Results 71 to 80 of about 42,514 (244)

Investigation of Positron Annihilation Lifetime Spectroscopy and Tensile behavior of Graphene Oxide/Epoxy Nanocomposites [PDF]

Journal of Advanced Materials in Engineering
Introduction and Objectives: Positron Annihilation Lifetime Spectroscopy is a sensitive method for investigating the free volume in polymers at the atomic scale, enabling the determination of pore size, shape, and concentration.
Mohammad Koohkan, Ali Akbar Mehmandoost-Khajeh-Dad, Hamed Khosravi   +2 more
doaj   +1 more source

Systematics of positron lifetime spectroscopy measurements in ferroelectrics

Journal of Physics: Conference Series, 2020
Abstract In the paper is demonstrated the use of positron lifetime spectroscopy (PLS) in a comparative study of the results in ferroelectrics. The first part is devoted to the application of PLS as a probe for measurements of ferroelectrics.
Peneva, S, Troev, T, Kolev, B
openaire   +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

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

Uncovering the impact of the cardiovascular system on cerebrovascular health using MRI

Experimental Physiology, EarlyView.
Abstract Human cerebrovasculature is finely tuned to enable local changes in blood flow to meet the brain's demands, whilst protecting the brain from systemic changes in blood pressure, both acutely during a heartbeat and chronically over time. This review summarises cerebrovascular structure and function, their role in disease and neurodegeneration ...
Ian D. Driver, Kevin Murphy
wiley   +1 more source

Studies of unicellular microorganisms Saccharomyces cerevisiae by means of positron annihilation lifetime spectroscopy

Nukleonika, 2015
Results of positron annihilation lifetime spectroscopy (PALS) and microscopic studies on simple microorganisms, brewing yeasts, are presented. Lifetime of ortho-positronium (o-Ps) were found to change from 2.4 to 2.9 ns (longer-lived component) for ...
Kubicz Ewelina, Jasińska Bożena, Zgardzińska Bożena, Bednarski Tomasz, Białas Piotr, Czerwiński Eryk, Gajos Aleksander, Gorgol Marek, Kamińska Daria, Kapłon Łukasz, Kochanowski Andrzej, Korcyl Grzegorz, Kowalski Paweł, Kozik Tomasz, Krzemień Wojciech, Niedźwiecki Szymon, Pałka Marek, Raczyński Lech, Rajfur Zenon, Rudy Zbigniew, Rundel Oleksandr, Sharma Neha Gupta, Silarski Michał, Słomski Artur, Strzelecki Adam, Wieczorek Anna, Wiślicki Wojciech, Zieliński Marcin, Moskal Paweł   +28 more
doaj   +1 more source

On the positron annihilation spectroscopy and tensile behavior of COOH-MWCNT/epoxy nanocomposites [PDF]

Journal of Particle Science and Technology
Positron Annihilation Lifetime Spectroscopy (PALS) is sensitive to the material voids/free volume on the atomic scale. For this reason, this method has been used as a unique technology to measure the free volume and structural defects in polymers in ...
Mohammad Koohkan, Ali Akbar Mehmandoost Khajeh-Dad, Hamed Khosravi   +2 more
doaj   +1 more source

Influence of Heat Treatment on Defect Structures in Single-Crystalline Blade Roots Studied by X-ray Topography and Positron Annihilation Lifetime Spectroscopy

Metallurgical and Materials Transactions. A, 2018
Single-crystalline superalloy CMSX-4 is studied in the as-cast state and after heat treatment, with material being taken from turbine blade castings.
J. Krawczyk, W. Bogdanowicz, A. Hanc-Kuczkowska, A. Tondos, J. Sieniawski   +4 more
semanticscholar   +1 more source

Astrocytes: Orchestrators of brain gas exchange and oxygen homeostasis

The Journal of Physiology, EarlyView.
Abstract figure legend Oxygen and carbon dioxide enter the body via breathing; in the brain astrocytes play a key role balancing oxygen delivery with carbon dioxide removal. Abstract If we consider neurons like muscles during exercise, the demand for oxygen (O2) and carbon dioxide (CO2) elimination is constantly changing.
Isabel N. Christie
wiley   +1 more source

Nanocrystalline aluminum studied by positron annihilation lifetime spectroscopy

Acta Physica Sinica, 2014
Aluminum nanoparticles with an average diameter of about 48 nm are compressed in a cemented-carbide mold under different pressures to produce nanocrystalline aluminum by the hot-pressing technology in a high vacuum condition. The X-ray diffraction and the positron annihilation lifetime spectroscopy (PALS) are used to characterize the microscopic ...
null Li Yu, null Luo Jiang-Shan, null Wang Zhu, null Yang Meng-Sheng, null Xing Pi-Feng, null Yi Yong, null Lei Hai-Le   +6 more
openaire   +1 more source