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With the rapid development of ferrous metallurgy, the production of iron tailings as waste after beneficiation is increasing. Due to the shortage of natural stone in road construction, iron tailings can be used as an alternative material to natural stone in semi-rigid bases. In order to study the feasibility of application of cement stabilized iron tailings (CSIT) in semi-rigid base, unconfined compressive strength (UCS), indirect tensile strength (ITS) and cyclic freeze-thaw tests were carried out on cement stabilized iron tailings (CSIT). The gradation composition and cement content were selected as influencing factors. The results show that under the condition of the same cement content, the UCS and ITS of CSIT are proportional to the particle size in the mixture. In CSIT with the same gradation, the mechanical properties increase with the increase of cement content; CSM-40(B) has a higher UCS and CSM-40(C) has a higher ITS, the frost resistance coefficient of CSIT increases with the increase of cement content and the tendency of frost resistance coefficient decreases with the increase of cement content. The frost resistanceofCSM-40 (B) is better than that of CSM-40 (C) for the same cement content. Therefore, for the use of iron tailings in CSM, a suitable gradation composition and cement content should be selected.

Lanthanum chromite(LaCrO3) with different amounts of PVB solution were synthesized by classical solid state reaction. We have studied the effects of different amounts of PVB solution( 0 mL, 1 mL, 2 mL, 3 mL) during prilling process on the microstructures and electrical properties of LaCrO3. The scanning electron microscopes, relative densities and resistivities of samples suggest: (1) the sinterability of LaCrO3is optimal among samples when adding 1 mL PVB solution to LaCrO3powder during prilling process. (2) sample with 1 mL PVB solution has the highest resistivity, while other counterparts’ resistivities have no distinct correspondence with the amount of PVB solution.

ZSM-5 zeolite was synthesized using diatom mud as the raw material, and then doped with different amounts of Nd2O3. Nd/ ZSM-5 zeolite was synthesized at °C for 24 h after stirring at high speed and aging in the synthesis mixture with the molar composition of 1.5 Nd2O3:25Na2O:150SiO2:1Al2O3:10TPABr:2500H2O.XRD confirmed Nd/ZSM-5 crystal phase. TEM showed that Nd/ZSM-5 zeolite crystal sizes are about 2-4μm. EDS shows Nd/ ZSM-5 zeolites chemical element compound. FT-IR analysis further showed that they are pentacyclic with typical absorption summit of ZSM-5 at about 547 cm-1.

Marine Oil spills have become a serious environmental problem, and contribute to severe impacts and economic losses. Fast and efficient cleanup of oil from marine environment is vital. The use of sorbents is one of the most efficient techniques in removing oil from water. In this work, pure polypropylene (PP) ultrafine fibers with 2 μm diameter were prepared by air assisted melt electrospinning device to be used as oil sorbent. Two fiber samples were used in this study, fluffy, cotton like appearance and oriented, cloth like appearance with different porosities. The influence of temperature change on oil/water mixture was studied. Fluffy fibers showed a better performance in sorption capacity. Results indicated that change in temperature was an important factor in determining the sorption capacity of the fibers. Additionally, in contrast to solution electrospinning, melt electrospinning is safer, cost effective and environmental friendly because of solvents elimination.

The basic mechanical performance of glue laminated timber (GLT) reinforced with glass fiber reinforced plastic (GFRP) for structural materials was studied. The differences of mechanical performance of the GLT reinforced with GFRP and the common GLT were compared by the test, and the quantitative influence of reinforcement ratio and arrangement pattern of GFRP on the mechanical performance was investigated. The test results showed that the static bending strength of GLT increased with the increasing of GFRP reinforcement ratio, and the reasonable arrangement pattern of GFRP could improve the internal bonding strength of GLT. The influence of reinforcement ratio and arrangement pattern of GFRP on the elastic modulus was relatively small. Finally, a mathematical model of static bending strength for GLT reinforced with GFRP was proposed, which can consider the influence of reinforcement ratio and GFRP arrangement pattern

Tool edge preparation can eliminate defects and realize hone cutting edge, which can improve the quality of the workpiece surface, elevate the stability of cutting process and the tool life. In order to better investigate the edge preparation mechanism, the influence law of the edge preparation process parameters on the cutting edge is analyzed. The paper presents the single factor experiments and orthogonal experiments with the cemented carbide milling tool spindle rotation rate, edge preparation time, abrasive size and abrasive ratio in drag finishing. The edge preparation mechanism is revealed in the paper, which provides basis for the structure optimization of cutting edge contour.

