检索结果-南通市图书馆

The application of machine learning under supervision in identification of shale lamina combination types——A case study of Chang 7_(3)sub-member organic-rich shales in the Triassic Yanchang Formation,Ordos Basin,NW China

引用

Petroleum Science 2021年第6期18卷 1619-1629页

作者： yuan-yuan Zhang Ke-Lai Xi Ying-Chang Cao bao-hai yu Hao Wang Mi-Ruo Lin Ke Li Yang-Yang Zhang Deep Oil and Gas Key Laboratory China University of Petroleum(East China)QingdaoShandong 266580China No.7 Oil Recovery Plant of PetroChina Changqing Oilfield Company Xi'anShaanxi 710000China Fengcheng Oil Recovery Plant of PetroChina Xinjiang Oilfield Company KaramayXinjiang 834000China

Organic rich laminated shale is one type of favorable reservoirs for exploration and development of continental shale oil in ***,with limited geological data,it is difficult to predict the spatial distribution of laminated shale with great vertical *** solve this problem,taking Chang 73 sub-member in Yanchang Formation of Ordos Basin as an example,an idea of predicting lamina combinations by combining'conventional log data-mineral composition prediction-lamina combination type identification'has been worked out based on machine learning under supervision on the premise of adequate knowledge of characteristics of lamina mineral ***,the main mineral components of the work area were figured out by analyzing core data,and the log data sensitive to changes of the mineral components was extracted;then machine learning was used to construct the mapping relationship between the two;based on the variations in mineral composition,the lamina combination types in typical wells of the research area were identified to verify the *** results show the approach of'conventional log data-mineral composition prediction-lamina combination type identification'works well in identifying the types of shale lamina *** approach was applied to Chang 73 sub-member in Yanchang Formation of Ordos Basin to find out planar distribution characteristics of the laminae.

关键词： Organic-rich shale Laminae combination Conventional logs Machine learning Ordos Basin

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

Effects of seasonal water-level fluctuation on soil pore structure in the Three Gorges Reservoir,China

引用

Journal of Mountain Science 2018年第10期15卷 2192-2206页

作者： ZHANG Shu-juan TANG Qiang bao yu-hai HE Xiu-bin TIAN Feng-xia LüFa-you WANG Ming-feng Raheel ANJUM Key Laboratory of Mountain Surface Process and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Sustainable Agriculture Sciences Department Rothamsted ResearchNorth WykeOkehamptonDevonEX202SBUK Abdul Wali Khan University Mardan 23200Pakistan

Inundation of the Three Gorges Reservoir has created a 30-m water-level fluctuation zone with seasonal hydrological alternations of submergence and exposure, which may greatly affect soil properties and bank stability. The aim of this study was to investigate the response of soil pore structure to seasonal water-level fluctuation in the reservoir, and particularly, the hydrological change of wetting and drying cycles. Soil pore structure was visualized with industrial X-ray computed tomography and digital image analysis techniques. The results showed that soil total porosity(? 100 ?m), total pore number, total throat number, and mean throat surface area increased significantly under wetting and drying cycles. Soil porosity, pore number and throat numberwithin each size class increased in the course of wetting and drying cycles. The coordination number, degree of anisotropy and fractal dimension were indicating an increase. In contrast, the mean shape factor, pore-throat ratio, and Euler-Poincaré number decreased due to wetting and drying cycles. These illustrated that the wetting and drying cycles made soil pore structure become more porous, continuous, heterogeneous and complex. It can thus be deduced that the water-level fluctuation would modify soil porosity, pore size distribution, and pore morphology in the Three Gorges Reservoir, which may have profound implications for soil processes, soil functions, and bank stability.

关键词： Soil pore structure X-ray computed tomography Image analysis Wetting and drying cycles Water-level fluctuation Three Gorges

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

Features and formulae of sediment incipient motion in vegetated flow environment

引用

Journal of Hydrodynamics 2024年第2期36卷 331-339页

作者： yu-xuan Xu Wei-jie Wang Shi-bao Zhang Han-qing Zhao Xue-kai Chen hai-ping Zhang School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou450045China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing100038China China Three Gorges Corporation Wuhan430010China

Aquatic vegetation is a vital component of natural river ecosystems,playing a crucial role in maintaining ecological balance,providing habitat and improving water ***,the presence of vegetation results in increased resistance in vegetated channels compared with non-vegetated channels,rendering traditional sediment movement predictions inadequate for the ***,the concept of a vegetation influence factor,denoted by CDah,has been proposed by previous researchers to represent the effect of vegetation on sediment movement in *** this study,we focus on exploring the vegetation resistance coefficient(CD)among the vegetation influence factors,evaluating two different calculation methods for vegetation resistance coefficient,and presenting two expressions through genetic algorithm analysis to predict the incipient flow velocity of sediment in vegetated *** predicted values from the new formulae show excellent agreement with measured data,highlighting the high accuracy of the proposed methods in predicting the incipient flow velocity of *** results provide a solid theoretical basis for understanding the influence of aquatic vegetation on sediment particle movement.

