9,130 research outputs found
Multivariable Scaling for the Anomalous Hall Effect
We derive a general scaling relation for the anomalous Hall effect in
ferromagnetic metals involving multiple competing scattering mechanisms,
described by a quadratic hypersurface in the space spanned by the partial
resistivities. We also present experimental findings, which show strong
deviation from previously found scaling forms when different scattering
mechanism compete in strength but can be nicely explained by our theory
Transmission resonance in a composite plasmonic structure
The design, fabrication, and optical properties of a composite plasmonic
structure, a two-dimentional array of split-ring resonators inserted into
periodic square holes of a metal film, have been reported. A new type of
transmission resonance, which makes a significant difference from the
conventional peaks, has been suggested both theoretically and experimentally.
To understand this effect, a mechanism of ring- resonance induced dipole
emission is proposed.Comment: 14 pages, 4 figure
Understanding the Double-Level Influence of Guanxi on Construction Innovation in China: The Mediating Role of Interpersonal Knowledge Sharing and the Cross-Level Moderating Role of Inter-Organizational Relationships
Guanxi, a Chinese term that defines social networks of power and benefits, can be divided into inter-personal and inter-organizational relationships. Guanxi significantly influences construction innovation in China. Many studies have examined the relationship between guanxi and construction innovation at the project or organizational level. However, few of these studies explain how guanxi might affect an individual’s innovative behaviour from a double-level perspective. This paper builds on social capital theory and social exchange theory to examine guanxi’s role in motivating innovative behaviour in a China-specific construction context. It investigates the main effects of inter-personal relationships on innovative behaviour, the mediating effects of knowledge sharing, and the cross-level moderating effects of inter-organizational relationships. These elements were tested using a survey that received 178 responses from 35 different organizations. The results were analysed using Hierarchical Linear Modelling (HLM) and revealed that inter-personal relationships have positive influences on innovative behaviour, thus highlighting the partial mediating effects of knowledge sharing. In addition, the analyses showed that inter-organizational relationships augment inter-personal relationships and knowledge sharing on innovative behaviour by cross-level interaction. The research findings enhance an understanding of guanxi and innovative behaviour in China-specific construction project settings, as well as verifying the significance of guanxi in stimulating innovative behaviour
Dual effect of surface plasmons in light transmission through perforated metal films
The light transmission through square and rectangular holes in a metal film
has been studied. By taking account of plasma response of real metal on hole
walls as well as metal surface, an analytical result for the transmission has
been deduced, which agrees well with the experiments. We show that the light
transmission involves both the diffraction modes and the surface plasmons.
Strong coupling of diffraction modes to surface plasmon polariton results in
the transmission minima, whereas the coupling to cavity surface plasmon leads
to the transmission maxima. The results suggest a dual-effect of the surface
plasmons.Comment: 22 pages, 6 figure
Endoglin Is Essential for the Maintenance of Self-Renewal and Chemoresistance in Renal Cancer Stem Cells.
Renal cell carcinoma (RCC) is a deadly malignancy due to its tendency to metastasize and resistance to chemotherapy. Stem-like tumor cells often confer these aggressive behaviors. We discovered an endoglin (CD105)-expressing subpopulation in human RCC xenografts and patient samples with a greater capability to form spheres in vitro and tumors in mice at low dilutions than parental cells. Knockdown of CD105 by short hairpin RNA and CRISPR/cas9 reduced stemness markers and sphere-formation ability while accelerating senescence in vitro. Importantly, downregulation of CD105 significantly decreased the tumorigenicity and gemcitabine resistance. This loss of stem-like properties can be rescued by CDA, MYC, or NANOG, and CDA might act as a demethylase maintaining MYC and NANOG. In this study, we showed that Endoglin (CD105) expression not only demarcates a cancer stem cell subpopulation but also confers self-renewal ability and contributes to chemoresistance in RCC
First photometric study of the eclipsing binary PS Persei
The CCD photometric observations of the eclipsing binary PS Persei (PS Per)
were obtained on two consecutive days in 2009. The 2003 version Wilson-Devinney
code was used to analyze the first complete light curves in and bands.
It is found that PS Per is a short-period Algol-type binary with the less
massive component accurately filling its inner critical Roche lobe. The mass
ratio of and the orbital inclination of are
obtained. On the other hand, based on all available times of primary light
minimum including two new ones, the orbital period has been improved.Comment: 7 pages, 4 figure
Determination of antidepressant activity of Cyperus rotundus L extract in rats
Purpose: To investigate the antidepressant effect of Cyperus rotundus L. extract (CRLE) in rats.Methods: A rat model of depression was prepared for behavioral tests including tail suspension test or forced swimming test. Wistar rats were randomly divided into six groups (n = 10): normal group (0.9 % NaCl), model group (0.9 % NaCl), positive drug group (fluoxetine 30 mg/kg) as well as CRLE groups, namely, 200, 400 and 800 mg/kg doses. All drugs were orally administered at 14: 00 - 15: 00 h for 1, 7 and 14 days, respectively. Tail suspension and forced swimming tests were conducted 1 h after the last treatment. Monoamine oxidize A (MAO) assay was commenced in rats after 14-day administration. Except for the rats in normal group, other group participated in the behavioral tests.Results: The effect of 800 mg/kg CRLE was more potent than the positive drug fluoxetine. CRLE (≥ 200 mg/kg) treatment for 14 days significantly inhibited brain MAO activity in rats (p < 0.01) in a dosedependent manner. Oral administration of 800 mg/kg CRLE produced MAO B inhibitory activity in rat brain (p < 0.01). Fluoxetine inhibited both brain MAO A and B activities in rats (p < 0.01).Conclusion: The results suggest that CRLE produces significant antidepressant effect in rats, and therefore, may be useful for the treatment of depressed patients, but further studies are required to ascertain this.Keywords: Cyperus rotundus, Antidepressant, Tail suspension test, Forced swimming test, Monoamine oxidase, Fluoxetin
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