• Volume 27,Issue 4,2010 Table of Contents
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    • Seismic analysis of the mid-rise residential building of cold-formed thin-walled steel framing system

      2010, 27(4):1-4.

      Abstract (442) HTML (0) PDF 1.18 M (462) Comment (0) Favorites

      Abstract:The three- dimensional space whole model of cold- formed thin一walled steel residential build- ing with different floors was established by using the finite element analysis software SAP2000, the struck tural response of which was analyzed when the seismic fortification intensities were 7 aril 8. The results in- dicate that the cold一formed th in一walled steel residential building has a well integral behavior and the maximum of story drift angle meets the requirement of the current national criteria; the model of cold- formed thin- walled steel residential building was appropriate to reach the six一storey and the maximum height was 18m at the 8 seismic fortification intensities and below.

    • Deep foundation pit support design of the subway station based on ANSYS

      2010, 27(4):5-8.

      Abstract (428) HTML (0) PDF 1.09 M (466) Comment (0) Favorites

      Abstract:The foundation pit support scheme of diaphragm with inner support was made according to the characteristics of Yongtai station for Guargzhou metro line, where the deep foundation pit was long and with many underground karst caves and bad geological conditions. The effect of the major factors to the die- phragm deformation, including the thickness of diaphragm,the stiffness of the inner support and the pre- axial force, were analyzed by use of the ANSYS. The thickness of diaplmagm and the stiffness of inner sup- port are confirmed according to the relationship curves of the two versus the maximum displacement. And then, the pre-axial force of the steel support is adjusted to make the maximum displacement of diaphragm acceptable. The monitoring results show that the displacements of the diaphragm and the settlement are about 30mm, therefore the supporting scheme of the deep excavation is reasonable and can serve as a refer once for similar projects.

    • Seismic behavior of frame-supported short-leg shearwall structure with haunched and inclined transfer beam

      2010, 27(4):9-12.

      Abstract (253) HTML (0) PDF 759.71 K (404) Comment (0) Favorites

      Abstract:According to the experirrrerns on short-leg shearwall transfer beam specimens subject to vertical load and horizontal cyclic load have been carried out, mechanical behaviors of the joints are investigated. The stress states before and after cracking, the occurrence and development of cracks and the failure modes were obtained. 11 a test research the influence of haunched and inclined beam on the carrying capacity of transfer joint. The results sups show that the initial slope column specimen stiffness and ultimate stiffness are both greater than the haunched type specimen, their hysteresis curve are established and hysteresis energy has also increased.

    • Displacement prediction method of deep foundation pit based on self-memory theory

      2010, 27(4):13-17.

      Abstract (717) HTML (0) PDF 342.49 K (789) Comment (0) Favorites

      Abstract:Traditional gray G1Vl(1, 1) prediction model for non一negative incxemental time series have good prediction accuracy, but the prediction accuracy is not enough for large amplitude fluctuation time series. In order to improve prediction accuracy, the trend curve- self- memory combination prediction model is es- tablished based on the trerxl curve model and the self- memory theory, and the model is applied in the prediction of the amount of displacement of deep foundation pit,and with grayCM(1, 1) prediction model and trend curve prediction model comparison, the results show that the model has high prediction accura- cy.

    • Summary and analysis of increasing range of bearing capability of single bored pile after grouting

      2010, 27(4):18-22.

      Abstract (180) HTML (0) PDF 552.51 K (383) Comment (0) Favorites

      Abstract:There are bottom sediment and slurry skin at pile side in bored piles, so that the bearing capa- bility of piles can not fully develop. Post-grouting technique can eliminate the above inherent defect and enhance the bearing capability. The adaptability of post一grouting and the increasing range of the bearing capability are different in different bearing strata. The increasing range of the bearing capability is sum- marized according to the numerous examples of construction projects in Beijing, Shanghai, Tianjin and Wuhan. After comparing and analyzing these data and considering the safe reserve, the general increasing range of the bearing capability has been put forward in the above four regions. The advised general increas- ing range can provide reference to design and construct bored pile after grouting.

    • Research on compound performance of waste concrete pulverized admixture

      2010, 27(4):23-25.

