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Liquid ring vacuum pump which uses rotating liquid as piston to abstract and compress gas is a kind of rotating positive displacement pump. Its running state implies some fault informantion. To capture performance levels of liquid ring vacuum pump, a comprehensive performance monitoring system includes data acquisition, data reprocessing, data storage, abnormal judgment and fault alarm, performance displaying is developed in this paper. Hence, the performance levels of liquid ring vacuum pump can be observed anytime by the monitoring system, the maintenance cost can be reduced, pumps can be operated at the highest performance level as far as possible, the reliability and the maintainability of liquid ring vacuum pump can be effectively improved by this monitoring system.

The timber-concrete composite (TCC) beam is a new type of structural member, which formed by combing a timber beam and an upper concrete flange using different types of connectors. Compared with the traditional timber beam, the bending and stiffness of the composite beam is proved. In composite structure, the important factor of the structure is the shear connector. So structural efficiency of a TCC highly depends on the stiffness of the interlayer connection. This paper presents a survey on the state-of-the-art of shear connectors for TCC beam research in the past and recent years. And put forward to the subsequent study of shear connectors in TCC beams.

The property of temperature-frequency drift has an effect on the passband ripples, center frequency and insertion loss of FBAR filters, reducing the reliability of its electrical application. A temperature-frequency drift simulation of a typical Mo/AlN/Mo FBAR is achieved by means of finite element analysis software ANSYS, the simulated temperature coefficient of frequency is about-35ppm/°C within the temperature range of-50°C~150°C. By adding a compensated layer with positive temperature coefficient in the FBAR structure, the effects of the compensated layer thickness on temperature-frequency drift, resonant frequency and electromechanical coupling are analyzed. The simulated temperature coefficient of frequency of designed temperature compensated FBAR, which composed of Mo/AlN/SiO2/Mo, is about 0.8ppm/°C, the property of temperature-frequency drift is effectively improved.

Sacrificial layer release is the key process step of cavity structure formation of Film Bulk Acoustic Resonator (FBAR), the degree of sacrificial layer release directly determines how good or bad the resonance characteristic of FBAR is. The Constant Diffusion Coefficient (CDC) model numerical iteration of sacrificial layers etching process was simulated with MATLAB, and the etching process was also simulated with Silvaco. According to the simulation results, put forward optimum design of release window. The resonance simulations of FBAR with/without release window have been done by FEA software. The simulation results show that the aperture cavity type FBAR, i.e. the cavity type FBAR with release holes, still has distinct resonant characteristic, but the frequency of impedance zero point and impedance pole of the novel type FBAR are all drifted to higher frequency, and the effective electromechanical coupling coefficient and the quality factor are all reduced.

With the increasing of resonant frequency and integration of film bulk acoustic resonator (FBAR), the electromagnetic interference (EMI) of FBAR devices appears to be extremely important. The electric fields of the common electrical model and finite element model are assumed to be quasi-static and cannot simulate the electromagnetic (EM) property. A 3-D EM model of FBAR is achieved by means of high frequency EM simulation software HFSS. A real-time simulation of EM distributed effects, EM coupling and piezoelectric effects is achieved by employing an effective permittivity in the EM model. The effects of the high frequency EM distributed effects and the EM coupling on resonant characteristics are analyzed. By optimizing the distance between FBAR and components, introducing substrate materials with different permittivity, the EM coupling is effectively reduced.

Vibroplatform test is an important means of testing the dynamic characteristics of the laboratory sim-ulating structure under seismic action. For structure whose volume and weight exceed the limits of vibroplatfor-m tests is usually carried out through model test according to the similarity theory. So how to deal with the simil-ar relationships among the test model and how to verify thethe rationality of vibration control strategy through testing results become the key and fundamentalproblems. 1:15 scaled models will be made through the dimensional analysis based on a 4 layersL-shaped frame structure as the proto-type , which are made from micro-concrete, aluminum alloyand plexiglass. SFMT sap2000 is used to make a dynamic analysis to get the values of period,acceleration, velocity, etc. Comparing the results of prototype inferred from model through similarrelationship with theoretica-l values of prototype to get the correct formula and confirm the bestscaled model and then provide references f-or model test later.

