Search

A isoporous brominated poly (phenylene oxide) (BPPO) microfiltration membrane system, fabricated by figure breath method, was demonstrated for the effective removal of impurity from contaminated water. The water permeation flux of BPPO membrane is higher. Such ordered isoporous membranes can also be applied in other size-based separation systems, enabling new opportunities in bioseparation and biosensors.

The neutral silicone glass sealant was prepared and the mechanical performance of this silicone glass sealant was researched in this paper. The recipe of neutral silicone glass sealant was studied. Besides, the influence of different cross-linking agents was researched; meanwhile, the effect of plasticizer and reinforcing agent on the mechanical properties of the material was studied. To obtain the best properties of neutral silicone glass sealant, the recipe should be taken further efforts to optimize.

A microwave-induced catalytic removal device was designed and set up for studying removal of hazardous or toxic gas from contaminated air. Catalytic oxidative Removal ratios of several hazardous gases of VOCs, CO and H2under microwave field were tested. Results suggested that structure of hazardous gas and catalyst type were main factors affecting the removal efficiency of hazardous gas. Oxidative catalyst contributed to removal of reductive gas. In addition, the flow rate also affected the removal efficiency.

In recent years, with the aggravating of environmental pollution, the purification of carbon monoxide is currently a subject of interest. The catalytic oxidation method is an effective way. Manganese oxide nanoparticles were prepared by emulsion self-assembly method and then, synthetic and commercial manganese oxide-supported gold nanoparticle catalysts were successfully synthesized by the deposition-precipitation (DP) method. The catalysts were characterized by XRD, Raman, BET, ICP and HRTEM. The activity of the oxide and oxide-supported gold nanoparticle catalysts were evaluated on the fixed bed microreactor and Au/MnOx had the highest activity. The intrinsic activity of Au/MnOx at 35 °C is 0.81 molCO·mol-1Au·min-1. Compared with O2, CO concentration has bigger effect on the reaction activity.

Viscosity of Watered fuel oil, which was prepared by a self-made mechanical micro-mixing device, was measured with rotation viscosimeter. The effects of oil temperature, agitation speed and water content on viscosity were investigated in this research. The experimental results showed that: viscosity of watered fuel oil decreases with the increasing of oil temperature between 60-80 °C and water contents in 2.0-8.0 %, but increases with the accelerating agitation speed at 1000-1300 r/min.

The prevention and control of pollution is an important technical link in haploid breeding of wheat. From the pollution types,causes and prevention methods in the process of wheat anther culture to analyze how to reduce pollution problems appeared in the tissue culture,so as to achieve the purpose of decreasing the cost of wheat breeding,and improving the efficiency of breeding purposes.

This paper Based on the analysis of the characteristics of image information and image information technology, analyzes some field demand for image information technology, analyzed the image application of news communication management, Analysis of domestic and foreign research present situation, proposed to increase the image signal, research ideas application depth and the breadth of color and its technology in the field , to accelerate the process of social normalization.

the solid thin film lithium-ion battery integrated on chip was designed and analyzed based on solid lithium-ion battery structure, materials and microelectronics processing technology. The design model of the solid lithium-ion battery consists of Li negative electrode, Li3PO4 electrolyte and LiCoO2 positive electrode. The preparation process of the solid lithium-ion battery integrated on chip was researched, and the process consists of seven main steps. In addition, the characteristics of the design model of the solid lithium-ion battery were analyzed using COMSOL. The results show that the solid lithium-ion battery has small internal resistance and large discharge capacity. The discharge capacity of the solid lithium-ion battery under the discharge current of 25C reaches 75% of the discharge current of 1C.

This by ratiocinating the theoretical formations of the pressing time of Cylindrical fiberboard and analyzing the relationship between the pressing time and Temperature difference and wood-based radius.

