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https://www.readbyqxmd.com/read/28820198/dark-excitons-and-tunable-optical-gap-in-graphene-nanodots
#1
Yingjie Zhang, Weidong Sheng, Yang Li
By using a configuration interaction approach with up to the fifth excitations taken into account, we study the excitonic effect in the optical absorption in graphene nanodots. While the many-electron states are either singlet or doublet in a triangular nanodot system, all the excited singlet states are found to be optically dark in the absorption. These dark excitons are shown to originate mainly from the geometric symmetry of the system and would remain inactive even when the electron-hole or sublattice symmetry is broken...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28819607/a-gustilo-type-3b-open-tibial-fracture-treated-with-a-proximal-flexor-hallucis-longus-flap-a-case-report
#2
Tomohiro Yasuda, Masayuki Arai, Kaoru Sato, Koji Kanzaki
INTRODUCTION: In the treatment of Gustilo Type 3B open tibial fractures, it is important to perform soft tissue reconstruction and bone reconstruction simultaneously. Gastrocnemius muscle and soleus muscle flaps are generally used as rotational flaps for the tibia. The distal third of the tibia can often not be covered with the gastrocnemius muscle and soleus muscle flaps. Treatment distal to the distal third of the tibia is difficult because fewer flap options are available. In the present report, we describe our experience with a Gustilo Type 3B open tibial fracture treated by gastrocnemius muscle and soleus muscle flaps, along with an additional proximally based flexor hallucis longus flap, which is a rare procedure...
March 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28819019/retrospectively-assessed-physical-work-environment-during-working-life-and-risk-of-sickness-absence-and-labour-market-exit-among-older-workers
#3
Emil Sundstrup, Åse Marie Hansen, Erik Lykke Mortensen, Otto Melchior Poulsen, Thomas Clausen, Reiner Rugulies, Anne Møller, Lars L Andersen
OBJECTIVE: To determine the prospective association between retrospectively assessed physical work environment during working life and prospectively assessed sickness absence and labour market exit among older workers. METHODS: Using Cox regression analyses we estimated the 4-year to 6-year prospective risk of register-based long-term sickness absence (LTSA), disability pension, early retirement and unemployment from exposure to different physical work environmental factors during working life among 5076 older workers (age 49-63 at baseline) from the Copenhagen Aging and Midlife Biobank cohort...
August 17, 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28814032/studying-the-implementation-of-iterative-impedance-control-for-assistive-hand-rehabilitation-using-an-exoskeleton
#4
T Martineau, R Vaidyanathan
A positive training synergy can be obtained when two individuals attempt to learn the same motor task while mechanically coupled to one another. In this paper, we have studied how mimicking this interaction through impedance control can be exploited to improve assistance delivered by hand exoskeleton devices during rehabilitation. In this context, the machine and user take complementary roles akin to two coupled individuals. We present the derivation of a dynamic model of the human hand for the purpose of controller development for new hand exoskeleton platforms...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814016/applying-a-soft-robotic-glove-as-assistive-device-and-training-tool-with-games-to-support-hand-function-after-stroke-preliminary-results-on-feasibility-and-potential-clinical-impact
#5
Gerdienke B Prange-Lasonder, Bob Radder, Anke I R Kottink, Alejandro Melendez-Calderon, Jaap H Buurke, Johan S Rietman
Recent technological developments regarding wearable soft-robotic devices extend beyond the current application of rehabilitation robotics and enable unobtrusive support of the arms and hands during daily activities. In this light, the HandinMind (HiM) system was developed, comprising a soft-robotic, grip supporting glove with an added computer gaming environment. The present study aims to gain first insight into the feasibility of clinical application of the HiM system and its potential impact. In order to do so, both the direct influence of the HiM system on hand function as assistive device and its therapeutic potential, of either assistive or therapeutic use, were explored...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813995/a-novel-human-effort-estimation-method-for-knee-assistive-exoskeletons
#6
Lorenzo Saccares, Anais Brygo, Ioannis Sarakoglou, Nikos G Tsagarakis
In this work we present a novel method to estimate online the torques at the knee joints with the goal to generate reference signals for knee assistive devices. One of the main advantages of the proposed approach is its reduced sensing requirements, which leads to an ergonomic setup with minimal instrumentation, especially above the knee and of the upper body. Indeed, only the measurement of the forces and torques exchanged between the ground and the user's feet, the posture of the shanks, and the model of the user's shank itself are needed for the estimation of the knee torque...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813839/timing-of-intermittent-torque-control-with-wire-driven-gait-training-robot-lifting-toe-trajectory-for-trip-avoidance
#7
Tamon Miyake, Yo Kobayashi, Masakatsu G Fujie, Shigeki Sugano
Gait training robots are useful for changing gait patterns and decreasing risk of trip. Previous research has reported that decreasing duration of the assistance or guidance of the robot is beneficial for efficient gait training. Although robotic intermittent control method for assisting joint motion has been established, the effect of the robot intervention timing on change of toe clearance is unclear. In this paper, we tested different timings of applying torque to the knee, employing the intermittent control of a gait training robot to increase toe clearance throughout the swing phase...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813808/experimental-evaluation-of-a-semg-based-control-for-elbow-wearable-assistive-devices-during-load-lifting-tasks
