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Bounce back

A D Shaw, A R Champneys, M I Friswell
Sudden onset of violent chattering or whirling rotor-stator contact motion in rotational machines can cause significant damage in many industrial applications. It is shown that internal resonance can lead to the onset of bouncing-type partial contact motion away from primary resonances. These partial contact limit cycles can involve any two modes of an arbitrarily high degree-of-freedom system, and can be seen as an extension of a synchronization condition previously reported for a single disc system. The synchronization formula predicts multiple drivespeeds, corresponding to different forms of mode-locked bouncing orbits...
August 2016: Proceedings. Mathematical, Physical, and Engineering Sciences
Yi-Fu Cai, Salvatore Capozziello, Mariafelicia De Laurentis, Emmanuel N Saridakis
Over recent decades, the role of torsion in gravity has been extensively investigated along the main direction of bringing gravity closer to its gauge formulation and incorporating spin in a geometric description. Here we review various torsional constructions, from teleparallel, to Einstein-Cartan, and metric-affine gauge theories, resulting in extending torsional gravity in the paradigm of f (T) gravity, where f (T) is an arbitrary function of the torsion scalar. Based on this theory, we further review the corresponding cosmological and astrophysical applications...
October 2016: Reports on Progress in Physics
N Cohen, A Dotan, H Dodiuk, S Kenig
Superhydrophobic (SH) coatings have been shown to reduce freezing and ice nucleation rates, by means of low surface energy chemistry tailored with nano/micro roughness. Durability enhancement of SH surfaces is a crucial issue. Consequently, the present research on reducing ice adhesion is based on radiation-induced radical reaction for covalently bonding SiO2 nanoparticles to polymer coatings to obtain durable roughness. Results indicated that the proposed approach resulted in SH surfaces having high contact angles (>155°) and low sliding angles (<5°) with improved durability and transparency...
September 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Haruka Yasuoka, Masayuki Kaneda, Kazuhiko Suga
A methodology to simulate thermal fields in complex microflow geometries is proposed. For the flow fields, the regularized multiple-relaxation-time lattice Boltzmann method (LBM) is applied coupled with the diffusive-bounce-back boundary condition for wall boundaries. For the thermal fields, the regularized lattice Bhatnagar-Gross-Krook model is applied. For the thermal wall boundary condition, a newly developed boundary condition, which is a mixture of the diffuse scattering and constant temperature conditions, is applied...
July 2016: Physical Review. E
Gabriel G Carlo, R M Benito, F Borondo
We extend the semiclassical theory of short periodic orbits [M. Novaes et al., Phys. Rev. E 80, 035202(R) (2009)PLEEE81539-375510.1103/PhysRevE.80.035202] to partially open quantum maps, which correspond to classical maps where the trajectories are partially bounced back due to a finite reflectivity R. These maps are representative of a class that has many experimental applications. The open scar functions are conveniently redefined, providing a suitable tool for the investigation of this kind of system. Our theory is applied to the paradigmatic partially open tribaker map...
July 2016: Physical Review. E
Lore Thaler, Melvyn A Goodale
Bats and dolphins are known for their ability to use echolocation. They emit bursts of sounds and listen to the echoes that bounce back to detect the objects in their environment. What is not as well-known is that some blind people have learned to do the same thing, making mouth clicks, for example, and using the returning echoes from those clicks to sense obstacles and objects of interest in their surroundings. The current review explores some of the research that has examined human echolocation and the changes that have been observed in the brains of echolocation experts...
November 2016: Wiley Interdisciplinary Reviews. Cognitive Science
Martin H Klein Schaarsberg, Ivo R Peters, Menachem Stern, Kevin Dodge, Wendy W Zhang, Heinrich M Jaeger
We experimentally investigated the splashing of dense suspension droplets impacting a solid surface, extending prior work to the regime where the viscosity of the suspending liquid becomes a significant parameter. The overall behavior can be described by a combination of two trends. The first one is that the splashing becomes favored when the kinetic energy of individual particles at the surface of a droplet overcomes the confinement produced by surface tension. This is expressed by a particle-based Weber number We_{p}...
