CRIS

Permanent URI for this communityhttps://scripta.up.edu.mx/handle/20.500.12552/1

Browse

Search Results

Now showing 1 - 7 of 7

Some of the metrics are blocked by your
consent settings
Benchmark of Wrist-Wearable Devices for Student Stress Monitoring
(Springer Nature Switzerland, 2025)
Mena-Martinez, Alma
;
Alvarado-Uribe, Joanna
;
Garcia-Ceja, Enrique
;
;
Escamilla-Ambrosio, Ponciano Jorge
This study presents a comparative analysis of various activity wristbands to evaluate their suitability as a tool for collecting human activity among university students. The research examines key factors such as battery life, data extraction methods, file formats, integrated sensors, and developer support. The results reveal significant differences in device capabilities, with the Garmin Venu 3 offering the most comprehensive sensor suite but at a high cost, while the Fitbit Inspire 3 provides a cost-effective alternative with essential monitoring features. The study highlights the importance of compatibility with data processing tools and the ability to extract information efficiently for research applications. These insights contribute to the selection of suitable wearable devices for academic studies. ©The authors ©Springer.
Some of the metrics are blocked by your
consent settings
Association between coping of the primary caregiver and the adolescent patient with cancer
(Springer Science and Business Media, 2025)
Villanueva Leonel, Jaramillo
;
Rendón-Macías, Mario Enrique
;
Ríos Covian, Ana
Background: Coping mechanisms help individuals face adversity, remain stable over time, and can be generalized to various circumstances. Two types are typically distinguished: the active style, aimed at resolving problems, and the passive style, focused on emotional regulation. We hypothesized that passive coping of the primary caregiver (hereafter, primary caregiver [PC]) would affect the adaptive coping of his or her adolescent child with cancer (hereafter, adolescent with cancer [AC]). Objective: To analyze coping styles in adolescents with cancer (ACs) and their primary caregivers (PCs). Materials and methods: This was an analytical cross-sectional study including 116 pairs of an adolescent with cancer (AC) and a primary caregiver (PC). The adolescents completed the Adolescent Coping Scale (ACS), applicable to those aged 9–17 years, while the caregivers completed the Coping Strategies Inventory (CSI). Results: 49% (57/116) of the pairs both used the active coping style, and 14% showed the passive style in both members. No agreement was found between the coping styles of the AC and PC (Kappa = 0.15, 95% confidence interval [CI]: 0.13–0.14, p = 0.13). The multivariate analysis explained 61% of the variance (Nagelkerke pseudo R2 = 0.61; likelihood ratio = 191.4; p = 0.003). Conclusions: Passive coping by the primary caregiver occurred with low frequency, and active coping was favored, similar to that of the adolescent with cancer. ©The authors ©Springer Science and Business Media © BMC Primary Care.
Some of the metrics are blocked by your
consent settings
Numerical Analysis of Machining Part Distortion in Aircraft Aluminum Structures
(ASME, 2020)
Ledesma-Orozco, Elías
;
The inherent residual stresses in the raw materials of large monolithic structural components whereby machining procedures are needed to produce aircraft components, cause deviations, and distortions that are undesired and rise challenges for engineering design and engineering production teams of the aerospace companies. A numerical approach to address part distortion is proposed in this paper. An algorithm was developed and implemented as a finite element subroutine in the software ANSYS APDL, which uses the raw inherent residual stress parameters of the aluminum alloy and the machining locations of a structural specimen to simulate the machining distortion phenomenon in aircraft aluminum structures. This algorithm uses as inputs the finite element mesh of a component, the coefficients of residual stresses functions, and the machining location parameters from where a part is made of a raw material blank. The numerical results predicted the part distortion phenomenon with an Absolute Error of 2.79% with respect to initial experimental measurements of part distortion. Additionally, the proposed approach was used to develop part distortion curves by considering the machining location of the specimen. From these, numerical optimization techniques led to determine the machining location of the representative specimen that attained lower distortions. Such location corresponded to a vertical value around of 3.15 mm for the two simulated residual stresses conditions in the material. An additional measurement was carried out to validate the optimal numerical results and errors below 3% were obtained. Consequently, the proposed approach can be of use to determine, to reduce and to optimize part distortion without further experimental testing in structural aluminum 7050-T7451 alloy aircraft components.
14 1
Some of the metrics are blocked by your
consent settings
Modeling Nonlinear Compressive Stress Responses in Closed-Cell Polymer Foams Using Artificial Neural Networks: A Comprehensive Case Study
(ACS Publications, 2022-06-14)
