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Search Results: 1 - 10 of 181176 matches for " WANG Yu-ping "
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A unuqueness theorem for Sturm-Lioville operators with eigenparameter dependent boundary conditions
Yu-Ping Wang
Tamkang Journal of Mathematics , 2012, DOI: 10.5556/j.tkjm.43.2012.145-152
Abstract: In this paper, we discuss the inverse problem for Sturm- Liouville operators with boundary conditions having fractional linear function of spectral parameter on the finite interval $[0, 1].$ Using Weyl m-function techniques, we establish a uniqueness theorem. i.e., If q(x) is prescribed on $[0,frac{1}{2}+alpha]$ for some $alphain [0,1),$ then the potential $q(x)$ on the interval $[0, 1]$ and fractional linear function $frac{a_2lambda+b_2}{c_2lambda+d_2}$ of the boundary condition are uniquely determined by a subset $Ssubset sigma (L)$ and fractional linear function $frac{a_1lambda+b_1}{c_1lambda+d_1}$ of the boundary condition.
An interior inverse problem for Sturm-Liouville operators with eigenparameter dependent boundary conditions
Wang Yu-Ping
Tamkang Journal of Mathematics , 2011, DOI: 10.5556/j.tkjm.42.2011.395-403
Abstract: In this paper, we consider the inverse problem for Sturm-Liouville operators with eigenparameter dependent boundary conditions and show that the potential q(x) can be uniquely determined by a set of values of eigenfunctions at some interior point and parts of two spectra.
Coronary heart disease beliefs and misconceptions among cardiac patients and people with chronic illness  [PDF]
Yu-Ping Lin, Tsae-Jyy Wang, Heng-Hsin Tung, Gill Furze
Open Journal of Nursing (OJN) , 2012, DOI: 10.4236/ojn.2012.21001
Abstract: What people believe about their illness may affect how they cope with it. It has been suggested that such beliefs may be commonly held within society. This cross-sectional investigation examined the cardiac beliefs and misconceptions among cardiac patients and people with chronic illness. Participants with a noncardiac chronic illness hold similar cardiac misconceptions to people with heart disease (p = 0.58). Both groups showed high agreement on “people with heart disease should take life easy” and “always avoid anything that might bring on angina”. People with chronic illness are more likely than cardiac patients to believe that “once you have has one heart attack you are bound to have another one”.
A Hybrid Approach of Using Wavelets and Fuzzy Clustering for Classifying Multispectral Florescence In Situ Hybridization Images
Yu-Ping Wang,Ashok Kumar Dandpat
International Journal of Biomedical Imaging , 2006, DOI: 10.1155/ijbi/2006/54532
Abstract: Multicolor or multiplex fluorescence in situ hybridization (M-FISH) imaging is a recently developed molecular cytogenetic diagnosis technique for rapid visualization of genomic aberrations at the chromosomal level. By the simultaneous use of all 24 human chromosome painting probes, M-FISH imaging facilitates precise identification of complex chromosomal rearrangements that are responsible for cancers and genetic diseases. The current approaches, however, cannot have the precision sufficient for clinical use. The reliability of the technique depends primarily on the accurate pixel-wise classification, that is, assigning each pixel into one of the 24 classes of chromosomes based on its six-channel spectral representations. In the paper we introduce a novel approach to improve the accuracy of pixel-wise classification. The approach is based on the combination of fuzzy clustering and wavelet normalization. Two wavelet-based algorithms are used to reduce redundancies and to correct misalignments between multichannel FISH images. In comparison with conventional algorithms, the wavelet-based approaches offer more advantages such as the adaptive feature selection and accurate image registration. The algorithms have been tested on images from normal cells, showing the improvement in classification accuracy. The increased accuracy of pixel-wise classification will improve the reliability of the M-FISH imaging technique in identifying subtle and cryptic chromosomal abnormalities for cancer diagnosis and genetic disorder research.