The tool edge preparation has a significant influence on the quality of the workpiece surface, the stability of the cutting process and the tool life. In order to investigate the effect of the tool edge preparation, the impact on the cutting force components, the roughness and the residual stress is analyzed through the response surface methodology. The paper presents experimental results of turning tests with different edge radius and changing the cutting speed, the feed amount per tooth, the axial depth, and the radial depth. The research results will put forward theoretical value and practical significance to develop the processing technology of high-speed and efficient cutting, improve the metal cutting theory and prompt the development of the manufacture industry.

Inorder to analyze the influence of the grinding wheel parameters on the spiralgroove parameters in the grinding process of spiral groove, this paper analyses indetail the influence of grinding wheel radius, fillet radius and grinding wheelcone angle on the rake angle and the opening angle of the spiral groove basedon the spiral groove mathematical model of the end mill. And two polynomial werefitted between the grinding wheel fillet and the rake angle of spiral groove. Studieshave shown that: when the wheel attitude angle remains unchanged, the fillet ofgrinding wheel influence the rake angleand opening angle of spiral groove significantly; the cone angle of grindingwheel affects the opening angle largely; the radius and cone angle of grindingwheel have the weak influence on the rake angle of spiral groove.

In recent years, very high cycle fatigue has become a major concern in design and durability of engineering components and structures such as railway wheels, rails, offshore structures, bridges, load bearings, etc. There are some factors which have been assumed to influence the fatigue behavior for metallic materials in VHCF regime. But most factors influencing the VHCF behavior have not been studied thoroughly. In order to deeply understand the essence of material fatigue, the experimental and theoretical aspects of the factors influencing on very high cycle fatigue for metallic materials should be studied further more. This paper deals with an overview on the effect of factors on the property in very high cycle fatigue regime. Research trends and some conclusions in this field are briefly discussed and obtained.

With the increase of design fatigue life of many critical mechanical components and engineering structures, research on very high cycle fatigue (VHCF) has become a new topic for engineering components failure. This paper summarizes works of VHCF of high strength steel, such as the observations on fish-eye, which is one of the typical characteristics in VHCF regime; Characteristics of crack initiation and crack propagation are analyzed based on fracture surface; The present work also analyzes the fatigue mechanism and related models. Loading frequency effect on the VHCF behavior is also discussed. Some prospective aspects of future researches are proposed.

In recent years, the core engineering components of high-speed train, automobiles and aircrafts are required to endure fatigue loads up from 108 to 1010 cycles. The present study results show that in the very high cycle fatigue (VHCF) regimes of more than 107 cycles, the fatigue failure of high strength steel materials can occur below the traditional fatigue limit, hence the VHCF investigations of high strength steels not only help to further understand the fatigue essence and mechanism, but also do research on the fatigue design and life assessment method. This paper summarizes works of VHCF researches for high strength steels in recent years, such as the characteristics of S-N curve, the observations on fish-eye, which is one of the typical characteristics of fracture surface, crack initiation, crack propagation, etc. The present work also analyzes the fatigue mechanisms and briefly discusses several factors that affect VHCF properties, such as hydrogen effect, inclusion effect, frequency effect. Some possible and prospective aspects of future researches are also proposed.

