Results 71 to 80 of about 558,215 (330)

Positron Confinement Characteristics of Dipole Field Configuration

南方能源建设
[Objective] This paper aims to reveal the confinement characteristics and loss mechanisms of positrons in a suspended dipole magnetic field, present an optimized method based on rotating electrode technology to achieve long-term and stable positron ...
Zhao WANG, Teng LIU, Zhiming YANG, Junjie DU, Guoshu ZHANG   +4 more
doaj   +1 more source

High Efficiency Cyclotron Trap Assisted Positron Moderator

Instruments, 2018
We report on the realisation of a cyclotron trap assisted positron tungsten moderator for the conversion of positrons with a broad keV–few MeV energy spectrum to a mono-energetic eV beam with an efficiency of 1.8(2)% defined as the ratio of the ...
Lars Gerchow, Saverio Braccini, Tommaso Stefano Carzaniga, David Cooke, Max Döbeli, Klaus Kirch, Ulli Köster, Arnold Müller, Nicholas P. van der Meulen, Christiaan Vermeulen, André Rubbia, Paolo Crivelli   +11 more
doaj   +1 more source

Configuration Interaction calculations of positron binding to Be(3Po)

, 2006
The Configuration Interaction method is applied to investigate the possibility of positron binding to the metastable beryllium (1s^22s2p 3Po) state. The largest calculation obtained an estimated energy that was unstable by 0.00014 Hartree with respect to
Andersen, Bashkin, Bressanini, Bromley, Bromley, Bromley, Bromley, Bromley, Bromley, Buckman, Carroll, Drachman, Dzuba, Goldanskii, Gribakin, Hill, J. Mitroy, Khare, M.W.J. Bromley, McNutt, Mitroy, Mitroy, Mitroy, Mitroy, Mitroy, Mitroy, Norcross, Paul, Ryzhikh, Ryzhikh, Saito, Schrader, Schrader, Schwartz, Stathopolous, Strasburger, Sullivan, Surko, Surko, Suzuki, Tachikawa, Varga   +41 more
core   +2 more sources

Defect Analysis of the β– to γ–Ga2O3 Phase Transition

Advanced Functional Materials, EarlyView.
The role of defects at all the relevant stages of the β$\beta$‐ to γ$\gamma$‐Ga2O3 polymorph transition is investigated using a multi method approach. The positron annihilation spectroscopy based results show that the defect density decreases after the transition, and that changes in defect configuration within the γ phase occur with increasing ...
Umutcan Bektas, Maciej O. Liedke, Huan Liu, Fabian Ganss, Maik Butterling, Nico Klingner, René Hübner, Ilja Makkonen, Andreas Wagner, Gregor Hlawacek   +9 more
wiley   +1 more source

Anomalous magnetic moment of the positronium ion

New Journal of Physics, 2014
We determine the gyromagnetic factor of the positronium ion, a three-body system consisting of two electrons and a positron, including first relativistic corrections. We find that the g -factor is modified by a term $-0.51\left( 1 \right){{\alpha }^{2}}$
Yi Liang, Paul L McGrath, Andrzej Czarnecki   +2 more
doaj   +1 more source

Ion‐Selective Microporous Membranes via One‐Step Copolymerization Enable High‐Performance Redox Flow Batteries

Advanced Functional Materials, EarlyView.
A scalable one‐step copolymerization strategy is developed to produce low‐cost microporous ion exchange membranes that boost both the efficiency and lifespan of flow batteries. When combined with organic electrolytes in aqueous systems, these membranes enable safe and cheap flow battery energy storage, supporting the widespread integration of renewable
Jiaye Liu, Chunchun Ye, Ying Ma, Rui Tan, Xiangwen Wang, Huiting Zhang, Peng Song, Quan‐Fu An   +7 more
wiley   +1 more source

Probing the Pulsar Origin of the Anomalous Positron Fraction with AMS-02 and Atmospheric Cherenkov Telescopes

, 2013
Recent observations by PAMELA, Fermi-LAT, and AMS-02 have conclusively indicated a rise in the cosmic-ray positron fraction above 10 GeV, a feature which is impossible to mimic under the paradigm of secondary positron production with self-consistent ...
Linden, Tim, Profumo, Stefano
core   +1 more source

Cold Quad‐Modal Nanocomplex for Precise and Quantitative In Vivo Stem Cell Tracking

Advanced Functional Materials, EarlyView.
Multimodal albumin–bismuth sulfide–superparamagnetic iron oxide (ABS) nanocomplexes are developed for stem cell tracking across four different imaging modalities: MRI, MPI, MSOT, and CT. Combining its flexibility with high sensitivity, this quad‐modal imaging agent enables a robust quantification of ABS‐labeled stem cells in vivo.
Ali Shakeri‐Zadeh, Chao Wang, Shreyas Kuddannaya, Saleem Yousf, Jeff W. M. Bulte   +4 more
wiley   +1 more source

CR electrons and positrons: what we have learned in the latest three years and future perspectives

, 2011
After the PAMELA finding of an increasing positron fraction above 10 GeV, the experimental evidence for the presence of a new electron and positron spectral component in the cosmic ray zoo has been recently confirmed by Fermi-LAT.
Gaggero, Daniele, Grasso, Dario
core   +1 more source

Preliminary Study of a Ninj1‐Loaded Bimodal Ultrasound/NIR Fluorescence Targeted Molecular Probe for Diagnosing Early‐Stage Inflammation in Coronary Microvascular Dysfunction

Advanced Healthcare Materials, EarlyView.
Coronary microvascular dysfunction (CMD) targeting remains a challenge for precise diagnosis. This work presents a dual‐modal nanoprobe (T‐IR780‐NBs) that combines ultrasound contrast with near‐infrared fluorescence. This technology utilizes proteomics‐derived antibodies that specifically localize to inflamed and injured cardiac tissue, enabling ...
Xiaohui Xu, Lina Guan, Baihetiya Tayier, Chen Yuan, Shangke Chen, Qi Shi, Yuming Mu   +6 more
wiley   +1 more source