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https://www.readbyqxmd.com/read/28817715/longitudinal-sequencing-in-intramuscular-coordination-a-new-hypothesis-of-dynamic-functions-in-the-human-rectus-femoris-muscle
#1
Christoph von Laßberg, Julia A Schneid, Dominik Graf, Felix Finger, Walter Rapp, Norman Stutzig
The punctum fixum-punctum mobile model has been introduced in previous publications. It describes general principles of intersegmental neuromuscular succession patterns to most efficiently generate specific movement intentions. The general hypothesis of this study is that these principles-if they really do indicate a fundamental basis for efficient movement generation-should also be found in intramuscular coordination and should be indicated by "longitudinal sequencing" between fibers according to the principles of the punctum fixum-punctum mobile model...
2017: PloS One
https://www.readbyqxmd.com/read/28814032/studying-the-implementation-of-iterative-impedance-control-for-assistive-hand-rehabilitation-using-an-exoskeleton
#2
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/28813840/a-novel-protocol-to-evaluate-ankle-movements-during-reaching-tasks-using-pedianklebot
#3
Francesca Martelli, Eduardo Palermo, Stefano Rossi
The aim of the study is to design a novel protocol to characterize the ankle movements during dorsal and plantar flexion reaching tasks using the pediAnklebot. Five healthy children were instructed to control a pointer and hit targets appearing on the monitor, by moving their ankle alternatively up and down. The protocol consisted of 60 targets, 30 up and 30 down, reachable via dorsiflexion and plantarflexion movements, respectively. Ankle angular displacements and torques were gathered by encoders and load cells embedded in the robot...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812844/clinician-perspectives-of-barriers-to-effective-implementation-of-a-rapid-response-system-in-an-academic-health-centre-a-focus-group-study
#4
John Rihari-Thomas, Michelle DiGiacomo, Jane Phillips, Phillip Newton, Patricia M Davidson
BACKGROUND: Systemic and structural issues of rapid response system (RRS) models can hinder implementation. This study sought to understand the ways in which acute care clinicians (physicians and nurses) experience and negotiate care for deteriorating patients within the RRS. METHODS: Physicians and nurses working within an Australian academic health centre within a jurisdictional-based model of clinical governance participated in focus group interviews. Verbatim transcripts were analysed using thematic content analysis...
January 1, 2017: International Journal of Health Policy and Management
https://www.readbyqxmd.com/read/28808710/interface-nanoparticle-control-of-a-nanometer-water-pump
#5
Jiaye Su, Yunzhen Zhao, Chang Fang, Syed Bilal Ahmed, Yue Shi
Nanoparticles are highly versatile and exhibit broad applications in tuning material properties. Herein, we show through molecular dynamics simulations the possibility of a nanometer water pump, driven by the motion of nanoparticles (NPs) on a membrane surface. Surprisingly, considerable net water flux can be induced through a carbon nanotube (CNT) that is perpendicular to the NP motion. The water transport can occur in a highly controllable fashion, not only by using a single NP with different forces, but also by varying the CNT length or the NP number...
August 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28805653/magneto-optical-properties-of-topological-insulator-thin-films-with-broken-inversion-symmetry
#6
Kulsoom Rahim, Ahsan Ullah, Muhammad Tahir, Kashif Sabeeh
We determine the optical response of ultrathin film topological insulators in the presence of a quantizing external magnetic field taking into account both hybridization between surface states, broken inversion symmetry and explicit time reversal symmetry breaking by the magnetic field. We find that breaking of inversion symmetry in the system, which can be due to interaction with a substrate or electrical gating, results in Landau level crossings and opening of additional optical transition channels that were previously forbidden...
August 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28803219/revealing-the-mechanisms-of-human-face-perception-using-dynamic-apertures
#7
Jennifer Murphy, Richard Cook
Faces are notoriously hard to perceive when turned upside-down. It is often claimed that perceptual decrements reflect a qualitative switch from parallel whole-face processing, to a serial analysis of individual features. To test this view, we examined observers' ability to categorize faces presented in their entirety, or viewed through a dynamic aperture that moved incrementally across the facial image. Exposing faces region-by-region disrupts holistic processing, but permits serial analysis of local features...
