Search

Al3+-modified sepiolite was synthesized through hydrothermal treatment of acidified sepiolite using sodium aluminate as a modifier. The structure and surface properties of the modified sepiolite were characterized by XRD, FTIR, NMR, and Zeta potentials. The XRD and FTIR results demonstrated that Al3+ions were introduced into the sepiolite lattice.29SiNMR of the sepiolite ore showed that Si atoms had three configurations with chemical shifts of -98.4, -95.2, and -92.5 ppm with the atomic ratio of 1.39: 1.43: 1, which was assigned to the center silicon, edge silicon, and near-edged silicon atoms, respectively. For the as-prepared Al3+-modified sepiolite, the signal intensity of the edge silicon atoms decreased and shifted from -95.2 ppm to -94.5 ppm. Moreover, a new chemical shift of - 87.4ppm belonging to Q1structure appeared. The ratio of four configurations of silicon atoms was 1.43: 1: 1.53: 1.04.27AlNMR of Al3+-modified sepiolite showed that Al atoms have two configurations corresponding to the tetra-coordination and octahedral coordination, respectively. The results of NMR revealed that the sepiolite was modified by substitution of Si atoms in the framework and Mg atoms in the interlayer, resulting in a less negative charge on the surface of Al3+-modified sepiolite.

PBO fiber is a kind of super fibers which has both high tension strength and high modulus. After the heat-treatment procedure, the PBO fiber would present more perfect mechanical properties. The process route of heat-treatment on as-spun fibers (PBO-AS fibers) was optimized, and the obtained high modulus fibers (PBO-HM fibers) were tested and characterized by SEM, XRD, XPS, FT-IR and Universal material machine. The higher the temperature is, the shorter the heat treatment time required for the same heat treatment. And the most preferred procedure in the air atmosphere of heat-treatment was 550°C with the resident time of 32 s and the pre-stress of 2.35 cN/dtex. After the heat-treatment, the modulus of PBO-HM grew up to 229.4 GPa (1487.78 cN/dtex). The tensile strength would not be greatly decreased, if the fiber could be kept in the nitrogen atmosphere. Besides, the XRD data and the XPS data proved that after the heat-treatment, the crystal size and the crystallinity would have a huge growth and the content of phosphorus element on the surface of PBO-HM fibers would fall sharply.

Demand Side Energy Management System (DSEMS) manages energy demand by controlling end-use appliances in a refined, energy-saving, cost-efficient and user-friendly way. The DSEMS runs on an Android tablet computer, which serves as energy gateway to communicate with two types of controllers via ZigBee network. Smart sockets connected to the ZigBee network will monitor and control plug-in loads and IR remote controller (IRRC) for air-conditioner temperature setting. The proposed system has been installed in an apartment with over 24 rooms as a paradigm, which proved that the DSEMS can realize the autonomous energy-saving via real-time surveillance and control on household appliances.

Dongbei waterway in the lower reach of Yangtze River includes three waterway: Hukou waterway, Heng waterway and Zhi waterway. The evolvement trend based on the measured data show that the right branch of Xiasanhaozhou is developed and the shallow shoal at the head of Xiasanhaozhou is scoured along with the right branch be rushed and ratio of diversion flow increase which have negative effect on transition shoals. In order to analysis the effect of evolvement trend on the channel conditions of transition shoals, this paper adopt cognitive calculation on water flow of Dongbei waterway using mathematic model. The results show that, the development of right branch of Xiasanhaozhou and the shallow shoal cutting at the head of Xiasanhaozhou decrease velocity of transition sections, decrease the diversion flow of the left branch of Xiasanhaozhou, and increase the diversion flow of the head of Xiasanhaozhou which have negative effect on transition shoals.

