Results 91 to 100 of about 9,908 (221)

Photon correlations in positron annihilation

, 2010
The two-photon positron annihilation density matrix is found to separate into a diagonal center of energy factor implying maximally entangled momenta, and a relative factor describing decay.
Isabelle Gauthier, J. J. Sakurai, M. O. Scully, Margaret Hawton   +3 more
core   +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

Catalytic Activity of Cobalt Ferrites in Water Oxidation Reactions and Its Defect Dependency

ChemCatChem, Volume 18, Issue 1, 15 January 2026.
Cobalt ferrite spinels calcined at 400–600 °C show temperature‐dependent changes in crystallinity, particle size, and defect concentration. A combination of PXRD, BET, SEM, Mössbauer spectroscopy, magnetometry, and PALS reveals how defect landscapes govern opposing trends in chemical versus electrochemical water oxidation.
Anna Rabe, Ahmed Gamal Attallah, Benedikt Eggert, Eric Hirschmann, Soma Salamon, Joachim Landers, Lea Kämmerer, Nicolas Cosanne, Adarsh Koul, Eko Budiyanto, Wolfgang Schuhmann, Malte Behrens, Heiko Wende   +12 more
wiley   +1 more source

Free Volume and Gas Permeation in Anthracene Maleimide-Based Polymers of Intrinsic Microporosity

Membranes, 2015
High free-volume copolymers were prepared via polycondensation with 2,3,5,6,-tetrafluoroterephthalonitrile (TFTPN) in which a portion of the 3,3,3',3'-tetramethyl-1,1'-spirobisindane (TTSBI) of PIM-1 was replaced with dibutyl anthracene maleimide (4bIII)
Muntazim Munir Khan, Volkan Filiz, Thomas Emmler, Volker Abetz, Toenjes Koschine, Klaus Rätzke, Franz Faupel, Werner Egger, Luca Ravelli   +8 more
doaj   +1 more source

Hydrogen response to high‐density dislocations in bulk perovskite oxide SrTiO3

Journal of the American Ceramic Society, Volume 109, Issue 1, January 2026.
High‐density dislocations are engineered into single‐crystal strontium titanate using cyclic Brinell indentation scratch tests at room temperature. These dislocations are found effective in uptaking hydrogen. Abstract Hydrogen plays an increasingly important role in green energy technologies. For instance, proton‐conducting oxides with high performance
Xufei Fang, Lars Dörrer, Svetlana Korneychuk, Maria Vrellou, Alexander Welle, Stefan Wagner, Astrid Pundt, Harald Schmidt, Christoph Kirchlechner   +8 more
wiley   +1 more source

Positron annihilation lifetime spectroscopy study on epoxy moisture absorption

Journal of Physics: Conference Series, 2013
Positron annihilation lifetime spectroscopy was used to study the effect of water uptake on the free volume of a commercial epoxy exposed to atmospheres with relative humidity ranging from 30.5% to 95.8%. The absorption process was also analyzed by gravimetric measurements.
Gordo, P. M., Luís, J. M. M., Marques, M. F. Ferreira, Naia, M. Duarte, Morais, J. J. M.   +4 more
openaire   +2 more sources

Selective TREF Fraction Removal: A Method to Enhance Crystallinity and Microhardness in Propylene–1‐Pentene Copolymers

Advances in Polymer Technology, Volume 2026, Issue 1, 2026.
Innovative advancements in polyolefin chemistries are critically important to develop industrial applications that require an ability of either superior performance levels or minimal expense. While temperature rising elution fractionation (TREF) is a well‐established analytical technique for characterising polyolefin heterogeneity, its use as a ...
Muhamed A. Sweed, Ali Almaktoof, Srijoni Sengupta   +2 more
wiley   +1 more source

Defects induced ferromagnetism in Mn doped ZnO

, 2010
Single phase Mn doped (2 at %) ZnO samples have been synthesized by solid-state reaction technique. Before the final sintering at 500 C, the mixed powders have been milled for different milling periods (6, 24, 48 and 96 hours).
A. Banerjee, A. Sarkar, Anghel, Behan, Blythe, Chattopadhyay, Chen, Dietl, Dutta, Dutta, Dutta, García, Hakeem, Heo, Hu, Karmakar, Khalid, Kim, Lin, Liu, M.D. Mukadam, Mi, Mukherjee, Panigrahy, Podila, Ramachandran, Rao, Roy, Rubi, S. Bandyopadhyay, S. Chattopadhyay, S.K. Neogi, S.M. Yusuf, Schwartz, Sharma, Straumal, Tuomisto, Wang, Wang, Wang, Weigand, Würschum, Xu, Yan, Yi, Zunger   +45 more
core   +1 more source

Research Progress of Microfluidics in Radiopharmaceutical Quality Control

iRADIOLOGY, Volume 3, Issue 6, Page 401-420, December 2025.
A complete PET imaging process includes five key steps: nuclide production, PET tracer synthesis, packaging, quality control and PET scanning. Taking the most classical synthesis process of [18F ]‐FDG tracer as an example, its synthesis process includes several core steps, such as: (1) the synthesis of [18F ]‐FDG Tracer, (2) the synthesis of [18F ]‐FDG
Zhenhao Dong, Qinggang He, Dilong Mao, Jing Wang, Hong Zhang   +4 more
wiley   +1 more source

The evidence of quasi-free positronium state in GiPS-AMOC spectra of glycerol

, 2013
We present the results of processing of Age-Momentum Correlation (AMOC) spectra that were measured for glycerol by the Gamma-induced positron spectroscopy (GiPS) facility.
Butterling, M., Krause-Rehberg, R., Stepanov, S. V., Wagner, A., Zvezhinskiy, D.   +4 more
core   +1 more source