A5018288724- Muon and positron interactions and applications
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Superconductivity in MgB2 and Alloys
- Superconducting Materials and Applications
- DNA and Nucleic Acid Chemistry
- Rare-earth and actinide compounds
- Graphene research and applications
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Chemical Physics Studies
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- Inorganic Chemistry and Materials
- Crystallography and molecular interactions
- Particle physics theoretical and experimental studies
- Organic and Molecular Conductors Research
- Magnetism in coordination complexes
- Nanocluster Synthesis and Applications
- Nuclear materials and radiation effects
- Advanced NMR Techniques and Applications
- High-pressure geophysics and materials
- Chemical Synthesis and Characterization
- Organic Chemistry Cycloaddition Reactions
- Free Radicals and Antioxidants
- Carbon and Quantum Dots Applications
Universiti Sains Malaysia
2015-2024
Hospital Universiti Sains Malaysia
1999-2023
RIKEN Nishina Center
2015-2022
RIKEN
2021
University of Malaya
2021
State University of Jakarta
2020
Management and Science University
2019
Gakushuin University
2017
University at Albany, State University of New York
1989-1997
Albany State University
1996
The aims of this study were to determine the most likely Mu trapping sites based on total energy consideration as well identifying associated muon hyperfine coupling constant 1, 2, and 3 methylated guanine-cytosine base pair double-strand DNA. Density Functional Theory method was used at B3LYP/6-31G level theory accomplish objectives investigation. relative in DNA molecule showed that N7 guanine have lowest energy, followed by N3, C8 sites. It found addition a methyl group C5 atom cytosine...
The most fundamental limitations of a muon-spin relaxation experiment can be the lack knowledge implantation site muon and uncertainty about muon's perturbation its host. Here we review some work done on 'muon problem' in solid state highlight recent applications electronic structure calculations that have successfully characterized quantum states muons number insulating compounds containing fluorine, pnictide superconductors, ZnO.
<p align="justify">This study aims to explore students’ perception of integrating education 4.0 in the Science program. The technology acceptance model was used determine understanding focusing on This research conducted using a qualitative approach. interview collect data. Five respondents among students were interviewed. They undergraduate pursue science finding result showed that had positive responses for technological sustainable development. results three aspects namely,...
A number of possible models for the anomalous muonium (${\mathrm{Mu}}^{\mathrm{*}}$) center in elemental semiconductors diamond, silicon, and germanium are investigated detail, both with respect to their stabilities abilities explain extensive available experimental hyperfine-interaction data, latter being major focus present work. Using unrestricted Hartree-Fock cluster procedure, electronic structures potential-energy curves associated muon positions obtained different models. The results...
Magnetic-ordered states of the pyrochlore iridates Nd2Ir2O7 (Nd227) and Sm2Ir2O7 (Sm227), showing metal–insulator transitions at 33 117 K, respectively, were studied by both muon-spin-relaxation (μSR) method density functional theory (DFT) calculations. A long-range magnetic ordering Ir moments appeared in conjunction with metal insulator transition, additional long-range-ordered Nd/Sm confirmed temperatures below about 10 K. We found that all-in all-out spin structure most convincingly...
Abstract Embracing education 4.0 in universities the Malaysian perspective has been limited to date and still considered at early stages of implementation. This paper aims analyze literature highlighting important elements as a means position them strategically for future. is provide new insight into exploration idea through how could embrace Since industrial revolution (IR4.0) brings huge impact on education, this helps policymakers their works developing transformation put more initiatives...
The location of the positive muon, used as a tool for probing magnetic properties high-${\mathit{T}}_{\mathit{c}}$ systems, is investigated ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$. Our calculations, using unrestricted Hartree-Fock cluster procedure, indicate that muon located in a-c plane, at distance 1.08 \AA{} from apical oxygen, with ${\mathrm{\ensuremath{\mu}}}^{+}$-O(a) direction making an angle 25\ifmmode^\circ\else\textdegree\fi{} O(a)-Cu direction. magnitude and hyperfine field...
The nuclear quadrupole interaction of $^{67}\mathrm{Zn}$ in the wurtzite structure for ZnO has been studied by Hartree-Fock cluster procedure including influence lattice charges outside chosen cluster. nature convergence electric-field gradient with choice basis set was and it found important to have a flexible p oxygen. Additionally, results using sets from neutral oxygen ${\mathrm{O}}^{2\mathrm{\ensuremath{-}}}$ Watson sphere were be comparable magnitude. Our calculated value coupling...