Dongbei waterway in the lower reach of Yangtze River includes three waterways: Hukou waterway, Heng waterway and Zhi waterway. For a long time the documents about the evolution of measured data in based mainly on topographic information and it is insufficient materials actually measured about the character of water flow. In order to make up the incomplete measured documents, it is intended herein to make calculation of character of water flow by means of mathematic model. The results show that, there are overflows to various extents for the side shoal at Sizhouwei under different discharge. It appears crossing troughs in the left to the side shoal at Sizhouwei. The bigger flow velocity of lower shoal and its left rim is possible for being washed out.

Nitrous oxide (N2O) is a kind of important greenhouse gas,which has the potential damage on the ozone layer and people’s physical health. A series of RPSA loading metals catalysts were prepared by impregnation. The catalysts were characterized by XRD, TG-MS, NH3-TPD, SEM method. The catalytic performance for N2O decomposition was evaluated. Cu-based catalyst is the best activity for N2O decomposition, T95is 540°C.

This article presents the solutions for displacements and stress of layered generalized Gibson subgrade subjected to an axisymmetric surface load. We assume that the material has constant Poisson’s ratios (μ=0.5), and its shear moduli varies linearly with depth. During the solutions, the Hankel transform in a cylindrical co-ordinate system is employed. The relationship between the solution and half-space solution is also examined and discussed. At last, the analysis flow is presented .

Precast two-way hollow slab concrete shear wall is a new structure adapted to housing industrialization. To study the effect of the vertical joint on mechanical behaviors of shear walls, one reinforced concrete shear wall and two precast concrete shear walls built with hollow slabs were quasi-statically tested under low cyclic loading. The study of failure mode and failure process of specimens shows that vertical macro-cracks occurred in precast walls under loading, which made failure behavior of walls evolve from integral wall into split wall. It also shows that relative deformation formed along the vertical joint before peak load, so the ductility of walls is increased. New type shear walls exhibit good ductility and brittle shear failure can be avoided effectively.

In order to reduce the energy consumption and working procedure for manufacturing thin-walled titanium alloy components, a hot stretch-creep forming (SCF) technique via resistance heating is proposed to form the hard-to-form material. Firstly, the principle of hot SCF was introduced that the technique can manufacture titanium alloy components precisely because the residual stress relaxes in the material during the dwelling time. Secondly, the hot SCF equipment via resistance heating was developed, which makes use of electrical current for heating the titanium materials to improve their ductility. Then based on a set of optimized process parameters, including forming temperature, stretch velocity, post stretch percentage and dwelling time, a comparative experment of single curvature Ti-6Al-4V alloy sheet components was conducted via this innovative technology to examine the hot SCF equipments and the effect of creep forming. Results show that the component precision of the hot SCF is more precise than that of the hot stretch forming (SF) due to the creep in the stress relaxation period. Comparing to the as-received material, the yield strength of the material suffered hot SF decreases a little; while the strength suffered hot SCF increases a little. This novel technique shows a promising future to manufacture titanium sheet or profile components precisely as a feasible and cost-effective way.

The main bridge of Yunshi Hanjiang River Bridge is a prestressed concrete extradosed bridge with two pylons, a single cable plane and with span arrangement (128+238+128) m. The main girder of the bridge is the concrete continuous triple-cell single box girder of long cantilevers and variable sections, the box girder is 26.5m wide. The cantilever of girder is 5.75m wide as to reduce the self-weight of main girder. In the design, the software Dr.Bridge was used to establish the finite element model for the box girder and to carry out the global calculation of the girder lateral calculation. The software ANSYS was used as well to establish the finite element model for the segments of the main girder and to carry out the analysis of the local stress of the girder. The results of the calculation and analysis indicate that the global structure of the bridge is safe and reliable and the structure can meet the requirements for highway vehicle riding safety and comfort. No significant local stress concentration appears in the main girder, the stress amplitude values of the stay cables are within 30Mpa, and the structure can meet the requirements for durability in the process of service of the bridge. With long cantilever design greatly reduce the self-weight of main girder and saving cost, at the same time make the bridge look lighter and beautiful. The results of the analysis provide a reference for analysis on the shear lag effect and lateral calculation of the concrete continuous triple-cell single box girder of long cantilevers and variable sections.

