12 results on '"Uriarte, C."'
Search Results
2. Levitating frogs, machine learning and elliptic integrals
- Author
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Arrayás, M., Trueba, J. L., and Uriarte, C.
- Subjects
Physics - Computational Physics - Abstract
We present the calculation of the stability region of a perfect diamagnet levitated in a magnetic field created by a circular current loop. We make use of the machine learning technique of automatic differentiation to illustrate the calculations with the elliptic integrals involved.
- Published
- 2021
3. A Deep Double Ritz Method (D2RM) for solving Partial Differential Equations using Neural Networks
- Author
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Uriarte, C., Pardo, D., Muga, I., Muñoz-Matute, J., and European Commission
- Subjects
FOS: Computer and information sciences ,variational formulation ,Computer Science - Machine Learning ,residual minimization ,optimal test functions ,FOS: Mathematics ,partial differential equations ,Numerical Analysis (math.NA) ,Mathematics - Numerical Analysis ,neural networks ,Ritz method ,Machine Learning (cs.LG) - Abstract
Residual minimization is a widely used technique for solving Partial Differential Equations in variational form. It minimizes the dual norm of the residual, which naturally yields a saddle-point (min-max) problem over the so-called trial and test spaces. In the context of neural networks, we can address this min-max approach by employing one network to seek the trial minimum, while another network seeks the test maximizers. However, the resulting method is numerically unstable as we approach the trial solution. To overcome this, we reformulate the residual minimization as an equivalent minimization of a Ritz functional fed by optimal test functions computed from another Ritz functional minimization. We call the resulting scheme the Deep Double Ritz Method (D$^2$RM), which combines two neural networks for approximating trial functions and optimal test functions along a nested double Ritz minimization strategy. Numerical results on different diffusion and convection problems support the robustness of our method, up to the approximation properties of the networks and the training capacity of the optimizers., 28 pages
- Published
- 2023
4. Intelligente Förderzellen für flexible Materialflusssysteme – Eine Zelle für alle Aufgaben
- Author
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Thamer, H., primary, Uriarte, C., additional, and Benggolo, A. Y., additional
- Published
- 2018
- Full Text
- View/download PDF
5. Celluveyor – Zellulare Fördertechnik für hochflexible Materialflusssysteme
- Author
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Thamer, H., primary, Uriarte, C., additional, and Freitag, M., additional
- Published
- 2016
- Full Text
- View/download PDF
6. Levitating frogs, machine learning and elliptic integrals
- Author
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Array��s, M., Trueba, J. L., and Uriarte, C.
- Subjects
Physics::Plasma Physics ,Condensed Matter::Superconductivity ,FOS: Physical sciences ,Computational Physics (physics.comp-ph) ,Physics - Computational Physics - Abstract
We present the calculation of the stability region of a perfect diamagnet levitated in a magnetic field created by a circular current loop. We make use of the machine learning technique of automatic differentiation to illustrate the calculations with the elliptic integrals involved.
- Published
- 2021
7. EL JUEGO DE PELOTA EN TEOTIHUACAN.
- Author
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Uriarte C., María Teresa
- Subjects
- *
PELOTA (Latin American game) , *BALL games , *INDIGENOUS peoples of the Americas -- Games - Abstract
El artículo discurre sobre los juegos de pelota en las civilizaciones indígenas en Teotihuacan, México.
- Published
- 2017
8. Youth attention, perceptions, and appeal in response to e-cigarette advertising features: A focus group study.
- Author
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Jeong M, Weiger C, Uriarte C, Wackowski OA, and Delnevo CD
- Abstract
Background: E-cigarette marketing exposure may influence vaping-related outcomes among youth, but less is known on which specific advertising features impact youth attention, perceptions, and appeal. This study qualitatively examines responses to different e-cigarette advertising features among e-cigarette-naïve youth., Methods: We conducted four online focus groups in 2021 with a national U.S. sample of 13-17 year olds (n = 25) who had never used e-cigarettes. Participants viewed and discussed their reactions to different e-cigarette advertisements varying in the inclusion of ad features, including color, models in imagery, text claims targeting smokers, and the nicotine warning label., Results: Participants were attracted to ads with bright colors, particularly when contrasted against a dark background. Ads featuring models attracted attention and reduced perceptions that the product is harmful. Comments indicated mixed reactions to smoker-targeted text claims. On one hand, participants perceived ads with text that specified "for smokers" as targeting older adults. On the other hand, text referring to "switching" from cigarettes to e-cigarettes led to some perceptions that the product is healthy, and certain text that implicitly referred to smoking (e.g., "no odor") had the potential to appeal to youth who wanted to use e-cigarettes discreetly. The level of attention paid to warnings depended on warning size and the color contrast between the warning and the rest of the ad., Conclusions: Findings suggest specific e-cigarette ad features play an important role in attracting youth attention and influencing perceptions. More research is needed on the potential public health benefits versus unintended consequences of smoker-targeted text claims., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 The Authors.)
