Results 71 to 80 of about 390,346 (343)

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

Recent Advancements in Bulk Processing of Rare‐Earth‐Free Hard Magnetic Materials and Related Multiscale Simulations

Advanced Engineering Materials, EarlyView.
This article provides an overview of recent advancements in bulk processing of rare‐earth‐free hard magnetic materials. It also addresses related simulation approaches at different scales. The research on rare‐earth‐free magnetic materials has increased significantly in recent years, driven by supply chain issues, environmental and social concerns, and
Daniel Scheiber, Andrea Bachmaier
wiley   +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

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  

High efficiency and low absorption Fresnel compound zone plates for hard X-ray focusing

, 2005
Circular and linear zone plates have been fabricated on the surface of silicon crystals for the energy of 8 keV by electron beam lithography and deep ion plasma etching methods.
Aristov, V., Ishikawa, T., Isoyan, A., Kondratenkov, M., Kuyumchyan, A., Shulakov, E., Snigirev, A., Snigireva, I., Souvorov, A., Tamasaku, K., Trouni, K., Yabashi, M.   +11 more
core   +1 more source

A Workflow to Accelerate Microstructure‐Sensitive Fatigue Life Predictions

Advanced Engineering Materials, EarlyView.
This study introduces a workflow to accelerate predictions of microstructure‐sensitive fatigue life. Results from frameworks with varying levels of simplification are benchmarked against published reference results. The analysis reveals a trade‐off between accuracy and model complexity, offering researchers a practical guide for selecting the optimal ...
Luca Loiodice, Krzysztof S. Stopka, Michael D. Sangid   +2 more
wiley   +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

Multipass holographic interferometer improves image resolution [PDF]

, 1970
Multipass holographic interferometer forms a hologram of high diffraction efficiency, and hence provides a bright and high contrast interferogram. It is used to study any effect which changes the index of refraction and to study surface deformations of a
Brooks, R. E., Heflinger, L. O.
core   +1 more source

Enhanced Oxidation and Thermal Shock Resistance of N‐type Mg2Si0.89(Sn0.1,Sb0.01) Thermoelectric Material via Cr0.9Si0.1 Coating

Advanced Engineering Materials, EarlyView.
Cr0.9Si0.1 protective coatings are developed to enhance the thermal‐shock and oxidation resistance of Mg2Si0.89(Sn0.1,Sb0.01) thermoelectric (TE) materials. The coating forms a dense and adherent barrier that suppresses oxygen diffusion and mitigates mechanical degradation during cyclic oxidation, demonstrating its potential to improve the long‐term ...
Mikdat Gurtaran, Zhenxue Zhang, Xiaoying Li, Hanshan Dong   +3 more
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