Papers by Keyword: Support

Abstract: The modification of titanium dioxide (TiO₂) with zirconium dioxide (ZrO₂) supported by chitosan (CS) was carried out to obtain a binary oxide system, which should have the properties of both components such as high stability, solar propulsion, non-toxicity and good corrosion resistance. The sample with a ratio of 1:1:3 (TiO₂:CS:ZrO₂) showed the best results with a photocatalytic degradability of 99 % after 90 minutes at a pH of 7 and in 10 ppm Malachite Green (MG). Under visible light, the photocatalytic degradability of the CS/TiO₂-ZrO₂ hybrid was more than 90 %. The enhanced photocatalytic degradation of MG by hybrid catalyst beads was attributed to the synergistic effect of hybrid CS/TiO₂-ZrO₂.

Abstract: Many mural paintings stored in museums suffer from the heavy loaded added gypsum layers to the background. Currently anew way will be used for support the back ground of mural painting using the nanocalcium hydroxide which added to the background of it. This nanomaterial is smoothly penetrate inside the mural painting structure then it combines with CO₂ producing CaCO₃ the original binder in all mural paintings especially fresco paintings, The mechanical characteristics were tested to determine the change in properties of the interior structure of the treated Coptic fresco painting

Abstract: The SiC ceramic membrane supports by using four different processes were prepared by extrusion molding process. Shape and distribution of pores in SiC ceramic membrane supports were observed by SEM, Meanwhile the O-ring strength was measured. By analyzing the relationship between pores’ shape, distribution and O-rings strength, the optimal data of apparent porosity and the optimal pores’ shape and distribution was obtained. By means ofusing similar particle sizes, particles modification, controlling drying rate of the green body and controlling the contents of glass phase in neck part between SiC particles formed at the high temperature, the SiC ceramic membrane supports with the O-ring strength greater than 20 MPa were prepared.

Abstract: This paper is focused on the numerical simulations of tensile behaviour and capacity of headed studs for concrete structures. 2D axi-symmetric numerical models of different head diameters and effective embedment depth were carried out. The distance of the support ring varied from the 0,0h_ef to 3,5h_ef from the edge of the head of the stud. It was found that the tensile capacity of the headed stud is increasing with the reduction of the resistance area by the support. The influence of the head size on the tensile capacity was also observed. The capacity increase depended on the size of resisting area of the anchor and therefore the relationship between the real resisting area and theoretical area was proposed.

Abstract: Different research institutes and companies are developing technical systems to support or assist people at work and in daily life. The technical systems can be used for a wide range of different applications. Moreover, the systems have different forms with respect to their application. This paper will analyse and classify different forms of such systems in a general manner. The classification procedure will be illustrated by exemplary solutions.

Abstract: Now the most pressing and to end unresolved question is the determination of the design parameters for the base in the conditions of formation of karst deformations. Foundation calculations made on the basis of forecasting karst manifestations sizes and the likelihood of their formation at the base of the designed construction. In paper presented the grillage calculation scheme. We calculated the grillage with four bays for four cases: excluding karst collapse, taking into account the collapse of a single support, taking into account the collapse under two not adjacent supports and taking into account the collapse at two adjacent supports. In paper presents the diagrams of bending moments and shear forces.

Abstract: Intermetallic (Cu-Sn) nanoparticles are synthesized through a borohydride reduction with NaBH4 in a mixture of aqueous solutions of CuCl2.2H2O and SnCl2.2H2O at mass ratio Cu:Sn = 3:2 applying a template technique with a support such as carbon foam. The ratio is chosen in accordance with the Cu-Sn binary system phase diagram. The reductive precipitation is carried out at room temperature and atmospheric pressure. Porous nanocomposites are obtained and studied by scanning and transmission electron microscopy (SEM/TEM), and X-ray diffraction (XRD) analysis. The electrochemical behavior of the synthesized Cu-Sn alloy and the C-based composites (С-foam/Cu-Sn alloy) as positive electrodes is also investigated in a Li-ion battery) using a computer controlled laboratory cycling equipment BA500 Series Battery Analyzer.

Abstract: The Al₂O₃/SiO₂ materials prepared by impregnation of mesoporous silica with water solution of Al(NO₃)₃·9H₂O were suggested to be used as supports for catalyst of high-temperature catalytic reactions. It was shown that the distribution of Al₂O₃ component inside wide pores of silica (10-50 nm) occurs with the formation of Al₂O₃ layer in case of low loading and porous layer or particles, if Al₂O₃ loading increases. Thus, materials with bimodal pore size distribution were obtained. The Cr-containing catalysts were prepared on the basis of these supports and tested in the process of isobutane dehydrogenation at 540 °C. It was observed that the activity of the obtained Cr/Al₂O₃/SiO₂ materials was comparable with the one for Cr/Al₂O₃ catalyst. Thus, the suggested Al₂O₃/SiO₂ materials with unique porous structure are promising to be used as supports for catalysts for high-temperature reactions.

Abstract: Three kinds of functionalized imidazolium ionic liquid, 1-chloride (2-hydroxyethyl) -3-methyl imidazole ionic liquid [HeMIM]Cl, 1-bromide ethylamine-3-methyl imidazolium ionic liquid [AeMIM]Br and chlorinated 1-carboxyethyl-3-methyl imidazolium ionic liquid [CeMIM]Cl, were synthesized firstly. Subsequently, three kinds of supported silicon imidazolium ionic liquids were prepared from above ionic liquids with tetraethoxysilane by sol-gel method. The Chemical structure and crystal structure of the supported on silica based ionic liquids were analyzed by FTIR and XRD.

Abstract: The boundary magnification phenomenon was achieved in the coal mile surrounding rock, the displacement of surrounding rock was gradually increased, then more gentle in the plastic zone and sharply increase in the broken zone. The overall process of the displacement of surrounding rock exhibited graded changing trend; when the impact came, the broken zone had connected fissures caused by stretch of waves. It eventually increased the degree of damage in the boundaries of the broken zone and roadway. Accordingly, roadway support parameters were adjusted appropriately. From the energy point of view, the length of the anchor bolt was extended properly and that of the anchor cable was reduced properly. The adjusted length of the anchor bolt and cable well matched the size of the broken zone and plastic zone in roadway on site. There was a very good support effect. Anchor production process was also considered to improve gradient strength of materials which can better adapt to the rock burst environment.