Advanced Materials Research Vols. 129-131

Abstract: In this paper, the poplar LVL was reinforced with monolayer fiberglass mesh. The reinforcing effect of lay angle between the weft of fiberglass mesh and the veneer grain was studied. And three different nondestructive testing (NDT) methods, such as the longitudinal transmission method, longitudinal vibration method and flexural vibration method (out-plane and in-plane), were used to test the dynamic Young’s modulus of the reinforced poplar LVL. The correlativity was investigated between the dynamic Young’s modulus and the static MOE of the reinforced poplar LVL. The reinforcing effect was best when the lay angle of fiberglass mesh was 30°. And the flexural vibration method and longitudinal vibration method had better accuracy to estimate the static MOE.

Abstract: It is more difficult relatively of inflatable wing structure form-finding and molding. Baffles are the major control factors of wing aerodynamic shape maintaining. The article analyzes the limitations of span-wise baffles structure. Afterward, inflatable deformation of chord-wise baffles structure has been analyzed, applying finite element method, the lofting size of the baffles material has been calculated, and the inflatable wing molding technology has been identified according the principle of aerodynamic shape accuracy – the lightest weight.

Abstract: The moisture of the sand in concrete industry is important for concrete quality. There are some different methods to measure the moisture in the sand. The microwave sensors are commonly used. The mix design or batch size frequently changes in some case. The gray correlation theory of gray system theory was applied in slump evaluation where the gray correlation coefficient and gray distance measurement were made use of in calculation estimating slump or the moisture of the sand. Then, the gray confidence interval of estimated value of moisture of the sand was calculated based on gray confidence level.

Abstract: The 3D physical model with two different structure of the electrical water heater was built. The performance of water heater was studied by computer fluid dynamics simulation (CFD). The heater performance is characterized the discharge efficiency, extraction efficiency and fraction of heat recoverable. It was 73.7%, 45% and 49.8% respectively with conventional structure, and it was 81.1%, 54.1% and 59.6% respectively of improved structure with discharge rate was 5L/min when all initial hot water temperature was 90°C. The temperature distribution of different discharged stage was also disclosure. The water inner the water tank of improved structure has the better thermal stratification than traditional structure. It was also agreed with the water heat performance.

Abstract: The nature of interface plays a very important role in the properties of nanoparticle-reinforced polymer nanocomposites. Understanding the interfacial interactions is crucial in further development of such nanocomposites. In this work, density functional theory is used to examine the interfacial interactions in the clay-nylon 6 nanocomposites. In particular, comparison has been made the systems in the absence of surfactant and in the presence of surfactant. It is found that surfactant can enhance the interfacial interactions through the formation of hydrogen bonds with clay surface and nylon 6. The interaction energies among the different components are calculated for the systems with clay of different atomic substitution.

Abstract: In this paper, an adaptive particle swarm optimization algorithm based on cloud model (C-APSO) is proposed. In the suggested method, the velocities of the all particles are adjusted based on the strategy that a particle whose fitness value is nearer to the optimal particle will fly with smaller velocity. Considering the properties of randomness and stable tendency of a normal cloud model, a Y-conditional normal cloud generator is used to gain the inertial factors of the particles. The simulations of function optimization show that the proposed method has advantage of global convergence property and can effectively alleviate the problem of premature convergence.

Abstract: Heavy metal ions are increasingly being released into environment, leading to serious pollution and significant health problems to human being. To address the adverse effects posed by them, in the present study, a remediation method by magnetic nanoparticles was proposed. The magnetic particles were synthesized by a solvothermal process first. Then they were derivatized with dual functional moieties of amino- and mercapto- by reacting with aminopropyl-triethoxysilane and mercaptopropyl-triethoxysilane simultaneously. The prepared material was characterized by infrared spectrometry and elemental analysis. Both functional groups of amino- and mercapto- were present within the material. Since amino- and mercapto- have high affinity for heavy metal ions, the material can be used to retrieve these ions from water samples. Pb2+ and Mn2+ were used as model analytes to evaluate the effectiveness of the material. It is found that, after 60 min adsorption, the ions were almost total removed from the sample solution.

Abstract: Silicon is the most attractive anode candidate for lithium ion batteries for its high theoretical capacity. However, it is difficult to be applied as anode material of lithium ion batteries for its poor cyclability and high irreversible capacity caused by structure collapse during the course of lithium insertion-extraction. Considering finding an efficient way to alleviate the crystal transformation during lithium insertion, the silicon anode with the highest theoretical capacity of all know non-lithium substances, was discharged by controlling its insertion capacity. The phase transformation during lithium ion insertion into silicon was investigated in detail. The lithium-insertion phases produced by constant capacity processing consist of Li-Si binary crystals and amorphous host phase. A stable Li12Si7 phase was found under different discharge conditions. This Li-Si binary phase formed by constant capacity showed high structure-reversibility during lithium insertion-extraction. The enhanced cyclability of silicon anode during constant-capacity discharging benefits from the mixture phases of silicon amorphous and crystal Li-Si alloy.

Abstract: In the process of manufacturing the composite materials, some of the chemical components are difficult to combine with each other. Aiming at this problem, a new method and supporting equipment of manufacturing the composite powder materials is reported which can make any two (or more) kinds of components mixing in nano-scale. This method is derived from the vacuum co-depositing technology by two (or more) vaporization sources for vacuum film coating, and some of the structures in vacuum film coil coating machine are used for reference. The principle, structure, process and characteristics of this method are introduced in detail. The models for depositing rate calculation are built respectively for both the electric resistance evaporation sources and the magnetron sputtering targets. The mixing component uniformity in the depositing powder material is analyzed by calculation.

Abstract: Zn nanopaticles scaled between 30-100 nm was prepared by the roller vibration milling in dry mode at room temperature, and the hydrolyzed ZnO/Zn hybrid nanostructure was attained from hydrolyzation while Zn nanopaticles contacted with water vapour in normal atmospheric pressure. Energy dispersive spectrometer (EDS) showed that the hydrolyzed production was made up of Zn and ZnO, and Transmission Electron Microscope (TEM) images showed that the hydrolyzed ZnO/Zn hybrid nanostructure had great dispersivity featuring nano-rods intermixed with nano-flakes. It was proved to have great photocatalytic performance in methyl orange (MO) degradation. Using it as catalyst, exposed 10mg/L MO solution to a 20W UV source light with a distance of 40 cm, the degradation rate will reach to over 80% in 60 min.