Applied Mechanics and Materials Vol. 487

Abstract: The light inspection on surface finishing of most product measurement is an important feature in the industries. In this study, a lab module tester for examination on the different type quality of tissue paper quality was done. The light reflectance element was used in this study to differentiate the quality of tissue paper. The laser diode and photodiode was used as manipulator to differentiate the tissue paper and photo detector to detect the reflected light from the surface of tissue paper. The both of laser diode and photodiode were placed in a light box. Different level of intensity reflected from the surface material will have different voltage output. The result showed that the total ply high quality tissue paper has a higher reflected voltage output compared to low quality tissue paper.

Abstract: In this paper, a method of assay based on NMR (Nuclear Magnetic Resonance) measurements was developed. A protocol for the dissolution of gadolinium oxide cores and calibration curves were established for Nanoparticles gadolinium oxide. After optimization this method was used for several applications such as checking the concentration in colloids after dialysis or controlling the concentration and the form (oxides or free ions) of lanthanides after in vivo injection. The Experiments showed the samples did not present any suspension or deposit after the dissolution treatment, The concentrations calculated from relaxation measurements are very close to the concentrations measured . According to measure relaxation times T1 and T2, we can approximately determinate the gadolinium concentration. .

Abstract: Anti-mosquito nanocapsules were prepared using the copolymer of styrene (ST) and ethyl acrylate (EA) as wall and deet as core by micro-emulsion polymerization. The mean particle size of nanocapsules was about 424nm and the loading of deet was about 73% under the conditions of 2% SDS as emulsifier and the ratio of core/wall 1:1. Scanning electron microscopy and laser particle size analyzer were employed to characterize the nanocapsules.

Abstract: Using nonequilibrium Molecular Dynamics method, thermal properties of hexagonal 4H-SiC and 6H-SiC nanowires are investigated. The quantum errors between realistic temperatures and Molecular dynamics temperatures are rectified based on Density Functional Theory. Thermal conductivities of 4H-SiC and 6H-SiC nanowires are both simulated from 50K to 800K. The scale effect on the thermal conductivity of nanowire is also investigated by varying the nanowires length from 10nm to 130nm. Results indicate, if the length of phonon mean free path is shorter than that of nanowire, phonon-surface scattering will surpass boundary scattering to contribute thermal resistances. Therefore, the thermal conductivity of 4H-SiC or 6H-SiC nanowire is mainly determined by the comparability between the length of nanowires and phonon mean free path.

Abstract: Nowdays Barium strontium titanate (BST) can be applied into many fields of engineering. Its properties attracted more researchers to research and apply it into many fields of study. In this work, sol-gel method of preparing barium strontium titanate (BST) has been used. This work was done with 4 different ratio of x with 4 different deposition layers. The main purpose of this work is to investigate the relation between the ratio of barium (Ba) with different deposition layer and the surface of the substrate. Atomic force microscopy (AFM) was used in whole work to investigate the crystalline structure and surface roughness of the BST thin films.

Abstract: Normalizing is a kind of heat treatments, which have lower cost and higher efficiency. Through this process, the ship plate steel’s microstructure and performance can be promoted evidently. This article studies the effect of normalizing temperature on the microstructure and performance of controlled rolling and controlled cooling (TMCP) EH36 ship plate steel with the thickness of 15mm ,by mechanical properties text and optical microscopy. The results show that the comprehensive property of TMCP ship plate steel can be enhanced remarkably,although it’s hardness could be decrease,the plasticity of it can be improved obviously,especially the low temperature impact property. With the increasing of normalizing temperature,the grain grows,the impact property is decreased.

Abstract: The objective of this work is designed and fabricated a lab module tester to differentiate the different type of printing paper quality which available commercially was done. Laser light source was used to differentiate the quality of printing paper. The concept light reflectance on surface material was used in this study. The photodiode was used as photo detector to detect the reflected light from the surface of printing paper. The laser diode and photodiode were placed in a box which the box named light box. The laser was used to emit light on the sample and the photodiode detects light intensity from the surface printing paper in the light box. Different level of intensity will have different value of voltage output. The differentiation on the different type of printing paper including of 70 g/m2, 80 g/m2 and 100 g/m2 were done respectively. The result showed that the 100 g/m2 printing paper has a higher reflected voltage output compared to 80 g/m2 and 70 g/m2 printing paper.

Abstract: A series of acrylonitrile (AN)-methacrylate (MA)-dimethyl maleate (DMM) terpolymers with different molar ratios were fabricated by emulsion polymerization. The feeding ratio agrees well with the composition of AN-MA-DMM terpolymer. With increasing the molar ratio of DMM in terpolymer, glass transition temperature (T_g) increases to higher temperature at first and then decreases. T_g drops to the lowest value-78.6 °C when the feeding ratio is 85/13/2 mol%. The melting temperature (T_m) of 85/11/4 AN-MA-DMM terpolymer is the lowest at-137.2 °C, while its resistant temperature (5 wt% weight loss, T_0.05) rises up to the highest value, -314.9 °C. DMM plays an important role in improving the melt flowability of PAN based copolymer. The cross sections of 85/14/1 AN-MA-DMM fiber are compact and the outer surfaces of the fiber are smooth. Tensile strength of AN-MA-DMM fiber is 3.4 cN/dtex.

Abstract: Stainless steel pipe joint parts is the most important parts to join the stress pipeline. internal defects are more likely to occur when stainless steel joint part is produced by traditional casting method or welding forming method, while the upsetting extrusion proposed in this essay can not only meet the part quality requirements, but also save material and shorten processing cycle. By numerical simulation analysis about part upsetting extrusion forming process with the finite element analysis method, we can obtain many index numerical values in part forming process, and therefore provide reliable quantitative basis for optimum design.

Abstract: Hydroxyapatite is well used as bone repair materials. Degradation property and biological activity can be further improved by addition Zn into the HAP crystals. Zinc-doped hydroxyapatite whiskers with different content of Zn were prepared with calcium nitrate, Zinc nitrate and diammonium phosphate at the degree of 95°C. Zinc-doped hydroxyapatite whiskers were characterized by XRD, FT-IR, SEM and EDS. It was indicated that zinc can be doped in hydroxyapatite with proper process and zinc-doped hydroxyapatite whiskers were produced successfully.