Search results for "twin"
showing 10 items of 435 documents
A Digital Twin predictive maintenance framework of air handling units based on automatic fault detection and diagnostics
2022
The building industry consumes the most energy globally, making it a priority in energy efficiency initiatives. Heating, ventilation, and air conditioning (HVAC) systems create the heart of buildings. Stable air handling unit (AHU) functioning is vital to ensuring high efficiency and extending the life of HVAC systems. This research proposes a Digital Twin predictive maintenance framework of AHU to overcome the limitations of facility maintenance management (FMM) systems now in use in buildings. Digital Twin technology, which is still at an initial stage in the facility management industry, use Building Information Modeling (BIM), Internet of things (IoT) and semantic technologies to create…
Co-simulated Digital Twin on the Network Edge: the case of platooning
2022
This paper presents an approach to create high fidelity Digital-Twin models for distributed multi-agent cyber-physical systems based on the combination of simulating components, generated from different modeling languages, each tailored for the specific domain of the subsystem. The approach specifically addresses the wireless communication domain, exploiting a Python module as a simulating component to evaluate the impact of network delay among the distributed elements of the system under analysis. A case study with a platoon of four vehicles following a leading car, all modeled in Simulink, is used to show the applicability of the approach, allowing the comparison between a Vehicle-to-Vehi…
Progetto Digital Twins: un sopralluogo analogico e digitale a Gratosoglio. Lo sguardo da Palermo
2022
The description of an ongoing project has the value of establishing some points of reflection useful to adjust the shot for the next phases of an experiment. In this paper, we are describing an ongoing project between Politecnico di Milano and Università degli Studi di Palermo. The feature on which this experimentation focuses is the analog/ digital survey, which tries to generate a “satellite” point of view, (a group of people physically in the analyzed area), and a “remote” one. The paper, firstly underlines the importance of surveys in urban planning, secondly displays the techniques, operators and equipment which are needed and it concludes with some considerations.
Physical activity and health: Findings from Finnish monozygotic twin pairs discordant for physical activity
2021
AbstractGenetic and early environmental differences including early health habits associate with future health. To provide insight on the causal nature of these associations, monozygotic (MZ) twin pairs discordant for health habits provide an interesting natural experiment. Twin pairs discordant for leisure-time physical activity (LTPA) in early adult life are thus a powerful study design to investigate the associations between long-term LTPA and indicators of health and wellbeing. We have used this study design by identifying 17 LTPA discordant twin pairs from two Finnish twin cohorts and summarize key findings of these studies in this paper. The carefully characterized rare long-term LTPA…
Personal Goals of Older Female Twins
2009
This study examined genetic and environmental influences on older women’s personal goals by using data from the Finnish Twin Study on Aging. The interview for the personal goals was completed by 67 monozygotic (MZ) pairs and 75 dizygotic (DZ) pairs. The tetrachoric correlations for personal goals related to health and functioning, close relationships, and independent living were higher in MZ than DZ twins, indicating possible genetic influence. The pattern of tetrachoric correlations for personal goals related to cultural activities, care of others, and physical exercise indicated environmental influence. For goals concerning health and functioning, independent living, and close relationsh…
2012
BackgroundIncreased reaction time variability (RTV) on cognitive tasks requiring a speeded response is characteristic of several psychiatric disorders. In attention deficit hyperactivity disorder (ADHD), the association with RTV is strong phenotypically and genetically, yet high RTV is not a stable impairment but shows ADHD-sensitive improvement under certain conditions, such as those with rewards. The state regulation theory proposed that the RTV difference score, which captures change from baseline to a rewarded or fast condition, specifically measures ‘state regulation’. By contrast, the interpretation of RTV baseline (slow, unrewarded) scores is debated. We aimed to investigate directly…
Harsh times: do stressors lead to labor market losses?
2018
This paper examines the links between stressful life events and labor market outcomes. We use twin data for Finnish men and women combined with register-based individual information on earnings, employment and social income transfers. The twin data allow us to account for shared environmental and genetic confounders. We measure the exposure to stressful life events in 1990. The labor market outcomes are measured during a 20-year follow-up over the period 1990–2009. Three findings stand out. First, stressors lead to worse labor market outcomes. Second, both men and women are distressed by labor market shocks, but they respond differently to marital problems and health shocks within the famil…
Residence time distribution of solid particles in a continuous, high-aspect-ratio multiple-impeller stirred vessel
2004
Abstract In this paper experimental information on the retention time distribution (RTD) of solid particles in a high-aspect-ratio vessel, stirred by three equally spaced Rushton turbines, is presented. The relevant data were obtained by a special technique named twin system approach (TSA) that greatly simplifies the handling of particle-laden streams and is therefore particularly suited for investigating particle RTD in flow systems. The technique fundamentals are first summarized, together with the data analysis procedure. This lastly requires a numerical deconvolution operation that is easily performed with the help of Z -transforms. Two different approaches for excluding the spurious co…
Romania’s SMEs on the Way to EU’s Twin Transition to Digitalization and Sustainability
2021
Abstract European Commission’s six priorities for 2019-2024 are all in line with and leverage each other to support Europe’s twin transition to digitalization and sustainability; aiming to address the challenges posed by the COVID-19 pandemic, The Recovery Plan for Europe adds resilience as key dimension of EU’s progress, while reinforcing its commitment to the green and digital transformation. Counting for more than 99% of the enterprises, employing about two of three people, and generating more than a half of the value added - with similar weights as concerns Romania - EU’s SMEs are the engine of Europe's economy, therefore essential contributors to these transformative processes - as emp…
Pacemaker therapy in premature children with high degree AV block.
1998
The smallest pacemaker pulse generator and a steroid-eluting bipolar epicardial lead were implanted in two premature children with symptomatic AV block. Stable capture threshold and high amplitude evoked response electrogram resulted in normal function of the pacemaker Autocapture algorithm, which adjusts output 0.3 V above the measured capture threshold. Autocapture had previously been used only with endocardial leads. Longer-term observation is required.