Bahia, Frederico Mendonça (author), de Valk, Sophie Claire (author), de Hulster, A.F. (author), Rendulić, Toni (author), Ortiz, Juan Paulo Ragas (author), Xiberras, Joeline (author), Klein, Mathias (author), Mans, R. (author), Nevoigt, Elke (author)

Background: The microbial production of succinic acid (SA) from renewable carbon sources via the reverse TCA (rTCA) pathway is a process potentially accompanied by net-fixation of carbon dioxide (CO₂). Among reduced carbon sources, glycerol is particularly attractive since it allows a nearly twofold higher CO₂-fixation...

journal article 2022

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Usability assessment of an interactive health technology for kidney living donors: protocol for a prospective cross-sectional survey

Ortiz, Fernanda (author), Giunti, Guido (author)

Introduction Several web portals for kidney patients are available, but assessments of their performance are scarce. A crucial aspect of living donation is to provide standardised information about the risks of the procedure. This is of particular interest among candidates for kidney living donation. In 2019, the Digital Care Path for Living...

journal article 2022

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A review on indoor environmental quality in sports facilities: Indoor air quality and ventilation during a pandemic

Zhang, D. (author), Ortiz, Marco A. (author), Bluyssen, P.M. (author)

Because of COVID-19, the indoor environmental quality (IEQ) in sports facilities has been a concern to environmental health practitioners. To develop an overall understanding of the available guidelines and standards and studies performed on IEQ in sports facilities, an extensive literature study was conducted, with the aim of identifying: (1)...

journal article 2022

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Self-reported rhinitis and headaches of students from universities in Taiwan, Chile, Suriname, China and the Netherlands, and its association with their home environment

Bluyssen, P.M. (author), Zhang, D. (author), Ortiz, Marco A. (author)

Next to personal, psychosocial and physiological aspects, environmental aspects of homes may affect the health and comfort of their occupants. This study aimed to investigate the multifactorial character of both rhinitis and headaches among five groups of students from universities in five different cities: Taichung (Taiwan), Concepcion (Chile),...

journal article 2021

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An overview of transparent and translucent 3D-printed façade prototypes and technologies

Ghasemieshkaftaki, M. (author), Ortiz, Marco A. (author), Bluyssen, P.M. (author)

3D-printing has transformed traditional manufacturing by enabling the fabrication of individually designed complex systems. The building’s façade is one of the most challenging systems because it affects the control of the built indoor environment and allows to provide energy-saving.<br/>The objective of this research is to distinguish 3D...

conference paper 2021

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A method to visualize and quantify "aerosols" of outward leakage around the perimeter of barrier masks

Ortiz, Marco A. (author), Bluyssen, P.M. (author)

Due to the SARS-CoV-2 pandemic, several strategies have been proposed to reduce its transmission, from social distancing, regularly disinfecting items and hands, and wearing barrier masks. Guidelines and standardization propose certain tests for the filtration of the masks, or visual inspections to check the materials. However, no standards...

conference paper 2021

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Preferences for Indoor Environmental and Social Comfort of Outpatient Staff during the COVID-19 Pandemic, an Explanatory Study

Eijkelenboom, A.M. (author), Ortiz, Marco A. (author), Bluyssen, P.M. (author)

While the pressure on hospital workers keeps growing, they are generally more dissatisfied with their comfort than other occupants in hospitals or offices. To better understand the comfort of outpatient workers in hospitals, clusters for preferences and perceptions of the indoor environmental quality (IEQ) and social comfort were identified in a...

journal article 2021

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Sediment transport prediction in sewer pipes during flushing operation

Montes, Carlos (author), Ortiz, Hachly (author), Vanegas, Sergio (author), Kapelan, Z. (author), Berardi, Luigi (author), Saldarriaga, Juan (author)

This paper presents a novel model for predicting the sediment transport rate during flushing operation in sewers. The model was developed using the Evolutionary Polynomial Regression Multi-Objective Genetic Algorithm (EPR-MOGA) methodology applied to new experimental data collected. Using the new model, a series of design charts were...

journal article 2021

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Testing of outward leakage of different types of masks with a breathing manikin head, ultraviolet light and coloured water mist

Ortiz, Marco A. (author), Ghasemieshkaftaki, M. (author), Bluyssen, P.M. (author)

Since the outbreak of COVID-19, wearing a mask, voluntary or obligatory, has led to diverse and numerous designs. Guidelines for minimum requirements include tests for visual inspection, strength, filtration, and breathing resistance, but not for the fit of a mask. The fit of a mask was assessed by testing the outward leakage of exhaled...

journal article 2021