Results 71 to 80 of about 494,691 (265)

Design and Implementation of a Digital Positron Annihilation Lifetime Spectrometer for Measurements in Graphite

, 2009
A digital Positron Annihilation Lifetime Spectrometer was designed and used to perform measurements on three graphite materials, reactor grade graphite, pyrolytic graphite, and a foam graphite developed by Oak Ridge National Laboratory.
Bodnaruk, Ethan Wesley
core  

Positron lifetime measurements and electronic structure of CeNiSn

, 2000
Positron lifetime measurements have been carried out in CeNiSn, in the temperature range of 5 to 300 K. In the 300 and 150-K temperature interval the positron lifetime is seen to decrease from 178±1 to 176±1 ps.
Hariharan, Y., Sundar, C. S., Bharathi, A.   +2 more
core   +1 more source

Generalized Beth–Uhlenbeck Entropy Formula From the Φ‐Derivable Approach

Contributions to Plasma Physics, EarlyView.
ABSTRACT We derive a generalized Beth–Uhlenbeck formula for the entropy of a dense fermion system with strong two‐particle correlations, including scattering states and bound states. We work within the Φ‐derivable approach to the thermodynamic potential.
David Blaschke, Gerd Röpke, Gordon Baym
wiley   +1 more source

Flexible Direct‐Conversion X‐Ray Detectors: From Emerging Materials to Conformal Imaging

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
This comprehensive review analyzed the performance, challenges, and future directions of four emerging material systems for next‐generation flexible direct‐conversion X‐ray detectors: organic semiconductors, perovskites, metal–organic frameworks, and inorganic metal compounds.
Haipeng Di, Guoliang Ma, Jiaxin Mu, Kailian Dong, Haibin Li, Manjing Wang, Xin Song, Haojin Li, Jianwei Xu, Yiying Zhao, Jingjing Zhao, Guojia Fang   +11 more
wiley   +1 more source

Positron unveiling high mobility graphene stack interfaces in Li-ion cathodes

Communications Materials
Carbon-based coatings in Li-ion battery cathodes improve electron conductivity and enable rapid charging. However, the mechanism is not well understood.
Meiying Zheng, Jan Kuriplach, Ilja Makkonen, Rafael Ferragut, Vito Di Noto, Gioele Pagot, Ekaterina Laakso, Bernardo Barbiellini   +7 more
doaj   +1 more source

Effect of Constraining the Source Lifetime Parameter during Least-square-fit Analysis on Positron Lifetime Measurements

, 2014
We examined the effect of constraining the positron source lifetime parameter during a least-square fitting (LSF) of positron annihilation lifetime (PAL) data on the resultant lifetimes, as determined from the fit result.
Yoshinori Kobayashi, Yoshihiro Watanabe, Masato Yamawaki, Kenji Ito, Kanehisa Hattori   +4 more
core   +1 more source

Progress report on new epilepsy treatments: A summary of the Eighteenth Eilat Conference on New Antiepileptic Drugs and Devices (EILAT XVIII). II. Treatments in more advanced clinical development

Epilepsia, EarlyView.
Abstract This article summarizes data for 13 investigational treatments for which at least preliminary seizure outcome data in patients with epilepsy were reported at the Eighteenth Eilat Conference on New Antiepileptic Drugs and Devices held in Madrid, Spain, on May 3–6, 2026.
Meir Bialer, Cecilie Johannessen Landmark, Matthias J. Koepp, Emilio Perucca, Piero Perucca, Torbjörn Tomson, H. Steve White, Elaine Wirrell   +7 more
wiley   +1 more source

Positronium lifetime validation measurements using a long-axial field-of-view positron emission tomography scanner

EJNMMI Physics
Background Positron emission tomography (PET) traditionally uses coincident annihilation photons emitted from a positron interacting with an electron to localize cancer within the body.
William M. Steinberger, Lorenzo Mercolli, Johannes Breuer, Hasan Sari, Szymon Parzych, Szymon Niedzwiecki, Gabriela Lapkiewicz, Pawel Moskal, Ewa Stepien, Axel Rominger, Kuangyu Shi, Maurizio Conti   +11 more
doaj   +1 more source

Positron-lifetime studies in the Kondo insulator FeSi

, 1997
Positron lifetime measurements have been carried out in the Kondo insulator FeSi in the temperature range of 5 K to 700 K. In the high temperature range of 500 K to 700 K, the lifetime is seen to increase rapidly from ~133±2 ps to ~141±2 ps, and is ...
Hariharan, Y., Sundar, C. S., Bharathi, A., Mani, Awadhesh   +3 more
core   +1 more source

Ventral anterior thalamic dysfunction distinguishes seizure generalization in temporal lobe epilepsy

Epilepsia, EarlyView.
Abstract Objective Focal‐to‐bilateral tonic–clonic seizures (FBTCS) in temporal lobe epilepsy (TLE) involve thalamocortical networks, yet the functional integrity and role of specific thalamic subregions in seizure generalization remain unclear. In this cross‐sectional study, we investigated whether thalamic subregion functional connectivity patterns ...
Stacy N. Hudgins, Michael R. Sperling, Hasan Ayaz, Joseph I. Tracy   +3 more
wiley   +1 more source