It is described herein the general rule complied with by different forms of rivers by calculation of evolution trend of selected typical reaches of Ouchikou, Wakouzi and Yaojian which are appeared in the middle of Yangtze River, representing respectively the straight branch, minor bending branch and bending branch. The evolution for reaches of straight branches are mainly characterized with moving backward of side shoal by washout, increased swing of main flow, becoming shallow of riverbed and displacement of navigation trough. For minor bending branches, they generally have unstable water courses, frequently swinging thalweg, washout on head part and left and right rims of heart shoal and extended downward of deposit at the end. Because of reduced sand content, main courses and branches are in the trend of washout. As for bending branches, it is generally stable because of shore protection projects and the navigation condition is better than other type of river reaches unless there is sharp cutting of protruding side shoals.

Low cyclic loading tests were carried out for one precast two-way hollow slab shear wall with cast-in-situ boundary elements and one RC shear wall. The seismic performance of precast two-way hollow slab shear wall was analyzed. The test results indicated that macroscopic vertical cracks appeared along precast slab vertical holes of precast two-way hollow slab shear wall. The failure characteristics of the precast two-way hollow slab shear wall were significantly different from that of the reinforced concrete shear wall. Shear failure could be avoided and seismic performance of the new type shear wall was good.

With the capacity of wind power into power system increasing year by year, the impact of wind power characteristics (random and intermittent) on the system stable equilibrium is outstanding. To configure spinning reserve properly, this paper establishes a relatively complete optimization model of spinning reserve for power system with wind integrated. Using the similar samples to train prediction model, the precision of prediction is improved. The equivalent load duration curve (ELDC) considering load fluctuations and unit outage, is revised by analyzing the probability density of wind power prediction deviation. And the last, this paper gives an example to verify the theory.

The droplet aerosol generated by human expiratory (breath, cough, sneezing) is a major indoor biological pollutant and can lead to allergy, asthma, infectious disease and so on. The transmission of the droplet aerosol has a hugely influence on the health of occupants. This paper summarized the distribution and transmission of droplet aerosol generated by human expiratory, reviewed the factors which influenced the air transmission and the model of transmission of the investigated droplet aerosol. In addition, the current problem and future research about the human expiratory droplet aerosol in indoor environment were discussed in the paper.

The effective strain size and distribution of Al-5Ti-1B alloy deformed by equal channel angular pressing (ECAP) were investigated through the finite element simulation by the die with outer corner ψ=0°, 20°, 30° and the friction coefficient f=0, 0.2, 0.3. The simulation results show that the effective strains decrease with the increase of the outer corner ψ from 0° to 30° with a constant f; the more uniform deformation were obtained under the conditions of large friction than that of small friction. Al-5Ti-1B alloy was produced by once path ECAP at room temperature under the die with the corner angle φ=90° and ψ=20°. The optical microscope and compressing test machine were performed. The results indicate that the grain size was obviously refined. The yield strength increased by 37.5% from 142.0MPa to 195.3MPa, and hardness increased by 24% from 45.2HV to 55.9 HV.

According to the problem that the intelligence is not high of the soccer robot, using the mechanical theory as a guide, making some mechanical analyses and calculations on the pressure and transmutation states of chip kick mechanics, and conducting optimal design too, then making the structure of chip kick mechanics more and more rationalization. Experiments show that the new soccer robot controller features a quick response and high servo rigidity, and provide a kind of method for improving and perfecting the soccer robot control system, at the same time, filling the needs of producing.

