A5101925941- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Transition Metal Oxide Nanomaterials
- Catalysis and Hydrodesulfurization Studies
- Physics of Superconductivity and Magnetism
- Advanced DC-DC Converters
- Magnetic confinement fusion research
- Electronic and Structural Properties of Oxides
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Crystallization and Solubility Studies
- Multilevel Inverters and Converters
- ZnO doping and properties
- X-ray Diffraction in Crystallography
- Advanced Chemical Physics Studies
- Particle Accelerators and Free-Electron Lasers
- Electrocatalysts for Energy Conversion
- Astrophysics and Star Formation Studies
- Induction Heating and Inverter Technology
- Radio Astronomy Observations and Technology
- Advancements in Battery Materials
Nagoya University
2025
Korea Institute of Fusion Energy
2016-2023
Argonne National Laboratory
2011-2022
Northwestern University
2013-2022
Sejong University
2016-2021
Alex's Lemonade Stand Foundation
2017-2018
The University of Melbourne
2016
ARC Centre of Excellence for All-sky Astrophysics
2016
MacDiarmid Institute for Advanced Materials and Nanotechnology
2013
University of Canterbury
2013
This study reports the highly selective (more than 95%) dehydrogenation of propane to propylene as well reverse hydrogenation reaction by silica-supported single-site Zn(II) catalyst. The catalyst is thermally stable at temperature (550 °C and above), catalytic byproducts are small. In situ UV-resonance Raman, XANES, EXAFS spectra reveal that tetrahedrally coordinated ions chemisorbed into strained three-membered siloxane rings on amorphous silica surface. Under conditions, ion loses one...
Cu-exchanged small-pore zeolites (CHA and AEI) form methanol from methane (>95% selectivity) using a 3-step cyclic procedure (Wulfers et al. Chem. Commun. 2015, 51, 4447−4450) with amounts higher than Cu-ZSM-5 Cu-mordenite on per gram Cu basis. Here, the CuxOy species formed Cu-SSZ-13 Cu-SSZ-39 following O2 or He activation at 450 °C are identified as trans-μ-1,2-peroxo dicopper(II) ([Cu2O2]2+) mono-(μ-oxo) ([Cu2O]2+) synchrotron X-ray diffraction, in situ UV–vis, Raman spectroscopy theory....
Studies on photovoltaic systems are increasing because of a large, secure, essentially exhaustible and broadly available resource as future energy supply. However, the output power induced in modules is influenced by an intensity solar cell radiation, temperature cells so on. Therefore, to maximize efficiency renewable system, it necessary track maximum point input source. In this paper, new tracker (MPPT) using fuzzy set theory proposed improve conversion efficiency. A algorithm based...
Vanadia species on aluminas (delta- and gamma-Al2O3) with surface VOx density in the range 0.01-14.2 V/nm2 have been characterized by UV visible Raman spectroscopy, UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), temperature-programmed reduction hydrogen. It is shown that alumina phase has little influence structure reducibility of under either dehydrated or hydrated conditions. Three similar types dispersed species, i.e., monovanadates, polyvanadates, V2O5, are identified both...
Raman spectroscopy was used to demonstrate that the lattice dynamics of SrTiO3 (STO) nanoparticles strongly depends on their microstructure, which is in turn determined by synthetic approach employed. First-order modes are observed at room temperature STO single-crystalline nanocubes with average edge lengths 60 and 120 nm, obtained via sol-precipitation coupled hydrothermal synthesis a molten salt procedure, respectively. scattering arises from local loss inversion symmetry caused surface...
We present first results from radio observations with the Murchison Widefield Array seeking to constrain power spectrum of 21 cm brightness temperature fluctuations between redshifts 11.6 and 17.9 (113 75 MHz). 3 h were conducted over two nights significantly different levels ionospheric activity. use these data assess impact systematic errors at low frequency, including ionosphere radio-frequency interference, on a measurement. find that after 1–3 integration presented here, our...
We present the 21 cm power spectrum analysis approach of Murchison Widefield Array Epoch Reionization project. In this paper, we compare outputs multiple pipelines for purpose validating statistical limits cosmological hydrogen at redshifts between 6 and 12. Multiple, independent, data calibration reduction are used to make on a fiducial night data. Comparing imaging stages highlights differences in calibration, foreground subtraction calculation. The spectra found using these different...
Organic cathode materials are promising for developing high-energy and high-power Li-ion batteries (LIBs). However, the energy storage of most organic cathodes relies on electron transfer a single type functional group, leading to either low redox potential or capacity. Here we propose new strategy structure design performance optimization materials. A cathode, dithianon (DTN), containing three groups (−S–, C═O, C≡N) in one framework, is reported. The −S– group increases 3.0 V, while C═O C≡N...
