Results 51 to 60 of about 9,233 (214)

Microwave system performance summary [PDF]

, 1980
The design of the microwave system for the solar power satellite is described. Design modifications recommended include changes in phase control to the power module level, a reduction in allowable amplitude jitter, the use of metal matrix waveguides, and
Arndt, G. D., Nalos, E. J.
core   +1 more source

Understanding synthesis imaging dynamic range [PDF]

, 2012
We develop a general framework for quantifying the many different contributions to the noise budget of an image made with an array of dishes or aperture array stations.
Braun, Robert
core   +1 more source

Binary Sequences with Minimum Peak Sidelobe Level up to Length 68

, 2012
Results of an exhaustive search for minimum peak sidelobe level binary sequences are presented. Several techniques for efficiency implementation of search algorithm are described. A table of number of non-equivalent optimal binary sequences with minimum peak sidelobe (MPS) level up to length 68 is given.
Leukhin, Anatolii, Potehin, Egor
openaire   +2 more sources

Analogue optical pattern recognition for cross‐correlational CNN

Journal of Microscopy, EarlyView.
Abstract Pattern recognition in convolutional neural networks (CNNs) is computationally intensive due to its reliance on 2D convolutions, requiring significant processing power and time. This paper proposes an analogue optical hardware system to improve CNN efficiency, focusing on forward propagation tasks such as data preparation, correlation, and ...
Ahmed Farhat, Wim J. C. Melis
wiley   +1 more source

A Sibelobe Suppressing Beamformer for Coherent Plane Wave Compounding

Applied Sciences, 2016
Contrast degradation is a critical problem in ultrasound plane wave imaging (PWI) resulting from signals leakage from the sidelobes. An ideal sidelobe reduction method may enhance the contrast without remarkably increasing computational load. To this end,
Wei Guo, Yuanyuan Wang, Jinhua Yu
doaj   +1 more source

Next Generation 7 Tesla Arterial Spin Labeling With Rotated Spiral Acquisition Enables Mesoscale Resolution in 3D Brain Perfusion and Functional MRI

Magnetic Resonance in Medicine, Volume 95, Issue 5, Page 2702-2717, May 2026.
ABSTRACT Purpose To achieve high resolution (≤ 1 mm isotropic) whole‐brain perfusion imaging at 7 T with next generation ASL pulse sequence, reconstruction algorithm, and MRI hardware. Methods We capitalized on three major innovations: (1) FLASH‐based pseudo‐Continuous ASL (pCASL) sequence with rotated golden‐angle stack‐of‐spirals (rGA‐SoS) sampling; (
Chenyang Zhao, Fanhua Guo, Zidong Yang, Xingfeng Shao, Samantha J. Ma, Alexander J. S. Beckett, An T. Vu, David A. Feinberg, Danny J. J. Wang   +8 more
wiley   +1 more source

Measurement of Phase Velocity and Ellipticity of Multi‐Mode Surface Waves by Beamforming Multi‐Component Ambient Seismic Noise

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract Conventional beamforming of multi‐component ambient seismic noise typically utilizes only the vertical‐vertical (ZZ) component to extract Rayleigh wave dispersion curves or the transverse‐transverse (TT) component for Love waves. In this study, we extend weighted and modified beamforming to cross‐correlation functions between different ...
Tongwei Qin, Youyuan Zhang, Shanshan Jia, Laiyu Lu   +3 more
wiley   +1 more source

A 2D ultrasonic array design incorporating hexagonal-shaped elements for NDE applications [PDF]

, 2010
Contemporary 2D Ultrasonic arrays suffer from low SNR and limited steering capabilities. Yet, there is a great desire in the industry to increase the operational frequency, in order to enhance their volumetric imaging resolution.
Dziewierz, J., Gachagan, A., Hayward, G., O'Leary, R.L., Ramadas, S.N.   +4 more
core   +1 more source

Two-phase optimization of binary sequences with low peak sidelobe level value

Expert Systems with Applications
The search for binary sequences with low peak sidelobe level value represents a formidable computational problem. To locate better sequences for this problem, we designed a stochastic algorithm that uses two fitness functions. In these fitness functions, the value of the autocorrelation function has a different impact on the final fitness value.
Borko Bošković, Janez Brest
openaire   +2 more sources

Polymer‐Derived Nickel‐Iron Silicide‐Based Bimetallic Catalysts: Synthesis, Characterization, and Enhanced Catalytic Properties Toward the Oxygen Evolution Reaction

ChemElectroChem, Volume 13, Issue 6, 17 March 2026.
The growing demand for green energy highlights the need for efficient hydrogen production through water splitting. Designing bimetallic electrocatalysts is crucial for this goal. Transition metal silicides are promising due to their abundance and high electrical conductivity.
Yaohao Zhang, Zhaoju Yu, Wei Li, Chuanmu Tian, Marcus Einert, Jan P. Hofmann, Marcel Risch, Ralf Riedel   +7 more
wiley   +1 more source