Current Issue : January - March Volume : 2020 Issue Number : 1 Articles : 5 Articles
The effect of holmium addition to the Al-Si system has been experimentally\nstudied, as the isothermal section at 500 DegreeC. The constitution of the alloys has\nbeen determined by means of scanning electron microscopy (SEM), electron\nmicroprobe analysis (EDXS) and X-ray powder diffraction. The knowledge of\nthe phase relationships in the R-Al-Si ternary systems (R: rare earths element)\nis essential to deeply understand the technological properties of the Al-Si\nbased alloys, that are useful in different industrial fields. In the system investigated\nhave been identify nineteen ternary fields and twelve two phase fields.\nThree ternary compounds have been found in this ternary section:.............................
Zinc ions (Zn^2+), known to be a novel intracellular second messenger related\nto various biological functions, have been delivered inside cells. For the\nintracellular Zn^2+ delivery, Zn^2+ has been chelated to carboxymethyl poly(1-\nvinylimidazole) (CM-PVIm) by mixing zinc chloride (ZnCl2) or zinc acetate\n(Zn(OAc)2) with CM-PVIm. The resulting Zn^2+-chelated CM-PVIm, that is,\nZn^2+/CM-PVIm complex by mixing ZnCl2 exhibited smaller particle size below\n10 nm and possessed larger amount of Zn^2+ ions, as compared to the\nZn^2+/CM-PVIm by mixing Zn(OAc)2. The both Zn^2+/CM-PVIm complexes\nexhibited no significant cytotoxicity, leading to intracellular Zn^2+ delivery.\nThe Zn^2+/CM-PVIm by mixing ZnCl2 delivered larger amount of intracellular\nZn^2+ ions than that by mixing Zn(OAc)2. These results suggest that the optimal\nZn^2+/CM-PVIm complex is a useful tool for intracellular Zn^2+ delivery\nto control various biological functions....
Cadmium zinc telluride (CdZnTe) semiconductor has applications in the detection\nof X-rays and gamma-rays at room temperature without having to use\na cooling system. Chemical etching and chemo-mechanical polishing are\nprocesses used to smoothen CdZnTe wafer during detector device fabrication.\nThese processes reduce surface damages left after polishing the wafers.\nIn this paper, we compare the effects of etching and chemo-mechanical polishing\non CdZnTe nuclear detectors, using a solution of hydrogen bromide\nin hydrogen peroxide and ethylene glycol mixture. X-ray photoelectron spectroscopy\n(XPS) was used to monitor TeO2 on the wafer surfaces. Currentvoltage\nand detector-response measurements were made to study the electrical\nproperties and energy resolution. XPS results showed that the chemical\netching process resulted in the formation of more TeO2 on the detector surfaces\ncompared to chemo-mechanical polishing..........................
In view of the disadvantage that the mechanical properties of cement-based\ncomposites can be significantly reduced by incorporating waste rubber powder\nin situ , the surface modification methods of the original rubber powder by\ncoupling agent KH560, sodium hydroxide, polyvinyl alcohol (PVA), methyl\nhydroxyethyl cellulose ether (MHEC) and tetraethyl orthosilicate (TEOS) as\nprecursors were adopted respectively. The modification of waste rubber powder\nwas studied by Change rate of mortar strength of cement-based composite\nmortar mixed with waste rubber powder. The results show that the hybrid\nmodification method using tetraethyl orthosilicate as precursor has better effect.\nWhen 5 phr ethyl orthosilicate is added, the compressive strength and\nflexural strength of cement-based composite mortar can be increased by 31.7%\nand 28%. Scanning electron microscopy (SEM) results show that the surface\nof waste rubber powder with good modification effect has many protrusions\nand flake-like porous structures which are beneficial to its bonding with cement-\nbased materials....
One of the methods of influence on rheological properties of heavy high-viscosity crude\noils is ultrasonic treatment. Ultrasonic treatment allows reducing the viscosity of crude oil and,\ntherefore, reducing the costs of its production and transportation. In this paper, the influence\nof ultrasonic treatment on the rheological characteristics of crude oil (sample No. 1 API = 29.1,\nsample No. 2 API = 15.9) was investigated. An experimental method was developed. Experimental\nstudies were carried out using the Physica MCR 102 rheometer. The influence of the intensity\nand duration of ultrasonic treatment on the viscosity of the initial crude oils was studied for 24 h.\nIn addition, the rheological characteristics of the treated oil were investigated after its natural cooling\nto 293 K. The results are compared with similar results for thermal heating....
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