Results 71 to 80 of about 378,095 (341)

Methods for evaluating the performance of volume phase holographic gratings for the VIRUS spectrograph array

, 2012
The Visible Integral Field Replicable Unit Spectrograph (VIRUS) is an array of at least 150 copies of a simple, fiber-fed integral field spectrograph that will be deployed on the Hobby-Eberly Telescope (HET) to carry out the HET Dark Energy Experiment ...
Chonis, Taylor S., Clemens, J. Christopher, Dunlap, Bart, Hill, Gary J., Lee, Hanshin   +4 more
core   +1 more source

Investigation on the Full-Aperture Diffraction Efficiency of AOTF Based on Tellurium Dioxide Crystals

Photonics
The influence of acoustic field distribution and temperature variations on the full-aperture diffraction efficiency of non-collinear acousto-optic tunable filters (AOTFs) was investigated based on tellurium dioxide crystals.
Zhiyuan Mi, Huijie Zhao, Qi Guo, Zhoujun Zhong, Chengsheng Zhou   +4 more
doaj   +1 more source

Mitigation of Cracks in High‐Performance Nickel‐Based Superalloys in Powder Bed Fusion Laser Beam of Metals Using a Metal Matrix Composite Approach

Advanced Engineering Materials, EarlyView.
High‐performance nickel‐based superalloys are often not processible in additive manufacturing (AM) due to hot cracking. The findings in this manuscript propose an efficient method to mitigate cracking and enhance mechanical properties of these alloys by producing a metal matrix composite, contributing to the material and process perspective of the AM ...
Klaus Büßenschütt, Maël Pontoreau, Christian Haase, Johannes‐Henrich Schleifenbaum   +3 more
wiley   +1 more source

The increase in diffraction efficiency of an azobenzene side-chain polymer using imidazolium and ammonium ionic liquids

Journal of Saudi Chemical Society, 2022
The advancement of the information age has intensified the focus on photosensitive materials for information storage devices. To develop new photosensitive two azobenzene side-chain polymers i.e., poly(E)-3-(4-((4-nitrophenyl)diazenyl)phenoxy)propyl ...
Sung Ho Kim, Soyeon Kim, Namwook Kim, Pankaj Attri, In Tae Kim   +4 more
doaj   +1 more source

Influence of Heat Treatment on Microstructure and Mechanical Properties at Elevated Temperatures of Nonweldable Ni‐Based Alloy Printed by Fused Filament Fabrication

Advanced Engineering Materials, EarlyView.
The fused filament‐fabricated MAR‐M247 alloy without hot isostatic pressing shows the lowest porosity of 4%. Heat treatment at 1220 °C produces coarse precipitates and carbides. Specimens heat‐treated at 1220 °C exhibit higher tensile strength (683 MPa) and elongation (10%) at room temperature.
Haneen Daoud, Ying Zheng, Agata Kulig, Natalja Agarkov, Esma Mese, Wolfgang Hofmann, Peter Würtele, Uwe Glatzel   +7 more
wiley   +1 more source

Periodically refreshed multiply exposed photorefractive holograms [PDF]

, 1990
We describe a method for increasing the diffraction efficiency of multiply exposed photorefractive holograms by periodic copying.
Brady, David, Hsu, Ken, Psaltis, Demetri
core  

Volume diffraction gratings for optical telecommunications applications: design study for a spectral equalizer [PDF]

, 2004
The main characteristics required for a diffraction grating used for demultiplexing functions in spectral equalizing systems are investigated, both theoretically and experimentally.
Chevallier, Raymond, Heggarty, Kevin, Loukina, Tatiana, Massenot, Sébastien, Shigapova, N.M., Skochilov, A.F   +5 more
core   +1 more source

Direct Electron Detection Electron Energy‐Loss Spectroscopy: Speeding Up 2D Analytical In Situ Transmission Electron Microscopy for Aluminum Alloys

Advanced Engineering Materials, EarlyView.
Scanning transmission electron microscopy imaging techniques are an essential tool to document dynamic developments, such as precipitation in aluminum alloys, during in situ heating experiments using transmission electron microscopy. However, in many cases, chemical information is required to interpret complex nanoscale processes.
Evelin Fisslthaler, Martina Dienstleder, Judith Lammer, Moritz Theissing, Daniel Knez   +4 more
wiley   +1 more source

Study of Optical, Electrophotographic and Holographic Parameters of As-Se Condensates from the Prehistory of the Original Bulk Materials

East European Journal of Physics
The results of a study of the optical, electrophotographic and holographic parameters of As-Se condensates from the prehistory of the original bulk materials are presented.
Sharifa B. Utamuradova, Zakirjan T. Azamatov, A.I. Popov, Mira R. Bekchanova, Murodjon A. Yuldoshev, Abror B. Bakhromov   +5 more
doaj   +1 more source

Study of diffraction efficiency of diffraction gratings by the modified method of variables separation

Известия высших учебных заведений. Поволжский регион: Физико-математические науки, 2022
Background. The purpose of this work is to study the electromagnetic wave diffraction by cylindrical diffraction gratings. Material and methods. The problem is solved using the modified method of separation of variables. Results. The modified method of
Yu.G. Smirnov, V.Yu. Martynova, M.A. Moskaleva, A.A. Tsupak   +3 more
doaj   +1 more source