Advanced Materials Research Vols. 129-131

Abstract: The green SiC (silicon carbide) powder, cutting fluid and pure Si (silicon) has the great recovery value in cutting waste mortar of solar silicon wafer. Nowadays, the critical technology of recycling SiC powder is classification technology in which the quality of recovery SiC powder is depended on classification precision. The self developed turbine air classifier (LNC-120A-2 type with two air classifier connected) was used in this experiment. The test dust is dry admixture of waste mortar containing SiC (JIS1200＃) through pretreatment. Through the orthogonal experiment, the optimum classification condition: the speed of first stage classifier is 1914rpm, the speed of second stage classifier is 3480rpm , the secondary air flow of second stage classifier is 13m3/h, the disperse pressure is 0.2MPa and the total system air volume is 1400m3/h. Under this condition, the classification precision of SiC powder is 85.73%, the particle size d50 is 9.571μm meeting the demand of JIS1200＃, the recovery efficiency is 89.2% and yield is 65Kg/h. Sometimes, the results show: the granule morphology of recovery SiC powder is basically some with standard SiC powder of JIS1200＃, meeting the effective cutting for silicon wafer.

Abstract: In this paper, a series of hydrogen storage Co-free AB3-type alloys were directly synthesized with vacuum mid-frequency melting method, and melted alloys were treated by low temperature-short time heat annealing. XRD results indicate that the main phase of melted La0.7Mg0.3Ni3-xFex (x=0.0~0.4) alloys are LaMg2Ni9 and LaNi5 phase. After heat treatment, some LaMg2Ni9 phase transferred into LaNi3 phase because of the loss of Mg during the heat proceeding. The content of Fe element affects phase structure of alloys and led to different electrochemical properties. Heat treatment has positive effects on cycle stability of La0.7Mg0.3Ni3-xFex (x=0.0~0.4) alloys but could cause little reduction of discharge capacity of Fe substituted alloy. However, the discharge capacity of La0.7Mg0.3Ni2.8Fe0.2 alloy increased after heat treatment. The EIS results show that heat treatment has positive effect on H transfer within alloy, and Fe content is related to the diffusion coefficient of H atoms within alloys.

Abstract: Eucalyptus camaldulensis biomass has been widely used in fiber and pulp. However, this would result in serious water pollution and meanwhile bring a great waste of biological resources. Therefore, the ether/acetone extractives of Eucalyptus camaldulensis biomass were identified by Py-GC/MS. The main 350°С pyrolysis components were 7-Oxabicyclo[3.3.1]non- 2-ene,8-(4-methoxyphenyl)- 2,4,9-trimethyl- (7.1%), Indolo[2,3-b]quinoxaline, 1-fluoro(4.23%), etc. The main 550°С pyrolysis components were 7-Oxabicyclo[3.3.1]non-2-ene,8-(4-methoxyphenyl)- 2,4,9-trimethyl-(7.1%), Indolo[2,3-b]quinoxaline, 1-fluoro(4.23%), etc. And the main 750°С pyrolysis components were oleic acid(6.77%), 10,18-bisnorabieta-5,7,9(10),11,13 -pentaene(2.33%), 9,12-hexadecadienoic acid, methyl ester(2.12%), etc. So the ether/acetone extractives of Eucalyptus camaldulensis could be used as biomedicine.

Abstract: Mechanical properties of ductile iron casting are strongly inclined with metal matrix microstructure, graphite elements presence and impurities rate. Increasing in the number of graphite elements near to sphere shape (nodule), more superior mechanical properties will be realized. Automotive castings normally produced in mass production due to high demand; vertical moulding configuration is one of the best options for producing mass quantity automotive castings. This study aim to discover either the vertical moulding configuration will affects the nodularity properties distribution for different cavity position in the mold. In this study, ductile iron disc brake castings have been produced by in-mold Mg treatment using vertical parted molding method. Samples from different cavity position were taken and analyzed their nodularity distribution. Image processing computer procedure-Lieca was used to characterize the graphite morphology of the samples. The result shows that the different cavity position of vertical orientation disc brake casting produced dissimilar distribution of graphite. Higher position of cavity has higher nodule count and round graphite.

Abstract: More and more constructed wetland CW) were used to treat waste water in the world for its advantage on cheaper and efficiency. CW would clog for improper design or imperfect management, so application for it was limited. The purpose of this paper is that using backwashing method resolve filter media clogging problem which is an intractable matter in constructed wetlands project. The effects of the backwashing treatment on pollutant removal, as well as the influence on characteristics of hydraulics of wetlands, were studied. The experimental results indicate that CW hydraulic conductivity, hydraulic resistance time and removal rate of COD increased after backwashing. This paper confirmed that backwashing method can reverse clogging in vertical-flow constructed wetlands, and provided design guidance for applying backwashing method to treat clogging vertical-flow constructed wetlands.

Abstract: Solar ground-source heat pump (SGSHP) system is unsteady when used to heating. Latent heat storage tank (LHST) was used appropriately in which phase change material (PCM) - CaCl2•6H2O was encapsulated in plastic kegs setting on the serpentine coil. PCM which was as controlling unit of the phase change heat transfer model were solved numerically by an enthalpy-based finite differences method and was validated by experimental data. In order to reflect the effect of the system, two days were chosen to compare the numerical results with experimental data. Inlet and outlet temperature of the water in the LHST, temperature of PCM and storage & emission heat of LHST were measured. The trends of the variation of numerical results and experimental data were in close agreement. Numerical results can reflect the operation mode of the system very well.

Abstract: The mechanical model of the FRP Strengthened RC beam is studied in this paper. According to the static equivalence principle, the equivalence elastic modulus of the FRP strengthened RC beam simplified model is obtained; by using modal equivalence principle, the equivalence density of the model is also obtained. The result of virtual FRP strengthened RC beam shows that the method in this paper can be used widely with high accuracy.

Abstract: The study on the Anti-sliding attenuation law of the up-layer bituminous pavement is of great practical significance. Through analyzing the effect factors which affect the anti-sliding performance of the up-layer bituminous pavement, combining with the investigation data of on-the-spot traffic volume and the testing data of on-the-spot transverse force coefficient, aiming at "Super-12.5" up-layer bituminous pavement this paper established an attenuation model of the anti-sliding performance. Using which, we can forecast the change of anti-sliding performance and serve the construction and maintenance of bituminous pavement.

Abstract: After an extensive research on the fundamental theory, the theoretical basis for the gearing with equal conjugate curvature is presented in this paper. This includes the theory for gear meshing with high oder of contact. In comparison to previous studies, the theory of this paper is more restricted going beyond third order parameters into the fourth order, the teeth profile had one order of contact higher than that of the ordinary gearing. So that further improved the contact strength of tooth profile. A large category of gearings with high order of contact was presented. The rack-pinion gearing with equal conjugate curvature is one of them. In my gearing the curvature center of media rank extend along the pitch line continuously and steadily.

Abstract: An incident shock tube technique has been used to measure the ignition delay time for propylene oxide-oxygen-nitrogen mixtures in the temperature range of 900 to 1250K. Ignition delay times of CO*(460.3nm) and AlO (470.5nm) were measured using pressure sensors under series of shock strength. The ignition time of AlO was linearly decreased as the induced shock wave strength was increased. The spectral intensities of AlO under corresponding to shock wave strength were evaluated by intensity CCD(ICCD) spectral system triggered by optic signal.