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Now showing items 1 - 16 of 323

  • Monotone finite point method for non-equilibrium radiation diffusion equations

    Z. Huang   Y. Li  

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  • Shear-induced detachment of biofilms from hollow fiber silicone membranes

    Z. Huang   E.S. McLamore   H.S. Chuang   W. Zhang   S. Wereley   J.L.C. Leon and M.K. Banks  

    A suite of techniques was utilized to evaluate the correlation between biofilm physiology, fluid-induced shear stress, and detachment in hollow fiber membrane aerated bioreactors. Two monoculture species biofilms were grown on silicone fibers in a hollow fiber membrane aerated bioreactors (HfMBR) to assess detachment under laminar fluid flow conditions. Both physiology (biofilm thickness and roughness) and nutrient mass transport data indicated the presence of a steady state mature biofilm after 3 weeks of development. Surface shear stress proved to be an important parameter for predicting passive detachment for the two biofilms. The average shear stress at the surface of Nitrosomonas europaea biofilms (54.5 ± 3.2 mPa) was approximately 20% higher than for Pseudomonas aeruginosa biofilms (45.8 ± 7.7 mPa), resulting in higher biomass detachment. No significant difference in shear stress was measured between immature and mature biofilms of the same species. There was a significant difference in detached biomass for immature vs. mature biofilms in both species. However, there was no difference in detachment rate between the two species. Biotechnol. Bioeng. 2013; 110: 525–534.
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  • Analysis on a general class of holographic type dark energy models

    Z. Huang   Y. Wu  

    We present a detail analysis on a general class of holographic type dark energy models characterized by the length scale L = 1/a n(t)int 0tdt' a m(t'). We show that n ges 0 is required by the recent cosmic accelerated expansion of universe. In the early universe dominated by the constituent with constant equation of state w m, we have w de ges -1-2n/3 for n ges 0 and m < 0, and w de ges -(2/3)(n-m)+w m for n > m ges 0. The models with n > m ges 0 become single-parameter models like the LambdaCDM model due to the analytic feature Omega de ges d 2/4(2m+3w m+3) 2a 2(n-m) at radiation- and matter-dominated epoch. Whereas the cases n = m ges 0 should be abandoned as the dark energy cannot dominate the universe forever and there might be too large fraction of dark energy in early universe, and the cases m > n ges 0 are forbidden by the self-consistent requirement Omega de << 1 in the early universe. Thus a detailed study on the single-parameter models corresponding to cases n > m ges 0 is carried out by using recent observations. The best-fit analysis indicates that the conformal-age-like models with n = m+1, i.e. Lprop1/Ha in early universe, are more favored and also the models with smaller n for the given n-m are found to fit the observations better. The equation of state of the dark energy in models with n = m+1 > 0 transits from w de < -1 during inflation to w de > -1 in radiation- and matter-dominated epoch, and then back to w de < -1 eventually. The best-fit result of the case (n = 0, m = -1) which is so-called etaHDE model proposed in (Huang 2012) is the most favorable model and compatible with the LambdaCDM model.
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  • Mobile agents affect worm spreading in wireless ad hoc networks

    Z. Huang   S. Wang   X. Xu   J. Sun   Y. Wang  

    Considering the dynamic nature of portable computing devices with wireless communication capability, an extended model is introduced for worm spreading in the wireless ad hoc network, with a population of mobile agents in a planar distribution, starting from an initial infected seed. The effect of agents' mobility on worm spreading is investigated via extensive Monte Carlo simulations. The threshold behavior and the dynamics of worm epidemics in the wireless networks are greatly affected by both agents' mobility and spatial and temporal correlations. The medium access control mechanism for the wireless communication promotes the sensitivity of the spreading dynamics to agents' mobility.
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  • Synchrosqueezing S-Transform and Its Application in Seismic Spectral Decomposition

    Z. Huang   J. Zhang   T. Zhao   Y. Sun  

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  • A wet process to form silicon oxide thin layer for through silicon via application

    Z. Huang   J. Zhang   M. Li  

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  • Determining nuclear localization of alpha-synuclein in mouse brains

    Z. Huang   Z. Xu   Y. Wu   Y. Zhou  

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  • P3.091 Mitochondrial morphology and function in PINK1-deflcient cells and mice

    Z. Huang   R. Akundi   L. Boock   X. Liu   H. Zhu   H.B. üeler  

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  • A new experimental method for determining particle capture efficiency in flotation

    Z. Huang   D. Legendre   P. Guiraud  

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  • NMR Studies of coke laydown on supported V/Al2O3 catalysts