In this work, hot compression tests on columniform TC18 titanium alloy specimens were performed with a Gleeble® 3500 thermal and mechanical simulator in the temperature range of 820-875 °C and at constant strain rates of 0.01, 0.1 and 1 s−1. Relationship model of true stress versus true strain as well as peak stress versus deformation temperature were established, and microstructural micrographs of TC18 titanium alloy were analyzed. The results showed that the flow stress decreased as the deformation temperature increased or the strain rate decreased. Besides, the deformation resistance at temperature above Tβ (β transus temperature) was obviously lower than that at below Tβ. In addition, flow stresses kept almost constant when it deformed in β region where hot deformation mechanism is DRV, but significant flow softening occurred in α+β region, where deformation mechanism is mainly dominated by DRX. And in α+β region, DRX is prone to occur at a low strain rate, and it is difficult for DRX to occur at high strain rate.

This study researched the aerodynamic characteristics of a two-dimensional trajectory correction fuze used for the common artillery ammunition, which increases the targeting accuracy by decreasing the circular error probability. The correction fuze has a pair of fixed canard and a pair of steering canards for roll control and guidance. In this study, computational fluid dynamic (CFD) simulation is performed to study the aerodynamic characteristics of the trajectory correction fuze. The primary purpose of this performance was to predict the aerodynamic coefficients and flow field over a spin-stabilized projectile with the correction fuze. Calculation covered from-10 degrees to 10 degrees steering canards deflection over speed range from Mach 0.6 to 3. The results showed the variation law in the rotary moment of correction module and the control forces of the steering canards with the Mach varying, providing aerodynamic reference for the research of trajectory correction projectiles in the future.

In this paper, the effect of welding processes such as friction stir welding (FSW), laser beam welding (LBW) and pulsed current gas tungsten arc welding (PCGTAW) on comprehensive mechanical properties of AZ31B magnesium alloy was reviewed. Among the three different welding processes, the LBW joints showed superior comprehensive properties to FSW and PCGTAW joints. The formation of very fine grains in weld region, higher fusion zone hardness, uniformly distributed finer precipitates were the main reasons for superior comprehensive mechanical performance of LBW joints compared to PCGTAW and FSW joints.

The evolutions of physical properties of composites during the curing process of the carbon fibre reinforced resin composite, such as density, modulus, coefficient of thermal expansion, specific heat capacity and thermal conductivity, were analyzed and those evolutions were introduced into the numerical simulation. The new approach to construct the curvilinear coordinate system by streamline equation of steady flow was proposed with the complex curved structure composite as the study object. By using the finite-element method and building the curvilinear coordinate system, the distribution of internal temperature, degree of cure, internal stresses and evolutions of physical properties during the curing process of the composite skin plate of a light aircraft wing were calculated. The deformation of the skin plate caused by the uneven distributions of temperature field and cure degree field, anisotropic thermal expansion coefficients and volumetric shrinkage of resin were calculated in the same model. From the numerical simulation results, it can be concluded that the curing process will be more reasonable and more accurate when the evolutions of physical properties of composites are adopted and the curvilinear coordinate system constructed by streamline equation of steady flow is fully applicable to finite element analysis of composite curved structure.

A metal titanium coating was prepared in alumina foam by chemical vapor deposition method. The phase composition of the coating was analyzed by X-ray diffraction (XRD). The coverage of the coating on the alumina foam was analyzed by both optical and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS). The results showed that the obtained titanium coating had a high purity, and showed a good coverage and uniform distribution on the skeleton surface of the foam. The skeleton surface became smooth due to coverage of the tiny holes and cracks by the coating.

The rapid development of the large steel structure brings a great opportunity for steelmaking industry. The steel plates not only have the strength and toughness but also can withstand the high energy input welding. Using the calcium oxide of high melting-point and high stability to pin the grain boundaries is an effective method to improve the welding performance of the structure steel. This experiment takes the HSLA steel as the research object, the second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium into the steel in the form of Ca-Si alloy. The effect of calcium addition on the cast microstructure of HSLA steel was analysed. The results show that the cast microstructure is mainly consist of lamellar and acicular ferrite, a small amount of pearlite and bainite. Compared with the original steel, there are acicular ferrites presenting in the experimental steel after adding 5 wt% Ca, which are the microstructure that we hope to get. The acicular ferrite will have a positive impact on the mechanical properties of the subsequent rolled steel.