PC box-girder bridge with corrugated webs is a new kind of bridge, which named by the thin steel webs replacing thick concrete webs. It is applied abroad in China recently, which attracts attention for its shearing property. Because of lacking relative design and construction code interiorly, the related data of Mi-Luo-Jiang bridge was used in the study with the software ANSYS 10.0. The shearing property and bucking stability of Mi-Luo-Jiang bridge were studied and a theory was verified: corrugated webs do not bear moment and axial force. Besides, the result that the decisive parameter of shearing property of Mi-Luo-Jiang bridge should be allowable shear stress is obtained. The other study had been done on buckling stability of box-girder bridge with different corrugated shapes, maintaining other parameters invariant. Finally, the optimal scope of lateral plane length is [0.2,0.4], and the optimal scope of folded angle is [20º,50º]. The parameters used in Mi-Luo-Jiang bridge is verified as the best value. This study is meaningful and the results can be applied in the design and construction of the same type bridge.

Based on the first panel of some coal mine in the western loess tableland, this thesis has carried out three-dimensional exploration. The emphasis of experiment is shooting factor(well depth、dynamite), at the same time, the experiment of instrument factor and receiving factor has been carried out to choose the best shooting factor and receiving parameter. By proper layout observation system, elaborate static correction and comparison about various methods of static correction, this thesis has drawn the following conclusions: (1) From the experiment of well depth, interference wave is mainly composed of multiple refraction wave and surface wave, in general, the greater of the well depth, the smaller of the interference of refraction wave, and the interference of surface wave has dropped. Refraction wave energy is related to excitation horizons; (2)From receiving profile during the process of the experiment, the wave detector of dominant frequency being 25Hz has little difference with the wave detector of dominant frequency being 60Hz, so each has its advantages. The levels of reflection wave groups in coal seam of 60Hz profile are relatively abundant, and the continuity of the bottom reflection wave in coal seam of 60Hz profile is greater than 25Hz profile, and it is easier to trace, compare and explain. (3) From the process of the experiment, the complexity of surface conditions has little influence on data, on condition that being constructed strictly and completing static correction, it is absolutely possible to finish geological exploration.

Yb:YAG laser ceramic nanopowders were synthesized by the carbonate altogether precipitation method, and the thermal properties with structure and morphology characterized and analyzed by the measurements of TG-DTA, XRD, IRS, SEM. The results show that well-crystallized Yb:YAG nanopowders calcined at 900°C are obtained with higher sintering performance and purity, and the average diameter is in the range of 100 nm. The crystalline size grew with the increase of the heat treatment temperature. The size of powder calcined at 1100°C is about 70-150 nm with higher purity, regular shape and even particle size distribution, which is favorable for good sinterability of Yb:YAG ceramics.Key words: Yb; YAG laser ceramic powders; nanopowders synthesis; carbonate altogether precipitation method

Street lamp has become the essential functional unit in society for its widely use , Street lamp power energy saving has become a very worth studying problem high demand. Aiming at such a demand, this paper proposed a kind of optimizational energy saving streetlight that based on the voltage and reactive power, this article put forward such a research mainly aims at the demand of Jinan street lamp management. The research improved the grid power factor, reduced the network pressure drop and reduces the energy consumption of street lamp. It upload the master station through GPRS network real-timely, And accept command such as mode conversion, parameter setting, time checking and capacitor switching. It implements the voltage optimization function, remote monitoring and control functions on the basis of ensuring road illumination and uniformity, Which realized street light energy-saving and reduced the loss of lines and transformers at the same time. And it protect lighting lamps effectively. Examples show that the study further improved the management level of Jinan street lamp, it realized the double harvest of electricity environment optimization and electrical energy saving, Which made a great contribution to energy-saving society construction.

The current feature for motor carried with natural mixed eccentric and bearing fault is merely focused even though it is very important for motor online diagnosis. Based on the amplitude modulation, this theme researched on periodic change of the air-gap length caused by not only bearing fault but also mixed eccentric. Based on the relationship between the motor inductance and the magnetic permeability, the inductance expression was deduced for motor with bearing fault, motor with mixed eccentric and motor with not only bearing fault but also mixed eccentric. A new current eigenfrequencies expression was introduced by employing proposed inductance expression. Finally, a series of simulation studies were conducted, the results show that the new current eigenfrequencies expression is valid and useful for online diagnosis of those motor in service.

