Searched for: subject%3A%22Variability%22
(1 - 20 of 258)

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Peters, S.L.A. (author), Tabasi, A. (author), Kingma, I. (author), van Dijk, W. (author), van Dieën, J.H. (author)
Mechanical loading of the low-back is an important risk factor for the development of low-back pain. Real-time estimation of the L5S1 joint moment (ML5S1) can give an insight to reduce mechanical loading. Model accuracy depends on sensor information, limiting the number of input variables to estimate ML5S1 increases practical feasibility, but...
article 2023
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de Vries, H.J. (author), Pennings, H.J.M. (author), van der Schans, C.P. (author), Sanderman, R. (author), Oldenhuis, H.K.E. (author), Kamphuis, W. (author)
The effects of stress may be alleviated when its impact or a decreased stress-resilience are detected early. This study explores whether wearable-measured sleep and resting HRV in police officers can be predicted by stress-related Ecological Momentary Assessment (EMA) measures in preceding days and predict stress-related EMA outcomes in...
article 2023
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de Vries, H. (author), Oldenhuis, H. (author), van der Schans, C. (author), Sanderman, R. (author), Kamphuis, W. (author)
The emergence of wearable sensor technology may provide opportunities for automated measurement of psychophysiological markers of mental and physical fitness, which can be used for personalized feedback. This study explores to what extent within-subject changes in resting heart rate variability (HRV) during sleep predict the perceived mental and...
article 2023
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Nycander, E. (author), Morales-Espana, G. (author), Soder, L. (author)
We propose a power-based unit commitment formulation with capacity and intra-hour ramp reserves for dealing with intra-hour wind power variability and uncertainty. Although the formulation has an hourly resolution, the intra-hour ramp requirements capture wind power ramp excursions with a time duration below one hour, and thus allows the...
article 2022
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Landman, A. (author), Pennings, H. (author), Blankendaal, R. (author), van den Bosch, K. (author), Groen, E. (author)
Many professions require procedural skills to perform routine tasks, as well as adaptive skills to deal with unexpected situations. Whereas routine skills are acquired by repetitive practice of the same task, adaptive skills develop with variability of practice. We hypothesize that negative transfer may occur when routine skills are trained with...
report 2022
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McNally, K. (author), Goede, H.A. (author), Schinkel, J. (author), Gorce, J.P. (author), Warren, N. (author)
The dermal Advanced REACH Tool (dART) is a tier 2 exposure model for estimating dermal exposure to the hands (mg min-1) for non-volatile liquid and solid-in-liquid products. The dART builds upon the existing ART framework and describes three mass transport processes (deposition (Dhands), direct emission and direct contact (Ehands), and contact...
article 2022
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Austin, P.C. (author), van Buuren, S. (author)
Background: Multiple imputation is frequently used to address missing data when conducting statistical analyses. There is a paucity of research into the performance of multiple imputation when the prevalence of missing data is very high. Our objective was to assess the performance of multiple imputation when estimating a logistic regression...
article 2022
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de Vries, H. (author), Kamphuis, W. (author), van der Schans, C. (author), Sanderman, R. (author), Oldenhuis, H. (author)
The emergence of wearable sensors that allow for unobtrusive monitoring of physiological and behavioural patterns introduces new opportunities to study the impact of stress in a real-world context. This study explores to what extent within-subject trends in daily Heart Rate Variability (HRV) and daily HRV fluctuations are associated with...
article 2022
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Younis, A. (author), Benders, R. (author), Ramirez, J. (author), de Wolf, M. (author), Faaij, A. (author)
The large-scale integration of variable renewable energy sources into the energy system presents techno–economic challenges. Long–term energy system optimization models fail to ade quately capture these challenges because of the low temporal resolution of these tools. This limitation has often been addressed either by direct improvements within...
article 2022
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Bowens-Rubin, R. (author), Bos, A. (author), Hinz, P. (author), Holden, B. (author), Radovan, M. (author)
As we enter the era of TESS and JWST, instrumentation that can carry out radial velocity measurements of exoplanet systems is in high demand. We will address this demand by upgrading the UC Lick Observatory’s 2.4-meter Automated Planet Finder (APF) telescope with an adaptive optics (AO) system. The AO upgrade will be directly integrated into the...
