MAIN ABSTRACTS

MAIN ABSTRACTS

1Compressed Sensing Image Reconstruction Algorithm Based on Contourlet Transform and Alternating Direction MethodZouJian(YangtzeUniversity,Jingzhou434023) Abstract: In traditional compressed sensing (CS)image reconstruction, wavelet transform is usually used to express the sparse images，but can hardly capture the information of image curves and edges. In this paper, a new CS reconstruction algorithm based on and alternating direction method is presented. The Contourlet transform is first used to express the sparse images and the alternating direction method is used reconstruct the original image. Contrast with wavelet based method, the proposed method not only can enforce the curve sparsity of images with fast computation, but also outperform on reconstruction accuracy.Numerical results show the effectiveness of the proposed algorithm. Key words: compressed sensing; image reconstruction; Contourlet transform; alternating direction method

6Research on Localization Algorithm Based on Cobweb Structure and HyperbolaOuyangLinqun，RuanChengzhi(WuyiUniversity,Wuyishan354300) Abstract: In order to improve the accuracy of cobweb localization algorithm, a localization algorithm based on cobweb structure and hyperbola is proposed in this paper.Firstly, the radio frequency reference tags are placed according to the topology structure of the cobweb, and a reader is installed in the center of the cobweb. Secondly, the main chord node and the auxiliary chord node in cobweb structure are respectively used to construct concentric circles, the nearest concentric circle to the texted tag is obtained.Then, the hyperbolic relationship of coordinates between reference tags and texted tags are determined in the concentric circle, the method of maximum likelihood estimation is adopted to obtain the coordinates of texted tags. Finally, the accuracy of the proposed algorithm is calculated. Compared with the popular cobweb localization algorithm, the effectiveness of the proposed algorithm is verified. Key words: RFID; cobweb topology structure; hyperbolic location; location algorithm

11 Study on the Adsorption of Pb2+Waste Water with Epichlorohydrin Modified Orange PeelYangWeisen,JianShaoju,YeMingwei(FujianKeyLaboratoryofEco-IndustrialGreenTechnology(WuyiUniversity),FujianBambooEngineeringTechnologyResearchCenter(WuyiUniversity),WuyiUniversity,Wuyishan354300) Abstract: In order to make resource utilization of orange peel, the orange peel is modified with epichlorohydrin and sodium hydroxide for a modified adsorption of orange peel.SEM is used to characterize the surface morphology of orange peel before and after modification.The adsorption of modified orange peel was studied through single factor test and the adsorption conditions for Pb2+by the modified orange peel were optimized through the orthogonal test.SEM analysis indicated that the surface of orange peel after modification changed a lot.The single factor test is used to investigate the effect of adsorption of Pb2+and its adsorption conditions are optimized through orthogonal test.SEM analysis indicates that obvious change is taken place on the surface of modified orange peel, followed by pH,absorbent dosage and epichlorohydrin dosage.The optimum adsorption conditions are initial concentration of 350mg/L, pH of 6, absorbent dosage of 6g/L, and epichlorohydrin dosage of 5ml, under the condiitions,the adsorption capacity of Pb2+is 25.13mg/g.The study provides a theoretical reference for comprehensive utilization of orange peel and the treatment on Pb2+in the waste water. Key words：orange peel; biological adsorbent; Pb2+solution; adsorption

16 Adsorption of Humic Acid on the Surface of Modified Bamboo PowderXieYu(WuyiUniversity,FujianKeyLaboratoryofEco-industrialGreenTechnology(WuyiUniversity),Wuyishan354300)SongWeijun,YouXiaoqin(WuyiUniversity,Wuyishan354300) Abstract：Primarily bamboo powder is modified with surfactants so as to improve the adsorption performance for the bamboo powder.Single factor test and orthogonal test are carried out to study the better condition of humic acid on the bamboo powder, and the thermaldynamic model and dynamic model for the adsorption are analyzed as well. The results indicate that after treatment, CTAB has good effect on surface modification of bamboo powder, the optimal adsorption capacity is acquired at a pH value of 6, at temperature of 30℃ and at oscillation time of 60min, 85mg modified bamboo powder is added into the system, the humic acid could be adsorbed at a rate of 97.8%. The order of influence of CTAB-BP on the removal rate of humic acid is：temperature>initial concentration of humic acid > dosages of CTAB-BP> adsorption time>pH. The test data are well consistent with Freundlich Model.The adsorption process is heat release and a preferential adsorption of non-spontaneous and multi-molecular layer.The dynamic adsorption results demonstrate that the modified bamboo powder follows a pseudo-second order model (Δq<2.3%,R2> 0.999). Key words：modified bamboo powder；humic acid；adsorption

