111 research outputs found
Comparative Study of Attitudes Toward Inclusive Settings Between Regular and Special Education Teachers in South Korea
Educational Psycholog
Multislice Electron Tomography using 4D-STEM
Electron tomography offers important three-dimensional (3D) structural
information which cannot be observed by two-dimensional imaging. By combining
annular dark field scanning transmission electron microscopy (ADF-STEM) with
aberration correction, the resolution of electron tomography has reached atomic
resolution. However, tomography based on ADF-STEM inherently suffers from
several issues, including a high electron dose requirement, poor contrast for
light elements, and artifacts from image contrast nonlinearity. Here, we
developed a new method called MultiSlice Electron Tomography (MSET) based on
4D-STEM tilt series. Our simulations show that multislice-based 3D
reconstruction can effectively reduce undesirable reconstruction artifacts from
the nonlinear contrast, allowing precise determination of atomic structures
with improved sensitivity for low-Z elements, at considerably low electron dose
conditions. We expect that the MSET method can be applied to a wide variety of
materials, including radiation-sensitive samples and materials containing light
elements whose 3D atomic structures have never been fully elucidated due to
electron dose limitations or nonlinear imaging contrast.Comment: 26 pages, 9 figure
A comprehensive study of vector leptoquark with on the -meson and Muon g-2 anomalies
Recently reported anomalies in various meson decays and also in the
anomalous magnetic moment of muon motivate us to consider a
particular extension of the standard model incorporating new interactions in
lepton and quark sectors simultaneously. Our minimal choice would be
leptoquark. In particular, we take vector leptoquark () and
comprehensively study all related observables including ${(g-2)_{\mu}},\
R_{K^{(*)}},\ R_{D^{(*)}}B \to (K) \ell \ell' \ell\ell'\mu\tau\tauU(1)_{B_3-L_2}$ gauge boson provides a common explanation of all these
anomalies.Comment: 16 pages, 3 figure
Selective Dissolution Characteristics of 26Cr-7Ni-2.5Mo-3W Duplex Stainless Steel in H 2 SO 4 /HCl Mixed Solution
Selective dissolution of hyper duplex stainless steel was studied by potentiodynamic and potentiostatic test in various concentrations of H 2 SO 4 /HCl solutions at various temperatures. There were two peaks in the active-to-passive transition region in potentiodynamic test in 2 M H 2 SO 4 + 0.5 M HCl solution at 60 C. In potentiostatic tests, the curve at À340 mV showed stable current density. As the potential increased, the current density increased and at above À310 mV potential, there was a much longer initial period of nonsteady current value. As the potential reached at À280 mV, the current density started to be stabilized and the current density was completely stabilized at À250 mV. It was found that a preferential dissolution of ferrite phase occurred at À330 mV and with the increase of potential, austenite phase was corroded at a high rate. On the other hand, both two phases were passivated at the potential above À270 mV, so that selective dissolution was absent
Correlation between low skeletal muscle index and 3D anthropometric data measured by 3D body scanner: screening sarcopenia
BackgroundThe screening tools for sarcopenia are measuring calf circumference, SARC-F or SPPB. However, not all of these tools have high sensitivity, specificity, and low margins of error. This research investigates potential of 3D anthropometry of the lower extremities on screening of sarcopenia.MethodsFrom October 2022 to February 2023, we retrospectively analyzed results of 3D body scanner and bio-impedance analysis for patients aged 45 to 85 at risk of sarcopenia. The 3D scanner measured the surface and volume values of both thighs and calves. When skeletal muscle index (SMI) is less than 5.7, patients were classified to Low SMI group, indicative of sarcopenia.ResultsA total six out of 62 patients were classified to Low SMI group, showing significantly lower values of right, left, mean calf volumes and mean calf surface than the other patients (right calf volume 2.62 L vs. 3.34 L, p = 0.033; left calf volume 2.62 L vs. 3.25 L, p = 0.044; mean calf volume 2.62 L vs. 3.29 L, p = 0.029; mean calf surface 0.12 m2 vs. 0.13 m2, p = 0.049). There was no statistical difference in thigh volume and surface. Through AUC-ROC analysis, mean calf volume was the most significant cut-off value (right calf volume 2.80 L, AUC = 0.768; left calf volume 2.75 L, AUC = 0.753; mean calf volume 3.06 L, AUC = 0.774; mean calf surface 0.12 m2, AUC = 0.747).ConclusionThe calf volume and surface values have significant relationship with low SMI, and the mean calf volume was the most significant cut-off screening value for Low SMI. The 3D scanner demonstrated its value as a new means for screening sarcopenia
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