2,837 research outputs found
3-[1-(4-ChloroÂphenÂyl)ethÂyl]-1,3-thiaÂzinane-2-thione
In the title compound, C12H14ClNS2, the thiaÂzole ring adopts an envelope conformation; the basal plane is nearly perpendicular to the benzene ring at a dihedral angle of 85.72 (5)°. Weak interÂmolecular C—H⋯S hydrogen bonding is present in the crystal structure
Ghost imaging lidar via sparsity constraints
For remote sensing, high-resolution imaging techniques are helpful to catch
more characteristic information of the target. We extend pseudo-thermal light
ghost imaging to the area of remote imaging and propose a ghost imaging lidar
system. For the first time, we demonstrate experimentally that the real-space
image of a target at about 1.0 km range with 20 mm resolution is achieved by
ghost imaging via sparsity constraints (GISC) technique. The characters of GISC
technique compared to the existing lidar systems are also discussed.Comment: 4pages, 3figure
Ghost imaging without beam splitter
Many significant results have been achieved in the fields of ghost imaging,
in which the beam splitter is an indispensable optical component. This paper
introduces a method to realize ghost imaging without beam splitter. And we
study this method experimentally and theoretically. Finally, we suggest that
our device can be applied to implement the ghost imaging when we use the Sun
light as the light source
as a molecule from the pole counting rule
A comprehensive study on the nature of the resonant structure is
carried out in this work. By constructing the pertinent effective Lagrangians
and considering the important final-state-interaction effects, we first give a
unified description to all the relevant experimental data available, including
the and invariant mass distributions from the process, the distribution from and
also the spectrum in the process.
After fitting the unknown parameters to the previous data, we search the pole
in the complex energy plane and find only one pole in the nearby energy region
in different Riemann sheets. Therefore we conclude that is of
molecular nature, according to the pole counting rule
method~[Nucl.~Phys.~A543, 632 (1992); Phys.~Rev.~D 35,~1633 (1987)]. We
emphasize that the conclusion based upon the pole counting method is not
trivial, since both the contact interactions and the explicit
exchanges are introduced in our analyses and they lead to the same
conclusion.Comment: 21 pages, 9 figures. To match the published version in PRD.
Additional discussion on the spectral density function is include
An Improved Electrical Switching and Phase-Transition Model for Scanning Probe Phase-Change Memory
Scanning probe phase-change memory (SPPCM) has been widely considered as one of the most promising candidates for next-generation data storage devices due to its fast switching time, low power consumption, and potential for ultra-high density. Development of a comprehensive model able to accurately describe all the physical processes involved in SPPCM operations is therefore vital to provide researchers with an effective route for device optimization. In this paper, we introduce a pseudo-three-dimensional model to simulate the electrothermal and phase-transition phenomena observed during the SPPCM writing process by simultaneously solving Laplace’s equation to model the electrical process, the classical heat transfer equation, and a rate equation to model phase transitions. The crystalline bit region of a typical probe system and the resulting current-voltage curve obtained from simulations of the writing process showed good agreement with experimental results obtained under an equivalent configuration, demonstrating the validity of the proposed model
Adaptive Ensemble of Classifiers with Regularization for Imbalanced Data Classification
The dynamic ensemble selection of classifiers is an effective approach for
processing label-imbalanced data classifications. However, such a technique is
prone to overfitting, owing to the lack of regularization methods and the
dependence of the aforementioned technique on local geometry. In this study,
focusing on binary imbalanced data classification, a novel dynamic ensemble
method, namely adaptive ensemble of classifiers with regularization (AER), is
proposed, to overcome the stated limitations. The method solves the overfitting
problem through implicit regularization. Specifically, it leverages the
properties of stochastic gradient descent to obtain the solution with the
minimum norm, thereby achieving regularization; furthermore, it interpolates
the ensemble weights by exploiting the global geometry of data to further
prevent overfitting. According to our theoretical proofs, the seemingly
complicated AER paradigm, in addition to its regularization capabilities, can
actually reduce the asymptotic time and memory complexities of several other
algorithms. We evaluate the proposed AER method on seven benchmark imbalanced
datasets from the UCI machine learning repository and one artificially
generated GMM-based dataset with five variations. The results show that the
proposed algorithm outperforms the major existing algorithms based on multiple
metrics in most cases, and two hypothesis tests (McNemar's and Wilcoxon tests)
verify the statistical significance further. In addition, the proposed method
has other preferred properties such as special advantages in dealing with
highly imbalanced data, and it pioneers the research on the regularization for
dynamic ensemble methods.Comment: Major revision; Change of authors due to contribution
Evaluation of high mobility group box 1 protein as a presurgical diagnostic marker reflecting the severity of acute appendicitis.
RIGHTS : This article is licensed under the BioMed Central licence at http://www.biomedcentral.com/about/license which is similar to the 'Creative Commons Attribution Licence'. In brief you may : copy, distribute, and display the work; make derivative works; or make commercial use of the work - under the following conditions: the original author must be given credit; for any reuse or distribution, it must be made clear to others what the license terms of this work are.OBJECTIVES: To validate the role of high mobility group box-1(HMGB1) in diagnosis of acute appendicitis (AA) with different pathological severity. METHODS: According to the pathologically diagnosis, 150 patients underwent appendectomies between Jan. 2007 and Dec, 2010 were divided into acute simple, acute suppurative and acute gangrenous appendicitis as group 1, 2 and 3, respectively. Each patient group contains 50 sex and age matched cases to make comparison with 50 healthy volunteers. The mRNA and protein expression levels of serum HMGB1 were determined by real-time quantitative PCR and enzyme linked immunosorbent assay (ELISA). Serum High-sensitivity C-reactive protein (hs-CRP) levels were determined by rate nephelometric immunoassay. RESULTS: In comparison with health volunteers, relative HMGB1 mRNA levels in group 1, 2 and 3 were significantly increased 3.05 ± 0.51,8.33 ± 0.75 and 13.74 ± 1.09 folds, reflecting a tendency of augmented severity. In accordance, serum protein levels of HMGB1 were 10.97 ± 1.64, 14.42 ± 1.56 and 18.08 ± 2.41 ng/ml in 3 patient groups, which are significantly higher than that of healthy volunteers' 5.47 ± 0.73 ng/ml. hs-CRP levels were 12.85 ± 3.41, 21.04 ± 1.98 and 31.07 ± 5.46 ng/ml in 3 patients groups compared with 2.06 ± 0.77 ng/ml in controls. The concentrations of HMGB1 and hs-CRP were both positively correlated with disease severity. CONCLUSION: Serum HMGB1 constitutes as a valuable marker in diagnosis of AA. Positively correlated with hs-CRP level, mRNA and protein expression of HMGB1 to a certain extent reflected the severity of AA
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