Advanced Materials Research Vols. 183-185

Abstract: At present, only the temperature of external surface of the filament wound composite and the core mode can be detected in the curing process which is developed by experiencing many times, and the change of the internal parameters is not available. Based on the glass fiber pipe production line as the experimental platform, the paper suggests that the fiber grating sensors be embedded fiber composite materials at different levels when winding and the multipoint detection be performed in the internal curing process. The comparison analysis of the plotted curves for data collected from different points shows that the method is reliable to improve production efficiency and promote the automation of intelligent control.

Abstract: The spatial pattern of forest fire locations is of interest for fire occurrence prediction. A spatial statistical analysis of lightning-caused fires in the province of Heilongjiang, China, between 1973 and 1997, was carried out to investigate the spatial pattern of fires, the way they depart from randomness, and the scales at which spatial correlation occurs. Fire locations were found to be spatially clustered. The results also showed that there are some “hot-point” areas in DaXing’an Ling.

Abstract: Chemical mechanical planarization (CMP) of Cu pattern wafer based alkaline Cu slurry in GLSI was investigated. The performance of Cu removal rate and dishing condition were discussed in this paper. Different formation of alkali CMP slurry (Cu1 and Cu2 slurry) were observed by removal rate experiments and showed that alkaline slurry provided a robust polishing performance on initial removal rate, which Cu1 and Cu2 slurry were higher than that of commercial acidity slurry, and in addition, alkaline slurry also have good ending removal rate both in Cu1 and Cu2 slurry and favorable dishing in Cu2 slurry. Furthermore, the result indicated that Cu alkaline slurry with a complexing agent of R(NH2)n, compared with commercial acidity slurry with a inhibitor of Benzotriazol (BTA), have better application foreground for 45nm nod and more advanced nodes.

Abstract: This study preliminarily discussed a new method to identify the location and size of internal wood defects using experimental modal analysis (EMA) and artificial neural network. The different defect sizes and locations were simulated by removing mass from intact wood specimens. At room temperature in the laboratory, free vibration testing was conducted to generate the frequency response functions (FRF) of intact and defective Korean Pine (Pinus koraiensis) wood specimens using fast Fourier transform (FFT) analysis system. The first three orders intrinsic frequencies were captured by picking up the location of each order peak of FRF curves. Then, two identification indexes developed by previous research were constructed based on these intrinsic frequencies, and they were used as input parameters to build the networks for localization and size determination of wood defects respectively. These two artificial neural networks were trained and tested for wood defects recognition. The research results showed that: (1) the intrinsic frequencies of defective wood were lower than those of intact wood; and (2) the constructed two identification indexes were capable to effectively detect the location and size of wood defects, which were more sensitive to large size defects than small size defects.

Abstract: Along with the feature size reducing and the increase of integration level rapidly in ULSI，the request for metal impurities contamination on silicon substrate surface appears specially rigorous. In this paper the chelating agent was added in cleaning solution in order to removing copper ion. FA/O, a new kind of chelating agent was studied in RCA cleaning solutions, which has 13 chelating rings and is free of sodium, stable and easily soluble. The XPS and GFAAS measured results indicate that FA/O is more efficient than NH4OH as a ligand. Cu contaminations on silicon wafer can be removed remarkably when adding a little FA/O to the cleaning solution or polishing slurry. When the chelating agent concentration of cleaning solution is 0.1% the removal rate of Cu atom reaches 83 percent. The FA/O chelating agent substituting NH4OH in SC-1 may simplify cleaning steps, and one cleaning step can remove Cu pollution on silicon wafer surface and meet the requirements of microelectronics technology.

Abstract: In order to analyze the possibility of ultrasonic welding of wood-plastic composites, wood-flour(WF)/ polypropylene(PP) composite was ultrasonic welded, which contained 60%WF, 36%PP and 4% maleic anhydride grafted PP. The ultrasonic welding performance was evaluated by tensile tests and scanning electronic microscopy(SEM). The triangle energy direct stick was used in the ultrasonic welding. The results showed that WF/PP composite was successfully ultrasonic welded directly, while in the presence of energy direct stick, the strength of the welded joint was even better than the composite itself. It was concluded that the ultrasonic welding was suitable to WF/PP composites.