    Z. Huang   J. McGregor   P. Steiner   L.F. Gladden   S. Rugmini   S.D. Jackson  

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  • Quantitative evaluation of powder spray effects on stereovision measurements

    Z. Huang   J. Ni   A. J. Shih  

    The effects of powder spray on surface topography and gauge repeatability and reproducibility (R and R) of a stereovision measurement system are investigated for specular machined components. Results obtained in the micro-scale laser profilometer and macro-scale stereovision measurement of powder sprayed surfaces are correlated. Three artifacts, two step gauges and a gauge ball, all with specular surfaces, are utilized to evaluate this optical, non-contact measurement method. While the use of powder spray has demonstrated the reduction of the measurement noise of the stereovision system, as shown in this study, the surface topography of powder spray is not suitable for νm-level precision measurements with the powder droplets as high as 98.4 νm. The accuracy and gauge R and R of the system for a 32 νm step height are 9.4 and 4.6 νm, respectively. A case study of flatness measurement of an automotive engine head combustion deck surface is conducted.
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  • Low Temperature Molten Salt Preparation of Molybdenum Nanoparticles

    Z. Huang   J. Liu   X. Deng   H. Zhang   L. Lu   Z. Hou   S. Zhang  

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  • Steady-state analysis of short-wavelength, high-gain FELs in a large storage ring

    Z. Huang   K. Bane   Y. Cai   A. Chao   R. Hettel   C. Pellegrini  

    Storage ring FELs have operated successfully in the low-gain regime using optical cavities. Discussions of a high-gain FEL in a storage ring typically involve a special bypass to decouple the FEL interaction from the storage ring dynamics. In this paper, we investigate the coupled dynamics of a high-gain FEL in a large storage ring such as PEP and analyze the equilibrium solution. We show that an FEL in the EUV and soft X-ray regimes can be integrated into a very bright storage ring and potentially provides three orders of magnitude improvement in the average brightness at these radiation wavelengths. We also discuss possibilities of seeding with HHG sources to obtain ultra-short, high-peak power EUV and soft X-ray pulses.
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  • Steady-state analysis of short-wavelength, high-gain FELs in a large storage ring

    Z. Huang   K. Bane   Y. Cai   A. Chao   R. Hettel   C. Pellegrini  

    Storage ring FELs have operated successfully in the low-gain regime using optical cavities. Discussions of a high-gain FEL in a storage ring typically involve a special bypass to decouple the FEL interaction from the storage ring dynamics. In this paper, we investigate the coupled dynamics of a high-gain FEL in a large storage ring such as PEP and analyze the equilibrium solution. We show that an FEL in the EUV and soft X-ray regimes can be integrated into a very bright storage ring and potentially provides three orders of magnitude improvement in the average brightness at these radiation wavelengths. We also discuss possibilities of seeding with HHG sources to obtain ultra-short, high-peak power EUV and soft X-ray pulses.
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  • Preparation and Oxidation of Novel Electrodeposited Cu–Ni–Cr Nanocomposites

    Z. Huang   X. Peng   F. Wang  

    The poor oxidation resistance of Cu-base alloys limits their applications at high temperatures, and it cannot be improved by conventional Cr alloying because that requires an extremely high Cr content. In this work a chromia scale has been formed on novel Cu-base nanocomposites which contain much less chromium. Cu-Ni-Cr nanocomposites, with the weight percentage ratio of Cu/Ni ap 1 and various amounts of Cr, were produced by co-electrodeposition of Cu-Ni alloy with Cr nanoparticles which subsequently acted as "seeds" for chromia formation. The results of oxidation tests in air at 800degC showed that only 15 wt.% Cr in the nanocomposite was required to form an external chromia scale. Furthermore, the scale consisted only of chromia rather than the duplex scales which form on the conventional alloy even when it contains significantly more chromium
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  • Preparation and Oxidation of Novel Electrodeposited Cu–Ni–Cr Nanocomposites

    Z. Huang   X. Peng and F. Wang  

    The poor oxidation resistance of Cu-base alloys limits their applications at high temperatures, and it cannot be improved by conventional Cr alloying because that requires an extremely high Cr content. In this work a chromia scale has been formed on novel Cu-base nanocomposites which contain much less chromium. Cu–Ni–Cr nanocomposites, with the weight percentage ratio of Cu/Ni ≈1 and various amounts of Cr, were produced by co-electrodeposition of Cu–Ni alloy with Cr nanoparticles which subsequently acted as “seeds” for chromia formation. The results of oxidation tests in air at 800掳C showed that only 15 wt.%Cr in the nanocomposite was required to form an external chromia scale. Furthermore, the scale consisted only of chromia rather than the duplex scales which form on the conventional alloy even when it contains significantly more chromium.
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