Abstract:

Abstract: Wavelet transform can conduct a detailed time—frequency analysis to non—steady—state signal and has been widely used in mechanical，aeronautical，civil engineering and so on．It is eonspicuous that wavelet analysis is applied in structural health monitoring and damage identification．The second generation wavelet transform had been raised on the basis of the first generation wavelet transform．It has much more advantages．Its algorithm is simple and the calculation is fast．It is able to suit fairly the partial feature of the signal and SO on．This paper reviewed and summed up the second generation wavelet transform theory and its application in structural damage identification．And its future development has been pointed out．

Abstract: The fundamental principles of capacity spectrum method are explained，the implementing procedures of this method are introdueed．and the seismic performance of afive—story steel frame iS evaluated on thebasis of capacity spectrum method．The analysis results indicate that this method can comparatively objectivelyreflect the seismic performance of structure，and it is of immediate convenience．Finally，the dynamic timehistory analysis iS utilized to verify the feasibility of this method，which can form a certain basis for the seismicdesign of steel frames based on the capacity spectrum method．

Abstract: In this paper，failure of storey deformation is regarded as main failure mode based on storey drift．The system reliability of RC multi—storey frame structure is calculated by using method of PNET．The resultis compared with that of Monte-Carlo method．The study result indicates that it is feasible to calculate the system reliability of RC multi-storey flame structure considering the dependence of failure modes based on failureof storey deformation as main failure modes．

Abstract: Reinforced concrete deep beam，as a retrofit frame concrete reinforced system，is introduced．Bycomparative test between the frame which is filled with reinforced the deep beam and the pure frame，the deepbeam can improve effectively primary stiffness，yield load and ultimate capacity of structure．Therefore．it canbe used as the first seismic defense．The calculation model is proposed for interactive analysis．

Abstract: In the paper，the lateral stiffness analysis on frame—shear wall structures is made on the basis of dispersed inner force distribution of links between frame shear wall structures and the flexibility of frame··shearwails structures．And a new calculating method distributing transverse horizontal loads between frames andshear walls respectively in frame-shear wall structures are suggested．The physical concept of those formulas isclear，and the results of calculation comparatively match the real working situation of frame—shear wall 8truc—tures under horizontal loads.

Abstract: The dish—shaped settlement curves are often induced in piled raft foundations．For reducing thedifferential settlement occurring in this kind of foundations，a simple numerical simulation model is presentedin this paper．In this model，piles are treated as springs and the stiffness of the piles is decided according tothe Q—s curves of capacity test．To decrease the differential settlement，three analysis methods are employed，which are horizontal variable-stiffness design method，vertical variable．stiffness design method and dimensionalvariable—stiffness design method．Comparisons about settlement are made between the equivalent-stiffness de—sign method and other variable—stiffness design method．The results indicate that the dimensional variable—stiffness design method is effective to reduce the differential settlement and to economize the building materialsconsumed．

Abstract: The fractal model of aggregates in Supepave mixture was deduced based on the theory of fractal ge—ometry．By taking SUPERPAVE-19 as an example，the relationship between the fractal dimension(D)and de—sign parameter was stadied by testing volume parameter of mixtures．Base on this，the design parameters ofmixtures were predicted．The results show that aggregate gradation of SUPERPAVE mixture has fractal charac·teristie too，The fractal dimension has good linear correlation with voids in mineral aggregate，voids filled withasphalt，initial compaction degree and asphalt content．The design parameters of SUPERPAVE mixtures withdifferent D can be estimated accordingly．The fraetal characteristics of SUPERPAVE mixtures will make designmethod of asphalt mixtures more objective．

Abstract: SAMPAVE(Stress Absorbing Mixtures Pavement)asphalt mixture is a new stress absorbing mixturefor delaying or restraining reflective cracking．It has the characteristics of anti-cracking，anti—leakage and be—ing adhesive．Based on the varying i method，the paper designs mineral aggregate composition of SAMPAVEasphalt mixture and compares it with China AC-5，the United States standard，KOCH corporation recommendgrading ranges recommended by KOCH eorp oration．The result shows that under the varying i method grading，the optimum asphalt content at upper and lower limit is in the range of±0．3％project grading．whichcan meet the production control demand of stress absorbing layer mixture．And SAMPAVE mixture has excel—lent hiIgh or low temperature resistance，anti-deformation。anti-fatigue and anti-water damage road performance．