Abstract: Authors discussed the effect of organic and inorganic dyes on the properties of wood fiber/HDPE (WF/HDPE) composite. Iron oxide red, iron oxide yellow, iron blue, everbright fast red, permanent yellow, and phthalocyanine were used. Test results indicated that organic dyes provided brighter color and higher flexible properties to WF/HDPE composite than inorganic dyes. However, when exposed to UV weathering, WF/HDPE composites with inorganic dyes were more durability than those with organic dyes.

Abstract: Nanofluids are liquids containing nanoparticles, nanotube or nanowire suspensions. This work investigates the disinfection properties of ZnO nanofluids, especially the change of ZnO disinfection properties when facing different shaking speeds of incubator (50rpm, 100rpm, 200rpm and 300rpm). In this work, E. coli was used as model bacteria to test the disinfection property of ZnO nanofluids. Plant counting method was used to examine the number of bacteria before and after the treatment of ZnO nanofluids. The results demonstrate that both ZnO nanofluids sample A and B could inhibit or kill E. coli bacteria. ZnO sample B with smaller particle size showed better antimicrobial activities. Treated with higher concentration of ZnO sample B exhibited better antimicrobial activities. Besides, this work also demonstrated that with higher shaking speed of incubator, ZnO nanofluids showed better antimicrobial activities. The antimicrobial mechanism is thought to be associated with physical interaction between ZnO particles and the biological cells and enhanced mass transfer of possible chemical species produced due to the presence of ZnO particles.

Abstract: Using pot experiment, the total arsenic absorbed by Pteris vittata L.from gold roe collected from Guizhou Xingren gold mine was investigated. Arsenic extraction efficiency and effects by five kinds of chelants such as Ethylene diamine tetraacetic acid disodium salt (EDTA-Na2), citric acid (CA), ammonium dihydrogen phosphate (MAP), Sodium bisulfite (NaHSO3) and Sodium bicarbonate (NaHCO3) were assessed. Absorption of As was measured in the fronds and roots of Pteris vittata L.under pot trial condition in which the tested gold ore powder was leached by the above five chelants with the concentrations of 0, 0.05, 0.1 and 0.15 mol•L-1, respectively. The results show that most of the chosen chelants can largely improve the efficiency of arsenic absorption. The leaching efficiency of As in fronds was generally listed in the following order: MAP>EDTA-Na2>CA>NaHCO3>NaHSO3 under the average concentration．With the increase of chelant concentration the As was extracted more and more on MAP and NaHCO3 . The extracting content of As ranged from 5055ug/g to 5974ug/g for EDTA, from3273 ug/g to 4975 ug/g for CA, from 7482 ug/g to 9357 ug/g for MAP and from 3620 ug/g to 5284 ug/g for NaHSO3, from 3401 ug/g to 6378 ug/g for NaHCO3, respectively. The leaching efficiency of As in roots was generally listed in the following order: MAP> NaHCO3>NaHSO3>EDTA-Na2>CA under the average concentration．The extracting content of As ranged from 1862ug/g to 2627ug/g for EDTA, from1494 ug/g to 2347 ug/g for CA, from 2739 ug/g to 3896 ug/g for MAP and from 2064 ug/g to 3373 ug/g for NaHSO3, from 2316 ug/g to 2587 ug/g for NaHCO3, respectively. These results mentioned above show that available As in Guizhou xingren gold mine can be most leached by Pteris vittata L.with the above chelants, especially in MAP treatment. MAP was the best chelants among the four tested chelants, suggesting that it will be useful in chelant-induced phyto-remediation.

Abstract: To explore the dynamic impact fracture behavior of nanoparticle-reinforced composites, a bottom-up numerical method was proposed and verified through the fracture process simulation of nano-SiO2/epoxy sample in Charpy impact test. At the nano-scale, a parametric micromechanics model having interphase was built. And the effective material properties of the nanocomposites with variant volume fractions were obtained. Based on the homogenization theory, the macro-scale model of impact sample was established. It is demonstrated that this proposed bottom-up method can predict the locations and directions of cracks at macro-scale, and the growth process of rupture can also be visualized dynamically. The impact strength obtained from this method has a good agreement with the measuring results in literature. And this simulation method can also be used as an assistant tool for comparing the crack propagation rate of nanocomposites with variant particle contents.