22 The Application of Reservoir Numerical Simulation Technology in Low Permeability and Carbonate Heavy-oil ReservoirsLIChunxia(ChinaUniversityofMining&Technology(Beijing),Beijing100083)GaoYuepeng(YangtzeUniversity,Wuhan430100;BohaiDrillingEngineeringCo.Ltd.,CNPC,Tianjin300280) Abstract: S Reservoir of D Oilfield in the Middle East is a typical low permeability and carbonate heavy oil reservoir. The development result of this reservoir is poor under the current well patterns and producing methods because of its characteristics of low permeability and heavy oil. Thus, the analysis of reservoir reserves utilization situation is the key factor for the decisions of subsequent producing strategies. In this paper, the reservoir numerical simulation, which is based on reservoir geological model and producing dynamic curves, is used for the analysis of reserves utilization and improving its decision of producing strategies.The research results show that because of the thicker oil layer and imperfect well pattern, there is a great difference between the reservoir interlayer and plane. Here, the method of “Three-dimensional infill well patterns” is suggested, which can effectively improve the utilization degree of reservoir reserves and enhance the oil recovery. Key words: reservoir numerical simulation; low permeability; carbonate reservoir; heavy oil

27 The Effect of Content of Lost Circulation Material while Drilling on the Load Bearing Capacity of Fractured LimestoneLiJunwei(YangtzeUniversity，Wuhan430100;ChinaOilfieldServicesLimited,Yanjiao065201)MaMeng(YangtzeUniversity，Jingzhou434023)YangHongbo,MaDexin(ChinaOilfieldServicesLimited,Yanjiao065201) Abstract: The low load bearing capacity induced by lost circulation is a vital challenge during drilling of fractured limestone, plugging while drilling is an effective way to solve the problem. High load bearing capacity of formation is to decide the scope of drilling fluid density and down hole pressure during cementing after plugging operation.It is the key to balance the collapse pressure and ensure cement quality.Because there is no available experience， the relevant research is performed for fractured limestone.The result shows that the high the content of the lost circulation material is，the high the formation pressure is, the stronger the bearing capacity of formation is.The larger the porosity is，the low the bearing capacity in formation is. The technology is used in Missan Oilfield for drilling, the increase of bearing capacity in formation is 0.27～0.34g/cm3. The method was successfully applied in Missan oilfield and increased bearing pressure by 0.27～0.34g/cm3. As a result the operation performed is without the stick of tool during the drilling and it achieves good quality. The technique provides reference for similar operations. Key words: content of lost circulation material while drilling；fractured limestone；load bearing capacity of formation；Missan Oilfield

34 Reservoir Characteristics and Sensitivity Evaluation of Guantao Formation in LD21-2 OilfieldDaiKai，HuangXiaoxia，HuWei，GanXiuyu，YueQiansheng(YangtzeUniversity，Jingzhou434023) Abstract: The reservoir characteristics of Guantao Formation in LD21-2 Oilfield are analyzed by X-ray diffraction, scanning electron microscopy and mercury intrusion analysis, and the reservoir sensitivity is evaluated. The test results show that Guantao Formation belongs to a high-porosity and high-permeability reservoir, its pore type is mainly the intergranular pores with pore development and good connectivity. The clay minerals are mainly composed of the interstratification of illite and montmorillonite, followed by kaolinite, illite and chlorite. The sensitivity evaluation indicates that there is a strong velocity-sensitivity, medium-strong water-sensitivity and salt-sensitivity, weak acid-sensitivity and base-sensitivity, and medium-weak stress-sensitivity. While the critical velocity is 3.6m/d, the critical mineralization degree is 2500mg/L, the critical pH is 7. Fluid into the well should be improved for its inhibitory in the process of drilling and completion, rational production speed should be controlled in the process of production. Key words:reservoir characteristics；sensitivity evaluation；formation protection；clay mineral

37 Selective Ensemble Data Stream Classification Based on Ant Colony OptimizationWangJun，LiuSanmin，LiuTao(AnhuiPolytechnicUniversity,Wuhu241000) Abstract: Data streams classification based on ensemble learning has become one of the current research hotspots, which exists many disadvantages, such as the large volume, long training time and higher complexity. To solve these problems, the new selective ensemble data stream classification method is presented based on ant colony algorithm. The method uses the classification accuracy and the classifier’s difference as the classifier selection criteria, the ant colony optimization algorithm is used to select the base classifiers with high classification accuracy and large individual difference to construct the ensemble classification model. Lastly, simulation experiment is carried out on the standard dataset, the experiment results show that the presented method is superior to the traditional ensemble methods in classification accuracy and stability. Key words: data stream classification；concept drift；selective integration；ant colony optimization；difference

44 Method for Obtaining Review-oriented Product Improved RequirementsWuDongsheng,WangZhongqun,JiangSheng,HuangSubing(AnhuiPolytechnicUniversity，Wuhu241000) Abstract: Based on the syntactic dependency between product features and opinion words in the version of online product review, this paper proposes a method that combined with the user’s attention and viewpoint value or feature modifier for acquiring the improved requirements for products. Experimental results show that the proposed method can obtain improved requirements for product effectively, it provides the direction of product improvement. Key words: online product reviews; product improved requirements; product features

