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  • 1
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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
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    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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  • 2
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    A Coupled User Clustering Algorithm Based on Mixed Data for Web-Based Learning Systems (2015)
    Hindawi
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    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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  • 3
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    Simulating Molecular Interactions of Carbon Nanoparticles with a Double-Stranded DNA Fragment (2015)
    Hindawi
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    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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    Advanced Fireworks Algorithm and Its Application Research in PID Parameters Tuning (2016)
    Hindawi
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    Publication Date: 2016-06-21
    Description: Proportional-Integral-Derivative (PID) controller is one of the most widely used controllers for its property of simplicity and practicability. In order to design high-quality performances PID controllers, an Advanced Fireworks (AFW) algorithm based on self-adaption principle and bimodal Gaussian function is proposed, which is built to optimize the PID controller by parameters tuning. Firstly, a compound index of optimization performance is formulated, and then the extremal optimization method of PID control system is proposed. Secondly, a PID parameters tuning model combined with AFW is built. At last, 5 typical transfer functions are simulated to obtain optimal parameters by AFW and contrast tuning method, such as Ziegler-Nichols method, Enhanced Fireworks (EFW) algorithm, and Particle Swarm Optimization (PSO). Simulation results show that AFW are effective and are easily implemented methods to solve PID control problems of different transfer functions.
    Print ISSN: 1024-123X
    Electronic ISSN: 1563-5147
    Topics: Mathematics , Technology
    Published by Hindawi
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  • 5
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    Palaeomagnetism and detrital zircon U–Pb geochronology of Cretaceous redbeds from central Tibet and tectonic implications (2017)
    Wiley-Blackwell
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    Publication Date: 2017-12-08
    Description: Understanding the magnitude of intra-Asian crustal shortening and the collision age of Lhasa–Qiangtang terranes requires quantitative constraints on the crustal motion. The key to this is defining the palaeogeography of the Tibetan Plateau, which constitutes a poorly known factor over the entire convergence history. New detrital zircon U–Pb geochronological and palaeomagnetic data from the terrestrial Abushan Formation in the Qiangtang terrane demonstrate that central Tibet was located at 27.5 ± 3.0°N during the time interval of ~111–83 Ma. Our results suggest 7.5 ± 2.9° continental shortening has occurred between central Qiangtang and Mongolia during the India–Asia convergence. Declination anomaly indicates the central Qiangtang terrane has experienced significant clockwise rotation (57.3 ± 3.9°) relative to stable Eurasia. The compilation of palaeomagnetic results since the Cretaceous reveals ~8.5° northward drift of the Lhasa terrane from 123 ± 9 to 97 ± 7 Ma and the palaeolatitudinal overlap between the Lhasa and Qiangtang terranes after ~111–103 Ma. Together with the onset age of the terrestrial Abushan Formation, our results provide the youngest timing ( ca. ~111–103 Ma) for the closure of the Bangong Meso-Tethys Ocean, as well as for the final collision of the Lhasa and Qiangtang terranes.
    Print ISSN: 0072-1050
    Electronic ISSN: 1099-1034
    Topics: Geosciences
    Published by Wiley-Blackwell
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  • 6
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    The effects of hydrogen band EMIC waves on ring current H+ ions (2017)
    Wiley-Blackwell
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    Publication Date: 2017-11-21
    Description: Hydrogen band electromagnetic ion cyclotron (EMIC) waves have received much attention recently because they are found to frequently span larger spatial areas than the other band EMIC waves. Using test particle simulations, we study the nonlinear effects of hydrogen band EMIC waves on ring current H + ions. A dimensionless parameter R is used to characterize the competition between wave-induced and adiabatic motions. The results indicate that there are three regimes of wave-particle interactions for typical 35 keV H + ions at L =5: diffusive (quasi-linear) behavior when α eq ≤ 35° ( R ≥ 2.45), the nonlinear phase trapping when 35° 〈 α eq 〈 50° (0.75 〈 R 〈 2.45), and both the nonlinear phase bunching and phase trapping when α eq ≥ 50° ( R ≤ 0.75). The phase trapping can transport H + ions towards large pitch angle, while the phase bunching has the opposite effect. The phase trapped H + ions can be significantly accelerated (from 35 keV to over 500 keV) in about 4 minutes, and thus contribute to the formation of high energy components of ring current ions. The results suggest that the effect of hydrogen band EMIC waves is not ignorable in the nonlinear acceleration and resonance scattering of ring current H + ions.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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  • 7
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    Hydroconversion of waste cooking oil into biojet fuel over hierarchical NiMo/USY@Al-SBA-15 zeolite (2017)
    Wiley-Blackwell
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    Publication Date: 2017-12-19
    Description: The direct conversion of waste cooking oil (WCO) into bio-jet fuel was investigated over the core-shell hierarchical USY@Al-SBA-15 zeolite supported NiMo catalyst. The core-shell structure showed better acid and pore size distribution. The synergetic effect of core-shell micropore and mesopore structure significantly contributed to enhance the selectivity of jet fuel (C 9-15 hydrocarbons) from 9.3% over NiMo/USY up to 35.7% over NiMo/USY@Al-SBA-15 with high isomerization ( iso/n- paraffins ratio=2.7) and moderate aromatic fraction (18.7%). The DCO 2 reaction was selectively enhanced. The optimal selectivity for jet fuel (39.7%) was obtained at 380 o C and high H 2 /oil ratio would decrease the yield of jet fuel. This catalyst showed excellent stability for hydroconversion of WCO to hydrocarbons.
