Search

In this paper, NixCo3-xTiO4 nanowire as anode materials was prepared by co-deposition method, and the characterized results showed that had good crystallinity by SEM. The cobalt and nickel were enriched in the surface in the sample by XPS. The catalytic performance of NixCo3-xTiO4 was studied by cyclic voltammetry and constant potential. The results showed that when the Co: Ni = 4:1, the temperature was 120°C, NixCo3-xTiO4 nanowires had high catalytic activity and good stability by the cyclic voltammetry and the steady state polarization curves.

The influence of different factors in the alcogel preparation process and ambient pressure drying process on packing density of hydrophobic TiO2 aerogel synthesized by ambient pressure drying (APD) and the optimum preparation conditions were investigated by the orthogonal test with four-factor and three-level L9(34), respectively. The morphology and structural properties of hydrophobic TiO2 aerogels with different density were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetry (TG), N2 adsorption-desorption measurement and Scanning Electron Microscope (SEM). The results showed that the most important factors in the preparation process for TiO2 aerogels with low-density under ambient pressure are aging time, the volume ratio of C2H5OH to TBT, ethanol immersion time and hydrophobic modification time. The optimized preparation conditions are that aging time is 24 h, the volume ratio of C2H5OH to TBT is (7+7) : 5, the volume ratio of H2O to TBT is 1.7 : 5, the volume ratio of HAc to TBT is 1.7 : 5, ethanol immersion time is 24 h, hydrophobic modification time is 48 h, hexane solvent replacement time is 24 h and the drying temperature is 393 K. TiO2 aerogels with density of 460 kg/m3 was obtained at the optimized conditions. TiO2 aerogel with lower density displays higher specific surface area, porosity and pore volume as well as the larger pore size.

When offshore oil field has been completed and put into production, the new subsea pipelines and cable will need to be established. Cable protection pipe clamp is used to fix cable protection pipe on the jacket. In order to avoid the problem of traditional steel structure clamps which was difficult to joint, align and fasten when it installed cable protection pipe underwater, reduce the risk and workload underwater, This paper will study a new type of portable connecting riser clamp made of resin matrix composites which can solve the installation problem which is difficult to install cable protection pipes underwater. The main structure of pipe clamps made of resin matrix composites used three divided-plates type of structure. The load characteristic of clamps was determined by Morison equation which is a classical theory and clamps underwater mechanics analysis model was established. The results show that the strength of the base of clamps meet the requirements after strength analysis with finite element analysis method, stability and strength experiments, which means the clamps made of resin matrix composite is feasible.

The flow stress behavior of the 7085 aluminum alloy was studied through single-pass compression experiment by using MMS-300 simulator within temperature range of 300-450°C and strain rate range of 0.01-10s-1. Dynamic recrystallization occurs in hot compression of 7085 alloy and the stress-strain curves are presented as wave with higher deformation temperature and strain rate. Increasing of deformation velocity and reducing temperature results in higher peak stress. Then a mathematical model has been developed to predict the stress-strain curves based on phenomenological representation of the curves and the traditional theories for constitutive equations which incorporate the power law. The constitutive equation expressed in terms of peak stress, peak strain and additional parameters to predict flow stress. The stress-strain curves of 7085 alloy predicted by this model are in good agreement with experimental results.

In order to make on-line monitoring on the temperature of high voltage switch circuit breakerand find outthermal fault in time. This paper puts forward a new method with radio frequency and magnetic saturation power supply technology to make on-line monitoring on the temperature of high voltage switch circuit breaker, it designs the high voltage switch circuit breaker contact temperature online monitoring device. The device mainly includes monolithic temperature collector and data receiver, they transmit data wirelessly, and this makes high temperature monitoring terminal and the data receiving terminal completely electrical isolated. Integrated temperature collector doesn’t need external power supply, it uses small CT saturation technology for continuous power. The experiment shows that the temperature error is ±2°C, it can meet online temperature monitoring requirements of high voltage switch circuit breaker contact.