关键词： Vegetation flow vegetation resistance coefficient genetic algorithm sediment initiation

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

Investigating impacts of different building contents on the post-earthquake evacuation time using an agent-based model with considering turning behavior

引用

Earthquake Engineering and Engineering Vibration 2024年第4期23卷 939-955页

作者： bao yu School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572025China

Accurate assessment of crowd evacuation inside the post-earthquake environment is critical from many perspectives,but this issue receives much less attention compared to the seismic losses of structural and non-structural *** could be attributed to the fact that post-earthquake evacuation analysis is complex due to the interaction between human behavior and the actual built environment induced by different building *** study attempts to tackle this problem by investigating the impacts of different building contents on post-earthquake evacuation time by using an agent-based model that considers turning *** this end,the agent-based model is first described,including:properties of the agent-based model with turning behavior,key aspects in its formulation considering different evacuation stages,and influence of different building contents(namely,debris from partition walls and ceiling systems,and various types of equipment)on the agent’s ***,a school building is used as a benchmark problem to validate the model without earthquake,and the findings indicate that the agent-based model can match the real safety drill results reasonably *** the validation,the school building is subsequently designed in accordance with modern seismic design codes,and the influence of debris and equipment on post-earthquake evacuation time is quantitatively studied using a suite of pulse-type ground motions as *** on this case study,recommendations are made for structural and architectural designers in an effort to reduce the potential evacuation ***,debris induced by partition walls or ceiling systems should be controlled as it has the greatest impact on the total evacuation time.

关键词： seismic fragility evacuation agent-based model route choice built environment

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

Research progress of slippage characteristic and gas film stability enhancement methods on biomimetic hydrophobic surfaces

引用

Journal of Hydrodynamics 2024年第1期36卷 87-101页

作者： Meng-zhuo Zhang hai-bao Hu Liu-zhen Ren Lu-yao bao Jun Wen Luo Xie School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an710072China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen518063China

The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of surface comes from the interfacial *** now,it is a hotspot to grasp the slippage characteristic and explore slippage enhancement *** paper not only summarizes our numerical simulation and experimental results of slippage characteristic at the solid-liquid interface(SLI)of hydrophobic surfaces(HS)and the gas-liquid interface(GLI)of superhydrophobic surfaces(SHS)in recent years,but also introduces some innovative methods that can effectively improve the gas film stability and drag reduction effect of ***,we used the molecular dynamics(MD)simulation method to figure out the effect of the solid-liquid interaction strength,the system temperature and the shear rate on the slippage of SLI,and expound their action mechanism from molecular ***,by MD and multibody dissipative particle dynamics(MDPD)method,the slippage behavior at the GLI was studied under the influence of the microstructure size and the flow driving *** proposed a new kind of hybrid slip boundary condition model to describe the slippage characteristic on *** addition,we found through experiment that a three-dimensional backflow will appear on the GLI under the interfacial adsorption of surfactants,and the backflow direction will reverse with the change of GLI ***,we put forward the wettability step structure and gas injection method to enhance the stability and drag reduction effect of the gas film on SHS.

关键词： Hydrophobic surface superhydrophobic surface interfacial slip underwater drag reduction

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

Hybrid tri-memristor hyperchaotic map and application in Wasserstein Generative Adversarial Nets

引用

Science China(Technological Sciences) 2024年第6期67卷 1855-1865页

作者： GU Yang bao Han yu XiHong HUA Zhongyun bao BoCheng XU Quan School of Microelectronics and Control Engineering Changzhou UniversityChangzhou213159China School of Computer Science and Technology Harbin Institute of TechnologyShenzhen518055China

Inspired by basic circuit connection methods,memristors can also be utilized in the construction of complex discrete chaotic *** investigate the dynamical effects of hybrid memristors,we propose two hybrid tri-memristor hyperchaotic(HTMH)mapping structures based on the hybrid parallel/cascade and cascade/parallel operations,*** the HTMH mapping structure with hybrid parallel/cascade operation as an example,this map possesses a spatial invariant set whose stability is closely related to the initial states of the *** distributions and bifurcation behaviours dependent on the control parameters are explored with numerical ***,the memristor initial offset-boosting mechanism is theoretically demonstrated,and memristor initial offset-boosting behaviours are numerically *** results clarify that the HTMH map can exhibit hyperchaotic behaviours and extreme multistability with homogeneous coexisting infinite *** addition,an FPGA hardware platform is fabricated to implement the HTMH map and generate pseudorandom numbers(PRNs)with high ***,the generated PRNs can be applied in Wasserstein generative adversarial nets(WGANs)to enhance training stability and generation capability.