Remote instrumentation and measurement has always been an attractive area to researchers. Studies on grid-enabled instrumentation system have turned many instruments into resources similar to the computing and storage element. However, the advent of cloud computing further inspires the idea of instrumentation service provision rather than resources. Upon this philosophy, this paper proposes an architecture for instrumentation cloud aiming at guiding the development of the unified platform for remote instrumentation resources management and service provision. The design of the architecture is based on the analysis of requirements for future remote instrumentation system. Then, the use case and related activities of the instrumentation cloud system are derived. The detailed architecture and related function modules are designed according to previous system modeling. Finally a discussion is presented to analyze the potential problems that may encounter in developing the instrumentation cloud. However, most of them are just technique issues and can be solved once technology improves. The proposed architecture is a good guide for future development of on-cloud instrumentation system.

Neodymium-doped gadolinium gallium garnet (Nd:GGG) precursor and ceramic were prepared by liquid phase co-precipitation or solid-state methods, and the properties were studied. The results indicate that the precursor prepared with the liquid phase co-precipitation method has a small particle size. The sub-transparent ceramic was obtained after the body sintered for 2-3h at 1650°C at 1100Pa using liquid-phase co-precipitation method. When the body was sintered at 1750°C for 2-3h, a sintered body with non-transparency was obtained. The absorption spectrum and fluorescence spectrum of the sub-transparent ceramic were measured with the cross section at 807nm was calculated as1×10-20cm2 and the strongest emission peak located at 1061nm.

Two methods of depth measurement by the expendable temperature, conductivity and depth profiler are introduced in this paper. For their shortages, the measurement of pressure sensor and the theoretical calculations of depth were fused by the Kalman filtering algorithm. The depth measurement from the pressure sensor is corrected in real time. It is validated by the experiments that the algorithm can significantly improve the accuracy of depth measurement. The phenomenon of clutter and knotted in profile data of temperature and salinity due to fluctuation of depth data can be corrected as well.

Fire risk of gas pipeline leakage is high.The factors contributing to gas pipeline leakage most are third party damage, corrosion, design and incorrect operation. The accident consequences of gas pipeline leakage and quantitative risk assessment method of gas pipeline leakage consequence are analyzed. In order to achieve quantitative fire risk assessment of gas pipeline leakage, flash fire model, vapor cloud explosion model and thermal radiation damage criterion are analyzed. Firstly, the gas leakage quantity is estimated. Then, the heat radiation estimate flux, the thermal dose and damage range are got by using flash fire model, vapor cloud explosion model and the thermal radiation damage criterion respectively.Combined with an example of gas pipeline, damage ranges of different disaster patterns are estimated according to different gas pipeline leakage pattern. Through comparing the accident consequences of gas pipeline leakage, this paper provides some reliable scientific references for gas pipeline management departments.

This study proposes a pre-stressed dual-layer six-axis force sensor with eight limbs, and discusses the structure analysis of the sensor. The number of measuring limbs is determined and the structure characteristics are introduced. Force distribution analysis of the sensor is presented based on the mathematical model and force mapping matrix. The forces on the measuring limbs are decomposed into particular solution and homogeneous solution. The results of the paper are useful for the development and further research of the pre-stressed six-axis force sensor.

When robot do contact operation task to unknown environment, it often need wrist force sensor to check contact force information between robot and environment then judge the contact state, and check the information feedback to control system for completing operation smoothly. This paper analyze the measure theory of robot end wrist six-axis force sensor based on screw theory, propose and verify the limitation of six-axis wrist force sensor for measuring the six-dimensional force online.

The paper research the radio signal monitoring and analysis of digitized for Army Digital Force Training. aimed at scientific planning and the use of spectrum resources, developed a set of visual assistance decision support tool based on component-based and soft bus design method, it will provide support for digital forces training and research accused the rules and characteristics the use of communications equipment in a complex electromagnetic, in addition, it provide technical means for radio direction-finding and localization. Keywords: Digital Force; radio monitoring; software bus

The soft spread spectrum realizes its function through the Cyclic Code Shift Keying (CCSK) which is not distinguished from the direct spread spectrum system (DSSS) in more literature. In this paper, the performance of the soft spread spectrum with the single-tone jamming is analyzed and simulated compared with DS. The conclusion is drawn that the capability of the anti-noise is obvious but declined seriously to the man-made interference.

