检索结果-南通市图书馆

Two Phase Flow Simulation of Fractal Oil Reservoir Based on Meshless Method

Energy Engineering 2022年第2期119卷 653-664页

作者： Xian Zhou Fei Wang Ziyu Wang yunfeng xu School of Petroleum Engineering Yangtze UniversityWuhan430100China China Oilfield Services Limited TianjinChina Xinmin Oil Production Plant of Jilin Oilfield Company PetroChinaSongyuan138000China

The reservoir is the networked rock skeleton of an oil and gas trap,as well as the generic term for the fluid contained within pore fractures and karst *** and a complex internal pore structure characterize the reservoir *** introducing the fractal permeability formula,this paper establishes a fractal mathematical model of oil-water two-phase flow in an oil reservoir with heterogeneity characteristics and numerically solves the mathematical model using the weighted least squares meshless ***,the method’s correctness is verified by comparison to the exact *** numerical results demonstrate that the fractal oil-water two-phase flow mathematical model developed using the meshless method is capable of more accurately and efficiently describing the flow characteristics of the oil-water two-phase migration *** comparison to the conventional numerical model,this method achieves a greater degree of convergence and *** paper examines the effect of varying the initial viscosity of the oil,the initial formation pressure,and the production and injection ratios on daily oil production per well,water cut in the block,and accumulated oil in the *** 10 and 60 cp initial crude oil viscosities,the water cut can be 0.62 and 0.80,with 3100 and 1900 m^(3)cumulative oil *** pressures have little effect on *** this case,the daily oil production of well PRO1 is 1.7 m^(3)at 7 and 10 MPa initial *** cumulative oil production is 3465.4 and 2149.9m^(3)when the production injection ratio is 1.4 and *** two-phase meshless method described in this paper is essential for a rational and effective study of production dynamics patterns in complex reservoirs and the development of reservoir simulations of oil-water flow in heterogeneous reservoirs.

关键词： Oil-water two-phase flow fractal theory weighted least square method meshless method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Production Dynamic Prediction Method of Waterflooding Reservoir Based on Deep Convolution Generative Adversarial Network(DC-GAN)

引用

Energy Engineering 2022年第5期119卷 1905-1922页

作者： Liyuan Xin Xiang Rao Xiaoyin Peng yunfeng xu Jiating Chen Cooperative Innovation Center of Unconventional Oil and Gas(Ministry of Education&Hubei Province) Yangtze UniversityWuhan430100China Key Laboratory of Drilling and Production Engineering for Oil and Gas Wuhan430100China School of Petroleum Engineering Yangtze UniversityWuhan430100China

The rapid production dynamic prediction of water-flooding reservoirs based on well location deployment has been the basis of production optimization of water-flooding *** that the construction of geological models with traditional numerical simulation software is complicated,the computational efficiency of the simulation calculation is often low,and the numerical simulation tools need to be repeated iteratively in the process of model optimization,machine learning methods have been used for fast reservoir ***,traditional artificial neural network(ANN)has large degrees of freedom,slow convergence speed,and complex network *** paper aims to predict the production performance of water flooding reservoirs based on a deep convolutional generative adversarial network(DC-GAN)model,and establish a dynamic mapping relationship between well location deployment and output oil *** network structure is based on an improved U-Net *** a deep convolutional network and deconvolution network,the features of input well deployment images are extracted,and the stability of the adversarial model is *** training speed and accuracy of the proxy model are improved,and the oil saturation of water flooding reservoirs is dynamically *** results show that the trained DC-GAN has significant advantages in predicting oil saturation by the well-location employment *** cosine similarity between the oil saturation map given by the trained DC-GAN and the oil saturation map generated by the numerical simulator is *** above,DC-GAN is an effective method to conduct a proxy model to quickly predict the production performance of water flooding reservoirs.