Surface treatment was carried out on the butt joint weldment of P355NL1 steel by using the HJ-II-type ultrasonic impact machine. The ultrasonic impact current is 1.5A, the impact amplitude is 20 microns and ultrasonic impacting time is 5min. Tensile test was carried out for both treated specimen and un-treated specimen. The fracture observed with the scanning electron microscope of 6360LA type. The experimental results show that although the compressive residual stress can be obtained in the surface of weld toe area, and the grain size in the welded joint can be refined, but the mechanical property of the butt joint of P355NL1 steel can not be improved through the ultrasonic impact treatment. The main reason is that the ultrasonic impact layer is only 120um, it is to thin to compared to the thickness of the specimen.

Tube hydroforming (THF) is one of metal forming technologies which has been widely used to manufacture complex hollow workpeices. In THF, a variety of failures may occur and one of them is wrinkling. But recent researches show that wrinkling may be used as a preforming process to improve the formability of tubes. In this paper, a new geometry-based wrinkling indicator is proposed to evaluate the wrinkling level in THF and the wrinkle evolution diagram (WED) based on the shape change of the wrinkles is presented to display the four-stage evolution of the useful wrinkles. The wrinkling levels in THF with axial feeding under various loading paths are predicted respectively via finite element simulation, the influence of loading paths on the wrinkling behavior is investigated, and the evolving stages of the useful wrinkles is revealed via the proposed WED. The results indicate that the proposed wrinkle indicator can distinctly evaluate the wrinkling level, the wrinkling level under pulsating loading path is higher than that under polygonal linear one and four-stage evolution of the useful wrinkles could be evidently demonstrated via the WED. Notation

Big data is mainly for analytic applications, which puts high requirements on data processing ability instead of computational accuracy. In this environment, software engineering-based methods should be carried out with the goal of data processing and computation. To adapt to the development of various analytic applications in big data era, this paper provides a software design model based on big data, and at the same time, analyzes compiler mechanism of big data programming language.

Surface treatment was carried out on the welded cruciform joint of P355NL1 steel by using the HJ-II-type ultrasonic impact machine. The ultrasonic impact current is 1.5A, the impact amplitude is 20 microns and ultrasonic impacting time is 5min. Tensile test was carried out for both treated specimen and un-treated specimen. The fracture observed with the scanning electron microscope of 6360LA type. The experimental results show that although the compressive residual stress can be obtained in the surface of weld toe area, and the grain size in the surface of welded cruciform joint can be refined, but the mechanical property of the welded cruciform joint of P355NL1 steel can not be improved through the ultrasonic impact treatment. The main reason is that the ultrasonic impact layer is only 70um, it is to thin to compared to the thickness of the specimen.

Based on test method of numerical simulation, the bearing characteristics of large-diameter rock-socket pile with different super-thick pile caps have been analyzed, including the finite element model, Numeric Simulation of different heights of pile cap, Pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that pile cap thickness has little influence on pile bearing capacity for the thick pile cap, when thickness of pile cap increases to a certain thickness, it would not affect the settlement characteristics under the pile caps. With the increase of the thickness of cap, the pile side friction load sharing value of pile side friction decreases, while the load sharing value of pile tip load increase, and soil force under the pile cap does not change with the different thickness of pile cap. However,it is advantageous to increase cap thickness to reduce tensile stress.

Big data is another disruptive technological revolution following cloud computing and Internet of Things (IOT) in IT field. Its dramatic growth makes enterprises gradually facing unprecedented challenges in storage architecture, and brings subversive innovation for IT enterprises. This paper presents five challenges in computer professional education under big data environment in IT field, and discusses the corresponding measures of computer specialized education from different aspects, such as the adjustment of subject content, changes of talent cultivation, innovation of teaching mode, and improvement of teachers’ quality.