      Abstract (197) HTML (0) PDF 435.09 K (413) Comment (0) Favorites

      Abstract:For increasing utilizable efficiency and reusing concrete completely of waste concrete, the feast bility of using waste concxete for cement addition is studied through XRD patterns. The paper teed sepa- rately 10%,20% and 30% writes concrete to replace cament and test's the effect of two kinds of excita- nts. The experimental results shay that 42. 5 ordinary Portland canent can be producedwhen the admixing amount of waste concrete is less than 10% and 32. 5 ordinary Portland cement can be produced when the admixing anount of waste concxete is less than 20%.Excitant Na2SiO3 mixes is 1% appropriately and the excitant NaOH has no obvious effect.

    • Study of solid volume ratio index of graded broken stone

      2010, 27(4):26-29.

      Abstract (138) HTML (0) PDF 573.30 K (541) Comment (0) Favorites

      Abstract:Solid volume ratio is an important control index for grading design of graded broken stone; this index has an important effect to the ability of strength and deformation resistance. Through a large number of experiments, this paper has studied the grading design and performance of aggregate affect to the solid volume ratio index,and has proposed the control value of solid volume ratio index. These are great helpful to the grading design and construction control of graded broken stone pavement.

    • Safety early-warning model of construction project based on rough set and support vector machine

      2010, 27(4):30-35.

      Abstract (640) HTML (0) PDF 1.54 M (538) Comment (0) Favorites

      Abstract:Aimed at the uncertainty of safety risk prediction in construction project currently, Rough set was used to pretreat the safety factors of construction project, and then the pretreatment results were put、the information structure of support by cetor macher(SVM)to traing and prediction. So the construction project safety risk early- warning model was estaldished, and the validity of the orithm was proved by empirical analysis. The MSE of SVM is 0. 011 5,by the BP neural network is 0. 070 7. Fxperimental re- sups revealed that the model of rough set一support vector machine(R.S一SVNI) can realize to delete the superfluous inputting information, to reduce the complexity and improve the interfere resistance. In small sample conditions, the early一warning model of RS- SVM is greatly superior to BP neural network in pre- diction precision and generalization ability.

    • Secondary start-up of O/A biological sand filters and its removal effect of nitrogen and carbon

      2010, 27(4):36-39.

      Abstract (666) HTML (0) PDF 505.75 K (497) Comment (0) Favorites

      Abstract:Effluent of municipal secondary treatment was chosen、raw water to re一start up the 0/A bio- logical sarxl filters which stopped running nearly five months, in the way of increasing hydraulic load grad- ually. The secondary start- up speed, the removal effect of nitrogen and cardon, the influen of C/N ra- do on removal effect of nitrogen and carbon were mainly studied. The resups showed that the membrane at- torched on the surface of quartz sand‘not dead, the 0/A biological sand filters can back to normal run in a very short time. During stable operation, the average removal of CODSCr and NH4+一Nwere 45. 53% and 65. 50% respectively, and the average concentration of CODSCr and NH4+一N in effluent were 48. 5Omg/L and 4. 12mg/L respectively. The removal efficiency of 0/A biological sand filters is high for total nitrogen when the C/N ratio us 5. 0; the removal rate of total nitrogen reaches above 30%,the average concentration of TN in effluent is lower than 15 mg/L. The effluent quality met the first A class standard of “urban sewage treatment plant pollutant discharge standard"(GB 18918- 2002).

    • Artificial influence on hydrochemistry of Fuyang river in Handan area

      2010, 27(4):40-45.

