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  • Wiley-Blackwell  (15)
  • Hindawi  (6)
  • Institute of Physics (IOP)  (6)
  • Cham :Springer International Publishing AG,
  • 2015-2019  (27)
  • 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
    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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  • 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
    Details
    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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    Phonon chirality tuned through interface transmission in a one-dimensional atomic junction model (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-05
    Description: There has been growing interest in revealing exotic properties of chiral phonons since they were found in honeycomb AB lattice, and very recently they were experimentally verified in a tungsten diselenide monolayer (2018 Science 359 579). In this work, we manipulate phonon chirality through interface transmission via a one-dimensional atomic junction model by using the scattering boundary method. Due to the difference of phase change between two transverse directions induced by the anisotropy at interface coupling, the phonon polarization can be tuned between circular and linear in the high-frequency range. In a double-junction atomic model with an anisotropic center, we find that the phase change accumulates when the phonon transmits through the interface material thus the phonon can be tuned between different chirality in the medium frequency range. The phase change is found to linearly depend on the width of the interface material, while the transmission coeffic...
    Electronic ISSN: 1367-2630
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 8
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    Study on Thermal Kinetics of nano Al/micro MnO 2 Thermite System (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-10-12
    Description: In order to explore the thermal kinetics of nano Al-micro MnO 2 thermite system, the Al/MnO 2 thermite sample was mixed by the ultrasonic dispersion method. On the basis of the study of thermal decomposition of MnO 2 powder, the thermal performance of the sample was study by simultaneous thermal analysis technique at the temperature range from room temperature to 1000°C, which could found the thermite reaction occurred in 650-660°C before the melting of Al, which belongs to solid state reactions with the 350 J/g heat releasing. Besides, the microstructure changes of the thermite during reaction were observed by field emission scanning electron microscope (FE-SEM). Based on the TG-DSC test with multiple heating rates and using of the activation energy calculated by Kissniger method, it could be proved the sample had good stability and safety performance.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 9
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    Study on Thermal Chemical Reaction of Al/MnO 2 Thermite (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-10-12
    Description: To explore the reaction characteristics and mechanism of Al/MnO 2 thermite, selecting the high purity micron grade Al and MnO 2 powder, the Al/MnO 2 thermite sample was mixed by the ultrasonic dispersion method. On the basis of the study of thermal decomposition of MnO 2 powder, the thermal performance of the sample was study by simultaneous thermal analysis technique at the temperature range from room temperature to 900°C, and the reaction products were analyzed by X-ray diffraction (XRD). The microstructure changes of the thermite during reaction were observed by field emission scanning electron microscope (FE-SEM). The results showed that the MnO 2 has two processes of thermal decomposition during the temperature rising, and the reaction products were Mn 2 O 3 and Mn 3 O 4 , and the onset temperature were 498.3°C and 781.5°C, the heat release were - 197.1J/g and -57.4 J/g, respectively. Al/...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 10
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    Hydroconversion of waste cooking oil into biojet fuel over hierarchical NiMo/USY@Al-SBA-15 zeolite (2017)
    Wiley-Blackwell
    Details
    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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