2,678 results match your criteria describing motion


ECG Patient Simulator Based on Mathematical Models.

Sensors (Basel) 2022 Jul 30;22(15). Epub 2022 Jul 30.

Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Queretaro 76230, Mexico.

In this work, we propose a versatile, low-cost, and tunable electronic device to generate realistic electrocardiogram (ECG) waveforms, capable of simulating ECG of patients within a wide range of possibilities. A visual analysis of the clinical ECG register provides the cardiologist with vital physiological information to determine the patient's heart condition. Because of its clinical significance, there is a strong interest in algorithms and medical ECG measuring devices that acquire, preserve, and process ECG recordings with high fidelity. Read More

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Near-Real-Time Strong Motion Acquisition at National Scale and Automatic Analysis.

Sensors (Basel) 2022 Jul 29;22(15). Epub 2022 Jul 29.

SeisRaM Working Group, Department of Mathematics and Geosciences, University of Trieste, Via Eduardo Weiss 4, 34128 Trieste, Italy.

A strong motion monitoring network records data that provide an excellent way to study how source, path, and site effects influence the ground motion, specifically in the near-source area. Such data are essential for updating seismic hazard maps and consequently building codes and earthquake-resistant design. This paper aims to present the Italian Strong Motion Network (RAN), describing its current status, employment, and further developments. Read More

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Theory of magnetic-field effect on trions in two-dimensional materials.

J Chem Phys 2022 Jul;157(4):044104

Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan.

In this work, we present a theoretical method to study the effect of magnetic field on trions in two-dimensional materials. The trion is modeled by a three-particle Schrödinger equation and the magnetic-field interaction is included by means of a vector potential in symmetric gauge. By using a coordinate transformation and a unitary transformation, the trion Hamiltonian can be converted into the sum of a translational term describing the Landau quantization for the trion center-of-mass motion, an internal term describing the trion binding, and a translational-internal coupling term depending linearly on the magnetic-field strength. Read More

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Ionic Dynamics and Vibrational Spectral Diffusion of a Protic Alkylammonium Ionic Salt through Intrinsic Cationic N-H Vibrational Probe from FPMD Simulations.

J Phys Chem A 2022 Aug 28;126(31):5134-5147. Epub 2022 Jul 28.

Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy 502284, Telangana, India.

We employed density functional theory (DFT)-based molecular dynamics simulations to explore the structure, dynamics, and spectral properties of the protic ionic entity trimethylammonium chloride (TMACl). Structural investigations include calculating the site-site radial distribution functions (RDFs), the distribution of constituent cations and anions in three-dimensional space, and combined distribution functions of the hydrogen-bonded pair RDF versus angle, revealing the structural characteristics of the ionic solvation and the intermolecular interactions within ions. Further, we determined the instantaneous vibrational stretching frequencies of the intrinsic N-H stretch probe modes by applying the time-series wavelet method. Read More

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Dielectrophoresis from the System's Point of View: A Tale of Inhomogeneous Object Polarization, Mirror Charges, High Repelling and Snap-to-Surface Forces and Complex Trajectories Featuring Bifurcation Points and Watersheds.

Micromachines (Basel) 2022 Jun 26;13(7). Epub 2022 Jun 26.

Independent Researcher, HaPrachim 19, Ra'anana 4339963, Israel.

Microscopic objects change the apparent permittivity and conductivity of aqueous systems and thus their overall polarizability. In inhomogeneous fields, dielectrophoresis (DEP) increases the overall polarizability of the system by moving more highly polarizable objects or media to locations with a higher field. The DEP force is usually calculated from the object's point of view using the interaction of the object's induced dipole or multipole moments with the inducing field. Read More

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HINT1 Neuropathy: expanding the genotype and phenotype spectrum.

Clin Genet 2022 Jul 26. Epub 2022 Jul 26.

APHM, CHU Timone, Département de Génétique Médicale, Marseille, France.

Inherited peripheral neuropathy (IPN) is a heterogeneous group of disorders due to pathogenic variation in more than 100 genes. In 2012, the first cases of IPN associated with HINT1 pathogenic variations were described in 33 families sharing the same phenotype characterized by an axonal neuropathy with neuromyotonia and autosomal recessive inheritance (NMAN : OMIM #137200). Histidine Triad Nucleotide Binding Protein 1 regulates transcription, cell-cycle control, and is possibly involved in neuropsychiatric pathophysiology. Read More

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Extracellular vesicles through the blood-brain barrier: a review.