August 10, 2017: Cognition
https://www.readbyqxmd.com/read/28801556/collective-modes-in-simple-melts-transition-from-soft-spheres-to-the-hard-sphere-limit
#8
Sergey Khrapak, Boris Klumov, Lénaïc Couëdel
We study collective modes in a classical system of particles with repulsive inverse-power-law (IPL) interactions in the fluid phase, near the fluid-solid coexistence (IPL melts). The IPL exponent is varied from n = 10 to n = 100 to mimic the transition from moderately soft to hard-sphere-like interactions. We compare the longitudinal dispersion relations obtained using molecular dynamic (MD) simulations with those calculated using the quasi-crystalline approximation (QCA) and find that this simple theoretical approach becomes grossly inaccurate for [Formula: see text]...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800713/application-of-high-speed-dual-fluoroscopy-to-study-in-vivo-tibiotalar-and-subtalar-kinematics-in-patients-with-chronic-ankle-instability-and-asymptomatic-control-subjects-during-dynamic-activities
#9
Koren E Roach, K Bo Foreman, Alexej Barg, Charles L Saltzman, Andrew E Anderson
BACKGROUND: Abnormal angular and translational (ie, kinematic) motion at the tibiotalar and subtalar joints is believed to cause osteoarthritis in patients with chronic ankle instability (CAI). METHODS: In this preliminary study the investigators quantified and compared in vivo tibiotalar and subtalar kinematics in 4 patients with CAI (3 women) and 10 control subjects (5 men) using dual fluoroscopy during a balanced, single-leg heel-rise and treadmill walking at 0...
August 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28800490/oxytocin-secretion-is-pulsatile-in-men-and-is-related-to-social-emotional-functioning
#10
Charumathi Baskaran, Franziska Plessow, Lisseth Silva, Elisa Asanza, Dean Marengi, Kamryn T Eddy, Patrick M Sluss, Michael L Johnson, Madhusmita Misra, Elizabeth A Lawson
The hypothalamic hormone oxytocin (OXT) plays an important role in a range of physiological processes and social-emotional functioning in both sexes. In women, physiological stimuli, such as suckling and parturition, result in pulsatile release of OXT into the peripheral circulation via the posterior pituitary gland. However, data regarding OXT secretory patterns in men during a state of rest are limited. Further, the relationship between secretory dynamics of OXT and emotional measures has never been evaluated...
July 24, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28798697/cardiac-autonomic-modulation-and-the-kinetics-of-heart-rate-responses-in-the-on-and-off-transient-during-exercise-in-women-with-metabolic-syndrome
#11
Lucas R B E Silva, Antonio R Zamunér, Paulo Gentil, Fagner M Alves, Acácia G F Leal, Viviane Soares, Maria S Silva, Marcus F Vieira, Karina Simões, Gustavo R Pedrino, Ana C S Rebelo
Objective: To test whether women with metabolic syndrome (MS) have impairments in the on- and off-transients during an incremental test and to study whether any of the MS components are independently associated with the observed responses. Research Design and Methods: Thirty-six women aged 35-55 years were divided into a group with MS (MSG, n = 19) and a control group (CG, n = 17). R-R intervals (RRi) and heart rate variability (HRV) were calculated on a beat-to-beat basis and the heart rate (HR) at the on- and off-transient were analyzed during an incremental cardiopulmonary exercise test (CPET)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28796800/the-temporal-dynamics-of-the-tracheal-microbiome-in-tracheostomised-patients-with-and-without-lower-respiratory-infections
#12
Marcos Pérez-Losada, Robert J Graham, Madeline Coquillette, Amenah Jafarey, Eduardo Castro-Nallar, Manuel Aira, Robert J Freishtat, Jonathan M Mansbach
BACKGROUND: Airway microbiota dynamics during lower respiratory infection (LRI) are still poorly understood due, in part, to insufficient longitudinal studies and lack of uncontaminated lower airways samples. Furthermore, the similarity between upper and lower airway microbiomes is still under debate. Here we compare the diversity and temporal dynamics of microbiotas directly sampled from the trachea via tracheostomy in patients with (YLRI) and without (NLRI) lower respiratory infections...
2017: PloS One
https://www.readbyqxmd.com/read/28794418/a-controlled-ac-stark-echo-for-quantum-memories
#13
Byoung S Ham
A quantum memory protocol of controlled ac Stark echoes (CASE) based on a double rephasing photon echo scheme via controlled Rabi flopping is proposed. The double rephasing scheme of photon echoes inherently satisfies the no-population inversion requirement for quantum memories, but the resultant absorptive echo remains a fundamental problem. Herein, it is reported that the first echo in the double rephasing scheme can be dynamically controlled so that it does not affect the second echo, which is accomplished by using unbalanced ac Stark shifts...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28790119/complementary-value-of-contralateral-parenchymal-enhancement-on-dce-mri-to-prognostic-models-and-molecular-assays-in-high-risk-er-her2-breast-cancer
#14
Bas H M van der Velden, Sjoerd G Elias, Tycho Bismeijer, Claudette E Loo, Max A Viergever, Lodewyk F A Wessels, Kenneth G A Gilhuijs
Purpose: To determine whether markers of healthy breast stroma are able to select a subgroup of patients at low risk of death or metastasis from patients considered at high risk according to routine markers of the tumor. <p>Experimental Design: Patients with ER-positive/HER2-negative breast cancer were consecutively included for retrospective analysis. The contralateral parenchyma was segmented automatically on dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), whereupon the average of the top-10% late enhancement was calculated...
