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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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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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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

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The effect of a mobile HEPA filter system on ‘infectious’ aerosols, sound and air velocity in the SenseLab

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

High efficiency air filtration has been suggested to reduce airborne transmission of ‘infectious’ aerosols. In this study the ‘air cleaning’ effect as well as the effect on sound and air velocity (draught risk) of a mobile High-Efficiency Particulate Air (HEPA) filter system was tested for different settings and positions in the Experience room...

journal article 2021

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Building characteristics associated with self-reported dry eyes and headaches of outpatient workers in hospital buildings

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

Building-related health symptoms are multifactorial, hence a comprehensive study is needed to identify associations of such symptoms with building aspects. Previous studies have identified certain building characteristics as risk factors for both dry eyes and headaches, which are among the most prevalent symptoms suffered by office workers....

journal article 2021

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The power of ECG in multimodal patient-specific seizure monitoring: Added value to an EEG-based detector using limited channels

Vandecasteele, Kaat (author), De Cooman, Thomas (author), Chatzichristos, Christos (author), Cleeren, Evy (author), Swinnen, Lauren (author), Ortiz, Jaiver Macea (author), Van Huffel, Sabine (author), Dümpelmann, Matthias (author), Schulze- Bonhage, Andreas (author), De Vos, Maarten (author), Van Paesschen, Wim (author), Hunyadi, Borbala (author)

Objective: Wearable seizure detection devices could provide more reliable seizure documentation outside the hospital compared to seizure self-reporting by patients, which is the current standard. Previously, during the SeizeIT1 project, we studied seizure detection based on behind-the-ear electroencephalography (EEG). However, the obtained...

journal article 2021

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Substantiation of home occupant archetypes with the use of generative techniques: analysis and results of focus groups

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

A previous study clustered home occupants into archetypes with a questionnaire. This study uses qualitative methods to strengthen those previously-found archetypes with data pertaining to the participants’ home experiences. Focus groups were carried out where generative activities were conducted involving the generation of collages. The first...

journal article 2020

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Indoor environmental quality related risk factors with energy-efficient retrofitting of housing: A literature review

Ortiz, Marco A. (author), Itard, L.C.M. (author), Bluyssen, P.M. (author)

There are indications that energy-retrofitted buildings can create risks for indoor environmental quality (IEQ) and therefore for health and comfort of occupants. A review was conducted to identify and verify those risks, within three themes: building envelope, heating, ventilating and air conditioning (HVAC)-systems, and occupants. Publications...

journal article 2020

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Workshop with 335 primary school children in The Netherlands: What is needed to improve the IEQ in their classrooms?

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

To identify current problems in the classroom and to conceptualize design solutions by primary school children to solve these problems, 335 children from seven primary schools participated in a workshop held in the Experience room of the SenseLab, comprising of two parts. In part 1, the children were asked to think about their own classroom...

journal article 2020