Advanced Materials Research Vols. 712-715

Abstract: HOVF technology preparation of tungsten carbide coating, can be obtained the microhardness and neutral salt spray corrosion resistance superior to the protective layer of hard chrome plating, its own good toughness and high bonding strength of the matrix, itideal replacement for hard chrome plating technology

Abstract: The aim of this paper is to present a method to predict the leakage of the seal dynamically. The surface of the seal in the sealing area is modeled based on fractal theory. In order to simulate the change of the surface topography during the working process, a meso-scale contact model is set up. The simulation is accomplished with the distinct element software, PFC2D. This will be helpful to predict the lifetime of O-ring in mechanical application.

Abstract: An Al coating and black passive film technique was developed in this research. Meanwhile, a fine and uniform Al coating with good binding force on steel surface was prepared. And a black passive film was used as a post-treated film of the electroplated Al coating. The result proves that the corrosion resistance of electroplated Al coating was over one time higher than that of zinc coating by black passivation. Besides, Al coating was less brittle with good ductility and, it could be used as a pretreatment layer before conducting laser heat treatment to significantly improve the efficiency of laser heat treatment.

Abstract: The basic study on activity of polyphenol oxidase (PPO) from purple sweet potato (PSP) and its control method was mainly carried out by spectrophotometry. The PPO activity and browning degree (BD) of PSP peel were higher than those of inner-tissue and intact sweet potatoes. The relativity between them was positive, and relativity coefficient was 0.9895. The activity of PPO extracted from sliced PSP increased initially and decreased afterwards, with the highest activity of PPO on the third day during storage. And BD increased very quickly as time went by, especially in the first three days. The relativity between PPO activity and BD was negative, and relativity coefficient was-0.8747. The result indicated that the browning of fresh-cut PSP slices during storage was mainly due to PPO in it. The composite inhibitor was optimized by the orthogonal design, and the addition of 0.05% L-cysteine+0.03% phytic acid+0.3% ascorbic acid+0.3% citric acid would markedly inhibit the enzymatic browning caused by PPO and improve the quality of fresh-cut PSP slices.

Abstract: Sol-gel method and freeze-drying method were adopted to prepare the porous HAPw/KGM composite bone scaffolds and ammonia was used as a crosslinking agent. The porosity, average pore diameter, compressive strength and degradation rate in vitro were measured according to the related standard. The curves of each factor and lever affecting comprehensive properties were drew through the orthogonal design L9 (3⁴) experiment. SEM and XRD were applied in characterization. The results show that the optimal preparation program of the composite scaffolds is KGM (2g), HAPw (4.5g), ammonia (0.1 ml) and the freeze temperature (-20 ° C); the prepared scaffolds are porous three-dimensional network structures; the porosity of optimal scaffold is more than 90%; the average pore diameter is between 200-300μm; the compressive strength is about 0.8Mpa and the degradation rate is about 50% within 9 weeks.

Abstract: Through the analysis and study the properties, characteristics and present conditions of the flue slime of blast furnace dust, a suggestion was made of recovering carbon and iron concentrate from the blast furnace dust using a beneficiation technology consisting of gravity separation-flotation. The laboratory test results indicated that it can obtain the iron/carbon concentrate with a grade of iron 53.41%, carbon 65.21% at a recovery rate of iron 51.33%, carbon 69.29%. This mineral processing technology achieved good technical and economical results, reaching the expected effect. The technology can be applied in production and popularized.

Abstract: In the present study the Solanum tuberosum, was used as the raw material to further exploitation and utilization and carry out the intensive processing of it. After cleaning and grinding into sauce and mixing with the supplementary material , and sterilizing the Solanum tuberosum jam was bottled and the nutritional of the ingredient of the jam was analysised by chemical and instrumental method. The results indicated that the Solanum tuberosum jam's color was bright and light red brown. Its flavor was tasty and the nutrition was rich. The protein content was 26.0mg g-1, including 18 kinds of amino acids and 8 kinds of essential amino acids needed by the human body. The fat was 3.0 mg g-1, as well as the rich mineral substances and the vitamin. For example Vitamin C content is the highest: 212.0 ×10-3mg g-1, The calcium content is as high as 24.3×10-2mg g-1. The Solanum tuberosum jam was one of the nutritional condiments for the old and the young. This study provided a theoretical and practical foundation for further exploitation and utilization of the Solanum tuberosum.

Abstract: In recent years, the use of liquid biofuels in the transport sector has shown rapid global growth, driven mostly by policies focused on achievement of energy security, and mitigation of GHG emissions. Microalgae, as biomass, are a potential source of renewable energy, and they can be converted into energy such as biofuel oil and gas.In this paper, the microalgae strain of Chlorella sp. was supplied in BG11 medium, and Cultivation optimization were experimented. The results were showed that temperature was an important factor which could influence growth and accumulation of secondary metabolite in the cell from accumulation process of biological products, temperature which was suitable for the growth of chlorella was 25°C.

Abstract: It detected the canopy temperature of rice via automated infrared imaging technology in the test under different irrigation condition, and used the CWSI theoretical model to diagnose whether the crop suffered water stress or not. It also analyzed the water stress index theoretical model of crop and other indexes on reflecting the water status of crop, including the relationship between the CWSI and leaf stomatal resistance, the CWSI and leaf net photosynthetic rate, and the CWSI and the soil moisture content. The results showed that the relations between the surface theoretical model and the above indexes were fine. It meant the CWSI well reflected the features of water stress of rice.

Abstract: In order to reduce the postoperative inflammation by the slow release of drugs at the beginning of implanting, drug-loaded apatite coatings and chitosan-apatite composite coatings on the NiTi alloy surface were prepared in the Simulated Body Fluid concentrated by five (5×SBF) under constant bubbling of carbon dioxide gas by biomimetic synthesis method. The composition and surface morphology of the coatings were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Additionally, a bacterial inhibition test was conducted for evaluating the drug slow release effects from the drug-loaded coatings. The results indicated that the porous apatite coatings with the flake structure could be deposited using the 5 times Simulated Body Fluid, and the drug-loaded chitosan-apatite composite coatings with better drug slow release effect were obtained. The incorporation of chitosan into the coatings could effectively control the drug release rate and was favorable for achieving better drug slow release effects.