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  • Wiley-Blackwell  (5)
  • Hindawi  (4)
  • Institute of Physics (IOP)  (1)
  • Cham :Springer International Publishing AG,
  • 2015-2019  (10)
  • 2015  (10)
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  • 2015-2019  (10)
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  • 1
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    A hybrid wavelet analysis- cloud model data-extending approach for meteorologic and hydrologic time series (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-04-17
    Description: For scientific and sustainable management of water resources, hydrologic and meteorologic data series need to be often extended. This paper proposes a hybrid approach, named WA-CM (Wavelet Analysis-Cloud Model), for data series extension. Wavelet analysis has time-frequency localization features, known as ‘mathematics microscope,’ that can decompose and reconstruct hydrologic and meteorologic series by wavelet transform. The cloud model is a mathematical representation of fuzziness and randomness, and has strong robustness for uncertain data. The WA-CM approach first employs the wavelet transform to decompose the measured non-stationary series and then uses the cloud model to develop an extension model for each decomposition layer series. The final extension is obtained by summing the results of extension of each layer. Two kinds of meteorologic and hydrologic data sets with different characteristics and different influence of human activity from 6 (3 pairs) representative stations are used to illustrate the WA-CM approach. The approach is also compared with four other methods, which are conventional Correlation Extension (CE) method, Kendall-Theil Robust Line method (KTRL), Artificial Neural Network (ANN) method (BP, MLP and RBF), and single Cloud Model (CM) method. To evaluate the model performance completely and thoroughly, five measures are used, which are RE, MRE, SD-RE, RMSE and TIC. Results show that the WA-CM approach is effective, feasible and accurate, and is found to be better than other four methods compared. The theory employed and the approach developed here can be applied to extension of data in other areas as well.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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  • 2
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    Nanoparticles-Assisted Stem Cell Therapy for Ischemic Heart Disease (2015)
    Hindawi
    Details
    Publication Date: 2015-12-30
    Description: Stem cell therapy has attracted increasing attention as a promising treatment strategy for cardiac repair in ischemic heart disease. Nanoparticles (NPs), with their superior physical and chemical properties, have been widely utilized to assist stem cell therapy. With the help of NPs, stem cells can be genetically engineered for enhanced paracrine profile. To further understand the fate and behaviors of stem cells in ischemic myocardium, imaging NPs can label stem cells and be tracked in vivo under multiple modalities. Besides that, NPs can also be used to enhance stem cell retention in myocardium. These facts have raised efforts on the development of more intelligent and multifunctional NPs for cellular application. Herein, an overview of the applications of NPs-assisted stem cell therapy is given. Key issues and future prospects are also critically addressed.
    Electronic ISSN: 1687-9678
    Topics: Medicine
    Published by Hindawi
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  • 3
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    Simulating Molecular Interactions of Carbon Nanoparticles with a Double-Stranded DNA Fragment (2015)
    Hindawi
    Details
    Publication Date: 2015-10-23
    Description: Molecular interactions between carbon nanoparticles (CNPs) and a double-stranded deoxyribonucleic acid (dsDNA) fragment were investigated using molecular dynamics (MD) simulations. Six types of CNPs including fullerenes (C60 and C70), () single-walled carbon nanotube (SWNT), () double-walled carbon nanotube (DWNT), graphene quantum dot (GQD), and graphene oxide quantum dot (GOQD) were studied. Analysis of the best geometry indicates that the dsDNA fragment can bind to CNPs through pi-stacking and T-shape. Moreover, C60, DWNT, and GOQD bind to the dsDNA molecules at the minor groove of the nucleotide, and C70, SWNT, and GQD bind to the dsDNA molecules at the hydrophobic ends. Estimated interaction energy implies that van der Waals force may mainly contribute to the mechanisms for the dsDNA-C60, dsDNA-C70, and dsDNA-SWNT interactions and electrostatic force may contribute considerably to the dsDNA-DWNT, dsDNA-GQD, and dsDNA-GOQD interactions. On the basis of the results from large-scale MD simulations, it was found that the presence of the dsDNA enhances the dispersion of C60, C70, and SWNT in water and has a slight impact on DWNT, GQD, and GOQD.
