Science topics: PsychophysicsMotion

Science topic

# Motion - Science topic

Physical motion, i.e., a change in position of a body or subject as a result of an external force. It is distinguished from MOVEMENT, a process resulting from biological activity.

Publications related to Motion (10,000)

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In this paper, stochastic planar stick–slip motions are investigated using a slider-on-belt model where the coefficient of friction (COF) of the contact interface is modelled as a random field. New three-variable stick–slip transition criteria are proposed to improve the accuracy and robustness of the algorithm. Stochastic analyses are performed co...

Efficient and accurate chatter prediction is essential for selection of chatter-free process parameters in order to improve machining productivity and surface quality of the workpiece. This paper proposes a five-point Gaussian quadrature-based chatter prediction method of milling processes together with a transition matrix reduction scheme to impro...

This study proposes a method for modelling the flow interaction of multiple moving objects where the flow field variables are communicated between multiple separate moving computational domains. Instead of using the conventional approach with a single fixed computational domain covering the whole flow field, this method advances the moving computat...

Underwater soft-link manipulators can be applied in offshore and marine industries. However, the soft-body link may interact with the fluid flow in this type of coupled liquid-link system. Both frequencies and mode shapes of the coupled system differ from those of uncoupled link vibrations and water flow due to the liquid-link interaction. Therefor...

Introduction
The purpose of this study was to evaluate factors that affect range of motion (ROM) following two-stage revision arthroplasty as a treatment for chronic periprosthetic knee infection.
Materials and methods
A total of 98 patients diagnosed with chronic periprosthetic joint infection (PJI) following primary total knee arthroplasty betwe...

Background
Legg–Calvé–Perthes Disease (LCPD) is a necrosis of the femoral head which affects the range of motion of the hips. Its incidence is variable, ranging from 0.4/100,000 to 29.0/ 100,000 children. Although LCPD was first described in the beginning of the past century, limited is known about its etiology. Our objective is to describe the mai...

Background
Haemophilic arthropathy (HA), a common complication of haemophilia, is secondary to recurrent joint bleeding and increases the prevalence of end-stage osteoarthritis (OA). Total knee arthroplasty (TKA) is a reliable treatment for haemophilia patients. This study was performed to evaluate the mid-term outcomes of TKA for end-stage HA. We...

A problem of motion of a piezoelectric actuator in contact with an elasto-plastic obstacle is reformulated as a PDE in one spatial dimension with hysteresis in the bulk and on the contact boundary. The model is shown to dissipate energy in agreement with the principles of thermodynamics. The main result includes existence, uniqueness, and continuou...

The experimental results of Xia and Steen for the contact line dynamics of a drop placed on a vertically oscillating surface are analyzed by numerical phase field simulations. The concept of contact line mobility or friction is discussed, and an angle-dependent model is formulated. The results of numerical simulations based on this model are compar...

Pore pressure plays a critical role in the hypermobility mechanism of landslides. In coseismic landslides, earthquake can further influence the variation of pore pressure. Among these factors, the dominant factor to explain the hypermobility mechanism of such coseismic landslides remains unknown. In this paper, considering the seismic loading and t...

We set up general equations of motion for point vortex systems on closed Riemannian surfaces, allowing for the case that the sum of vorticities is not zero and there hence must be counter-vorticity present. The dynamics of global circulations which is coupled to the dynamics of the vortices is carefully taken into account. Much emphasis is put to t...

Compliant mechanisms with corrugated flexure units have been attracting increasing attention due to their large range of motion. However, most research has considered in-plane compliance, whereas the out-of-plane performance, which affects the load-carrying ability, has seldom been studied. In this paper, an analytical model for the spatial complia...

Visual object tracking is a complicated problem due to varied challenges such as occlusion, background clutter, target appearance changes, abrupt target motion, and illumination variations. Different tracking algorithms perform well on different challenges because of their unique strengths. In this paper, a dual‐integration framework that integrate...

Bird wings are frequently modelled in the aerodynamics literature under the assumption that they are static aerofoils. Air flows over real bird wings can violate this assumption, both because of the topology of the wing and the fact that real wings typically undergo flapping and twisting motions during flight. There are many computational and numer...