The top slag reforming in RH refining process was studied in this paper to decrease inclusion and improve the deep drawing property of Ultra-low carbon cold-rolled steel. Different experiment schemes of top slag reforming were conducted and the result show that, when Al40 was added on the surface of the slag after the ladle reach station uniformly, the size of inclusions was decreased and the quantity of large-volume inclusions was obviously decreased, and the top slag reforming will not have big impact on decarbonization in the RH refining process.

The phytoplankton community were investigated at Xingkai Lake in July and August 2011. The results showed that there were 31 species belonging to 5 phylum of phytoplankton in Xingkai Lake. In the detect, 10 species (32.29%) of Cholorophyta was found. Cell density in Dangbi town and Lake center was 1.592×106ind./L and 1.562×106ind./L respectively. Cell density of Cyanophyta was the highest, and the dominant species were Merismopedia tenuissim, Anabaena sphaerica and Phormidium anomala . Shannon-Wiener index of samples in the two places were 2.85 and 2.86 respectively, and Margalef index were 1.59 and 1.27 respectively. It showed that the type of water was mesosaprobic-heavy pollution type, and we should pay attention to the water pollution.

Bamboo as the raw material is carbonized to prepare high specific surface area activated carbon by microwave heating under nitrogen atmosphere in our present work. Influences of activation agents on the preparation of activated carbon are studied. The results show that activation agents have a significant influence on the preparation of activated carbon. Under the heating time of 15 min, the adsorption capacity of the activated carbon prepared utilizing KOH as activation agent is the best. When the KOH/C ratio is 4, the iodine number and yield of activated carbon are 2298 mg/g and 39.82%, respectively. The BET specific surface area, total pore volume and average pore diameter of activated carbon are 3441 m2/g, 2.093 ml/g and 2.434 nm, respectively. The micropore volume of 1.304 ml/g is 62.30% of total pore volume, indicating that the activated carbon is microporous activated carbon.

The ship-borne satellite earth station was studied to establish a hardware-in-loop simulation system for employee training. Preliminary demand analysis for staff of all levels shows the complexity of this system. Based on the distributed simulation theory of HLA, system framework and implementation approach was proposed. Key technologies for modeling and simulation of ship-borne satellite earth station were discussed in this article. Subsequently the block diagrams of device simulator and simulation agent were clearly described. Finally the specific steps of operation were created to show the details of actual running process, which prove the feasibility of this system.

Rural land consolidation has a profound impact on the changes of landscape pattern. In this paper, the author took the Haiyan County for example. Using GIS technology as well as theory and methods of landscape ecology, the author studied landscape pattern of land consolidation by selecting 15 indicators, including landscape structure characteristics, patch characteristics, corridor characteristics and characteristics of matrix into the land use situation and landscape pattern before and after land consolidation, analyzed and summarized the rural land consolidation to the influence of landscape pattern. Then the author put forward measures of rural land ecological construction. The results also show, rural land consolidation on the impacts of landscape pattern has two sides, hence should make full use of its positive effect and take some measures to reduce its influence.

Engine energy-saving technology is the key direction of passenger car energy-saving. This paper has built energy-saving potential model, which could forecast the potential of engine energy-saving technology in 2015 and 2020 under such two constraints: overall target requirement of fuel consumption and curb weight range. Afterwards, the model was used to calculate energy-saving potential of narrow sense passenger cars (including basic car + SUV + MPV), which were equipped with single turbo charging technology, single GDI technology and the above two kinds of technologies integration. The research results will provide decision-making support for enterprises’ technology selection and product development.

The basalt fiber is a new kind of high-performance environmental material, which has aroused widespread concern in recent years. Although it has been preliminary applied in construction, aerospace, national defense, petrochemical and other fields, there is few study in the field of environmental protection, especially in the water pollution control. This paper summarized the characteristics of basalt fiber and introduces the technology application programs in the centralized sewage water treatment, natural water body purification and as a catalyst carrier material used in the wastewater treatment. In order to enable basalt fiber to obtain further application in the area of water pollution control, correlated suggestions were put forward at the end of this article.