Based on site investigation data and historical data of characteristic hydrological years in Tigris River, the natural conditions and sediment environment were analyzed, a 2D mathematical model of flow and sediment was used to analyzed the intake schemes in Wassit power station (4×330MW). The calculation results based on the data of flow and sediment in representative year show that the erosion and deposition will occur in the region of water intake engineering. So the reasonable design parameters related to water intake by pump vessel should be provided by designer.

The waterborne polyurethane (WPU) modified by epoxy resin was synthesized by using isophorone diisocyanate (IPDI), poly propylene glycol (PPG-1000), 2,2-dimethylol propionic acid (DMPA) and epoxy resin as the main raw materials. The WPU properties were characterized by TGA, FTIR, and so on. The study shows that whennNCO/nOH=1.4, the mount of DMPA is 5.0%, the emulsifying property of WPU which is modified epoxy resin with high epoxy value is well. And when the mounts of E-20, E-44 are 2.0%, 4.0% respectively, the synthesized emulsion with small size has well stability. The modified WPU which possesses high hardness, low water absorption, good heat resistance and anticorrosion, has a well combination property.

Chlorophyll fluorescence images of lettuce in four nitrogen levels were studied to investigate the influence of nitrogen on fluorescence parameters. The results indicated that, at seedling period, Fo and Fm declined with the increase of the amount of nitrogen fertilizer. Fv/Fm had a downward trend after the first rise with the increase of the amount of nitrogen fertilizer. And the influence of nitrogen on Yield, qp, qN were not obvious. At tillering stage, Fo, Fm were on a same level in every nitrogen level. Yield, qp and ETR decreased with the increase in the amount of nitrogen. At mature stage, in addition to in the severe lack of nitrogen level, Fo and Fm reached the maximum of the whole growth period. In the normal nitrogen amount, Fv/Fm, Yield, ETR, qp were high, but qN was very low.

The acrylic emulsion adhesive was modified by D4 and KH570 with chemical process, and we can get the modified product successfully via the best technology parameter which was confirmed by orthogonal experiment. The structure of acrylic was characterized by FTIR, while there was a comparative study on the macroscopic properties and thermal stability of the unmodified and modified product. The results showed that when m(D4):m(KH570) was 2:1, the dosage of emulsifier was 3.0%, the dosage of KPS was 4.0%, the monomer(soft and hard) ratio was 1:1, the stability of the acrylic emulsion adhesive modified by double siloxane was good, and its viscosity, water resistance, heat resistance were improved greatly.

In order to ensure the healthy safety of edible lettuce, an identification way of pesticide residues of lettuce leaves is studied. Soilless cultivation of lettuce sample was adopted. At tillering stage, various levels of fenvalerate were sprayed to different groups of lettuce, lettuce leaves accompanied by a collection of pesticide residues and lettuce leaves not sprayed pesticide residues were collected, Hyperspectral Information of each blade leaf were collected and lettuce leaves sample spectral library was set up. Randomly 90 samples were selected as training samples, and the classification models based on BP neural network and LVQ neural network were set up. The remaining samples were taken to forecast classification test. Results showed that, the prediction identification correct rate of LVQ neural network model is 98.3607%. The algorithm is suitable for pesticide residues diagnosis of lettuce leaves.

The objective of this study was to synthesize a new organic selenium compound, carboxymethyl chitosan-selenium (CMCTS-Se), and evaluate its antioxidant abilities on hydroxyl radicals and superoxide radicals. Sodium selenite and carboxymethyl chitosan (CMCTS) were used to prepare CMCTS-Se. It was characterized by ultraviolet (UV) and infrared (IR) techniques. The results proved the successful synthesis of CMCTS-Se. The yield was 44.78% and the content of selenium (Se) was 20.50mg/g determined by colorimetry at 420nm using 3.3-diaminobenzidine as color-produced reagent. The antioxidant activities on hydroxyl radicals and super oxide radicals of CMCTS-Se were investigated. The results showed that antioxidant activities were concentration related in the setting concentration range and the antioxidant effects of CMCTS-Se were totally better than that of CMCTS. The scavenging rates on hydroxyl radicals and superoxide radicals of 2.0mg/mL CMCTS-Se were 68.25% and 62.15%, respectively. VC, a well-known antioxidant, as a standard in our assay, showed a little higher antioxidant activity than CMCTS-Se. This research provides a possible application of CMCTS-Se as a low toxic and effective organic Se-enriched healthy product.