Chiari malformation Type 1 (CMI) is traditionally characterized as a descent of the cerebellar tonsils more than 5mm below the foramen magnum. In some patients with CMI, there is aberrant pulsatile movement of the tonsils downward during cardiac systole which can affect cerebrospinal fluid (CSF) flow at the foramen magnum. Here, we present an 18-ye...

Purpose of Review
Adrenal tumor surgery is routinely performed by minimal invasive surgery. We aim to over-view of updates on lateral approach for robotic adrenalectomy.
Recent Updates
In the era of robotic surgery with the feasibility and the ability to provide the surgeon of three-dimensional view, which allows maximum range of motion and precis...

We introduce the Study variety of conformal kinematics and investigate some of its properties. The Study variety is a projective variety of dimension ten and degree twelve in real projective space of dimension 15, and it generalizes the well-known Study quadric model of rigid body kinematics. Despite its high dimension, co-dimension, and degree it...

This paper addresses the main goal of using reset control in precision motion control systems, breaking of the well-known “Waterbed effect”. A new architecture for reset elements will be introduced which has a continuous output signal as opposed to conventional reset elements. A steady-state precision study is presented, showing the steady-state pr...

In cue-based recall from working memory, incorrectly reporting features of an uncued item may be referred to as a “swap” error. One account of these errors ascribes them to variability in memory for the cue features leading to erroneous selection of a non-target item, especially if it is similar to the target in the cue-feature dimension. However,...

In this study, we show that the quaternion product of quaternionic operator whose scalar part is a real parameter and vector part is a curve in R3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}...

This paper deals with the full gravitational N-body problem. We express the Newton–Euler equa- tions of motion into the Hamiltonian formalism employing a noncanonical Poisson structure. For this system, we identify the full-symmetry group given by the Galilean group. We carry out a partial reduction in two stages: translational and rotational symme...

In this paper, two often-employed alternatives to the semi-recursive method are described and compared in terms of velocity transformation. The text offers a simplified way to understand the theory behind the two semi-recursive approaches. Focusing on planar cases, particular attention is given to reference and joint coordinates. Consequently, a mu...

Objective
The purpose of this study was to evaluate the changes in mitral annular motion after surgery in patients with aortic stenosis.
Methods
Patients receiving Edwards (Edwards) valves were included in the study. Echocardiographic findings were compared among the three treatments postoperatively, at discharge, and at 1 year after the surgery....

Molecules in open systems may be modeled using so-called reduced descriptions that keep focus on the molecule while including the effects of the environment. Mathematically, the matrices governing the Markovian equations of motion for the reduced density matrix, such as the Lindblad and Redfield equations, belong to the family of non-normal matrice...

Ce papier est consacré à l'évaluation de la simulation de manoeuvrabilité de bateau par l'approche CFD avec l'accent mis sur un modèle simplifié de l'hélice pour lequel l'action de cette hélice est représentée par un champ de force dont la densité est déterminée par la charge du bateau pendant sa manoeuvre à l'aide de la courbe de performance de l'...

A simple analytical expression for the potential energy curve for the ground state $X^1\Sigma^+$ of the hydrogen fluoride molecule HF obtained in the framework of the Born-Oppenheimer approximation is proposed. This analytical expression for the potential energy curve is based in the two point Pad\'e approximation, which correctly reproduces the as...

Wearable pressure sensors having versatile device structures have been extensively investigated to achieve high sensitivity under mechanical stimuli. Here, we introduce piezoelectric pressure sensors based on fabrics woven using polyvinylidene fluoride (PVDF) weft and polyethylene terephthalate (PET) warp yarns with different weave structures: 1/1...

Recent political events in Romania (the removal of some ministers, the dissolution of the ruling coalition, the dismissal of the government by a motion of no confidence etc.) created a great deal of uncertainty regarding fiscal, monetary and legislative policy. T

These lecture notes are intended as a guide to Graduate level readers that are already familiar with basic General Relativity. They present in a concise way some advanced concepts and problems encountered in the study of gravitation. In these notes are covered: Alternates forms of the Schwarzschild Black Hole solution, including the classic Kruskal...

