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Now showing items 17 - 32 of 1826

  • Agrobiodiversity: Characterization, Utilization and Managementby D. Wood; J. M. Lenné

    Review by: Daniela Soleri  

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  • Nonlinear optical phenomena in fullerene-doped liquid crystal films and fibers

    Khoo, I.C.   Li, H.   Liang, Y.   Ming Lee   Yarnell, B.   Wang, K.-W.   Wood, M.  

    In this presentation, we shall describe the mechanisms and dynamics of two newly observed phenomena in Fullerene C 60 doped liquid crystal, namely, holographic grating formation in thin film structures and nonlinear pulsed propagation and optical limiting in isotropic liquid crystal cored fibers and fiber arrays. The unusually large photorefractive like nonlinearity of C 60 doped nematic film allows us to write permanent holographic gratings which can be electronically modulated. In fullerene-doped liquid crystalline cored fibers, we have observed greatly enhanced nonlinear optical transmission and propagation effects caused by nonlinear scattering, defocusing, increasing absorption and possibly other nonlinear processes. The resulting lower threshold and reduced interaction-length requirement enable one to design practical liquid crystal fiber arrays that could function as imaging faceplate as well as sensor protection devices
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  • Effects of Social costs on renewables: the case of transparent insulation

    Wood, M.   Jesch, L. F.  

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  • Electrodialytic remediation of CCA-treated waste wood in a 2 m3 pilot plant

    Iben V. Christensen   Anne J. Pedersen   Lisbeth M. Ottosen and Alexandra B. Ribeiro  

    Waste wood that has been treated with chromated-copper-arsenate (CCA) poses a potential environmental problem due to the content of copper, chromium and arsenic.A pilot plant for electrodialytic remediation of up to 2 m3 wood has been designed and tested and the results are presented here. Several process parameters were investigated, and it was found that the use of collecting units and soaking of the wood prior to the electrodialytic process had a positive influence on the remediation process. There was a tendency towards higher removal of CCA from wood chips < 2 cm, compared to larger wood size fractions. The best remediation efficiency was obtained in an experiment with an electrode distance of 60 cm, and 100 kg wood chips. In this experiment 87%copper, 81%chromium and > 95%arsenic were removed. One other experiment was also analysed for arsenic. In this experiment the distance between the working electrodes was 1.5 m and here 95%As was removed. The results showed that arsenic may be the easiest removable of the copper, chromium and arsenic investigated here. This is very encouraging since arsenic is the CCA components of most environmental concern.
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  • Biological Control of Pests, Pathogens, and Weeds: Developments and Prospectsby R. K. S. Wood; M. J. Way

    Review by: D. A. G.  

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  • Fibre-reinforced intermetallic compounds by physical vapour deposition

    Wood, M.   Ward-Close, M.  

    This paper describes work on SiC fibre-reinforced γ-Tial and MoSi2 intermetallic matrix composites (IMCs). Electron beam evaporation and vapour mixing were used to matrix-coat SiC fibre with a thick layer of intermetallic compound, and these coated fibres were successfully fabricated into IMCs. Intermetallic compounds have attractive properties for high-temperature strucrual applications and have been the subject of much research effort in the last 10 years. Progress has been made in improving the ductility of these rather brittle materials, particularly with the titanium aluminides Ti3Al and TiAl, by alloying and thermomechanical processing. However, it is unlikely that monolithic intermetallics will have the right combination of ambient temperature ductility and high-temperature strength to allow widespread commercial application. Further progress depends on the development of engineered materials which exploit the combined potential of ceramics, intermetallics and metals to give an attractive balance of properties.
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  • Fibre-reinforced intermetallic compounds by physical vapour deposition

    Wood, M.   Ward-Close, M.  

    This paper describes work on SiC fibre-reinforced γ-Tial and MoSi2 intermetallic matrix composites (IMCs). Electron beam evaporation and vapour mixing were used to matrix-coat SiC fibre with a thick layer of intermetallic compound, and these coated fibres were successfully fabricated into IMCs. Intermetallic compounds have attractive properties for high-temperature strucrual applications and have been the subject of much research effort in the last 10 years. Progress has been made in improving the ductility of these rather brittle materials, particularly with the titanium aluminides Ti3Al and TiAl, by alloying and thermomechanical processing. However, it is unlikely that monolithic intermetallics will have the right combination of ambient temperature ductility and high-temperature strength to allow widespread commercial application. Further progress depends on the development of engineered materials which exploit the combined potential of ceramics, intermetallics and metals to give an attractive balance of properties.
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  • Zirconium-Catalyzed Asymmetric Cyclohydroamination of Alkenes

    Wood, M.   Leitch, D.   Yeung, C.   Kozak, J.   Schafer, L.  

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  • Search for gamma-ray emission from Galactic novae with the Fermi  -LAT

    Franckowiak, A.   Jean, P.   Wood, M.   Cheung, C. C.   Buson, S.  

