Results 51 to 60 of about 493,530 (255)

Soft‐Layered Composites with Wrinkling‐Activated Multi‐Linear Elastic Behavior, Stress Mitigation, and Enhanced Strain Energy Storage

Advanced Engineering Materials, EarlyView.
In this study, exciting new bi‐/multi‐linear elastic behavior of soft elastic composites that accompany the activation of wrinkling in the embedded interfacial layers is analyzed. The new features and performance of these composite materials, including dramatic enhancements in energy storage, can be tailored by the concentration of interfacial layers ...
Narges Kaynia, Nicholas Xuanlai Fang, Mary C. Boyce   +2 more
wiley   +1 more source

P wave duration and P dispersion in healthy children

The Turkish Journal of Pediatrics, 2003
To determine the normal values of P wave duration and P dispersion (Pd=maximum P wave duration-minimum P wave duration) in healthy children, electrocardiograms of 232 healthy children (143 boys, 89 girls, aged 7 to 15 years) were examined.
Sedat Köse, Ayhan Kiliç, Atilla Iyisoy, Hürkan Kurşaklioğlu, Mustafa K Lenk   +4 more
doaj  

P wave dispersion and severity of obstructive sleep apnea syndrome

Egyptian Journal of Chest Disease and Tuberculosis, 2014
Background: OSA is associated with an increased prevalence of coronary artery disease, heart failure and rhythm disturbance. Also, P-wave dispersion (Pd) reflects inhomogeneous atrial depolarization secondary to insults such as chronically elevated ...
Mohamed Metwally, Salwa Roshdy, Mohammed Abdel Ghany, Amira Abd El Razik   +3 more
doaj   +1 more source

First‐Principles Modeling of Solid Solution Softening and Hardening Effects in Al–Mg–Zr–Si Aluminum Alloys

Advanced Engineering Materials, EarlyView.
The role of various alloying elements in face‐centered cubic aluminum on the barrier of a Shockley partial dislocation during its motion is presented. The study aims to understand how alloying atoms such as Mg, Si, and Zr affect the energy landscape for dislocation motion, thus influencing the solid solution hardening and softening in aluminum, which ...
Inna Plyushchay, Zhengqing Wei, Nebahat Bulut, Sibylle Gemming   +3 more
wiley   +1 more source

Effect of no-reflow/reflow on P-wave time indexes in patients with acute myocardial infarction undergoing percutaneous coronary intervention

International Journal of the Cardiovascular Academy, 2020
Aim: The aim of this study was to investigate the relationship between no-reflow (no-RF), reflow (RF), and the P-wave time index in patients undergoing percutaneous coronary intervention (PCI) with a diagnosis of acute myocardial infarction (AMI) due to ...
Ahmet Karakurt, Cennet Yildiz, Doğan Iliş   +2 more
doaj   +1 more source

Correlation of Nasal Septum Deviation With the Risk of Cardiac Arrhythmia and the Effect of septoplasty

Advanced Medical Journal, 2023
Background and objectives:Nasal obstruction is a highly prevalent problem worldwide that can negatively affect quality of life and can result in many cardiac complications. One of the common causes of nasal obstruction is a devi- ated nasal septum.
Mohammed Dlawar Hashim, Arsalan Awlla Mustafa Shem, Muhammed Ahmed Sherwani   +2 more
doaj   +1 more source

Novel Surface‐Based Bézier Metamaterials: A Higher Degree of Parametrization toward Tailoring the Effective Properties under Compression

Advanced Engineering Materials, EarlyView.
Cubic Bézier curves are used in the synthesis of novel surface‐based metamaterials with tunable mechanical properties. Surface‐based geometries are 3D printed and tested in compression. The resulting mechanical properties are correlated to changes in the shape of the base curve, with high potential in energy absorption through the adjustment of their ...
Alberto Álvarez‐Trejo, Enrique Cuan‐Urquizo, Armando Roman‐Flores   +2 more
wiley   +1 more source

A Comprehensive Review of Additive Manufacturing for Space Applications: Materials, Advances, Challenges, and Future Directions

Advanced Engineering Materials, EarlyView.
Additive manufacturing (AM) transforms space hardware by enabling lightweight, high‐performance, and on‐demand production. This review outlines AM processes—powder bed fusion (PBF), directed energy deposition (DED), binder jetting (BJ), sheet lamination (SL), and material extrusion (ME)—applied to propulsion, satellite structures, and thermal devices ...
Stelios K. Georgantzinos, Eleni Papadopoulou, Grigorios Kostopoulos, Stefanos Voulgaris, Alexandra Tseni, Panteleimon Bakalis, Maria Gkara, Chara C. Mitropoulou, Nikos D. Lagaros   +8 more
wiley   +1 more source

The Effect of Exercise to P Wave Dispersion and Its Evaluation as a Predictor of Atrial Fibrillation

Annals of Noninvasive Electrocardiology, 2003
Aim: Prolongation of P wave time and increase of its dispersion as an independent predictor of atrial fibrillation. In patients with paroxysmal atrial fibrillation (PAF) as in healthy people, exercise augments sympathetic activity and therefore can cause
Zerrin Yiğit, Hülya Akdur, Murat Ersanli, Bariş Ökçün, Özen Güven   +4 more
doaj   +1 more source

Effect of transcatheter aortic valve replacement on P-wave duration, P-wave dispersion and left atrial size. [PDF]

J Geriatr Cardiol, 2015
Background P-wave dispersion (PWD), a measure of heterogeneity of atrial refractoriness, is defined as the difference between the maximum and minimum P-wave duration.
Dursun H, Tanriverdi Z, Colluoglu T, Kaya D.   +3 more
europepmc   +2 more sources