Shadowed by temporary exhibition cloth and other non-structural enclosure structures, the wind loading area of temporary stand increase dramatically, thus, temporary stand is easily to be overturned by a wild storm. The surface wind pressure of temporary stand accompanied with cover is presented in this paper by CFD numerical method. The method to identify the wind load on the surface of space truss temporary stand is also proposed with the identified pressure coefficient. The method proposed in this paper is of great use to improve the security of space truss temporary stand.

Geometrical parameters of welded joint affect the stress concentration coefficient seriously. In order to increase the fatigue property of welded structure, it has great significance to reduce stress concentration coefficient of welded structures by researching and improving the geometry of welded joints. In this paper, the effects of weld toe inclination angle θ and weld edge transition arc radius r on the stress concentration coefficient of welded butt joints of magnesium alloy were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the two parameters was also researched. The calculation results indicate that reducing weld toe inclination angle or increasing transition arc radius can effectively decrease the stress concentration coefficient of welded butt joints, so as to improve the fatigue property of welded structures. For the safe use of welded structures, the true weld edge transition arc radius r should be greater than 3mm, and weld toe inclination angle θ should be smaller than 30°.

Combining with the localized analysis capability of the wavelet and the learning capability of the neural network, this article investigates the wavelet neural network nonlinear time series model and the wavelet neural network architecture integrated model which combines the affine transformation and the rotation transformation ,moreover, based on wavelet neural network algorithm that substitutes the Morlet wavelet function for the Sigmoid function, researchers analyze the application of Wavelet Neural Network in settlement deformation of high-speed rail. The example this paper discussed shows that the wavelet neural network has good results in the deformation prediction, especially in large complicated engineering.

As the potential of using natural log is explored in the temporary structure, especially in template as the shores, it is important to gain further understanding of the microstructure and properties of cells such as undersize tree of Northeast larch that under macro buckling load. The research described in this paper focuses, for the first time, after the initial preparation by microtoming, on investigating the microstructure of log by analyzing of the ESEM images, and a model for deformation and failure mechanism of the cell had been proposed, then, the properties of cells were calculated through image software. Results show that the cells including early wood and late wood under without extra load are regularly arrayed, the deformation of the wall was induced by asymmetric out of plane twisting and splitting due to buckling of the logs, failure of the early wood cell is easily than late wood that following the large deformation occurs at plasticity, and two properties including late wood percentage and cell wall percentage has a direct proportion with the strength of log. The presented results indicate that it is improve to understand and analyze the failure process of cell when the log under concrete compression loading, and the reason that log as sustainable material is due to the unbroken cell clusters recover themselves as quickly as possible during at a certain enough time.

Wujiang Bridge is located on the Wujiang River in Chongqing Province in China. Based on test method of numerical simulation, the bearing characteristics of this large-diameter rock-socket pile with super-thick pile caps have been analyzed, including pile foundation load-bearing characteristics, pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that Q-s curve of this kind of pile is approximate to linear. Under the action of ultimate load, the main load was supported by pile end résistance. And according to main stress distribution of pile cap, there is an obvious spatial truss effect phenomenon in it.

Geometrical parameters of welded joint affect the stress concentration coefficient seriously. In order to increase the fatigue property of welded structure, it has great significance to reduce stress concentration coefficient of welded structures by researching and improving the geometry of welded joints. In this paper, the effects of weld tangent line angle θ on the stress concentration coefficient of welded cruciform joints of magnesium alloy were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the parameter was also researched. The calculation results indicate that reducing the weld tangent line angle θ can effectively decrease the stress concentration coefficient of welded cruciform joints, so as to improve the fatigue property of welded structures. In order to have high reliability and safety of welded structures of magnesium alloy, the true weld tangent line angle θ should be controlled less than 25°.