49 Design and Realization of Tuning-fork Fluid Density DetectorWangShanshan,WuLingyun,YuHouquan(YangtzeUniversity,Jingzhou434023)ChenQiang(ChinaPetroleumLoggingCo.Ltd.,Xi’an710077)GuoShuai(BohaiDrillingEngineeringCo.Ltd.,CNPC,Tianjin300280) Abstract: Aiming at the shortcomings of the existing downhole fluid density detection method, a tuning fork type fluid density detection method is proposed. On the basis of principle of one-to-one function relation between the resonance frequency of the tuning fork sensor and fluid density to be detected，a closed loop design of self-excited oscillation is proposed. This design is to detect the frequency of the sensor signal feedback to tuning fork and make its self-excited oscillation. A tuning fork type fluid density detection device is designed by measuring the vibration frequency to measure the liquid density. The experimental results show that the maximum measuring error is 0.0065g/cm3and the resolution can reach 0.01g/cm3at the density of 0.832～1.27g/cm3measurement range. The designed device can meet the requirements of high precision fluid density measurement. Key words: piezoelectric tuning fork; fluid density；phase-locked loop；self-exciting driving; resonance-frequency

54 Stability Analysis of Cut Slope in Large Area Site Leveling Project in Mountainous AreasShaoXianfeng(ResearchInstituteofEconomicsandTechnology,StateGridElectricPowerCompanyofAnhuiProvince,Hefei230601)LiDahua,LiQiuxi(AnhuiJianzhuUniversity,Hefei230601) Abstract：In order to study the slope stability in the southern mountain areas of Anhui Province under complicated conditions, combined with the State Grid ±1100kV convertor station slope construction project in Xuancheng City, MIDAS GTS is used to establish the two-dimensional model of the slope, and the numerical calculation is carried out by selecting the suitable geological parameters, The safety factor of the original slope is obtained to analyze the stability of the original slope. A large scale finite element software MIDAS GTS is applied to simulate the treatment scheme, by which the rationality and effectiveness of the reinforcement measures are verified, the monitoring value of slope displacement and the simulation value of MIDAS GTS software are compared. The consistency between the simulated value and the monitoring value of MIDAS GTS software proves that MIDAS GTS is worth to be popularized and applied in engineering, and it can provide reference for similar projects in the future. Key words: slope stability; MIDAS GTS; simulation analysis; monitoring value

60 Study on the Mechanic and Deformation Characteristics of Interaction of Pile-anchor in Foundation Pit Supporting StructureChenHan,LeiMing,ChengCheng,WangZhonglin(YangtzeUniversity,Jingzhou434023) Abstract: The pile-anchor supporting system is commonly used in foundation pit engineering and widely used in engineering practice because of its unique support characteristics and mechanical performance. In order to research the mechanic deformation characteristics of the pile-anchor structure, combined with a deep foundation pit engineering example, the finite element software MIDAS GTS NX is used to analyze the mechanic deformation law of the pile-anchor supporting structure that consisted of pre-stressed bolt and common bolt grouting.Results show that after the excavation is to the end, the maximum horizontal displacement of the pile is 13mm and the maximum axial force of the pre-stressed anchor is 145kN of the supporting structure with pile and pre-stressed anchor; the maximum horizontal displacement of the pile is 28mm and the maximum axial force of the grouting bolt is 53kN of the supporting structure with pile and ordinary bolt grouting bolt. Compared to common grouting bolt, pre-stressed anchor has good ability to limit the deformation. Research results can provide some references for the similar projects. Key words: foundation pit supporting; MIDAS; pre-stressed anchor; grouting bolt

64 Experimental Study on Unconfined Compressive Strength of Cemented SoilXiaoTaoli，HeYunlong,LiQifeng,DingZhuo,ZhuJianhua,ZhouChao(YangtzeUniversity,Jingzhou434023) Abstract: With miscellaneous fill soil used for the soil from a common construction site, cement is added to form a cement reinforced soil，and microcomputer is used to control the electro-hydraulic servo universal testing machine as well as the modified high-speed mixer for indoor test. The water-cement ratio is unchanged during the test, the variation law of unconfined compressive strength of cement soil under different cement contents and different ages is studied, the compressive strength values of cement mortar under various conditions are obtained, and the function expression of cement soil strength can be obtained by data analysis. The results show that the compressive strength of cement soil increases with the increase of cement content; when the content is 25%, the strength of cement soil increases to the maximum; the relationship between the compressive strength of cement soil and the growth of the age is closely related, with the cubic function, when the age is 60d, the strength of cement soil is higher than that of 90d. The research results can provide theoretical reference for basic engineering such as foundation engineering or foundation pit support design with miscellaneous fill soil. Key words: cement soil; unconfined compressive strength; cement content; age; miscellaneous filling soil

Translated & Edited by SU Kai-ke(蘇開(kāi)科)