Results 71 to 80 of about 107,392 (290)

Soliton transverse instabilities in anisotropic nonlocal self-focusing media

, 2003
We study, both theoretically and experimentally, the transverse modulational instability of spatial stripe solitons in anisotropic nonlocal photorefractive media.
Anastassiou, Christodoulides, Friedemann Kaiser, Kivshar, Kos, Kristian Motzek, Mamaev, Ming-Feng Shih, Mitchell, Soljacic, Torres, Wen-Hen Chu, Yuri S. Kivshar, Zakharov, Zozulya   +14 more
core   +2 more sources

Time‐Dependent Oxidation and Scale Evolution of a Wrought Co/Ni‐Based Superalloy

Advanced Engineering Materials, EarlyView.
This study shows how a new wrought Co/Ni‐based superalloy resists oxidation at 800 ∘$^\circ$C. The oxide scale changes from rough, fast‐growing spinel to a dense, protective chromia–alumina layer. Atom probe analysis reveals tiny refractory‐rich bubbles at the interface that mark the transition to long‐term, diffusion‐controlled protection ...
Cameron Crabb, Zachary T. Kloenne, Samuel R. Rogers, Chi Hang Dominik Kwok, Mark C. Hardy, Michele S. Conroy, David Dye   +6 more
wiley   +1 more source

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, EarlyView.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source

Partially coherent isodiffracting pulsed beams

Physical Review A, 2018
We investigate a class of isodiffracting pulsed beams, which are superpositions of transverse modes supported by spherical-mirror laser resonators. By employing modal weights that, for stationary light, produce a Gaussian Schell-model beam, we extend this standard model to pulsed beams.
Koivurova, Matias, Ding, Chaoliang, Turunen, Jari, Liuzhan, Pan   +3 more
openaire   +3 more sources

Hollow Gaussian Schell-model beam and its propagation

, 2007
In this paper, we present a new model, hollow Gaussian-Schell model beams (HGSMBs), to describe the practical dark hollow beams. An analytical propagation formula for HGSMBs passing through a paraxial first-order optical system is derived based on the ...
Arlt, Arlt, Cai, Cai, Clifford, Collins, de Angelis, Erdelyi, Ganic, Gase, Grimm, Heckenberg, Kasevich, Kuga, Li-Gang Wang, Li-Qin Wang, Lin, Lin, Mamaev, Mandel, Song, Srivastava, Timp, Wang, Yin, Yin, Yin, Yin, Zhang, Zhang, Zhao, Zwillinger   +31 more
core   +1 more source

Numerical Exploration of Thermal Shock Resistance in MgO–C Refractories

Advanced Engineering Materials, EarlyView.
A mesostructure‐resolved numerical framework is developed to evaluate the thermal shock resistance of MgO–C refractories. By modeling interface debonding under rapid temperature changes and introducing a modified thermal shock parameter that accounts for mesocracks, the study shows how graphite content and aggregate size influence thermal shock ...
Jishnu Vinayak Gopi, Stephan Roth, Christos G. Aneziris, Bjoern Kiefer   +3 more
wiley   +1 more source

Correlation singularities in partially coherent electromagnetic beams [PDF]

Optics Letters, 2012
We demonstrate that coherence vortices, singularities of the correlation function, generally occur in partially coherent electromagnetic beams. In successive cross sections of Gaussian Schell-model beams, their locus is found to be a closed string. These coherence singularities have implications for both interference experiments and correlation of ...
Raghunathan, S.B. (author), Schouten, H.F. (author), Visser, T.D. (author)   +2 more
openaire   +5 more sources

Singularities of Partially Polarized Vortex Beams

Frontiers in Physics, 2020
Singularities in the polarization state of non-uniform electromagnetic beams have been a topic of both theoretical and practical interest for many years, as have singularities in the correlation functions of random scalar wavefields.
William Scott Raburn, Greg Gbur
doaj   +1 more source

Spatially-entangled Photon-pairs Generation Using Partial Spatially Coherent Pump Beam

, 2018
We demonstrate experimental generation of spatially-entangled photon-pairs by spontaneous parametric down conversion (SPDC) using a partial spatially coherent pump beam.
Defienne, Hugo, Gigan, Sylvain
core   +1 more source

Multimodal Data‐Driven Microstructure Characterization

Advanced Engineering Materials, EarlyView.
A self‐consistent autonomous workflow for EBSP‐based microstructure segmentation by integrating PCA, GMM clustering, and cNMF with information‐theoretic parameter selection, requiring no user input. An optimal ROI size related to characteristic grain size is identified.
Qi Zhang, Santiago Benito, Özge Özgün, Sebastian Weber, Markus Stricker   +4 more
wiley   +1 more source