Non-noble-metal, thin-film oxides are widely investigated as promising catalysts for oxygen evolution reactions (OER). Amorphous cobalt oxide films electrochemically formed in the presence of borate (CoBi) and phosphate (CoPi) share a common cobaltate domain building block, but differ significantly OER performance that derives from different electron–proton charge transport properties. Here, we use combination L edge synchrotron X-ray absorption (XAS), resonant emission (RXES), inelastic...
Bone morphogenetic proteins (BMPs) are well-studied regulators of cartilage and bone development that have been Food Drug Administration (FDA)-approved for the promotion formation in certain procedures. BMPs seeing more use oral maxillofacial surgeries because recent FDA approval InFUSE ® sinus augmentation localized alveolar ridge augmentation. However, utility medical dental applications is limited by delivery method. Currently, delivered to surgical site implantation bulky collagen...
We report the first observation of infrared emission from a gaseous ionic polycyclic aromatic hydrocarbon (PAH), pyrene cation, over range wavelengths spanned by ubiquitous interstellar unidentified bands (UIRs). The complete set cation IR emissions is observed, with relative intensities consistent astrophysical observations, supporting proposal that ionized PAHs are major contributors to UIR bands. Additionally, features possibly arising dehydrogenated PAH species noted in spectrum.
A neural network solving Grad-Shafranov equation constrained with measured magnetic signals to reconstruct equilibria in real time is developed. Database created optimize the network's free parameters contain off-line EFIT results as output of from $1,118$ KSTAR experimental discharges two different campaigns. Input data constitute by a Rogowski coil (plasma current), pick-up coils (normal and tangential components fields) flux loops (poloidal fluxes). The developed networks fully not only...
This paper proposes an improved ZVT-PWM boost converter. The main switch of the conventional converter is always switched at zero voltage. But auxiliary turned-off with switching loss due to hard condition. Therefore, proposed reduces turn-off by using additional circuit. All losses for switches are minimized, and high power density system can be realized.
We describe the characterization of an unknown and difficult to identify but geochemically environmentally significant MnOx structure produced by a freshwater bacterium, Leptothrix discophora SP-6, using combined transmission electron microscopy (TEM), extended X-ray absorption fine (EXAFS), UV Raman spectroscopy. The large surface-to-volume ratio needle-shaped nanocrystalline MnO2 formed around bacterial cells coupled porous, zeolite-like has potential catalyze reactions oxidize adsorb metals.
Infrared emission spectra of five gas-phase UV laser-excited polycyclic aromatic hydrocarbons (PAHs) containing aliphatic hydrogens are compared with the main 3.3 μm and associated interstellar unidentified infrared bands (UIRs). We show that neutral PAHs can account for majority 3 complex while making little contribution to other UIR bands; peripherally hydrogenated produce a better match astrophysical data than do those methyl side groups; 3.4 plateau is shown be general spectral feature...
A combined experimental and theoretical study of vanadium oxide monomers on a θ-alumina surface under different environments has identified four structures. Deep UV Raman results suggest that vanadia is attached predominantly to an aluminum site was isolated terminal Al−OH group the surface. The preresonance spectra for supported with very low VOx density show three distinct V═O bands dehydrated conditions. observed frequencies match well calculated stretching from B3LYP functional theory...
In order to fabricate long-length high temperature superconducting coated conductors, we have employed a batch-type reactive co-evaporation process for the deposition of SmBCO layer on IBAD-MgO substrate LaMnO3/epi-MgO/IBAD-MgO/Y2O3/Al2O3/Hastelloy. Critical current densities (Jc) conductors were investigated with respect their composition ratios. Higher Jc was obtained in Sm-rich, Ba-poor and Cu-rich region, compared stoichiometric region. The highest critical transition (Tc) conductor ∼94...
The substitution of chromium into the composite Li<sub>2</sub>MnO<sub>3</sub>·LiNi<sub>1/2</sub>Mn<sub>1/2</sub>O<sub>2</sub> cathode dramatically affects initial electrochemical activation process; however voltage fade process during cycling persists.
Molecularly derived single-site heterogeneous catalysts can bridge the understanding and performance gaps between conventional homogeneous catalysis, guiding rational design of next-generation catalysts. While impressive advances have been made with well-defined oxide supports, structural complexity other supports nature grafted surface species present an intriguing challenge. In this study, Mo(═O)2 onto reduced graphene (rGO/MoO2) are characterized by XPS, DRIFTS, powder XRD, N2...