- Published
- 2024
- Full Text
- View/download PDF
9. Exploring the Influence of E-cigarette Ad Features on Perceived Product Appeal and Use Interest Among Young Adults of Varying Tobacco-Use Behaviors.
- Author
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La Capria K, Uriarte C, Elhabashy M, Menkevich M, Maxton O, Awadalla J, Tan ASL, Moran MB, and Chen-Sankey J
- Subjects
- Humans, Young Adult, Nicotine, Marketing methods, Tobacco Use, Electronic Nicotine Delivery Systems, Tobacco Products
- Abstract
Introduction: Exposure to certain features in commercial e-cigarette ads may influence e-cigarette use perceptions. This study explored the reactions toward common features in e-cigarette ads among young adults of various tobacco-use behaviors., Aims and Methods: We used data from in-depth interviews with U.S. young adults (ages 18-29) who do not use tobacco (n = 26) and who currently smoke cigarettes (n = 26). Participants viewed 30 print e-cigarette ads that included multiple features (eg, fruit flavors, price promotions, smoker-targeted messages) before discussing their perceived influence of memorable ad features. We used reflective thematic analysis to analyze interview data., Results: Participants from both groups generally noticed fruit and multiple flavors displayed in the ads, which were seen as appealing and were reported to generate product-use interest because of bright colors, sensory appeal, and a variety of flavor options. Participants who smoke perceived price promotions and positive experience testimonials to be appealing, and some reported this generated use interest. Participants from both groups perceived smoker-targeted messages to be unconvincing, and reported this dampened ad and product appeal and use interest. Participants who do not use tobacco perceived nicotine warnings to be unappealing, resulting in reduced perceived appeal of other attractive features (eg, fruit flavors) appearing in the same ads., Conclusions: Marketing features appearing in e-cigarette ads may be perceived by young adults of various tobacco-use behaviors in both similar and different ways. Communication and policy strategies that account for these differential perceptions towards various marketing features are needed to reduce the negative impact of e-cigarette marketing., Implications: This study revealed evidence related to young adults' reactions to and perceived influence of commonly used marketing features (eg, fruit flavors, nicotine warnings, price promotions, smoker-targeted messages) in commercial e-cigarette ads. The results highlight the similar and differential perceived appeal and use interest of e-cigarette products promoted with various marketing features among young adults of different tobacco-use behaviors. The results have implications for informing the design of communication strategies and policies related to e-cigarette marketing aimed at promoting complete product switching among young adults who smoke while simultaneously deterring e-cigarette use interest among those who do not use tobacco., (© The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Research on Nicotine and Tobacco. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
- Published
- 2024
- Full Text
- View/download PDF
10. Design of a system for controlling a levitating sphere in superfluid 3 He at extremely low temperatures.
- Author
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Arrayás M, Trueba JL, Uriarte C, and Zmeev DE
- Abstract
We present a new mechanical probe to study the properties of superfluid
3 He at microkelvin temperatures down to 100 μK. The setup consists of a set of coils for levitating a superconducting sphere and controlling its motion in a wide variety of regimes. In particular, the realisation of motion of a levitating body at a uniform velocity presents both an experimental challenge and a promising direction into the study of the edge states in topological superfluid3 He-B. We include the theoretical study of the device stability and simulations to illustrate the capabilities of the control system., (© 2021. The Author(s).)- Published
- 2021
- Full Text
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11. GLP-1 improves adipose tissue glyoxalase activity and capillarization improving insulin sensitivity in type 2 diabetes.
