Results 91 to 100 of about 326,006 (283)

Pseudospectral Model Predictive Control under Partially Learned Dynamics

, 2017
Trajectory optimization of a controlled dynamical system is an essential part of autonomy, however many trajectory optimization techniques are limited by the fidelity of the underlying parametric model. In the field of robotics, a lack of model knowledge
Alvarez M. A., Gandhi M., Lázaro-Gredilla M., Pan Y., Rahimi A., Rudin W., Wang J.   +6 more
core   +1 more source

A novel unified variational finite difference (VFD) solution method for optimal control problems

Measurement + Control
This article is aimed to propose a simple yet efficient unified numerical strategy for solving both linear and non-linear optimal control problems. To do so, the general form of quadratic performance index function and nonlinear state equations are ...
Amir Norouzzadeh, Nader Nariman-zadeh, Reza Ansari   +2 more
doaj   +1 more source

Topological Photonic Devices and Circuits at Terahertz Frequencies

Laser &Photonics Reviews, EarlyView.
This review examines how 3D topological insulators and emerging topological photonic phases enable robust, low‐loss and defect‐immune terahertz devices. Fundamental properties, device implementations and topological transport mechanisms are surveyed, revealing new opportunities for reconfigurable, high‐performance THz components and scalable ...
Samane Kalhor, Srabani Kar, Ranjan Singh, Kaveh Delfanazari   +3 more
wiley   +1 more source

The Structure of Weighting Coefficient Matrices of Harmonic Differential Quadrature and Its Applications

, 1999
The structure of weighting coefficient matrices of Harmonic Differential Quadrature (HDQ) is found to be either centrosymmetric or skew centrosymmetric depending on the order of the corresponding derivatives.
Chen, W., Wang, W., Zhong, T.
core  

Statistics of non-linear stochastic dynamical systems under L\'evy noises by a convolution quadrature approach

, 2011
This paper describes a novel numerical approach to find the statistics of the non-stationary response of scalar non-linear systems excited by L\'evy white noises.
Cottone G Di Paola M Marino F, Dybiec B, Gikhman I I, Giulio Cottone, Grigoriu M, Lin Y K, Masud A, Metzler R, Protter Philip E, Risken H, Roberts J B, Samko S G, Sobczyk K, Wedig W V, Young D M   +14 more
core   +1 more source

Finite Biorthogonal Polynomials Suggested by the Finite Orthogonal Polynomials Mnp,qx$$ {M}_n^{\left(p,q\right)}(x) $$

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT Constructing a biorthogonal structure from scratch, that is, defining a biorthogonal pair is quite tough. Because here the orthogonality must be established between two different sets. There are four known univariate biorthogonal polynomial sets, suggested by Laguerre, Jacobi, Hermite and Szegő‐Hermite polynomials, in the literature.
Esra Güldoğan Lekesiz
wiley   +1 more source

Linear transmitter design for MSAT terminals [PDF]

, 1990
One of the factors that will undoubtedly influence the choice of modulation format for mobile satellites, is the availability of cheap, power-efficient, linear amplifiers for mobile terminal equipment operating in the 1.5-1.7 GHz band.
Bateman, Andrew, Beach, Mark, Macleod, John, Wilkinson, Ross   +3 more
core   +1 more source

High-order commutator-free exponential time-propagation of driven quantum systems

, 2011
We discuss the numerical solution of the Schr\"odinger equation with a time-dependent Hamilton operator using commutator-free time-propagators. These propagators are constructed as products of exponentials of simple weighted sums of the Hamilton operator.
Alvermann, A., Fehske, H.
core   +1 more source

Double Asymmetric Spin Echo EPI (dASE‐EPI) Enables fMRI of the Entire Rat Brain at 9.4 T

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Development and evaluation of a double asymmetric spin echo planar imaging (dASE‐EPI) sequence to balance sensitivity to blood oxygenation level‐dependent (BOLD) contrast with mitigation of susceptibility‐induced intravoxel spin dephasing in ultra high‐field rodent brain imaging.
Kyle A. Johnson, Hanbing Lu, Jason W. Sidabras   +2 more
wiley   +1 more source

Fractional Partial Differential Equation Modeling for Solar Cell Charge Dynamics

Fractal and Fractional
This paper presents a groundbreaking numerical approach, the fractional differential quadrature method (FDQM), to simulate the complex dynamics of organic polymer solar cells.
Waleed Mohammed Abdelfattah, Ola Ragb, Mohamed Salah, Mohamed S. Matbuly, Mokhtar Mohamed   +4 more
doaj   +1 more source