1,853 research outputs found
Classification of Equivariant Complex Vector Bundles over a Circle
In this paper we characterize the fiber representations of equivariant
complex vector bundles over a circle and classify these bundles. We also treat
the triviality of equivariant complex vector bundles over a circle by
investigating the extensions of representations. As a corollary of our results,
we calculate the reduced equivariant K-group of a circle for any compact Lie
group.Comment: 15 pages, AMS-LaTeX v1.
Classification of equivariant real vector bundles over a circle
This is a continuation of the authors' previous work [math.AT/9910001] on
classification of equivariant complex vector bundles over a circle. In this
paper we classify equivariant real vector bundles over a circle with a compact
Lie group action, by characterizing the fiber representations of them, and by
using the result of the complex case. We also treat the triviality of them. The
basic phenomenon is similar to the complex case but more complicated here.Comment: 16 pages, AMS-LaTeX v1.
Monitoring of multi-frequency polarization of gamma-ray bright AGNs
We started two observing programs with the Korean VLBI Network (KVN)
monitoring changes in the flux density and polarization of relativistic jets in
gamma-ray bright AGNs simultaneously at 22, 43, 86, 129 GHz. One is a
single-dish weekly-observing program in dual polarization with KVN 21-m
diameter radio telescopes beginning in 2011 May. The other is a VLBI
monthly-observing program with the three-element VLBI network at an angular
resolution range of 1.0--9.2 mas beginning in 2012 December. The monitoring
observations aim to study correlation of variability in gamma-ray with that in
radio flux density and polarization of relativistic jets when they flare up.
These observations enable us to study the origin of the gamma-ray flares of
AGNs.Comment: 4 pages, 4 figures, Proceedings of the conference "The innermost
regions of relativistic jets and their magnetic fields", Granada, Spai
Dietary Intake and Serum Levels of Iron in Relation to Oxidative Stress in Breast Cancer Patients
Iron may induce oxidative stress via production of reactive oxygen species, facilitating mammary carcinogenesis. This study investigated the role of iron in relation to oxidative stress as a potential risk factor in the development of breast cancer (BC). BC patients (n = 121) and healthy age-matched controls (n = 149) were entered into the study. Iron and antioxidant vitamins intakes were estimated using a quantitative food frequency questionnaire. Thirty one subjects from each group provided blood samples for measurement of serum iron, plasma malondialdehyde (MDA) and ferric reducing ability of plasma (FRAP). Total and non-heme iron intake of BC patients were lower than those of the controls. However, the serum iron level was significantly higher in BC patients. Plasma MDA levels were also significantly higher in BC patients whereas no significant difference in FRAP values were observed between the two groups. Log-transformed serum iron concentration showed no significant correlation with MDA or FRAP. These results suggest that serum iron overload may be a breast cancer risk factor possibly due to increased oxidative stress
Corporate Social Responsibility of the Media: Instrument Development and Validation
With the emergence of significant problems in capitalist systems around the world, corporate social responsibility has taken on greater emphasis. In the media industry, in which public interest has been discussed for a long time, the importance of corporate social responsibility is magnified again. Although many studies have already addressed this topic, there is less literature on how to measure corporate social responsibility in the media industry. This study aims to develop an instrument to measure corporate social responsibility in the media industry. Using data from 253 experts who majored in communication, this study verifies a proposed instrument. Results show that corporate social responsibility in the media consists of three major constructs, namely reliability, usefulness, and fairness. The findings of this study are expected to enable practitioners to improve social responsibility in their media and to allow academics to make further headway in this research stream
Plasma cell granuloma in cyclosporine-induced gingival overgrowth: a report of two cases with immunohistochemical positivity of interleukin-6 and phospholipase C-gamma1.
We report two cases of gingival plasma cell granuloma in a 34-yr-old and 40-yr-old two male renal transplant recipients with cyclosporine A (CsA)-induced gingival overgrowth (GO). Histologically, these lesions were composed of mature plasma cells, showing polyclonality for both lambda and kappa light chains and fibrovascular connective tissue stroma. In addition to the fact that CsA-induced plasma cell granuloma is rare, the salient features of our cases were the secretion of interleukin-6 and overexpression of phospholipase C- gamma 1 of the tumor cells, which may explain the mechanisms of CsA- induced GO
Two-gap and paramagnetic pair-breaking effects on upper critical field of SmFeAsO and SmFeAsOF single crystals
We investigated the temperature dependence of the upper critical field
[] of fluorine-free SmFeAsO and fluorine-doped
SmFeAsOF single crystals by measuring the resistive transition
in low static magnetic fields and in pulsed fields up to 60 T. Both crystals
show that 's along the c axis [] and in an -planar
direction [] exhibit a linear and a sublinear increase,
respectively, with decreasing temperature below the superconducting transition.
's in both directions deviate from the conventional one-gap
Werthamer-Helfand-Hohenberg theoretical prediction at low temperatures. A
two-gap nature and the paramagnetic pair-breaking effect are shown to be
responsible for the temperature-dependent behavior of and
, respectively.Comment: 21 pages, 8 figure
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