Results 61 to 70 of about 55,721 (192)

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

ChemCatChem, EarlyView.
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

Cosmological Lower Bound on Dark Matter Masses from the Soft Gamma-ray Background [PDF]

, 2004
Motivated by a recent detection of 511 keV photons from the center of our Galaxy, we calculate the spectrum of the soft gamma-ray background of the redshifted 511 keV photons from cosmological halos.
A. Comastri, E. W. Kolb, Eiichiro Komatsu, J. A. Peacock, Kyungjin Ahn, P. Coles, Y. Fukada   +6 more
core   +1 more source

Positron Spectroscopy of Nanodiamonds after Hydrogen Sorption

Nanomaterials, 2018
The structure and defects of nanodiamonds influence the hydrogen sorption capacity. Positronium can be used as a sensor for detecting places with the most efficient capture of hydrogen atoms.
Lyudmila Nikitina, Roman Laptev, Yuri Abzaev, Andrey Lider, Alexander Ivashutenko   +4 more
doaj   +1 more source

Hadron pair production in semi-inclusive electron positron annihilation process at twist-4

European Physical Journal C: Particles and Fields, 2022
Fragmentation functions are important quantities in describing the hadronization process in high energy reactions. They can induce various azimuthal modulations which can be measured to reveal correlations between transverse momenta and polarizations ...
Weihua Yang
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

Positron Annihilation Spectroscopy in Materials and Technical Details of Measurement Systems [PDF]

فصلنامه علوم و فناوری فضایی, 2013
Being a very powerful method, Positron Annihilation Spectroscopy (PAS) has been widely used for investigation of defects type and concentration in materials in recent years.
A. A. Mehmandoost-Khajeh-Dad, M. Khaghani, M. Jafarzadeh-Khatibani   +2 more
doaj  

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

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

Quality of Heusler Single Crystals Examined by Depth Dependent Positron Annihilation Techniques

, 2014
Heusler compounds exhibit a wide range of different electronic ground states and are hence expected to be applicable as functional materials in novel electronic and spintronic devices.
Bauer, A, Böni, P, Ceeh, H, Eijt, S W H, Gigl, T, Hugenschmidt, C, Neubauer, A, Pfleiderer, C, Piochacz, C, Reiner, M, Schut, H, Weber, J   +11 more
core   +1 more source

Emerging applications of rare‐earth fluoride nanocrystals in medicine and biotechnologies

Responsive Materials, EarlyView.
Rare‐earth fluoride nanocrystals (REFNCs) exhibit high responsivity and can be used as multi‐modal agents in medicine and theranostics. This review summarizes recent advances in REFNCs, covering their synthesis, structures, luminescent properties, and applications in multi‐modal imaging and photodynamic therapy, highlighting their theranostic potential
Alain Tressaud, Zhichao Wang, Yuqi Tang, Quan Li   +3 more
wiley   +1 more source