搜索结果: 1-15 共查到“理学 Roll”相关记录21条 . 查询时间(0.125 秒)
Signature of Large Aspect Ratio Roll Vortices in Synthetic Aperture Radar Images of Tropical Cyclones
Large Aspect Ratio Roll Vortices Synthetic Aperture Radar Images Tropical Cyclones
2015/7/16
Synthetic aperture radar images of tropical cyclones have been processed into high-resolution surface wind vector fields. Examination of the surface wind divergence and wind stress curl show that wind...
Gravitational Wave Production through Decay of the Inflaton into Intermediary Fields During Slow Roll Inflation
Gravitational Wave Intermediary Fields Slow Roll Inflation
2014/11/20
This dissertation looks for possible observable signals of tensor metric perturbations sourced during slow roll inflation from decay of the inflaton field into other intermediary fields. We focus on t...
Airfoil Roll Control by Bang-Bang Optimal Control Method with Plasma Actuators
Airfoil Roll Control Bang-Bang Optimal Control Method Plasma Actuators Plasma Physics
2012/4/20
The bang-bang optimal control method was proposed for glow discharge plasma actuators, taking account of practical issues, such as limited actuation states with instantaneously varied aerodynamic cont...
Periodically fighting shake, rattle and roll
Dynamical Systems Periodically rattle and roll
2011/8/31
Abstract: How easy is it to suppress shake, rattle and roll in a long bridge or a skyscraper? Most practical structures are designed so that long wave resonance vibrations can be avoided. However, the...
On the measure problem in slow roll inflation and loop quantum cosmology
slow roll inflation loop quantum cosmology
2010/12/27
We consider the measure problem in standard slow-roll inflationary models from the perspective of loop quantum cosmology (LQC). Following recent results by Ashtekar and Sloan, we study the probabilit...
Whitham's equations for modulated roll-waves in shallow flows
Whitham's equations modulated roll-waves
2010/11/15
This paper is concerned with the detailed behaviour of roll-waves undergoing a low-frequency perturbation. We rst derive the so-called Whitham's averaged modulation equations and relate the well-pose...
On the measure problem in slow roll inflation and loop quantum cosmology
measure problem slow roll inflation loop quantum cosmology
2010/12/20
We consider the measure problem in standard slow-roll in ationary models from the perspective
of loop quantum cosmology (LQC).
Stochastic Structural Stability Theory applied to roll/streak formation in boundary layer shear flow
Stochastic Structural Stability Theory boundary layer shear flow
2010/11/16
Stochastic Structural Stability Theory (SSST) provides an autonomous, deterministic, nonlinear dynamical system for evolving the statistical mean state of a turbulent system. In this work SSST is appl...
Chaotic Roll Motions of Ships in Regular Longitudinal Waves
parametric resonance Lyapunov characteristic exponents longitudinal waves.
2011/9/9
Parametric resonance can lead to dangerously large rolling motions, endangering the ship, cargo and crew. The QR-factorization method for calculating (LCEs) Lyapunov Characteristic Exponents was intro...
Slow-roll inflation with a Gauss-Bonnet correction
Slow-roll inflation Gauss-Bonnet correction
2010/3/19
We consider slow-roll inflation for a single scalar field with an arbitrary potential and an arbitrary non-minimal coupling to the Gauss-Bonnet term. By introducing a combined hierarchy of Hubble and ...
What makes a rolling landscape roll?New study explains evenly spaced ridges and valleys; could help identify signs of life on other planets（图）
rolling landscape ridges and valleys other planets
2009/7/28
The fundamental understanding of the processes that lead to these parallel grooves is not just useful theoretically, but could ultimately allow geologists to predict how eroding landscapes will respon...
Doppler Radar Observations of Horizontal Roll Vortices in Finland
Radar Observations Horizontal Roll Vortices Finland
2009/6/15
Doppler Radar Observations of Horizontal Roll Vortices in Finland.
The Statistical Evaluation of Directional Spectrum Estimates Derived from Pitch/Roll Buoy Data
Directional Spectrum Estimates Derived Pitch/Roll Buoy Data
2009/2/16
Estimates of the ocean wave directional spectrum may be extracted from observations of surface vertical acceleration and slope made with a pitch/roll buoy. The analysis requires the specification of a...
Multimodal Properties of the Surface-Wave Field Observed with Pitch-Roll Buoys During GATE
GARP Tropical Atlantic Experiment Surface-Wave Field Pitch-Roll Buoys
2009/2/5
A sophisticated analysis technique is applied to a subset of pitch-roll buoy data collected by the research vessels Gilliss and Quadra during the GARP Tropical Atlantic Experiment (GATE) in September ...
A Data-Adaptive Ocean Wave Directional-Spectrum Estimator for Pitch and Roll Type Measurements
Ocean Wave Directional-Spectrum Estimator Type Measurements
2009/1/21
A data-adaptive directional-spectrum estimator is developed for “point” measurement systems such as the pitch and roll buoy and slope array. This estimator, unlike the much employed unimodal cosine po...