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  • World Inventory of Avian Anatomical Specimens: Geographical Analysisby D. S. Wood; M. A. Jenkinson

    Review by: Peter F. Cannell  

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  • Asteroseismology of the PG 1159 star PG 0122+200

    Fu, J.-N.   Vauclair, G.   Solheim, J.-E.   Chevreton, M.   Dolez, N.   O'Brien, M. S.   Kim, S.-L.   Park, B.-G.   Handler, G.   Medupe, R.   Wood, M.   Gonzalez Perez, J.   Hashimoto, O.   Kinugasa, K.   Taguchi, H.   Kambe, E.   Provencal, J.   Dreizler, S.   Schuh, S.   Leibowitz, E.   Lipkin, Y.   Zhang, X.-B.   Paparo, M.   Szeidl, B.   Virághalmy, G.   Zsuffa, D.  

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  • A breakthrough curve analysis of unstable density-driven flow and transport in homogeneous porous media

    Wood, M.   Simmons, C. T.   Hutson, J. L.  

    [1] In certain hydrogeological situations, density variations occur because of changes in solute concentration, temperature, and pressure of the fluid. These include seawater intrusion, high-level radioactive waste disposal, groundwater contamination, and geothermal energy production. Under certain conditions, when the density of the invading fluid is greater than that of the ambient one, gravitational instabilities or fingers may lead to transport over larger spatial scales and significantly shorter timescales than compared with diffusion alone. This study has two key objectives: ( 1) to explore how the nature of a breakthrough curve changes as the density of the invading fluid changes and there is a subsequent transition from stable to unstable behavior and (2) to examine the feasibility of using 1-D advection-dispersion fitting models to fit the experimental data as the density of the invading fluid increases. Thirty-six breakthrough curve experiments were carried out in fully saturated, homogeneous sand columns. Results show that an increase in the density of the source solutions leads to breakthrough curves with lower peak concentrations at breakthrough, earlier peak breakthrough pore volume and time, and an increase in positive skewness of the breakthrough curve. Visual experiments conducted in transparent columns confirm that a transition from stable to unstable behavior occurs as the density of the injectant increases and that backward convective reflux in the high-density cases leads to dilution of the trailing edge of the pulse as evidenced by positively skewed breakthrough curves. These mixed convective systems ( controlled by both forced and free convection) are characterized by a mixed convective ratio. Parameter estimation using a 1-D advection-dispersion fitting model suggests that unstable plume migration can be fitted with an apparent pore flow velocity and dispersivity at low-density gradients. However, as the density of the injectant increases, it becomes progressively difficult to estimate parameters that fit the experimental curves with a model that does not explicitly account for density effects. Significantly poorer matches are obtained when the invading solution concentration is equal to, or exceeds, the solution concentration denoted by ML ( the medium- to low-density solution), i.e., invading solutions greater than approximately 13,000 mg/L in this study. Care must therefore be taken in applying standard advection-dispersion models to breakthrough curve analyses where even modest density differences are encountered.
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  • Biological Control of Pests, Pathogens and Weeds: Developments and Prospects.by R. K. S. Wood; M. J. Way

    Review by: J. H. Lennard  

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  • The Burning Wood: A Christian Encounter with Jewish Midrash – By Judith M. Kunst

    Doreen McFarlane  

    No abstract is available for this article.
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  • Hydrogen production from wood vinegar of camellia oleifera shell by Ni/M/γ-Al2O3 catalyst

    Enchen Jiang   Bosong Li   Mingfeng Wang   Gang Wang   Qian Ma   Dongdong Shi   Xinhui Guo  

    Hydrogen production from wood vinegar was investigated by catalytic reforming with Ni/M/γ-Al2O3 (M = Co, Cr, Fe) as the catalysts. The maximal H2 yield rate and concentration were 22.03 mg/g sample and 64.33% respectively. And the selectivity sequence for hydrogen is Fe, Cr, Co. After catalytic reforming, the content of the compounds was decreased from 16% to 6%. Especially, the content of the acetic acid was decreased from 5.599% to 1.859%, while the content of the phenol was increased from 0.998% to 1.904% due to the demethylation or the demethoxyation of the phenolic compounds. The characteristic analysis showed that the metals of Fe and Ni were the active centers. The amount of carbon deposit was decreased from 5.53% to 2.66%. The distribution of carbon was also shifted to the lower temperature area.
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  • Hydrogen production from wood vinegar of camellia oleifera shell by Ni/M/γ-Al2O3 catalyst

    Xu, Xiwei   Jiang, Enchen   Li, Bosong   Wang, Mingfeng   Wang, Gang   Ma, Qian   Shi, Dongdong   Guo, Xinhui  

    Hydrogen production from wood vinegar was investigated by catalytic reforming with Ni/M/γ-Al2O3 (M = Co, Cr, Fe) as the catalysts. The maximal H2 yield rate and concentration were 22.03 mg/g sample and 64.33% respectively. And the selectivity sequence for hydrogen is Fe, Cr, Co. After catalytic reforming, the content of the compounds was decreased from 16% to 6%. Especially, the content of the acetic acid was decreased from 5.599% to 1.859%, while the content of the phenol was increased from 0.998% to 1.904% due to the demethylation or the demethoxyation of the phenolic compounds. The characteristic analysis showed that the metals of Fe and Ni were the active centers. The amount of carbon deposit was decreased from 5.53% to 2.66%. The distribution of carbon was also shifted to the lower temperature area.
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