Advanced Materials Research Vols. 403-408

Abstract: In this presented work, by the seepage experiment for three groups of shale ceramsite concrete with different mixing ratio, it produced its impermeability mark and analyzed how the three factors of pressure holding time, water cement ratio and ceramsite pre-wetting time to impact the penetration depth; also a three-layer neural network model was built up by collecting 20 groups of testing and experiment data of actual projects data of ceramsite concrete chloride penetrability, and performed the chloride experimental simulation and prediction with the model, got comparatively accurate predicted values of chloride permeability coefficient.The study results provide some reference for similar studies.

Abstract: In this paper, the effect of bond-anchoring factor on bond behavior between deformed bar and shale ceramic concrete was analyzed by four groups of pull-out tests with different anchorage length. And three reinforced concrete pull-out tests used for comparative analysis were prepared at the same time. We obtained a series of experimental data and based on these data .A more accurate formula was summed up. This formula has a high value in guiding the practical project to choose the anchorage length.

Abstract: In this study, a novel approach of using two different methods was investigated to prepare the CuI thin films. The CuI thin films in this research were prepared by spin coating method and by mister atomizer. Both methods used CuI powder as a precursor and acetonitrile as a solvent. The thickness of CuI films in this research range from nm – um thickness depending on the deposition technique. The 2 point probe I-V measurement was used to measure the electrical properties. The resistivity of about 10⁶ Ω cm-10¹ Ω cm was observed with CuI thin films using spin coating technique. Then, the surface morphology shows all the films exhibit a microsturucture CuI particles in a case of mister atomizer method. For optical measurement, the ultraviolet-visible- near infrared (UV-VIS-NIR) measurement (Perkin Elmer Lambda 750) was used. The optical band gap of about ±3.1 eV and ±2.9 eV were observed in those CuI films. These properties of different technique are applicable for application in electronic devices such as in solar cells.

Abstract: This paper presents a theoretical calculation of misfit dislocation and strain relaxation in compositionally step graded In_xGa _1-x N grown on GaN using the total dislocation energy at each interface. The results also compared with uniform layer of In _0.17 Ga _0.83 N and In _0.14 Ga _0.86 N grown differently on GaN. Due to having residual strain and a step increase in indium composition a lower misfit strain in upper layers and hence larger critical thickness at each interface has been reported. These effects significantly reduced the misfit dislocations from 2.6×10⁵ cm^-1 to 9.5×10⁴ cm^-1 in step graded In _0.14 Ga _0.86 N(500nm)/In _0.09 Ga _0.91 N(100nm)/In _0.05 Ga _0.95 N(100nm)/GaN layers instead of a uniform In _0.14 Ga _0.86 N(700nm)/GaN. A small residual strain of 0.0007 after 700 nm graded layer thickness has been reported with 87.04% strain relaxation.

Abstract: The objective of this paper is an analysis of a body in a compressible viscous flow using the finite element method. Generally, when the fluid flow is analyzed, an incompressible viscous flow is often applied. However fluids have compressibility in actual phenomena. Therefore, the compressibility should be concerned in Computational Fluid Dynamics [CFD]. In this study, two kind of equation is applied to basic equations. One is compressible Navier-stokes equation, the other is incompressible Navier-stokes equation considering density variation. These analysis results of both equations are compared.

Abstract: This paper presents a method to control a flow behavior using the first-order adjoint equation method. A flood causes large-scale and extensive damage to the human property. It is expected that the damage can be suppressed to minimum if the water level or velocity of the river can be controlled. Therefore, the optimal control of a water flow is carried out in this study. In the control theory, the performance function which is defined by the square sum of the discrepancy between the computed and the objective water elevation at the target points is used. The extended performance function is given by the performance function and the state equation. The first-order adjoint equation can be derived by the condition that the first variations of the extended performance function and constraint condition are zero. The gradient of the extended performance function is obtained by solving the first-order adjoint equation. As the minimization technique, the weighted gradient method is applied. The shallow water equation based on the water velocity and elevation is used as a state equation. As the spatial discretization, the stabilized bubble function is employed. As the temporal discretization, the Crank-Nicolson method is applied. In numerical studies, the optimal control of water elevation in the Ikari dam lake is carried out. In this research, the optimal water velocity sent by the pump to minimize the water rise in the Ikari dam lake is computed. The inflow boundary conditions are presupposed as sinusoidal wave water elevation. The results of optimal control is performed effectively.

Abstract: Every aspect of life changes day by day. The change does not always involve the evolution of its bigger parts but in its smallest constituents. Similarly the advancement in technology is possible by evolving its minute elements. Every colossal structure, having unique designs, depends only on its constituents to maintain its image. Nut-bolts are such prime ingredients of any construction industry from small scale to large scale as they have a pivotal role in the whole production mechanism. But they need to be replenished to make them stand any disaster. Galvanization is one of the replenishment ways in their production. The paper deals with a galvanizing industry designed automatic by virtue of PLC for faster and reliable production as well as keeping in mind the optimum energy consumption and environment friendly working atmosphere.

Abstract: In the article we selected polyethylene glycol(400), triethanolamine, silane coupling agent, chrome alum, glycerin as the main raw material, and systematic studied the chemical adsorption film technology on metal surface by using one step. Through the preliminary experiments, we optimized the optimum technological conditions. The trial results showed that the process and procedures to deal with were simply, and the tank liquor was stable. The chemical adsorption film accumulation was closely, and it had stable structure. It had a good anti-base metal corrosion, and significantly enhanced the adhesion of metal coatings.

Abstract: We studied the effect of geometry on single focusing of particles in the passive microfluidic channels. There is a quantitative analysis of focusing on non-axisymmetric straight channels with two different unique designs as well as curved channels having symmetrical and asymmetrical radius of curvatures in one turn. We found that there is a clear relationship in existence of single line focusing with the degree of non-symmetry in microchannels. One-degree of asymmetry in straight channels does not induce any formation of single focusing, but single line focusing is pronounced by two-degree of asymmetry in straight channels. On the other hand, single line focusing in the curved channels is enhanced with asymmetrical radius of curvatures in one turn. The single line focusing in curved channels is seen at Rep values higher than 1, which gives us better continuous and high-throughput performance. The position of single focused particles in the microchannels is found to be 50 m with respect to the channel wall in the asymmetrical curved microchannels.

Abstract: In this paper, according to the bonnet polishing technology, in order to get the change regularity of the bonnet’s deformation, the inflated deformation model of the bonnet, which is made all of rubber or made of rubber but with a nylon enhancement layer, is established and analyzed by using the FEA simulation. And then, by simulating the process of the bonnet polishing the plane wafer, it achieves the contact pressure curve which varies with the bonnet decrement. According to the Preston equation, k can be acquired through the experiment, v can be achieved through mathematical modeling, and p has been achieved in this paper. Thus, the removal function based on FEA will be acquired.