Advanced Materials Research Vol. 530

Abstract: Based on the analysis of the properties of leaching residue of the gold flotation concentrate, through the application of newly-developed multi-layer automatic plain chute, it is possible to recover natural gold, pyrite and other metallic minerals from the leaching residue of flotation concentrate by using the gravity separation method, which enhanced the index of ore dressing recovery rate. Meanwhile, the secondary resources have been obtained comprehensive utilization.

Abstract: This paper investigates normal stress distribution of a single-lap adhesively bonded joint under tension using the three-dimensional finite element methods. Five layers of solid elements were used across the adhesive layer thickness in order to obtain an accurate indication of the variation of normal stress. All the numerical results obtained from the finite element analysis show that the spatial distribution of normal stress are similar for different interfaces though the stress values are obviously different. It can also be seen from the results that the left hand region, which is very close to the left free end of the adhesive layer, is subjected to very high stress and the magnitude of the normal stress oscillates in value close to the left end of the adhesive layer.

Abstract: The art is inextricably linked with the material and the process. The material is rapidly changing with the advancements of the modern technology, and it changes and refreshes people's views on the art. Many artists have realized that the material is not just a medium of artistic expression, but the language of the art. The modern art, not limited to the only way of presentation through the traditional material, conveys the artist's view of life and the world through the integrated use of materials combined with modern ideas and concepts, which has made the language of the material itself being cultivated and transformed. Hence the works of art are in great vitality through the release of the material's own natural force and creativity.

Abstract: Ba₂Ti₉O₂0 ceramics were prepared with different additives of B₂O₃ by liquid coating method and solid phase mix method. The sintering behavior, phase structure and dielectric properties of ceramics were investigated by X-ray diffraction, scanning electron microscopy and inductance-capacitance resistance analysis. The liquid coating method can reduce the amount of sintering aid and minimized the negative impact of sintering aid on dielectric properties. A ceramic composite which could be sintered well at 900°C for 3h and showed good dielectric properties of εr=42,tanδ=0.002 and TCF=-4ppm/°C（1MHz）was obtained when 1.0mol/l H₃BO₃ was added to the Ba₂Ti₉O₂₀ ceramic.

Abstract: Postponed-set mortar (PSM) is a new type material applied in prestressed concrete components. Successive coating a lay of PSM on prestressed strand is a key to engineering application. On the basis of experimental investigation, the model of PSM screw conveying is built by using the theories of rheology, and the flow for PSM in a single-screw coating machine is studied. The experimental results suggest that the Bingham plastic’s PSM can be conveyed by screw and coated on prestressed strand. It is achieved that PSM and polyethylene sheath is automatically and successively coated on prestressed strand only once by using the machine.

Abstract: This article introduces the materials and structure characteristics of the freezer inner shell parts. On the basis of the design specification, it focuses on the analysis and design of components of the vacuum forming die—the vacuum holes, core-pulling mechanism, patrix ontology and so on.

Abstract: The delamination and fibers pull out have been the main factors failure application of natural fibers in various engineering fields. To address these problems, particles reinforced composites are the promising candidate. The present paper investigates on vegetal particles (date palm seed particles/DPSp) and applies it as composites material reinforced unsaturated polyester (USP). The influence of alkali treatment on the surface morphology and structure of DPSp was investigated. They investigated by SEM and Energy Dispersive Spectroscopy (EDS) mapping. The water absorption results showed directly proportion with the particles loading as the relative increases were 0.645% and 7.345% for 10 wt% and 40 wt% of DPSp content, respectively. In addition, the water absorption ability of the composites showed low value comparing with many natural fibers. In addition, the fracture toughness of the composites was studied. Overall, addition of the proposed DPSp particles may be opens a new avenue to exploit the utilized natural cheap material to produce a green composite.

Abstract: The formation of organized nanocrystals that resemble tooth-like hydroxyapatite is crucial for successful enamel remineralization. Based on the principles of biomineralization , spindle - shaped hydroxyapatites (HA) were synthesized through biomimetic method with chitosan as template under a controllable way in vitro. We observed that hydroxyapatite nanorods can be controlled followed by in situ crosslinking process and triggered by conditions of pH and ionic strength. The dentinal tubule were blocked by neonatal hydroxyapatite layer and this composite a continuous structure of columns crystal with size of 10-40nm. At the same time, XRD showed that the precipitation was calcium fluoride phosphate and Ca:P was 1.6. Furthermore, there were column crystal with parallel direction inside, as same as the crystal array in the top of enamel rod. The results suggest that chitosan monolayer may be useful in the modulation of mineral behavior during in situ dental tissue engineering.

Abstract: Green chemistry approach (hydrothermal process) is utilized for grafting maleic anhydride (MA) into linear low density polyethylene (LLDPE), thereby enhancing the compatiblility of the latter in its blend with polylactic acid (PLA). The grafting of MA into LLDPE is confirmed by Fourier Transform-Infrared Spectroscopy (FT-IR) analysis. LLDPE-g-MA content in PLA matrix is varied as 4% wt., 8% wt. and 12% wt. when preparing glass fiber reinforced PLA/LLDPE-g-MA thermoplastic composite via hot pressing. Single Edge Notch Bend (SENB) specimens have been prepared from the composites and three point bend test was performed.The load-displacement plot of the test results indicates that the ductility index (DI) increased for the samples with increased LLDPE-g-MA content. The observation of the fractured surface of specimens in Scanning Electron Microscope (SEM) suggests that the improved DI value is because of the increased matrix ductility owing to the plasticizing effect of the LLDPE-g-MAH inclusion.