#8
Roberto Meattini, Gianluca Palli, Claudio Melchiorri
In this work, a surface skin electromyography(sEMG)-based control solution for elbow wearable assistive devices during load lifting tasks is presented. The goal of the controller consists in limiting the user's muscle activity during the task execution, in such a way that the assistive device can partially compensate the load-related biceps muscle effort. Since sEMG-driven control strategies based on the estimation of the joint torques generally requires complex task- and subject-dependent training sessions for tuning the control algorithms, here a more direct control approach is proposed, based on a muscle activity error related proportional-integral action together with an double-threshold activation logic...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813796/feedforward-model-based-arm-weight-compensation-with-the-rehabilitation-robot-armin
#9
Fabian Just, Ozhan Ozen, Stefano Tortora, Robert Riener, Georg Rauter
Highly impaired stroke patients at early stages of recovery are unable to generate enough muscle force to lift the weight of their own arm. Accordingly, task-related training is strongly limited or even impossible. However, as soon as partial or full arm weight support is provided, patients are enabled to perform arm rehabilitation training again throughout an increased workspace. In the literature, the current solutions for providing arm weight support are mostly mechanical. These systems have components that restrict the freedom of movement or entail additional disturbances...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28811750/availability-of-a-sports-dietitian-may-lead-to-improved-performance-and-recovery-of-ncaa-division-i-baseball-athletes
#10
Michael V Hull, Jonathan Neddo, Andrew R Jagim, Jonathan M Oliver, Mike Greenwood, Margaret T Jones
BACKGROUND: The purpose was to survey dietary habits (DH) and nutrient timing (NT) practices of baseball student-athletes (mean ± SD; 20.7 ± 1.4 yr.) from three NCAA Division I institutions, and examine the effect of a sports dietitian (SD) in regard to nutrition practices. METHODS: Descriptive statistics and Pearson X(2) analyses were run. Responses on 10 DH and 5 NT items differed (p ≤ 0.10) between athletes who sought dietary planning from a SD (n = 36) versus those who consulted a strength and conditioning coach (SCC, n = 42)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28810999/case-report-on-the-use-of-a-custom-myoelectric-elbow-wrist-hand-orthosis-for-the-remediation-of-upper-extremity-paresis-and-loss-of-function-in-chronic-stroke
#11
Stefanie Dunaway, D Brianna Dezsi, Jessica Perkins, Daniel Tran, Jonathan Naft
INTRODUCTION: This case study describes the application of a commercially available, custom myoelectric elbow-wrist-hand orthosis (MEWHO), on a veteran diagnosed with chronic stroke with residual left hemiparesis. The MEWHO provides powered active assistance for elbow flexion/extension and 3 jaw chuck grip. It is a noninvasive orthosis that is driven by the user's electromyographic signal. Experience with the MEWHO and associated outcomes are reported. MATERIALS AND METHODS: The participant completed 21 outpatient occupational therapy sessions that incorporated the use of a custom MEWHO without grasp capability into traditional occupational therapy interventions...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28810736/microstructure-of-flow-driven-suspension-of-hardspheres-in-cylindrical-confinement-a-dynamical-density-functional-theory-and-monte-carlo-study
#12
Hsiu-Yu Yu, Zahera Jabeen, David M Eckmann, Portonovo S Ayyaswamy, Ravi Radhakrishnan
We have studied the microstructure of a flow-driven hardsphere suspension inside a cylinder using dynamical density functional theory and Monte Carlo simulations. In order to be representative of various physical conditions that may prevail in experiments, we investigate the problem using both the grand canonical ($\mu VT$) ensemble and the canonical ($NVT$) ensemble. In both ensembles, the hydrodynamic effect on the suspension mediated by the presence of the confining wall is implemented in a mean-field fashion by incorporating the thermodynamic work done by the inertial lift force on the particle given the average flow field...
August 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28809028/lifting-the-veil-on-reptile-embryology-the-veiled-chameleon-chamaeleo-calyptratus-as-a-model-system-to-study-reptilian-development
#13
Raul E Diaz, Federica Bertocchini, Paul A Trainor
Living amniotes comprise three major phylogenetic lineages: mammals, birds, and non-avian reptiles. Mouse and avian embryos continue to be the primary species used in experimental settings to further our knowledge and understanding of the genetics and embryology of amniotes. In comparison, non-avian reptiles, which constitute up to 40% of all living amniotes, have played a comparatively minor role. Studies of non-avian reptiles are, however, paramount for providing insights into the evolutionary changes that occurred in the transition from reptilian-like amniote ancestors to derived mammalian and avian species...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28808824/gasless-single-incision-laparoscopic-inguinal-hernia-repair-initial-experience
#14
M W V Ng, K C Ng
PURPOSE: Laparoscopic hernioplasty has been gaining its popularity in the past decade for its rapid recovery. Single-incision surgery, as its possible advancement, has also received more attention. Traditional laparoscopic surgery with carbon dioxide insufflation precluded patients with underlying cardiovascular or pulmonary disease from minimal invasive surgery. We report our early experience with gasless single-incision laparoscopic inguinal hernia repair via totally extraperitoneal (TEP) approach...
