1,020 research outputs found
Study on Smoke Control of Wuhan CBD Urban Traffic Link Tunnel
AbstractAn Urban Traffic Link Tunnel (UTLT) is a novel type of underground transportation system consisting of a main tunnel in a loop shape and several linked tunnels. It has a higher level of fire risk compared to other common road tunnels. In this study, numerical and experimental study has been conducted to investigate the smoke control of Wuhan Central Business District (CBD) UTLT. The transient distributions of the smoke spread have been analyzed, and the optimal smoke control strategy for the Wuhan CBD UTLT has been put forward
Optimization of network structure to random failures
Network's resilience to the malfunction of its components has been of great
concern. The goal of this work is to determine the network design guidelines,
which maximizes the network efficiency while keeping the cost of the network
(that is the average connectivity) constant. With a global optimization method,
memory tabu search (MTS), we get the optimal network structure with the
approximately best efficiency. We analyze the statistical characters of the
network and find that a network with a small quantity of hub nodes, high degree
of clustering may be much more resilient to perturbations than a random network
and the optimal network is one kind of highly heterogeneous networks. The
results strongly suggest that networks with higher efficiency are more robust
to random failures. In addition, we propose a simple model to describe the
statistical properties of the optimal network and investigate the
synchronizability of this model.Comment: 11 pages, 6 figures, accepted by Physica
Expression of COX-2 and Bcl-2 in primary fallopian tube carcinoma: correlations with clinicopathologic features
The aim of this study was to evaluate the expression of COX-2 and Bcl-2 in primary fallopian tube
carcinoma (PFTC), as well as their correlations with clinicopathologic features. We studied a cohort of 33 patients
with a pathological diagnosis of PFTC. Thirty normal tubal tissues used for controls were obtained from
patients diagnosed with uterine myomas. Expression analysis for COX-2 and Bcl-2 was performed using the
immunohistochemical technique. The rate of preoperative diagnosis was 18.2%. With a median survival of 61.0
months (95% CI: 43.2 to 78.8 months), the estimated five-year overall survival rate in the 33 patients was 39.0%.
Increased expression of COX-2 and Bcl-2 was observed in tumor specimens compared to normal controls
(p = 0.026; p = 0.003). The expression rate of COX-2 in node-positive tumors was significantly higher than that
of node-negative tumors (p = 0.024). Moreover, the expression rate of COX-2 was statistically significantly
higher in patients with infiltration through the serosa (p = 0.019). Positive significant associations were observed
between Bcl-2 staining index and FIGO stage (p = 0.015), and between Bcl-2 staining and lymph node
metastasis (p = 0.010). There was a significant correlation between COX-2 expression and Bcl-2 staining index
(r = 0.517, p = 0.002). We conclude that COX-2 and Bcl-2 may potentially be useful prognostic markers for
PFTC. The exact molecular mechanism for correlations between COX-2 and Bcl-2 remains to be elucidated.