Based on the finite element software ABAQUS, this paper deals with numerical simulation to dynamic response of reinforced concrete wall under blast loading. Study shows that the explosion resistance performance of the wall with four edges fixed or with two opposite edges fixed are better than that of the wall one edge fixed and another opposite edge simply supported. The greater the explosion impulse, the bigger the maximum displacement of the wall. When reinforcement ratio of the wall increases, the explosion resistance performance of the wall will be improved. At the same time, reasonable reinforcement and external conditions should be made sure. Keywords: Blast Loading, Numerical Simulation, Shear Wall, Dynamic Response

With the recent deterioration of air quality in China, different degrees of haze occurred in most areas in China, which has seriously affected the physical and mental health of the residents and greatly limited the daily production operation. Therefore, the analysis of the contributing factors and the control of haze are imminent.

Based on wind speed data of 13 meteorological stations in 1958-2012,Mann-Kendall nonparametric test methods was been used to study on wind speed changes in Hexi Corridor.Spatial and temporal characteristics of seasonal and monthly wind speed changes was examined. (1) The maximum wind speed appeared in the higher elevations of study area, such as Wushaoling and Mazongshan station. From east to west mean wind speed increased in Hexi Corridor.For nearly 50 years wind speed had showed decreasing trend. (2)In each season Spring with an maximum mean wind speed was 3.4m/s,the Summer mean wind speed was 2.9 m/s,Autumn mean wind speed was 2.6 m/s,the mean Winter wind speed was 2.8m/s.The seasonal wind speed mainly had decline trend, each station.has different characteristics trends (3) Mean wind speed in each month was greater than 2.5m/s,maximum monthly wind speed appeared in April was 3.5m/s,the minimum wind speed appeared in the September-October was 2.53m/s,the wind speed in March,April and May was greater than the November month,December,January.In addition to Mazongshan and Wushaoling,other station monthly wind speed showed a decreasing trend.Monthly mean wind speed in Jiuquan,Dingxin and Zhangye was slow decreasing trend.Anxi,Yumen wind decreasing trend were more obvious.(4)Wind decreasing trend will have a significant impact on wind energy, wind speed changes and wind energy should be evaluated in the future.

PANI coating was electrochemically synthesized by cyclic voltammetry (CV) method on the surface of 316L stainless steel plate. The surface morphology of PANI coating was observed by scanning electron microscopy. The effect of oxygen gas on corrosion behavior of PANI coating in PEMFC environment was investigated. The corrosion performance of the coating was evaluated by potential-time curve and polarization curve as well as electrochemical impedance spectroscopy in a bath containing 1M H2SO4and 2ppM NaF, and the air with a flow rate of 10 ml/min was piped into the testing corrosion cell to simulate the positive cathode condition of PEMFC at 70°C. The potential-time curves illustrated that oxygen gas resulted in the potential decline towards negative direction. Polarization curves showed that corrosion potential of the sample with O2was lower than that of the sample without O2, and the corrosion current density was higher than that of the sample without O2. EIS results indicated that the Nyquist plots were constitute of a capacitive impedance arc and a incline line, and the oxygen gas reduced the anti-corrosion performance of the PANI coating.

Rice root proteomics research identified to a new remorin1 protein,named OsREM1,which significantly increased (approximately 1.7-fold) compared with control under salt stress by Two-dimensional electrophoresis. It is found that the protein molecular weight is 29 kD, isoelectric point is 4.54. The bioinformatics analysis showed that: (1) The protein contains 195 amino acids, whose theoretical molecular weight is 21.3 kD, whose theoretical isoelectric point is 5.06. There are some differences with the experimental results, which may be the result of post-translational modification, such as glycosylation, phosphorylation; (2) The different crop remorin protein sequence alignment analysis found that the same rate of the amino acids is more than 50%, indicated that remorins are highly conserved protein; (3) Phylogenetic analysis showed OsREM1 had a low sequence identity with potao and tomato REM1, which is the agreement with traditional classification.

