Advanced Materials Research Vols. 354-355

Abstract: With the amount of waste electrical and electronic products, environmental pollution becomes more and more serious. Therefore, how to recycle waste electrical and electronic equipments has attracted wide attention. By employing the experience of foreign countries in the recovery of waste electrical and electronic products for reference, the paper points out domestic practice in recycling of waste electrical and electronic equipments has a long way to go. In the following, the paper summarizes governing body for recovery of waste electrical and electronic equipments, comprising of stakeholders in charge of recycle bin, logistics side and supervision side. And then, the paper proposes the governance mechanism of recycling of waste electrical and electronic equipments through channel system, the cost mechanism, management system, and legal system. Finally, the paper summarizes the conclusions and looks forward to the future.

Abstract: In this paper, effect of top-layer thickness on thermal-shocking property of plasma-spraying DCL coating of Sm₂Zr₂O₇ and YSZ was studied by FEM. Results show that radial stresses decrease with time increasing, and their maximum values are increase with top-layer thickness increasing. They have similar distributions along horizontal distance which decrease gradually with increasing top-layer thickness. Radial stresses at YSZ layer/ bonding layer remians almost compressive stresses state which is helpful to increase bonding strength the TBCs. Axial stresses remians almost unvariable along horizontal distance in the range from 0mm to 15mm, they change abruptly from negtive stresses state to positive stresses state at edge of TBCs sample. Axial stresses also decrease gradually with increasing top-layer thickness.

Abstract: Catalytic combustion of hydrogen/air mixture inside micro-tube was numerically investigated with detailed gas phase and surface catalytic chemical reaction mechanisms. Combustion characteristics for different reaction models, the influence of wall thermal conductivity, inlet velocity, and tube diameter on surface catalytic combustion reaction were discussed. The Computational results indicate that the surface catalytic combustion restrains the gas phase combustion. The higher wall temperature gradient for low wall thermal conductivity will promote the gas phase combustion shift upstream and will result in a higher temperature distribution. The micro-tube can be divided into two regions. The upstream region is dominated by the surface catalytic reaction and the downstream region is dominated by the gas phase combustion. With increasing inlet velocity, the region dominated by surface catalytic reactions expanded downstream and finally occupied the whole tube. The temperature of the flame core decreases with the decrease of tube diameter. Decreasing the tube diameter will enhance the surface catalytic reactions. Some theoretical evidences are provided for the application of catalytic combustion to Micro-electromechanical System (MEMS) and the extension of the combustion limits.

Abstract: Sevag, trichloroacetic acid and combining Sevag and TCA were used to remove protein from Fucoidan. And the conditions of deproteinization and undeproteinization were discussed to find the influence on the decoloration in Fucoidan. The results showed that methods of combining Sevag and TCA were better than others. By handling Sevag twice, using 1.3 mL TCA every 10 mL polysaccharose solution, the deproteinization rate reached 78.68%, and the polysaccharose loss rate was 28.89%. The decolourization ratio of stock solution was 29.13%, meanwhile, that ratio of deproteinization solution highly was 85.17%.

Abstract: In this paper, the classical sewage sludge and coal co-combustion power generating system was optimized. The regenerative steam in the extraction turbine was partly used for the sludge drying. And then, the mathematics model was established based on the exergy theory. Several extraction points were compared to find out the most optimization parameters (drying efficiency of the dryer, pressure and tempreture). The result showed that, with different steam temperature and pressure at different extraction points, the influence to the system exergy efficiency caused by the percentage of moisture and drying efficiency was different. When the sludge moisture content went to about 35%, the generating capacity increment was moderating. After the calculation and comparison, the error between the calculation results of the mathematical optimization model and the classical thermodynamic method was very small. The calculation in mathematical optimization model based on exergy analysis was relatively simple, and analysis of the relationship between variables was easier.

Abstract: In restricted visibility, great risk of collision exists between vessels formed a "head-on situation" geometrically. Started with the estimation on this particular situation and based on the requirements in COLREGS and applications of good seamanship, this paper explored the proper avoidance methods. Combined with the practice work at sea, the author collected some data about this special situation. By analyzing these data, the author found some defects in the practice work and gave some reasonable suggestions.

Abstract: Basalt fiber is a kind of Environment-friendly inorganic fiber material. Compared with Carbon fibers, studied the influence on cement mortar compressive, flexural, anti-shrinkage properties between different content and lengths of basalt fiber. The results showed that mechanical properties of Basalt fibers cement mortar are better than that of Carbon fibers cement mortar at a certain content, It is well for basalt fibers as reinforcement of cement based materials. Basalt fibers reduce the fluidity of mortar and have a certain enhancement to cement mortar early strength, and short fiber is more obvious than long fiber mortar. Basalt fibers cement mortar improved anti-shrinkage of cement mortar between different age, but decreased it’s 28d strength

Abstract: Axial magnetohydrodynamic (MHD) flows for Oldroyd-B fluid are investigated between two cylinders. The motion of the fluid is produced by the two oscillating cylinders. The fractional calculus approach is introduced to establish the constitutive relationship of a viscolastic fluid. Velocity field and shear stress of the motion are determined in terms of Bessel function and generalized Mittag-Leffler function by using Laplace transform and Hankel transform. The influence of pertinent parameters on the flows is delineated and appropriate conclusions are drawn.

Abstract: Pulsating heat pipe (PHP) with distilled water and acetone as working fluids was experimentally investigated. It is found that the PHP required a certain range of heating power to be started, within which the time required to start the PHP became shorter when the heating power was higher. There was a certain incline angle which is 45°in this experiment to start the PHP more quickly than other angles performed. The minimum power to start the PHP became higher when the filling ratio was higher. Compared with distilled water, the PHP was more readily to be started with acetone as working fluid.

Abstract: Nonlinear methods can be used to identify inrush water rapidly. Yet to identify the mixture water must be combined with water chemistry analysis. Take 9 levels inrush water in Tangshan Mine as an example, according to routine water test data, nonlinear methods, including gray correlation analysis, stepwise distinguishing, neural network, were used to determine water supply quickly, and the results were compared. On the basis, the indicators of piper three-line graph, SI, PCO2 determine the composition of the mixed water and supply channels. The results showed that the main recharge sources of 9th levels inrush water are alluvial and Ordovician limestone water, and infiltrating surface water. Possible ways to supply water are the tectonic fracture, gob, leakage shaft, closed adverse drilling.