Three-Dimensional Analysis of Handspring with Full Turn Vault: Deterministic Model, Coaches' Beliefs, and Judges' Scores

1998 ◽  
Vol 14 (2) ◽  
pp. 190-210 ◽  
Author(s):  
Yoshiaki Takei
Keyword(s):  
Kinetic Energy ◽  
Deterministic Model ◽  
Three Dimensional ◽  
Vertical Displacement ◽  
Angular Distance ◽  
Energy Term ◽  
Long Duration ◽  
Full Turn ◽  
Vertical Displacements ◽  
Kinetic Energy Term

The purpose of the study was to identify mechanical variables that govern successful performance of the handspring with full turn vault. Subjects were 67 male gymnasts from 25 countries performing the vault during the 1992 Olympic Games. The vaults were filmed by two 16-mm Locam II DC cameras operating at 100 Hz. Approximately 80 frames per subject were digitized for each camera view. Direct linear transformation (DLT) was used to calculate the 3-D coordinates of the digitized body points. The method of Hay and Reid (1988) was used to develop a theoretical model to identify the mechanical variables that determine linear and angular motions of the vault. Significant correlations (p< .005) indicated that the following were important determinants for success: large horizontal velocity, large horizontal kinetic energy term, and overall translational kinetic energy term at takeoff from the board; short duration, small vertical displacement of the center of gravity (CG), and small somersaulting angular distance of preflight; large vertical velocity and large vertical kinetic energy term at takeoff from the horse; and large "amplitude of postflight," that is, large horizontal and vertical displacements of CG and long duration of flight; great height of CG during the second quarter-tum in postflight; and small point deduction for landing.

The introduction of the quantum kinetic energy term via the Hamilton-Jacobi approach

2013 ◽  
Vol 128 (1) ◽  
Author(s):  
Maedeh Mollai ◽  
Mohammad Razavi ◽  
Safa Jami ◽  
Ali Ahanj
Keyword(s):  
Kinetic Energy ◽  
Energy Term ◽  
Kinetic Energy Term

scholarly journals STATEFINDER PARAMETERS FOR QUINTOM DARK ENERGY MODEL

2005 ◽  
Vol 14 (11) ◽  
pp. 1873-1881 ◽  
Author(s):  
PUXUN WU ◽  
HONGWEI YU
Keyword(s):  
Dark Energy ◽  
Kinetic Energy ◽  
Dark Energy Model ◽  
Scalar Fields ◽  
Energy Model ◽  
The Other ◽  
Energy Term ◽  
Statefinder Parameters ◽  
Energy Models ◽  
Kinetic Energy Term

We perform in this paper a statefinder diagnostic to a dark energy model with two scalar fields, called "quintom," where one of the scalar fields has a canonical kinetic energy term and the other has a negative one. Several kinds of potentials are discussed. Our results show that the statefinder diagnostic can differentiate quintom model with other dark energy models.

Comparative assesment of steady-state pipeline gas flow models / Analiza porównawcza modeli przepływu gazu w rurociągu w stanach ustalonych

2012 ◽  
Vol 57 (1) ◽  
pp. 23-38 ◽  
Author(s):  
Maciej Chaczykowski ◽  
Andrzej J. Osiadacz
Keyword(s):  
Steady State ◽  
Kinetic Energy ◽  
Gas Flow ◽  
Energy Equation ◽  
Momentum Equation ◽  
Analytical Models ◽  
Energy Term ◽  
Convective Term ◽  
Flow Models ◽  
Kinetic Energy Term

One-dimensional, non-isothermal flow of gas in a straight pipe has been considered to predict pressure and temperature profiles along the horizontal pipeline under steady-state conditions. Selected analytical models for the simplified calculation of these profiles are evaluated on the basis of the numerical solution of the accurate model, which incorporates the convective term in the momentum equation and the kinetic energy term in the energy equation, while treating the enthalpy as a function of pressure and temperature. For closure of the system of the conservation equations, the GERG 2004 equation of state was chosen. In order to present the discrepancies introduced by the models, the results of the numerical and analytical solutions are compared with the field data. The results show that in the case of the high pressure gas transmission system, the effects of the convective term in the momentum equation and the kinetic energy term in the energy equation are negligible for pipeline pressure and temperature calculation accuracies. It also indicates that real gas effects play an important role in the temperature distribution along the pipeline and cannot be neglected from the calculation when approximate analytical equations are used.

PD Controller for Manipulator with Kinetic Energy Term

2005 ◽  
Vol 44 (2) ◽  
pp. 107-121 ◽  
Author(s):  
Przemysław Herman
Keyword(s):  
Kinetic Energy ◽  
Pd Controller ◽  
Energy Term ◽  
Kinetic Energy Term

SELFCONSISTENT FUSION BARRIERS AT NEAR BARRIER ENERGIES

2004 ◽  
Vol 13 (01) ◽  
pp. 305-308 ◽  
Author(s):  
JANUSZ SKALSKI
Keyword(s):  
Kinetic Energy ◽  
Skyrme Force ◽  
Energy Term ◽  
Density Method ◽  
Hartree Fock ◽  
Error Cancellation ◽  
Kinetic Energy Term ◽  
Relative Kinetic ◽  
Q Values ◽  
Better Than

Fusion potentials are calculated for a number of reactions within the static Hartree-Fock method with the Skyrme force SkM*. Fusion barriers agree with the data considerably better than reaction Q values. This suggests some error cancellation, possibly with the relative kinetic energy term. Our results are consistent with the idea of fusion hindrance in tip collisions. Some comparison to results of the frozen density method is made.

