Results 81 to 90 of about 26,846 (287)

On the Lightweight Potential of Laser Additive Manufactured NiTi Triply Periodic Minimal Sheet Lattices

Advanced Engineering Materials, EarlyView.
This study explores the lightweight potential of laser additive‐manufactured NiTi triply periodic minimal surface sheet lattices. It systematically investigates the effects of relative density and unit cell size on surface quality, deformation recovery, compression behavior, and energy absorption.
Haoming Mo, Shuo Qu, Shiming Gao, Xu Song   +3 more
wiley   +1 more source

A Numerical–Experimental Approach for Multi‐Matrix Fiber‐Reinforced Plastics Characterization Using Finite Element Model Updating

Advanced Engineering Materials, EarlyView.
A numerical–experimental framework is developed for characterizing multi‐matrix fiber‐reinforced polymers (MM‐FRPs) combining epoxy and polyurethane matrices. Harmonic bending tests are integrated with finite element model updating (FEMU) to simultaneously identify elastic and viscoelastic material parameters.
Rodrigo M. Dartora, Tales V. Lisbôa, Axel Spickenheuer, Rogério J. Marczak, Jakson M. Vassoler   +4 more
wiley   +1 more source

COMPARISON OF HEART RATE VARIABILITY IN NEGATIVE AND POSITIVE RESPONDERS TO ACTIVE PHASE OF HEAD-UP TILT TEST

Pakistan Armed Forces Medical Journal, 2018
Objective: To compare heart rate variability in negative and positive responders to active phase of head-up tilt test. Study Design:Cross-sectional comparative study.
Sara Naeem, Hira Ashraf, Azmat Hayat, Muhammad Alamgir Khan   +3 more
doaj  

A New Approach to the Etiology of Syncope: Infection as a Cause

Viruses
Background/Objectives: Syncope is a common clinical occurrence, with neurally mediated and orthostatic types accounting for about 75% of cases. The exact pathophysiological mechanisms remain unclear, with recent evidence suggesting autonomic nervous ...
Branislav Milovanovic, Nikola Markovic, Masa Petrovic, Vasko Zugic, Milijana Ostojic, Milica Dragicevic-Antonic, Milovan Bojic   +6 more
doaj   +1 more source

Is there any link between vitamin D deficiency and vasovagal syncope?

Journal of Arrhythmia, 2020
Background This study aimed to investigate serum 25[OH]D levels between patients with vasovagal syncope (VVS) diagnosed with head‐up tilt table test (HUTT) and age‐matched healthy people.
Songül Usalp, Hatice Kemal, Ümit Yüksek, Belma Yaman, Aziz Günsel, Oğuzhan Edebal, Onur Akpınar, Levent Cerit, Hamza Duygu   +8 more
doaj   +1 more source

Dependence of Atrial Fibrillatory Rate Variations Induced by Head-Up/Down Tilt-Test on Autonomic Action

, 2023
In atrial fibrillation (AF), autonomic nervous system (ANS) differences among individuals may have a substantial influence on the varying effectiveness of anti-AF treatments. This work aimed to assess the relationship between changes in autonomic balance
Celotto, Chiara, Abdollahpur, Mostafa, Sandberg, Frida,, Laguna, Pablo, Celotto, Chiara,, Pueyo, Esther,, Sanchez, Carlos, Abdollahpur, Mostafa,, Sanchez, Carlos,, Sandberg, Frida, Lund University., Pueyo, Esther, Laguna, Pablo,   +12 more
core   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Impaired cerebral oxygenation in heart failure patients at rest and during head‐up tilt testing

ESC Heart Failure, 2021
Aims Heart failure (HF) confers potentially negative effects on the brain and autonomic nervous system. The measurement cerebral tissue oxygen saturation (SctO2) may aid in understanding such effects.
Isabella Kharraziha, Hannes Holm, Martin Magnusson, Per Wollmer, John Molvin, Amra Jujic, Artur Fedorowski, Erasmus Bachus, Viktor Hamrefors   +8 more
doaj   +1 more source

Additive Manufacturing of Continuous Fibre Reinforced Composites: Process, Characterisation, Modelling, and Sustainability

Advanced Engineering Materials, EarlyView.
Additive manufacturing provides precise control over the placement of continuous fibres within polymer matrices, enabling customised mechanical performance in composite components. This article explores processing strategies, mechanical testing, and modelling approaches for additive manufactured continuous fibre‐reinforced composites.
Cherian Thomas, Amir Hosein Sakhaei
wiley   +1 more source

Head-up tilt lowers IOP and improves RGC dysfunction in glaucomatous DBA/2J mice

, 2010
The inbred DBA/2J (D2) mouse strain is a well established model of spontaneously elevated intraocular pressure (IOP), progressive glaucomatous loss of retinal ganglion cells (RGCs), and early damage of RGC axons at the level of optic nerve head.
Porciatti, Vittorio, Nagaraju, Mahesh
core   +1 more source