The resolution of the acceleration and jerk vectors of a particle moving on a space curve in the Euclidean 3-space is considered. By applying this resolution and Siacci’s theorem, alternative resolutions of acceleration and jerk vectors are derived based on the quasi-frame. In the osculating plane, the acceleration vector is resolved as the sum of...

We study quantum discord dynamic of two atomic qubits moving inside a leaky cavity, where the two-qubit system is driven by a classical field. We suppose that the qubits are coupled to each other through dipole-dipole interaction and interacting asymmetrically with the cavity field via a two-photon relaxation. Using the time-dependent Schrödinger e...

High dynamic range (HDR) imaging is a fundamental problem in image processing, which aims to generate well-exposed images, even in the presence of varying illumination in the scenes. In recent years, multi-exposure fusion methods have achieved remarkable results, which merge multiple low dynamic range (LDR) images, captured with different exposures...

: In this article, we study curvature inheritance symmetry in Ricci flat spacetimes. We show
that, if Ricci flat spacetimes are not of Petrov type N, and admit curvature inheritance symmetries,
then the only existing symmetries are conformal motions. We also prove that the only Ricci flat
spacetime that admits a proper curvature inheritance symmetr...

In this article, the motion of three degree-of-freedom (DOF) dynamical system consisting of a triple rigid body pendulum (TRBP) in the presence of three harmonically external moments is studied. In view of the generalized coordinates of the system, Lagrange's equations are used to obtain the governing system of equations of motion (EOM). The analyt...

For the development of muscle-machine interfaces (MuMIs), researchers have relied mainly on Electromyogra-phy (EMG) signals. However, these signals require complex hardware systems, as well as specialized signal processing and feature extraction methods. To overcome these issues, in our previous work, we proposed a novel MuMI for decoding human int...

Reliably predicting the motion of contestant vehicles surrounding an autonomous racecar is crucial for effective and performant planning. Although highly expressive, deep neural networks are black-box models, making their usage challenging in safety-critical applications, such as autonomous driving. In this paper, we introduce a structured way of f...

From the Lagrangian side of geometric mechanics, the dynamics, relative equilibria and stability analysis for a rigid spacecraft coupled with liquid propellant, flexible appendage and momentum wheel are studied. The liquid propellant nonlinear sloshing is equivalently modeled by a 3D rigid pendulum, which can effectively imitate the large-amplitude...

This study aimed to investigate the effect of breast mass and motion on lumbar flexor / extensor moments during running. Kinematic and kinetic data were collected for a female participant running at 2.6 m/s. An MRI scan was used to calculate breast mass and centre of mass location. An OpenSim model was customised with two point-mass segments added...

Human gait data have traditionally been recorded in controlled laboratory environments focusing on single aspects in isolation. In contrast, the database presented here provides recordings of everyday walk scenarios in a natural urban environment, including synchronized IMU−, FSR−, and gaze data. Twenty healthy participants (five females, fifteen m...

The energies of spin singlet and triplet bound electron pairs are reckoned for electrons interacting through the Coulomb interaction, while sitting on neigbouring lattice sites. It is concluded that triplet pairs are unlikely to be observed due to screening. The interplay of inter-electron couplings of different spatial range is investigated. High-...

High lying doubly excited states of the strontium atom are experimentally studied in the vicinity of the Sr$^+(N=5)$ threshold using resonant multiphoton isolated core excitation. Calculations based on configuration interaction with exterior complex scaling are used to analyze the complex spectra we recorded by treating the correlated motion of the...

Resumen
El poder mecánico es una variable de interés en la protección pulmonar, involucra la cantidad de energía que se disipa en el parénquima pulmonar en cada ciclo respiratorio por medio de cálculos derivados de la ecuación del movimiento respiratorio. Los estudios consultados asocian el poder mecánico a la mortalidad en pacientes con síndrome d...

Our aim is to develop a better understanding of how the Point of Release (PoR) of a ball affects the perception of animated throwing motions. We present the results of a perceptual study where participants viewed animations of a virtual human throwing a ball, in which the point of release was modified to be early or late. We found that errors in ov...

Schlieren imaging is a method of flow visualization that relies solely on the fluctuations in the indices of refraction of the fluid in motion. The imaging technique coupled with cross-correlation of successive images proves to be useful tool in estimating velocity values in a flow. The current study utilizes the changes in the indices of refractio...