Closed-cell polymer foams are versatile materials that have multiple applications in several industries due to their mechanical energy absorption capabilities, and they are used to design protective devices as engineering solutions or to produce packaging solutions to protect goods. Because most of these products and devices operate in compression, it is necessary to know the material behavior to compressive loadings for modeling and design purposes. In this work, the compressive response of a closed-cell expanded polypropylene polymer foam is modeled using feed-forward artificial neural network models as a case study. Practical considerations and a methodology that includes the basic steps to conduct the modeling of the compressive stress of foams of this class are presented. The modeling uses foam densities, loading rates, and strain as inputs in an artificial neural network system to model compressive stress in the foam. Results help conclude that feed-forward neural networks can model the response at compression for expanded polypropylene foams considering different variables since prediction errors close to the unity of the coefficient of determination R2 and error results below 2% regarding testing data were obtained.
Scopus© Citations 3 9
Some of the metrics are blocked by your
consent settings
Salesperson turnover intention: a tale of two countries
(Emerald Publishing Limited, 2021)
Onyemah, Vincent
;
Mulki, Jay P.
;
Rivera-Pesquera, Martha
Purpose: A significant amount of research has shown that drivers of employee attitudes, and behaviors leading to outcome variables such as turnover intentions, are strongly influenced by national culture. This study focuses on the difference in relationships among some critical variables between two emerging economies with similar cultural indices. Design/methodology/approach: Survey questionnaire was used to collect responses from salespeople in two countries. Correlation analysis and structural equation modeling were used to provide support for the stated hypotheses. Publisher: Emerald Publishing Limited Copyright © 2021, Emerald Publishing Limited
Scopus© Citations 3 17 1
Some of the metrics are blocked by your
consent settings
The stress granule RNA-binding protein TIAR-1 protects female germ cells from heat shock in Caenorhabditis elegans
(2016)
Huelgas-Morales, Gabriela
;
Salinas, Laura S.
;
Greenstein, David
;
Navarro, Rosa E.
In response to stressful conditions, eukaryotic cells launch an arsenal of regulatory programs to protect the proteome. One major protective response involves the arrest of protein translation and the formation of stress granules, cytoplasmic ribonucleoprotein complexes containing the conserved RNA-binding proteins TIA-1 and TIAR. The stress granule response is thought to preserve mRNA for translation when conditions improve. For cells of the germline-the immortal cell lineage required for sexual reproduction-protection from stress is critically important for perpetuation of the species, yet how stress granule regulatory mechanisms are deployed in animal reproduction is incompletely understood. Here, we show that the stress granule protein TIAR-1 protects the Caenorhabditis elegans germline from the adverse effects of heat shock. Animals containing strong loss-of-function mutations in tiar-1 exhibit significantly reduced fertility compared to the wild type following heat shock. Analysis of a heat-shock protein promoter indicates that tiar-1 mutants display an impaired heat-shock response. We observed that TIAR-1 was associated with granules in the gonad core and oocytes during several stressful conditions. Both gonad core and oocyte granules are dynamic structures that depend on translation; protein synthesis inhibitors altered their formation. Nonetheless, tiar-1 was required for the formation of gonad core granules only. Interestingly, the gonad core granules did not seem to be needed for the germ cells to develop viable embryos after heat shock. This suggests that TIAR-1 is able to protect the germline from heat stress independently of these structures. © 2016 Huelgas-Morales et al.
Scopus© Citations 28 9 1
Some of the metrics are blocked by your
consent settings
Mindfulness affects stress, ghrelin, and BMI of obese children: a clinical trial
(2020)
López-Alarcón, Mardia
;
Zurita-Cruz, Jessie N.
;
Torres-Rodríguez, Alonso
;
Bedia-Mejía, Karla
;
Pérez-Güemez , Manuel
Childhood obesity is associated with stress. However, most treatment strategies include only dietary and physical activity approaches. Mindfulness may assist in weight reduction, but its effectiveness is unclear. We assessed the effect of mindfulness on stress, appetite regulators, and weight of children with obesity and anxiety. A clinical study was conducted in a pediatric hospital. Eligible children were 10–14 years old, BMI ≥95th percentile, Spence anxiety score ≥55, and who were not taking any medication or supplementation. Participants were assigned to receive an 8-week conventional nutritional intervention (CNI) or an 8-week mindfulness-based intervention plus CNI (MND-CNI). Anthropometry, body composition, leptin, insulin, ghrelin, cortisol, and Spence scores were measured at baseline and at the end of the intervention. Anthropometry was analyzed again 8 weeks after concluding interventions. Log-transformed and delta values were calculated for analysis. Thirty-three MND-CNI and 12 CNI children finished interventions; 17 MND-CNI children accomplished 16 weeks. At the end of the intervention, significant reductions in anxiety score (−6.21 ± 1.10), BMI (−0.45 ± 1.2 kg/m2), body fat (−1.28 ± 0.25%), ghrelin (−0.71 ± 0.37 pg/mL), and serum cortisol (−1.42 ± 0.94 µg/dL) were observed in MND-CNI children. Changes in anxiety score, ghrelin, and cortisol were different between groups (P < 0.05). Children who completed 16 weeks decreased BMI after intervention (−0.944 ± 0.20 kg/m2, P < 0.001) and remained lower 8 weeks later (−0.706 ± 0.19 kg/m2, P = 0.001). We concluded that mindfulness is a promising tool as an adjunctive therapy for childhood obesity. However, our findings need confirmation in a larger sample population. © 2020 The authors.Endocrine Connections, BioScientifica Ltd.
Scopus© Citations 14 12 1

CRIS

Browse

Filters

Settings

Sort By

Results per page

Search Results