      Abstract (752) HTML (0) PDF 1.91 M (616) Comment (0) Favorites

      Abstract:Based on the systemic chemical analysis for the Fuyang River in Handan area,it is revealed that:(1) there mainly are five type waters as mainstream,karst,reservoir,coal mine drainage and city waste ones in this valley,among which the water types are HCO3·SO4-Na·Ca for mainstream,SO4·HCO3-Na·Ca for karst,HCO3·SO4-Mg·Ca for reservoir,HCO3·SO4-Na·Ca or CO3·SO4-Ca for coal mine drainage,and Cl·SO4-Ca·Na or Cl-Na for city waste waters,while the total dissolved solids(TDS) are less than 1 g/L for the former three type waters and great than 1 g/L for the latter two ones;(2) there is a trend of salinization and acidification for the river with the notable increase of concentrations of Ca2+,Mg2+,Na++K+,HCO3-,SO42-,Cl-and NH4+,and TDS values in the mainstream water along the river pathway starting from the Dongwushi Reservoir,and the decrease of pH value;(3) the salinization,acidification,nitrogen pollution and local heavy metal pollution for this river are the main hydrochemical characteristic of the river influenced by artificial factors,and the most important mechanisms of such an influence are manufactural evaporation,direct importing chemicals and intensification of chemichal weathering through environmental change.

    • An application of MM5-Models-3/CMAQ to simulate air pollutant characteristics in China

      2010, 27(4):46-51.

      Abstract (1049) HTML (0) PDF 846.38 K (613) Comment (0) Favorites

      Abstract:MMS一Models一3/CMAQ was applied to simulate the distribution of SO2,NO2 and PM in China by taking the January, April, July, October in 2005 for example. The comparison between simulation re- sups and monitoring data show that this model can simulate the spatial distrilxztion patterns of pollutants preferably, simulation results and the monitoring results are identical, especially for the Beijing-Tianjin 一Hebei region, Yangtze river delta and pearl river delta etc.In order to make up for the deficiency of monitoring data, the study applied satellite remote sensing data to the further verification of the simulation result, which include NO2 column concentration and aerosols optical thickness(AOD).The results showed that experimental results of the CMAQ calculation results were highly correlated to those of the satellite re- mote sensing data; this simulation system is a very good way to simulate the characteristics of the atmo- spheric pollutants in China.

    • Geological characteristics of CBM reservoir in the Xiangning mining area

      2010, 27(4):52-54.

      Abstract (869) HTML (0) PDF 959.85 K (775) Comment (0) Favorites

      Abstract:Coalbed methane(CBM) reservious is greatly affected by geological characteristics of coal seams. Based on analysis of a large number of experimental test's data, are study the geological properities of coal reservoir which include 3D of coal seams, coal petrology, coal chemistry, coal' s process feature, coal rank and coal fades, et al .The results showed that the key coal seams are stable spatial distribution, the coma- lative thickness is huge, coal quality is good and has a high degree of thermal evolution. It has a very good basic conditions for coalbed methane reservoir.

    • Kinematics modeling and simulation of double wishbone suspension based on ADAMS/Car

      2010, 27(4):55-58.

      Abstract (325) HTML (0) PDF 883.97 K (480) Comment (0) Favorites

      Abstract:The multi-body model of double- wishbone independent suspension was built by the use of vic- tual prototyping technology and the mechanical system dynamics analysis software ADAMS, the model was simulated to obtain the curve of toe angle,camber angle,caster angle and suspension stiffness orientation parameters with the wheels up and done the car' s movanent process, in the equilibrium position of the curve, the toe angle is in the zero point; Camber angle is slightly less than zero, it is about一0.03°;cash er angle is about 7.78°;kingpin indinat ion angle is about 9.4°.The simulation results compared with the prototype theoretical results show that the dynamic characteristics of the simulation models and the prototype vehicle suspension are basically the same, this method can accurately calculate the various performance of the suspension and improve the simulation precision and design efficiency.

    • Curve fitting of profile of cam based on harmonic analysis

      2010, 27(4):59-61.

      Abstract (469) HTML (0) PDF 413.22 K (429) Comment (0) Favorites

      Abstract:The harmonic function was used to reverse the arc cam concave of EUP, MATLAB software was applied to carry out the cam profile curve一fitting,and the author analyzed the performance of fuel- sup- plied cam according to the fitting results. The results shows that N's value is limited, which the main rea- son for the truncation error in fitting process.We can increase the N's value to obtain a higher accuracy; when the equal velocity section is large, cycle fuel injection quantity is stable and rate of increase is also relatively stable.

    • Optimal design of the motor base structure by the finite element analysis

      2010, 27(4):62-64.

