Results 111 to 120 of about 239,845 (311)

Quantifying fundamental mode purity with M2-measurements

JPhys Photonics
Beam quality is a fundamental aspect for evaluating the performance of laser sources. M ^2 -measurements serve as the gold standard for beam quality assessment since the 1990s.
Filipp Lausch, Vito F Pecile, Oliver H Heckl   +2 more
doaj   +1 more source

Double-Clad Anti-Resonant Hollow-Core Fiber With Inner Cladding Tube Offset for Mode Tailoring

IEEE Photonics Journal
We demonstrate a double-clad anti-resonant hollow-core fiber (DC-ARF) with an offset inner cladding structure for effective mode tailoring. The DC-ARF consists of six thin-walled, azimuthally offset inner tubes enclosed within a thicker outer cladding ...
Yang Wang, Wei Chen, Xiaobei Zhang, Qi Zhang, Tingyun Wang   +4 more
doaj   +1 more source

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

Diagnóstico de reabsorção radicular por meio de tomografia computadorizada de feixe cônico: uma revisão da literatura [PDF]

, 2013
TCC (graduação) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Curso de OdontologiaA perda da integridade do pré-cemento ou da pré-dentina torna o tecido mineralizado susceptível à ação das células clásticas, o que pode acarretar ...
Costa, Danielle Flor da
core  

Karl Popper and the Mechanisms of Hydrogen Embrittlement

Advanced Engineering Materials, EarlyView.
Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley   +1 more source

Kinematically complete experiments for positron-impact ionization of helium atoms at the NEPOMUC facility [PDF]

, 2011
12th International Workshop on Slow Positron Beam Techniques (SLOPOS12), 1–6 August 2010, Magnetic Island, North Queensland, AustraliaPositron impact ionization of helium is studied with fully resolved momentum vectors of all continuum particles.
Senftleben, A., J C Lower, Buckman, S., Senftleben, A, J Ullrich, Holzwarth, M, Hargreaves, Leigh Randall, Hargreaves, L.R., M Holzwarth, Ullrich, Joachim, Lower, J., X Ren, S J Buckman, Lohmann, Birgit, J P Sullivan, Slaughter, D., B Lohmann, T Pflüger, Slaughter, Daniel, Dorn, A., Ren, X, Lohmann, B., A Dorn, Sullivan, J., Sullivan, James, Dorn, Alexander R, Buckman, Stephen J., Pflüger, T, Sullivan, J. P., D S Slaughter, Ullrich, J., A Senftleben, Hargreaves, L., Holzwarth, M., Ren, X. N., Lower, Julian, Pfluger, T., Buckman, Stephen, Slaughter, D. S., Ren, X., L R Hargreaves   +40 more
core   +1 more source

Lamellae preparation for atomic-resolution STEM imaging from ion-beam-sensitive topological insulator crystals

, 2022
Good specimen quality is a key factor in achieving successful scanning transmission electron microscope analysis. Thin and damage-free specimens are prerequisites for obtaining atomic-resolution imaging.
Weiyao Zhao (6378041), Xiaolin Wang (303612), David Cortie (6943478), Mitchell Nancarrow (14321552), David Mitchell (407572), Abdulhakim Bake (20089401)   +5 more
core   +1 more source

Comparative investigation of beam quality index Q on flattening filter and flattening filter free 6 and 15 MV photon beams of an medical linear accelerator

Current Directions in Biomedical Engineering, 2017
An Elekta Synergy LINAC was used to investigate the beam quality index Q and the beam quality correction factor kQ, which is used for absolute dosimetry, in off-axis photon fields.
Schaks Michael, Zähle Johannes, Janich Martin, Hübsch Patrick, Homonnay Nico, Gerlach Reinhard   +5 more
doaj   +1 more source

Characterization of Laser Beam Shaping Optics Based on Their Ablation Geometry of Thin Films

Micromachines, 2014
Thin film ablation with pulsed nanosecond lasers can benefit from the use of beam shaping optics to transform the Gaussian beam profile with a circular footprint into a Top-Hat beam profile with a rectangular footprint.
Stefan Rung, Johannes Barth, Ralf Hellmann   +2 more
doaj   +1 more source

Affecting the Properties of Copper–Graphene Electroconductive Composite by Severe Plastic Deformation

Advanced Engineering Materials, EarlyView.
Copper‐based composites enhanced with carbon feature convenient mechanical properties and favorable electric conductivity. Processing via deformation and thermomechanical treatments can introduce advantageous microstructures further enhancing their performance. Herein, copper–graphene powder‐based composites are directly consolidated via rotary swaging
Radim Kocich, Lenka Kunčická, Pavel Czernek, Zifan Wang   +3 more
wiley   +1 more source