Environmental pollution and energy crisis have become two major problems in todays society, how to pay the least cost while enjoy has become the humans thought. In this context, an environmentally friendly and healthy concept of the green building for the design came into being. Today, all of humanity is in the face of the common crisis, including climate change, air pollution and scarcity of resources. The sustainable development has become the mainstream of contemporary society. And due to the construction activities, there has made a large number of environmental pollutants while consuming a large amount of resources, so that the sustainable building development issues need more attention. The research and practice of the green building is put forward to achieve such a goal.

As the global economy continues to grow, the resource consumption and environmental effects of the building and its running are growing. It is our common task to reduce building energy consumption and pollution emissions, to conserve resources, to protect the environment and achieve the harmonious coexistence of architecture and nature. And China, as a developing country, is facing with the heavy tasks to develop economy and improve peoples livelihood, at the same time, also facing with the challenges of resource and environmental constraints. Building energy conservation will be a long and arduous historical task, also an important and urgent realistic work. Currently, China is undergoing the worlds largest urban construction, while the building energy efficiency is the key area of energy conservation. Promoting the development of intelligent and green building is an important measure to implement the concept of the scientific development and to build a resource-saving and friendly society. Strengthening the international green building cooperation and exchanges will promote building energy efficiency to play a positive role.

In consideration of the geology and hydrogeology of the strata in Chengdu city, and in view of the general depth of subway station, its main structure and retaining enclosure for foundation pit constructed with open cut method is generalized in this paper. In order to expound the design of subway station structure with open cut method, a typical design of subway station in Chengdu subway line 7 is illustrated in the paper. The design of open cut subway station structure and its enclosure in Chengdu is still summarized and can be used to guide the structural design of subway stations under similar conditions with open cut method (OCM).

By tracking a beacon ball with theodolite and radar synchronously to inspect the accuracy of ra-dar data is one of the common calibrating methods without calibration towers at sea. Relied on some com-plications, the theodolite which acts as the standard in the precision test can not following the track of a d-ynamic target continuously for a long time. So the present processing methods based on isochronal interv-als can just make use of less continuous data. Upon that a new dynamic adaptive checkout method is introduced. It solves the problem of outliers-eliminating automatically among a great deal of data at unequal in-terval time by three culling steps. The results indicate that this method can eliminate outliers in beacon ball tracking data and make batch processing base on uncontinuous data implemented effectively. Not only the data quantity has been increased, but also the data process efficiency has been improved.

In this paper, we present different code rates of LDPC decoding on Chinese Mobile Multimedia Broadcasting standard (CMMB). There are two different code rates (0.5 and 0.75) of LDPC in CMMB standard.In this paper, we use LLR-SPA algorithm to decode and make a simulation. Simulation results show that the higher code rate (0.75) of LDPC code in CMMB standard provides a better performance.

Beginning with an introduction of algorithm principle for Baseband Equipment to implement carrier acquisition in digital field, costas loop of acquisition and tracking, PSD estimation of FFT frequency guide are developed. Then the quality of classical PSD estimation and Modern PSD estimation has been analyzed and compared especially by Matlab simulation.

Siding Lead-Zinc mining area located in Guangxi,was a large mining area belonging to the nation.Because of unreasonable mining in many years,The good ecological environment of mining area was destroyed.Land collapse in mining area is series.Basing on the factors,such as the geological environment of karst development,the characteristics of karst development,the formation stage of the cave,the conceptive model,this paper analyzed the cause of karst collapse in mining area.

This paper, setting the karst collapse in Siding lead-zinc mining area as an example, introduces the existing geological problem in this area, and then analyzes the cause of this karst collapse briefly. It states the main countermeasure of this karst collapse engineering from different angles and puts forward the idea that the method of clear block need to be adopted to solve the problem in the mining area, and achieves good results. We hope to provide some reference experience for other similar geological problems.

Taking the Sifang Bridge in Yunnan Province in China as an example, this paper analysis the influences of soil-structure interaction on seismic response of extradosed cable-stayed bridge with response spectrum method. The results show that extradosed cable-stayed bridge has a shorter nature period than cable-stayed bridge, and torsional vibration mode does not happen in the first few modes as the beam has a bigger stiffness. The displacement of the structure will be underestimated if the soil-structure interaction is ignored while the design of some parts is conservative.