Fluids Barriers CNS 2022 Jul 25;19(1):60. Epub 2022 Jul 25.

Biomedical Imaging Center, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.

Extracellular vesicles (EVs) are particles naturally released from cells that are delimited by a lipid bilayer and are unable to replicate. How the EVs cross the Blood-Brain barrier (BBB) in a bidirectional manner between the bloodstream and brain parenchyma remains poorly understood. Most in vitro models that have evaluated this event have relied on monolayer transwell or microfluidic organ-on-a-chip techniques that do not account for the combined effect of all cellular layers that constitute the BBB at different sites of the Central Nervous System. Read More

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Andrew Context and Priorities for Health Systems Strengthening for Pain and Disability in Low- and Middle-Income Countries: A Secondary Qualitative Study and Content Analysis of Health Policies.

Health Policy Plan 2022 Jul 25. Epub 2022 Jul 25.

Curtin School of Allied Health and Curtin enAble Institute, Faculty of Health Sciences, Curtin University, Perth, Australia.

Musculoskeletal (MSK) health impairments contribute substantially to the pain and disability burden in low- and middle-income countries (LMICs), yet health systems strengthening (HSS) responses are nascent. We aimed to explore the contemporary context, framed as challenges and opportunities, for improving population-level prevention and management of MSK health in LMICs using secondary qualitative data from a previous study exploring HSS priorities for MSK health globally; and (2) to contextualize these findings through an analysis of health policies for integrated management of noncommunicable diseases (NCDs) in select LMICs. Part 1: 12 transcripts of interviews with LMIC-based key informants (KIs) were inductively analysed. Read More

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First Language Matters: Event-Related Potentials Show Crosslinguistic Influence on the Processing of Placement Verb Semantics.

Front Psychol 2022 7;13:815801. Epub 2022 Jul 7.

Centre for Languages and Literature, Lund University, Lund, Sweden.

Second language (L2) learners experience challenges when word meanings differ across L1 and L2, and often display crosslinguistic influence (CLI) in speech production. In contrast, studies of online comprehension show more mixed results. Therefore, this study explored how L2 learners process fine-grained L2 verb semantics in the domain of caused motion (placement) and specifically the impact of having similar vs. Read More

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Critical dynamics of the antiferromagnetic O(3) nonlinear sigma model with conserved magnetization.

Phys Rev E 2022 Jun;105(6-1):064128

Department of Physics & Center for Soft Matter and Biological Physics, MC 0435, Robeson Hall, 850 West Campus Drive, Virginia Tech, Blacksburg, Virginia 24061, USA.

We study the near-equilibrium critical dynamics of the O(3) nonlinear sigma model describing isotropic antiferromagnets with a nonconserved order parameter reversibly coupled to the conserved total magnetization. To calculate response and correlation functions, we set up a description in terms of Langevin stochastic equations of motion, and their corresponding Janssen-De Dominicis response functional. We find that in equilibrium, the dynamics is well-separated from the statics, at least to one-loop order in a perturbative treatment with respect to the static and dynamical nonlinearities. Read More

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Semantic Correlation Attention-Based Multiorder Multiscale Feature Fusion Network for Human Motion Prediction.

IEEE Trans Cybern 2022 Jul 15;PP. Epub 2022 Jul 15.

Human motion prediction is to predict future human states based on the observed human states. However, current research ignores the semantic correlations between body parts (joints and bones) in the observed human states and motion time; thus, the prediction accuracy is limited. To address this issue, we propose a novel semantic correlation attention-based multiorder multiscale feature fusion network (SCAFF), which includes an encoder and a decoder. Read More

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Gastrocnemius release is an effective management option for Achilles tendinopathy: a systematic review.

Knee Surg Sports Traumatol Arthrosc 2022 Jul 11. Epub 2022 Jul 11.

Department of Trauma and Orthopaedic Surgery, University Hospitals of Leicester NHS Trust, Leicester, UK.

