602 research outputs found
sj-docx-1-wso-10.1177_17474930231159779 – Supplemental material for Gender differences in mortality and long-term functional outcomes after first-ever ischemic stroke: A prospective cohort study
No full textSupplemental material, sj-docx-1-wso-10.1177_17474930231159779 for Gender differences in mortality and long-term functional outcomes after first-ever ischemic stroke: A prospective cohort study by Sang Moon Yun, Seyoung Shin, Won Hyuk Chang, Deog Young Kim, Jongmin Lee, Min Kyun Sohn, Min-Keun Song, Yong-Il Shin, Yang-Soo Lee, Min Cheol Joo, So Young Lee, Junhee Han, Jeonghoon Ahn, Gyung-Jae Oh and Yun-Hee Kim in International Journal of Stroke</p
Application of time reversal guided waves to field bridge testing for baseline free damage diagnosis
No full textThis research is partially supported by Pennsylvania Infrastructure Technology Alliance (PITA) Program and Pennsylvania Department of Transportation (PennDOT). The first author would like to acknowledge the graduate fellowship program from Samsung Lee Kun Hee Scholarship Foundation in Seoul, Korea. The authors would like to thank Paul Majoris and James Johnson for granting access to the Buffalo Creek Bridge site. The authors also would like to thank Profs. David W. Greve and Irving J. Oppenheim for providing invaluable comments and making the scaled girder specimen available for our study
Strong Spin-Phonon Coupling Mediated by Single Ion Anisotropy in the All-In-All-Out Pyrochlore Magnet Cd2Os2 O7
No full textSpin-phonon coupling mediated by single ion anisotropy was investigated using optical spectroscopy and first-principles calculations in the all-in-all-out pyrochlore magnet Cd2Os2O7. Clear anomalies were observed in both the phonon frequencies and linewidths at the magnetic ordering temperature. The renormalization of the phonon modes was exceptionally large, signifying the presence of an unconventional magnetoelastic term from large spin-orbit coupling. In addition, the relative phonon frequency shifts show a strong correlation with the modulation of noncubic crystal field by the corresponding lattice distortion. Our observation establishes a new type of spin-phonon coupling through single ion anisotropy, a second-order spin-orbit coupling term, in Cd2Os2O7. © 2017 American Physical Society4
Electronic structure and insulating gap in epitaxial VO2 polymorphs
No full textDetermining the origin of the insulating gap in the monoclinic V O2(M1) is
a long-standing issue. The difficulty of this study arises from the simultaneous
occurrence of structural and electronic transitions upon thermal cycling. Here, we
compare the electronic structure of the M1 phase with that of single crystalline
insulating V O2(A) and V O2(B) thin films to better understand
the insulating phase of VO2. As these A and B phases do not undergo a
structural transition upon thermal cycling, we comparatively study the origin of the
gap opening in the insulating VO2 phases. By x-ray absorption and
optical spectroscopy, we find that the shift of unoccupied
t2g orbitals away from the Fermi level is a common
feature, which plays an important role for the insulating behavior in VO2
polymorphs.
The distinct splitting of the half-filled t2g orbital is
observed only in the M1 phase, widening the bandgap up to ∼0.6
eV. Our approach of comparing all three insulating VO2 phases provides
insight into a better understanding of the electronic structure and the origin of the
insulating gap in VO2
Abstract 2232: Dietary flavonoids, CYP1A1 genetic variants, and the risk of colorectal cancer
No full textAbstract
The role of dietary flavonoid intake in colorectal carcinogenesis might differ according to flavonoid subclasses and individual genetic variants related to carcinogen metabolism. Therefore, we examined whether greater habitual dietary intake of flavonoid subclasses was associated with a lower risk of colorectal cancer and whether CYP1A1 genetic variants altered this association. A semi-quantitative food frequency questionnaire was used to assess the dietary intake of six flavonoid subclasses (flavonols, flavonones, flavanones, flavan-3-ols, anthocyanidins, and isoflavones) in 923 patients with colorectal cancer and 1,846 controls; furthermore, CYP1A1 genetic variants (rs4646903 and rs1048943) were genotyped. A logistic regression was used to investigate dietary flavonoid intake, CYP1A1 genetic variants, and their interaction in relation to colorectal cancer risk. Among the subclasses of flavonoids, flavonols (OR [95% CI] = 0.10 [0.06, 0.16], highest vs. lowest quartile) and flavan-3-ols (OR [95% CI] = 0.54 [0.41, 0.71], highest vs. lowest quartile) were significantly associated with colorectal cancer risk after adjusting for confounders. Homozygous variants of CYP1A1 rs4646903 showed a protective effect on the risk of rectal cancer (OR [95% CI] = 0.60 [0.37, 0.96], CC vs. TT/TC). Carriers of the CC homozygous variant with high flavonol intake showed a greater decrease in colorectal cancer risk compared with T allele carriers with low flavonol intake (P for interaction = 0.02), particularly regarding rectal cancer (P for interaction = 0.005). In conclusion, the effect of dietary flavonoid intake on colorectal cancer risk differs by flavonoid subclasses and CYP1A1 genetic variants.
Citation Format: Jeongseon Kim, Young Ae Cho, Jeonghee Lee, Jae Hwan Oh, Dae Kyung Sohn, Hee Jin Chang. Dietary flavonoids, CYP1A1 genetic variants, and the risk of colorectal cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 2232. doi:10.1158/1538-7445.AM2017-2232</jats:p
The impact of orbital hybridization on the electronic structure of crystalline InGaZnO: a new perspective on the compositional dependence
No full textWe report an investigation of the electronic structure of crystalline InGaZnO (IGZO) using X-ray absorption spectroscopy (XAS) and ab initio density functional theory calculations. The electronic properties of the conduction band vary significantly with the composition of InGaZnO4 and In2Ga2ZnO7, and this is strongly correlated with the XAS spectra. Detailed analyses of the orbital character reveal crystal field splitting under characteristic local structural distortions of the ZnO5 coordinate bonds, which breaks the In p/d orbital degeneracy and preferentially lowers the energies of the In p(z) and d(3z(2) - r(2), xz/yz) orbitals near the Zn ions. The In s-p/d orbitals hybridize and contribute to the low-energy features of the In 5s orbitals. Therefore, the strong dependence of the electronic structure on the composition can be understood in terms of the abundance of distorted ZnO5 coordination near the In3+ ions. In the case of amorphous IGZO, however, the XAS study and the ab initio calculations consistently show that the dependence of the electronic structure on the composition is significantly weaker than it is for crystalline IGZO, which is due to the lack of distinct symmetry in the s-p/d mixed orbitals. This work demonstrates that orbital hybridization is significant in determining the detailed low-energy electronic structure of crystalline IGZO
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