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Perceived community environment and depressive symptoms among older adults in China: a cross-sectional analysis of physical activity as a moderator

Zhijia Du, Junyue Yue, Zirui Lin, Xiaoyu Han • Frontiers in Psychology (2026)

IntroductionPerceived community environment is an important contextual factor related to depressive symptoms in later life. However, few studies have examined whether physical activity (PA), a modifiable behavioral factor, moderates this as...

DOAJ Open Access (DOAJ) DOI: 10.3389/fpsyg.2026.1893833

Roles of loneliness and life satisfaction in the relationship between perceived friend social support, positive feelings about the future and loss of motivation

Yavuz Aslan, Orhan Koçak, Aysel Basmacı Kaya, Abdulmohsen Mohammed Abdullah Alkhulayfi et al. • Acta Psychologica (2025)

Purpose: University students often face psychological challenges, particularly loneliness and hopelessness, which are exacerbated by factors such as limited social interactions, economic uncertainty, lack of employment opportunities, and th...

DOAJ Open Access (DOAJ) DOI: 10.1016/j.actpsy.2025.105315

Driving sustainable consumption: how social influence, brand image, and perceived quality shape Thai Gen Z’s purchase intentions

Sarinya L. Suttharattanagul, Nisit Manotungvorapun • Frontiers in Sustainability (2026)

In recent years, sustainability has been receiving attention across various academic disciplines and businesses, particularly in consumer behavior. However, limited studies employ the sociological perspective and brand image to understand h...

DOAJ Open Access (DOAJ) DOI: 10.3389/frsus.2025.1716245

Finite choice, convex choice and finding roots

Stéphane Le Roux, Arno Pauly • Logical Methods in Computer Science (2015)

We investigate choice principles in the Weihrauch lattice for finite sets on the one hand, and convex sets on the other hand. Increasing cardinality and increasing dimension both correspond to increasing Weihrauch degrees. Moreover, we demo...

DOAJ Open Access (DOAJ) DOI: 10.2168/LMCS-11(4:6)2015

Philosophy of Mathematics

• Cambridge University Press eBooks (1984)

The twentieth century has witnessed an unprecedented 'crisis in the foundations of mathematics', featuring a world-famous paradox (Russell's Paradox), a challenge to 'classical' mathematics from a world-famous mathematician (the 'mathematic...

OPENALEX DOI: https://doi.org/10.1017/cbo9781139171519

Mathematics and Gender

Elizabeth H. Fennema, Gilah C. Leder (1990)

This edited collection describes how the Autonomous Learning Behaviours (ALB) model, formulated by Fennema and Peterson, specifically relates to gender differences in mathematics education, learning and performance. The book provides a back...

OPENALEX

Weight-perception-based fixed and variable admittance control algorithms for unimanual and bimanual lifting of objects with a power assist robotic system

S M Mizanoor Rahman, Ryojun Ikeura • International Journal of Advanced Robotic Systems (2018)

Weight-perception-based fixed admittance control algorithm and variable admittance control algorithm are proposed for unimanual and bimanual lifting of objects with a power assist robotic system. To include weight perception in controls, th...

DOAJ Open Access (DOAJ) DOI: 10.1177/1729881416678131

BIOECOLOGÍA DE Telenomus podisi (ASHMEAD) Y Trissolcus basalis (WOLLASTON) (HIMENOPTERA: SCELIONIDAE), PARASITOIDES ÓOFAGOS DE Oebalus insularis (KULGHAST) (HETEROPTERA: PENTATOMIDAE)

Bruno Zachrisson, Onesio Martinez • Tecnociencia (2011)

  Se realizaron estudios bioecológicos de laboratorio y de campo para las localidades de Río Hato (Provincia de Coclé, Panamá), Chepo (Provincia de Panamá, Panamá). Se determinó la tasa de parasitismo de Trissolcus basalis y Telenomus podis...

DOAJ Open Access (DOAJ)

Problem-Based Tasks in Mathematics Learning: Opportunities and Challenges for Teachers

Sri Suryanti, Toto Nusantara, I Nengah Parta, Santi Irawati • JTAM (Jurnal Teori dan Aplikasi Matematika) (2023)

Mathematics education and teaching should not only include routine tasks; but tasks that need practice and memorization are mathematically more prosperous and more difficult because they promote problem-solving, investigation, and the disco...

DOAJ Open Access (DOAJ) DOI: 10.31764/jtam.v7i2.12864

Semi-Analytical Option Pricing Under Double Heston Jump-Diffusion Hybrid Model

Rehez Ahlip, Laurence A. F. Park, Ante Prodan • Journal of Mathematical Sciences and Modelling (2018)

We examine European call options in the jump-diffusion version of the Double Heston stochastic volatility model for the underlying price process to provide a more flexible model for the term structure of volatility. We assume, in addition, ...

DOAJ Open Access (DOAJ) DOI: 10.33187/jmsm.432019

Lower Bounds for Dynamic Programming on Planar Graphs of Bounded Cutwidth

Bas van Geffen, Bart Jansen, Arnoud de Kroon, Rolf Morel • Journal of Graph Algorithms and Applications (2020)

Many combinatorial problems can be solved in time $\mathcal{O}^*(c^{\mathrm{tw}})$ on graphs of treewidth $\mathrm{tw}$, for a problem-specific constant $c$. In several cases, matching upper and lower bounds on $c$ are known based on the St...

DOAJ Open Access (DOAJ) DOI: 10.7155/jgaa.00542

Investigating late-time cosmology using Finsler-Randers geometry and Barthel connection: Observational constraints and implications

J. Praveen, S.K. Narasimhamurthy • Nuclear Physics B (2025)

In this study we explore cosmological anisotropies and dark energy using Finsler-Randers geometry, an extension of Riemannian geometry that incorporates directional dependence in the spacetime structure. We investigate whether Finslerian mo...

DOAJ Open Access (DOAJ) DOI: 10.1016/j.nuclphysb.2025.116899

Mathematical modeling of the COVID-19 pandemic with intervention strategies

Subhas Khajanchi, Kankan Sarkar, Jayanta Mondal, Kottakkaran Sooppy Nisar et al. • Results in Physics (2021)

Mathematical modeling plays an important role to better understand the disease dynamics and designing strategies to manage quickly spreading infectious diseases in lack of an effective vaccine or specific antivirals. During this period, for...

DOAJ Open Access (DOAJ) DOI: 10.1016/j.rinp.2021.104285

Numerical Modal Analysis of Vibrations in a Three-Phase Linear Switched Reluctance Actuator

José Salvado, Maria do Rosário Calado, António Espírito Santo, Anna Guerman • Modelling and Simulation in Engineering (2017)

This paper addresses the problem of vibrations produced by switched reluctance actuators, focusing on the linear configuration of this type of machines, aiming at its characterization regarding the structural vibrations. The complexity of t...

DOAJ Open Access (DOAJ) DOI: 10.1155/2017/3258376

The causal ordering of mathematics anxiety and mathematics achievement: a longitudinal panel analysis

Xin Ma, Jiangming Xu • Journal of Adolescence (2003)

Using data from the Longitudinal Study of American Youth (LSAY), we aimed to determine the causal ordering between mathematics anxiety and mathematics achievement. Results of structural equation modelling showed that, across the entire juni...

OPENALEX DOI: https://doi.org/10.1016/j.adolescence.2003.11.003