Designed a generation system by using ocean wave power for seabed-base detector. The system is mainly composed of an energy conversion device, hydraulic system, power generation system and automatic control system. This paper showed the composition of each subsystem, including the structure of axial flow turbine and the conversion equation of PID control system, hydraulic motor system. The simulation model is established by using SIMULINK block of MATLAB software, gave the results in two different conditions, one have the stability external input and the other don’t meanwhile the hydraulic system will turn to accumulator circuit. The simulation results show that this system can provide stable power output as the real system design reference.

Setting in the youshui Bridge Project and referring to the stipulation on the temperature gradient in current code, this aims to investigate the effects on the stress condition of concrete box-girder bridges caused by the overall heating, cooling or standard temperature changes. The process was carried out by virtue of the general finite element analysis software—MIDAS/CIVIL. The result showed that temperature would greatly affect the structural behavior of a bridge, in particular that the stress condition of the top plate is sensitive to temperature changes. It was therefore suggested that climate conditions should be taken into consideration when determining the temperature gradient values in the code.

The means of active recommendation is now increasingly applied to many different domains as it might meet users’ growing demands of personalized information service in process of selective purchasing for products, and research of recommendation technology based on user’s characteristics has been a key role in study area of active recommendation. However, investigations were performed to view there are still some deficiencies on existing methods. Therefore, an active recommendation method based on users’ static and dynamic characteristics is present and this paper proceeds as following. Firstly, feature model of user interests is constructed by analyzing static and dynamic data of target users for specific recommend. After that, neighbor users who have similar attributes with object user are found by reference to user model. Last, preference of intended user for other resources is reasonably predetermined by calculating interestingness with combination of neighbors, finally in this way can the main theory basis of recommendation comes into being. So in this paper a new approach based on users’ characteristics is provided, and it is shown with this method can effectively solve problem of shortage of satisfaction of traditional recommendation.

Distributed Generation that is usually installed in the client or near them is a kind of power equipment whose capacity is generally small in the tens of kilowatts to tens of megawatts, which becomes a hot research area at home and abroad in recent years. The method for power flow calculations on distribution networks face new challenges because of the access of distribution generation, while, modeling of distribution generation is the basis and precondition for the research of power flow calculations on distribution networks with distributed generations. The article studies the modeling of distributed generations in power flow calculations, anylies most distributed generation forms, focuses on the interpretation of the principle and essence of them, and establishes theoretical models apply to the flow calculations. The modeling lay a solid theoretical foundation for the power calculations on distribution networks with distributed generations.

A variety of information about location combined by information of location based service, such as location information, requesting location-specific and data of customized service. The mashup of personal and public data，location data and service data creates innovative service. The integration allows rich，personalized and contextualized user experiences. Most of Location Based Service is restricted to the mashup of service. These current designs makes it hard for users to mashup LBS from a variety of service providers. Many services such as value-added service, integration of LBS providers are difficult for designer. The paper give a framework about mashup included the Gird Feeds architecture, which abided by standard Web service. Using this method, LBS can be exposed in an open, web-friendly and aggregation-friendly way.

We have researched the residual stress in super-smooth glass ceramics using nano-indentation technology, according to the characteristic that the residual stress in the process of pressure is sensitive to the pileup around the indenter, we can determine the changing area, then combine this with the elasto-plastic contact theory, thus the residual stress calculation formula is obtained. By the continuous strain obtained by a spherical indenter and the research on the yield stress and stress-strain curves of microcrystalline glass through spherical indentation experiments, we can get the rule which can tell us how the residual stress of the microcrystalline glass changes with the depth from surface. This research helps to improve the processing quality as well as the performance of the super-smooth surfaced microcrystalline glass, obviously it has a wide application prospect.

Energy dissipation structure is favored by designers because the earthquake energy can be dissipated by the dampers, which can avoid or reduce the damage caused by earthquake. However, the energy dissipation structure design is complex and the most domestic designers can not master it easily. In this paper, a simple and practicable design method for viscous damper dissipation structure by using the PKPM design software is proposed based on a 7-storey frame structure in highly seismic region. Firstly, lower half or one degree for the design intensity to design out an uncontrolled structure. Secondly, determine the supplemental damping ratio required for the fortification intensity via modal analysis method of PKPM software, and identify the numbers of the required dampers as well as their corresponding installation positions in line with the methods in the seismic code of China. Finally, the ETABS program is adopted to conduct the time-history analysis of the designed dissipation structure, showing that the proposed method in this paper can produce a satisfied result.

