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Search Results: 1 - 10 of 23339 matches for " Xuehua He "
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cis-Diaquabis(2,2′,2′′-tripyridylamine)zinc(II) bis(perchlorate)
Shi Wang,Xuehua Ding,Wenrui He,Wei Huang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809042688
Abstract: In the title compound, [Zn(2,2′,2′′-tpa)2(H2O)2](ClO4)2 (2,2′,2′′-tpa is 2,2′,2′′-tripyridylamine, C15H12N4), the Zn center lies on a twofold axis and is coordinated octahedrally by two water molecules and two bidentate 2,2′,2′′-tpa ligands. The perchlorate anions are linked to the coordinated water molecules in the complex cations via O—H...O hydrogen bonds.
Di-μ2-cyanido-dicyanidobis{2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato}(1,4,8,11-tetraazacyclotetradecane)dichromium(III)nickel(II) methanol disolvate
Shi Wang,Wenrui He,Xuehua Ding,Wei Huang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810016995
Abstract: In the title compound, [Cr2Ni(C16H14N2O2)2(CN)4(C10H24N4)]·2CH3OH, each [Cr(salen)(CN)2] unit {salen is 2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolate} acts as a monodentate ligand through one of its two cyanide groups N bound to a central [Ni(cyclam)]2+ core (cyclam is 1,4,8,11-tetraazacyclotetradecane). Each CrIII ion is coordinated by two N and two O atoms from a salen ligand situated in the equatorial plane with two trans cyanide C atoms, yielding a distorted octahedral coordination geometry. The NiII atom lies on an inversion center and is octahedrally coordinated by a cyclam ligand lying in the equatorial plane and by two cyanide N atoms. The asymmetric unit contains one half of the complex molecule and a methanol solvent molecule. In the crystal structure, the complex molecule is linked to the methanol solvent molecules via O—H...O and N—H...O hydrogen bonds. Individual complex molecules are linked by C—H...N hydrogen bonds, forming chains along b.
3-Aminobenzonitrile–3,5-dinitrobenzoic acid (1/1)
Xuehua Ding,Shi Wang,Wenrui He,Wei Huang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811039870
Abstract: The asymmetric unit of the title co-crystal, C7H6N2·C7H4N2O6, contains two formula units of both components. The crystal structure is stabilized by intermolecular O—H...O, N—H...O, N—H...N and C—H...O hydrogen bonds, generating a two-dimensional wave-like network. π–π stacking interactions [centroid–centroid distances = 3.702 (2), 3.660 (2)and 3.671 (2) ] stabilize the crystal packing.
New factorization algorithm based on a continuous representation of truncated Gauss sums
Vincenzo Tamma,Heyi Zhang,Xuehua He,Augusto Garuccio,Yanhua Shih
Physics , 2008, DOI: 10.1080/09500340903254700
Abstract: In this paper, we will describe a new factorization algorithm based on the continuous representation of Gauss sums, generalizable to orders j>2. Such an algorithm allows one, for the first time, to find all the factors of a number N in a single run without precalculating the ratio N/l, where l are all the possible trial factors. Continuous truncated exponential sums turn out to be a powerful tool for distinguishing factors from non-factors (we also suggest, with regard to this topic, to read an interesting paper by S. Woelk et al. also published in this issue [Woelk, Feiler, Schleich, J. Mod. Opt. in press]) and factorizing different numbers at the same time. We will also describe two possible M-path optical interferometers, which can be used to experimentally realize this algorithm: a liquid crystal grating and a generalized symmetric Michelson interferometer.
Analysis of the Problems and Countermeasures of China’s Green Credit  [PDF]
Xiaojie Wu, Xuehua Zhang
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.66009
Abstract: At present, China’s green credit market is the most important channel for green financing and has a great influence on the development of China’s green finance. Based on the collection and arrangement of the related data and information, the paper points out the main problems which is existing in China’s green credit by figures and examples from aspects of detail standards of policies, the matching level between deposits and loans and the management ability of avoiding environmental risk. Furthermore, the paper puts forward corresponding countermeasures of the problems.
A Quantitative Directional Relations Model Considering Topology and Distance
Xuehua TANG
International Journal of Image, Graphics and Signal Processing , 2010,
Abstract: Original models for direction relations ignored the restriction of topology and distance relations to direction representation. To improve the representation of direction relations model by pondering about the influence of topology and distance relations on direction relations, we categorize direction reference frame into topological reference and coarse directions reference and present a new direction relations quantitative and statistics models based on the new direction reference frames. Instead of degree, this new model uses a coordinate-based quantitative method to describe direction relations for the distance restrain, while it reflects the constraints of topology by the direction reference frame and by the coordinate representation. It covers all intricacies imposed by different types of objects and has more sensitivity to the configuration of objects. Experiments have been carried out and the results indicate the excellent efficiency in view of directional description.