    Print ISSN: 2090-9063
    Topics: Chemistry and Pharmacology
    Published by Hindawi
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  • 4
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    A Combined Raman Spectroscopic and Thermogravimetric Analysis Study on Oxidation of Coal with Different Ranks (2015)
    Hindawi
    Details
    Publication Date: 2015-11-24
    Description: Raman spectroscopy and nonisothermal thermogravimetric analysis (TGA) measurements have been reported for different rank coals (lignite, bituminous coal, and anthracite) and the relationship between the measurements was examined. It was found that the Raman spectra parameters can be used to characterize structure changes in the different rank coals, such as the band area ratios based on the curve-fitted results. Higher ranked coal was found to have higher values of and but lower values of , , , and . The oxidation properties of the coal samples were characterized by the reactivity indexes , , and from TGA data which were found to correlate well with the band area ratios of , , and . Based on these correlations, the Raman band area ratios were found to correlate with the oxidation activity of coal providing additional structural information which can be used to understand the changes in the TGA measurements.
    Print ISSN: 2090-8865
    Electronic ISSN: 2090-8873
    Topics: Chemistry and Pharmacology
    Published by Hindawi
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  • 5
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    Visible-Light-Driven Photocatalysts of Two Copper(II) Coordination Polymers with Rare Sulfonate and Imidazole Co-Ligand System (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-05-07
    Description: Two copper coordination polymers (CPs) [Cu(1,2-BIYB) 2 (AQ-2,6-DA)] n · nH 2 O ( 1 ) and [Cu(1,4-BIYB) 2 (AQ-2,7-DA)] n · 3 n H 2 O ( 2 ) were obtained by reactions of pentahydrate copper sulfate with corresponding sulfonate and imidazole ligand under hydrothermal conditions, respectively [Na 2 AQ-2,7-DA = anthraquinone-2,7-disulfonic acid disodium salt, Na 2 AQ-2,6-DA = anthraquinone-2,6-disulfonic acid disodium salt, 1,4-BIYB = 1,4-bis(imidazol-1-ylmethyl)benzene, 1,2-BIYB = 1,2-bis(imidazol-1-ylmethyl)benzene]. CPs 1 and 2 show different structures: CP 1 has a 2D architecture, which is further extended into a 3D supramolecular structure through hydrogen bonding interactions, whereas CP 2 has a 1D architecture, which generates a 3D supramolecular structure via hydrogen bonding and strong π ··· π interaction. Notably, CPs 1 and 2 feature rare examples of CPs based visible-light-driven photocatalysts and reveal good stability toward photocatalysis.
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley-Blackwell
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  • 6
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    Study of phase behavior and physical properties of a natural gas reservoir with high carbon dioxide content (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-12-22
    Description: The discovery of natural gas reservoirs with high and varying CO 2 content (5% to 98%) in China has attracted worldwide attention. In this paper, the phase diagram of natural gas with different CO 2 content was calculated and drawn by PVT Sim 100 which was fitted by experimental data based on the Ruska PVT 2730 apparatus. Both the real critical parameters and the pseudo-critical para­meters were calculated and compared. Also, the phase state of natural gas along the wellbore in a representative well under both shut-in and flowing conditions was analyzed. In addition, to clarifying the phase transition process, videos of a gas sample showed variation between supercritical state to gas-liquid state with isobaric cooling and heating up between 35°C and 25°C. Moreover, the compressibility factor (Z-factor) of the natural gas with different CO 2 content was chosen as one of the key physical parameters of natural gas to measure at pressures ranging from atmospheric pressure to 45 MPa and temperatures ranging from 40°C to 140°C experimentally. Results show that the Z factor decreases with the increase of CO 2 content in natural gas at isothermal conditions, and increases with the increase of temperature. Furthermore, a new model is proposed to predict pressure and Z factor. The varying CO 2 -CH 4 concentrations of this reservoir are relevant to gas compositions which may arise in depleted natural gas reservoirs used for geologic carbon sequestration. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd
    Electronic ISSN: 2152-3878
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Published by Wiley-Blackwell
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  • 7
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    Probing HZγ and Hγγ anomalous couplings in the process e + e − → Hγ (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-11-27