In recent years, a large number of toxic and hazardous substances were discharged into environment because of the simple landfill and accumulation of vehivle dismantling waste. Therefore, it is very important to develop the recycling technology of vehivle dismantling waste for the harmless, stability, reduction and resource utilization of vehivle dismantling waste. In this paper, the compositions of vehicle dismantling waste from two different dismantling processes were investigated by manual sorting, infrared spectroscopy and X-ray fluorescence spectrometer, experimental results showed that the vehicle waste from manual dismantling contained more polyurethane, foamed plastic and rubber with low value and the size of waste is lager, the vehicle waste from mechanical dismantling contained more metal and brittle polymer and their size was smaller. The concentration of metal in two kinds of wastes are less than 1%, the total concentration of carbon and hydrogen reach about 70%, so vehicle dismantling waste was suital for recovering ernergy, but the pollution of chlrone from polyvinyl chloride need to be prevented.

The emulsion of chitosan in acetic acid aqueous and poly lactic acid in chloroform was spray-dried to obtain the chitosan/poly lactic acid microencapsules (CS-PLA). The polypyrrole / chitosan/ polylactic acid microencapsules were prepared by polymerization pyrrole on CS-PLA. The structures and the morphologies of microencapsules were characterized by FTIR, SEM, TGA and four probes technique. The results showed that multilayer polypyrrole were formation on the surface of CS-PLA microencapsules, the microencapsules had 3.0-8.0 μm diameters with smooth surface, and the electrical conductivity value was 1.03×10-3 S/cm.

Three oxidant decontaminants, including NaClO, H2O2 and an organic peroxyl acid, were introduced to destroy the cyanide ion. The residual cyanide ion concentrations in different decontamination water were detected by a cyanide ion selective meter. Before the detection process, the oxidants left in the cyanide decontamination water were pretreated by adding a certain amount of Na2SO3. Results showed that starch-iodide solution indicator method presented a perfect function on determining the dosage of Na2SO3. Values of the relative mean deviations on residual cyanide detection were below 5%. After the decontamination water was deoxidized by Na2SO3, whether the sample distillated or not could not affect the value of CN- quite much. Non-distillation was confirmed alternative in the detection of cyanide ion decontamination water. Too much standing time would lead to a relatively lower CN- concentration, especially in that of non-distillation.

Multi-component doped photopolymer with phenanthrenequinone photosensitizers is prepared and its photosensivity characteristic is investigated experimentally. SiO2 nanoparticles and ZnMA organometallic components are dispersed into the P(MMA-co-MAA) matrix to enhance the photosensitivity of sample. Experimental results indicate the photopolymerization time constants under consecutive exposure and the time constants of dark enhancement under darkness are evidently reduced at least one order of magnitude.

The heat treatment was carried out to modify the aramid fibers, and the effect of tension on the mechanical properties and structure was investigated through Fiber Strength Equipment, viscosity, XRD and SEM . The results show that fibers，strength slightly decrease, but modulus increase significantly according to the increasing of tension at 480°C and 10s, and reach a maximum when the tension value is 300 g. After heat treatment, molecular weight decrease and the degree of crystallinity increase. SEM show that there is little effect on the surface topography of the fibers during treatment.

We optimized the CH4 and H2 gas flow rate of chemical vapor deposition (CVD) graphene growth and obtained larger area, fewer-layered graphene grown on Cu foils. After transfering to SiO2 substrate by PMMA more than 3 times to repair the defect of monolayer graphene film, we synthesized large area, transparent and continuous graphene film. The morphology and structure were characterized by SEM and Raman spectroscopy. Analysis of electrical properties and optical properties show that we obtained low resistance and high transparency of ~90%, which could be used on photoelectric device as solar cell and acceptable for replacing commercial ITO electrodes.

High-Energy Ball Milling was used to disperse carbon nanotubes (CNTs) in Al-5wt%Mg matrix and hot-pressing were used to consolidate the composite powders with different CNTs contents. The results showed that a certain weight of CNTs can be homogeneously dispersed in the matrix through the high-energy ball milling, the most of CNTs are embedded in the Al-5wt%Mg matrix and have a close bonding with the Al-5wt%Mg matrix. In addition, CNTs can play the role of grinding aids to prevented agglomeration of particles. Tensile strength and hardness of the CNTs/Al-5wt%Mg composites increase by 47.9% and 37.25% respectively when the CNTs was 2wt% in the Al-5wt%Mg composites. The fracture surfaces of the composite with 2wt% CNTs involved in the pulling out and breakage of CNTs. In this case, both Orowan looping and load transfer were proved to be the strengthening mechanisms of the CNTs/ Al-5wt%Mg composites.

