Results 91 to 100 of about 3,086,556 (345)

Additive Manufacturing of Hot Work Tool Steel by Laser Powder Bed Fusion Utilizing Powder Mixtures Including Grinding Chips: Assessing Chemical Homogeneity and Achievable Hardness

Advanced Engineering Materials, EarlyView.
Grinding chips of high‐alloyed steel are prepared to be admixed to a starting powder mixture for laser powder bed fusion. A three‐stage preparation is performed, including washing in acetone, magnetic separation, and ball milling. The addition of 30% of grinding chips to the powder mixture allows the fabrication of dense samples.
Felix Großwendt, Chengsong Cui, Jonathan Lentz, Rainer Fechte‐Heinen, Sebastian Weber   +4 more
wiley   +1 more source

Compressive Imaging of Subwavelength Structures II. Periodic Rough Surfaces

, 2011
A compressed sensing scheme for near-field imaging of corrugations of relative sparse Fourier components is proposed. The scheme employs random sparse measurement of near field to recover the angular spectrum of the scattered field.
Albert Fannjiang, Arens, Arens, Ash, Beckmann, Candès, Candès, Chen, Derveaux, DeSanto, Deutsch, Donoho, Fannjiang, Garcia, Hecht, Hsiao-Chieh Tseng, Ivanyshyn, Keller, Khuri-Yakub, Lewis, Meier, Millar, Millar, Nieto-Vesperinas, Pohl, Rauhut, Riedera, Schatzberg, Sun, Uretsky, Wombell, Wombell, Yapar   +32 more
core   +1 more source

A Russian Dolls ordering of the Hadamard basis for compressive single-pixel imaging

Scientific Reports, 2017
Single-pixel imaging is an alternate imaging technique particularly well-suited to imaging modalities such as hyper-spectral imaging, depth mapping, 3D profiling.
Ming-Jie Sun, Ling-Tong Meng, Matthew P. Edgar, Miles J. Padgett, Neal Radwell   +4 more
doaj   +1 more source

A Positron Lifetime Study of Cooling and Natural Aging of Solutionized Aluminum Alloys

Advanced Engineering Materials, EarlyView.
The process during cooling of Al–Mg and Al–Mg–Si alloys from the solutionizing temperature down to 20 °C is interrupted. These states are analyzed with positron lifetime spectroscopy to trace the processes during cooling. In different temperature ranges, two stages of vacancy loss and solute clustering are identified.
Zi Yang, Mengjie Li, John Banhart
wiley   +1 more source

Microstructural Evolution and Mechanical Performance of Plasma‐Assisted Hybrid Friction Stir Welded Dissimilar Aluminum–Copper Joints

Advanced Engineering Materials, EarlyView.
Plasma‐assisted hybrid friction stir welding of dissimilar AlCu joints employs localized plasma preheating to balance heat input and enhance plastic flow. The optimized process reduces axial force by up to 35%, refines the microstructure, and achieves ≈96% joint efficiency.
Deepak Kumar Yaduwanshi, Pankaj Shrivastava, Ganesh Chouhan, Velaphi Msomi   +3 more
wiley   +1 more source

Information Theoretic Limits for Standard and One-Bit Compressed Sensing with Graph-Structured Sparsity

, 2018
In this paper, we analyze the information theoretic lower bound on the necessary number of samples needed for recovering a sparse signal under different compressed sensing settings.
Barik, Adarsh, Honorio, Jean
core  

One-bit compressed sensing with non-Gaussian measurements

, 2013
In one-bit compressed sensing, previous results state that sparse signals may be robustly recovered when the measurements are taken using Gaussian random vectors. In contrast to standard compressed sensing, these results are not extendable to natural non-
Ai, Albert, Lapanowski, Alex, Plan, Yaniv, Vershynin, Roman   +3 more
core   +2 more sources

Reconstruction of the Magnetic Particle Imaging System Matrix Using Symmetries and Compressed Sensing

Advances in Mathematical Physics, 2015
Magnetic particle imaging (MPI) is a tomographic imaging technique that allows the determination of the 3D spatial distribution of superparamagnetic iron oxide nanoparticles.
A. Weber, T. Knopp
doaj   +1 more source

Enhancing Fatigue Performance by Tuning of Residual Stresses in Welded Joints through Nanometallic Multilayer

Advanced Engineering Materials, EarlyView.
This study investigates the fundamental mechanisms of a novel postweld treatment that significantly enhances fatigue performance through engineered residual stress (RS) states. A multiscale approach correlates tensile RS in the nanometallic multilayer coating with corresponding compressive RS in the steel substrate, thereby reducing localized stress ...
Niclas Spalek, Guilherme Abreu Faria, Anton Davydok, Marcus Rutner   +3 more
wiley   +1 more source

Compressed sensing with combinatorial designs: theory and simulations [PDF]

, 2015
In 'An asymptotic result on compressed sensing matrices', a new construction for compressed sensing matrices using combinatorial design theory was introduced.
Bryant, Darryn, Catháin, Padraig Ó, Colbourn, Charles, Horsley, Daniel   +3 more
core