Results 191 to 200 of about 2,720,434 (244)

The fractional Fourier transform and time-frequency representations

IEEE Transactions on Signal Processing, 1994
The functional Fourier transform (FRFT), which is a generalization of the classical Fourier transform, was introduced a number of years ago in the mathematics literature but appears to have remained largely unknown to the signal processing community, to ...
L. B. Almeida
semanticscholar   +1 more source

Codman's paradox of the arm rotations is not a paradox: mathematical validation

Medical Engineering & Physics, 1998
Movement of a straight arm centred at the shoulder joint in three successive 90 degrees rotations, each around the respective orthogonal coordinate axis, leads to an apparently unrelated 90 degrees rotation around the longitudinal arm axis. This empirical fact is known as Codman's paradox, after a Bostonian surgeon who first reported it in 1934 ...
Orlando Bravo, J.C. Politti, Gustavo Goroso, Max E. Valentinuzzi   +3 more
openaire   +3 more sources

A mathematical modeling of rotating waves in axial and radial compressors

Archive of Applied Mechanics, 1996
A comparison between meteorological systems and fluid motions through compressors is proposed. A mathematical analysis analogous to the geophysical one emphasizes characteristic dimensions. A dimensionless kinematic parameter, akin to the Rossby number, emerges, and thus leads to the study of different cases.
P. A. Bois, H. Cornille
openaire   +2 more sources

A Structural Equation Model Explaining 8th Grade Students' Mathematics Achievements.

, 2014
The purpose of this study is to investigate, via a model, the explanatory and predictive relationships among the following variables: Mathematical Problem Solving and Reasoning Skills, Sources of Mathematics Self-Efficacy, Spatial Ability, and ...
E. Yurt, Ali Murat Sünbül
semanticscholar   +1 more source

A mathematical model of pulse plating on a rotating disk electrode

AIChE Journal, 1990
AbstractA galvanostatic pulse plating model is presented for the electrodeposition of an alloy on a rotating disk electrode. This model is used to simulate the electrodeposition of nickel/chrome alloys. The mass transport equations used in the model include the effects of diffusion, migration and convection; and the electrode kinetics are described by ...
Yin, Ken-Ming, White, Ralph E.
openaire   +2 more sources

From Tesla to Tetris: Mental Rotation, Vocation, and Gifted Education

, 2013
Mental rotation ability is important for success in a number of academic and career fields, especially the science, technology, engineering, and mathematics (STEM) domains.
Catya von Károlyi
semanticscholar   +1 more source

Mathematical model of the cylinder rotations in a viscous medium

AIP Conference Proceedings, 2014
In the paper movement of a rotating cylinder in a viscous medium is considered. Control law provides given position of the cylinder at the finite time minimizing the work of the drag forces to rotation is found. In the case when the control force is applied in the direction of the axis of symmetry the problem is singular.
openaire   +2 more sources

The Role of Kinetic Effects, Including Plasma Rotation and Energetic Particles, in Resistive Wall Mode Stability

, 2009
particles, in resistive wall mode stability J.W. Berkery1, S.A. Sabbagh1, R. Betti2, B. Hu2, R.E. Bell3, S.P. Gerhardt3, J. Manickam3, and M. Podesta3 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 ...
J. Berkery
semanticscholar   +1 more source

The role of 2D and 3D mental rotation in mathematics for young children: what is it? Why does it matter? And what can we do about it?

Zdm, 2015
Catherine D. Bruce, Zachary C K Hawes
semanticscholar   +2 more sources

Hydrodynamics in a Rotating Packed Bed. II. A Mathematical Model

Industrial & Engineering Chemistry Research, 2012
A mathematical model for air–liquid two-phase flow in rotating packed beds (RPB) is established to describe the real condition of the fluid flow in the RPB. Results show that the model can better and reasonably predict the distribution of the air–liquid two-phase flow field, the pressure drop, the liquid film thickness, the proportion of the turbulent ...
Qi Ruan, Zuo-yi Yan, Cheng Lin
openaire   +2 more sources