CNTs/Al composites were fabricated by high energy ball milling. The phase structure and consti- tuent of the preparation process were analyzed. The interface reaction and the formation process of the interface reaction product Al4C3were discussed by thermodynamics and kinetics. The result shows that no Al4C3can be found in Al-CNTs composite powders fabricated by high energy ball milling. Al4C3exists in the inter- face after pressureless sintering. And no appreciable amount of Al4C3was observed in CNTs/Al composites directly by powder metallurgy. It shows that high energy ball milling can benifit the interface reaction. And the purified CNTs, never milled, is stable in the preparation process of CNTs/Al composites by powder metallurgy.

Different parameters are used to characterize the conductivity of copper powder with silver plating. Ethanediamine（C2H8N2） is employed to adjust the pH value of plating solution (solution A), and chelate Cu2+ generated by side reaction, forming sound five-membered ring structure with Cu2+, thus preventing the formation of Cu(NH3)42+ which can avoid adsorption of Cu(NH3)42+ on the surface of copper powder. In this way silver-plated copper powder with conductivity equal to fine silver powder can be obtained, the effects of dosage of C2H8N2 and Tollens' reagent concentration on performance of silver-plated copper powder have also been investigated. The result shows that dosage of C2H8N2 has significant effects on electrical conductivity of silver-plated copper powder. The dosage of C2H8N2 should ensure that pH value of control solution A maintains 9.0~10.0. The concentration of Tollens' reagent should make sure that the generated silver-plated copper powder is most even and continuous and tightness when silver particles in form of heterogeneous nucleation is surrounded on the surface of copper powder, , and the optimum concentration is 0.09mol/L. The conductivity of silver-plated copper powder made by Tollens' reagent with 0.09mol/L concentration is optimal, which is 3.9×10-4Ω•cm,when adjusting the pH value of solution A to 9.5 by C2H8N2 control.

We investigated the optical characterization of luminescent thioglycolic acid (TGA) stabilized CdTe quantum dots (CdTe-QD) synthesized in water. The influence of stabilizing agents on the luminescent properties of water-soluble CdTe quantum dots (QDs) was described. It is found that QDs can be synthesized easily when TGA is chosen as stabilizing agent and TGA leads to preparation of highly luminescent QDs due to the secondary effects of bonds between Cd2+ and sulfhydryl groups. The absorption wavelength and PL stability of TGA-CdTe are also characterized. Size can be controlled between 2.0 nm to 4.0 nm. The TGA-CdTe QDs prepared at 2 h reaction time possess excellent luminescent properties.

According to the road load spectrum and the given engines parameters of a car, a comprehensive test method which can analyze and optimize the reliability life of gear and bearing assembly for FF mechanical transmission has put forward. This test method can diagnose the fatigue damaged components of the transmission and provide experimental support for optimizing the structure of the transmission as well as improving the transmission performance and the overall fatigue life.

The composite material has been widely used in aircraft structures. But this kind of material has some shortage such as poor impact resistance, low residual compressive strength, which have a negative influence on the performance of aircraft structures. In this paper, simulations of low-velocity impact and compression process of composite laminates with AL ply has been done. Finite element software ABAQUS/Explicit has been adopted to simulate the 3.5J impact and compression. A certain number of composite laminates with different thickness of AL ply has been tested, equal weight traditional composite laminates also been simulated as comparison. The simulation results show that AL ply with certain thickness can improve the residual compressive strength.

Sandwich composite laminates structure is a classic application of composite material on actual aircraft structural. Dealing with low-velocity impact damage and residual compressive strength of sandwich composite laminates, explicit finite element method of ABAQUS/Explicit software was adopted to simulate low-velocity impact and compression process. Impact response and invalidation on compression between sandwich composite laminates with different core materials and regular composite laminates were compared. The simulation results indicated that softer core materials can absorb more impact energy, reduce the structure damage and enhance the residual compressive strength after impact.