Purpose: This systematic review aims to summarise the outcomes of gastrocnemius release in the management of Achilles Tendinopathy.

Methods: A systematic review was performed according to PRISMA guidelines. A computer-based search was performed in PubMed, Embase, Cinahl, Scopus and ISI Web of Science. Read More

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A Geometric Approach for Real-Time Forward Kinematics of the General Stewart Platform.

Sensors (Basel) 2022 Jun 26;22(13). Epub 2022 Jun 26.

School of Intelligent Systems Engineering, Sun Yat-sen University, Guangzhou 510275, China.

This paper presents a geometric approach for real-time forward kinematics of the general Stewart platform, which consists of two rigid bodies connected by six general serial manipulators. By describing the rigid-body motion as exponential of twist, and taking advantage of the product of exponentials formula, a step-by-step derivation of the proposed algorithm is presented. As the algorithm naturally solves all passive joint displacements, the correctness is then verified by comparing the forward-kinematic solutions from all chains. Read More

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Representation of motion concepts in occipitotemporal cortex: fMRI activation, decoding and connectivity analyses.

Neuroimage 2022 Oct 4;259:119450. Epub 2022 Jul 4.

School of Philosophy, Psychology & Language Sciences, University of Edinburgh, UK. Electronic address:

Embodied theories of semantic cognition predict that brain regions involved in motion perception are engaged when people comprehend motion concepts expressed in language. Left lateral occipitotemporal cortex (LOTC) is implicated in both motion perception and motion concept processing but prior studies have produced mixed findings on which parts of this region are engaged by motion language. We scanned participants performing semantic judgements about sentences describing motion events and static events. Read More

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October 2022

Shoulder Pain and Injury after COVID-19 Vaccination.

Authors:
Dipit Sahu

Yale J Biol Med 2022 06 30;95(2):217-220. Epub 2022 Jun 30.

Mumbai Shoulder Institute, Mumbai, India.

Shoulder injury related to vaccine administration (SIRVA) is a term given to describe shoulder pain and dysfunction arising within 48 hours after vaccine administration and lasting for more than one week. While SIRVA is most commonly seen after influenza and tetanus vaccines, there have been a few recent case reports describing SIRVA-like symptoms after COVID-19 vaccine administration. Two patients presented to the shoulder surgeon's practice center with complaints of shoulder stiffness and pain following the COVID-19 vaccine. Read More

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Design - a new way to look at old molecules.

J Integr Bioinform 2022 Jul 1;19(2). Epub 2022 Jul 1.

Laboratoire de Biochimie Théorique, CNRS, Université Paris Cité, UPR 9080, 13 rue Pierre et Marie Curie, F-75005, Paris, France.

We discuss how design enriches molecular science, particularly structural biology and bioinformatics. We present two use cases, one in academic practice and the other to design for outreach. The first case targets the representation of ion channels and their dynamic properties. Read More

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Use of autobiographical stimuli as a mood manipulation procedure: Systematic mapping review.

PLoS One 2022 27;17(6):e0269381. Epub 2022 Jun 27.

Department of Psychology, Faculty of Medicine, University of Castilla-La Mancha, Albacete, Spain.

Background: In recent years, mood induction procedures have been developed in experimental settings that are designed to facilitate studying the impact of mood states on biological and psychological processes. The aim of the present study was to conduct a systematic mapping review with the intention of describing the state of the art in the use of different types of autobiographical stimuli for mood induction procedures.

Methods: Based on a search for publications from the period 2000-2021, conducted in four recognised databases (Scopus, Medline (PubMed), PsycINFO and Web of Science), we analysed a total of 126 published articles. Read More

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Spontaneous Movement of a Droplet on a Conical Substrate: Theoretical Analysis of the Driving Force.

ACS Omega 2022 Jun 7;7(24):20975-20982. Epub 2022 Jun 7.

Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China.

Experiments and simulations have shown that a droplet can move spontaneously and directionally on a conical substrate. The driving force originating from the gradient of curvatures is revealed as the self-propulsion mechanism. Theoretical analysis of the driving force is highly desirable; currently, most of them are based on a perturbative theory with assuming a weakly curved substrate. Read More

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Current Status of the X + CH [X ≡ H, F(P), Cl(P), O(P), OH] Hydrogen Abstraction Reactions: A Theoretical Review.