The shear wall built with precast two-way hollow slab is an innovated precast concrete shear wall suitable for housing industrialization. Two shear walls built with precast two-way hollow slabs were tested pseudo-statically under low cyclic lateral loads to acquire their failure process and modes. The effect of the axial compression load was investigated. The study proved that vertical cracks along the vertical holes of the new type shear wall have been appeared to avoid brittle shear failure, and the shear wall developed integral section wall to walls-columns combination. As the results, the shear walls have the adequate deformability. The test results showed that with the increase of axial compressive ratio, crack development has been limited and the energy dissipation capacity has been improved. It also can be found that with the increase of the axial compressive load, shear capacity of the new type shear walls have been improved.

In order to develop fieldwork car’s dynamic stability, a new control system for three-axle vehicle’s all-wheel steering is put forward. A nonlinear three degree of freedom (3-DOF) all-wheel steering model is built. The tire’s magic formula and the tire vertical load’s solving method based on displacement are applied to the model and the ideal yaw rate is given. Using feedforward and feedback control algorithm, a zero sideslip angle proportional feedforward and optimal feedback control system is designed. The system is simulated on MATLAB/Simulink platform and results show the vehicle’s dynamic stability is obviously developed.

Games have been shown to be highly effective in education. Consequently, game-based learning is attracting more attention from researchers. However, the existing game-based learning systems lack the effective learning method required to provide a proper review strategy for the enhancement of learning. This paper proposes a game-based learning system using the graduated-interval recall method to organize game contents and learning courses with appropriate review intervals according to learning status. The evaluations were conducted on the proposed system at Gwacheon National Science Museum in Korea with children visitors. The validity of the proposed system was verified by an analysis of the experimental data.

The addressing principle of distributed optical fiber Bragg grating (FBG) sensor based on frequency modulation continuous wave (FMCW) multiplexing technology was studied. The effect of grating position information, scanning time and scanning frequency range on the spectrum signals was analyzed by simulation. The FMCW multiplexing system, which was composed of the arbitrary waveform generator, light intensity modulator and multiplier etc, was established and the certifications were delivered by the experimental system.

A metalized FBG pressure sensor encapsulated by dual bellows structure was designed based on the strain characteristics of optical fiber Bragg grating (FBG) and osmotic sensing principle. And the experimental system of dual bellows FBG pressure sensor is established. The experimental results show that the pressure sensitivity coefficient of dual bellows FBG pressure sensor is 184.98nm/MPa with the measuring range 10 kPa. The correlation coefficient is better than 99.9% and the resolution is up to 0.05% full scale (FS). The sensitivity of dual bellows structure is high, which indicate that the dual bellows structure encapsulation is suitable for the sensoring in small measuring range.

The bandwidth and the dynamic range is the critical performance parameter of IF AGC (Intermediate Frequency Automatic Gain Control) in wireless receiver. In order to design broadband and large dynamic range IF AGC circuit, the main functions and performance of the VGA (Variable Gain Amplifier) AD8367 and the logarithmic amplifier AD8318 are analyzed. A kind of a broadband large dynamic range IF AGC module is designed by using these two chips. Detail circuit is provided; key technology of AGC module is analyzed and the actual testing results are offered. Compared to the traditional AGC circuit, the module is simple; it has small size and obvious advantages in broadband and large dynamic range.