An analytical expression is obtained to the mass of an isolated magnetic skyrmion and its linearized equation of motion. The magnetic skyrmion is viewed as a topologically protected spin-wave soliton in the magnetic ultrathin films stabilized by the interfacial-Dzyaloshinskii-Moriya interaction. The equations of motion are derived from the Landau-L...

This methodology paper proposes a novel and rapid automated motion artefact detection algorithm for electrodermal activity (EDA) data in dynamic environments. Building on a well validated shape-based artefact detection method, we improved the detection algorithm by adding an additional slope constraint. We also proposed a novel approach to account...

Humans have an extraordinary ability to communicate and read the properties of objects by simply watching them being carried by someone else. This level of communicative skills and interpretation, available to humans, is essential for collaborative robots if they are to interact naturally and effectively. For example, suppose a robot is handing ove...

In this paper, the theory of smooth action-dependent Lagrangian mechanics (also known as contact Lagrangians) is extended to a non-smooth context appropriate for collision problems. In particular, we develop a Herglotz variational principle for non-smooth action-dependent Lagrangians which leads to the preservation of energy and momentum at impacts...

We present Free-HeadGAN, a person-generic neural talking head synthesis system. We show that modeling faces with sparse 3D facial landmarks are sufficient for achieving state-of-the-art generative performance, without relying on strong statistical priors of the face, such as 3D Morphable Models. Apart from 3D pose and facial expressions, our method...

The purpose of the study was to collect experimental data on the vertical structure of sediment fluxes during the wave crest and trough phase. The first stage of the experimental work included measurements of these fluxes using the particle image method, while in the second stage, measurements of sediment transport rates and granulometric distribut...

A spinor representation of the generalized energy-momentum density 4-vector is proposed, and examples of such representations for various particles and fields are given. This representation corresponds to the classical representation of the particle's own rotation, which is described by the diagonal matrix of the moment of inertia. The concept of s...

Although the simple diffusion model can effectively describe the movement of eukaryotic cells on a culture surface observed at relatively low sampling frequency, at higher sampling rates more complex models are often necessary to better fit the experimental data. Currently available models can describe motion paths by involving additional parameter...

This study presents a peridynamic (PD) approach to model progressive failure in fiber steered composites. The force density vectors in the PD equation of motion are derived explicitly for in-plane, transverse normal and transverse shear deformations in terms of the engineering material constants. The PD bonds enable the interaction of material poin...

Leibniz proposed the "Most Determined Path Principle" in seventeenth century. According to it, "ease" of travel is the end purpose of motion. Using this principle and his calculus method he demonstrated Snell"s Laws of reflection and refraction. This method shows that light follows extremal (local minimum or maximum) time path in going from one poi...

This paper presents a new partial differential equation to build Brakke's motion, which is a weak notion of mean curvature flow. We call the equation a modified Allen-Cahn equation abbreviated to MAC. After that we introduce its benefit: An improved estimate on the discrepant energy that means the equipartition of the first energy. This equation is...

We describe our work on inferring the degrees of freedom between mated parts in mechanical assemblies using deep learning on CAD representations. We train our model using a large dataset of real-world mechanical assemblies consisting of CAD parts and mates joining them together. We present methods for re-defining these mates to make them better ref...

Context. In the past few years, there has been a rise in the detection of streamers, asymmetric flows of material directed toward the protostellar disk with material from outside the star's natal core. It is unclear how they affect the process of mass accretion, in particular beyond the Class 0 phase. Aims. We investigate the gas kinematics around...

The propagation of the modulated wave pattern and its instability in the nonlinear medium is an important study from where experimental results are obtained. In this work, we use the nonlinear Schrödinger equation (NLSE) with saturation nonlinearity which describes the solitonic waves in the molecular chain model. We set our study on the eﬀectivene...

In the understanding of primary bifurcating flows of a linear array of electromagnetically forced vortices in an experimental fluid motion, a theoretical study on the nonlinear instability is presented. The existence of the bifurcating flows is obtained from a Fourier mode perturbation. This large-scale perturbation, leading to the primary bifurcat...