Results 71 to 80 of about 41,858 (234)

Hydrogen response to high‐density dislocations in bulk perovskite oxide SrTiO3

Journal of the American Ceramic Society, Volume 109, Issue 1, January 2026.
High‐density dislocations are engineered into single‐crystal strontium titanate using cyclic Brinell indentation scratch tests at room temperature. These dislocations are found effective in uptaking hydrogen. Abstract Hydrogen plays an increasingly important role in green energy technologies. For instance, proton‐conducting oxides with high performance
Xufei Fang, Lars Dörrer, Svetlana Korneychuk, Maria Vrellou, Alexander Welle, Stefan Wagner, Astrid Pundt, Harald Schmidt, Christoph Kirchlechner   +8 more
wiley   +1 more source

A study of some properties for substituted Li-ferrite using positron annihilation lifetime technique

Results in Physics, 2015
Positron annihilation lifetime spectroscopy (PALS) is used to investigate polycrystalline substituted Li-ferrite samples. The dray ceramic technique was used to prepare all investigated samples. The variation of positron annihilation parameters I1%, I2%,
E. Hassan Aly, A.M. Samy
doaj   +1 more source

From polymer to SiOC glass: structure, microstructure, mechanical, and thermal properties

Journal of the American Ceramic Society, Volume 108, Issue 12, December 2025.
Abstract The transformation of a methyl‐siloxane into a SiOC glass in Ar and reactive CO2 atmosphere was studied through positron annihilation spectroscopy, infrared spectroscopy, density, and calorimetric measurements, whereas the mechanical properties were monitored by nanoindentation and the thermal diffusivity measured by the laser flash method ...
Mattia Biesuz, Adane M. Abebe, Levent Karacasulu, Sebastiano Mariazzi, Roberto S. Brusa, Daria Szewczyk, Nicola Pugno, Giacomo Sero, Maik Butterling, Maciej Oskar Liedke, Andreas Wagner, Eric Hirschmann, Michele Cassetta, Gian D. Sorarù   +13 more
wiley   +1 more source

Investigation of the fine structure of antihydrogen. [PDF]

, 2020
At the historic Shelter Island Conference on the Foundations of Quantum Mechanics in 1947, Willis Lamb reported an unexpected feature in the fine structure of atomic hydrogen: a separation of the 2S1/2 and 2P1/2 states1.
ALPHA Collaboration
core   +1 more source

$\gamma$-ray spectra and enhancement factors for positron annihilation spectra with core-electrons [PDF]

, 2015
Many-body theory is developed to calculate the $\gamma$-spectra for positron annihilation with valence and core electrons in the noble gas atoms. A proper inclusion of correlation effects and core annihilation provides for an accurate description of the ...
Green, D. G., Gribakin, G. F.
core   +2 more sources

Proposition of Hyper‐Chemical Exchange Saturation Transfer Subtraction Spectroscopy to Detect Very Weak and Broad Signals Hidden Under Baseline and Widen Range of Materials Accessed by Hyperpolarized 129Xe NMR

ChemPhysChem, Volume 26, Issue 23, November 28, 2025.
A polyimide sample, for which hyperpolarized 129Xe NMR spectroscopy failed to detect 129Xe embedded in the polymer (Inset A), is found to give a very broad peak, line width 11 kHz at 206.5 ppm, by applying the stopped‐flow hyper‐chemical exchange saturation transfer subtraction spectroscopy on the continuous‐flow recirculating hyper‐polarization system
Hideaki Fujiwara, Hirohiko Imai, Atsuomi Kimura   +2 more
wiley   +1 more source

Positron annihilation lifetime spectroscopy study of roller burnished magnesium alloy

Nukleonika, 2015
The effect of roller burnishing on Vickers’ hardness and positron lifetimes in the AZ91HP magnesium alloy was studied. The microhardness increases with an increase in the burnishing force and with a decrease in the feed. The comparison of various methods
Zaleski Radosław, Zaleski Kazimierz, Gorgol Marek   +2 more
doaj   +1 more source

Distribution of Positron Annihilation Lifetime Components

مجلة بغداد للعلوم, 2008
The intensities of the positron annihilation lifetime components are shown to be related to the free volume model, and the theoretical value of the ratio between the singlet to the triplet state intensities, described by the ratio η, is shown to follow ...
Ahmed Abdul-Razzaq Selman, Muna Ahmed Saeed   +1 more
doaj   +1 more source

GRIPS and the Perspective of Next-generation Gamma-ray Surveys

, 2011
GRIPS is one example of next generation telescopes proposed for astronomy the energy range between hard X-ray mirror instruments such as NuStar and the Fermi telescope.
Diehl, Roland
core   +1 more source

Direct Imaging of Hydrogen‐Driven Dislocation and Strain Field Evolution in a Stainless Steel Grain

Advanced Materials, Volume 37, Issue 45, November 13, 2025.
Using in situ Bragg coherent X‐ray diffraction imaging, 3D nanoscale strain maps of a stainless steel grain were measured during hydrogen charging. Results show dislocation relaxation and climb, elucidating the role of point defects in hydrogen‐modified deformation behavior.
David Yang, Mujan Seif, Guanze He, Kay Song, Adrien Morez, Benjamin de Jager, Dmytro Nykypanchuk, Ross J. Harder, Wonsuk Cha, Edmund Tarleton, Ian K. Robinson, Felix Hofmann   +11 more
wiley   +1 more source