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Now showing items 1 - 16 of 1912

  • Impact of free volume on shear band multiplication and bending plasticity

    Li, J.   Ke, C.H.   Tong, X.   Jia, Y.F.   Wu, S.W.   Jia, Y.D.   Yi, J.   Wang, G.  

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  • Acoustic simulation using a novel approach for reducing dispersion error

    Wang, G.   Cui, X.Y.   Li, G.Y.  

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  • Design and Bolometer Characterization of the SPT-3G First-Year Focal Plane

    Everett, W.   Ade, P. A. R.   Ahmed, Z.   Anderson, A. J.   Austermann, J. E.   Avva, J. S.   Thakur, R. Basu   Bender, A. N.   Benson, B. A.   Carlstrom, J. E.   Carter, F. W.   Cecil, T.   Chang, C. L.   Cliche, J. F.   Cukierman, A.   Denison, E. V.   de Haan, T.   Ding, J.   Dobbs, M. A.   Dutcher, D.   Foster, A.   Gannon, R. N.   Gilbert, A.   Groh, J. C.   Halverson, N. W.   Harke-Hosemann, A. H.   Harrington, N. L.   Henning, J. W.   Hilton, G. C.   Holzapfel, W. L.   Huang, N.   Irwin, K. D.   Jeong, O. B.   Jonas, M.   Khaire, T.   Kofman, A. M.   Korman, M.   Kubik, D.   Kuhlmann, S.   Kuo, C. L.   Lee, A. T.   Lowitz, A. E.   Meyer, S. S.   Michalik, D.   Montgomery, J.   Nadolski, A.   Natoli, T.   Nguyen, H.   Noble, G. I.   Novosad, V.   Padin, S.   Pan, Z.   Pearson, J.   Posada, C. M.   Rahlin, A.   Ruhl, J. E.   Saunders, L. J.   Sayre, J. T.   Shirley, I.   Shirokoff, E.   Smecher, G.   Sobrin, J. A.   Stark, A. A.   Story, K. T.   Suzuki, A.   Tang, Q. Y.   Thompson, K. L.   Tucker, C.   Vale, L. R.   Vanderlinde, K.   Vieira, J. D.   Wang, G.   Whitehorn, N.   Yefremenko, V.   Yoon, K. W.   Young, M. R.  

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  • Non-linear quasi-static model of pneumatic artificial muscle actuators

    Wang, G.   Wereley, N. M.   Pillsbury, T.  

    Pneumatic artificial muscles are a class of pneumatically driven actuators that are remarkable for their simplicity, lightweight, high stroke, and high force. The McKibben artificial muscle, which is a type of pneumatic artificial muscle, is composed of an elastomeric bladder, a braided mesh sleeve, and two end fittings. Gaylord first developed an analysis of the McKibben artificial muscle based on the conservation of energy principle. The Gaylord model predicts block force but fails to accurately capture actuation force versus contraction ratio behavior. To address this lack, a non-linear quasi-static model is developed based on finite strain theory. The internal stresses in the bladder are determined by treating it as a cylinder subjected to applied internal pressure and a prescribed kinematic constraint of the outer surface. Subsequently, the force balance approach is applied to derive the equilibrium equations in both the axial and circumferential directions. Finally, the closed-form pneumatic artificial muscle quasi-static actuator force is obtained. The analysis was experimentally validated using actuation force versus contraction ratio test data at a series of discrete inflation pressures for two different pneumatic artificial muscles: a large pneumatic artificial muscle (L = 128.5 mm, B = 7.85 mm, with a latex bladder) and a miniature pneumatic artificial muscle (L = 43.9 mm, B = 2.3 mm, with a V330 elastomeric bladder).
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  • A stable node-based smoothed finite element method for acoustic problems

    Wang, G.   Cui, X.Y.   Feng, H.   Li, G.Y.  

