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Design of Mechanics-Guided Helmet Pad and Its Protection Performance Against the Blast Shock Waves.
Int J Numer Method Biomed Eng
December 2024
Department of Engineering Mechanics, Dalian University of Technology, Dalian, China.
Article Synopsis
- Current military helmets do not provide adequate protection against blast shock waves, posing a risk to soldiers in combat.
- New helmet pads are being designed based on oblique reflection theory (ORT) to enhance blast protection and are compared with existing combat helmet pads.
- The study shows that ORT-guided helmet pads significantly reduce internal overpressure and intracranial pressure, ultimately lowering the risk of traumatic brain injuries from explosions.
Development of a Combat-Relevant Murine Model of Wound Mucormycosis: A Platform for the Pre-Clinical Investigation of Novel Therapeutics for Wound-Invasive Fungal Diseases.
J Fungi (Basel)
May 2024
Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA.
Wound-invasive fungal diseases (WIFDs), especially mucormycosis, have emerged as life-threatening infections during recent military combat operations. Many combat-relevant fungal pathogens are refractory to current antifungal therapy. Therefore, animal models of WIFDs are urgently needed to investigate new therapeutic solutions.
View Article and Find Full Text PDFLow-Pressure Pancake Bouncing on Superhydrophobic Surfaces.
Small
August 2024
School of Aeronautic Science and Engineering, Beihang University, Beijing, 100191, China.
A new form of pancake bouncing is discovered in this work when a droplet impacts onto micro-structured superhydrophobic surfaces in an environment pressure less than 2 kPa, and an unprecedented reduction of contact time by ≈85% is obtained. The mechanisms of forming this unique phenomenon are examined by combining experimental observation, numeical modelling and an improved theoretical model for the overpressure effect arising from the vaporisation inside micro-scaled structures. The competition among the vapor overpressure effect, the droplet impact force, and the surface adhesion determines if the pancake bouncing behavior could occur.
View Article and Find Full Text PDFAssessment of brain response in operators subject to recoil force from firing long-range rifles.
Front Bioeng Biotechnol
February 2024
Department of Mechanical Engineering, University of Waterloo, Waterloo, ON, Canada.
Mild traumatic brain injury (mTBI) may be caused by occupational hazards military personnel encounter, such as falls, shocks, exposure to blast overpressure events, and recoil from weapon firing. While it is important to protect against injurious head impacts, the repeated exposure of Canadian Armed Forces (CAF) service members to sub-concussive events during the course of their service may lead to a significant reduction in quality of life. Symptoms may include headaches, difficulty concentrating, and noise sensitivity, impacting how personnel complete their duties and causing chronic health issues.
View Article and Find Full Text PDFMeasurements of the Effective Stress Coefficient for Elastic Moduli of Sandstone in Quasi-Static Regime Using Semiconductor Strain Gauges.
Sensors (Basel)
February 2024
Centre for Exploration Geophysics, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
Numerous experimental and theoretical studies undertaken to determine the effective stress coefficient for seismic velocities in rocks stem from the importance of this geomechanical parameter both for monitoring changes in rock saturation and pore pressure distribution in connection with reservoir production, and for overpressure prediction in reservoirs and formations from seismic data. The present work pursues a task to determine, in the framework of a low-frequency laboratory study, the dependence of the elastic moduli of n-decane-saturated sandstone on the relationship between pore and confining pressures. The study was conducted on a sandstone sample with high quartz and notable clay content in a quasi-static regime when a 100 mL tank filled with n-decane was directly connected to the pore space of the sample.
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