August 8, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28783319/sharper-reaction-monitoring-generation-of-a-narrow-line-width-nmr-singlet-without-x-pulses-in-an-inhomogeneous-magnetic-field
#15
Ariana B Jones, Guy C Lloyd-Jones, Dusan Uhrin
We report a new 'pure-shift' method, termed 'SHARPER' (Sensitive, Homogeneous And Resolved PEaks in Real time) de-signed for the analysis of reactions and equilibria by NMR. By focusing on a single selected signal, SHARPER removes all heteronuclear couplings of a selected nucleus without the need to pulse on X channels, thus overcoming hardware limitations of conventional spectrometers. A more versatile decoupling scheme, termed 'sel-SHARPER', removes all heteronuclear and homonuclear couplings of the selected signal...
August 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28777353/a-dimensionality-reduction-based-multi-step-clustering-method-for-robust-vessel-trajectory-analysis
#16
Huanhuan Li, Jingxian Liu, Ryan Wen Liu, Naixue Xiong, Kefeng Wu, Tai-Hoon Kim
The Shipboard Automatic Identification System (AIS) is crucial for navigation safety and maritime surveillance, data mining and pattern analysis of AIS information have attracted considerable attention in terms of both basic research and practical applications. Clustering of spatio-temporal AIS trajectories can be used to identify abnormal patterns and mine customary route data for transportation safety. Thus, the capacities of navigation safety and maritime traffic monitoring could be enhanced correspondingly...
August 4, 2017: Sensors
https://www.readbyqxmd.com/read/28774650/rapid-anatomical-brain-imaging-using-spiral-acquisition-and-an-expanded-signal-model
#17
Lars Kasper, Maria Engel, Christoph Barmet, Maximilian Haeberlin, Bertram J Wilm, Benjamin E Dietrich, Thomas Schmid, Simon Gross, David O Brunner, Klaas E Stephan, Klaas P Pruessmann
We report the deployment of spiral acquisition for high-resolution structural imaging at 7T. Long spiral readouts are rendered manageable by an expanded signal model including static off-resonance and B0 dynamics along with k-space trajectories and coil sensitivity maps. Image reconstruction is accomplished by inversion of the signal model using an extension of the iterative non-Cartesian SENSE algorithm. Spiral readouts up to 25 ms are shown to permit whole-brain 2D imaging at 0.5 mm in-plane resolution in less than a minute...
July 31, 2017: NeuroImage
https://www.readbyqxmd.com/read/28774468/knee-joint-kinematics-and-kinetics-during-the-hop-and-cut-after-soft-tissue-artifact-suppression-time-to-reconsider-acl-injury-mechanisms
#18
Kenneth B Smale, Brigitte M Potvin, Mohammad S Shourijeh, Daniel L Benoit
The recent development of a soft tissue artifact (STA) suppression method allows us to re-evaluate the tibiofemoral kinematics currently linked to non-contact knee injuries. The purpose of this study was therefore to evaluate knee joint kinematics and kinetics in six degrees of freedom (DoF) during the loading phases of a jump lunge and side cut using this in silico method. Thirty-five healthy adults completed these movements and their surface marker trajectories were then scaled and processed with OpenSim's inverse kinematics (IK) and inverse dynamics tools...
July 8, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28773171/generalized-gw-boltzmann-approach-for-the-description-of-ultrafast-electron-dynamics-in-topological-insulators
#19
Marco Battiato, Irene Aguilera, Jaime Sánchez-Barriga
Quantum-phase transitions between trivial insulators and topological insulators differ from ordinary metal-insulator transitions in that they arise from the inversion of the bulk band structure due to strong spin-orbit coupling. Such topological phase transitions are unique in nature as they lead to the emergence of topological surface states which are characterized by a peculiar spin texture that is believed to play a central role in the generation and manipulation of dissipationless surface spin currents on ultrafast timescales...
July 17, 2017: Materials
https://www.readbyqxmd.com/read/28764413/fisher-information-and-r%C3%A3-nyi-entropies-in-dynamical-systems
#20
B Godó, Á Nagy
The link between the Fisher information and Rényi entropies is explored. The relationship is based on a thermodynamical formalism based on Fisher information with a parameter, β, which is interpreted as the inverse temperature. The Fisher heat capacity is defined and found to be sensitive to changes of higher order than the analogous quantity in the conventional formulation.
July 2017: Chaos
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