Results 31 to 40 of about 3,908 (165)

Hypervision Proton Surgery: The Future Direction of Proton Therapy

iNew Medicine, EarlyView.
ABSTRACT Proton beams provide unique physical advantages characterized by a low entrance dose, negligible exit dose, and a sharp Bragg peak, which enable superior sparing of normal tissues and support safe dose escalation for improved tumor control. However, conventional photon‐based fractionation remains widely used in proton therapy, where prolonged ...
Li Li, Shuanghu Yuan
wiley   +1 more source

Comparison of the Coating Structure of Silicon‐Based PECVD Coatings With Varying Organic Content

Plasma Processes and Polymers, EarlyView.
Silicon‐based PECVD coatings transition abruptly from organic SiOCH to oxidic SiOx at ~32 at% silicon, exhibiting threshold behavior in barrier performance. Chemical composition seems to dominate over porosity: SiOx coatings unexpectedly show higher porosity yet superior barrier properties, possibly due to rigid cage‐like molecular structures ...
Jonas Franke, Maciej Oskar Liedke, Andreas Schäfer, Maik Butterling, Ahmed Gamal Attallah, Eric Hirschmann, Andreas Wagner, Rainer Dahlmann   +7 more
wiley   +1 more source

Effects of atomic electron momentum distribution on resonant dark sector production* [PDF]

EPJ Web of Conferences
Exploring resonant positron annihilation on atomic electrons offers a promising method for detecting light dark sector particles that interact with e+e− pairs.
Arias-Aragón Fernando, Darmè Luc, Grilli di Cortona Giovanni, Nardi Enrico   +3 more
doaj   +1 more source

Vacancy‐Type Defects in n‐Type GaN Fabricated by Low‐Dose Ion Implantation Studied by a Monoenergetic Positron Beam

physica status solidi (b), EarlyView.
Vacancies in low‐dose ion‐implanted GaN are studied by positron annihilation. Depth profiles of the net donor concentration (ND) are close to those for implanted impurities, but ND is 2–3 times higher than concentrations of implanted ions. The origin of donor‐like defects is expected to be N‐vacancy‐related defects, and Ga‐vacancy‐type defects play a ...
Akira Uedono, Hiroko Iguchi, Masahiro Horita, Jun Suda, Kohei Shima, Shigefusa F. Chichibu, Shoji Ishibashi   +6 more
wiley   +1 more source

Unveiling atomic electron motion effects in e + e − high energy collisions at NA64

Journal of High Energy Physics
Atomic electron motion is responsible for well-studied effects observed in low-energy (MeV-scale) processes. Recently, interest in this phenomenon has also emerged within the high-energy physics community, due to its potential to increase significantly ...
Fernando Arias-Aragón, Giovanni Grilli di Cortona, Enrico Nardi   +2 more
doaj   +1 more source

Nuclear excitation at the positron annihilation taking into account the radiative corrections [PDF]

Ядерна фізика та енергетика, 2006
The process of nuclear excitation at the positron-atomic electron annihilation was considered. The relative contribution nonradiative versus radiative was analysed.
S. N. Fedotkin, V. A. Zheltonozhskii
doaj  

Review of physics program at J-PET [PDF]

EPJ Web of Conferences
The Jagiellonian - Positron Emission Tomograph (J-PET) is a multi purpose detector for tests of discrete symmetries and quantum entanglement of photons originating from the decay of positronium atoms.
Czerwiński Eryk
doaj   +1 more source

Structural and Transport Properties of Thick and Thin Cr2AlC Films

physica status solidi (RRL) – Rapid Research Letters, EarlyView.
This study compares structural and transport properties of Cr2AlC thin films (50 and 500 nm) systematically disordered by ion irradiation. Columnar grain growth is observed only in 500 nm films, while both films exhibit a weak fiber texture. Kondo scattering from displaced Cr atoms leads to a resistivity upturn, with distinct magnetoresistance in each ...
João Salgado Cabaço, Fabian Ganss, Javier Pablo‐Navarro, César Magén, Manuel Ricardo Ibarra, Marcin Perzanowski, Ulrich Kentsch, Jürgen Lindner, Jürgen Faßbender, Christoph Leyens, Richard Boucher, Rantej Bali   +11 more
wiley   +1 more source

Linking Density and Nanoscale Crystallinity to Hydration in Nafion PEMFC Membranes: Insights From Experiment and Molecular Dynamics Simulations

Small Structures, EarlyView.
Molecular dynamics and experimental analysis show that higher crystallinity in Nafion enhances molecular packing, thereby increasing effective density. A proposed model bridges experimental and molecular‐scale observations by quantitatively linking water uptake to density variations, offering a predictive framework for optimising hydration and ...
Mateja Jovanović, Nicolas Bernhard, Matthias Baldofski, Marcin Rybicki, Miljan Dašić, Igor Stanković   +5 more
wiley   +1 more source

Low-energy supernova constraints on millicharged particles

Journal of High Energy Physics
The hot and dense conditions of the supernova core provide an ideal environment for the production of new feebly-interacting particles. Low-energy supernovae, characterized by low explosion energy, are particularly intriguing due to their stringent ...
Changqian Li, Zuowei Liu, Wenxi Lu, Zicheng Ye   +3 more
doaj   +1 more source