Calculation of the Four-Quark Condensates in the QCD Motivated Nambu-Jona- Lasinio Model
Qing Wang,Yu-Ping Kuang,Yu-Ping yi,Tian-Fang Cai
Physics , 1994, DOI: 10.1016/0370-2693(94)00983-X
Abstract: The four-quark condensates appearing in QCD sum rule are calculated nonperturbatively in a realistic QCD motivated extended Nambu-Jona-Lasinio model. The calculation is in the framework of the effective potential for local composite operators up to next-to-the-leading order in the 1/N expansion in which the non-factorized parts of the condensates are included. We show in this paper the possibility of explaining the phenomenological enhancement factor $~\kappa=2.4~$, needed for fitting the data in the factorization approximation, as the contribution of the non-factorized parts of the four- quark condensates.
Nonperturbative Explanation of the Enhancement Factors in QCD Sum Rule for the rho Meson
Shu-Quan Nie,Yu-Ping Kuang,Qing Wang,Yu-Ping Yi
Physics , 1997, DOI: 10.1103/PhysRevD.56.1489
Abstract: Taking the sum rule for the rho meson as an example, we study the possibility of explaining the phenomenological enhamcement factors for certain terms in the vacuum expectation value of the operator product expansion in the QCD sum rule. We take a QCD motivated extended Nambu-Jona-Lasinio (ENJL) model as the low energy effective Lagrangian for QCD with which we calculate the nonperturbative contributions to the vacuum condensate expansion to obtain the enhancement factors. Our result shows that such nonperturbative contributions can cause large enough enhancement factors which can be consistent with the phenomenological values.
Metabolic Activation of the Tumorigenic Pyrrolizidine Alkaloid, Retrorsine, Leading to DNA Adduct Formation In Vivo
Yu-Ping Wang,Peter P. Fu,Ming W. Chou
International Journal of Environmental Research and Public Health , 2005, DOI: 10.3390/ijerph2005010074
Abstract: Pyrrolizidine alkaloids are naturally occurring genotoxic chemicals produced by a large number of plants. The high toxicity of many pyrrolizidine alkaloids has caused considerable loss of free-ranging livestock due to liver and pulmonary lesions. Chronic exposure of toxic pyrrolizidine alkaloids to laboratory animals induces cancer. This investigation studies the metabolic activation of retrorsine, a representative naturally occurring tumorigenic pyrrolizidine alkaloid, and shows that a genotoxic mechanism is correlated to the tumorigenicity of retrorsine. Metabolism of retrorsine by liver microsomes of F344 female rats produced two metabolites, 6, 7-dihydro-7-hydroxy-1-hydroxymethyl-5H-pyrrolizine (DHP), at a rate of 4.8 ± 0.1 nmol/mg/min, and retrorsine-N-oxide, at a rate of 17.6±0.5 nmol/mg/min. Metabolism was enhanced 1.7-fold by using liver microsomes prepared from dexamethasone-treated rats. DHP formation was inhibited 77% and retrorsine N-oxide formation was inhibited 29% by troleandomycin, a P450 3A enzyme inhibitor. Metabolism of retrorsine with lung, kidney, and spleen microsomes from dexamethasone-treated rats also generated DHP and the N-oxide derivative. When rat liver microsomal metabolism of retrorsine occurred in the presence of calf thymus DNA, a set of DHP-derived DNA adducts was formed; these adducts were detected and quantified by using a previously developed 32P-postlabeling/HPLC method. These same DNA adducts were also found in liver DNA of rats gavaged with retrorsine. Since DHP-derived DNA adducts are suggested to be potential biomarkers of riddelliine-induced tumorigenicity, our results indicate that (i) similar to the metabolic activation of riddelliine, the mechanism of retrorsine-induced carcinogenicity in rats is also through a genotoxic mechanism involving DHP; and (ii) the set of DHP-derived DNA adducts found in liver DNA of rats gavaged with retrorsine or riddelliine can serve as biomarkers for the tumorigenicity induced by retronecine-type pyrrolizidine alkaloids.
