Results 131 to 140 of about 40,293 (167)

Particle chaos and pitch angle scattering

Journal of Geophysical Research: Space Physics, 1995
One of the most important quantities that can be obtained through test particle calculations is the pitch angle scattering of particles by interaction with current sheet magnetic fields. Pitch angle scattering is a factor that helps determine the dawn‐to‐dusk current, controls particle energization, and it has also been used as a remote probe of the ...
G. R. Burkhart, P. B. Dusenbery, T. W. Speiser   +2 more
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Pitch angle diffusion by bounce resonance

Planetary and Space Science, 1978
Abstract The paper aims at removing the restriction x ⪡ 1 (where x is the cosine of the equatorial pitch angle) in the theory of pitch angle diffusion by bounce resonance. When the fourth order anharmonicity term is included in the expansion of the magnetic field around the equator, the parallel displacement of a particle becomes a superposition of ...
K.S. Viswanathan, G. Renuka
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High-speed pitch angle sorter

Review of Scientific Instruments, 1991
We have developed a high-speed method to compress the two-dimensional angular distribution of space particles gathered by space plasma instrumentation into the pitch angle distribution, where the pitch angle is polar angle with respect to the ambient magnetic field.
John W. Keller, R. B. Torbert, James Vandiver   +2 more
openaire   +1 more source

Curvature radiation for intermediate pitch angles

Astronomy Reports, 2013
The radiation by a charged particle in a non-uniform magnetic field is analyzed when the particle’s trajectory forms a curved spiral. The case when the pitch angle is less than the inverse of the Lorentz factor is considered. It is shown that the spectral angular distribution of the radiation consists of two parts that are substantially separated in ...
V. Ya. Epp, T. G. Mitrofanova, G. F. Kopytov, A. V. Pogorelov   +3 more
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Correction for angle of helix pitch in measurements of pitch diameter of an asymmetric thread

Measurement Techniques, 1971
1. The most accurate value of the correction for the helix angle of an asymmetrical thread is given, after Eq. (11), by Eq. (15), which can be applied to calculations of corrections in the case of almost all standard but-tress threads. 2. Calculations of the correction based on Eq. (11), using the method of successive approximations, can
�. P. Yanushkevich, E. G. Shevchenko
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Pitch angle diffusion as seen by CRRES

Advances in Space Research, 2000
Abstract Lifetimes and pitch angle distributions of radiation belt electrons injected into the slot region are determined from CRRES/MEA particle flux measurements. The dominant loss mechanism is presumed to be pitch angle scattering due to whistler waves, for which a theoretical formulation is available. The empirical lifetimes are compared to those
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A Review on Pitch Angle Control Strategy of Variable Pitch Wind Turbines

Advanced Materials Research, 2013
This paper summarizes the development process of wind turbines control technology, reviews the application of traditional control, sliding mode variable structure control, H robust control, adaptive control, fuzzy control, artificial neural network control and integrated control in the pitch angle control system of variable pitch wind turbines, points ...
Chao Tan, Hong Hua Wang
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Pitch angle diffusion in the Jovian magnetodisc

Journal of Geophysical Research: Space Physics, 1984
Currents in the Jovian middle magnetosphere draw out magnetic field lines radially into a configuration which has high equatorial curvature and weak field strength. Charged particles spiral along field lines into this equatorial region, where, depending on their energies, they may have gyroradii comparable to or larger than the scale length of the ...
openaire   +1 more source

PID Tuning for the Pitch Angle of a Two-Wheeled Vehicle

2015 12th Latin American Robotics Symposium and 2015 3rd Brazilian Symposium on Robotics (LARS-SBR), 2015
A two-wheeled vehicle is an unstable system and it can be approximated to inverted pendulum, so there is a need of a suitable controller so that it can be stabilized. This paper compares three PID design techniques without mathematical model of the system in order to remain it stand.
M. R. S. B. Souza, Rodrigo Hiroshi Murofushi, Jose J. P. Z. Tavares, J. F. Ribeiro   +3 more
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Pitch angle control for variable speed wind turbines

2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, 2008
Pitch angle control is the most common means for adjusting the aerodynamic torque of the wind turbine when wind speed is above rated speed and various controlling variables may be chosen, such as wind speed, generator speed and generator power. As conventional pitch control usually use PI controller, the mathematical model of the system should be known
Chen, Zhe; id_orcid 0000-0002-2919-4481, Zhang, Jianzhong, Cheng, M, Fu, Xiaofan   +3 more
openaire   +2 more sources