Advanced Materials Research Vol. 507

Abstract: The current paper discusses the sources, formation and harm to the natural environment of human health of all kinds of pollution caused by the building materials in the building industry of our country. Besides, it analyses the relevant factors which cause the pollution of building materials. Finally, it proposes the way to make strategies and measures to handle the pollution caused by the building materials on the basis of the relevant regulations of Chinese building industry and the concrete national conditions.

Abstract: This paper summarizes the common categories of balls for leisure sports, and makes summative introduction and comment on the current situation of the most popular four kinds of ball sports equipments in China, proposes the performance index of the matrices of composite materials, expounds the trend of the material selection for ball sports equipments, and has a constructive and instructive significance to the further research on high-performance materials for balls.

Abstract: The main factor mathematical analysis is a method to reduce the many variables to a few variables and research the mutual relationship between them,so this paper is mainly put to use the main factor method to reduce the 18 index of internal structure performance,physical and mechanical performance and filtering performance of automobile engine oil filter materials to the four main important factors,which in turn is weight factor,filtering effect factor, permeability factor and pore factor.It can be used this four main factor to represent the characteristic of oil filter materials and reduce the repetition and trival of redundant index in the expression in the process of these eighteen factors,moreover,it will be more convenient and simple and provide a kind of thought and methods to research the property of automobile engine oil filter materials.

Abstract: With regard to the car engine oil filter materials,it is necessary to possess a certain fiber diameter to achieve a preferable porosity and filtration effect.According to the investigation of commonly used oil filter materials in the market,this thesis is firstly selected ten kinds of various automobile oil filter material and then tested their fiber diameter,the main results have the maximum fiber diameter,the minimum fiber diameter and the average fiber diameter,however,the three results are not certain of the relationship.So through the linear regression method to discuss the quantitative mathematical relationship among them and to estabilish a theoretical calculation formula to compute them.

Abstract: With density functional theory, the structural and electronic properties of Au3 and Au2M (M=Ag, Cu, Pd and Pt) clusters have been studied. The structural results indicate that by substituting one Au atom with M atom, the corresponding geometries are changed slightly. To investigate the electronic properties, bonding properties and highest occupied molecular orbital (HOMO) were observed. It is found that most trends in Au2Pd and Au2Pt are similar and it also happens in the other two doped clusters. In addition, the calculated mulliken overlap populations suggest that doping modify the localized electron between Au and Au atom. It is also found that the contributions from various atoms on HOMO and energies of HOMO are changed. These may make difference in the adsorption of clusters.

Abstract: The mercury porosimetry experiment has tested three different kinds of porosity graphite and the microscopic structure of impregnation antimony materials, and has calculated the corresponding fractal dimension by using the Menger model. The results show that: the main pore diameter of the graphite materials is in the interval of , most of which can be filled by impregnation antimony, and graphite and impregnation antimony materials both have the fractal characteristics. Graphite materials also have the dual fractal characteristics. Its fractal inflection point aperture is about 1μm, and the fractal dimension (3.05 ~ 3.25) of the small pores (φ≤1μm) is less than the one (3.71 ~ 3.95) of the large pores (φ>1μm). The reason why existing the dual fractal characteristics is that the size of the pore formation mechanism is different. Impregnation occurs mainly in the range of large pores, characteristics of which is an important factor to influence the quality of impregnation materials. The material formula is the main factor to influence the large pores and an important guarantee to improve the quality of impregnation products.

Abstract: Simultaneous measurement of strain and temperature was demonstrated by using a long-period fiber grating inscribed on a polarization-maintaining fiber. This paper analyses the intersect senstive questions in terms of strain and temperature of fiber optic cable material. It also proposes a new way to carry out simultaneous measurements of strain and temperature. Experimental results show mean square deviations of 15.6 με and 0.7°C for strain and temperature, respectively.

Abstract: Acoustic wire plays the role of “bridge” in the signal transmission of acoustic system. The materials used for production of acoustic wire have their own features. They have different advantages to music playback. The functions and materials of acoustic wire reflect that different materials have different music playbacks. Lenitive sound mainly comes from the acoustic copper wire covered by silver outside. The wire covered by silver outside makes neutral sound, and the wire made from copper and silver also makes this kind of sound. The wire made form pure copper basically makes thick sound. Acoustic wire should match with each other properly, which can reproduce music attraction.

Abstract: Hydrogenated amorphous carbon (a-C:H) films on silicon wafers were prepared by middle frequency pulsed unbalanced magnetron sputtering technique (MFPUMST) at different substrate bias under the methane-argon mixed gases. Raman spectra show that the sp3 fraction in a-C:H films increases with increasing substrate bias voltage from 0 to 100 V, and then decreases when the substrate bias above 100 V. Nano-hardness for these films prepared under different substrate bias voltage show that nano-hardness increase with increasing substrate bias voltage from 0 to 100 V, and then decrease from 100 up to 200 V. The results above indicate that the sp3 fraction in the prepared a-C:H films is directly related to nano-hardness, therefore, substrate bias voltage is an important factor for influence on the bonding configuration of the deposited a-C:H films. The related mechanism is discussed by sub-plantation model in this paper.