Abstract: In order to study the reasonable diaphragm height and thickness of concrete T girder bridge，56group ANSYS finite element models of concrete simply supported girders were built，stress performance ofmodels have been analyzed under the centre load and side load．The analysis result indicates that some aspectsof girders and diaphragms stress performance achieved suitable values when the diaphragm height within limitsof 54％一8 l％of the girder rib height and the thickness of diaphragm is less than 20 cm．these aspects include：the mid span deflection of girders，the maximum longitudinal tensile stress of reinforcements in the midspan，and the transverse tensile stress of reinforcements at the bottom of intermediate diaphragm central position．Therefore．the reasonable values of diaphragm height should be taken during 54％一8 l％of girder ribheight，and the reasonable values of diaphragm thickness should be taken during 1 2 cm一20 cm，specific values should be taken according to the practice of engineering during these ranges．

Abstract: The Zhenfengou Bridge is asupported-continuous prestressed concrete small box-girder bridge，which is bearing replacements after damaging，is taken as the object to study in this thesis．The finite elementsoftware MIDAS／Civil is applied to set up the bridge’S FEM model and the bridge is calculated during thewhole construction stages．Two kinds of jack—up construction programs are considered，one is the whole jack·up construction program and the other is the partial jack-up construction program．The shear forces of the piertop，the bending moments of the midspan and the bending moments of the pier top both in the two programsare compared．The calculation results show，the 8mm maximum jack-up route is rational．From the opinion ofthe bridge’8 superstructure load bearing reasonability，the whole jack·up construction program is better thanthe partial jack—up construction program．The calculation results can be a reference for the similar project．

Abstract: In view of collapsible loess foundation in Zhengzhou—Xi’an passenger—dedicated lines，this paperanalyses the properties of long—-short—·pile composite foundation under the embankment load with finite ele··ment method to reach load transmission on pile in long—short—pile composite foundation，Mohr—Columnelasto—plastical constitutive model for soil and piles．The multi—stage filling by using life and death elementtechnology is stimulated．It shows that the influence of parameter of long pile on long—short—pile compositefoundation is more than the influence of short pile．The results are used to improve and to establish the long—short—pile computation theory for the subsidence of composite foundation with practical distinct meanings．

Abstract: Paulownia was liquefied by water in an autoclave in the reaction temperatures range of 280—360℃with iron powder as the catalyst．Effect of reaction temperature to biomass direct liquefaction process and thecomposition of heavy oil and water—·soluable oil were investigated through compared to the functional group in—frared spectrum differences between raw material and solid residue．The experimental results show that thecourse of liquefaction was significantly influenced by the reaction temperature．The solid residue，heavy oiland water—·soluble oil obtained at different reaction temperatures were analyzed by Fourier Transform InfraredSpectrophotometer(FTIR)．The analytical results show：(1)the cellulose and hemi—cellulose is entirelyconsumed at 320℃，and lignin are depolymerized at 280℃．but during the reaction temperature solid resi—due also contain aromatic ring structure．(2)The functional group of heavy oil is not change during the reac·tion temperatures．(3)The heavy oil and water—soluble oil is complex compound that contain hydrocarbons，aldehydes，ketones，earboxylic acids，phenols，esters and other compounds．

Abstract: A strain producing higher activity protease named Bacillus subtilis 115 is isolated and identifiedfrom waste—rich soil which stacked high temperature and long time．We optimize the fermentation conditionsof this strain and study a part of cnzymology properties．The results show that corn starch and soybean cakepowder are the optimization of this strain as carbon and nitrogen source for thermophilic alkaline protease pro—duetion．The protease belongs to thermophilic alkaline protease，which shows high pH stability and thermal stability．In addition，it shows excellent stability and compatibility with surfactant and detergent．These propertiesindicate that the protease has abright market prospect．

Abstract: Straw returning to farmland directly has negative effects on seed germination and crop growth．Adding high—efficient cellulose—decomposing bacteria is an effective method to resolve this problem．Fivestrains with different cellulase composition were isolated from rotten straw，COW dung compost，and paddy soil．One of the five strains which named X1 had the maximum cellulage activity and the optimal cellulase composi．tion．In this study the Cx，Cb，C1and FPA of X1 were 53．6 U／mL、69．7 U／mL、9．5 U／mL and 11．6 U／mL，and the straw degradation efficiency was up to 40．20％．The degradation efficiency of the combination ofstrains X1 and X2 Wag up to 45．50％，which higher than the others combination strains．According to themorphological characteristics of X1 and X2，it was deduced that they were Penicillium．

