Results 41 to 50 of about 23,592 (266)

Gravity‐Dependent Modulation of Downbeat Nystagmus: Insights From Velocity‐Storage Dysfunction

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Downbeat nystagmus varies with head position, a phenomenon termed gravity‐dependent modulation. We aimed to clarify its mechanism using a velocity‐storage model. Methods In 10 patients with downbeat nystagmus due to cerebellar disorders, we recorded eye movements at different pitch‐ and roll‐axis head positions.
Ji‐Hyung Park, Eun‐Hyuk Choi, Jorge Otero‐Millan, David S. Zee, Jeong‐Yoon Choi, Ji‐Soo Kim   +5 more
wiley   +1 more source

Torsional strain-induced microstructural control in magnesium alloys: A pathway to enhanced mechanical performance

Materials & Design
To achieve a strength-ductility synergy in extruded ZM6 magnesium alloy, three torsion-dominated heterogeneous plastic deformation processes were proposed. The deformation mechanisms and the evolution of microstructure, texture, twin volume fraction (TVF)
Xiaodan Zhang, Xiaochuan Sun, Chuhao Liu, Kecheng Zhou, Huamiao Wang, Peidong Wu   +5 more
doaj   +1 more source

Experimental and Simulation Studies of Strength and Fracture Behaviors of Wind Turbine Bearing Steel Processed by High Pressure Torsion

Energies, 2016
White structure flaking (WSF) has been found to be one of the failure modes in bearing steels under rolling contacts through the formation of cracks associated with a microstructural change called white etching area (WEA).
Ning Wang, Luis V. Wilches Peña, Ling Wang, B. G. Mellor, Yi Huang   +4 more
doaj   +1 more source

Torsional Mechanics of Circular DNA

Circular DNA found in the cell is actively regulated to an underwound state, with their superhelical density close to σ ∼ - 0.06. While this underwound state is essential to life, how it impacts the torsional mechanical properties of DNA is not fully understood.
Gundeep Singh, Yifeng Hong, James T. Inman, James P. Sethna, Michelle D. Wang   +4 more
openaire   +2 more sources

Artificial Intelligence in Systemic Sclerosis: Clinical Applications, Challenges, and Future Directions

Arthritis Care &Research, EarlyView.
Systemic sclerosis (SSc) is a rare autoimmune disease defined by immune dysregulation, vasculopathy, and progressive fibrosis of the skin and internal organs. Despite advances in care, major complications such as interstitial lung disease (ILD) and myocardial involvement remain the leading causes of morbidity and mortality.
Cristiana Sieiro Santos, José Miguel Sequí‐Sabater, Diego Benavent   +2 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

Patient with antiphospholipid syndrome presenting with testicular torsion-like symptoms

Urology Case Reports, 2017
Testicular torsion, a urological emergency, occurs due to absence of testicular blood supply secondary to a mechanical twist of the spermatic cord. The authors describe a 28-year-old male who presented with torsion symptoms, first in the left testicle ...
Arnav Srivastava, Joan Ko, Joy Ogunsile, Alison Moliterno, William H. Westra, Alice Semerjian   +5 more
doaj   +1 more source

The Mechanism of Transcription Stalling under Torsion [PDF]

Biophysical Journal, 2015
During transcription, RNA polymerase (RNAP) translocates along DNA and introduces torsional stress, and excessive torque accumulation can lead to transcription stalling. We previously measured this stall torque for E. coli RNAP during transcription1. However the mechanism and regulation of RNAP stalling under torsion has remained elusive.
Tan, Chuang, Ma, Jie, Bird, Jeremy G., Inman, James T., Roberts, Jeffrey W., Wang, Michelle D.   +5 more
openaire   +1 more source

Analysis of dynamic mechanical response in torsion [PDF]

Journal of Rheology, 2016
We investigate the dynamic response of industrial rubbers (styrene-butadiene random copolymers, SBR) in torsion and compare against common small amplitude oscillatory shear measurements by using a torsion rectangular fixture, a modified torsion cylindrical fixture, and a conventional parallel plate fixture, respectively, in two different rheometers ...
Dessi, Claudia, Tsibidis, George D., Vlassopoulos, Dimitris, DE CORATO, MARCO, TROFA, MARCO, D'AVINO, GAETANO, MAFFETTONE, PIER LUCA, Coppola, Salvatore   +7 more
openaire   +3 more sources

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