148 research outputs found
Correction to Metallic 1T Phase, 3d1 Electronic Configuration and Charge Density Wave Order in Molecular-Beam Epitaxy Grown Monolayer Vanadium Ditelluride.
It has been brought to our attention that a mistake exists in the author list. The author âJohnson Gohâ in the original article should be âKuan Eng Johnson Gohâ. His primary corresponding email is [email protected]
LâOccidente secondo Taiwan. Occidente, cultura occidentale e cristianesimo nelle opinioni dei taiwanesi
Esiti di una ricerca su Taiwan e i rapporti con il mondo occidentale, passati e presenti, con particolare riferimento alla dimensione della presenza del cristianesimo e della cultura occidentale nei media e nellâopinione pubblica taiwanese.- Indice #5- Introduzione #9- Cap.I Taiwan incontra lâOccidente: passato e presente #13- Cap.II LâOccidente e il cristianesimo nei libri di testo #33- Cap.III La chiesa cattolica nei giornali di Taiwan #121- Cap.IV Le opinioni della gente sullâOccidente e sul cristianesimo #145- Cap.V Commenti ai risultati della ricerca #24
Erratum:Metallic 1T phase, 3d<sup>1</sup> electronic configuration and charge density wave order in molecular-beam epitaxy grown monolayer vanadium ditelluride (ACS Nano (2019) 13:11 (12894â12900) DOI: 10.1021/acsnano.9b05349)
Evidence for metallic 1T phase, 3d1 electronic configuration and charge density wave order in molecular-beam epitaxy grown monolayer VTe2
We present a combined experimental and theoretical study of monolayer VTe2
grown on highly oriented pyrolytic graphite by molecular-beam epitaxy. Using
various in-situ microscopic and spectroscopic techniques, including scanning
tunneling microscopy/spectroscopy, synchrotron X-ray and angle-resolved
photoemission, and X-ray absorption, together with theoretical analysis by
density functional theory calculations, we demonstrate direct evidence of the
metallic 1T phase and 3d1 electronic configuration in monolayer VTe2 that also
features a (4 x 4) charge density wave order at low temperatures. In contrast
to previous theoretical predictions, our element-specific characterization by
X-ray magnetic circular dichroism rules out a ferromagnetic order intrinsic to
the monolayer. Our findings provide essential knowledge necessary for
understanding this interesting yet less explored metallic monolayer in the
emerging family of van der Waals magnets.Comment: 21 pages, 5 figure
Emerged HA and NA Mutants of the Pandemic Influenza H1N1 Viruses with Increasing Epidemiological Significance in Taipei and Kaohsiung, Taiwan, 2009â10
The 2009 influenza pandemic provided an opportunity to observe dynamic changes of the hemagglutinin (HA) and neuraminidase (NA) of pH1N1 strains that spread in two metropolitan areas -Taipei and Kaohsiung. We observed cumulative increases of amino acid substitutions of both HA and NA that were higher in the postâpeak than in the pre-peak period of the epidemic. About 14.94% and 3.44% of 174 isolates had one and two amino acids changes, respective, in the four antigenic sites. One unique adaptive mutation of HA2 (E374K) was first detected three weeks before the epidemic peak. This mutation evolved through the epidemic, and finally emerged as the major circulated strain, with significantly higher frequency in the post-peak period than in the pre-peak (64.65% vs 9.28%, p<0.0001). E374K persisted until ten months post-nationwide vaccination without further antigenic changes (e.g. prior to the highest selective pressure). In public health measures, the epidemic peaked at seven weeks after oseltamivir treatment was initiated. The emerging E374K mutants spread before the first peak of school class suspension, extended their survival in high-density population areas before vaccination, dominated in the second wave of class suspension, and were fixed as herd immunity developed. The tempo-spatial spreading of E374K mutants was more concentrated during the postâpeak (pâ=â0.000004) in seven districts with higher spatial clusters (p<0.001). This is the first study examining viral changes during the naĂŻve phase of a pandemic of influenza through integrated virological/serological/clinical surveillance, tempo-spatial analysis, and intervention policies. The vaccination increased the percentage of E374K mutants (22.86% vs 72.34%, p<0.001) and significantly elevated the frequency of mutations in Sa antigenic site (2.36% vs 23.40%, p<0.001). Future pre-vaccination public health efforts should monitor amino acids of HA and NA of pandemic influenza viruses isolated at exponential and peak phases in areas with high cluster cases
Effects of Transapical Transcatheter Mitral Valve Implantation
Purpose: In this study, transapical transcatheter mitral valve-in-valve implantation (TAMVI) was compared with surgical redo mitral valve replacement (SRMVR) in terms of clinical outcomes.Methods: We retrospectively identified patients with degenerated mitral bioprosthesis or failed annuloplasty rings who underwent redo SRMVR or TAMVI at our medical center. Clinical outcomes were based on echocardiography results.Results: We retrospectively identified patients with symptomatic mitral bioprosthetic valve dysfunction (n = 58) and failed annuloplasty rings (n = 14) who underwent redo SRMVR (n = 36) or TAMVI (n = 36). The Society of Thoracic Surgeons Predicted Risk of Mortality scores were higher in the TAMVI group (median: 9.52) than in the SRMVR group (median: 5.59) (p-value = 0.02). TAMVI patients were more severe in New York Heart Association (p-value = 0.04). The total procedure time (skin to skin) and length of stay after procedures were significantly shorter in the TAMVI group, and no significant difference in mortality was noted after adjustment for confounding factors (p-value = 0.11). The overall mean mitral valve pressure gradient was lower in the TAMVI group than in the SRMVR group at 24 months (p < 0.01). Both groups presented a decrease in the severity of mitral and tricuspid regurgitation at 3â24 months.Conclusions: In conclusion, the statistical analysis is still not robust enough to make a claim that TAMVI is an appropriate alternative. The outcome of the patient appears only to be related to the patient's pre-operative STS score. Additional multi-center, longitudinal studies are warranted to adequately assess the effect of TAMVI
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Gastric cancer-derived mesenchymal stem cells prompt gastric cancer progression through secretion of interleukin-8
Search for dark matter produced in association with bottom or top quarks in âs = 13 TeV pp collisions with the ATLAS detector
A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fbâ1 of protonâproton collision data recorded by the ATLAS experiment at âs = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements
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