Results 91 to 100 of about 1,275 (248)

Motion Blurred Star Image Restoration Based on MEMS Gyroscope Aid and Blur Kernel Correction

Sensors, 2018
Under dynamic conditions, motion blur is introduced to star images obtained by a star sensor. Motion blur affects the accuracy of the star centroid extraction and the identification of stars, further reducing the performance of the star sensor.
Shiqiang Wang, Shijie Zhang, Mingfeng Ning, Botian Zhou   +3 more
doaj   +1 more source

On computingINV block preconditionings for the conjugate gradient method

BIT, 1986
The INV(k) and MINV(k) block preconditionings for the conjugate gradient method require generation of selected elements of the inverses of symmetric matrices of bandwidth \(2k+1\). Generalizing the previously described \(k=1\) (tridiagonal) case to \(k=2\), explicit expressions for the inverse elements of a symmetric pentadiagonal matrix in terms of ...
Concus, P., Meurant, G.
openaire   +2 more sources

4D Printable Formulations of Mixed Low and High Molecular Weight Liquid Crystalline Units: A Versatile Route to Functional Soft Actuators

Macromolecular Rapid Communications, EarlyView.
This work presents a practical approach for formulating 4D printable inks that incorporates substantial fractions of low molecular weight mesogens. By blending low molecular weight diacrylate or monoacrylate constituents with a high molecular weight main‐chain macromer, the resulting mixture proves suitable for direct ink writing, enabling mechanical ...
Lorena Ceamanos, María López‐Valdeolivas, Pengrong Lyu, Danqing Liu, Dirk J. Broer, Carlos Sánchez‐Somolinos   +5 more
wiley   +1 more source

Circadian Immunity and Vascular Inflammation in Cardiovascular Disease Chronotherapy Windows: Time for a Re‐Assessment

Med Research, EarlyView.
ABSTRACT Circadian rhythms orchestrate cardiovascular physiology by regulating immune and inflammatory pathways. Disruption of these rhythms profoundly alters vascular homeostasis, thereby promoting the onset and progression of cardiovascular diseases (CVD).
Tian Zhang, Ge Zhang, Tian‐Ding Liu, Tianshu Gu, Fengyi Yu, Pengyuan Xu, Wunan Mi, Xuanjiang Zhao, Qian Guo, Honglin Zheng, Taiqi Zhao, Qiang Li, Di Lu, Mingxuan Duan, Chaoyang Yu, Ruhao Wu, Shiqian Zhang, Haonan Zhang, Zeyu Wang, Youyang Zheng, Yan Xiao, Zenglei Zhang, Ge Zhang   +22 more
wiley   +1 more source

An improved preconditioned conjugate gradient method for unconstrained optimization problem with application in Robot arm control

Engineering Reports
This work suggests improved conjugate gradient methods for enhancing the efficiency and robustness of the classical conjugate gradient methods. The study modifies the diagonal of the inverse Hessian approximation of the Broyden–Fletcher–Goldfarb–Shanno ...
Lawal Muhammad, Mohammad Y. Waziri, Ibrahim Mohammed Sulaiman, Issam A.R. Moghrabi, Aceng Sambas   +4 more
doaj   +1 more source

A Fast Algorithm for Image Super-Resolution from Blurred Observations

EURASIP Journal on Advances in Signal Processing, 2006
We study the problem of reconstruction of a high-resolution image from several blurred low-resolution image frames. The image frames consist of blurred, decimated, and noisy versions of a high-resolution image.
Ng Michael K, Bose Nirmal K, Yau Andy C
doaj   +1 more source

Phase‐Pole‐Free Images and Smooth Coil Sensitivity Maps by Regularized Nonlinear Inversion

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Phase singularities are a common problem in image reconstruction with auto‐calibrated sensitivities due to an inherent ambiguity of the estimation problem. The purpose of this work is to develop a method for detecting and correcting phase poles in non‐linear inverse (NLINV) reconstruction of MR images and coil sensitivity maps ...
Moritz Blumenthal, Martin Uecker
wiley   +1 more source

Experiments and Recommendations for Partitioning Systems of Equations

Annals of the West University of Timisoara: Mathematics and Computer Science, 2014
Partitioning the systems of equations is a very important process when solving it on a parallel computer. This paper presents some criteria which leads to more efficient parallelization, that must be taken into consideration.
Mafteiu-Scai Liviu Octavian
doaj   +1 more source

Experimental Investigation of Moisture Movement During Freeze–Thaw Cycles and Its Effect on Physical Rock Weathering in Low‐Porosity Alpine Limestone

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The progressive weakening of alpine rockwalls through subcritical cracking, driven by repeated low‐magnitude stress processes, plays a key role in alpine rock weathering. Laboratory studies using acoustic emission (AE) monitoring have shown that thermal stresses from freeze–thaw cycling induce crack propagation, with recent work highlighting ...
Andrew Mitchell, Oliver Sass
wiley   +1 more source

A pilot variational coupled reanalysis based on the CESAM climate model

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Variational data assimilation of in‐situ and satellite ocean data and reanalysis atmospheric data into an intermediate complexity Earth system model is possible by adjusting the surface fluxes and internal model parameters. This pilot application requires nearly complete information on the atmospheric state for synchronization.
Armin Köhl, Iuliia Polkova, Guokun Lyu, Frank Lunkeit, Abhirup Banerjee, Silke Schubert, Detlef Stammer   +6 more
wiley   +1 more source