In the context of the new urbanization, ensuring ecological security of land use is one of the most basic prerequisite for ecological civilization construction. This paper is based on the theory of ecological footprint, and use ecological pressure index to evaluate the state of land-use ecological security of Yiwu City, Zhejiang Province. The results indicate land ecological pressure indexes increasing from 2.5912 in 2008 to 2.8029 in 2012 are gradually on the rise in Yiwu City. The deterioration of land-use ecological security is exacerbating. Finally, suggestions improving ecological security of land use are proposed from arable land protection, energy saving, and ecological and environmental comprehensive management.

Based on NEWTON and dynamical analysis the half car model is built, in which air spring is a nonlinear system on the basis of force model and the shock absorber has soft and hard states. By the simulation of the model and combination with experiments, the model is proved right and the influencing factor of angle-displacement and acceleration of body can be gained. Then with the application of genetic algorithm in Matlab tools, appropriate control parameters is being set, the above-mentioned model can be optimized, results of optimizations will be compared with three ride comfort evaluation indexes before optimizations. By judging the corresponded extents of curve before and after optimizations, it shows that the parameters after optimizations can improve the ride comfort.

In order to improve the spinnability of flax fiber during alkali treatment and save reagent, the effects on the properties of flax fiber are studied under the condition that both ultrasonic and NaOH reagent. It was observed that in the process of alkali treatment to flax fiber, it was better than use ultrasonic when it comes to the length, splitting degree and short fiber content. During the process of alkali treatment, the processing effects were good when the temperature was 50°C, time 30min, frequency 28kHz, concentration of NaOH 10%. Not only the spinnability of the flax fiber is improved with the use of ultrasonic, but also the problems high consumption of time, and pollution are solved.

The problem of the urban water shortage and water pollution is becoming problem more and more serious. Therefore, governments around the world pay close attention to the application of sewage treatment technology, especially that with high efficiency, low energy consumption and strong operability. Dielectric barrier discharge (DBD) can produce low temperature plasma under atmospheric pressure, and the application of the technology for sewage treatment research gradually becomes to be one of hot research. In this paper, the dielectric barrier discharge structure is designed, and the plasma produced is used for sewage treatment research. The system adopts coaxial type discharge structure. The research shows that the structure is safe and reliable. And, it has low discharge power and can discharge uniformly. So, the plasma produced by dielectric barrier discharge can be convenient and easy to used in sewage treatment, and the result is effective.

This paper presents a system of audio signal processing based on FPGA,the system uses audio codec chip LM4550 to A/D transform and D/A transform the input analog audio signal and output digital audio signal.Using FPGA as the high speed signal processor to realize volume adjustment and audio effect control,so it can output different style music.Meantime, the system designs a FFT computing module and control system of VGA display interface,to compute the digital audio signal which is A/D transformed,and real-time display the frequency spectrum of audio signal on VGA.

The teaching mode of cramming education in College Sports Professional theory teaching appears in major universities. Along with the progress of society and the development of the teaching quality, the initiative of students is growing and the traditional mode of education could not better coordinate the role and communication, which impedes the cultivation of students' personality. The author preliminarily discusses and understands it by the application of multimedia technology in college PE Teaching Theory.

Experiments on the catalytic pyrolysis of corn stover and catalytic reforming of pyrolysis vapors were conducted in a tubular fixed-bed reactor. The influence of reaction temperature, pyrolysis catalysts, dosage of pyrolysis catalysts and dosage of reforming catalysts were investigated. The results showed that with the increase of reaction temperature, the oil and char yields decreased and the gas yield increased. The highest-quality bio-oil was achieved at the reaction temperature of 400 °C, and dolomite showed a best performance on the biomass pyrolysis compared to other catalysts. Besides, When the dosage of pyrolysis catalyst was 1 g, the relative content of aromatic was 43.92 wt% and the relative content of acids was 47.58 wt%, and when the dosage of reforming catalyst was 2 g, the relative content of aromatic was 34.1 wt% and the relative content of acids was 58.7 wt%.