Structure of the Baroclinic Tide Generated at Kaena Ridge, Hawaii

2006 ◽  
Vol 36 (6) ◽  
pp. 1123-1135 ◽  
Author(s):  
Jonathan D. Nash ◽  
Eric Kunze ◽  
Craig M. Lee ◽  
Thomas B. Sanford
Keyword(s):  
Kinetic Energy ◽  
Energy Flux ◽  
Internal Tide ◽  
Vertical Displacement ◽  
Kinetic Energy Density ◽  
Net Energy ◽  
Flux Divergence ◽  
Vertical Displacements ◽  
Baroclinic Tide ◽  
Velocity Pressure

Abstract Repeat transects of full-depth density and velocity are used to quantify generation and radiation of the semidiurnal internal tide from Kaena Ridge, Hawaii. A 20-km-long transect was sampled every 3 h using expendable current profilers and the absolute velocity profiler. Phase and amplitude of the baroclinic velocity, pressure, and vertical displacement were computed, as was the energy flux. Large barotropically induced isopycnal heaving and strong baroclinic energy-flux divergence are observed on the steep flanks of the ridge where upward and downward beams radiate off ridge. Directly above Kaena Ridge, strong kinetic energy density and weak net energy flux are argued to be a horizontally standing wave. The phasing of velocity and vertical displacements is consistent with this interpretation. Results compare favorably with the Merrifield and Holloway model.

A Three-Dimensional Analysis of the Men’s Compulsory Vault Performed at the 1992 Olympic Games

1996 ◽  
Vol 12 (2) ◽  
pp. 237-257 ◽  
Author(s):  
Yoshiaki Takei ◽  
Erik P. Blucker ◽  
J. Hubert Dunn ◽  
Scott A. Myers ◽  
Virginia L. Fortney
Keyword(s):  
Kinetic Energy ◽  
Dimensional Analysis ◽  
Vertical Velocity ◽  
Olympic Games ◽  
Three Dimensional ◽  
Center Of Gravity ◽  
Horizontal Velocity ◽  
Frame Rate ◽  
The Third ◽  
Full Turn

The 20 highest scored handspring with full-turn vaults performed during the 1992 Olympic Games were compared with those receiving the 20 lowest scores. Hypotheses were that the vaults receiving high scores would (a) demonstrate larger horizontal velocity at takeoff from the board and larger vertical velocity at takeoff from the horse and (b) demonstrate greater amplitude of postflight, higher center of gravity (CG) at the completion of the full twist, and superior landing performance than those receiving low scores. Two 16-mm Locam II DC cameras, each operating at a nominal frame rate of 100 Hz, recorded the vaults. It was concluded that the vaults receiving high scores demonstrated (a) larger horizontal velocity and translational kinetic energy at takeoff from the board, larger vertical velocity and translational kinetic energy at takeoff from the horse, and greater amplitude of postflight; (b) greater heights of CG from the beginning of the second-quarter twist to halfway through the third-quarter twist; and (c) superior landing performance than those receiving low scores.

scholarly journals The Concept of Accuracy Analysis of the Vertical Displacements Gained from the Hydrostatic Levelling Systems’ Measurements

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4842
Author(s):  
Waldemar Kamiński
Keyword(s):  
Accuracy Assessment ◽  
Theoretical Models ◽  
Vertical Displacement ◽  
Serial Connection ◽  
Vertical Displacements ◽  
Comprehensive Determination ◽  
The One ◽  
The Individual ◽  
Reference Sensor

Nowadays, hydrostatic levelling is a widely used method for the vertical displacements’ determinations of objects such as bridges, viaducts, wharfs, tunnels, high buildings, historical buildings, special engineering objects (e.g., synchrotron), sports and entertainment halls. The measurements’ sensors implemented in the hydrostatic levelling systems (HLSs) consist of the reference sensor (RS) and sensors located on the controlled points (CPs). The reference sensor is the one that is placed at the point that (in theoretical assumptions) is not a subject to vertical displacements and the displacements of controlled points are determined according to its height. The hydrostatic levelling rule comes from the Bernoulli’s law. While using the Bernoulli’s principle in hydrostatic levelling, the following components have to be taken into account: atmospheric pressure, force of gravity, density of liquid used in sensors places at CPs. The parameters mentioned above are determined with some mean errors that influence on the accuracy assessment of vertical displacements. In the subject’s literature, there are some works describing the individual accuracy analyses of the components mentioned above. In this paper, the author proposes the concept of comprehensive determination of mean error of vertical displacement (of each CPs), calculated from the mean errors’ values of components dedicated for specific HLS. The formulas of covariances’ matrix were derived and they enable to make the accuracy assessment of the calculations’ results. The author also presented the subject of modelling of vertical displacements’ gained values. The dependences, enabling to conduct the statistic tests of received model’s parameters, were implemented. The conducted tests make it possible to verify the correctness of used theoretical models of the examined object treated as the rigid body. The practical analyses were conducted for two simulated variants of sensors’ connections in HLS. Variant no. I is the sensors’ serial connection. Variant no. II relies on the connection of each CPs with the reference sensor. The calculations’ results show that more detailed value estimations of the vertical displacements can be obtained using variant no. II.

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