The unrestricted Hartree-Fock cluster procedure is used to study the electronic structure of ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$ and obtain $^{63}\mathrm{Cu}$ quadrupole coupling constant asymmetry parameter 88.4 MHz 0.04, respectively, in satisfactory agreement with experiment. A magnetic hyperfine field 105.2 kG obtained at nucleus, as compared 78.78 from effective charges on copper oxygen ions mixing planar orbitals wave functions suggest significant covalent bonding between them....
The on-site Coulomb potential, U, and the covalent state of electronic orbitals play key roles for Cooper pair symmetry exotic electromagnetic properties high-Tc superconducting cuprates. In this paper, we demonstrate a way to determine value U present whole picture Cu spins in mother system La-based cuprate, La2CuO4, by combining muon spin rotation (μSR) density functional theory (DFT) calculation. We reveal local deformations CuO6 octahedron followed changes Cu-spin distributions caused...
Muon positions in La2CuO4 were examined by using the density functional theory. Potential minimum near apical and plane oxygen have been determined as possible initial muon stopping positions. We found that final different from those due to effects of local deformation crystal structure which was induced injected muons. This means muons relax their deforming structures minimizing total energy system. also estimation had be done large scale area a supercell contained 27 unit cells order...
Numerical investigations on muon sites in Ce-based Kondo semiconductors, Ce(Ru,Rh)2Al10 were carried out by using the Density Functional Theory. From view point of simple electrostatic potential calculations, we found all previously reported sites, suggested different groups (Kambe S et al. 2010 J. Phys. Soc. Jpn. 79 053708 and Khalyavin D al., Rev. B 82 100405(R)), can be possibly chosen as stopping sites. We also investigated changes Rh-doped case. discovered that electronic around nearest...
The electrostatic potential has been investigated in YBa2Cu3O6 by applying the density functional theory order to estimate possible muon sites. We found five minimum positions around apical oxygen of CuO5 polyhedral. In addition those, we also another position near yttrium atom which is between CuO2 layers. Those estimated are different from those suggested previous μSR studies on basis dipole-field estimation.
A simple method using the descriptive statistics involving mean and standard deviation can be applied in questionnaire surveys. By focusing on reliability validity assessment, items should have roughly equivalent means deviations within a Likert scale with rule of thumb 2:1 (ratio maximum to minimum deviation). comprehensive study assess computer internet usages is presented illustrate how perform evaluation item-level (mean, frequency), multitrait/multi-item correlation matrix (Pearson...
This study aims to identify students’ learning styles of using mobile flipped classroom approach. The theoretical foundation for this is based on Grasha-Reichmann and the design Halili 4.0 framework. 52 respondents answered questionnaire distributed them. SPSS software version 20 was utilised analyse data collected were analyzed descriptive statistics (means, standard deviations). showed that collaborative style recorder higher mean value as compared others such independent, dependent,...
Density functional theory computational investigation was performed to study the electronic structures, muon sites, and associated hyperfine interactions in [Au25(SR)18]0 [Au25(SeR)18]0 where R is phenylethane. The calculated structures show inhomogeneous spin density distribution are also affected by different ligands. two most stable sites near Au atoms thiolated system MAu11 MAu6. When thiolate ligands were replaced selenolate ligands, lowest energy positions of muons moved MAu6 MAu5....
The electric-field gradients at $^{135}\mathrm{Ba}$ in ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6}$ and $^{139}\mathrm{La}$ ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$ have been investigated using the first-principles Hartree-Fock cluster procedure. calculated these nuclei lead to nuclear quadrupole coupling constants very good agreement with experiment. significance of this is discussed.
The Density Functional Theory method was employed to investigate the electronic structure and muonium hyperfine interaction of trapped near carbon atom labelled as '5' in cytosine nucleobase. Eighteen different basis sets combination with B3LYP functional were examined geometry optimization calculations on muoniated radical. There are significant quantitative differences calculated total energy. employment set that does not include polarization function produces an optimized high...
Density Functional Theory method at B3LYP/6-311++G(d,p) level of theory was successfully applied to investigate the structure, energy, and associated muonium hyperfine coupling constant radicals produced by addition DNA nitrogenous bases (guanine, adenine, cytosine, thymine) in nucleobase nucleotide forms. Based on DFT total lowest energy Mu sites are same: guanine (C8); adenine (C8 < N2); cytosine (N3 C5 C6); thymine (C6 O4). The values isotropic Fermi contact constant, Aiso purine does not...
A way to estimate muon sites in materials is reported. Since the has a positive charge, one easiest and conventional positions calculate minimum potential positions. We applied our developed method those some systems which have been studied by mons at RIKEN-RAL Muon Facility showed well defined muon-spin precession behavior magnetically ordered states. Tentative calculation results using density functional theory are