Based on the horizontal and vertical components of a set of 30 acceleration records obtained from 10 near-fault earthquakes, the horizontal and the vertical response spectra are established, and have been compared with each other in this study. Statistical analyses show that, for the selected 30 acceleration records, the maximum mean of vertical acceleration spectra is slightly higher than which of horizontal acceleration spectra. That means the near-fault earthquake really have significant vertical effect. Consulting the domestic and international research achievement, the normalized near-fault design spectrum adapted to Chinese seismic design Code (GB50011-2010) is established in horizontal direction. The results show that, within short period range, the horizontal near-fault design spectrum obtained in this paper is obviously higher than which derived from Chinese seismic code. Subsequently, the spectra of horizontal components for the selected 30 records are each scaled to match the horizontal near-fault design spectrum at two periodic points of 1.0 and 1.5 sec respectively, and the corresponding vertical spectra are scaled with the horizontal spectra at the same time. The scaled results reveal that the vertical spectra have much higher discretion than horizontal spectra, hence the study in this paper could initiates the research interest to a new aspect concerned with the randomness of vertical spectra for near-fault ground motions, which would affect the seismic reliability of structures significantly.

As wide application of EEPROM devices in space and military field, more and more researches focus on its radiation hardened characteristics in international. To improve the single-event effect (SEE) tolerant ability of read-out circuits in the memory, a radiation hardened circuit is designed. The design kernels of radiation hardened latch-flip are given and designed to resist the single-event upset (SEU) effect. A correction circuit is proposed to resist the single-event transient (SET) effect. The performances of this design are: SEU (LET)th ≥ 27 MeV•cm2/mg, SEL(LET)th ≥ 75 MeV•cm2/mg , read out time ≤200 ns. The new design not only satisfied the needs of present work, but supplies a worthful reference for radiation hardened circuit design in future.

The paper presents a reverse analysis and crack-found methodology with the functional model as the centre for OS trusted mechanism, pays attention to the functional model establishing of binary code and the description methodology. And it designs general XML-based storage structure to serve the storage and transformation of information cross levels in the level functional model of trusted mechanism, develops the plugin of IDA, which takes and stores routine Control Flow Graph and level functional model automatically from the binary code.

As a result of the path route and the width change and in order to connect south of K4 + 726.852 bridge with road in HengZhou avenue smoothly, we need to reverse the cross slope which takes up 2 percent of the bridge deck. We analyze three different reform plans, so as to ensure security of HengZhou bridge. Firstly, we compare the influences for the bridge structure bearing capacity from different projects. Secondly, we study the transformed force performance. Thirdly, we evaluate the bearing capacity. Result shows that transformation surfacing method is costless and easy to operate. The bearing capacity meet the requirements after the transformation. The research achievement has some reference value to other similar bridge for strengthening

This paper generalizes the research status of passive energy dissipation technology in the field of Structural Engineering. Many achievements has been gotten since its emergence, including the manufacture of dampers, the experimental research and control effect analysis for energy dissipation systems, as well as the studies on its optimal design theory, which plays an important role in protecting people's life safety. However, the current design idea mainly focuses on the security, thus the energy dissipation structures will still suffer great economic losses even in moderate earthquakes. As a result, it is quite necessary to introduce the performance-based seismic design idea to study the design theory for passive energy dissipation. This paper has detailed three key problems in performance-based design of passive energy dissipation and put forward some strategy. Finally, it marks out that to study the performance-based design theory in passive energy dissipation system is of great significance in promoting the sustainable development of society.

Pile grouting technology is widely used in engineering to effectively improve the vertical bearing capacity, in this paper; we made a comparative study on the bearing capacity of grouting pile and General pile in Wuqing district Tianjin City. And proving this method can improve the pile bearing capacity, with good effect, and significant economic benefits.

The yanmiao bridges are used in the 32m prestressed concrete simply-supported box girders on the wuhan-guangzhou passengers dedicated line,they are constucted in the mobile form.To ensure the constuction safety and the accurated line,static load test and monitor for the mobile form were did.The result of test and monitor showed that in the state of work the different parts’force of the mobile form is in the elastic range. The entire beam deflection curve linear is reasonable, they provided the test reference for the the setting of the pre-camber and the control of the box girder’s height.

