Applied Mechanics and Materials Vols. 333-335

Abstract: With catechol as a substrate, some kinetic parameters, including Michaelis constant (K_m), maximum reaction velocity (V_max) and substrate inhibition constant (K_I) for the reaction catalyzed by polyphenol oxidase (PPO) from purple sweet potato (PSP) were mainly studied here by spectrophotometry. K_m and V_max were determined depending on bi-reciprocal diagram of Lineweaver-Burk and Hanes-Woolf diagram respectively, with K_m of 12.06 mM and V_max of 43.66 mM·min. The effects of four various inhibitors on PPO activity were different. Ascorbic acid (AA) and phytic acid (PA) showed strong inhibitory effects, with AA of the highest effect and citric acid (CA) the lowest. Among these inhibitors, AA was a reversible competitive inhibitor with K_I of 15.26 mM, which was significant and instructive to the quality and benefit improvement of processed PSP products.

Abstract: Deployable flexible displays attract a great attention recently. The flexible display used on electronic equipment have been developed, which can deploy to reveal a much larger screen or rolled up. However, one of major problems is its actuation of deployment and fixture. In this paper, a deployable display actuated by the SMP actuator is proposed. The shape memory polymer (SMP) actuator, which is considered to be attached to the back side of a flexible display, is used to deploy and fix the flexible display. A new method of laser-induced actuation of SMP actuator is investigated. By this method, the SMP can be induced by infrared light transmitted through a treated optical fiber embedded in the actuator.

Abstract: Base on the microscopic structure is characterized by anisotropy of microstructure that inherent in the process of saturated soft clay with sedimentary primary anisotropy or external force caused by induced anisotropy, biological changes along with the trend of the minimum potential energy. By studying the spindle rotation stress characteristics of the soil of the microscopic distribution, the pore characteristics of saturated clay sourced from microstructure pictures in Pearl River Delta region of south China is analyzed considering the microstructure in different stress conditions. Microstructure distribution of soft clay under conditions of section profiling variation including the anisotropy ratio law of pore characteristics are focused to study saturated clay. It is found that major-minor axis status induced the directional property of saturated soil in the process of consolidation by vacuum preloading. And porosity shapes factors which are small indicate directional property would be probability entropy which is able to calculating the chaos of overall arrangement, and it will be a lower value because of directional property. It is apparently inconsistent with the pore distribution of saturated clay which results from the cut section of different point of angle. And horizontal joint and large pore space constitute one of the saturated clay structure characteristic, which related to different pressures.

Abstract: This study focused on phenolic-resin/vitreous-silica-fiber (PR/VSF) ablation composites modified with silsesquioxane (SSO) and tetraethoxysilicate (TEOS). Three nanohybrids based on TEOS-SiO₂ (T-SiO₂), octamethyl-SSO (Me-SSO) and phenyl-SSO (Ph-SSO) were prepared and employed to modify the PR/VSF ablation materials, T-SiO₂/PR/VSF, Me-SSO /PR/VSF and Ph-SSO /PR/VSF. At a high temperature, the modified PR/VSiF coatings were melted under heats and then generated pre-ceramic bodies, avoiding damages from the heats for the parts of the body inside. To compare ablation properties of the three modifiers, the correlation of the material structures and ablation properties were discussed with ablation tests and morphology measured by SEM. As a result, the linear and the mass ablation of the three composites are in the order of T-SiO₂/PR/VSF > Me-SSO/PR/VSF > Ph-SSO/PR/VSF. Therefore, the properties of Ph-SSO show that it is suitable and more effective as a modifier for ablation materials. In the temprature of about 2000oC, the results of ablative coating basically reached the expected technical indix.

Abstract: Ethanol sensing performance of gas sensors made of Fe doped and Fe implanted nanostructured WO₃ thin films prepared by a thermal evaporation technique was investigated. Three different types of nanostructured thin films, namely, pure WO₃ thin films, iron-doped WO₃ thin films by co-evaporation and Fe-implanted WO₃ thin films have been synthesized. All the thin films have a film thickness of 300 nm. The physical, chemical and electronic properties of these films have been optimized by annealing heat treatment at 300oC and 400oC for 2 hours in air. Various analytical techniques were employed to characterize these films. Atomic Force Microscopy and Transmission Electron Microscopy revealed a very small grain size of the order 5-10 nm in as-deposited WO₃ films, and annealing at 300oC or 400oC did not result in any significant change in grain size. This study has demonstrated enhanced sensing properties of WO₃ thin film sensors towards ethanol at lower operating temperature, which was achieved by optimizing the physical, chemical and electronic properties of the WO₃ film through Fe doping and annealing.

Abstract: In order to control cutting depth of preheating ZrO₂ sintered ceramics accurately, linear expansion elongation of preheating ZrO₂ multiple phase is measured; on the base of the measured data a mathematical model of thermal expansion coefficient given at different preheating temperature is put forward. Its fitting-error from-9μm to +2μm is very small compared to the data of linear expansion elongation measured. Some milling experiments that cutting force is following preheating temperature have been done by the amending cutting-depth from the model. The experimental results show that the cutting performance of ZrO₂ sintered ceramics preheated not only turns better but also extends cutter life.

Abstract: The wastewater contained Cu²⁺ which the concentration ranged from 10 to 50 mg/L are used as the target, to investigated the influences of experiment conditions on the treatment efficiency by electrodialysis enrichment experiments, the authors designed the electrodialysis device, and copper sulfate solutions are used as the objectives. The experiments were investigated when the membrane adsorbed bubbles and removing bubbles, the results show that removing bubbles can improve the efficiency of the concentration and desalination. During the electrodialysis process, the intensity of light chamber has effects on the current intensity, the study in this paper proposed a optimization program for the existing electrodialysis devices.

Abstract: In this paper, we investigate the structural, electronic and elastic properties of rutile using the ultra-soft pseudo-potential scheme in the framework of density functional theory, together with the generalized gradient approximation. The calculated lattice constants and elastic constants are generally consistent with the other results. Our aim is twofold. First, density functional theory is a fine theory that can obtain reliable results. Second, rutile can be used in the modern industry, thus it should be carefully investigated. The elastic constants dependences on pressure are calculated. It is found that rutile is stable in the pressure range of 020Gpa. The anisotropy of this compound increases with applied pressure. Besides, the analysis of band structure is also given. The calculated band structure shows that rutile belongs to direct-forbidden-gap semiconductors.

Abstract: In order establish an efficient and environment-friendly process, crab flavoring were extracted from Chinese mitten crab (Eriocheir Sinensis) by-products using a selected enzyme formulation (including ratio of enzyme to material, pH and temperature). To the purpose, the extraction yield (Y) of amino acids was selected as the response variables. The model given through response surface methodology enables us to identify the optimum operating conditions (ratio of enzyme to material 1.7g/100g, pH 6.5 and temperature 65.3°C, respectively), under which it predicts a maximum response of extraction yield of amino acids 34.27μg/mg. Crab flavoring extraction is rich in sweet taste free amino acids by automatic amino acids analyzer. These results, suggests that the use of the flavourzyme treatment could extract crab flavorings out of crab by-products.

Abstract: Effect of welding heat input on the microstructure of the automatic ultra-narrow gap welded NK-HITEN610U2 steel heat affected zone (HAZ) was studied. Five heat input combinations (6kj/cm, 10kj/cm, 14kj/cm, 18kj/cm, 22kj/cm) were designated for the research. The weld joints made using these five combinations were subjected to micro-structural evaluations and hardness test for analyze the effect of the heat input on the microstructure. The results indicated that the width of heat affected zone increased with increase in the heat input.