关键词： Waterflooding reservoir well location deployment dynamic prediction DC-GAN

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research on the Pedestrian Re-Identification Method Based on Local Features and Gait Energy Images

引用

Computers, Materials & Continua 2020年第8期64卷 1185-1198页

作者： Xinliang Tang Xing Sun Zhenzhou Wang Pingping Yu Ning Cao yunfeng xu Hebei University of Science and Technology Shijiazhuang050000China School of Internet of Things and Software Technology Wuxi Vocational College of Science and TechnologyWuxi214028China Rutgers Business School-Newark Washington ParkNewarkNJ 07102USA

The appearance of pedestrians can vary greatly from image to image,and different pedestrians may look similar in a given *** similarities and variabilities in the appearance and clothing of individuals make the task of pedestrian re-identification very ***,a pedestrian re-identification method based on the fusion of local features and gait energy image(GEI)features is *** this method,the human body is divided into four regions according to joint *** color and texture of each region of the human body are extracted as local features,and GEI features of the pedestrian gait are also *** features are then fused with the local and GEI features of the *** distance measure learning using the cross-view quadratic discriminant analysis(XQDA)method is used to obtain the similarity of the metric function of the image pairs,and the final similarity is acquired by weight *** of experimental results by cumulative matching characteristic(CMC)curves reveals that,after fusion of local and GEI features,the pedestrian re-identification effect is improved compared with existing methods and is notably better than the recognition rate of pedestrian re-identification with a single feature.

关键词： Local features gait energy image weight independent distance metric cross-view quadratic discriminant analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structural and functional properties of hydrolyzed/glycosylated ovalbumin under spray drying and microwave freeze drying

引用

Food Science and Human Wellness 2020年第1期9卷 80-87页

作者： Lili Liu Xiaoning Dai Huaibin Kang yunfeng xu Weiming Hao Food and Biology Engineering College Henan University of Science&Technology471003LuoyangChina

Ovalbumin(OVA),the main protein in egg white,affects most of the functional properties of egg white protein in food *** aim of this study was to investigate the effects of spray drying(SD)and microwave freeze drying(MFD)on the preparation of hydrolyzed/glycosylated ovalbumin(HGOVA)and provide useful information on the applications of egg protein powders in the food *** demonstrated that the structure of HGOVA was considerably changed,and its functional properties were improved compared with those of native *** and MFD processing did not lead to dissociation of HGOVA ***-HGOVA exhibited higher protein solubility,emulsifying activity,foaming capacities,and gel hardness than ***,MFD-HGOVA was better than the SD-HGOVA in terms of color,emulsion stability,foam stability,water/oil absorption capacity,and thermal *** of an appropriate drying method could enhance the potential applications of HGOVA in the food industry.

关键词： Ovalbumin Glycosylation Spray drying Microwave freeze drying

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Identification of a major QTL for Hessian fly resistance in wheat cultivar‘Chokwang’

引用

The Crop Journal 2022年第3期10卷 775-782页

作者： Lirong Zhang yunfeng xu Ming-Shun Chen Zhenqi Su Yang Liu Yuzhou xu Guixiao La Guihua Bai Department of Plant Pathology College of Plant ProtectionHebei Agricultural UniversityBaoding 071001HebeiChina Department of Agronomy Kansas State UniversityManhattanKS 66506USA Technological Innovation Center for Biological Control of Crop Diseases and Insect Pests of Hebei Province Baoding 071001HebeiChina Hard Winter Wheat Genetics Research Unit USDA-ARSManhattanKS 66506USA State Key Laboratory for Agrobiotechnology and Key Laboratory of Crop Heterosis and Utilization(MOE)and Beijing Key Laboratory of Crop Genetic Improvement China Agricultural UniversityBeijing 100193China Institute of South Subtropical Crops Chinese Academy of Tropical Agricultural SciencesZhanjiang 524013GuangdongChina Industrial Crop Research Institute Henan Academy of Agricultural SciencesZhengzhou 450002HenanChina

