3,184 research outputs found
The Photometric Investigation of V921 Her using the Lunar-based Ultraviolet Telescope of Chang'e-3 mission
The light curve of V921 Her in ultraviolet band observed by the Lunar-based
Ultraviolet Telescope (LUT) is analyzed by the Wilson-Devinney code. Our
solutions conclude that V921 Her is an early type marginal contact binary
system with an additional close-in component. The binary system is under poor
thermal contact with a temperature difference of nearly between the two
components. The close-in component contributes about of the total
luminosity in the triple system. Combining the radial velocity study together
with our photometric solutions, the mass of the primary star and secondary one
are calculated to be , . The evolutionary scenario of V921 Her is discussed.
All times of light minimum of V921 Her available in the bibliography are taken
into account and the curve is analyzed for the first time. The most
probable fitting results are discussed in the paper, which also confirm the
existence of a third component ( year) around the binary system. The
period of V921 Her is also undergoing a continuously rapid increase at a rate
of , which may due to mass
transfer from the less massive component to the more massive one
New definition of potential spicity by the least square method
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 7351-7365, doi:10.1029/2018JC014306.A differentiable function whose contours are orthogonal to potential density (σ) contours does not exist. However, such a function, called potential spicity (π), can be defined in the least square sense; these two functions form a practically orthogonal coordinate system in potential temperature‐salinity (θ‐S) space. Thus, in addition to the classical potential temperature‐salinity (θ‐S) diagram, seawater properties can be studied in the potential density‐potential spicity (σ − π) diagram.Guangzhou Science and Technology Program key projects. Grant Number: 201804020056
National Natural Science Foundation of China. Grant Numbers: 41476167, 91752108
National Natural Science Foundation of Guangdong Province, China Grant Number: 2016A030311042;
Strategic Priority Research Program of the Chinese Academy of Sciences Grant Number: XDA11030302;
Guangzhou Science and Technology Program;
NSF of Guangdong Province, China2019-04-1
Successful radiofrequency ablation of a right posteroseptal accessory pathway through an anomalous inferior vena cava and azygos continuation in a patient with incomplete situs inversus
We present a 43-year-old patient with paroxysmal supraventricular tachycardia. In the process
of catheter ablation, we found interruption of the inferior vena cava with azygos continuation
with incomplete situs inversus. In this patient, we adopted the lower approach via the anomalous
inferior vena cava and azygos continuation to achieve stability of radiofrequency catheter
for right posteroseptal accessory pathway, and successfully abolished the preexcitation
Regularized Shallow Image Prior for Electrical Impedance Tomography
Untrained Neural Network Prior (UNNP) based algorithms have gained increasing
popularity in tomographic imaging, as they offer superior performance compared
to hand-crafted priors and do not require training. UNNP-based methods usually
rely on deep architectures which are known for their excellent feature
extraction ability compared to shallow ones. Contrary to common UNNP-based
approaches, we propose a regularized shallow image prior method that combines
UNNP with hand-crafted prior for Electrical Impedance Tomography (EIT). Our
approach employs a 3-layer Multi-Layer Perceptron (MLP) as the UNNP in
regularizing 2D and 3D EIT inversion. We demonstrate the influence of two
typical hand-crafted regularizations when representing the conductivity
distribution with shallow MLPs. We show considerably improved EIT image quality
compared to conventional regularization algorithms, especially in structure
preservation. The results suggest that combining the shallow image prior and
the hand-crafted regularization can achieve similar performance to the Deep
Image Prior (DIP) but with less architectural dependency and complexity of the
neural network
Significance of the lipid profile and endothelium-dependent vasodilatation in the pathogenesis of microvascular angina
Background: To investigate the significance of lipid disorders and endothelial dysfunction in
the pathogenesis of microvascular angina.
Methods: Levels of plasma lipids, lipoproteins and apolipoproteins were assessed in 21 patients
with microvascular angina and 24 healthy subjects as controls. Also, the endothelium-dependent
vasodilatation function was determined with high-resolution ultrasound in both groups.
Results: Levels of serum total cholesterol (TC), low density lipoprotein-cholesterol (LDL-C),
apolipoprotein B100 (ApoB100) and lipoprotein(a) [Lp(a)] in microvascular angina group
were significantly higher than those in healthy subjects (each p < 0.05). The flow-mediated
dilatation (FMD) in brachial arteries in patients with microvascular angina declined significantly
as compared with that in control subjects (4.7 ± 1.9% vs. 12.8 ± 3.7%, p < 0.001).
However, no significant difference was observed in response to nitroglycerin between groups
(19.7 ± 8.1% vs. 21.2 ± 6.6%; p > 0.05). Linear correlation analysis revealed a significant
negative correlation between the FMD of brachial arteries and the serum levels of LDL-C and
Lp(a) in the microvascular angina group (r = -0.5125 and -0.4271, respectively, both p < 0.001). Subsequently, all subjects were pooled and divided into two groups (groups A and B)
according to the degree of FMD in brachial arteries (A £ 4% and B > 4%). The serum LDL-C
level was found to be significantly higher in group A than in group B (4.09 ± 0.65 mmol/L vs.
2.59 ± 0.49 mmol/L; p < 0.05).
Conclusions: Plasma lipid disorders and vascular endothelial dysfunction may play important
roles in the development of microvascular angina. The dysfunction of endothelium-dependent vasodilation was mainly associated with anomalies in LDL-C and Lp(a), and
myocardial endothelial dysfunction was aggravated by lipid abnormalities in patients with
microvascular angina
Menin prevents liver steatosis through co-activation of peroxisome proliferator-activated receptor alpha
AbstractFatty liver is strongly associated with metabolic syndrome. Here, we show that the impaired hepatic expression of menin, the product of the MEN1 (multiple endocrine neoplasia type 1) tumor suppressor gene, represents a common feature of several fatty liver mouse models. The liver specific ablation of MEN1 gene expression in healthy mice induced hepatic steatosis under high-fat dietary conditions. Moreover, overexpression of menin in livers of steatotic db/db mice reduced liver triglyceride accumulation. At the molecular level, we found that menin acts synergistically with the nuclear receptor PPARα to control gene expression of fatty acid oxidation. Collectively, these data suggest a crucial role for menin as an integrator of the complex transcriptional network controlling hepatic steatosis.Structured summary of protein interactionsMenin physically interacts with PPAR alpha by anti tag coimmunoprecipitation (View Interaction: 1, 2)
Experimental research on evolving rules of segregation ice in artificial frozen soil
AbstractThe foundation of frost heave controlling is the research on evolving rules of segregation ice. The evolving rules of segregation ice have been researched systematically by one-dimension freezing experiments. The technique of dynamic photograph has been applied in research for the first time. The research on segregation ice indicated that three phases can be divided according to the change of temperature field: few segregation ices appeared in the first phases, several thin and discontinuous segregation ices appeared in the second phases, segregation ice evolvement was mainly the growth of final ice lens in the third phase when the freezing front tended to be stable
Origin of the Temperature Oscillation in Turbulent Thermal Convection
We report an experimental study of the three-dimensional spatial structure of
the low frequency temperature oscillations in a cylindrical Rayleigh-B\'{e}nard
convection cell. It is found that thermal plumes are not emitted periodically,
but randomly and continuously, from the top and bottom plates. We further found
that the oscillation of the temperature field does not originate from the
boundary layers, but rather is a result of the horizontal motion of the hot
ascending and cold descending fluids being modulated by the twisting and
sloshing motion of the bulk flow field.Comment: 5 figure
- …