Correlation of expression profiles between microRNAs and mRNA targets using NCI-60 data
Yu-Ping Wang, Kuo-Bin Li
BMC Genomics , 2009, DOI: 10.1186/1471-2164-10-218
Abstract: Predicted miRNA-mRNA interactions were taken from TargetScan 4.1 and miRBase release 5. Pearson correlation coefficients between the miRNA and the mRNA expression profiles were computed using NCI-60 data. The correlation coefficients were then subject to the Benjamini and Hochberg correction. Our results show that the percentage of TargetScan-predicted miRNA-mRNA interactions having negative correlation in expression profiles is higher than that of miRBase-predicted pairs. Using the experimentally validated miRNA targets listed in TarBase, genes involved in mRNA degradation show more negative correlations between miRNA and mRNA expression profiles, comparing with genes involved in translational repression. Furthermore, correlation analysis for miRNAs and mRNAs transcribed from the same genes shows that correlations of expression profiles between intronic miRNAs and host genes tend to be positive. Finally we found that a target gene might be down-regulated by more than one miRNAs sharing the same seed region.Our results suggest that expression profiles can be used in the computational identification of functional miRNA-target associations. One can expect a higher chance of finding negatively correlated expression profiles for TargetScan-predicted interactions than for miRBase-predicted ones. With limited experimentally validated miRNA-target interactions, expression profiles can only serve as a supplementary role in finding interactions between miRNAs and mRNAs.MicroRNAs (miRNAs) were first identified in Caenorhabditis elegans. Since then more than 5,000 sequences have been found and annotated in many organisms [1]. MiRNAs are small non-coding RNA molecules regulating gene expression through various mechanisms [1-3]. Many biological processes, such as development, cell differentiation, and even diseases, have been associated with the activity of miRNAs [4,5]. Given that miRNAs function through binding to the 3' untranslated regions (UTRs) of mRNAs, computational algo
Di-μ-thiocyanato-κ4N:N-bis({5-methoxy-2-[3-(methylamino)propyliminomethyl]phenolato-κ3O1,N,N′}copper(II))
Nong Wang,Rui Xue,Bo Li,Yu-Ping Yang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810015564
Abstract: The title thiocyanate-bridged dinuclear copper(II) complex, [Cu2(C12H17N2O2)2(NCS)2], possesses crystallographic inversion symmetry. Each CuII atom is five-coordinated by one imine N, one amine N and one phenolate O atom of the Schiff base ligand, and by two N atoms from two bridging thiocyanate ligands, forming a square-pyramidal geometry. Beside the two thiocyanate bridges, there are two intramolecular N—H...O hydrogen bonds, which further link the two Cu(C12H17N2O2)(NCS) units. The Cu...Cu separation is 3.261 (2) . Parts of the methylaminopropylimino segment are disordered over two sites with occupancies of 0.669(9) and 0.331(9).
Photocatalytic degradation of L-acid by TiO2 supported on the activated carbon
WANG Yu-ping,WANG Lian-jun,PENG Pan-ying,
WANG Yu-ping
,WANG Lian-jun,PENG Pan-ying

环境科学学报(英文版) , 2006,
Abstract: TiO2 sol was prepared by sol-gel technique with tetrabutyl titanate as precursor. Supported TiO2 catalysts on activated carbon were prepared by soak and sintering method. The aggregation of nano-TiO2 particles can be effectively suppressed by added polyethylene glycol (PEG) as a surface modifier. The average particle diameter of TiO2, specific surface area and absorbability of catalyst can be modified. Based on characteristics of the TiO2 photocatalyst with XRD, specific surface area, adsorption valves of methylene blue and the amount of TiO2 supported on the activated carbon, the photocatalytic degradation of L-acid was studied. The effect of the factors, such as pH of the solution, the initial concentration of L-acid on the photocatalytic degradation of L-acid, were studied also. It was found that when the pH of the solution is 1.95, the amount of photocatalyst is 0.5 g, the concentration of the L-acid solution is 1.34 x 10(-3) mol/L and the illumination time is 7 h, the photocatalytic degradation efficiency of L-acid can reach 89.88%. The catalyst was reused 6 times and its degradation efficiency hardly changed.
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