The composite material has been widely used in aircraft structures. But this kind of material has some shortage such as poor impact resistance, low residual compressive strength, which have a negative influence on the performance of aircraft structures. In this paper, simulations of low-velocity impact and compression process of composite laminates with AL ply and different core material has been done. The simulation results show that softer core materials and AL ply with certain thickness can improve the residual compressive strength

This paper analyzes the reasons that lead to edge failure on back-up roll and puts forward the countermeasures. The corresponding mathematical model of present grinding curve is designed, in order to adapt reconstructed roll.

Moving-magnet linear compressors with sensorless top dead center (TDC) control method are an efficient solution for domestic refrigerators to save energy. TDC can be determined by the inflection point of phase difference between the sinusoidal current and piston displacement (I-Xphase difference). A digital correlation method is used to calculate theI-Xphase difference to obtain the TDC position for control. The TDC determining system using digital correlation method is manufactured and the error is 2.29% under various discharge pressures.

In order to improve the lubricating performance of the headface sliding bearing, a new kind of the bionic headface sliding bearing, which has defined lubricating dimple pattern, has been designed based on the phyllotactic theory, and fabricated with UV lithography method and electrolytic technology. A electrolytic experiment of the dimple has been done and analyzed about the influence of the electrolytic time to the electrolytic depth against the different phyllotactic parameters. The analytical results indicate that the phyllotactic parameters influence the lubricating dimple arrangement configuration, so as to improve lubricating performance of the bearing. The increasing diameter of the dimple and the decreasing phyllotactic parameter c can increase the density of the lubricating dimple. Electrolytic experimental results show that the reasonable electrolytic fabricating can reduce the faults of defined lubricating dimple arrangement on the bearing surface.

In this work, a series of combustion experiments for oil shale semi-coke , rice straws as well as their mixture were conducted by the thermogravimetric analyzer at different heating rates (10, 20 and 50 K/min) under atmospheric pressure. Combustion characteristic curves and combustion characteristic parameters were acquired. The results showed that the combustion process of blends can be broadly separated into three stages: combustion of the volatile matter, combustion of fixed carbon and combustion of difficult decomposition substance. The point of ignition and burnout shifted to higher temperature with increasing the heating rates. Furthermore, kinetics parameters were analyzed in the second stage. The result showed feasibility of using the reaction model to solve the kinetic parameters of biomass combustion. Finally, the obtained DTG curves were separated by Gaussian Fitting method. The result showed that the derivative thermogravimetry (DTG) curve displays an overlapping peak consisted of three sub-peaks at 645–900K under heating rate of 20K/min.

This study develops a methodology to assess the probability for the degraded PWR steam generator to rupture first in the reactor coolant pressure boundary, under severe accident conditions with countercurrent natural circulating high temperature gas in the hot leg and SG tubes. The first step performs thermal-hydraulic analysis to predict the creep rupture parameter of the tubes in severe accident. The next step applies the creep rupture models to test the potential for the degraded SG to rupture before the hot leg. Then, the mean of the SG tube rupture probability was applied to estimate large early release frequency in LERF (Large and Early Release Frequency) model, and the overall LERF risk due to the Induced SGTR was calculated. In the final step, implementation of severe accident management guidance (SAMG), such as the RCS depressurization and refilling to SG, is evaluated using PSA approach. It can be found that strategy of RCS depressurization and refilling to SG can mitigate the result of induced SGTR and LERF effectively.

Co-combustion experiment of oil shale semi-coke and corn stalk at different blend ratios was performed using thermogravimetric analyzer. The influence of different blend ratios has been studied. The combustion characteristics are obtained under the heating rates of 20oC/min and the experimental temperature range of 40-850oC. The combustion process of the blends is divided into three stages: low-temperature stage, transition stage and high-temperature stage. With the increasing of corn stalk in the blends, the reaction of combustion mainly shifts from high-temperature stage to low-temperature stage, and there is no obvious change for the ignition temperature, but the burn out temperature comes down. The combustion kinetics parameters of the blends were analyzed using Flynn-Wall-Ozawa model. The result shows that the activation energy of the volatile matter stage increases and the activation energy of semi-coke combustion stage decreases. The combustion characteristics of the oil shale semi-coke get improved significantly with the mixture of corn stalk.

