Results 31 to 40 of about 149,288 (320)

Measurement of Birefringence of Low-Loss, High-Reflectance Coating of M-Axis Sapphire [PDF]

open access: yes, 2001
The birefringence of a low-loss, high-reflectance coating applied to an 8-cm-diameter sapphire crystal grown in the m-axis direction has been mapped. By monitoring the transmission of a high-finesse Fabry-Perot cavity as a function of the polarization of
Camp, Jordan B.   +3 more
core   +1 more source

Heteroepitaxial Growth of High-Quality and Crack-Free AlN Film on Sapphire Substrate with Nanometer-Scale-Thick AlN Nucleation Layer for AlGaN-Based Deep Ultraviolet Light-Emitting Diodes

open access: yesNanomaterials, 2019
High-quality and crack-free aluminum nitride (AlN) film on sapphire substrate is the foundation for high-efficiency aluminum gallium nitride (AlGaN)-based deep ultraviolet light-emitting diodes (DUV LEDs). We reported the growth of high-quality and crack-
Jie Zhao   +5 more
doaj   +1 more source

Enhanced crystalline quality of non-polar a-plane AlGaN epitaxial film grown with Al-composition-graded AlGaN intermediate layer

open access: yesMaterials Research Express, 2021
The non-polar a -AlGaN epitaxial film was successfully grown on the semi-polar r- sapphire substrate by metal-organic chemical vapor deposition technique.
Abbas Nasir   +5 more
doaj   +1 more source

Influence of crystal anisotropy and process parameters on surface shape deviation of sapphire slicing

open access: yesJin'gangshi yu moliao moju gongcheng, 2023
Due to the anisotropy of sapphire crystal material, the mechanical properties vary in multi-wire saw slicing based on different cutting positions. This variation leads to the deviation of the diamond wire in the vertical feed direction, resulting in the ...
Chao WANG   +3 more
doaj   +1 more source

Testing Lorentz Invariance by Comparing Light Propagation in Vacuum and Matter

open access: yes, 2010
We present a Michelson-Morley type experiment for testing the isotropy of the speed of light in vacuum and matter. The experiment compares the resonance frequency of a monolithic optical sapphire resonator with the resonance frequency of an orthogonal ...
Döringshoff, K.   +6 more
core   +1 more source

Change in equilibrium position of misfit dislocations at the GaN/sapphire interface by Si-ion implantation into sapphire—I. Microstructural characterization

open access: yesAIP Advances, 2015
Much research has been done to reduce dislocation densities for the growth of GaN on sapphire, but has paid little attention to the elastic behavior at the GaN/sapphire interface.
Sung Bo Lee   +6 more
doaj   +1 more source

High-Purity Corundum as Support for Affinity Extractions from Complex Samples

open access: yesSeparations, 2022
Nonporous corundum powder, known as an abrasive material in the industry, was functionalized covalently with protein binders to isolate and enrich specific proteins from complex matrices.
Jule L. Völzke   +6 more
doaj   +1 more source

GERMS JOURNEY: co-creation of resources for addressing UN Sustainable Development Goals in education & health in developing countries [PDF]

open access: yes, 2019
Following a Participatory Action Research (PAR) model, this study evaluates whether specifically developed resources (‘A Germ’s Journey’) aid children in India’s understanding of hand-hygiene principles.
Crosby, Sapphire   +2 more
core  

Graphene microwave transistors on sapphire substrates

open access: yes, 2011
We have developed metal-oxide graphene field-effect transistors (MOGFETs) on sapphire substrates working at microwave frequencies. For monolayers, we obtain a transit frequency up to ~ 80 GHz for a gate length of 200 nm, and a power gain maximum ...
A. C. Betz   +10 more
core   +1 more source

The CRESST Experiment: Recent Results and Prospects [PDF]

open access: yes, 2000
The CRESST experiment seeks hypothetical WIMP particles that could account for the bulk of dark matter in the Universe. The detectors are cryogenic calorimeters in which WIMPs would scatter elastically on nuclei, releasing phonons. The first phase of the
Ari D   +23 more
core   +3 more sources

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