Mostrando 1,361 - 1,380 Resultados de 99,129 Para Buscar '" metal"', tiempo de consulta: 0.64s Limitar resultados
  1. 1361
    “…We study the full sample period, as well as three subsamples to determine how high-frequency data of precious metals have developed over time. We find that over the full sample, the number of trades has increased substantially over time for each precious metal, while the bid-ask spread has narrowed over time, indicating an increase in liquidity and price efficiency. …”
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  2. 1362
  3. 1363
    por Viehweger, Katrin
    Publicado 2014
    “…Heavy metals are naturally occurring in the earth‘s crust but anthropogenic and industrial activities have led to drastic environmental pollutions in distinct areas. …”
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  4. 1364
    “…This study reports on the observation of metal nanoparticles with different nanostructures for acoustic manipulation. …”
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  5. 1365
    “…We have successfully proposed the application of transition metal compounds in holographic recording media. Such compounds feature an ultra-fast light-induced linkage isomerization of the transition-metal–ligand bond with switching times in the sub-picosecond regime and lifetimes from microseconds up to hours at room temperature. …”
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  6. 1366
    “…Significant divergences are apparent in metal uptake between ASD cases and their control siblings, but only during discrete developmental periods. …”
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  7. 1367
    “…Here we show that the contact resistance is intrinsically dependent on graphene sheet resistance and on the chemistry of the graphene-metal interface. We present a physical model of the contacts based on ab-initio simulations and extensive experiments carried out on a large variety of samples with different graphene-metal contacts. …”
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  8. 1368
    “…Plasmonic resonances in metallic nanoparticles have been used since antiquity to colour glasses. …”
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  9. 1369
  10. 1370
    “…Strain hardening, originating from defects such as the dislocation, avails conventional metals of high engineering reliability in applications. …”
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  11. 1371
    “…Biosorbents for remediating aquatic environmental media polluted with hazardous heavy metals and metalloids such as Pb(II), Cr(VI), Sb(III and V), and As(III and V) were prepared from lignin waste, orange and apple juice residues, seaweed and persimmon and grape wastes using simple and cheap methods. …”
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  12. 1372
    “…Metallic biomaterials are engineered systems designed to provide internal support to biological tissues and they are being used largely in joint replacements, dental implants, orthopaedic fixations and stents. …”
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  13. 1373
    “…Bioleaching is a proven bioprocess for metal recovery by solution from solid matrices, while a bioprecipitation or biomineralization approach is of potential for biorecovery from solution. …”
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  14. 1374
    “…Reaction with pinacol generates bis(pentafluorophenyl)methane 4 as isolable product, proving the transition‐metal‐free deoxygenation of carbon monoxide by this main‐group system. …”
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  15. 1375
  16. 1376
  17. 1377
    “…Insects encounter a variety of metals in their environment, many of which are required at some concentration for normal organismal homeostasis, but essentially all of which are toxic at higher concentrations. …”
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  18. 1378
    “…Here, we introduce a strategy that reveals details of morphological evolution upon shearing up to ultrahigh strains. Our experiments on metallic multilayers find that mechanically stronger layers either fold in a quasi-regular manner and subsequently evolve into periodic vortices, or delaminate into finer layers before mixing takes place. …”
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  19. 1379
    “…Although pressured metallic glass (MG) has been reported in the literature; there are few studies focusing on pressure effects on the structure; dynamics and its plastic deformation. …”
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  20. 1380
    “…In this review we describe recent advances in transition metal oxyhydride chemistry obtained by topochemical routes, such as low temperature reduction with metal hydrides, or high-pressure solid-state reactions. …”
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