The rapidly increasing usage of high-powered devices and the high specification in personal and industrial/medical devices has led to a greater demand for a SMPS for high-powered devices. A stable and reliable power source for such devices and research on power quality monitoring systems are needed. To these ends, this paper introduces a SMPS monitoring system based on ZigBee communication. The SMPS monitoring system uses ZigBee to collect the voltage, current, and temperature data from SPMS in real time. The collected data are visually synchronized and the current power supply status is displayed to the operator. In addition, to prevent any decline in the quality of the power, the system gives feedback via smartphone to the operator if errors are detected.

The objective of this study was to synthesize a new organic selenium compound, chitooligosaccharide-selenium (COSSe), and evaluate its antioxidant abilities on hydroxyl radicals, super oxide radicals and DPPH in vitro. Sodium selenite and chitooligosaccharide (COS) were used to synthesize COSSe by chemical method. The yield was 37.26% and the content of selenium (Se) was 9.02mg/g. COSSe was characterized by ultraviolet (UV) and infrared (IR) techniques. The results proved the successful synthesis of COSSe. The antioxidant activities on hydroxyl radicals, super oxide radicals and DPPH of COSSe were investigated. The results showed that antioxidant activities were concentration related in the setting concentration range and the antioxidant effects of COSSe were totally better than that of COS. The scavenging rates on hydroxyl radicals, superoxide radicals and DPPH of 2.5mg/mL COSSe were 71.19%, 64.54% and 69.78%, respectively. This research provides a possible application of COSSe as a low toxic and effective organic Se-enriched healthy product.

Today, in order to enrich economic and scientific research value, sensor network and its data management system have been widely used in ocean observing and in real-time continuous data collecting. In this article, the risks associated with modeling, assessing, managing, and communicating of observing systems are taken into consideration, a cyberinfrastructure architecture is designed to ensure the global observation networks real-time, integrated network research and mass data analysis, with its base station communications, satellites and cables to transfer data, using distributed computing platform for real-time analysis of mass data of worldwide sensors to obtain the new progress of research topic and provide disaster warning. This is important to allow researchers study collaboratively with other researchers as if in their laboratories, also cause the public to further contact with sea world, and widen the public education road.

In order to further study the mechanism of adaptive-slit shear walls under horizontal loads, and facilitate it better applied to practical engineering. On the basis of experimental studies, the ABAQUS finite element analysis software is used to establish the finite model of adaptive-slit shear. The finite element model accuracy is verified by comparing the model and test results. A validated model is used to study the mechanical property of adaptive-slit shear walls under monotonic loads.

The cumalant-based RLS algorithm with variable forgetting factor is introduced in this paper as effective approach for tracking the voltage flicker envelope. The improved RLS algorithm uses the fourth-order cumulant-based mean-squared-error (MSE) criterion in place of correlation-based MSE criterion, in order to suppress the Gaussian noise. For tracking nonstationary voltage flicker waveform, variable forgetting factor (VFF) can be applied to adjust the tracking performance and convergence performance of algorithm. Two cases of flicker with constant amplitude and frequency and varying amplitude and frequency are used to verify the performance of algorithm.

This paper analyzes the convergence deviation of surrogate assisted (1+1)EA. A model of surrogate assisted (1+1)EA can be built by the finite markov chain, then we got the transition matrix of this algorithm. The deviation of surrogate model can be expressed by the perturbation of transition matrix. So we can estimate the convergence deviation with the method of matrix perturbation analysis. Analyzing of the convergence changes brought by surrogate model’s deviations can help us to have a better select of the surrogate model.

The heat sink has played an important role in the thermal design of high power LED lamps. In this study, a pin-fin heat sink is designed for the 3-chips high power LED down-light. Thermal performance of pin-fin heat sink is researched by changing the fin height, fin number and lamp’s irradiation angle. Simulation results gotten by CFD software show that the pin-fin heat sink has better thermal performance with fin height of 40mm and fin number of 75. The LED down-light with a pin-fin heat sink has a better cooling effect in multi-angle irradiation. The results provide a reference for future design of pin-fin heat-sink.