Phase change thermal control technology has gained increasing focus as an emerging technology for the thermal control of spacecraft. This literature focused on melting process inside a latent heat energy storage filled with phase change material (PCM) by numerical simulation. A matrix-based enthalpy porosity theory in a three-dimensional finite volume discretization is simulated. The temperature distribution during the melting process of PCM Cerrolow-136 and CH3COONa·3H2O is obtained, based on which the thermal control function and energy storage capacity is compared. The results show that Cerrolow-136 has better performance. In different states of phase change, the temperature distribution of Cerrolow-136 is fairly uniform. Thermal control face's temperature of Cerrolow-136 is closer to phase transition temperature. In the same heat flux of 3000 W/m2, The whole process of thermal control temperature getting to 80°C for Cerrolow-136 is longer. Cerrolow-136, for its excellent characteristics, has potentially broad application in the fields of latent heat energy storage and space vehicle electronics.

In this paper, a novel low molecular weight poly (γ-glutamic acid) hydrogels were prepared by chemical method, and their preparation conditions such as poly (γ-glutamic acid) and crosslinker concentration, pH and temperature were studied. When poly (γ-glutamic acid) solution was 18%, pH 4.0, poly (γ-glutamic acid) was crosslinked to yield high water hydrogel with specific water content of 1328 times their dry volume depending on the preparation conditions.

A gear-linkage mechanism, composed of a planetary gear mechanism and a four-bar mechanism, has the characteristic of step-cyclical output rotation under a reasonable geometric parameters. The analysis of stepping movement of the base unit and the motion characteristic of the combined mechanism was made, and the parameter equation was figured out. Motion simulation was carried out to analyze the influence of transmission ratio on the variation of the output shaft angular displacement, which proved that the output steps was in correspondence with , and as value of increasing, the rollback of the output motion was more apparent. The gear-linkage mechanism can be applied to engines, pumps and compressors.

In order to find out the recharge source of the leakage water that appears behind the right dam of Suzhi hydroelectric station located in Qinghai province of China, water samples of the leakage water, groundwater in the seepage observation wells, reservoir water and local precipitation are taken for isotopic composition analysis. Stable isotopes of the leakage water behind the dam have significant differences with local precipitation, indicating that the leakage water should not be recharged by precipitation. Isotopes of water in the seepage observation wells and reservoir water scatter around the same evaporation line, which implies that well water comes from reservoir water recharge. Leakage water behind the dam probably originates from the leakage of reservoir water as the stable isotopes of leakage water approximate those of well water and reservoir water.

Coal slime in Zhongcheng coal preparation plant in Baotou, Inner Mongolia, was analyzed. It is found that this coal sample is with high inner ash content and very difficult to float. It is hard to obtain low ash concentrate and high ash tailing with primary flotation. The live scale required ash content is 12.00% for total clean coal, 15.00% for flotation concentrate. It is found that the lowest concentrate ash content is 29.24% through exploring flotation experiments, which can not meet the producing requirement. Results of timed release flotation experiment show that when concentrate ash content is 15.00%, the theoretical concentrate yield is 24.36%, with 50.03% of flotation tailing ash content and 35.49% of combustible matter recovery. It can be concluded that the floatable grade of this coal sample is Very Difficult to Float. So flotation column is taken into account. The lowest concentrate ash content of roughing flotation by flotation column is 18.94%, which does not meet the requirement, either. Results of cleaning flotation of roughing flotation concentrate show that when the recycling pressure is 0.14 MPa, the concentrate ash content is 14.15% with a yield of 30.39%, which is satisfactory and can be referred to direct industrial production.

With the rapid development of coal mine resources, heat harm in deep mine is one of the key problems to be solved in our country. In this article, through analyzing the different heat sources of the mine,we get the calculation model of airflow temperature which is related to the different feature points of shaft , horizontal and slant roadways and extraction working areas.We also take the actual geological conditions into consideration and build simulation system in coal mine to imitate and budget the airflow temperature and air amount in roadway which is at different ventilation system conditions. And it can provide theoretical and technical basis for the optimization scheme research of mine ventilation system , the ways to choose the mine refrigeration system and installation position of air cooler.