August 14, 2017: Hernia: the Journal of Hernias and Abdominal Wall Surgery
https://www.readbyqxmd.com/read/28806767/hydrodynamic-repulsion-of-spheroidal-microparticles-from-micro-rough-surfaces
#15
Aleksey V Belyaev
Isolation of microparticles and biological cells from mixtures and suspensions is a central problem in a variety of biomedical applications. This problem, for instance, is of an immense importance for microfluidic devices manipulating with whole blood samples. It is instructive to know how the mobility and dynamics of rigid microparticles is altered by the presence of micrometer-size roughness on walls. The presented theoretical study addresses this issue via computer simulations. The approach is based on a combination of the Lattice Boltzmann method for calculating hydrodynamics and the Lagrangian Particle dynamics method to describe the dynamics of cell membranes...
2017: PloS One
https://www.readbyqxmd.com/read/28805872/microfluidic-co-flow-of-newtonian-and-viscoelastic-fluids-for-high-resolution-separation-of-microparticles
#16
Fei Tian, Wei Zhang, Lili Cai, Shanshan Li, Guoqing Hu, Yulong Cong, Chao Liu, Tiejun Li, Jiashu Sun
The microfluidic passive control of microparticles largely relies on the hydrodynamic effects of the carrier media such as Newtonian fluids and viscoelastic fluids. Yet the viscoelastic/Newtonian interfacial effect has been scarcely investigated, especially for high-resolution particle separation. Here we report a microfluidic co-flow of Newtonian (water or PBS) and viscoelastic fluids (PEO) for the size-dependent separation of microparticles. The co-flow condition generates a stable viscoelastic/Newtonian interface, giving rise to the wall-directed elastic lift forces that compete with the center-directed lift forces, and efficiently hinders the migration of microparticles from the Newtonian to the viscoelastic fluid in a size-dependent manner...
August 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28805817/room-temperature-current-blockade-in-atomically-defined-single-cluster-junctions
#17
Giacomo Lovat, Bonnie Choi, Daniel W Paley, Michael L Steigerwald, Latha Venkataraman, Xavier Roy
Fabricating nanoscopic devices capable of manipulating and processing single units of charge is an essential step towards creating functional devices where quantum effects dominate transport characteristics. The archetypal single-electron transistor comprises a small conducting or semiconducting island separated from two metallic reservoirs by insulating barriers. By enabling the transfer of a well-defined number of charge carriers between the island and the reservoirs, such a device may enable discrete single-electron operations...
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28802434/evaluation-of-postural-sway-and-impact-forces-during-ingress-and-egress-of-scissor-lifts-at-elevations
#18
Christopher S Pan, Sharon S Chiou, Tsui-Ying Kau, Bryan M Wimer, Xiaopeng Ning, Paul Keane
Workers are at risk when entering (ingress) or exiting (egress) elevated scissor lifts. In this study, we recorded ground impact forces and postural sway from 22 construction workers while they performed ingress and egress between a scissor lift and an adjacent work surface with varying conditions: lift opening designs, horizontal and vertical gaps, and sloped work surfaces. We observed higher peak ground shear forces when using a bar-and-chain opening, with larger horizontal gap, with the lift surface more than 0...
November 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28802429/paramedics-working-strategies-while-loading-a-stretcher-into-an-ambulance
#19
J Prairie, A Plamondon, D Larouche, S Hegg-Deloye, P Corbeil
For paramedics, loading a stretcher into an ambulance is an activity with a high risk of back injury and accidents. The objective of this study was to document strategies paramedics use at work while loading a powered stretcher into an ambulance. A total of 249 stretcher loading operations performed by 58 paramedics, and 51 semistructured post-intervention interviews were analyzed. Almost three quarters of loading operations required additional actions (e.g., raising the shoulders and additional lifting) to insert the stretcher into the cot fastener system in the ambulance...
November 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28801946/imitation-inhibition-in-children-with-tourette-syndrome
#20
Valerie Cathérine Brandt, Agnes Moczydlowski, Melanie Jonas, Kai Boelmans, Tobias Bäumer, Marcel Brass, Alexander Münchau
OBJECTIVE: Echopraxia, that is, the open and automatic imitation of other peoples' actions, is common in patients with Gilles de la Tourette syndrome, autism spectrum disorder, and also those with frontal lobe lesions. While systematic reaction time tasks have confirmed increased automatic imitation in the latter two groups, adult patients with Tourette syndrome appear to compensate for automatic imitation tendencies by an overall slowing in response times. However, whether children with Tourette syndrome are already able to inhibit automatic imitation tendencies has not been investigated...
August 12, 2017: Journal of Neuropsychology
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