A model for the combustion of oil shale in the 65t/h circulating fluidized bed (CFB) boiler was developed, consisting of oil shale combustion, steam-water and ash circulation system, calculating the O2 and RO2 content of flue gas emission under three kinds of oil shale combustion in 65t/h CFB boiler. The calculated results indicate that the simulation values are consistent with the experimental values. Effect of boiler load on the temperature of furnace, flue gas emission, inlet and outlet flue gas of economizer was discussed based on the model. Boiler load on the increase results in a increase in temperature of furnace, flue gas emission, inlet and outlet flue gas of economizer. The main performance parameters of 65t/h oil shale CFB boiler system were discussed and preliminarily predicted by the model.

Daqing oil shale semi-coke combustion experiment has been performed through the Spouted bed experimental device for obtaining the temperature distribution, temperature and carbon content of separation materials. This paper presented the experimental study that the effect of three factors, containing screening particle size, wind speed and feeding flux, on the temperature variation of spouted bed and separation materials, and the carbon content in separation materials under different operating conditions. The experimental results show that the screening particle size and wind speed had great influence on the temperature of separation materials, while the carbon content is inversely proportional to the temperature of separation materials. This research further understands the combustion characteristic of Daqing oil shale semi-coke in spouted bed, establishing the foundation for the solid heat carrier retort in rotating retorting.

To measure optical parameters of biological tissues, support vector machine was adopted. The diffuse reflected light on the surface of the biological tissue corresponding to optical characteristic parameters of human tissue were obtained by Monte Carlo simulation. The nonlinear relationship model had been established between the diffuse reflected light and the optical parameters. The optical parameters were obtained by the support vector machine and the diffuse reflected light. That were compared with the given values of the same sample, and they were coherent basically. It was shown that support vector machine used to measure optical parameters had a high accuracy.

Gas-solid flow behavior of the bottom zone of a 65t/h High-low bed CFB was simulated using the commercial computational fluid dynamics (CFD) software package Fluent. The Eulerian-Eulerian model (EEM) based on the kinetic theory of granular flow (KTGF) was adopted. This approach treated each phase as continuous separately. The link between the gas and solid phases was through drag model and turbulence model. While the turbulence was simulated by the standard k-ε and mixture multiphase model, the Gidaspow drag model was used to model the interphase interaction. Four phases were set to achieve size distribution in the EEM. Gas and solid flow profiles are obtained for solid velocity, solid volume fraction, pressure, and size distribution. The results show that EEM can predict preferably the internal circulation process of the dense zone high-low bed CFB.

The combustion experiments of oil shale semi-coke and corn stalk mixtures were conducted using thermogravimetric analyzer. The results show that the advance ignition and burnout can be achieved when semi-coke is mixed with corn stalk. The influence of different blend ratios has been studied, and the combustion characteristics were obtained. Comprehensive combustion characteristics get improved with the increase of corn stalk proportion in the mixture. The interaction of mixture in the combustion process occurs mainly in 400-600oC. It can be explained that the combustion of fixed carbon in corn stalk is delayed. What is more, TG curves were simulated by Johnson-Mehl-Avrami equation. The result shows the feasibility of using Weibull distribution to simulate the TG curves of co-combustion.

Huadian oil shale and its spent char were selected to explore the adsorption properties of oil shale and oil shale char. A bench-scale adsorption system was established for capturing hydrogen sulfide in this test. What’s more, the nitrogen adsorption isotherms test was made in automatic and rapid specific surface-area-analyzer of American’s Gemini2380, which found the adsorption curve and desorption loop of the modified oil shale and oil shale char. Meanwhile, the experiment calculated and analyzed the specific surface area and pore size distribution of samples with BJH theory. The result shows that the adsorption capacity of oil shale char is greater than oil shale. The rougher the pore structure of the adsorbent samples the greater the pore volume, the larger the specific surface area, the better the adsorption effect of H2S.