Er3+-Yb3+ co-doped ZnO-B2O3- SiO2-TiO2 transparent glass ceramics were synthesized by melt crystallization technique. Samples were characterized by DSC, XRD, SEM, UV-Vis-NIR and fluorescence spectra and the factors affecting the crystallization of glass ceramics were analyzed. The results indicated good crystallization property of ZBS glass ceramics. The optimum crystallization temperature was 800°C, and crystallization time was 60 min. The main crystal phase was Zn2TiO4 and the transmittance was up to 70% in visible light region. SEM micrograph indicated that the grain diameter was less than 100nm and the emission spectrum of glass ceramics displayed by fluorescence spectra was greatly improved compared with matrix glass. Strong emission peak was observed at 1535nm.

In order to understand the sedimentary characteristics of shale and prospects of shale gas exploration in the lower Silurian Longmaxi Formation northern of Guizhou Province, outcrop and core observations, thin sections, X-ray diffraction analysis and other means are used. Studies show that the thickness of Longmaxi formation shale is generally large, range from 20m to 200m, mainly develop in the water shelf. The mineral mainly compose of detrital quartz and clay minerals, and five lithofacies can be identified: black shale, silty shale, carbonaceous shale, calcareous shale and argillaceous siltstone. Longmaxi shale kerogen type is mainlyIand II, and Ro value is average of 1.87%, mainly in the mature - over mature stage. In addition, the TOC content and gas content of Longmaxi shale is high, what’s more, these two parameters have good positive correlation. Compared with the Barnett shale, both of them have some similarities in the development environment shale, shale thickness and type of organic matter and TOC content, while, Longmaxi shale is deeply buried and post-destruction more intense. Longmaxi shale sedimentary environment is stable, high shale thickness and stable distribution, good quality source rocks and high brittle mineral content, which has meet the basic parameters of shale gas exploration and development, and has a large shale gas exploration potential in study area.

According to the spinal anatomy data, three-dimensional geometric model of human lumbar spine L3-L5 segment is established in this paper. In the model, the vertebra is divided into cortical bone, cancellous bone, endplate and other structures. The connection between the vertebrae and intervertebral disc is simulated as contact joint. The material properties of lumbar parts of the structure are not the same, the elastic modulus is changing in the analysis. Based on the model, the deformation of the lumbar spine under different size of axial force and lateral torque is simulated. The simulation result shows the variation regularity of the deformation of vertebrae and intervertebral disc under the condition of different pressure. This research provides a quantitative reference for spinal bio-mechanics. The human spine model with a gradient change sets the foundation for processing field of artificial joint using the 3D printing technology.

In this paper, the flow calculation problem of wind power connected to the grid was researched and the corresponding models were put forward.According to the relationship between the node voltage and reactive power of wind farms, modified the jacobian matrix.Implement and trend of the expression for calculating and according to the relationship between the node voltage and reactive power of wind farms, to modify the traditional methods of jacobian matrix and axle and consistency.Finally through the IEEE - 14 standard system, to verify this model and algorithm in this paper, satisfactory effect was obtained ,also laid the foundation for the further research.

Due to the complex geological conditions of Nanshan mine east region, the outburst predict index overrun frequently in the process of high-dipping extremely thick coal seam rock cross-cut coal uncovering, this text designed and optimized the front explore borehole parameter to ascertain conditions of coal seam; Optimized gas drainage drilling parameters to improve the rate of extraction, reduced the blank tape; On the basis of the theory of mechanics, derivate the computational formula of minimum safety rock pillars, identified with the minimum thickness safety of rock pillars. Through the above measures, guaranteed debunking coal seams quickly and safely.

fasciatedandlcloci controlled locule number of tomato fruit. The candidate gene offasciatedloci had been cloned thelcloci was also been fine mapping and two single-nucleotide polymorphisms (SNPs) located nearWUSCHELwere found to be responsible for locule number. But whetherWUSCHELwas the candidate gene oflcloci had not been known. In this study, we analyzed the expression ofWUSCHELin tomato with different locule number and under high and low temperature. The result showed thatWUSCHELexpressed higher in FL1 which fruit with 2-4 locules than in MLK1 with 15 locules. We identified theWUSCHELmight be candidate gene oflcloci.