    Highlights • We present a stable node-based smoothed finite element method for acoustic analysis. • The SNS-FEM can greatly reduce the dispersion error for high wave number problems. • The present formulation has higher precision and faster convergence rate. • Higher computational efficiency can be obtained by employing the SNS-FEM. • The developed methodology works well even for extremely distorted meshes. Abstract It is well-known that the classical “overly-soft” node-based smoothed finite element method (NS-FEM) fails to provide reliable results to the Helmholtz equation due to the “temporal instability”. To cure the fatal drawback of NS-FEM and reduce the dispersion error in computational acoustics, this paper proposed a stable node-based smoothed finite element method (SNS-FEM) for analyzing acoustic problems using linear triangular (for 2D space) and tetrahedral (for 3D space) elements that can be generated automatically for any complicated configurations. In the present formulation, the system stiffness matrix is computed using the smoothed acoustic pressure gradients together with the gradient variance items over the smoothing domains associated with nodes of element mesh. It turns out the addition of stabilization term makes the SNS-FEM possess an ideal stiffness, thus successfully cures the temporal instability and significantly reduces the dispersion error in acoustic problems. Numerical examples, including both benchmark cases and practical engineering problems, demonstrate that the SNS-FEM possesses the following important properties: (1) temporal stability; (2) super accuracy and super convergence; (3) higher computational efficiency; (4) insensitive to mesh distortion.
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  • To treat or not to treat, that really is not the question

    Wang, G.   Cutter, G. R.  

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  • Development of a metal-free amine oxidation method utilizing DEAD chemistry

    Wang, G.   Piva de Silva, G.   Wiebe, N. E.   Fehr, G.?M.   Davis, R. L.  

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  • Plastic Flow of a Cu50Zr45Ti5 Bulk Metallic Glass Composite

    Wang, G.   Pauly, S.   Gorantla, S.   Mattern, N.   Eckert, J.  

    By modifying the cooling rate, a Cu50Zr45Ti5 alloy with various structures was developed. A fully glassy rod and specimens with different sizes and volume fractions of nanocrystals were produced. The relationship between the structure and mechanical properties of the Cu50Zr45Ti5 alloy was investigated. The different structures result in a transition of the deformation mechanism from being dominated by shear banding to being governed by dislocation action accompanied by shear band formation. These different plastic deformation mechanisms were discussed in the framework of self-organized critical behavior.
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  • H6 Influenza Viruses Pose a Potential Threat to Human Health

    Wang, G.   Deng, G.   Shi, J.   Luo, W.   Zhang, G.   Zhang, Q.   Liu, L.   Jiang, Y.   Li, C.   Sriwilaijaroen, N.   Hiramatsu, H.   Suzuki, Y.   Kawaoka, Y.   Chen, H.  

    Influenza viruses of the H6 subtype have been isolated from wild and domestic aquatic and terrestrial avian species throughout the world since their first detection in a turkey in Massachusetts in 1965. Since 1997, H6 viruses with different neuraminidase (NA) subtypes have been detected frequently in the live poultry markets of southern China. Although sequence information has been gathered over the last few years, the H6 viruses have not been fully biologically characterized. To investigate the potential risk posed by H6 viruses to humans, here we assessed the receptor-binding preference, replication, and transmissibility in mammals of a series of H6 viruses isolated from live poultry markets in southern China from 2008 to 2011. Among the 257 H6 strains tested, 87 viruses recognized the human type receptor. Genome sequence analysis of 38 representative H6 viruses revealed 30 different genotypes, indicating that these viruses are actively circulating and reassorting in nature. Thirty-seven of 38 viruses tested in mice replicated efficiently in the lungs and some caused mild disease; none, however, were lethal. We also tested the direct contact transmission of 10 H6 viruses in guinea pigs and found that 5 viruses did not transmit to the contact animals, 3 viruses transmitted to one of the three contact animals, and 2 viruses transmitted to all three contact animals. Our study demonstrates that the H6 avian influenza viruses pose a clear threat to human health and emphasizes the need for continued surveillance and evaluation of the H6 influenza viruses circulating in nature. IMPORTANCE Avian influenza viruses continue to present a challenge to human health. Research and pandemic preparedness have largely focused on the H5 and H7 subtype influenza viruses in recent years. Influenza viruses of the H6 subtype have been isolated from wild and domestic aquatic and terrestrial avian species throughout the world since their first detection in the United States in 1965. Since 1997, H6 viruses have been detected frequently in the live poultry markets of southern China; however, the biological characterization of these viruses is very limited. Here, we assessed the receptor-binding preference, replication, and transmissibility in mammals of a series of H6 viruses isolated from live poultry markets in southern China and found that 34% of the viruses are able to bind human type receptors and that some of them are able to transmit efficiently to contact animals. Our study demonstrates that the H6 viruses pose a clear threat to human health.
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  • Electron spin dephasing and optical pumping of nuclear spins in GaN