Supersonic turbulent mixing layer requires high spatiotemporal resolution of measuring techniques to study its aero-optical effects. However, the spatiotemporal resolution of existing techniques is not high enough. NPLS-WT (NPLS based wavefront technique) is a new aero-optics measuring technique developed in 2010. Its time resolution is 6ns, and spatial resolution and time correction resolution can reach up to micrometers and 200ns respectively. NPLS-WT was used in this paper to study aero-optical effects induced by Mc=0.5 supersonic mixing layer. The fine wavefront aberration information is revealed by the OPD of high resolution. The results show that the wavefront in near field is not sensitive to the resolution, and large-scale structures play a dominant role on the wavefront in near field. The cumulative effects analysis show us that the density difference between large-scale structures and free stream is the main reason to wavefront aberration, and the larger the vortex is, the more obvious the effect to wavefront aberration is.

A improved genetic algorithm is proposed to QoS routing optimization. By improving coding schemes, fitness function designs, selection schemes, crossover schemes and variations, the proposed method can effectively reduce computational complexity and improve coding accuracy. Simulations are carried out to compare our algorithm with the traditional genetic algorithms. Experimental results show that our algorithm converges quickly and is reliable. Hence, our method vastly outperforms the traditional algorithms.

The mathematic model of rake face was set up for precise description on the rake face of end mill in grinding process, with its basis on the fillet of grinding wheel with six axes linkage movement and two attitude angles. The sectional drawing of rake face and three-dimensional entity were drawn based on the mathematic model in SolidWorks. At the same time, the discrete entity of rake face also set up based on the Boolean calculation. The sectional drawing of mathematic model and the discrete entity tallies with each other perfectly, which indicates the correctness about the mathematic model of rake face.

We present the design and characterization of a three-dimension metamaterial consisted of a Jerusalem cross unit cell on the each side of cube lattice substrate for terahertz frequencies. The retrieved effective medium parameters from scattering data prove that the three-dimension metamaterial has a negative permeability and permittivity in wide frequencies range of 1.47-1.73 THz. We demonstrate that the three-dimension can be regarded as a polarization insensitive absorber with an absorptivity of 46% at 1.49 THz. Such designed materials may find numerous applications ranging from the active element in a thermal detector to terahertz stealth technology.

Pig farmers’ behaviors of veterinary drug usage will affect the quality safety of pork products. Based on factor analysis and the field research of pig farmers, this paper makes the evaluation research on pig farmers’ usage behaviors of veterinary drugs with real evidences. And the results show that: the indexes of pig farmers’ behaviors of veterinary drug usage are a bit low, and the main factor that restricts pig farmers’ behaviors of veterinary drug usage is that pig farmers lack knowledge of the usage of veterinary drugs. Through the behaviors such as establishing the guidance on drug usage and keeping medication administration records, pig farmers’ behaviors of veterinary drug usage can be standardized to some extent.

Temporary grandstands bear crowd load, which is created when spectators jumping on the structure. The simplified loads applied to temporary grandstand have been obtained based on experiment data of human body jumping forces. By the ABAQUS software, the parametric and automatic modeling of three-dimensional (3D) temporary grandstand structures has been realized with Python scripting. The linear buckling analysis and nonlinear buckling analysis of the structure have been carried out. The ultimate bearing capacity and the structural deformation under crowd load have been acquired. Results show that the nonlinear effect of the structure under crowd load is very obvious; the linear buckling analysis cannot get the ultimate bearing capacity of the structure and the first order buckling mode cannot simulate the final deformation of the structure either. The research of this paper greatly improve the efficiency of the construction and automation design of temporary structures and reveal the mechanical behavior of such structure to a certain degree.

The common method to determine Quasi-Geoids is GPS leveling however the Quasi-Geoid of this method determined is a kind of trend surface which not take the physical property of geoid into consideration, and the fitting method is surface fitting which only consider the surveying error, lead to inaccurate fitting result. In allusion to these problems, Remove-restore method is used to remove the long wave information of earth gravity field model to get more smooth residual gravity height anomaly, then compared the influence of different covariance function to the fitting result of least square collocation which take surveying error and model error into account. The results show that Gaussian and resemble Gaussian function can achieve higher fitting precision to the large area with height anomaly value changes significance; the Remove-restore method can effectively improve the fitting precision to least square collocation method which depend on the covariance value of each points.