Harp shaped cable-stayed bridges without backstays are popular due to their beautiful and unique styles; they employ leaning tower columns to balance the constant and movable loads on the decks and are not provided with backstays, so they are beyond the traditional bridge design philosophy. In this paper, we discussed the reasonable structure of the main girder of Changsha Hongshan Bridge – a harp shaped cable-stayed bridge without backstays through changing the design parameters of the main girder in respect of design so as to provide important reference for design of this kind of bridges, and the research mainly related to such aspects as the structure selection for and section design of the main girder, the influence of overweight of main girder on the force on the structure, the length of non-cable area of the main girder, the span of auxiliary hole, etc.

The increase in axle load and speed, the worse of service environment and the deterioration of existing bridges result in various of damages in structures. In order to ensure the safety of the structure, it is essential to assess the performance of the structure. In this paper, based on the frequency changes of the damaged and undamaged structure, damage positioning indicator method was used to locate the damage of the structure. Damage assessment method (SSZD) based on modified modal strain energy method was used to assess the extent of structural damage. The results show that this method can be used to locate and assess the structural damage accurately.

Based on the background of Xi-Jiang cross-river shield tunneling construction of gas pipeline network project in Guangdong province, this paper expounded engineering measures and innovative technology of the shaft maintenance structures under the composite stratum conditions, which included trench construction for diaphragm wall, reinforcement cage craning and installation, concrete spouting and static blast excavation, to provide some reference for similar projects.

Starting a business is the impetus of the increase and in economy ,and it is also the basic which makes the economy of a nation, a region, or a corporation full of continuable developmental energy. In entrepreneurial society, whether person, social or government maybe the entrepreneurs. Personal entrepreneurship is to create wealth; Social entrepreneurs are to support individuals to create wealth, and to support the formation of entrepreneurial ability and practice; Governmental entrepreneurship is to organize and guide the community to build the Entrepreneurial support systems. In the entrepreneurship, the Government's responsibility is not only to develop the policies of entrepreneurship promotion, but also to build the entrepreneurial support systems. The Government is the first entrepreneurs, that is , the creator of the Entrepreneurial support system.

To solving Chinese text categorization, a fast algorithm is proposed. The basic idea of the algorithm is: first constructs a weighted value of keywords dictionary which is constructed in key tree, then using the Hash function and the principle of giving priority for long term matching to mapping the strings in documentations to the dictionary. After that, calculate the sum of weights of the keywords which has been matched successfully. Finally take the maximum for the result of the classification. The algorithm can avoid the difficulty of Chinese word segmentation and its influence on accuracy of result. Theoretical analysis and experimental results indicate that the accuracy and the time efficiency of the algorithm is higher, whose comprehensive performance reaches to the level of current major technology.

Nd:YAG nanopowder was prepared by urea co-precipitation method. XRD, TG-DTA, SEM and spectra analysis were utilized to study the properties of the powder. Results indicated that fine Nd:YAG nanopowder can be acquired at 1000°C for 10h. The fluorescence spectra shown that the strongest peak was located at 1061nm, corresponding to the 4F3/24I11/2 energy level transition of Nd3+ ion.

Focusing on the existing problems of precision seeder the plate type plug seeder based on magnetic attraction was designed. The seeder can complete the process of attracting seeds and planting using magnetic attracting principle. Through prototype test of tobacco seeds the following conclusions can be obtained: in the attracting position the single seed rate comes up to 90% and in the seeding position the planting rate is 100%.This design combines seed pelletization technology and mechanization sowing technique. It can work entirely by manual operation. It has higher planting precision and good adaptability of the seeds. So it is suitable for large-scale factory breeding.

Mulit-agent system[MAS] research on learning has been in the area of negotiation, and learning strategies of other agents.This paper presents an agent learning approach in multi-agent system based on Bayesian learning, it researches to develop agents that learn free-text queries and keyword searches in MAS. The MAS learns to identify an appropriate agent to answer free-text and natural language queries as well as keyword searches submitted by users. The paper describes how Bayesian learning is implemented in MAS, and analyzes the effectiveness of MAS learning based on the Bayesian learning approach by analyzing the accuracy and degree of learning.