Localized rotational perturbation between 5pπD″(v=2) and 7pπ(v=1) states of H2

1994 ◽  
Vol 82 (2) ◽  
pp. 351-357
Author(s):  
Sanzo Takezawa
Keyword(s):  
Rotational Perturbation

scholarly journals Perturbation of the Non-Radial Oscillations of a Gaseous Star by an Axial Rotation, a Tidal Action or a Magnetic Field

1974 ◽  
Vol 59 ◽  
pp. 197-198
Author(s):  
P. Smeyers
Keyword(s):  
Magnetic Field ◽  
Homogeneous Model ◽  
Axial Rotation ◽  
Second Order ◽  
Third Order ◽  
Polytropic Model ◽  
Rotational Perturbation ◽  
Tidal Perturbation ◽  
Approximate Expressions ◽  
Gaseous Star

The study of the linear and adiabatic oscillations of a gaseous star gives rise to an eigenvalue problem for the pulsation σ, if perturbations proportional to eiσt are considered. In the presence of a rotation, a tidal action or a magnetic field, the equations are not separable in spherical coordinates. To get approximate expressions for the influence of these factors on the non-radial oscillations of a star, the author and his collaborators J. Denis and M. Goossens have used a perturbation method (Smeyers and Denis, 1971; Denis, 1972; Goossens, 1972; Denis, 1973). Their procedure corresponds to a generalization of the method proposed by Simon (1969) to study the second order rotational perturbation of the radial oscillations of a star.Two types of perturbations are taken into account: volume perturbations due to the local variations of the equilibrium quantities and to the presence of a supplementary force in the equation of motion (Coriolis force, Lorentz force); surface perturbations related to the distortion of the equilibrium configuration and to the change of the condition at the surface in the presence of a magnetic field. The resulting expressions are accurate up to the second order in the angular velocity in the case of a rotational perturbation, to the third order in the ratio of the mean radius of the primary to the distance of the secondary in the case of a tidal perturbation, and to the second order in the magnetic field in the case of a perturbing magnetic field. These expressions can in principle be applied to any mode.Numerical results have been obtained for a homogeneous model and for a polytropic model n = 3. In particular, the splitting of the frequencies of the fundamental radial mode and of the f-mode belonging to l = 2 and m = 0 has been studied for the critical value of y, in the case of a component of a synchronously rotating binary system.

ADJUSTMENTS OF UPRIGHT STANDING POSTURE TO ROTATIONAL PERTURBATION OF THE TRUNK

2007 ◽  
Vol 40 ◽  
pp. S701
Author(s):  
Y. Yamazaki ◽  
T. Wang ◽  
M. Suzuki ◽  
T. Ohkuwa ◽  
H. Itoh
Keyword(s):  
Standing Posture ◽  
Rotational Perturbation ◽  
Upright Standing

scholarly journals The Rayleigh-Taylor Instability Overturn of Supernova Cores during Bouncing and Resulting Neutrino Energy Release

1980 ◽  
Vol 5 ◽  
pp. 517-519
Author(s):  
S. A. Colgate ◽  
A. G. Petschek
Keyword(s):  
Kinetic Energy ◽  
Energy Release ◽  
Neutrino Energy ◽  
Gravitational Energy ◽  
Taylor Instability ◽  
Rotational Perturbation ◽  
Reversal Time ◽  
Sudden Release ◽  
Rayleigh Taylor Instability

We show that Rayleigh-Taylor convective overturn of the dynamically formed lepton-trapped core of a supernova is a likely outcome of three sequential events: (1) The bounce or weak reversal shock; (2) the diffusive and convective lepton release from the neutrino-sphere during a fraction of the reversal time (≌ 100 ms); and (3) the rapid (≤ 10 ms) Rayleigh-Taylor growth of the l = 2 mode of an initial rotational perturbation. The overturn releases gravitational energy corresponding to a differential trapped lepton pressure energy of 30 to 50 MeV/nucleon by P dV work in beta equilibrium in a fraction of a millisecond. The resulting kinetic energy of ≌ 7 × 1052 ergs is more than adequate to cause the observed supernova emission. Also, the sudden release of ≌ 7 × 1051 ergs of ˜ 10 MeV neutrinos from the neutrinosphere will cause adequate mass and energy ejection.