      Abstract (139) HTML (0) PDF 1.43 M (376) Comment (0) Favorites

      Abstract:The optimization design parameter model of the base of explosion一proof motor has been estab- lished by using the finite element analysis software Ansys. Structure of the base has been optimized as well as the weight of the base as the objective function, during the optimization process, considering the stress constraints and the displacement constraints that the base suffered, and the integrated displacement and stress before and after optimization were compared with each other. The result shows that the displacement and stress have increased in pcrmitted rare after optimization. The result of optimization reduced greatly weight of the base in the case of the normal, stable operation, thus it could save a lot of raw materials for the mass production and it has important practical signfficance for lower production cost and could creates higher economic benefit.

    • The design research of axis of the milling cutter grinder based on the dynamic reliability

      2010, 27(4):65-68.

      Abstract (244) HTML (0) PDF 1.29 M (422) Comment (0) Favorites

      Abstract:The probability analysis was used in this paper. Natural frequency and of Excitation force fre- quency of every component in shafting system were considered to be the random variable. The distillation functions of natural frequency and of excitation force frequency were analyzed on the basis of special struc- ture and stress conditions. The dynamic reliability model of the axis was set up and dynamic reliability of the designed axis was worked out to provide the reference for structure designing; of axis.

    • Application of correlation dimension in pressure fluctuation of draft tube

      2010, 27(4):69-73.

      Abstract (813) HTML (0) PDF 977.75 K (528) Comment (0) Favorites

      Abstract:Based on the actual experiment signal of draft tube in Huangbizhuang unit, the time domain site nal h as been carried on the spectral analysis; embeddirg dimension and the correlation dimension also have been analyzed in different conditions of draft tube. Results show that when the embedding dimension is greater than or equal to 18, correlation dimension is tending to stability, so the minimum embedding di- mension is 18. And when the guide vane opening(a) is 50.70% and 62.85%,the correlation dimension 3. 4566 and 3. 3881 respectively. This can be ohtained that under different working conditions, correlation dimension is different, accordingly, the correlation dimension can be used as a conduit for pressure pulsa- tion of draft tube, and it can guide the stable operation of the power.

    • Application of Lyapunov exponent in weak signal detection

      2010, 27(4):74-77.

      Abstract (380) HTML (0) PDF 608.70 K (393) Comment (0) Favorites

      Abstract:Intuitionistic observations of phase and Melnikov have defaults in the judgment of system states in the weak signal detection based on the Doffing chaos oscillator. In order to improve the accuracy of the judgment of the system states reliability of signal detection, this paper proposed the method that use Lyapunov exponent to quantitatively judge and to analyze the states of the detection system. The Lyapunov exponent spectrum of the Doffing system was computed on the basis of states of the system judging by Lya- punov exponent; the author also analyzed the relationship among the amplitude of the inner drive signal, Lyapunov exponent and the system states. The results showed that Lyapunov exponent can quantitat ively and accurately judge the states of the detedion system.

    • Achieved through acoustic emission detection of the cylinder

      2010, 27(4):78-81.

      Abstract (262) HTML (0) PDF 428.26 K (302) Comment (0) Favorites

      Abstract:The paper introduced some methods about CLG steel cylinder non一destructive inspection,and appeared the superiority of the sofar shoot the exanination on the CLG steel cylinder non-destructive in- spection. At the same time, the paper described some questions need to pay attention and characteristics in the applications of rapid detection of on一line CLG steel cyliner and put up some improvanents methods; the author establish system of a simple data acquisition,analysis and processing. By using the system, the user not only can realize signal acquisitions and the frequency range of analysis but also can realize wavelet denoising. The results show that rapid detection of on line CNG steel cylinder is the feasible.

    • Model transformation based on ATLAS transformation language

      2010, 27(4):82-85.

      Abstract (530) HTML (0) PDF 596.72 K (469) Comment (0) Favorites

      Abstract:A model transformation framework is presented which accept model transformation signals with ATLAS transformation language. When Platform Independent Model(PILVI) transform to Platform Specialize Model(PSM),the signal sent by PILVI is judged by use of the ATLAS transformation language: if the signal belongs to the model transformation, the signal' s task would be executed; otherwise the feasible judgment would carzy on. If the signal is viable, it will return to the entrance waiting for the new signal,if not, the signal will be reported to the database and written in log.