Universities build college student entrepreneurial base. So they can encourage students to start a business and cultivate entrepreneurial talents. It plays an important role in alleviating the employment pressure of our country, cultivating the creativity of the young people, and promoting the transformation of scientific and technological achievements of universities. In this paper, we will discuss the applied technology in management and construction of college students' entrepreneurial base.

The acquisition of the total organic carbon (TOC) content mainly relies on the geochemical analysis and logging data. Due to geochemical analysis is restricted by coring and experimental analysis, so it is difficult to get the continuous TOC data. Logging evaluation method for measuring TOC is very important for shale gas exploration. This paper presents a logging evaluation method that the shale is segmented according to sedimentary structures. Sedimentary structures were recognized by core, thin section and scanning electron microscope. Taking Wufeng-Longmaxi Formation, Silurian, Muai Syncline Belt, south of Sichuan Basin as research object, the shale is divided into three kinds: massive mudstone, unobvious laminated mudstone, and laminated mudstone. TOC within each mudstone are calculated using GR, resistivity and AC logging data, and an ideal result is achieved. This method is more efficient, faster and the vertical resolution is higher than △logR method.

The current card attendance check system in colleges has the problems of low efficiency and accuracy, and severe condition of taking attendance for others. To solve these problems, we have designed attendance check system for college students based on fingerprint identification technology. This system can share information with educational administration system, offering such functions as academic year and semester management, classroom management, lesson management, and schedule management, and attendance check authority management, etc. This system utilizes the characteristics of fingerprints, which carries uniqueness and stability and adopts the increasingly mature fingerprint identification technology. It can improve the quality and efficiency of attendance management for college students, and promote the information construction on campus.

The microhardness and microstructure of Ti-24Al-15Nb-1.5Mo/TC11 dual alloy joining interface processed by different heat treatment regimes were investigated. The results show that the microhardness of the weld zone and Ti-24Al-15Nb-1.5Mo alloy side of the dual alloy processed by gradient heat treatment are higher than that of the specimen processed by balance heat treatment. Moreover, the microstructure differences between the specimens processed by gradient heat treatment and balance heat treatment are very obvious, particularly in the interface between the TC11 alloy and the weld zone. While the joining interface is processed by gradient heat treatment, the microstructure change homogeneously, and the demarcation lines are ambiguous. However, for the joining interface processed by balance heat treatment, the demarcation lines are very obvious, and the microstructure of the TC11 alloy side is bi-morphic, the lath is short and coarse. Therefore, the interface integrity of the dual alloy processed by gradient heat treatment is better, which is an adoptable method to improve the properties of the dissimilar alloy joining interface.

Ti-Fe alloy is prepared by the electrolytic reduction of titanium concentrate in molten CaCl2 under argon atmosphere. The formation mechanism of Ti-Fe alloy is discussed. The impact of electrolytic time on product is studied when electrolytic voltage is 3.1V and electrolytic temperature is 900°C. Results show that Ti-Fe alloy with uniform composition can be obtained by this method. The deoxidize product is iron and TiFe alloy by order. The reduction of Ti is a multi-step process and the intermediate products include CaTiO3,TiO2, Ti2O3, TiO,Fe, TiFe2.

The unique design for a novel 3-DOF hybrid mechanism is investigated in this paper. According to the feature of the hybrid mechanism, its kinematics is resolved in detail. And the shape of the workspace is described, which can provide theoretical base for the optimal design and application of the mechanism. This novel 3-DOF hybrid mechanism is suitable for the industrial, agriculture and service applications in which the requirements for simple structure, high stiffness, and large workspace.

LLC resonant converter can adjust the output for a wide range of source and load with a small fluctuation of switching frequency, so it is used widely. This paper introduces all arrangements of LLC topological group, then proposes a new topology which is consist of Type-4 and Type-11 that used widely,in this paper we also give its calculate method of resonant frequency. Lastly we get gain characteristics of the topologies in the PSpice simulation environment and analyse the influence factors on adjustment ability in certain load range .

