Applied Mechanics and Materials Vols. 71-78

Abstract: The palladium-based catalyst of 0.36wt%Pd/cordierite honeycomb ceramics (CHC) without alumina interlayer film was prepared via a new electroless plating method. The results of activity test for complete toluene oxidation showed that the prepared catalysts had good catalytic activity and temperature resistance. The total oxidation temperature (T₉₉) for toluene was at 230°C for the catalyst calcined at 500°C. The scanning electron microscopy (SEM) results indicated that the particles of palladium phases were small and well dispersed on the CHC substrate surface. And the X-ray photoelectron spectrum (XPS) further revealed that both PdO state and adsorbed oxygen species participated and played a more important role in toluene oxidation reaction.

Abstract: Put forward the understanding of ecological security of tourism should be closely integrated regional objects，Establish the concept of regional background feature has a decisive role in the various factors of assessment of tourism destination ecological security. The expression of tourism destination tourism ecological security is clarified. According to the current state of social, economic and tourism industry and the ecological environment background characteristics of the East Dongting Lake tourist destination, Diagnostic system of tourism destination ecological security. And make relatively accurate evaluation of the security state. Diagnosis of the East Dongting Lake tourist destination tourism ecological security is in a relatively secure state, at the same time should be brought to society, government, tourism industry of great concern.

Abstract: Comprehensive risk analysis mode including overtopping risk, slide instability risk and seepage risk has been established. Chaishanhu section of Lannihu polder which is a important polder of Dongting lake as an example, the result showed: overtopping risk rate is 0.23%, if consider the influence of wave run-up and wind increase-water-output, it will be 0.84%; Seepage risk rate is 1.22%, slide instability risk rate is 0.94%. Comprehensive risk rate, when not consider the effects of wave run-up and wind increase-water-output for 2.39%; If consider the impact, it is 3.00%.

Abstract: This article aims at exploring the influence of different water quality system to the scaling corrosion, which based on the mixed of circulating cooling water and reserved water in different proportion. Then the mixed water as new circulating cooling water conducts dynamic simulation experiment and rotating piece experiments and then adds with a certain volume of scale inhibitor. This article’s purpose still lies in obtaining the best water ratio through the scaling and corrosion inhibition’s performance of three kinds of water quality analysis.

Abstract: Fanger’s PMV is the most famous thermal sensation index but it is too complex to be applied in practice. Besides, the PMV index does not include the effect of horizontal solar radiation on the indoor thermal environment. In order to obtain simple and applicable correlations with consideration of solar radiation, a one-year measurement has been conducted in a naturally ventilated residential room in Qujing Normal University of Yunnan province, China. Based on collected data, PMV indices are calculated by using Newton’s iterative method. The relationships of the PMV and the environmental parameters — outdoor air temperature, indoor mean air temperature, mean radiant temperature, wind velocity, relative humidity, and hourly horizontal solar radiation — have been studied by the multivariable regression techniques. Large numbers of correlations with high correlativity have been developed in the present paper. It is convenient to use them to evaluate and predict the indoor thermal environment in the natural ventilation buildings.

Abstract: In order to improve electric efficiency of solar cell arrays and obtain available heat energy, the solar trough concentration photovoltaic/thermal system has been constructed and the experiment performance and analysis of solar cell arrays have been carried out. The results show that in concentration the thermal efficiency of system linearly decreases with the temperature of cell arrays increasing. In non-concentration, the maximum power output (P_m) temperature coefficients of single crystalline silicon solar cell, polycrystalline silicon cell array and super cell array are -0.2 W/(m²·°C), -0.15 W/(m²·°C) and -0.16 W/(m²·°C), respectively. In concentration, the P_m temperature coefficients are -11.8 W/(m²·°C), -5.9 W/(m²·°C) and -5.1 W/(m²·°C).

Abstract: Ambient air of Dalian was sampled with active high-volume air samplers in early spring time. The concentrations and the congeners between gas phase and particulate phase of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) in the air were measured. Samples analysis results showed that the concentration of PCDD/Fs in particulate phase was higher than that in gas phase. The ratio of PCDD to PCDF in gaseous phase and particulate phase was lower than 0.4. The main sources of atmospheric PCDD/Fs in Dalian early spring season were coal-related source. The total I-TEQ in gaseous phase and particulate phase was 30.3 and 143.6 fg m-3, respectively. The I-TEQ of Dalian early spring atmosphere was lower than international standard, the atmospheric quality in Dalian was better.

Abstract: This paper constructs three types of bioprosthetic valve leaflets’ parametric model via computer aided design, a series of accurate parameters of the bioproshtetic heart valve, such as radius of the sutural ring, height of the supporting stent and inclination of the supporting stent, are determined. Numerical simulation is used to determine the effect of different shape designs on the mechanical performance of the bioprosthetic valve leaflet. The dynamic behavior of the valve during diastolic phase is analyzed. The finite element analysis results show the stress distribution of the ellipsoidal and spherical valve leaflets are comparatively reasonable. The ellipsoidal and spherical valve leaflets have the following advantages over the cylindrical leaflet valve, lower peak von-Mises stress, smaller stress concentration area, and relatively uniform stress distribution. The ellipsoidal and spherical valve leaflets may contribute to the long term durability of the valve. This work is very helpful to manufacture valvular leaflets with reasonable shapes and to prolong the lifetime of the bioprosthetic heart valve.

Abstract: Treatment of printing and dyeing wastewater by the device of high gradient magnetic separation (HGMS) developed by author was tested. The results showed that printing and dyeing wastewater contained varied chemical composition and whose initial concentration of chromaticity and COD were 800 and 565mg/L respectively can be well cleaned by Fenton oxidation—magnetic seed coagulation—HGMS. The removal rate of chromaticity and COD was up to 92.6% and 79.5% respectively. The effluent can meet the national drainage criterion. The optimum technological parameters are as follows: pH=6, [FeSO₄·7H₂O]=250mg/L, [H₂O₂]=1.3ml/L, [PAM]=0.75 mg/L, dose of magnetic particle W=150mg/L,current intensity I=8A, current velocity U=2.420L/min, packing density of stainless steel wire R=1.00%-1.43%. Recovery rate of magnetic particle was up to 90% by regenerated technique of chemistry in combination with physics.

Abstract: In 2007, the political report of 17th conference of national delegate of Chinese Communist Party put forward that ecological civilization should be built in China. Ecological civilization brought out in the low development level of China is the strategy of Chinese development, and is an important part of Chinese modernity aim. The paper describes some important thoughts in foreign countries about the ecological civilization in history. Based on the comparative analysis of domestic and international ecological civilization, the paper brings out several suggestions on building ecological civilization in China.