N-alkyl poly(p-phenylene terephthalamide)s (PPTA) is synthesized from PPTA and bromoalkane via metalation process in a solution of potassium methylsulfinylcarbanion in dimethyl sulfoxide. The modified PPTAs have been dissolved in conventional solvents, such as THF and CHCl3. The effects of substituted alkyl, substitution degree and inherent viscosity of PPTA on the solubility of N-alkyl PPTA were discussed. The substitution degree is calculated by FTIR and NMR. The molecular weight and distribution of N-alkyl PPTA has been obtained by GPC. The thermal properties are also discussed.

The effects of packaging container on quality characteristics of peanut oil were investigated in this paper. Peanut oils were stored in two containers respectively: folding Polyethylene terephthalate (PET) bottles and common PET bottles. Peroxide value (PV), tocopherol and fatty acid composition of peanut oils were determined after 9 weeks of storage. Results showed that the PV of peanut oils in folding PET containers was significantly less than that of common PET bottle during storage period. The decrease extent of unsaturated and saturated fatty acid of peanut oils in folding PET containers was less than that of common PET sample. The degradation speed of fatty acid could be restrained by folding PET container. α-, and δ-tocopherol losses of peanut oil in the folding PET container were significantly reduced.

The numerical simulation of squeeze casting to right motorcycle crankcase,as a object of study, has been performed ，based on finite element analysis software on casting and orthogonal test method.Firstly,the three feeding technology parameters, feeding pressure,feeding delay and dwell time, were confirmed by calculation and analysis after the forecast of shrinkage defects location,then,orthogonal test and test program optimization to the parameters were completed. The results show that the deeding effect was the best when the parameter values , respectively,were 190Mpa,7.5s and 12s.

The inventory-routing problem is an important approach for the enterprises to save energy and improve efficiency. The improvement of the utilization rate of vehicles and the reduction of the dispatching cost can be realized by solving this problem effectively. This thesis focuses on the inventory-routing problem and put forward a heuristic algorithm based on the greedy rules whose key strategy is to cycle select the Hamilton transportation route with the current lowest unit cost. The simulation example indicates that this algorithm can effectively improve the trucking efficiency and save the transporting cost.

We report the fabrication of a tin nanoparticles coated anode in graphene (SnO2 /graphene) for lithium-ion batteries. As an anode material for Li ion batteries, it has 806mAhg-1 and 683mAhg-1 capacities for the first discharge and charge, respectively, which is more than the theoretical capacity of tin oxide, and has good capacity retention with a capacity of 606mAhg-1 after 30 cycles.

Anatase nano-TiO2 film was prepared by sol-gel method and graphene oxide nanosheets synthesized by Hummers method were deposited on this TiO2 thin film. Another nano-TiO2 film was then deposited on the graphene film forming sandwich-like to avoid graphene layer peeled off. Scanning electron microscope shows that TiO2 particles layer with a diameter of about 20 nm were densely and uniformly deposited on both surfaces of the graphene layer to form a sandwich-like composite structure. The composite films exhibit excellent photocatalytic degradation to methyl orange and remains chemically stable in the whole process without anything exfoliation.

This paper explores a method of conversing the cutting tool angle between the different reference systems, and this method is based on geometric method. A variety of different type of cutting tools can be induced to a simple module through this method. The paper obtains the general angle calculation formulas.

According to the model tests of the broken rock behind the tunnel lining impacting on the structural safety, and numerical simulation studying the tunnel in 3 different stress fields while the broken rock locates 2 different positions, the article studies the safety of tunnel structure. The results showed that: in a uniform stress field, the lining played a maximum carrying capacity whenever the broken rock on the vault or behind the right side of the wall. In the horizontal pressure based stress field, when broken rock is on the vault, the grouting effect is most significant and the negative moment was controled by the rate of 75%. In the vertical pressure based stress field, when the broken rock is behind the right side wall, the disease spread sporadically throughout the arch after grouting.