    Description: We propose to measure the HZγ and Hγγ anomalous couplings in the process e + e − → Hγ with the sequential decay of H → bb̄. The discovery potential of observing the anomalous couplings are explored in detail. Our study shows that future electron-positron colliders have great potential to test the HZγ and Hγγ couplings. Conservative bounds on the two anomalous couplings are also derived when no new physics signal is detected on top of the SM backgrounds.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 8
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    Feasibility study of using intravoxel incoherent motion mri to detect parotid gland abnormalities in early-stage Sjögren syndrome patients (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-11-21
    Description: Purpose To determine whether intravoxel incoherent motion (IVIM) magnetic resonance imaging (MRI) could detect parotid gland abnormalities in Sjögren's syndrome (SS) patients who were not identified by conventional MRI. Materials and Methods Ten consecutive patients with clinically proven SS who were not identified by conventional MRI were assessed by IVIM MRI with a 3.0T MRI scanner. Quantitative parameters (tissue diffusivity, D; pseudodiffusion coefficient, D*; perfusion fraction, f) derived from IVIM MRI were compared between the SS group and healthy control group ( n  = 15). A receiver operating characteristic (ROC) curve was used to evaluate the diagnostic value of each significant parameter. Results Excellent inter- and intrareader agreements were obtained during the measurement of D, f, and D* values (interreader, 0.980, 0.942, and 0.883; intrareader, 0.991, 0.952, and 0.896, respectively). All three parameters of the SS group were significantly higher than those of the healthy group (D, 1.049 ± 0.056 × 10 −3 mm 2 /s vs. 0.976 ± 0.116 × 10 −3 mm 2 /s, P  = 0.012; D*, 20.410 ± 1.786 × 10 −3 mm 2 /s vs. 18.764 ± 2.433 × 10 −3 mm 2 /s, P  = 0.013; f, 0.207 ± 0.003 vs. 0.182 ± 0.002, P  = 0.004). ROC analysis showed that the f value had the best diagnostic performance (AUC, 0.712; Sensitivity, 0.80; Specificity, 0.57; Cutoff value, 0.185) in detecting the parotid gland abnormalities in early SS patients. Conclusion IVIM MRI detected parotid gland abnormalities in early-stage SS patients. J. Magn. Reson. Imaging 2015.
    Print ISSN: 1053-1807
    Electronic ISSN: 1522-2586
    Topics: Medicine
    Published by Wiley-Blackwell
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  • 9
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    Near infrared in vivo flow cytometry for tracking fluorescent circulating cells (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-07-03
    Description: The in vivo flow cytometry (IVFC) is now a powerful technique in biomedical research, especially for tracking specific cells in circulatory system. The current fluorescence-based IVFC is limited to visible spectrum, while near infrared (NIR) dyes have their advantages, such as deeper penetration, less absorption and less scattering for NIR fluorescence. Here, using an NIR in vivo flow cytometer with a 785 nm laser excitation, the measurement of fluorescent dye IR-780 labeled circulating cells is demonstrated. Representative peaks corresponding to NIR fluorescent circulating cells are detected and quantified. In addition, blood flow information, including the blood flow velocity and flow volume per unit time, is obtained. By simultaneous detection of IR-780 and enhanced green fluorescent protein (EGFP) signals from dual labeled cells, the IR-780 is shown to be a suitable fluorescent dye for multicolor detection by IVFC, including NIR. Thus, the IVFC is extended to the NIR range and shows potential application in biomedical research. © 2015 International Society for Advancement of Cytometry
    Electronic ISSN: 1552-4930
    Topics: Biology , Medicine
    Published by Wiley-Blackwell
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  • 10
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    A Coupled User Clustering Algorithm Based on Mixed Data for Web-Based Learning Systems (2015)
    Hindawi
    Details
    Publication Date: 2015-08-18
    Description: In traditional Web-based learning systems, due to insufficient learning behaviors analysis and personalized study guides, a few user clustering algorithms are introduced. While analyzing the behaviors with these algorithms, researchers generally focus on continuous data but easily neglect discrete data, each of which is generated from online learning actions. Moreover, there are implicit coupled interactions among the data but are frequently ignored in the introduced algorithms. Therefore, a mass of significant information which can positively affect clustering accuracy is neglected. To solve the above issues, we proposed a coupled user clustering algorithm for Wed-based learning systems by taking into account both discrete and continuous data, as well as intracoupled and intercoupled interactions of the data. The experiment result in this paper demonstrates the outperformance of the proposed algorithm.
    Print ISSN: 1024-123X
    Electronic ISSN: 1563-5147
    Topics: Mathematics , Technology
    Published by Hindawi
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