conference paper 2022
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van Stralen, J. (author), Della Longa, F. (author), Daniels, B.W. (author), Smekens, K.E.L. (author), van der Zwaan, B. (author)
This article introduces and describes OPERA, a new technology-rich bottom-up energy system optimization model for the Netherlands. We give a detailed specification of OPERA’s underlying methodology and approach, as well as a description of its multiple applications. The model has been used extensively to formulate strategic policy advice on...
article 2021
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Morales-Espana, G.A. (author), Nycander, E. (author), Sijm, J. (author)
To lower pollution, it became imperative to integrate as much renewable energies as possible in power systems. This has been translated into forcing the maximum production of variable renewable energy (VRE) ---wind and solar--- into power systems operation. The increasing operational costs to maximize the VRE output became the price to pay in...
conference paper 2021
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Sabbadini, A. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)
Current ultrasonic clamp-on flow meters consist of a pair of single-element transducers which are carefully positioned before use. This positioning process consists of manually finding the distance between the transducer elements, along the pipe axis, for which maximum SNR is achieved. This distance depends on the sound speed, thickness and...
article 2021
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Imants, P. (author), Theeuwes, J. (author), Bronkhorst, A.W. (author), Martens, M.H. (author)
With the arrival of new technologies more en-route traffic information sources have become available, especially in-car information sources. The aim of this study is to gain more insight into the effect of multiple, and possibly conflicting, sources of information on route choice and driver behaviour. In a driving simulator experiment,...
article 2021
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Morales España, G.A. (author), Nycander, E. (author), Sijm, J.P.M. (author)
To lower CO2 emissions, policy makers want to integrate as much variable renewable energy (VRE) as possible into power systems. This has been translated into targets for VRE as a share of total electricity generation and policies that aim to maximize the use of electricity available from VRE sources. However, in this paper we demonstrate that it...
article 2021
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Dieguez, M.S. (author), Fattahi, A. (author), Sijm, J.P.M. (author), Morales España, G.A. (author), Faaij, A. (author)
In this paper, we present an optimisation integrated energy system model (IESA-Opt) for the Netherlands with the use of a linear programming formulation. This state-of-the-art model represents a scientific contribution as it integrates a European power-system model with a complete sectoral representation of the energy system technologies and...
article 2021
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Helisto, N. (author), Kiviluoma, J. (author), Morales España, G.A. (author), O'Dwyer, C. (author)
Planning of future energy systems with higher prevalence of wind and solar energy requires a careful representation of the temporal and operational characteristics of the system in the investment planning model. This study aims to identify the aspects that should be considered when selecting the representation for a particular system. To...
article 2021
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de Vries, H. (author), Kamphuis, W. (author), Oldenhuis, H. (author), van der Schans, C. (author), Sanderman, R. (author)
Background: The emergence of smartphones and wearable sensor technologies enables easy and unobtrusive monitoring of physiological and psychological data related to an individual’s resilience. Heart rate variability (HRV) is a promising biomarker for resilience based on between-subject population studies, but observational studies that apply a...
article 2021
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Austin, P.C. (author), White, I.R. (author), Lee, D.S. (author), van Buuren, S. (author)
Missing data is a common occurrence in clinical research. Missing data occurs when the value of the variables of interest are not measured or recorded for all subjects in the sample. Common approaches to addressing the presence of missing data include complete-case analyses, in which subjects with missing data are excluded, or mean-value...
article 2021
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Bowens-Rubin, R. (author), Dillon, D. (author), Hinz, P.M. (author), Kuiper, S. (author)
Advancements in high-efficiency hybrid variable reluctance (HVR) actuators are an enabling technology for building the next generation of large-format deformable mirrors, including adaptive secondary mirrors. The Netherlands Organization for Applied Scientific Research (TNO) has developed a new style of hybrid variable reluctance actuator that...
conference paper 2021
Searched for: subject%3A%22Variability%22
(1 - 20 of 258)

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