    • A new cluster algorithm for DB parallel control

      2010, 27(4):86-91.

      Abstract (626) HTML (0) PDF 399.71 K (470) Comment (0) Favorites

      Abstract:In order to realize the large scale and high parallel perfonnance of database cluster system, the techniques of cluster are applied to the database system,and a comnon middleware system with high paral- lelism is proposed based on share一nothing database cluster, which provides the architecture of single sys- tem image for the clients and realizes the collaboration and parallel execution in the database cluster by us- ing the techniques of the meta data management, the multi一thread mechanism and the parallel transaction pre- processing,and it is well suitable for the high performance requirement of the OLTP commercial ap- plication and has an ideal price/performance ratio. The database cluster system not only keeps the auton+ my of the local database sites but also improves the parallel performance of the database cluster system and solves the performance bottleneck of large database system.

    • The application of AFD in enterprise's TPM

      2010, 27(4):92-94.

      Abstract (146) HTML (0) PDF 442.24 K (323) Comment (0) Favorites

      Abstract:Total Productive Maintenance(TPM)is an efficient path through enhancing productive to improve the coer competitiveness of enterprise. The objective and operation weakness of lack of identifying potential failure factor; systemically of TPM are introduced. The schemes of integrating AFD method are applied into TPM so as to improve correctness of establishing equipment maintenance items and to reduce the equipment failure. The validity of methods of integrating AFD into TPM is verified with an example.

    • Coupling synthesis of 4-(1-naphthyl) phenyl boronic acid

      2010, 27(4):95-97.

      Abstract (187) HTML (0) PDF 991.80 K (396) Comment (0) Favorites

      Abstract:Based on 4一bromo一aniline as raw materials, 1一hromo一4- iodohenzene was synthesized by diazotization reaction. Meanwhile, 1一naphthalene boronic acid was synthesized by Grinard reaction, us- ing 1一bromo-naphthalene as raw material Subsequently, they were used as materials to synthesize 4- (1一naphthyl) pherryl boronic acid by the Suzuki coupling reaction and n一Butyl lithium reaction suet, lively. The molecule structure and purity of products of every step were investigated by 1H NMR, GC and HPLC analysis. With a purity of 99.4% and the total yield of 20.5%,it shows that this process can he well applied to industrial production.

    • Uncertain means clustering

      2010, 27(4):98-100.

      Abstract (232) HTML (0) PDF 1.25 M (478) Comment (0) Favorites

      Abstract:In this paper, we firstly defined the classified weight according to the contribution of feature to sample which was used to determined the memdetship degree of sample to each cass and the weighed dis- tance between sample and each class, and then we proposed a new algorithm -the uncertain means cluster ing. The data of IRIS indicates that the algorithm possesses the better convergence, better robustness二〔1 it is an unsupervised clustering algorithm.

    • Uncertainty theory: a new branch of mathematics for studying uncertain systems

      2010, 27(4):101-105.

      Abstract (179) HTML (0) PDF 1.72 M (416) Comment (0) Favorites

      Abstract:Some information and knowledge are usually represented by human language in the real world. Uncertainty theory, a new branch of mathematics for studying uncertainty in human systems, is introluced in this paper. The study advance of uncertainty theory on loth theory section and practice section including uncertain statistics, uncertain finance, and uncertain reliability, are also introduced.

    • Study and implement of support vector machine algorithm

      2010, 27(4):106-108.

      Abstract (575) HTML (0) PDF 0.00 Byte (0) Comment (0) Favorites

      Abstract:Support vector machine has become the current hot spots in data mining research. This paper re- searches and analyzes three kirxls of classification algorithms such as C一SVM、υ一SVM、One一class SVM and the two regression algorithm such as ε- SVR、υ - SVR,the paper prove the efficiency of the al- gorithms through actual data simulation; Advantages, disadvantages and respective applications of the five kinds of algorithms are confirmed from the parameter selection,classffication accuracy,and mean square error and so on

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