June 2016: Physical Review. E
Edward M Wojtys
No abstract text is available yet for this article.
July 2016: Sports Health
Pietro Cataldi, Ilker S Bayer, Roberto Cingolani, Sergio Marras, Ryad Chellali, Athanassia Athanassiou
Highly enhanced solid-state thermochromism is observed in regioregular poly(3-hexylthiophene), P3HT, when deposited on a superhydrophobic polymer-SiO2 nanocomposite coating. The conformal P3HT coating on the nanocomposite surface does not alter or reduce superhydrophicity while maintaining its reversible enhanced thermochromism. The polymeric matrix of the superhydrophobic surface is comprised of a blend of poly(vinylidene fluoride-co-hexafluoropropylene) copolymer and an acrylic adhesive. Based on detailed X-ray diffraction measurements, this long-lasting, repeatable and hysteresis-free thermochromic effect is attributed to the enhancement of the Bragg peak associated with the d-spacing of interchain directional packing (100) which remains unaltered during several heating-cooling cycles...
2016: Scientific Reports
Sandi J Lane, Elizabeth McGrady
UNLABELLED: Introduction Disasters often overwhelm a community's capacity to respond and recover, creating a gap between the needs of the community and the resources available to provide services. In the wake of multiple disasters affecting nursing homes in the last decade, increased focus has shifted to this vital component of the health care system. However, the long-term care sector has often fallen through the cracks in both planning and response. Problem Two recent reports (2006 and 2012) published by the US Department of Health and Human Services (DHHS), Office of Inspector General (OIG), elucidate the need for improvements in nursing homes' comprehensive emergency preparedness and response...
August 2016: Prehospital and Disaster Medicine
Shuqi Cui, Ning Hong, Baochang Shi, Zhenhua Chai
In this paper, we will focus on the multiple-relaxation-time (MRT) lattice Boltzmann model for two-dimensional convection-diffusion equations (CDEs), and analyze the discrete effect on the halfway bounce-back (HBB) boundary condition (or sometimes called bounce-back boundary condition) of the MRT model where three different discrete velocity models are considered. We first present a theoretical analysis on the discrete effect of the HBB boundary condition for the simple problems with a parabolic distribution in the x or y direction, and a numerical slip proportional to the second-order of lattice spacing is observed at the boundary, which means that the MRT model has a second-order convergence rate in space...
April 2016: Physical Review. E
Euan Sadler, Sophie Sarre, Anthea Tinker, Ajay Bhalla, Christopher McKevitt
Stroke can lead to physical, mental and social long-term consequences, with the incidence of stroke increasing with age. However, there is a lack of evidence of how to improve long-term outcomes for people with stroke. Resilience, the ability to 'bounce back', flourish or thrive in the face of adversity improves mental health and quality of life in older adults. However, the role of resilience in adjustment after stroke has been little investigated. The purpose of this study is to report on the development and preliminary evaluation of a novel intervention to promote resilience after stroke...
March 4, 2016: Health & Social Care in the Community
Chen Zhou, Aura Ontiveros-Valencia, Zhaocheng Wang, Juan Maldonado, He-Ping Zhao, Rosa Krajmalnik-Brown, Bruce E Rittmann
Recovering palladium (Pd) from waste streams opens up the possibility of augmenting the supply of this important catalyst. We evaluated Pd reduction and recovery as a novel application of a H2-based membrane biofilm reactor (MBfR). At steady states, over 99% of the input soluble Pd(II) was reduced through concomitant enzymatic and autocatalytic processes at acidic or near neutral pHs. Nanoparticulate Pd(0), at an average crystallite size of 10 nm, was recovered with minimal leaching and heterogeneously associated with microbial cells and extracellular polymeric substances in the biofilm...
