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JETP Letters - We experimentally investigate longitudinal and transverse second-harmonic voltage response to ac electrical current for a magnetic Weyl semimetal Co3Sn2S2. In contrast to the... 相似文献
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V. M. Grachev V. I. Esin N. G. Polukhina S. G. Rassomakhin 《Bulletin of the Lebedev Physics Institute》2014,41(5):119-122
The problem of the creation of the needed technology allowing the effective development of corporate databases is considered. As a solution, we propose a new technology based on the “object-event” semantic model and the use of the universal data model, data model language, and special database software development tools. The principal features of the proposed technology and its advantages are considered. 相似文献
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M. M. Zverev V. O. Val’dner N. A. Gamov R. V. Esin S. I. Gronin E. V. Zhdanova S. V. Ivanov P. S. Kop’ev D. V. Peregoudov I. V. Sedova S. V. Sorokin V. B. Studionov 《Optics and Spectroscopy》2011,111(2):178-181
The fracture patterns of active elements of pulsed green lasers with transverse electron-beam pumping, based on ZnSe-containing quantum-size structures, have been investigated. The fracture in the form of thin (~1 μm) and long (to 100–150 μm) filaments can be explained by the self-focusing of the intrinsic laser radiation in the semiconductor structure. 相似文献
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Robert J. Bellair Mihai Manitiu Esin Gulari Rangaramanujam M. Kannan 《Journal of Polymer Science.Polymer Physics》2010,48(8):823-831
Superior property enhancements in polymer–clay nanocomposites can be achieved if one can significantly enhance the nanoclay dispersion and polymer–clay interactions. Recent studies have shown that nanoclays can be dispersed in polymers using supercritical carbon dioxide (scCO2). However, there is need for a better understanding of how changing the clay modifier affects the clay dispersability by scCO2 and the resultant nanocomposite rheology. To address this, the polystyrene (PS)/clay nanocomposites with “weak” interaction (Cloisite 93A clay) and “strong” interaction (Cloisite 15A clay) have been prepared using the supercritical CO2 method in the presence of a co‐solvent. Transmission electron microscopy images and small‐angle X‐ray diffraction illustrate that composites using 15A and 93A clays show similar magnitude of reduction in the average tactoid size, and dispersion upon processing with scCO2. When PS and the clays are coprocessed in scCO2, the “dispersion” of clays appears to be independent of modifier or polymer–clay interaction. However, the low‐frequency storage modulus in the scCO2‐processed 15A nanocomposites is two orders of magnitude higher than that of 93A nanocomposites. It is postulated that below percolation (solution blended composites), the strength of polymer–clay interaction is not a significant contributor to rheological enhancement. In the scCO2‐processed nanocomposites the enhanced dispersion passes the percolation threshold and the interactions dictate the reinforcement potential of the clay–polymer–clay network. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 823–831, 2010 相似文献
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Ömer Kesmez Nadir Kiraz Esin Burunkaya H. Erdem Çamurlu Meltem Asiltürk Ertuğrul Arpaç 《Journal of Sol-Gel Science and Technology》2010,56(2):167-176
SiO2 sols were prepared by hydrolysis and condensation reactions of tetraethyl orthosilicate through a one step acid or a two
step acid + base catalysis process, in the presence of nitric acid and four different base catalyzers, namely trimethylamine,
triethylamine, tripropylamine and tributylamine. Hydrolysis of TEOS was followed by FT-IR analyses. Particle size distributions
of the sols were evaluated after predetermined durations in 1–22 days. Particle growth was seen to be faster in amine catalyzed
systems than in one step acid catalyzed system. The highest rate of growth was in triethylamine catalyzed system. Glass substrates
were dip coated with the prepared SiO2 sols. Effect of sol aging duration on film thickness and on light transmittance properties of the films was investigated
with respect to type of base catalyst. Thicknesses of the films which were measured to be in the range of 100–400 nm, were
seen to increase with aging duration of the sols. Triethylamine catalyzed system presented the highest film thickness. Films
obtained from one step acid catalyzed system presented an increase of 4.8%; whereas acid + base catalyzed films provided an
increase in the light transmittance of 5.7% in the first 4 days of aging. Surfaces of films were examined by FESEM and AFM.
The antireflective character of the films was verified by diffuse reflectance analyses. 相似文献
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Mehmet?Gokhan?Caglayan Esin?Kasap Demet?Cetin Zekiye?Suludere Ugur?TamerEmail author 《Mikrochimica acta》2017,184(4):1059-1067
The authors report on a robust method for the synthesis of gold nanorods (AuNRs) with tunable dimensions and longitudinal surface plasmon resonance. The method relies on seed-mediated particle growth in the presence of benzalkonium chloride (BAC) in place of the widely used surfactant cetyltrimethyl ammonium bromide (CTAB). Uniform AuNRs were obtained by particle growth in solution, and BAC is found to stabilize the AuNRs for >1 year. The SERS activity of the resulting AuNRs is essentially identical to that of CTAB-protected nanorods. The SERS activity of the BAC protected nanorods was applied to the quantitative analysis of potato virus X (PVX). The calibration plot for PVX is linear in the 10 to 750 ng?mL?1 concentration range, and the detection limit is 2.2 ng?mL?1. 相似文献