scholarly journals Posture Stabilization of Wheeled Mobile Robot Based on Passivity-Based Robust Switching Control with Model Uncertainty Compensation

2019 ◽  
Vol 9 (23) ◽  
pp. 5233 ◽  
Author(s):  
Jung ◽  
Bang
Keyword(s):  
Robust Control ◽  
Global Convergence ◽  
Model Uncertainty ◽  
Switching Control ◽  
Initial Position ◽  
Wheeled Mobile Robots ◽  
Control Laws ◽  
Rotational Perturbation ◽  
Posture Stabilization ◽  
Uncertainty Compensation

Thisstudy presents apassivity-based robust switching control for the posture stabilization of wheeled mobile robots (WMRs) with model uncertainty. Essentially, this proposed strategy is switching between (1) passivity-based robust control to lead the robot to the neighborhood of local minima with a finite time and (2) another robust control to perturb the w-rotational motion of the WMR before the v-kinetic energy of the WMR become meaningless, thereby, eventually converging to the desired posture. Thus, combining two switching control laws ensures the global convergence of (x,y)-navigation of WMRs from any initial position to desired set. Especially, the inter-switching time is intentionallyselected before the WMR completely loses its mobility, which ensures a strict decrease in (x,y)-navigation potential energy and a better global convergence rate. In addition, this control architecture also includes model uncertainty compensation, often neglected in practice, and analytical study of rotational perturbation was also conducted. The Lyapunov technique and energetic passivity wereutilized to derive this control law. Simulation results are presented to illustrate the effectiveness of the proposed technique. It wasfound from the results that the WMR wasquickly converged to the desired posture even under the presence of model uncertainty.

High-resolution vibration–rotational spectra and rotational perturbation of the OO-stretching (ν6) band of CH2OO between 879.5 and 932.0 cm−1

2018 ◽  
Vol 20 (40) ◽  
pp. 25806-25811 ◽  
Author(s):  
Pei-Ling Luo ◽  
Yasuki Endo ◽  
Yuan-Pern Lee
Keyword(s):  
High Resolution ◽  
Optical Resolution ◽  
Rotational Spectra ◽  
Rotational Perturbation

We report the observation of a rotationally resolved ν6 band associated with the OO-stretching mode of the simplest Criegee intermediate, CH2OO, in the range of 879.5–932.0 cm−1 (11.37–10.73 μm) at an optical resolution of 0.0015 cm−1.

scholarly journals Rotational Perturbation of A Radial Oscillation in A Gaseous Star

1970 ◽  
Vol 4 ◽  
pp. 37-38
Author(s):  
R. Simon
Keyword(s):  
Perturbation Method ◽  
Radial Oscillation ◽  
Rotational Perturbation ◽  
General Law ◽  
Gaseous Star

The perturbation method has been applied to the problem of the oscillations of a gaseous star rotating around a fixed z-axis according to a general law of the type

Reward feedback accelerates motor learning

2015 ◽  
Vol 113 (2) ◽  
pp. 633-646 ◽  
Author(s):  
Ali A. Nikooyan ◽  
Alaa A. Ahmed
Keyword(s):  
Motor Learning ◽  
Visual Feedback ◽  
Learning Process ◽  
Sensory Feedback ◽  
Visuomotor Learning ◽  
Visuomotor Rotation ◽  
Rotational Perturbation ◽  
Drive Motor ◽  
Underlying Mechanisms ◽  
Broad Generalization