March 1, 2016: Environmental Science & Technology
Arielle M Silverman, Aimee M Verrall, Kevin N Alschuler, Amanda E Smith, Dawn M Ehde
Purpose The purpose of this study was to describe the meaning of resilience, factors facilitating resilience and barriers to resilience, from the perspective of persons with multiple sclerosis (MS), their care partners and community stakeholders. Method We conducted four focus groups: two with middle-aged (36-62 years) individuals with MS [one with men (n = 6) and one with women (n = 6)], one for partners of individuals with MS (n = 11) and one with community stakeholders serving people with MS (n = 9)...
February 15, 2016: Disability and Rehabilitation
David Colas, Fabrice P Laussy
We study the propagation of noninteracting polariton wave packets. We show how two qualitatively different concepts of mass that arise from the peculiar polariton dispersion lead to a new type of particlelike object from noninteracting fields-much like self-accelerating beams-shaped by the Rabi coupling out of Gaussian initial states. A divergence and change of sign of the diffusive mass results in a "mass wall" on which polariton wave packets bounce back. Together with the Rabi dynamics, this yields propagation of ultrafast subpackets and ordering of a spacetime crystal...
January 15, 2016: Physical Review Letters
Hans IJzerman, Siegwart Lindenberg
In their target article, Kalisch et al. explicate an appraisal-based model to explain how people bounce back from stress. We posit that for their model, it is crucial to understand the begin-state φ (the "self") - a state that is shaped by early social thermoregulation and through the social network.
2015: Behavioral and Brain Sciences
Genevieve E Chandler, Susan Jo Roberts, Lisa Chiodo
BACKGROUND: Adverse childhood experiences (ACEs) are correlated with risk behaviors of smoking, disordered eating, and alcohol and substance abuse. Such behaviors can lead to significant public health problems of chronic obstructive pulmonary disease, obesity, liver disease, and hypertension, yet some individuals do not appear to suffer negative consequences but rather bounce back. OBJECTIVE: To pilot the feasibility and potential efficacy of the Empower Resilience Intervention to build capacity by increasing resilience and health behaviors and decreasing symptoms and negative health behaviors with young adults in an educational setting who have had ACEs...
November 2015: Journal of the American Psychiatric Nurses Association
J Storkey, A J Macdonald, P R Poulton, T Scott, I H Köhler, H Schnyder, K W T Goulding, M J Crawley
The negative effect of increasing atmospheric nitrogen (N) pollution on grassland biodiversity is now incontrovertible. However, the recent introduction of cleaner technologies in the UK has led to reductions in the emissions of nitrogen oxides, with concomitant decreases in N deposition. The degree to which grassland biodiversity can be expected to 'bounce back' in response to these improvements in air quality is uncertain, with a suggestion that long-term chronic N addition may lead to an alternative low biodiversity state...
December 17, 2015: Nature
Xinguang Chen, Yan Wang, Yaqiong Yan
Further advancement in stress and health research calls for better tools to assess resilience. In this study, we developed the Essential Resilience Scale (ERS) and investigated the association between ERS scores and several health and behaviour measures. We developed the ERS with an operationalized definition of resilience-an individual's capability to anticipate, be flexible with and bounce back from three types of traumatic and adverse events (physical, emotional and social). The 15-item ERS was assessed using survey data from a diverse sample (n = 238, aged 18-45 years, 76 rural-to-urban migrants, 85 rural residents, 77 urban residents) recruited in Wuhan, China...
November 6, 2015: Stress and Health: Journal of the International Society for the Investigation of Stress
Ollie Hart, Beverly A Ryton
There is good evidence to suggest that a proactive stratified approach to management of spinal pain, taking into account psychosocial as well as biological factors, can realise significant savings for health-care systems and perhaps more importantly, health benefits for society at large. This audit cycle report captures data on quality of care and patient flows before and after the mandating of changes to the referral pathways in primary care. These included the introduction of a simple one-sided referral proforma, bounce back of inappropriate referrals from secondary care to physiotherapy lead teams and implementation of the STarT tool, as a decision aid in primary care...
February 2014: British Journal of Pain
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