The waterway of Jiangxinzhou to Wujiang section is the only hindering navigation section in Wuhu to Nanjing of the lower reaches of the Yangtze River. Because of the unsteadiness of the main stream, the navigation condition in this section tends to worse, in which the regulation work is sorely needed and more important. The major problem for channel regulation in this section is the design of regulation project. In this paper, the 2D numerical model for simulating the flow and sediment in the waterway of Jiangxinzhou-Wujiang section is used to analyze these questions. From the numerical simulation results, we know that the overall navigation regulation project can solve the problem of hindering navigation.

To establish the model of wireless sensor network reliability, the sensor nodes’ reliability was assumed to be exponential distribution. By the methods of MLE and K-S , reliability distribution function of sensor nodes was verified in line with two parameters Weibull distribution . Basing on experimental dates , reliability distribution function of sensor nodes accorded with two parameters Weibull distribution and exponential distribution were in Eq.9 and Eq.10. Comparative results in Fig.5 shows that the two parameters Weibull distribution exceeds the exponential distribution to describe the distribution of sensor nodes.

In this paper, we adopt theoretical method to study the evolution characteristic of the two dimensional turbulent vortex structures in a meander channel. The disturbance growth rates under different bank curvatures are simulated. The result showed that the change of growth rate of smaller vortices is more intensive than bigger vortices. Future more, we consider the coherent vortex structure as a kind of disturbance to study the evolution characteristics of multi-scale turbulent structures in a meander channel, make basis for finding “meander channel-forming vortices” which is controlling the river shape and adapt to the meander river in theoretic.

Through the data acquisition system of drop impact test impact excitation pulse and in response to a pulse, to reduce or eliminate the experimental process generated interference signal brought influence, the excitation and response signals are Fourier transform (FFT), get the cushing material power spectrum and cross spectrum density value, the time domain signal into frequency domain signal, realize the effective filtering, the frequency domain signal in each frequency through the transfer rate calculation formula of cushing packaging material transient vibration transmitting rate, the transmission rate of the way the process of obtaining description and theoretical analysis.

Cold-drawn pearlitic steel wires are widely used in numerous engineering fields. One of the most powerful analysis methods on determining the dislocation character of this heavily cold worked material is to investigate the X–ray diffraction line-profile broadening. Fourier line–broadening analysis in steel wires with near eutectoid composition indicates that with cumulative true strains, the initial dislocation density of 6×1014m-2in the rods increases at least one magnitude in wires. Up to 1.5×1016m-2of dislocation density is found in the ferrite lamella of wires with a true strain of 2.77.

The author performs simulation analysis on construction process of roofing prestressed concrete beam of comprehensive service center in Beijing Institute of Civil Engineering and Architecture by finite element software Midas/Gen, so as to determine the monitoring programme according to the analysis results. The monitoring results indicate that the structure is safe; the theoretical value of simulation analysis is well matched with actual monitoring value, which means that the finite element model of construction process of roofing prestressed concrete beam is correct, the simulation method is feasible and the construction process is reasonable. It has important reference value for construction and monitoring of subsequent similar projects.

Experimental studies showed that vertical cracks appeared along the cold-formed steel or the steel sheet on the adaptive-slit shear walls when the wall was subjected to horizontal earthquake loading, and the adaptive-slit shear wall experienced the loading process from the whole wall section to the slitted wall section. So the appearance and development of the vertical cracks can reflect the seismic behavior of adaptive-slit shear walls. According to the mechanical characteristics of the adaptive-slit shear walls, this paper proposed a method to calculate the cracking load. It is found that the calculated results has a good agreement with the experimental results.