The Hessian fly(HF,Mayetiola destructor)is one of the destructive pests of wheat(Triticum aestivum L.)*** cultivars can effectively minimize wheat damage due to this insect *** identify new quantitative trait loci(QTL)for HF resistance,a population of recombinant inbred lines(RILs)was developed from a cross between the HF-resistant wheat cultivar‘Chokwang’and susceptible wheat‘Ning 7840’,and phenotyped for responses to HF attack.A linkage map was constructed using 1147 single nucleotide polymorphism(SNP)markers generated from genotyping-by-sequencing(GBS).One major QTL,***-6 BS,for HF-resistance was identified on chromosome arm 6 BS,which explained up to84.0%of the phenotypic variation and was contributed by *** RILs showed recombination in the candidate interval of ***-6 BS,which delimited ***-6 BS to a 4.75 Mb physical interval between 6,028,601 bp and 10,779,424 bp on chromosome arm 6 BS of IWGSC Chinese Spring reference genome Ref Seq *** GBS-SNPs in the candidate interval were converted into Kompetitive allele specific polymerase chain reaction(KASP)*** of them,KASP-6 B112698 and KASP-6 B7901215,were validated in a *** wheat ***-6 B112698 was nearly diagnostic,thus can be used to screen ***-6 BS and pyramid it with other resistance genes in breeding programs.

关键词： Wheat Hessian fly resistance Mayetiola destructor KASP GBS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Nonuniform Clustering Routing Algorithm Based on an Improved K-Means Algorithm

引用

Computers, Materials & Continua 2020年第9期64卷 1725-1739页

作者： Xinliang Tang Man Zhang Pingping Yu Wei Liu Ning Cao yunfeng xu School of Information Science and Engineering Hebei University of Science and TechnologyShijiazhuang050000China Hebei Chemical and Pharmaceutical College Hebei Seismological BureauShijiazhuang050000China School of Internet of Things and Software Technology Wuxi Vocational College of Science and TechnologyWuxi214028China Rutgers Business School-Newark Washington ParkNewarkNJ 07102USA

In a large-scale wireless sensor network(WSN),densely distributed sensor nodes process a large amount of *** aggregation of data in a network can consume a great amount of *** balance and reduce the energy consumption of nodes in a WSN and extend the network life,this paper proposes a nonuniform clustering routing algorithm based on the improved K-means *** algorithm uses a clustering method to form and optimize clusters,and it selects appropriate cluster heads to balance network energy consumption and extend the life cycle of the *** ensure that the cluster head(CH)selection in the network is fair and that the location of the selected CH is not concentrated within a certain range,we chose the appropriate CH competition *** results show that,compared with LEACH,LEACH-C,and the DEEC clustering algorithm,this algorithm can effectively balance the energy consumption of the CH and extend the network life.

关键词： WSN node energy consumption nonuniform clustering routing algorithm

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tetra-armed conjugated microporous polymers for gas adsorption and photocatalytic hydrogen evolution

引用

Science China Chemistry 2017年第8期60卷 1075-1083页

作者： yunfeng xu Chong Zhang Pan Mu Na Mao xue Wang Qian He Feng Wang Jia-Xing Jiang Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of Technology Wuhan 430073 China

Two novel tetra-armed conjugated microporous polymers with different geometries have been designed and synthesized via Suzuki-Miyaura cross coupling polycondensation. Both polymers are stable in various organic solvents tested and are thermally stable. The pyrene-containing polymer of PrPy with the rigid pyrene unit shows a higher Brunauer-Emmet-Teller specific surface area of 1219m2g-1 than the tetraphenylethylene-containing polymer of PrTPE （770m2g 1）, which leads to a high CO2 uptake ability of 3.89mmolg I at 1.13bar/273K and a H2 uptake ability of 1.69wt% at 1.13bar/77K. The photocatalytic hydrogen production experiments revealed that PrPy also shows a better photocatalytic performance than PrTPE due to the higher conjugation degree and planar structure, the broader UV-visible （UV-Vis） absorption, the lower photoluminescence lifetime, and the higher specific surface area.

