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RISS 인기검색어
- 검색키워드
- 저자 : Kolesov, Egor A. (검색결과 3 건)
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Phonon anharmonicities in supported graphene
Kolesov, Egor A.,Tivanov, Mikhail S.,Korolik, Olga V.,Kapitanova, Olesya O.,Cho, Hak Dong,Kang, Tae Won,Panin, Gennady N. Elsevier 2019 Carbon Vol.141 No.-
<P><B>Abstract</B></P> <P>The paper presents temperature-dependent Raman studies of anharmonic phonon properties of graphene as-grown on copper, transferred to copper, SiO<SUB>2</SUB>/Si, and Al<SUB>2</SUB>O<SUB>3</SUB>, as well as nitrogen-doped graphene on SiO<SUB>2</SUB>/Si. Different G and 2D peak position and linewidth temperature dependencies were obtained in the temperature range of 20–294 K, upon which anharmonic constants for 3- and 4-phonon processes were determined. Values of anharmonic constants obtained from G peak shift for undoped graphene on dielectric substrates were quantitatively close to both experimental results for unsupported graphene and theoretical predictions reported in the literature, while the values for graphene as-grown on copper were almost two orders of magnitude greater. The results were analyzed in terms of substrate effect on phonon properties of graphene. The present study is useful for taking into account anharmonic phonon effects in graphene when designing graphene-based nanoelectronic devices.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Oksana Kolesova,Aleksandrs Kolesovs,Janis Vetra 대한해부학회 2017 Anatomy & Cell Biology Vol.50 No.4
The pelvis and the spine form a system balancing human skeleton. Within this system, the pelvis adapts to age-related changes in the spine. Previous studies were predominantly focused on changes of pelvic parameters in the sagittal plane. The aim of this study was to reveal age-related changes of lesser pelvic dimensions at different levels of the pelvic cavity in the sagittal and coronal planes and to explore sexual dimorphism in age-related tendencies. The computed tomography pelvimetry was performed on the three-dimensional workstation. The research sample included 211 females aged 18 to 84 years and 181 males aged 18 to 82 years, who underwent an examination at the Riga East University Hospital, Clinical Center “Gailezers,” Latvia. Three pelvic angles and transverse and sagittal diameters of the lesser pelvis were measured at four levels: the inlet, two axial planes in the mid-cavity, and the outlet. The results demonstrated that more pronounced age-related changes occurred in the inlet and the outlet of the lesser pelvis. The mid-cavity was less changing. The transverse diameter between acetabular centers and the sagittal diameter at the level of ischial spines were independent of age. In general, the common age-related trends were observed for pelvic parameters in females and males. A single exception was the proportion of diameters at the level of ischial spines, which decreased in males only. For parameters associated with pelvic floor diseases, age-related changes occurred in the direction of pathology.
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