Molecules 2022 Jun 11;27(12). Epub 2022 Jun 11.

Departamento de Química Física and Instituto de Computación Científica Avanzada, Universidad de Extremadura, 06071 Badajoz, Spain.

This paper is a detailed review of the chemistry of medium-size reactive systems using the following hydrogen abstraction reactions with ethane, X + CH → HX + CH; X ≡ H, F(P), Cl(P), O(P) and OH, and focusing attention mainly on the theoretical developments. These bimolecular reactions range from exothermic to endothermic systems and from barrierless to high classical barriers of activation. Thus, the topography of the reactive systems changes from reaction to reaction with the presence or not of stabilized intermediate complexes in the entrance and exit channels. Read More

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Automated Movement Analysis to Predict Cerebral Palsy in Very Preterm Infants: An Ambispective Cohort Study.

Children (Basel) 2022 Jun 7;9(6). Epub 2022 Jun 7.

Division of Neonatology, Department of Paediatrics, University of Toronto, Toronto, ON M5G 1X8, Canada.

The General Movements Assessment requires extensive training. As an alternative, a novel automated movement analysis was developed and validated in preterm infants. Infants < 31 weeks' gestational age or birthweight ≤ 1500 g evaluated at 3-5 months using the general movements assessment were included in this ambispective cohort study. Read More

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Anharmonic Coupling of Stretching Vibrations in Ice: A Periodic VSCF and VCI Description.

J Chem Theory Comput 2022 Jul 23;18(7):4428-4437. Epub 2022 Jun 23.

Department of Chemistry, University of Vermont, 82 University Place, Burlington, Vermont 05405, United States of America.

The anharmonicity of O-H stretching vibrations of water ice is characterized by use of a periodic implementation of the vibrational self-consistent field (VSCF) and vibrational configuration interaction (VCI) methods, which take phonon-phonon couplings explicitly into account through numerical evaluation of high-order terms of the nuclear potential. The low-temperature, proton-ordered phase of water ice (namely, ice XI) is investigated. The net effect of a coupled anharmonic treatment of stretching modes is not just a rigid blue-shift of the respective harmonic spectral frequencies but rather a complex change of their relative spectral positions, which cannot be captured by simple scaling strategies based on harmonic calculations. Read More

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Nonequilibrium master equation for interacting Brownian particles in a deep-well periodic potential.

Phys Rev E 2022 May;105(5-1):054150

Department of Physics, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand.

Employing a creation and annihilation operator formulation, we derive an approximate many-body master equation describing discrete hopping from the more general continuous description of Brownian motion on a deep-well nonequilibrium periodic potential. The many-body master equation describes interactions of arbitrary strength and range arising from a "top-hat" two-body interaction potential. We show that this master equation reduces to the well-known asymmetric simple exclusion process and the zero range process in certain regimes. Read More

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Controlling energy conservation in quantum dynamics with independently moving basis functions: Application to multi-configuration Ehrenfest.

J Chem Phys 2022 May;156(20):204121

Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, Ontario M1C 1A4, Canada.

Application of the time-dependent variational principle to a linear combination of frozen-width Gaussians describing the nuclear wavefunction provides a formalism where the total energy is conserved. The computational downside of this formalism is that trajectories of individual Gaussians are solutions of a coupled system of differential equations, limiting implementation to serial propagation algorithms. To allow for parallelization and acceleration of the computation, independent trajectories based on simplified equations of motion were suggested. Read More

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Determining Objective Parameters to Assess Gait Quality in Franches-Montagnes Horses for Ground Coverage and Over-Tracking - Part 1: At Walk.

J Equine Vet Sci 2022 Aug 29;115:104024. Epub 2022 May 29.

Equine Department, Vetsuisse Faculty University of Zurich, Zurich, Switzerland.

Ground coverage and over-tracking are two gait quality traits describing the forward movement of the front respectively the hind limbs in relation to stride length and over-tracking distance. To investigate the complex interplay of different movement patterns in ground coverage and over-tracking, limb and body kinematics of 24 Franches-Montagnes (FM) stallions were measured with 3D optical motion capture (OMC) on a treadmill during an incremental speed test at the walk (1.4-2. Read More

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Excess Entropy Scaling in Active-Matter Systems.