The Ag-assisted electroless etching of p-type silicon substrate in HF/H2O2solution at room temperature was investigated. In this work, the effects of HF, H2O2and their volume ratio on morphology and growth of p-type silicon substrate surface by using metal assisted etching were investigated in order to produce a highly efficient antireflecting structure. The Ag metal particles were deposited onto Si wafer by electroless deposition from a metal salt solution including HF. The experimental results show that the growth rate and morphology of the pores formed on the Ag metalized Si surfaces are strongly dependent on the volume ratio of HF and H2O2.

This paper adopts a pot incubation test in greenhouse to study the enhancing applicability from earthworms (Pheretimasp.) live in the soil with PAHs.Pheretima (Pheretima sp.) had a certain level of tolerance towards PAHs polluted soils. Phenanthrene and pyrene were found to inhibit the growth of Pheretima to a certain extent. The inhibition rates were 7.09% ~ 25.19% and 6.79%~ 27.83% respectively. Furthermore, with increasing concentrations of PAHs in the soil, the inhibition effect on the growth of Pheretima became progressively stronger. In this experiment, the earthworms were found to have a certain role in promoting the degradation of phenanthrene and pyrene in the soil, but not to a significant extent, (n = 15, p> 0.05). Moreover, with the highering of the degradation ratio of pollutants, the rate of promotion of the earthworms on phenanthrene and pyrene degradation also decreased.

Theoretical and finite element models of maglev actuator are both established. Magnetic conductive rubber is added into the actuator to improve its performance. Numerical simulations and experiments show that adding conductive rubber increases the output force-power ratio while reduces the dynamic response slightly.

Based on the analysis of the advantages and disadvantages of the five currently used network traffic measurement technology, this paper proposes the distributed flow measurement model. The model divides the network by region and integrates the sub-stations and a central management station to better adapt to the high speed networks flow measurement. Meanwhile, this model greatly reduces the workload of the traffic monitoring of the central node and effectively improves the network performance because it adapts to any size LAN traffic monitoring.

Home-based care for the aged is a dominant endowment type in china. Today, the trend of population aging has become increasingly apparent, corresponding outdoor environment and facilities must be provided in residential community. As Qinghuayuan community of Zhengzhou for example, on the basis of investigation to outdoor environment and the elderly utilization, the author put forward suggestions about walking, leisure and communication to explore the design essentials of outdoor environment in residential area suitable for the elderly.

To solve the problem that conventional beam forming fails to give full play in suppressing interference of vector sensor array, a new method of beam forming for vector sensor array was discussed based on signal subspace projection. The method projects array manifold matrix on the signal subspace derived from HOSVD, resulting in a spatial spectrum computation method, which could eliminate noise better and generate a lower side lobes. Further theoretical derivations and simulation experiments have verified the effectiveness of this method.

Measured data of hydrophone array could be interfered by underwater noise,so its essential to enhance the performance of suppressing interference for adaptive array processing. How to improve the performance of Double Stages Wiener Filter was discussed based on configuration principles. The influences of interference angle, array unit number and interference-to-noise ratio (INR) to suppressing interference have been analyzed through principle analysis and simulation experiments under different circumstances, including single or multiple disturb signals. Experiments show that the performance of suppressing interference depends on interference angle and INR more and array unit sum a little.

Measured data of hydrophone array could be interfered by underwater noise,so its essential to enhance the performance of suppressing interference for adaptive array processing. How to improve the performance of Double Stages Wiener Filter was discussed based on configuration principles. The influences of interference angle, array unit number and interference-to-noise ratio (INR) to suppressing interference have been analyzed through principle analysis and simulation experiments under different circumstances, including single or multiple disturb signals. Experiments show that the performance of suppressing interference depends on interference angle and INR more and array unit sum a little.