- Author
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Rodrigues T, Borges P, Mar L, Marques D, Albano M, Eickhoff H, Carrêlo C, Almeida B, Pires S, Abrantes M, Martins B, Uriarte C, Botelho F, Gomes P, Silva S, Seiça R, and Matafome P
- Subjects
- Adult, Aged, Animals, Capillaries enzymology, Capillaries physiopathology, Cells, Cultured, Diabetes Mellitus, Type 2 enzymology, Diabetes Mellitus, Type 2 physiopathology, Disease Models, Animal, Female, Gastrectomy, Glucagon-Like Peptide 1 metabolism, Glucagon-Like Peptide-1 Receptor metabolism, Human Umbilical Vein Endothelial Cells drug effects, Human Umbilical Vein Endothelial Cells enzymology, Humans, Male, Middle Aged, Obesity enzymology, Obesity physiopathology, Obesity surgery, Rats, Wistar, Signal Transduction, Adipose Tissue blood supply, Capillaries drug effects, Diabetes Mellitus, Type 2 drug therapy, Glucagon-Like Peptide-1 Receptor agonists, Hypoglycemic Agents pharmacology, Incretins pharmacology, Insulin Resistance, Lactoylglutathione Lyase metabolism, Liraglutide pharmacology, Neovascularization, Physiologic drug effects
- Abstract
Methylglyoxal was shown to impair adipose tissue capillarization and insulin sensitivity in obese models. We hypothesized that glyoxalase-1 (GLO-1) activity could be diminished in the adipose tissue of type 2 diabetic obese patients. Moreover, we assessed whether such activity could be increased by GLP-1-based therapies in order to improve adipose tissue capillarization and insulin sensitivity. GLO-1 activity was assessed in visceral adipose tissue of a cohort of obese patients. The role of GLP-1 in modulating GLO-1 was assessed in type 2 diabetic GK rats submitted to sleeve gastrectomy or Liraglutide treatment, in the adipose tissue angiogenesis assay and in the HUVEC cell line. Glyoxalase-1 activity was decreased in visceral adipose tissue of pre-diabetic and diabetic obese patients, together with other markers of adipose tissue dysfunction and correlated with increased HbA1c levels. Decreased adipose tissue GLO-1 levels in GK rats were increased by sleeve gastrectomy and Liraglutide, being associated with overexpression of angiogenic and vasoactive factors, as well as insulin receptor phosphorylation (Tyr1161). Moreover, GLP-1 increased adipose tissue capillarization and HUVEC proliferation in a glyoxalase-dependent manner. Lower adipose tissue GLO-1 activity was observed in dysmetabolic patients, being a target for GLP-1 in improving adipose tissue capillarization and insulin sensitivity., (Copyright © 2020 Elsevier Ltd. All rights reserved.)
- Published
- 2020
- Full Text
- View/download PDF
12. Mental health and psychosocial support for families of missing persons in Sri Lanka: A retrospective cohort study.
- Author
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Andersen I, Poudyal B, Abeypala A, Uriarte C, and Rossi R
- Abstract
Background: The International Committee of the Red Cross (ICRC) has developed its 'Accompaniment model' to address the multi-faceted needs of relatives of people who go missing during armed conflict. In Sri Lanka an Accompaniment Programme was launched in 2015 for the relatives of the more than 16,000 missing persons who remain unaccounted for., Method: One thousand seven hundred eighty-three relatives who took part in the mental health and psychosocial support (MHPSS) component of the ICRC's Accompaniment Programme in Sri Lanka between April 2016 and August 2017 were offered eight peer-support group sessions, individual home visits, referrals to local services, and commemoration events to pay tribute to their missing relatives. Symptoms of anxiety and depression (using the HADS scale), somatic difficulties (using the BSI scale) and daily functioning (ICRC scale) were assessed before and after the MHPSS intervention., Results: Prior to receiving support, Tamil and Muslim ethnicity, ≥60 years of age and civilian status were predictors of severe symptoms of anxiety; Tamil ethnicity, ≥50 years of age and being the mother of a missing person were predictors of severe symptoms of depression; and ≥ 50 years of age and severe symptoms of anxiety and depression were predictors of severe somatic difficulties. After receiving support, the vast majority of the relatives of missing persons showed reduced levels of anxiety (81%), depression (79%) and somatic pain (77%), as well as increased functioning (75%). Predictors of improvement following support were severe levels of distress at baseline and Tamil and Muslim ethnicity. In addition, attending at least three group sessions was a predictor of decreased anxiety, age group 51-60 was a predictor of decreased depression, female gender was a predictor of decreased somatic difficulties, and referrals were a predictor of increased functioning ., Conclusion: The MHPSS component of the ICRC's Accompaniment Programme is a relevant approach to helping families to cope with not knowing the fate and whereabouts of their missing relatives, to reduce distress, to break their social isolation and to resume more functional lives. However, further research is needed, possibly through a controlled trial, to better establish the effectiveness of this approach., Competing Interests: Competing interestsThe authors report no conflict of interest. The authors alone are responsible for the content and writing of the article. The views expressed are those of the authors and do not necessarily represent the views, policies or decisions of their employers., (© The Author(s) 2020.)
- Published
- 2020
- Full Text
- View/download PDF
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