Materials Literature
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The current study discusses the structure, mechanical and transport properties of polyethylene-based materials into two parts. The first part deals with the migration and chemical depletion of active substance such as insecticides from moulded polyethylene sheets. Deltamethrin (DM) and synergist piperonyl butoxide (PB…
Background In recent years, much attention is paid to the protection of oil and gas pipelines from internal corrosion. One of the solution is to use the steel pipes with an inner polymeric protective coating and their fireless make up technology. This article provides a calculation of strength substantiation of mechan…
Spherical silver (Ag) nanoparticles, triangular Ag nanoprisms, and triangular gold (Au) nanoparticles were separately deposited on the Eu(TTFA)3-doped Su8 films. Compared with the fluorescence of films without nanoparticles, the fluorescence of the doped films was greatly enhanced by the two kinds of the Ag nanopartic…
In recent years, Er3+ doped CdF2-CdCl2-NaF-BaF2-BaCl2-ZnF2 (CNBZN) glass has become one of the new materials in the field of laser cooling of solids. In this paper, using the theory of laser output and standing wave resonance, intracavity-and extracavity-enhanced laser cooling of Er3+-doped CNBZN glass are theoretical…
The dynamics of a drop on a mesoscopic scale is investigated by using the many-body dissipative particle dynamic (MDPD) method. The formation of liquid-vapor coexistence interface in the MDPD system is explored. The simulations of the pressure inside/outside the drop and the surface tension are carried out, and it is…
The vibration spectra of complicated molecule are generally divided into group frequency and ridge frequency. The ridge frequency has a certain symmetry in the vibration spectra of some complicated molecules, such as the ridge frequency of malachite green isothiocyanate (MGITC) molecule which is a molecular probe and…
Kerr effect is defined as an electro-optical physical phenomenon, in which the testing laser can change its polarization state as passing through a Kerr medium stressed by applied field. In this work, an on-line measurement system based on Kerr effect is established to investigate the surface electric field of insulat…
The aim of this research is to investigate the effects of morphology including shape and size of dispersed phase on the properties of microporous films fabricated by biaxial stretching technique. The microporous films were prepared from the composites containing poly(lactic acid) (PLA) as a polymer matrix and poly(but…
The formation model of hydroxyl group in silica glass is studied by first-principles calculations combined with coupling plane wave pseudo-potential method. The electronic structures and optical properties of silica glass with and without hydroxyl group are systematically calculated, including electronic densities of…
Sixty years after Brown v. Board of Education and 40 years after Milliken v. Bradley, many consider these cases to be two of the most pivotal decisions related to education made by the U.S. Supreme Court during the 20th century.
Fabrication and application of nano-sized materials is an emerging research field in modern society because the nanomaterials, the small materials with at least one dimension in the range 1-100 nm, provide unique chemical, physical, and optical properties, which are different from their bulk-counterpart.From the early…
This paper discusses rubber nanocomposites prepared via melt blending and based on the following nanofillers: organically modified clays (OC), carbon nanotubes (CNT) and graphitic nanofillers made by few layers of graphene (nanoG). Attention is focussed on structure of nanofillers and nanocomposites, filler networking…
This paper compares the inhibition properties of aspartic and lactic acid salts with nitrite ions and their effect on critical chloride concentration. The tests were carried out on carbon steel specimens in saturated lime solutions with pH adjusted in the range 13 to 13.6. The critical chloride concentrations were est…
학위논문 (박사)-- 서울대학교 대학원 : 전기·컴퓨터공학부, 2014. 8. 홍용택.
International audience
Al-Cu-Ge alloy system, a typical ternary eutectic alloy system, has been used widely in the industries. Our research is helpful for better understanding its thermophysical properties and improving its structural performance. In this paper, the specific heat values and thermal expansion coefficients of Al55Cu10Ge35, Al…
The Er3+/Yb3+ codoped TiO2 films prepared by magnetron sputtering can emit the green light at 490 nm and the red light at 670 nm by using a 980 nm diode laser irradiation. The emission intensity of upconversion is influenced by ErxYb2-xTi2O7 crystal and concentration of Er3+/Yb3+. The experiment shows that an appropri…
For better understanding of the phenomenon of crack initiation and propagation in welded joints of A-387 Gr. 11 steel designed for high-temperature and high-pressure applications, it is necessary to determine the effect of the heterogeneity of microstructural and mechanical properties on fracture toughness and fatigue…
The analysis of the coil electromagnetic launchers. The mathematical modeling of a single stage of the electromagnetic accelerator. The influence of parameters of traction coils, the initial conditions and the particle material to the final speed.
It has been shown that both gravimetric method and electrochemical methods can be used to evaluate the effect of additives on the rate of corrosion. The results of determining the corrosion rate by the electrochemical method under dynamic conditions are in good agreement with the results of field tests.