Results 121 to 130 of about 18,543 (271)

Effect of hypoxia on muscle activation at equivalent absolute and relative intensity during incremental and constant load exercise to task failure

Experimental Physiology, EarlyView.
Abstract We examined the impact of moderate hypoxia (HYPO) on muscle activation during incremental exercise matched for both absolute and equivalent relative intensity. Fifteen active subjects (10 males, 5 females) completed two ramp incremental test and two step tests in normoxia (NORM; FiO2${F_{{\mathrm{i}}{{\mathrm{O}}_2}}}$ = 0.209) and HYPO (FiO2${
Dania Ibrahim, Youmna Elsayed Hassanein, Nathan E. Townsend   +2 more
wiley   +1 more source

Comparative Numerical Studies for the Flow Energy Dissipation Features in a Vertical Two‐Stage Centrifugal Pump in Pump and Turbine Conditions

Energy Science & Engineering
The vertical two‐stage centrifugal pump (VTSP) is well‐suited for small pumped storage power stations with high head and low discharge, such as those found in underground mines.
S. Liu, T. P. Chen, Y. Li, M. Q. Liang, Y. J. Zhang, X. Z. Wei   +5 more
doaj   +1 more source

Reverse engineering of pump as turbine for CFD analysis

Acta Polytechnica
Reverse engineering (RE) using 3D scanning is already a relatively technologically simple and cost-effective method. For water turbines, this is particularly true for RE of larger machines. With microturbines, there is a lot of pressure to minimise costs, even at the cost of reduced accuracy. Using an existing micro-PAT (Pump as Turbine) as an example,
Jiří Souček, Eva Bílková, Petr Nowak   +2 more
openaire   +2 more sources

The Effects of Post‐Activation Performance Enhancement on High Intensity Interval Training: A Comparison of Traditional and Cluster Set Protocols

European Journal of Sport Science, Volume 26, Issue 4, April 2026.
ABSTRACT The present study aimed to examine the effects of post‐activation performance enhancement (PAPE) protocols employing half‐squat exercises, performed using either a traditional set (PAPEtraditionalset) or a cluster set (PAPEclusterset), on peak oxygen uptake (V˙ $\dot{\mathrm{V}}$O2peak), the time spent at ≥ 90% maximal oxygen uptake (V˙ $\dot{\
Merve Cin, Özcan Saygın, Refik Çabuk
wiley   +1 more source

Free‐Breathing, 3D Cardiac Magnetic Resonance Elastography for Myocardial Stiffness Mapping

Magnetic Resonance in Medicine, Volume 95, Issue 4, Page 2356-2369, April 2026.
ABSTRACT Purpose Magnetic resonance elastography (MRE) of the heart has predominantly utilized breath‐held acquisitions with limited anatomic coverage. This work investigates the feasibility of 3D, free‐breathing cardiac MRE. Methods A 3D hybrid radial and EPI acquisition is utilized and combined with retrospective binning of k‐space via physiologic ...
Nolan K. Meyer, Yi Sui, Jessica Magnuson, Phillip J. Rossman, Kevin J. Glaser, Matthew C. Murphy, Armando Manduca, Ian C. Chang, Kiaran P. McGee, Kejal Kantarci, Ekta Kapoor, Philip A. Araoz, Richard L. Ehman, Joshua D. Trzasko, Arvin Arani   +14 more
wiley   +1 more source

Monitoring Near‐Surface Changes Using Anthropogenic Seismic Vibrations

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract The abundance of anthropogenic seismic noise provides a valuable resource for monitoring dynamic subsurface property changes. We utilize railway and wind turbine‐induced vibrations recorded by a geophone array to estimate surface wave attenuation and velocity in the underlying glacial deposits of Illinois.
Sayan Mukherjee, Yunyue Elita Li, Andrew Stumpf, Heng Zhang   +3 more
wiley   +1 more source

Water‐Borne Erosion of Reinforced Polymer Composites: Application to Shallow Offshore Marine Environment

Polymer Composites, Volume 47, Issue 5, Page 4102-4126, 10 March 2026.
Comparison of experimental and model‐predicted erosion rates for carbon fibre‐reinforced polymer (CFRP) and glass fibre‐reinforced polymer (GFRP) under low‐velocity (2 m/s) and at varying angles and sand concentrations (0.0, 0.05, 0.4 g/L). The results demonstrate good agreement between experimental data and model predictions across different erosive ...
Ali Al‐Darraji, Christopher Lagat, Thaneshan Sapanathan, Peter Butt, Ibukun Oluwoye   +4 more
wiley   +1 more source

Achieving Net‐Zero in the Electricity Sector in China by 2050 Considering Environmental and Economic Objectives

Advanced Sustainable Systems, Volume 10, Issue 3, March 2026.
China's pathways to net‐zero electricity by 2050 are evaluated using life cycle environmental and economic assessment across six scenarios. Results show that a renewables‐only grid offers the best overall environmental performance and lowest cost, but increases burdens on metal depletion, land use, and ecotoxicity.
Tingfeng Song, Harish K. Jeswani, Adisa Azapagic   +2 more
wiley   +1 more source

Towards Climate Neutrality by 2050: Role of Aluminum for Short‐ and Long‐Term Energy and Hydrogen Storage

Advanced Energy Materials, Volume 16, Issue 10, 11 March 2026.
The Aluminum energy storage cycle involves the use of renewable energy for Al production and the generation of heat (dry cycle) and heat and H2 (wet cycle) for energy production via Al‐steam combustion. ABSTRACT Reaching climate neutrality by 2050 requires innovative long‐term energy storage (LTES) solutions beyond the current use of fossil fuels ...
Lorenzo Trombetti, Stefano Passerini, Linda Barelli   +2 more
wiley   +1 more source

The Future of Hydrogen‐Powered Aviation: Technologies, Challenges, and a Strategic Roadmap for Sustainable Decarbonization

Advanced Energy and Sustainability Research, Volume 7, Issue 3, March 2026.
Hydrogen‐powered aviation offers a transformative pathway to zero‐emission flight by eliminating in‐flight CO2 emissions. Key considerations include propulsion systems (fuel cells and hydrogen combustion), cryogenic storage and insulation challenges, infrastructure and cost barriers, and supply‐chain constraints.
Mubasshira, Md Mahbubur Rahman, Karib Hassan Khan, Md Nizam Uddin, Dewan Hafiz Nabil   +4 more
wiley   +1 more source