J Phys Chem Lett 2022 Jun 31;13(22):4949-4954. Epub 2022 May 31.

Department of Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States.

Active-matter systems feature discrete particles that can convert stored or ambient free energy into motion. To realize the engineering potential of active matter, there is a strong need for predictive and theoretically grounded techniques for describing transport in these systems. In this work, we perform molecular-dynamics (MD) simulations of a model active-matter system, in which we vary the total fraction of active particles (0. Read More

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Simulation-Aided Handover Prediction From Video Using Recurrent Image-to-Motion Networks.

IEEE Trans Neural Netw Learn Syst 2022 May 30;PP. Epub 2022 May 30.

Recent advances in deep neural networks have opened up new possibilities for visuomotor robot learning. In the context of human-robot or robot-robot collaboration, such networks can be trained to predict future poses and this information can be used to improve the dynamics of cooperative tasks. This is important, both in terms of realizing various cooperative behaviors, and for ensuring safety. Read More

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Speaking and gesturing guide event perception during message conceptualization: Evidence from eye movements.

Cognition 2022 08 23;225:105127. Epub 2022 May 23.

Centre for Language Studies, Radboud University, Erasmusplein 1, 6525, HT, Nijmegen, the Netherlands; Max Planck Institute for Psycholinguistics, Wundtlaan 1, 6525, XD, Nijmegen, the Netherlands; Donders Institute for Brain, Cognition and Behaviour, Heyendaalseweg, 135 6525, AJ, Nijmegen, the Netherlands. Electronic address:

Speakers' visual attention to events is guided by linguistic conceptualization of information in spoken language production and in language-specific ways. Does production of language-specific co-speech gestures further guide speakers' visual attention during message preparation? Here, we examine the link between visual attention and multimodal event descriptions in Turkish. Turkish is a verb-framed language where speakers' speech and gesture show language specificity with path of motion mostly expressed within the main verb accompanied by path gestures. Read More

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Estimating curvilinear self-motion from optic flow with a biologically inspired neural system.

Bioinspir Biomim 2022 06 9;17(4). Epub 2022 Jun 9.

Department of Cognitive Science, Rensselaer Polytechnic Institute, Troy, NY, United States of America.

Optic flow provides rich information about world-relative self-motion and is used by many animals to guide movement. For example, self-motion along linear, straight paths without eye movements, generates optic flow that radiates from a singularity that specifies the direction of travel (heading). Many neural models of optic flow processing contain heading detectors that are tuned to the position of the singularity, the design of which is informed by brain area MSTd of primate visual cortex that has been linked to heading perception. Read More

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Extracting the Dynamic Motion of Proteins Using Normal Mode Analysis.

Methods Mol Biol 2022 ;2449:213-231

Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava, Slovakia.

Normal mode analysis (NMA) is a technique for describing the conformational states accessible to a protein in a minimum energy conformation. NMA gives results similar to those produced by principal components analysis of a molecular dynamics simulation, but with only a fraction of the computational effort. Here, we provide a brief overview of the theory and describe three methods for carrying out NMA, including the use of one of the on-line services, the use of off-line software for calculating the projection of the modes calculated from one conformation onto another, and an all-atom NMA calculated using GROMACS. Read More

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January 2022

Observation of Bloch oscillations dominated by effective anyonic particle statistics.

Nat Commun 2022 May 2;13(1):2392. Epub 2022 May 2.

Key Laboratory of advanced optoelectronic quantum architecture and measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, 100081, Beijing, China.

Bloch oscillations are exotic phenomena describing the periodic motion of a wave packet subjected to an external force in a lattice, where a system possessing single or multiple particles could exhibit distinct oscillation behaviors. In particular, it has been pointed out that quantum statistics could dramatically affect the Bloch oscillation even in the absence of particle interactions, where the oscillation frequency of two pseudofermions with an anyonic statistical angle of [Formula: see text] becomes half of that for two bosons. However, these statistically dependent Bloch oscillations have never been observed in experiments until now. Read More

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