Proximity and anomalous field-effect characteristics in double-wall carbon nanotubes

Proximity effect on field-effect characteristic (FEC) in double-wall carbon nanotubes (DWCNTs) is investigated. In a semiconductor-metal (S-M) DWCNT, the penetration of electron wavefunctions in the metallic shell to the semiconducting shell turns the original semiconducting tube into a metal with a non-zero local density of states at the Fermi level. By using a two-band tight-binding model on a ladder of two legs, it is demonstrated that anomalous FEC observed in so-called S-M type DWCNTs can be fully understood by the proximity effect of metallic phases.Comment: 4 pages, 4 figure

Seismic performance analysis of blast furnace shell structure

In this paper, the finite element software ANSYS is used to establish a three-dimensional space model of the blast furnace shell, and the static analysis of the space steel structure system of the blast furnace is carried out. The seismic response of the outer shell system of the blast furnace is analyzed by response spectrum method and linear time history analysis method, so as to explore the seismic response of the blast furnace shell

Seismic performance analysis of blast furnace shell structure

In this paper, the finite element software ANSYS is used to establish a three-dimensional space model of the blast furnace shell, and the static analysis of the space steel structure system of the blast furnace is carried out. The seismic response of the outer shell system of the blast furnace is analyzed by response spectrum method and linear time history analysis method, so as to explore the seismic response of the blast furnace shell

Overexpression of hypoxia-inducible factor prolylhydoxylase attenuated by HCG-induced vascular endothelial growth factor expression in luteal cells

Vascular endothelial growth factor (VEGF)-dependent angiogenesis plays a crucial role in the corpus leteum formation and their functional maintenances in mammalian ovaries. We recently reported that the activation of hypoxia-inducible factor (HIF)-1α signaling contributes to the regulation of VEGF expression in the luteal cells (LCs) in response to hypoxia and human chorionic gonadotropin (HCG). This study was designed to test the hypothesis that, HIF prolyl-dydoxylases (PHDs) express in LCs and overexpression of PHD attenuates the expression of VEGF induced by HCG in LCs. By real-time PCR and western blot analysis, we examined the expression of PHDs, confirmed the plasmid transfection and their expression and also investigated the changes of HIF-1α and VEGF expression after treatment with HCG and PHD2 transgenes. PHD2 expression was significantly higher than the others, indicating its main roles. Moreover, a significant increase of VEGF mRNA was found after HCG treatment, while this increased VEGF mRNA was also blocked by PHD2 overexpression in LCs. Further analysis also found that, this HCG-induced increase of VEGF mRNA was consistent with the level of HIF-1α protein, which is regulated by HIF prolyl-dydoxylase -mediated degradation. Taken together, our results indicated that, PHD2 mainly expressed in LCs and HCG-induced VEGF expression can be blocked by PHD2 overexpression through HIF-1α -mediated mechanism in LCs. This PHD2-mediated transcriptional activation may be one of the important mechanisms regulating VEGF expression in LCs during mammalian corpus leteum development.Key words: Hypoxia-inducible factor-1α, HIF prolyl-dydoxylase, vascular endothelial growth factor, human chorionic gonadotropin, luteal cells

Some integral inequalities on time scales

In this paper, some new integral inequalities on time scales are presented by using elementarily analytic methods in calculus of time scales.Comment: 8 page