(Folia Histochemica et Cytobiologica 2011, Vol. 49, No. 3, 389–397
Generation of photons with extremely large orbital angular momenta
Vortex photons, which carry large intrinsic orbital angular momenta
(OAM), have significant applications in nuclear, atomic, hadron, particle and
astro-physics, but their production remains unclear. In this work, we
investigate the generation of such photons from nonlinear Compton scattering of
circularly polarized monochromatic lasers on vortex electrons. We develop a
quantum radiation theory for ultrarelativistic vortex electrons in lasers by
using the harmonics expansion and spin eigenfunctions, which allows us to
explore the kinematical characteristics, angular momentum transfer mechanisms,
and formation conditions of vortex photons. The multiphoton absorption
of electrons enables the vortex photons, with fixed polarizations and
energies, to exist in mixed states comprised of multiple harmonics. Each
harmonic represents a vortex eigenmode and has transverse momentum broadening
due to transverse momenta of the vortex electrons. The large topological
charges associated with vortex electrons offer the possibility for
photons to carry adjustable OAM quantum numbers from tens to thousands of
units, even at moderate laser intensities. photons with large OAM and
transverse coherence length can assist in influencing quantum selection rules
and extracting phase of the scattering amplitude in scattering processes.Comment: 7 pages, 4 figure
Vaccinium usneoides (Ericaceae), a new species from Yunnan, China
Vaccinium usneoides (Ericaceae), a new species from Fugong County of Yunnan Province, China is described and illustrated. This new species belongs to Vaccinium sect. Calcicolus and is most similar to V. brachyandrum, but differs in its branches hanging down, much smaller leaf blades, shorter inflorescences and pedicels, non-glandular tomentellate or densely pubescent inflorescence rachis and pedicels, densely white-pubescent hypanthium and pilose filaments
A simulation study on the measurement of D0-D0bar mixing parameter y at BES-III
We established a method on measuring the \dzdzb mixing parameter for
BESIII experiment at the BEPCII collider. In this method, the doubly
tagged events, with one decays to
CP-eigenstates and the other decays semileptonically, are used to
reconstruct the signals. Since this analysis requires good separation,
a likelihood approach, which combines the , time of flight and the
electromagnetic shower detectors information, is used for particle
identification. We estimate the sensitivity of the measurement of to be
0.007 based on a fully simulated MC sample.Comment: 6 pages, 7 figure
Antrodia camphorata Mycelia Exert Anti-liver Cancer Effects and Inhibit STAT3 Signaling in vitro and in vivo
Hepatocellular carcinoma (HCC), the major form of primary liver cancer, is a common cause of cancer-related death worldwide. Signal transducer and activator of transcription 3 (STAT3) signaling is constantly activated in HCC and has been proposed as a chemotherapeutic target for HCC. Antrodia camphorata (AC), a medicinal mushroom unique to Taiwan, is traditionally used for treating HCC. Whereas natural AC is scarce, cultured AC mycelia are becoming alternatives. In this study, we investigated the anti-HCC effects of the ethyl acetate fraction of an ethanolic extract of AC mycelia (EEAC), particularly exploring the involvement of STAT3 signaling in these effects. We found that EEAC reduced cell viability, induced apoptosis, and retarded migration and invasion in cultured HepG2 and SMMC-7721 cells. Immunoblotting results showed that EEAC downregulated protein levels of phosphorylated and total STAT3 and JAK2 (an upstream kinase of STAT3) in HCC cells. Real-time PCR analyses showed that STAT3, but not JAK2, mRNA levels were decreased by EEAC. EEAC also lowered the protein level of nuclear STAT3, decreased the transcriptional activity of STAT3, and downregulated protein levels of STAT3-targeted molecules, including anti-apoptotic proteins Bcl-xL and Bcl-2, and invasion-related proteins MMP-2 and MMP-9. Over-activation of STAT3 in HCC cells diminished the cytotoxic effects of EEAC. In SMMC-7721 cell-bearing mice, EEAC (100 mg/kg, i.g. for 18 days) significantly inhibited tumor growth. Consistent with our in vitro data, EEAC induced apoptosis and suppressed JAK2/STAT3 activation/phosphorylation in the tumors. Taken together, EEAC exerts anti-HCC effects both in vitro and in vivo; and inhibition of STAT3 signaling is, at least in part, responsible for these effects. We did not observe significant toxicity of EEAC in normal human liver-derived cells, nude mice and rats. Our results provide a pharmacological basis for developing EEAC as a safe and effective agent for HCC management
An Updated Search of Steady TeV Ray Point Sources in Northern Hemisphere Using the Tibet Air Shower Array
Using the data taken from Tibet II High Density (HD) Array (1997
February-1999 September) and Tibet-III array (1999 November-2005 November), our
previous northern sky survey for TeV ray point sources has now been
updated by a factor of 2.8 improved statistics. From to
in declination (Dec) range, no new TeV ray point
sources with sufficiently high significance were identified while the
well-known Crab Nebula and Mrk421 remain to be the brightest TeV ray
sources within the field of view of the Tibet air shower array. Based on the
currently available data and at the 90% confidence level (C.L.), the flux upper
limits for different power law index assumption are re-derived, which are
approximately improved by 1.7 times as compared with our previous reported
limits.Comment: This paper has been accepted by hepn
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