Through exposure test of FRP-reinforced concrete member in littoral test area of temperate marine zone, the durability and constructional measures of FRP-reinforced concrete structure are investigated. The test results show that FRP shell on the surface of FRP-reinforced concrete member is effective in avoiding wave flush, freezing and thawing damage, preventing chloride ion corrosion and improving durability. On the other hand, reliable measures should be taken to protect concrete structures with no FRP shell on the surface. Based on above, the provided reference for evaluation durability of FRP-reinforced concrete structure, and proper constructional measures for FRP-reinforced concrete structure are presented.

The epoxy acrylate emulsion was made by hybrid emulsion polymerization. This method has simple technology, none solvent and friend to the environment. The epoxy acrylate hybrid emulsion was prepared by using core-shell emulsion polymerization technology. The factors, such as epoxy resin, emulsifier ,initiator and functional monomer, were investigated by the orthogonal experiment. The relation of interactional factors was confirmed, and one kind of steady emulsion was made. The best formulation condition of modified emulsion could be obtained when N-MA was 1%, MAA was 2%, emulsifier was 3%, epoxy resin was 6%, initiator was 0.6%. The structure of modified styrene acrylic hybrid emulsion was characterized by FT-IR, the peaks at 915cm-1 and 1251cm-1 correspond respectively to the motion of epoxy group and phenylate, so the graft polymer was confirmed.

The hygroscopicity property of the rapeseed at different temperature and humidity was experimental studied in this paper. Tested results show that: the moisture absorption rates increase with the increase of relative humidity at the early period of absorption, and higher temperature leads to earlier reach of moisture equilibrium; the critical relative humidity(CRH) increases with the increase of temperature; the optional relative humidity for safety storage of rapeseed should be controlled less than 60%.

A method of wheel load variation simulation for automobile ABS performance test bench is presented in the paper. To simulate the wheel load variation of the detected vehicle, the wheel placement angle on the rollers can be changed by adjusting the wheelbase between the ABS performance test bench’s two rollers, which support the same wheel. Equivalent wheel load is defined to reflect wheel load variation simulation, and the relationship among the equivalent wheel load, roller adhesion coefficient and wheel placement angle is also be analyzed. The simulation results show that the equivalent wheel load is not only can greater than wheel load many times, but also can less than wheel load. The minimum equivalent wheel load is determined by the critical wheel placement angle.

As the economics developing, the traditional design can not meet the changeable customers demand. So the research on methods of new products design becomes valuable. In this paper, the methods of shoes style creation design were discussed. On the base of knowledge, several kinds of methods were put forward to realize shoes style creation design, including exciting creation-intelligence encouragement, expanding creation thought and way, analyzing style, reverse design, series design by analogy and judgment and part modification, reference and association. And a standard for shoes style creation design was also raised. The research mentioned above offers a new thought of shoes style creation design.

Under the background of the combination of design and management, the meaning and the role of design management are summarized. With the extensive application of information technology, a product design management system model based on information technology is proposed. The basic frame and the basic ideas of the system model are analyzed. The main technologies used by the new design management system are discussed. In a word, the new product design management system will be strategic resources and an inevitable choice in the process of developing new products

The performance of speed regulating is very important to the mixing process with safe, efficient operation and high quality of production. Strategies and practices of responses and optimization of a PID-based speed regulating system of a planetary mixer were presented in this paper. Research results show that: by means of the signal constraint function presented by Simulink Response Optimization, optimization PID parameters of the 2-DOF-PID controller can be obtained, and the response of close-loop control system has quite good performance of overshoot, response time, and stability compared with an open-loop control system.

Hydraulic drive mixers are widely employed to process the cohesive mixture, especially the energetic mixture. According to the mathematic models of main links of the speed regulating system of a hydraulic drive planetary mixer, a simulation model for the system was presented in this paper. The load and impulsion have impacts on the speed response of the speed regulating system with good performance of stability. The converted rotary inertia of the hydraulic motor has a two-sided impact on the speed regulating system, namely impact the response and the overshoot performance at the same time. And, the leakage of the hydraulic drive system often has a bad impact on the speed response of the regulating system.