Results 61 to 70 of about 245,057 (208)

Quasi-real-time range monitoring by in-beam PET: a case for 15O

Scientific Reports, 2023
A fast and reliable range monitoring method is required to take full advantage of the high linear energy transfer provided by therapeutic ion beams like carbon and oxygen while minimizing damage to healthy tissue due to range uncertainties.
S. Purushothaman, D. Kostyleva, P. Dendooven, E. Haettner, H. Geissel, C. Schuy, U. Weber, D. Boscolo, T. Dickel, C. Graeff, C. Hornung, E. Kazantseva, N. Kuzminchuk-Feuerstein, I. Mukha, S. Pietri, H. Roesch, Y. K. Tanaka, J. Zhao, M. Durante, K. Parodi, C. Scheidenberger   +20 more
doaj   +1 more source

New limits on dark matter annihilation from Alpha Magnetic Spectrometer cosmic ray positron data. [PDF]

Physical Review Letters, 2013
The Alpha Magnetic Spectrometer experiment onboard the International Space Station has recently provided cosmic ray electron and positron data with unprecedented precision in the range from 0.5 to 350 GeV.
L. Bergström, T. Bringmann, I. Cholis, D. Hooper, C. Weniger   +4 more
semanticscholar   +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

Detection of Atomic Scale Changes in the Free Volume Void Size of Three-Dimensional Colorectal Cancer Cell Culture Using Positron Annihilation Lifetime Spectroscopy

PLoS ONE, 2014
Positron annihilation lifetime spectroscopy (PALS) provides a direct measurement of the free volume void sizes in polymers and biological systems. This free volume is critical in explaining and understanding physical and mechanical properties of polymers.
E. Axpe, Tamara López-Euba, A. Castellanos-Rubio, D. Mérida, J. García, Leticia Plaza-Izurieta, N. Fernández-Jiménez, F. Plazaola, J. Bilbao   +8 more
semanticscholar   +1 more source

The plasticisation model of dye diffusion: Part 5

Coloration Technology, EarlyView.
Abstract The findings presented in the previous part of the paper (Part 4) of the re‐evaluation of previously published data reported for the temperature‐dependent diffusion of an organic acid within nylon 6 film, desorption of three acid dyes from dyed nylon 66 fabric, diffusion of an acid dye within nylon 6 monofilaments and adsorption of a sulphur ...
Stephen M. Burkinshaw
wiley   +1 more source

Molecular Cages Based Materials for CO2 Capture, Separation, and Conversion

EcoMat, Volume 8, Issue 2, February 2026.
Molecular cages (MCs), boasting soluble, regenerable traits and precisely tunable structures, exhibit substantial potential for efficient CO2 capture, separation, and conversion. This review thoroughly explores MCs' recent advancements, analyzes current unresolved challenges, and provides forward‐looking perspectives to tackle pressing carbon‐related ...
Ding Zou, Bin Ai, Yanni Zhang, Xiaoyu Cao, Hongyu Zhen   +4 more
wiley   +1 more source

Chemically Accurate Prediction of CO2 Adsorption Thermodynamics in Metal–Organic Framework CALF‐20: Complementary Ab Initio Modeling and Grand Canonical Monte Carlo Simulations

Small Structures, Volume 7, Issue 2, February 2026.
Ab initio thermodynamics and GCMC simulations reveal a cooperative two‐step CO2 pore filling mechanism in CALF‐20. The study captures adsorption energetics and loading‐dependent structural changes, reproducing experimental isotherms with chemically accurate predictions.
Kaido Sillar, Sonja Grubišić, Ivana S. Đorđević, Majdi Hochlaf   +3 more
wiley   +1 more source

Positron-electron annihilation momentum transfer to trapped deuterons

AIP Advances, 2019
The probability of positron annihilation momentum transfer to a trapped deuteron is calculated based on neutron measurements from 2H(d,n)3He reactions in deuterated palladium thin films. Deuterium gas loading in Pd thin films creates a high D/Pd fraction
Ryan Weed, Dante Sblendorio, Joshua Machacek, Bala Ramamurthy, Gabrielle Laguisma   +4 more
doaj   +1 more source

Surfaces of colloidal PbSe nanocrystals probed by thin-film positron annihilation spectroscopy

APL Materials, 2013
Positron annihilation lifetime spectroscopy and positron-electron momentum density (PEMD) studies on multilayers of PbSe nanocrystals (NCs), supported by transmission electron microscopy, show that positrons are strongly trapped at NC surfaces, where ...
L. Chai, W. Al-Sawai, Y. Gao, A. J. Houtepen, P. E. Mijnarends, B. Barbiellini, H. Schut, L. C. van Schaarenburg, M. A. van Huis, L. Ravelli, W. Egger, S. Kaprzyk, A. Bansil, S. W. H. Eijt   +13 more
doaj   +1 more source

Simultaneous quantitative imaging of two PET radiotracers via the detection of positron–electron annihilation and prompt gamma emissions

Nature Biomedical Engineering, 2023
E. Pratt, A. López-Montes, A. Volpe, M. Crowley, L. Carter, V. Mittal, N. Pillarsetty, V. Ponomarev, José Manuel Udías, J. Grimm, J. Herraiz   +10 more
semanticscholar   +1 more source