Changes in serum complement components after 48 weeks of entecavir treatment in hepatitis B cirrhosis patients
ZHANG Xuehua
Journal of Clinical Hepatology , 2013,
Abstract: ObjectiveTo investigate the effects of entecavir treatment on serum complement components, C3 and C4, in patients with hepatitis B cirrhosis and to determine their relation with treatment response. MethodsNinety-eight patients with hepatitis B cirrhosis who were treated with entecavir (10 mg orally once daily) for 48 weeks were enrolled in the study, and included 48 patients with decompensated cirrhosis and 50 patients with compensated cirrhosis. Blood samples from healthy blood donors were used as controls. The 98 cirrhosis patients were divided into three groups according to hepatitis B virus (HBV) DNA content at baseline (detected by real-time quantitative PCR): low-grade (103 to 105 IU/L); mid-grade (105 to 107 IU/L); high-grade (≥107 IU/L). Levels of C3 and C4 were detected by immunonephelometry, and of the liver function enzyme alanine aminotransferase (ALT) by automated biochemical analysis. Response to treatment was classified as: complete (ALT normalization, HBV DNA reduced to the lower limit of detection (<1000 U/L), and hepatitis B e antigen (HBeAg) seroconversion); partial (one or two of the complete response items achieved); unresponsive (none of the complete response items achieved). Significance of changes in levels before and after the treatment in the patients were assessed by single-factor analysis of variance; multiple group comparisons were made by least significant difference test, using Tamhane test for data that did not assume unequal variances. ResultsTreatment nave cirrhosis patients had significantly lower levels of C3 and C4 than healthy controls (P<0.01). The treatment nave patients with decompensated cirrhosis had significantly lower C3 and C4 levels than their counterparts with compensated cirrhosis (P<0.01). The treatment nave patients with low-level infection showed the lowest level of C3 (P<0.05). Twenty-nine patients acheived complete response, 69 achieved partial response, and there were no unresponsive cases. After treatment, the suppressed levels of C3 and C4 were relieved in the cirrhosis patients, but only the increase seen in the compensated cirrhosis patients was significantly different from the before treatment levels (P<0.01). Patients who achieved complete response had significantly higher C3 and C4 than those who achieved partial response both before and after treatment (P<0.01). Finally, the patients who achieved partial response only showed significantly increased levels of C3 in response to treatment (P<0.05). ConclusionEntecavir treatment increases the HBV-suppressed C3 and C4 in patients with cirrhosi
An improvement on eigenfunction restriction estimates for compact boundaryless Riemannian manifolds with nonpositive sectional curvature
Xuehua Chen
Mathematics , 2012,
Abstract: Let $(M,g)$ be an $n$-dimensional compact boudaryless Riemannian manifold with nonpositive sectional curvature, then our conclusion is that we can give improved estimates for the $L^p$ norms of the restrictions of eigenfunctions to smooth submanifolds of dimension $k$, for $p>\dfrac{2n}{n-1}$ when $k=n-1$ and $p>2$ when $k\leq n-2$, compared to the general results of Burq, G\'erard and Tzvetkov \cite{burq}. Earlier, B\'erard \cite{Berard} gave the same improvement for the case when $p=\infty$, for compact Riemannian manifolds without conjugate points for $n=2$, or with nonpositive sectional curvature for $n\geq3$ and $k=n-1$. In this paper, we give the improved estimates for $n=2$, the $L^p$ norms of the restrictions of eigenfunctions to geodesics. Our proof uses the fact that, the exponential map from any point in $x\in M$ is a universal covering map from $\mathbb{R}^2\backsimeq T_{x}M$ to $M$, which allows us to lift the calculations up to the universal cover $(\mathbb{R}^2,\tilde{g})$, where $\tilde{g}$ is the pullback of $g$ via the exponential map. Then we prove the main estimates by using the Hadamard parametrix for the wave equation on $(\mathbb{R}^2,\tilde{g})$, the stationary phase estimates, and the fact that the principal coefficient of the Hadamard parametrix is bounded, by observations of Sogge and Zelditch in \cite{SZ}. The improved estimates also work for $n\geq 3$, with $p>\frac{4k}{n-1}$. We can then get the full result by interpolation.
Construction of Comprehensive Development Index and Analysis on the Development Trend of Solar Energy Industry  [PDF]
Linlin Jia, Xuehua Zhang, Yahui Wu
Engineering (ENG) , 2018, DOI: 10.4236/eng.2018.108033
Abstract: As a strategic emerging industry, solar energy industry has been wished to ease the energy crisis and stimulate economic growth. In order to judge the development of the industry objectively, this paper constructs the index system of China’s solar energy industrial development from three dimensions of micro enterprise, medium industry and macroeconomic. This paper simultaneously takes 27 specific indicators, 54 listed companies and 10206 data from 2010 to 2016 as an example to calculate the industrial development index. The result reveals that with the implementation of the support policies playing a positive role in the development of China’s solar energy industry, the solar industry has steadily improved. Solar energy industry in our country is under the support of national support policies and its technological innovation capability is relatively active. However, the moderate investment and financing activities and inadequate enterprise operational capacity, to some extent, alleviate the development of the solar energy industry. The above shows that the solar energy industrial development index and its evaluation methods can help people to accurately grasp the development trend of the solar energy industry and accurately identify the development of advantages and disadvantages.
Kernel Based Nonlinear Dimensionality Reduction and Classification for Genomic Microarray
Xuehua Li,Lan Shu
Sensors , 2008, DOI: 10.3390/s8074186
Abstract: Genomic microarrays are powerful research tools in bioinformatics and modern medicinal research because they enable massively-parallel assays and simultaneous monitoring of thousands of gene expression of biological samples. However, a simple microarray experiment often leads to very high-dimensional data and a huge amount of information, the vast amount of data challenges researchers into extracting the important features and reducing the high dimensionality. In this paper, a nonlinear dimensionality reduction kernel method based locally linear embedding(LLE) is proposed, and fuzzy K-nearest neighbors algorithm which denoises datasets will be introduced as a replacement to the classical LLE’s KNN algorithm. In addition, kernel method based support vector machine (SVM) will be used to classify genomic microarray data sets in this paper. We demonstrate the application of the techniques to two published DNA microarray data sets. The experimental results confirm the superiority and high success rates of the presented method.
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