Recent findings have demonstrated that reward feedback alone can drive motor learning. However, it is not yet clear whether reward feedback alone can lead to learning when a perturbation is introduced abruptly, or how a reward gradient can modulate learning. In this study, we provide reward feedback that decays continuously with increasing error. We asked whether it is possible to learn an abrupt visuomotor rotation by reward alone, and if the learning process could be modulated by combining reward and sensory feedback and/or by using different reward landscapes. We designed a novel visuomotor learning protocol during which subjects experienced an abruptly introduced rotational perturbation. Subjects received either visual feedback or reward feedback, or a combination of the two. Two different reward landscapes, where the reward decayed either linearly or cubically with distance from the target, were tested. Results demonstrate that it is possible to learn from reward feedback alone and that the combination of reward and sensory feedback accelerates learning. An analysis of the underlying mechanisms reveals that although reward feedback alone does not allow for sensorimotor remapping, it can nonetheless lead to broad generalization, highlighting a dissociation between remapping and generalization. Also, the combination of reward and sensory feedback accelerates learning without compromising sensorimotor remapping. These findings suggest that the use of reward feedback is a promising approach to either supplement or substitute sensory feedback in the development of improved neurorehabilitation techniques. More generally, they point to an important role played by reward in the motor learning process.

The infrared spectrum of aminodifluoroborane, NH2BF2: Partial assignment of the fundamentals and analysis of the band near 1608 cm−1

1988 ◽  
Vol 66 (8) ◽  
pp. 2088-2099 ◽  
Author(s):  
H. M. Jemson ◽  
W. Lewis-Bevan ◽  
M. C. L. Gerry
Keyword(s):  
Infrared Spectrum ◽  
Gas Phase ◽  
Spectroscopic Constants ◽  
Centrifugal Distortion ◽  
Coriolis Interaction ◽  
Partial Assignment ◽  
Rotational Perturbation ◽  
Band Origin ◽  
Centrifugal Distortion Constants ◽  
First Time

The infrared spectrum of gas phase aminodifluoroborane, NH2BF2, has been observed for the first time. A partial assignment to the fundamental vibrations has been made. The [Formula: see text] band has been recorded at high resolution, and the rotational and centrifugal distortion constants of NH211F2 have been obtained in both the ground and 21 levels. A small rotational perturbation in the 21 level has been attributed to a perpendicular Coriolis interaction. Using a newly written least-squares fitting program, spectroscopic constants of the unseen level have been evaluated, including its band origin and the Coriolis coupling coefficient. Possible identities of the unseen level are suggested.

scholarly journals DATA PROCESSING THROUGH AN ADDITIVE ROTATIONAL PERTURBATION TECHNIQUE IN A SECURED ENVIRONMENT OF PPRIVACY

2021 ◽  
Vol 9 (2) ◽  
pp. 131-135
Author(s):  
G. Srinivas Reddy, Et. al.
Keyword(s):  
Data Mining ◽  
Privacy Preservation ◽  
Web Applications ◽  
Perturbation Technique ◽  
Privacy Preserving ◽  
Security And Privacy ◽  
Experimental Result ◽  
Perturbation Approach ◽  
Privacy Preserving Data Mining ◽  
Rotational Perturbation

As the usage of internet and web applications emerges faster, security and privacy of the data is the most challenging issue which we are facing, leading to the possibility of being easily damaged. Various conventional techniques are used for privacy preservation like condensation, randomization and tree structure etc., the limitations of the existing approaches are, they are not able to maintain proper balance between the data utility and privacy and it may have the problem with privacy violations. This paper presents an Additive Rotation Perturbation approach for Privacy Preserving Data Mining (PPDM). In this proposed work, various dataset from UCI Machine Learning Repository was collected and it is protected with a New Additive Rotational Perturbation Technique under Privacy Preserving Data Mining. Experimental result shows that the proposed algorithm’s strength is high for all the datasets and it is estimated using the DoV (Difference of Variance) method.

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