关键词： memristor hybrid tri-memristor map spatial invariant set hyperchaos extreme multistability generative adversarial nets

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

Derivation of Expanded Isospectral-Nonisospectral Integrable Hierarchies via the Column-vector Loop Algebra

引用

Acta Mathematicae Applicatae Sinica 2024年第3期40卷 778-800页

作者： hai-feng WANG yu-feng ZHANG School of Science Jimei UniversityXiamen 361021China School of Mathematics China University of Mining and TechnologyXuzhou 221116China

A scheme for generating nonisospectral integrable hierarchies is *** on the method,we deduce a nonisospectral hierarchy of soliton equations by considering a linear spectral *** follows that the corresponding expanded isospectral and nonisospectral integrable hierarchies are deduced based on a 6 dimensional complex linear space ■.By reducing these integrable hierarchies,we obtain the expanded isospectral and nonisospectral derivative nonlinear Schr?dinger *** using the trace identity,the biHamiltonian structure of these two hierarchies are also ***,some symmetries and conserved quantities of the resulting hierarchy are discussed.

关键词： expanded isospectral-nonisospectral integrable hierarchies column-vector loop algebra bi-Hamiltonian structure symmetry

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

解读国际动脉瘤性蛛网膜下腔出血试验文献及动脉瘤栓塞现状

引用

中国脑血管病杂志 2007年第8期4卷 337-338,369页

作者：鲍遇海首都医科大学宣武医院神经外科中国国际神经科学研究所北京100053

蛛网膜下腔出血的发病率约为10.5/10万人年,其中动脉瘤破裂约占80%,其病死率为51%,幸存者约有1/3重残.面对如此常见和严重的疾病,其最佳治疗方法的创建和选择无疑是重大的科学和人文问题.我们应该勇敢而科学地面对这个问题.电解可脱性... 详细信息

蛛网膜下腔出血的发病率约为10.5/10万人年,其中动脉瘤破裂约占80%,其病死率为51%,幸存者约有1/3重残.面对如此常见和严重的疾病,其最佳治疗方法的创建和选择无疑是重大的科学和人文问题.我们应该勇敢而科学地面对这个问题.电解可脱性弹簧圈(Guglielmi detachable coil,GDC)栓塞动脉瘤的技术出现后,传统的手术方法遇到了挑战.作者评价分析了国际动脉瘤性蛛网膜下腔出血试验(International Subarachnoid Aneurysm Trial,ISAT)的研究结果,对GDC栓塞动脉瘤的现状和存在的问题进行尝试性的概括.

关键词：动脉瘤性蛛网膜下腔出血栓塞动脉瘤电解可脱性弹簧圈文献试验国际解读动脉瘤破裂

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

Temperature-controlled DCP Fluorescent Probe Based on Hydrogel-immobilized Quantum Dots Composite

引用

Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 931-936页

作者：童伊琳杨坤 HAN Xuecai yu Kan bao Jiaqi Faculty Information Science and Technology Wenhua CollegeWuhan 430074China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430074China Yangtze Optical Fibre and Cable Joint Stock Limited Company Wuhan 430074China

A composite was created by incorporating the quantum dot-enhanced SiO_(2)nanoparticles within this *** on this composite,a temperature-controlled fluorescent probe for DCP was developed.A meticulous examination of this probe revealed its attributes and factors affecting its *** using temperature modulation,the probe was adept at detecting DCP concentrations ranging between 1.0×10^(-6)and 9.0×10^(-6)mol/*** a probe offers remarkable selectivity,repeatability,and robust stability,so that the detection of DCP can be carried out at different temperatures,and a fast,reliable,sensitive and low-cost intelligent detection method is realized.

关键词： temperature-controlled fluorescent probe hydrogel-immobilized quantum dots composite DCP

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

渤海固有光学量高光谱遥感反演

引用

光谱学与光谱分析 2013年第2期33卷 498-501页

作者：青松张杰包玉海内蒙古师范大学地理科学学院内蒙古呼和浩特010022 内蒙古师范大学遥感与地理信息系统重点实验室内蒙古呼和浩特010022 国家海洋局第一海洋研究所山东青岛266061

水体固有光学量是重要的海洋光学参数,是辐射传输模型最基本的输入参数,对于海洋光学遥感和水色研究具有重要意义。基于2005年渤海高光谱实测遥感反射率和总吸收系数数据,首次利用非线性最小化优化模型,反演水体总吸收系数等固有光学量... 详细信息

水体固有光学量是重要的海洋光学参数,是辐射传输模型最基本的输入参数,对于海洋光学遥感和水色研究具有重要意义。基于2005年渤海高光谱实测遥感反射率和总吸收系数数据,首次利用非线性最小化优化模型,反演水体总吸收系数等固有光学量。经过实测数据的检验,412,440,510,555,650和676nm波段总吸收系数的反演平均相对误差分别为33.8%,20.4%,27.7%,37.5%,9.5%和10.8%。模型误差源主要为模型参数的不确定性和测量误差,通过讨论发现,光谱斜率S对总吸收系数的反演影响相对较少,而光谱指数Y导致的反演误差是不可忽略的。模型适用于高光谱数据,填补渤海固有光学量的最优化反演研究的空白,并可用于高光谱遥感数据的固有光学量遥感反演研究。

关键词：固有光学量高光谱渤海反演

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：