Search results for "Flow"

Computation of flow velocity in gravel bed channels

2002

Accurate estimate of flow-velocity profile is of crucial importance both for scientific purposes and for solving numerous engineering problems that include, among others, sediment transport, contaminant transport, flow resistance evaluation. This paper presents a new empirical equation to represent the vertical velocity profile. The proposed equation is essentially a modified form of the well-known logarithm law of the wall and contains three parameters having a clear physical meaning. The applicability of the equation and its accuracy assessment for different hydraulic conditions, including non-uniform conditions, is verified by using experimental data obtained by different sources. The va…

DENTAL 3D DIGITAL WORKFLOW USING AN OPEN-SOURCE 3D SOFTWARE PROGRAM

2022

Optical flow estimation from multichannel spherical image decomposition

2011

International audience; The problem of optical flow estimation is largely discussed in computer vision domain for perspective images. It was also proven that, in terms of optical flow analysis from these images, we have difficulty distinguishing between some motion fields obtained with little camera motion. The omnidirectional cameras provided images with large filed of view. These images contain global information about motion and allow to remove the ambiguity present in perspective case. Nevertheless, these images contain significant radial distortions that is necessary to take into account when treating these images to estimate the motion. In this paper, we shall describe new way to comp…

An Advanced Numerical Method for Recovering Image Velocity Vectors Field

2005

A Comparative Study of Block Matching Optical Flow Algorithms

2017

TEM Journal; Vol 6, No 4, 2017. ISSN 2217-8309

3-4 gadīgu bērnu optimālās pieredzes izjūtas attīstības kritēriju aprobācija mūzikas nodarbībās

2019

Optimālu pieredzes izjūtu nosaka līdzsvars starp darbībā izjustu izaicinājumu un prasmēm to risināt, kā arī skaidra tuvākā mērķa izpratne un iespēja gūt acumirklīgu atgriezenisko saiti. Optimāla pieredzes izjūta saistīta ar cilvēka iekšēji motivētu darbību, jo indivīda vēlme atkal izjust darbības un apziņas saplūšanu, fokusētu prāta stāvokli, kam netraucē ārēji impulsi, un gandarījumu par savu prasmju attīstību motivē cilvēku atkal atrast pietiekamu izaicinājumu. Dace Sloka par sava kvalifikācijas darba „3-4 gadīgu bērnu optimālas pieredzes izjūtas attīstības kritēriju aprobācija mūzikas nodarbībās” pētījuma mērķi izvirza teorētiski un empīriski pētīt 3 – 4 gadus vecu bērnu optimālas piered…

Examining Open Innovation in Science (OIS): what Open Innovation can and cannot offer the science of science

2021

Scholars across disciplines increasingly hear calls for more open andcollaborative approaches to scientific research. The concept of OpenInnovation in Science (OIS) provides a framework that integratesdispersed research efforts aiming to understand the antecedents,contingencies, and consequences of applying open and collaborativeresearch practices. While the OIS framework has already been taken upby science of science scholars, its conceptual underpinnings requirefurther specification. In this essay, we critically examine the OIS conceptand bring to light two key aspects: 1) how OIS builds upon OpenInnovation (OI) research by adopting its attention to boundary-crossingknowledge flows and by…

Stationary sets and asymptotic behavior of the mean curvature flow with forcing in the plane

2020

We consider the flat flow solutions of the mean curvature equation with a forcing term in the plane. We prove that for every constant forcing term the stationary sets are given by a finite union of disks with equal radii and disjoint closures. On the other hand for every bounded forcing term tangent disks are never stationary. Finally in the case of an asymptotically constant forcing term we show that the only possible long time limit sets are given by disjoint unions of disks with equal radii and possibly tangent. peerReviewed

Stationary sets of the mean curvature flow with a forcing term

2020

We consider the flat flow approach for the mean curvature equation with forcing in an Euclidean space $\mathbb R^n$ of dimension at least 2. Our main results states that tangential balls in $\mathbb R^n$ under any flat flow with a bounded forcing term will experience fattening, which generalizes the result by Fusco, Julin and Morini from the planar case to higher dimensions. Then, as in the planar case, we are able to characterize stationary sets in $\mathbb R^n$ for a constant forcing term as finite unions of equisized balls with mutually positive distance.

Volume preserving mean curvature flows near strictly stable sets in flat torus

2021

In this paper we establish a new stability result for the smooth volume preserving mean curvature flow in flat torus $\mathbb T^n$ in low dimensions $n=3,4$. The result says roughly that if the initial set is near to a strictly stable set in $\mathbb T^n$ in $H^3$-sense, then the corresponding flow has infinite lifetime and converges exponentially fast to a translate of the strictly stable (critical) set in $W^{2,5}$-sense.