Results 41 to 50 of about 18,755 (215)

Standards for helmets [PDF]

Canadian Medical Association Journal, 2012
I want to thank CMAJ for publicizing that most domestic and imported snow sport helmets currently do not meet the Canadian Safety Association’s (CSA) standards for preventing concussion and withstanding multiple impacts.1 On Mar. 19, 2007, I tabled Private Member’s Bill C-412 that would prohibit the advertising, import or sale of recreational snow ...
openaire   +2 more sources

A New Paradigm for Understanding the Rheology and Processability of Poly(p‐Phenylene Terephthalamide) Liquid‐Crystalline Solutions

Journal of Applied Polymer Science, EarlyView.
Kevlar is traditionally modeled as a rigid‐rod polymer, yet rheological behavior deviates from this assumption. The review introduces a novel “twist‐tie” entanglement theory for aramid polymer chains in the nematic liquid crystal state, providing a molecular explanation for deviations from rigid‐rod models. Understanding twist‐tie entanglement dynamics
Emma Egli, Jacob L. Pretko, Christopher W. Seay, Steven R. Lustig   +3 more
wiley   +1 more source

Helmet Laws, Helmet Use, and Bicycle Ridership [PDF]

Journal of Adolescent Health, 2016
To assess bicycle helmet laws' effect on helmet and bicycle use among U.S. high school students in urban jurisdictions.Log-binomial models were fit to Youth Risk Behavior Survey data from five jurisdictions. Adjusted helmet and bicycle use proportions were calculated with post-regression marginal effects.
openaire   +2 more sources

A Prospection‐Led Archaeological Investigation of a Picenian and Roman Necropolis in Corinaldo (Marche, Italy)

Archaeological Prospection, EarlyView.
ABSTRACT This paper presents the results of an integrated archaeological and geophysical investigation conducted between 2018 and 2024 at the newly discovered Picenian and Roman necropolis of Contrada Nevola (Corinaldo, Marche, Central Italy), identified in the framework of development‐led archaeology. The research strategy combined aerial photography,
Federica Boschi
wiley   +1 more source

The Degradation of Access‐Based Business Models: Customer Misbehavior and Shared Mobility

Business Strategy and the Environment, EarlyView.
ABSTRACT Access‐based services are considered one of the strategies to embed sustainability in business models. Yet, because the evolution of these business models has been overlooked, we do not know whether their promise to create triple value is sustained.
Andres Camacho, Carmen Valor
wiley   +1 more source

Experimental investigation of a viscoelastic liner to reduce under helmet overpressures and shock wave reflections

Frontiers in Bioengineering and Biotechnology
IntroductionShock wave overpressure exposures can result in blast-induced traumatic brain injury (bTBI) in warfighters. Although combat helmets provide protection against blunt impacts, the protection against blast waves is limited due to the observed ...
Cody J. H. Thomas, Fatih Dogan, Catherine E. Johnson   +2 more
doaj   +1 more source

Characteristics of Sensitive Scalp in French Women and Comparison With Scalp Dermatoses

JEADV Clinical Practice, EarlyView.
ABSTRACT Background A sensitive scalp is a particular location of sensitive skin, characterised by the occurrence of unpleasant sensations which cannot be explained by a skin disease. It is a common syndrome that could affect 30%–50% of women. Clinical data are scarce, and the impact on the quality of life poorly described.
Ficheux Anne‐Sophie, Melessike Kristel, Misery Laurent, Brenaut Emilie   +3 more
wiley   +1 more source

Design of an 8‐Channel Transmit 32‐Channel Receive 11.7T Head Coil and Evaluation of SNR Gains

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To design and develop an 8‐channel transmit 32‐channel receive 11.7T head coil for the strongest human MRI scanner to date, demonstrate safety, and evaluate signal‐to‐noise ratio (SNR) gains compared to 7T, the most used ultra‐high‐field (UHF) platform.
Son Chu, Jeslin Parackal Issac, Caroline Le Ster, Alexis Amadon, Vincent Gras, Paul‐François Gapais, Rüdiger Stirnberg, Nicolas Boulant, Shajan Gunamony   +8 more
wiley   +1 more source

Rural adolescent attitudes and use of bicycle helmets in Iowa

Injury Epidemiology
Background Helmet use significantly decreases head injuries, the most common cause of bicycle-related fatalities in youth. Our objective was to determine bicycle helmet use by rural adolescents, their attitudes regarding helmets, and associated ...
Brooke L. Askelsen, Brianna J. Iverson, Devin E. Spolsdoff, Pam J. Hoogerwerf, Brenda Vergara, Charles A. Jennissen   +5 more
doaj   +1 more source

Experimental and Modeling Investigation of Seawater Hydrolysis Effects on Aramid Fiber Rupture Behavior

Journal of Polymer Science, EarlyView.
Hydrolytic aging in seawater produces markedly different mechanical responses among commercial Aramid fibers. While some fibers exhibit progressive degradation, others maintain stable or even improved tensile behavior. Experimental yarn‐scale testing combined with mathematical degradation modeling and Arrhenius‐based lifetime prediction provides new ...
Daniel Magalhães da Cruz, Ignacio Melito, Tales Luiz Popiolek Júnior, Jakson Manfredini Vassoler, Felipe Tempel Stumpf, Fernanda Mazuco Clain, Carlos Eduardo Marcos Guilherme   +6 more
wiley   +1 more source