Two new MAX compounds, (Cr2/3Ti1/3)3AlC2 and (Cr5/8Ti3/8)4AlC3, were successfully synthesized by hot‐pressing elemental powders at 1500°C for 1 h under 30 MPa in a flowing argon atmosphere. Their ...crystal structures were indentified and characterized by X‐ray diffraction and transmission electron microscopy analysis. (Cr2/3Ti1/3)3AlC2 and (Cr5/8Ti3/8)4AlC3 have the same crystal structures with the well‐characterized Ti3AlC2 and Ti4AlN3, respectively.
The hydriding/dehydriding characteristics of 90 wt% MgH2a10 wt% MeSi2 (Me = Ti, Cr) composites, synthesized by ball milling under argon, were studied by Sievertas type apparatus and by high-pressure ...differential scanning calorimetry (HPDSC). The composites have demonstrated similar absorption kinetics and capacity at temperature of 300 degree C and a pressure of 1 MPa. They showed fast kinetics and achieved absorption capacity higher than 6 wt%. Slightly higher values for the enthalpy of hydriding and dehydriding were obtained at scanning conditions in the HPDSC for the composite 90 wt% MgH2a10 wt% CrSi2 compared to those for the composite with addition of TiSi2.
Li sub(0.33)La sub(0.55)TiO sub(3) solid electrolytes with a pure phase were synthesized by the citric acid-supported sol-gel method and then sintered under controlled redox atmospheres of air, argon ...and hydrogen. Although of similar morphology and relative density, Li sub(0.33)La sub(0.55)TiO sub(3) samples sintered under reduction atmosphere such as argon and hydrogen exhibited a tetragonal structure with lattice distortion. The distortion and volume expansion of the crystal lattice was identified as originating from the transformation of the Ti valence state, and this was more clearly observed under sintering of the hydrogen atmosphere. The qualitative analysis of the Ti valence state using an X-ray Photoelectron Spectroscopy experiment was performed and indicated that the largest amount of Ti super(3+)(18.6%) was formed in the Li sub(0.33)La sub(0.55)TiO sub(3) samples sintered under hydrogen atmosphere. The relationship between the lattice distortion and the lithium ion conductivity of the Li sub(0.33)La sub(0.55)TiO sub(3) sintered under different atmospheres is also discussed on the basis of the lattice distortion.
A new compound Er sub(3)Co sub(4)Al sub(12 ) was prepared by arc melting under argon atmosphere. The powder X-ray diffraction data of Er sub(3)Co sub(4)Al sub(12 ) were successfully indexed, giving a ...hexagonal structure with a = 8.6185(2) Aa, c = 9.2347(3) Aa, and unit-cell volume V = 594.04 Aa super(3). Compound Er sub(3)Co sub(4)Al sub(12 ) has the Gd sub(3)Ru sub(4)Al sub(12 ) type-structure, Z = 2 and space group P6 sub(3)/mmc.
Particle detectors based on liquid argon (LAr) have recently become recognized as an extremely attractive technology for the direct detection of dark matter as well as the measurement of coherent ...elastic neutrino–nucleus scattering (CEνNS). The Chinese argon group at Institute of High Energy Physics has been studying the LAr detector technology and a LAr detector has been operating steadily. A program of using a dual phase LAr detector to measure the CEνNS at Taishang Nuclear Power Plant has been proposed and the R&D work is ongoing. Considering the requirements of ultra-low radio-purity and high photon collection efficiency, SiPMs will be a good choice and will be used in the detector. In this proceeding, an introduction of the LAr detector and the measurement results of SiPM array at LAr temperature will be presented.
CaTS: Integration of Geant4 and Opticks Wenzel, Hans; Jun, Soon Yung; Genser, Krzysztof ...
EPJ Web of Conferences,
01/2024, Letnik:
295
Conference Proceeding, Journal Article
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CaTS 6is an advanced example that is part of Geant4 since version 11.0. It demonstrates the use of Opticks to offload the simulation of optical photons to GPUs. Opticks interfaces with the Geant4 ...toolkit to collect all the necessary information to generate and trace optical photons, re-implements the optical physics processes to be run on the GPU, and automatically translates the Geant4 geometry into a GPU appropriate format. To trace the photons, Opticks uses NVIDIA OptiX®. In this report, we describe CaTS and the integration of Opticks with Geant4. We demonstrate that the generation and tracing of optical photons represents an ideal application to be offloaded to GPUs, fully utilizing the high degree of available parallelism. In a typical liquid argon TPC simulation, a speedup of several hundred times is observed compared to an equivalent simulation using single threaded Geant4.
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