    Wang, G.   Zhu, C. R.   Liu, B. L.   Ye, H.   Balocchi, A.   Amand, T.   Urbaszek, B.   Yang, H.   Marie, X.  

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  • Double Resonant Raman Scattering and Valley Coherence Generation in Monolayer

    Wang, G.   Glazov, M.?M.   Robert, C.   Amand, T.   Marie, X.   Urbaszek, B.  

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  • Noise mechanisms in a transonic high-pressure turbine stage

    Wang, G.   Sanjose, M.   Moreau, S.   Papadogiannis, D.   Duchaine, F.   Gicquel, L.  

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  • A new TiCuHfSi bulk metallic glass with potential for biomedical applications

    Wang, G.   Fan, H.B.   Huang, Y.J.   Shen, J.   Chen, Z.H.  

    A new Ti41.3Cu43.7Hf13.9Si1.1 bulk metallic glass (BMG), free of Ni, Al and Be elements, was designed using the proper mixing of binary deep eutectics. The alloy exhibited excellent glass forming ability (GFA) and could be cast into single glassy rod up to 3 mm in diameter by copper mould casting method. The appropriate atomic-size mismatch, the large negative heat of mixing among constituent elements, and the possible formation of glassy HfSiO4 facilitated its superior GFA. The BMG also showed good mechanical properties with fracture strength of 1685 MPa and Young's modulus of 95 GPa as well as better corrosion resistance in both NaCl and Hank's solutions, compared with pure Ti and Ti-6Al-4V alloy. The above results demonstrated that the developed BMG is promising in biomedical applications. (C) 2013 Elsevier Ltd. All rights reserved.
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  • Retention studies of recoiling daughter nuclides of 225Ac in polymer vesicles

    Wang, G.   de Kruijff, R.M.   Rol, A.   Thijssen, L.   Mendes, E.   Morgenstern, A.   Bruchertseifer, F.   Stuart, M.C.A.   Wolterbeek, H.T.   Denkova, A.G.  

    Alpha radionuclide therapy is steadily gaining importance and a large number of pre-clinical and clinical studies have been carried out. However, due to the recoil effects the daughter recoil atoms, most of which are alpha emitters as well, receive energies that are much higher than the energies of chemical bonds resulting in decoupling of the radionuclide from common targeting agents. Here, we demonstrate that polymer vesicles (i.e. polymersomes) can retain recoiling daughter nuclei based on an experimental study examining the retention of 221Fr and 213Bi when encapsulating 225Ac. [All rights reserved Elsevier].
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  • Long noncoding RNAs in regulation of human breast cancer

    Wang, G.   Liu, C.   Deng, S.   Zhao, Q.   Li, T.   Qiao, S.   Shen, L.   Zhang, Y.   Lu?, J.   Meng, L.   Liang, C.   Yu, Z.  

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  • Indium Tin Oxide as Catalyst Support for PEM Fuel Cell: RDE and MEA Performance

    Wang, G.   Niangar, E.   Huang, K.   Atienza, D.   Kumar, A.   Dale, N.   Oshihara, K.   Ramani, V. K.  

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