关键词： perylene conjugated mieroporous polymers gas adsorption hydrogen evolution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical simulation of particle motion at cucumber straw grinding process based on EDEM

引用

International Journal of Agricultural and Biological Engineering 2020年第6期13卷 227-235页

作者： yunfeng xu Xiliang Zhang Shuo Wu Cheng Chen Jizhang Wang Shouqi Yuan Bin Chen Pingping Li Rongjun xu National Research Center of Pumps Jiangsu UniversityZhenjiang 212013JiangsuChina Lanshen Group Co. Ltd.Nanjing 211500China School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education and Jiangsu ProvinceJiangsu UniversityZhenjiang 212013JiangsuChina College of Biology and Environment Nanjing Forestry UniversityNanjing 210037China

Simulation of straw grinding process based on discrete element method(DEM)was *** to the force analysis and kinematics analysis,the differential equation of straw particle motion on hammers was deduced,and the formation mechanism of the material circulation layer was *** model of grinder,particle model and contact model were established by EDEM *** influence of hammer number,hammer thickness and gap of the hammer-sieve on particle grinding number and power consumption were obtained by single factor simulation *** grinding process is divided into three *** hammer smashing plays a dominant role in 0-0.25 *** the hammer smashing particle number increases slowly and then decreases to the lowest level in 0.25-0.60 s,the tooth plate smashing particle number increases rapidly and dominates,and then forming a material circulation *** hammer and tooth plate smashing particle number is basically stable in 0.60-2.00 s,and the tooth plate smashing occupies the dominant *** the increase of the number and thickness of hammers,the power consumption of crusher tends to increase,and with the increase of the gap between hammers and sieves,the power consumption of crusher decreases first and then *** results can provide guidance for the development of high-efficiency and energy-saving grinding equipment for cucumber straw.

关键词： cucumber straw grinding process particle motion numerical simulation EDEM

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tensile mechanical properties of greenhouse cucumber cane

引用

International Journal of Agricultural and Biological Engineering 2016年第5期9卷 1-8页

作者： xu yunfeng Zhang Xiliang Sun Xiaojia Wang Jizhang Liu Jizhan Li Zhiguo Guo Qian Li Pingping Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education and Jiangsu ProvinceInstitute of Agricultural EngineeringJiangsu UniversityZhenjiang 212013China School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China University of Birmingham EdgbastonBirminghamB152TTUK College of Forest Resource and Environment Nanjing Forestry UniversityNanjing 210037China

To obtain the mechanical properties of greenhouse cucumber cane,tensile and shear properties of the greenhouse cucumber cane were studied by using computer-controlled electronic universal testing machine and homemade cutting test bench,***,the root,middle and head of cucumber cane were subjected for tensile *** tensile stress-strain curves showed that the root of cumber cane presented the characteristics of plastic material,while the middle and head showed the characteristics of brittle *** average tensile strength of root,middle and head of fresh cucumber cane were 7.35 MPa,6.30 MPa and 4.68 MPa,*** average elastic modulus of root of fresh cucumber cane was 280.58 MPa,which was much greater than the middle and head with average elastic modulus of 198.81 MPa and 137.22 MPa,respectively.A pendulum impact cutting test-rig and a cutting force measurement system composed of a cantilever weigh sensor,a high frequency DAQ card and motion control card were *** cutting mechanical property experiments of different parts of greenhouse cucumber cane were carried out,and the continuous curves of cutting force were *** single factor test for cross-sectional area,cutting speed,cutting tool type and manner were *** results indicated that the peak cutting force increased approximately linearly with the increasing of cutting sectional area,but decreased gradually with the increasing of cutting *** the same conditions,the cutting force could be reduced by using straight blade cutting tool and ramp cutting *** the multifactor interaction impact test of the cutting way,the blade type and the cutting speed,it was found that the corresponding F-value of the three factors were 21.316,49.141 and 0.222,which suggests that the blade type is the most significant factor for the cutting force.

关键词： cucumber cane mechanical properties modulus of elasticity tensile strength cutting force

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Novel Forensic Computing Model

引用

Wuhan University Journal of Natural Sciences 2006年第6期11卷 1865-1868页

作者： xu yunfeng LU Yansheng Public Information Network Security Supervision Bureau Department of Public Security of Hubei Province Wuhan 430070 Hubei China College of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

According to the requirement of computer forensic and network forensic, a novel forensic computing model is presented, which exploits XML/OEM/RM data model, Data fusion technology, forensic knowledgebase, inference mechanism of expert system and evidence mining engine. This model takes advantage of flexility and openness, so it can be widely used in mining evidence.

关键词： forensic computing data fusion inference mechanism hidden Markov model petri network

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：