The poly (2-methoxy-5-(2-ethylhexyl oxy)-1, 4-phenylenevin- ylene) (MEH-PPV) was used as a secondary electron donor material in the poly (3-octylthiophene) (P3OT): graphene bulk-heterojunction photovoltaic cell. The XRD investigation of the active layer showed a well-organized intraplane structure with lamellae oriented normal to the substrate. The mechanism of charge transfer in the multi-donor PV cell was investigated; it shows that efficient energy transfer takes place from MEH-PPV to P3OT. The reason for the increase in the open-circuit voltage which dues to the band structure of BHJ where the energy level change of the highest occupied molecular orbital of the MEH-PPV: P3OT as multi-donor. The hybrid devices showed the energy conversion efficiency of the multi-donor BHJ solar devices with moderate amount of MEH-PPV. The surface roughness investigation indicated the morphology of the hybrid active layer film.

SnO2@C/graphene nanocomposite was prepared via chemical synthesis method. The electrochemical performance of the SnO2@C/graphene nanocomposite as anode material was measured by galvanostatic charge/discharge cycling. As an anode material for Li ion batteries, the SnO2@C/graphene nanocomposite shows 823mAhg-1 and 732mAhg-1 capacities for the first discharge and charge, respectively, which is more than the theoretical capacity of tin oxide, and has good capacity retention with a capacity of 748mAhg-1 after 30 cycles. These results suggest that SnO2@C/graphene nanocomposite would be a promising anode material for lithium ion battery.

This paper presents a multi-criteria group decision making method based TOPSIS, which can be used to deal with heterogeneous information(the numerical, interval valued and linguistic variable with different granularity). The uniform and aggregation of the heterogeneous information is investigated to effectively avoid loss of information. The OWA Operator based on separation measures is constructed. Finally, a numerical experiment is used to illustrate the feasibility of the proposed method.

Strategy use is a mental operation which aims directly at its target. In order to investigate brain activity during mental arithmetic strategies using, subtraction answers-discrimination tasks were used through 8 healthy subjects with the Event-related Potentials (ERPs) technique. The results showed: (1) The principal components of ERP were: N1, P1, P2, P300 and N400. (2) At the F3, C3 point, stage 4 induced more negative wave than stage 1; At F4, C4, P3 and P4 point, stage 4 induced more positive wave than stage1. (3) Activation of brain areas mainly included Temporal lobe, Prefrontal cortex and Parietooccipital. (4) With the subjects gradually skilled in using strategies, activated brain region gradually moved from back to front; meanwhile the right side had higher active level than the left of brain. Further exploration need to describe more detailed brain potentials during mental arithmetic strategies using in other conditions.

To increase the speed of image matching, this paper combines Bacterial Foraging Algorithm (BFA) of swarm intelligence with wavelet transform, and presents a fast matching method. The method regards the problem of image matching as a search for the optimal solution. To provide artificial bacterial swarm algorithm with an appropriate fitness function, the Normalized Product correlation (NPROD) is employed to measure the similarity between the template image and the searching image. Then the best coarse matching position is gradually approaching by chemotaxis, elimination and dispersal, and reproduction behaviors of artificial bacterial. Finally, the best matching position is found out according to the coarse matching position. Experimental results show that the proposed method is fast and efficient.

Due to the feasibility and the efficiency in image engineering, Grey Theory proposed by Julong DENG has been paid more attention by many researchers at home and abroad. The feature of the theory lays in the fact that modeling or analysis is easy to implement even in the condition that only few samples are available. Many research fruits on digital image are produced so far. Focusing on edge detection of digital image, this paper gives a survey of the application and predicts some future developments after some basic theory are described.

Oleoyl chloride was synthesized by oleic acid and thionyl dichloride (SOCl2), and then reacted with chitosan in dichloromethane to obtain the oleoyl chitosan. Novel water-soluble oleoyl acetyl chitosan (OACh) was synthesized using oleoyl chloride reacted with acetic anhydride in pyridine. The chemical structure of the OACh was characterized by FT-IR, 1H and 13C NMR. There existed the peaks at 1743.9 cm-1 (C=O) and 1658.1 cm-1(C=C) in FT-IR spectrum, and the peaks at 170.8, 171.6 and 172.5 ppm which were assigned to the C=O of the oleoyl and acetyl groups in 13C NMR spectrum. The results indicated that OACh had oleoyl as hydrophobic moieties and acetyl as hydrophilic moieties.