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  • 1
    Electronic Resource
    Electronic Resource
    Impact-Induced delamination in [05, 905, 05] carbon fiber/polyetheretherketone composite laminates (1991)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 1301-1309 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This paper reports both experimental and numerical investigations on delamination mechanisms in [05, 905, 05] carbon fiber(CF)/poly(etheretherketone) (PEEK) laminate subjected to low-velocity impact. It was found that the CF/PEEK composite exhibits the same damage mechanisms as epoxy-based composites, but superior delamination resistance. For the crossply laminate, the impact delamination results from a Mode II interlaminar fracture process, and a close association exists between the interlaminar shear stress field and the delamination growth. The prediction of impact-induced delamination sizes is discussed.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760311804
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    Paper (German National Licenses)
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  • 2
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    Convergence of GAOR Iterative Method with Strictly α Diagonally Dominant Matrices (2011)
    Hindawi
    Details
    Publication Date: 2011-11-16
    Description: We discuss the convergence of GAOR method for linear systems with strictly α diagonally dominant matrices. Moreover, we show that our results are better than ones of Darvishi and Hessari (2006), Tian et al. (2008) by using three numerical examples.
    Print ISSN: 1110-757X
    Electronic ISSN: 1687-0042
    Topics: Mathematics
    Published by Hindawi
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  • 3
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    Attitude and Altitude Controller Design for Quad-Rotor Type MAVs (2013)
    Hindawi
    Details
    Publication Date: 2013-05-10
    Description: Micro air vehicles (MAVs) have a wide application such as the military reconnaissance, meteorological survey, environmental monitoring, and other aspects. In this paper, attitude and altitude control for Quad-Rotor type MAVs is discussed and analyzed. For the attitude control, a new method by using three gyroscopes and one triaxial accelerometer is proposed to estimate the attitude angle information. Then with the approximate linear model obtained by system identification, Model Reference Sliding Mode Control (MRSMC) technique is applied to enhance the robustness. In consideration of the relatively constant altitude model, a Linear Quadratic Gaussian (LQG) controller is adopted. The outdoor experimental results demonstrate the superior stability and robustness of the controllers.
    Print ISSN: 1024-123X
    Electronic ISSN: 1563-5147
    Topics: Mathematics , Technology
    Published by Hindawi
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  • 4
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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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  • 5
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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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  • 6
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    Cutting short the path to murine liver cancer models (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-10-26
    Print ISSN: 0270-9139
    Electronic ISSN: 1527-3350
    Topics: Medicine
    Published by Wiley-Blackwell on behalf of The American Association for the Study of Liver Diseases.
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  • 7
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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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  • 8
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    Advanced Fireworks Algorithm and Its Application Research in PID Parameters Tuning (2016)
    Hindawi
    Details
    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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  • 9
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    Bis (2-mercapto-ethyl) amine modification of macroporous sulfonic resin catalyst in bisphenol-a synthesis (2013)
    Wiley-Blackwell
    Details
    Publication Date: 2013-04-30
    Description: A novel catalyst for bisphenol-A synthesis was prepared by bis (2-mercapto-ethyl) amine adsorbed on macroporous sulfonic resin through neutralization reaction. The physicochemical properties of two resin catalysts before and after bis (2-mercapto-ethyl) amine absorption were compared by scanning electron microscope and nitrogen adsorption. The kinetic of the new catalyst preparation process was studied and found this is a chemical adsorption and endothermic process. The adsorption rate is mainly controlled by the intra-particle diffusion, affected by boundary layer diffusion and chemical reaction as well. The thermodynamic activation parameters were calculated. Compared with unmodified catalyst, the modified resin catalyst showed higher selectivity and acetone conversion in the continuous bisphenol-A synthesis process. © 2013 American Institute of Chemical Engineers AIChE J, 2013
    Print ISSN: 0001-1541
    Electronic ISSN: 1547-5905
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley-Blackwell on behalf of The American Institute of Chemical Engineers (AIChE).
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  • 10
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    Predicting time-to-failure in rock extrapolated from secondary creep (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-02-16
    Description: [1]  Stress relaxation experiments are reported that culminate in energetic failure in rocks analogous to the loading cycle and subsequent localization or reactivation on brittle faults embedded in an elastic medium. Universally, rapid primary deformation arrests and transitions into a long secondary deformation phase that ultimately accelerates to catastrophic rupture. Primary deformation ( u ) conforms to Andrade's law as d u /d t ~  ( t c - t 0 ) θ with a standard exponent of 2/3 . In the long, and readily observable, secondary phase the samples both deform and analogously shed load near-linearly in time. This stress relaxation rate exhibits a robust power-law dependency with time-to-rupture and exhibits the same 2/3 power-law exponent observed in the primary phase. Similarly, the brittle strain energy released in the tertiary collapse scales with a normalized secondary stress relaxation rate. Together, these observations suggest a way to predict both the timing of rupture and its energetics from the observed stress (or strain) rate during the secondary relaxation stage.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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