    Print ISSN: 0930-7516
    Electronic ISSN: 1521-4125
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley-Blackwell
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  • 8
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    AlGaAs/Si dual-junction tandem solar cells by epitaxial lift-off and print-transfer-assisted direct bonding (2018)
    Wiley-Blackwell
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    Publication Date: 2018-01-05
    Description: A novel method is developed to realize a III-V/Si dual-junction photovoltaic cell by combining epitaxial lift-off (ELO) and print-transfer-assisted bonding methods. The adoption of ELO enables III-V wafers to be recycled and reused, which can further lower the cost of III-V/Si photovoltaic panels. For demonstration, high crystal quality, micrometer-thick, GaAs/AlGaAs/GaAs films are lifted off, transferred, and directly bonded onto Si wafer without the use of any adhesive or bonding agents. The bonding interface is optically transparent and conductive both thermally and electrically. Prototype AlGaAs/Si dual-junction tandem solar cells have been fabricated and exhibit decent performance. A novel method is developed to realize an III-V/Si multijunction photovoltaic device by combining the epitaxial lift-off (ELO) and print-transfer-assisted bonding methods. The adoption of ELO enables III-V wafers to be recycled and reused, which is promising to further lower the cost of III-V/Si photovoltaic panels.
    Electronic ISSN: 2050-0505
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Wiley-Blackwell
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  • 9
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    Predicting IDH mutation status in grade II gliomas using amide proton transfer-weighted (APTw) MRI (2017)
    Wiley-Blackwell
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    Publication Date: 2017-07-18
    Description: Purpose To assess the amide proton transfer-weighted (APTw) MRI features of isocitrate dehydrogenase (IDH)-wildtype and IDH-mutant grade II gliomas and to test the hypothesis that the APTw signal is a surrogate imaging marker for identifying IDH mutation status preoperatively. Methods Twenty-seven patients with pathologically confirmed low-grade glioma, who were previously scanned at 3T, were retrospectively analyzed. The Mann-Whitney test was used to evaluate relationships between APTw intensities for IDH-mutant and IDH-wildtype groups, and receiver operator characteristic (ROC) analysis was used to assess the diagnostic performance of APTw. Results Based on histopathology and molecular analysis, seven cases were diagnosed as IDH-wildtype grade II gliomas and 20 cases as IDH-mutant grade II gliomas. The maximum and minimum APTw values, based on multiple regions of interest, as well as the whole-tumor histogram-based mean and 50th percentile APTw values, were significantly higher in the IDH-wildtype gliomas than in the IDH-mutant groups. This corresponded to the areas under the ROC curves of 0.89, 0.76, 0.75, and 0.75, respectively, for the prediction of the IDH mutation status. Conclusion IDH-wildtype lesions typically were associated with relatively high APTw signal intensities as compared with IDH-mutant lesions. The APTw signal could be a valuable imaging biomarker by which to identify IDH1 mutation status in grade II gliomas. Magn Reson Med, 2017. © 2017 International Society for Magnetic Resonance in Medicine.
    Print ISSN: 0740-3194
    Electronic ISSN: 1522-2594
    Topics: Medicine
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  • 10
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    A hybrid wavelet analysis- cloud model data-extending approach for meteorologic and hydrologic time series (2015)
    Wiley-Blackwell
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    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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