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31.
Korolev Vadim V. Bean Jonathan J. Nevolin Yurii M. Kucherinenko Yaroslav V. McKenna Keith P. Protsenko Pavel V. 《Metallurgical and Materials Transactions A》2022,53(2):449-459
Metallurgical and Materials Transactions A - The misorientation of 515 grain boundaries has been determined using electron backscatter diffraction data from an 18 μm thick copper foil with... 相似文献
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Yurii Izyumov 《The Physics of Metals and Metallography》2006,102(1):90-90
Strength and Plasticity
Twenty years later 相似文献34.
We present steady state and time-resolved photoluminescence (PL) characteristics of differently charged CdTe quantum dots (QDs) adsorbed onto a polyelectrolyte (PE) multilayer. The PE multilayer is built up using a layer-by-layer assembly technique. We find that the diffusion of the QDs into the PE multilayer is an important factor in the case of 3-mercapto-1, 2-propanediol stabilized QDs (neutral surface charge), resulting in a ~31-fold enhancement in PL intensity accompanied by a blue shift in the PL spectra and an increase in decay lifetime from 3.74?ns to a maximum of 11.65?ns. These modified emission properties are attributed to the enhanced surface related emission resulting from the interaction of the QD's surface with the PE. We find that diffusion does not occur for thioglycolic acid (TGA) stabilized QDs (negative surface charge) or 2-mercaptoethylamine stabilized QDs (positive surface charge), indicating localization of the QDs on top of the PE multilayer. However, the PL lifetime of the TGA stabilized QDs decreases from 9.58 to 5.78?ns with increasing PE multilayer thickness. This provides evidence for increased intrinsic exciton recombination relative to surface related emission, which results in an overall reduction in the average lifetime. Our studies indicate the importance of the QD surface charge in determining the interaction with the PE multilayers and the subsequent modification of the QD emission properties. 相似文献
35.
Zalyubovskiy SJ Bogdanova M Deinega A Lozovik Y Pris AD An KH Hall WP Potyrailo RA 《Journal of the Optical Society of America. A, Optics, image science, and vision》2012,29(6):994-1002
In this paper, the theoretical sensitivity limit of the localized surface plasmon resonance (LSPR) to the surrounding dielectric environment is discussed. The presented theoretical analysis of the LSPR phenomenon is based on perturbation theory. Derived results can be further simplified assuming quasistatic limit. The developed theory shows that LSPR has a detection capability limit independent of the particle shape or arrangement. For a given structure, sensitivity is directly proportional to the resonance wavelength and depends on the fraction of the electromagnetic energy confined within the sensing volume. This fraction is always less than unity; therefore, one should not expect to find an optimized nanofeature geometry with a dramatic increase in sensitivity at a given wavelength. All theoretical results are supported by finite-difference time-domain calculations for gold nanoparticles of different geometries (rings, split rings, paired rings, and ring sandwiches). Numerical sensitivity calculations based on the shift of the extinction peak are in good agreement with values estimated by perturbation theory. Numerical analysis shows that, for thin (≤10 nm) analyte layers, sensitivity of the LSPR is comparable with a traditional surface plasmon resonance sensor and LSPR has the potential to be significantly less sensitive to temperature fluctuations. 相似文献
36.
Boris P. Tarasov Mikhail S. Bocharnikov Yurii B. Yanenko Pavel V. Fursikov Mykhaylo V. Lototskyy 《International Journal of Hydrogen Energy》2018,43(9):4415-4427
This work presents results of the experimental studies (XRD, SEM, PCT) of hydride forming intermetallides used in the first (LaNi5) and the second (La0.5Ce0.5Ni5) stages of industrial-scale metal hydride hydrogen compressor providing H2 compression from 3.5 to 150 atm with the productivity about 10 Nm3/h. During the operation, both materials underwent 18,180 hydrogenation/dehydrogenation (h/d) cycles which included H2 absorption at the pressure of 3.5 atm (LaNi5) and 35–38 atm (La0.5Ce0.5Ni5) at T = 15–20 °C followed by H2 desorption at the pressure of 35–38 atm (LaNi5) and 150 atm (La0.5Ce0.5Ni5) at T = 150–160 °C. It was found that the observed ~30% drop of the productivity of the compressor by the end of its operation is associated with a degradation of the first stage hydride material (LaNi5) under conditions specified above. The cycling resulted in the appearance of Ni and LaH2+x phases in addition to the parent intermetallide. In turn, the cycled LaNi5 exhibited more than 20% lower hydrogen storage capacity than the alloy at the beginning of the cycling; the cycling was also found to result in a noticeable sloping of initially flat plateau. Conversely, the degradation effects in La0.5Ce0.5Ni5 were found to be much less pronounced, in spite of the higher operating H2 pressures. The observed effect was associated with the decrease of thermodynamic driving force (TDF) of AB5 disproportionation in H2 when substituting La with Ce. 相似文献
37.
ABSTRACT: Massless Dirac electrons in graphene fill Landau levels with energies scaled as square roots of their numbers. Coulomb interaction between electrons leads to mixing of different Landau levels. The relative strength of this interaction depends only on dielectric susceptibility of surrounding medium and can be large in suspended graphene. We consider influence of Landau level mixing on the properties of magnetoexcitons and magnetoplasmons-elementary electron-hole excitations in graphene in quantizing magnetic field. We show that, at small enough background dielectric screening, the mixing leads to very essential change of magnetoexciton and magnetoplasmon dispersion laws in comparison with the lowest Landau level approximation.PACS: 73.22.Pr; 71.35.Ji; 73.43.Mp; 71.70.Gm. 相似文献
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Experimental data on the bulk modulus of elasticity, thermal expansion coefficient, specific heat capacity, specific volume, Grueneisen constant, and atomization energy of the cubic monoxides of Mg, Ca, Sr, Cd, Ba, Eu, Th, U, Pu, Ti, Zr, V, Nb, Ta, Cr, Mn, Fe, Co, and Ni were analyzed. Using six correlation relationships values of unknown properties and adjusted values of known properties at 298 K were calculated.
相似文献40.
Yvonne Williams Alyona Sukhanova Małgorzata Nowostawska Anthony M. Davies Siobhan Mitchell Vladimir Oleinikov Yurii Gun'ko Igor Nabiev Dermot Kelleher Yuri Volkov 《Small (Weinheim an der Bergstrasse, Germany)》2009,5(22):2581-2588
The compartmentalization of size‐tuned luminescent semiconductor nanocrystal quantum dots (QDs) in four distinctive cell lines, which would be representative of the most likely environmental exposure routes to nanoparticles in humans, is studied. The cells are fixed and permeabilized prior to the addition of the QDs, thus eliminating any cell‐membrane‐associated effects due to active QD uptake mechanisms or to specificity of signaling routes in different cell types, but leaving intact the putative physical subcellular barriers. All quantitative assays are performed using a high content analysis (HCA) platform, thereby obtaining robust data on large cell populations. While smaller QDs 2.1 nm in diameter enter the nuclei and localize to the nucleoli in all cell types, the rate and dynamics of their passage vary depending on the cell origin. As the QD size is increased to 4.4 nm, penetration into the cell is reduced but each cell line displays its own cutoff size thresholds reflecting cell‐type‐determined cytoplasmic and nuclear pore penetration specificity. These results give rise to important considerations regarding the differential compartmentalization and susceptibility of organs, tissues, and cells to nanoparticles, and may be of prime importance for biomedical imaging and drug‐delivery research employing nanoparticle‐based probes and systems. 相似文献