According to the sap flow characteristics and photosynthetic characteristics of Haloxylon ammodendron and Tamarix, we measured the sap flow with the method of thermal diffusion. To monitor photosynthesis with application the instrument CI-340, and the result shows that: (1)The daily net photosynthetic rate change of Haloxylon ammodendron is a typical double peak type, and Tamarixs is a single peak type; (2)The daily transpiration variation of Haloxylon ammodendron is similar to net photosynthetic rate change rule, it has a phenomenon which we called noon break, Tamarixs isnt obvious, it presents volatile changes slightly; (3)The daily sap flow of Haloxylon ammodendron is a typical double peak type, Tamarixs isnt obvious, it presents volatile changes slightly, and at sometimes the sap flow of branches is greater than the breasts. The results provide some supports for ecological water demand of the plants. It has some significance for ecological environment construction of the Gurbantunggute Desert.

The presence of Haloacetonitriles (HANs) in drinking water is of concern due to its high genotoxi-city and cytotoxicity compared with regulated DBPs. Moreover, a shift from chlorination to chlora-mination increased the products of HANs. This paper provides a critical review of the property, the toxicity and the removal method of HANs. Exploring effective method to remove HANs and its precursors is one of the developing direction.

Nanoporous nickel phosphates (VSB-1) was synthesized by hydrothermal method. Then VSB-1 was added to the ammonium polyphosphate and pentaerythritol system in polypropylene (PP) matrix.The synergistic effect of VSB-1 with intumescent flame retardants (IFR) was studied by cone calorimetry test. The results of cone calorimetry show that heat release rate peak (pHRR) and total heat release (THR) of intumescent flame retardant PP with 2wt% VSB-1 decrease remarkably compared with that of without VSB-1. The pHRR and THR decrease respectively from 1140 to 286.0 kW/m2, and from 96.0 to 63.2 MJ/m2.

The application of microwave technique in the roasting pyrite which contained little arsenic was described. The characteristics of microwave absorption of pyrite were investigated. The results indicated that pyrite was a good absorbent of microwave and heated rapidly to high temperature by microwave flied in a short time, causing decomposition and oxidization to removal the sulfur and arsenic. The effects of microwave irradiation time and sample mass on the removal efficiencies of sulfur and arsenic with microwave power of 4 kW and 6 kW were investigated. The big microwave power could shorten the time for removal of sulfur and arsenic. Finally iron concentrate contained 64.52% Fe, S

The microwave energy absorption of solid mineral in microwave field is the key problem of the microwave metallurgy application. For the calculation formula of absorbing microwave energy (P=2πfε0ε"E2) the fundamental data is necessary, including dielectric constant and electric field strength etc. But these basic data varies in practice due to the variation of molecular structure, overall dimension, and electromagnetic parameter of the mineral. Therefore, the theoretical calculation formula is difficult to predict the microwave absorbing ability of solid mineral [1-3]. In this paper the ability of four kinds of sulphide concentrate and their mixture coupling in absorbing microwave was investigated by intermediate medium calorimetry. The results show that the microwave-absorbing ability of chalcopyrite concentrate is the strongest, sphalerite concentrate is the weakest, and sphalerite concentrate is stronger than silica, the mixture minerals still keep their own microwave absorbing characteristics. The mass percent of strong absorbent of microwave decide the microwave-absorbing ability of mixture, and affect energy transfer between microwave and mineral.

nanoTiO2 is one of the most important inorganic pigments in many different fields. The effect of sinter and thermoprint on film-forming properties of nanoTiO2 in screen printing were studied in this paper. Compared with sintering, Thermoprint uses high temperature and pressure to make nanoparticles more tight. By scanning electron microscopy (SEM), X-ray diffraction (XRD) and Coating Adhesion Test, the better film-formation properties of thermoprint are demonstrated.