Abstract: Segmental baffle heat exchangers with different internal structures were investigated numerically．The results indicate that both the shell side pressure drop and heat transfer coemcient increase with the in．crease of the quantity of baffles，and decrease with the increase of height of the baffle cut，but the comprehen—sire characteristics decrease with the increase of the quantity of baffles and increase with the increase of heightof the baffle cut．The distance between the first baffle and tube plate has little influence on the pressure dropbut has great influence on the heat transfer coefficient．

Abstract: In order to keep storage battery active，a new intelligent battery discharging device that feedbacks energy is proposed in this paper．The device uses DSP to control the whole system．The major difficulty involved in this research is to control the discharge current．The device has been developed in the factory and test results in power system plants and substations are presented．The test results show the good agreement with the emulation and the developed system can satisfy the constant—current discharge of different capacity batteries．

Abstract: Euclid distance is commonly used to measure distance in the traditional k_means algorithm．The k—means algorithm based on weighted Euclid distance is researched and presented to overcome the existing problems of similarity calculation in clustering analysis based on traditional Euclid distance when we have no anydomain knowledge about the data objects，the relative distance but not absolute distance is more accurately re—sponse to data distribution．Experiments on the standard database UCI show that the proposed method can produce ahigh accuracy clustering result．

Abstract: Euclid distance is commonly used to measure distance in the traditional k_means algorithm．The k—means algorithm based on weighted Euclid distance is researched and presented to overcome the existing problems of similarity calculation in clustering analysis based on traditional Euclid distance when we have no anydomain knowledge about the data objects，the relative distance but not absolute distance is more accurately re—sponse to data distribution．Experiments on the standard database UCI show that the proposed method can produce ahigh accuracy clustering result．

Abstract: The problem of time delay estimation in wireless location is investigated．In the case of the receivedsignal with the narrow—band and background noises with the Gaussian distribution，a new algorithm of timedelay estimation is presented in terms of the Hilbert transform and the fourth—order cumulant．Correlationpeak is sharpened to improve the accuracy of estimation．Compared with generalized cross—correlated algo—rithm。the proposed approach can suppress the spatially correlated Gaussian noises．The algorithm is of lowcomputation complexity and easy to implement．Simulation results show the effectiveness of the algorithm．

Abstract: The Adaptive Vector Quantization(AVQ)neuronic network fuzzy clustering means are used toclassify and synthesize load characteristics in this paper．The composition proportion of substation load is usedas the characteristic vector．Two classification approaches are studied，including AVQ neuronic network fuzzyclustering means and Fuzzy C Means(FCM)．In case study，a case with 44 substations of Fujian province isstudied using these two means．Both of them could obtain the clustering center and aggregate load characteristics．They have a clear advantage over other clustering means．Compared with FCM，AVQ fuzzy clusteringmeans process large amounts of data more quickly．And its clustered results are more reasonable．

Abstract: This paper studies the content—based image retrieval for document image．Given aquery image，the system returns overall similar images by layout analysis and statistic feature in image database．First，seg·ment an image into paragraphs and lines based on mathematical morphology，return the image layout analysisresults；and then compute the image statistic feature include characters，statistic count feature and texture togive distil arithmetic of the document image．In the end，we describe the matching model．This algorithm istested through trials and errors．The experiment results indicate this algorithm is good at precision and recall．This algorithm is highly valuable in document image retrieval．

Abstract: A prepaid electric system which is mainly used in the three—phase system is introduced．Based onthe way that the prepaid controller terminals and the power meters are installed separately，reading data fromthe original meter for comparison，we install the prepaid control system with the least alteration of the originalwiring．The use of high security and stability RFID cards which has large data storage capacity ensures that wecan operate it in the case of non—opening electric meter boxes．Terminal control unit uses data redundancytechnology to store datum in order to effectively reduce the possibility of data loss and error．The power qualitymanagement program which is embedded in the background management system analyzes the relevant parame·ter and datum reading out of the power meters，SO as to improve power quality．The combination of backgroundmanagement system and terminal control unit ensure that users will not lose any information even if the card islost．So we will be able to fully secure the rights of users．This system allows of updating and creating new US—er accounts for the purpose of one card with more users or one meter with multi—cards．This paper puts for—ward the idea of box—-opening recorder for anti power—-stealing to reach the goal of box--opening managementand the prevention of power theft．