Electro-hydraulic power steering system (EHPS) assistance characteristic curves are generally linear, folded line and curve type. The folded line type combines the advantages of linear and curve type assistance characteristic, but the slope of the characteristic curve changes suddenly, which have an impact on the driver, leading to potentially dangerous. In view of existing problem, the article studies deeply the characteristics of the power system to apply computer simulation technology, and improves the folded line characteristic curve. The simulation analytic results show clearly that the improvements of folded line assistance characteristics curve is reasonable.

In order to study the electrochemical performance of coal in the HCL electrolyte system, researchers prepared the chemically modified carbon paste electrode, measured the volt-ampere curves and Tafel curves of the samples and analyzed the mechanism of the electrochemically catalysis of oxidation of coal. The studies indicate that what occurs to the coal sample in the process of electrolytic sulfur removing is a quasi-reversible diffusion controlled process. In the beginning of the sulfur removing, the rate of electrolytic corrosion is fast, in which oxidation on the anode denominates, and the cathode plays a role of reduction in the late period.

Electrochemical desulfurization is a mild chemical desulfurization method. This paper introduces the electrochemical catalytic oxidation method which is used to process High Sulfur Coal samples under acidic condition. Study tells that during the processing of electrochemical catalytic oxidation desulfurization ,pyrite and organic sulfur in coal are oxidized and converted into water soluble sulfur compounds by some active oxygen and other oxidizing agent or high valence ions which are produced on the surface of electrolytic anode.After analyzing the experiments ,another conclusion that the desulfurization process is faster for the added catalyst ion also involving in the reaction is reached.

Ti-Fe alloy was prepared by electroanalysis using titanium concentrate as the cathode at 3.1V in CaCl2 molten salt. The temperature is respectively 850°C and 900°C. The comparison of the results under different temperature shows that the temperature has a significant influence on the diffusion process and the electrolytic products. At 850 °C, the final electrolytic product is the TiFe2 and Ti discrete ball-type structure with the particle size of 1 μm, while at 900 °C the final product is the TiFe space net structure with the particle size of 3 μm.

China is meeting many environmental challenges that threaten food safety and security but there are actions China may implement to improve this situation. Current impediments include continued population increase, rapid urbanization, and decrease in arable lands, water pollution and climate change. China should control the population, improve irrigation techniques, fight against water pollution and invest on education to facilitate a major transition in the development mode and strive for more sustainable consumption of natural resources. These actions will ensure China’s self-sufficiency and prosperity.

For management the manhole cover effectively, the manhole covers intelligent monitoring terminal (MCIMT) based on dual frequency RFID and acceleration sensor was proposed in this paper. Through hardware designing, alarm algorithm designing, program debugging and packaging, we developed the MCIMT. The key performance testing and demonstration system operation shown the following results. Firstly, the MCIMT communication distance can achieve 800 meters under the open conditions and 300 meters under the occluded environment reliably. Secondly, the MCIMT embedded special state estimate algorithm can output the correct scene sate of manhole cover. Thirdly, the MCIMT could operation 3 years in manhole cover. Lastly, the demonstration system based on the MCIMT can alarm accurately and timely.

In order to reduce the danger of single coal seams outburst during the tunneling in coal roadway and ensure the tunneling of coal seams, this text analyzed the mechanism of crossing drilling against outburst; studied the area measures of floor tunnel crossing and grid drainage boreholes in coal roadway, Designed and optimized the drilling technical parameters; Analyzed the relationship between the drainage concentration and scalar; Calculated the maximum overlying coal seam gas to spare scalar quantity is 224300 m3 ;Used a variety of indicators to investigate the effect of outburst prevention. It shows that Gas content and gas pressure have significant lower than drainage. After the drainage up to standard, all the sensitive indexes is not overrun, during the coal roadway tunneling, it does not appears dynamic phenomenon. Solve the problem of mining imbalances, guaranteed the safety driving of roadway.