检索结果-南通市图书馆

Spatiotemporal characteristics of cultivated land use eco-efficiency and its influencing factors in China from 2000 to 2020

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2024年第3期16卷 396-414页

作者： LI Shaoting MU Na REN Yanjun Thomas GLAUBEN College of Economics and management Northwest A&F UniversityYangling 712100China Sino-German Center for Agricultural and Food Economics Northwest A&F UniversityYangling 712100China Leibniz Institute of Agricultural Development in Transition Economies(IAMO) Halle 06120Germany

Improving cultivated land use eco-efficiency(CLUE)can effectively promote agricultural sustainability,particularly in developing countries where CLUE is generally *** study used provincial-level data from China to evaluate the spatiotemporal evolution of CLUE from 2000 to 2020 and identified the influencing factors of CLUE by using a panel Tobit *** addition,given the undesirable outputs of agricultural production,we incorporated carbon emissions and nonpoint source pollution into the global benchmark-undesirable output-super efficiency-slacks-based measure(GB-US-SBM)model,which combines global benchmark technology,undesirable output,super efficiency,and slacks-based *** results indicated that there was an upward trend in CLUE in China from 2000 to 2020,with an increase rate of 2.62%.The temporal evolution of CLUE in China could be classified into three distinct stages:a period of fluctuating decrease(2000-2007),a phase of gradual increase(2008-2014),and a period of rapid growth(2015-2020).The major grain-producing areas(MPAs)had a lower CLUE than their counterparts,namely,non-major grain-production areas(non-MPAs).The spatial agglomeration effect followed a northeast-southwest strip distribution;and the movement path of barycentre revealed a"P"shape,with Luoyang City,Henan Province,as the *** terms of influencing factors of CLUE,investment in science and technology played the most vital role in improving CLUE,while irrigation index had the most negative *** should be noted that these two influencing factors had different impacts on MPAs and ***,relevant departments should formulate policies to enhance the level of science and technology,improve irrigation condition,and promote sustainable utilization of cultivated land.

关键词： cultivated land use eco-efficiency(CLUE) slacks-based measure(SBM)model barycentre model standard deviation ellipse(SDE) panel Tobit model carbon emissions nonpoint source pollution

Using structure restoration maps to comprehensively identify potential faults and fractures in compressional structures

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2016年第3期23卷 677-684页

作者：欧成华陈伟李朝纯 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(southwest Petroleum University) Chengdu 610500China State-owned Asset management Office(southwest Petroleum University) Chengdu 610500China

Faults and fractures of multiple scales are frequently induced and generated in compressional structural system. Comprehensive identification of these potential faults and fractures that cannot be distinguished directly from seismic profile of the complex structures is still an unanswered problem. Based on the compressional structural geometry and kinematics theories as well as the structural interpretation from seismic data, a set of techniques is established for the identification of potential faults and fractures in compressional structures. Firstly, three-dimensional(3D) patterns and characteristics of the faults directly interpreted from seismic profile were illustrated by 3D structural model. Then, the unfolding index maps, the principal structural curvature maps, and tectonic stress field maps were obtained from structural restoration. Moreover, potential faults and fractures in compressional structures were quantitatively identified relying on comprehensive analysis of these three maps. Successful identification of the potential faults and fractures in Mishrif limestone formation and in Asmari dolomite formation of Buzurgan anticline in Iraq demonstrates the applicability and reliability of these techniques.

关键词： potential fault and fracture comprehensive identification structure restoration maps 3D structural modeling compressional structures

Human Resource management Theory in the Context of Economic Development Transformation from the Perspective of the Social Productive Forces

在线全文

学校读者我要写书评

暂无评论

学术界 2013年第12期 300-304页

作者： Liu Xiantao Shi Jun School of Economics and management southwest Petroleum University

This paper explores the development of the human resource management theory from the perspective of social productive forces,deeply analyzing the development of the current social productive forces and the characteristics of the socio-economic *** can be concluded that the development of the human resource management theory is closely related to the socio-economic development *** twenty first century is a knowledge-driven era,and"eco-friendly"and"low-carbon"are the basic characteristics of the socio-economic development of the era of the knowledge-driven economy,which has great influence on the subject,aim and content of human resource *** human resource management conforms to the trend of the transformation of the socio-economic *** on the management of"human",it creates an eco-friendly,low-carbon and sustainable environment for enterprises,which promotes the transformation from extensive growth to intensive growth of the macro management of enterprises.

关键词：社会经济发展人力资源管理社会生产力管理理论语境生态友好宏观管理集约型

Assessment for Production and Operation Ability of Medium and Small-sized Enterprises Based on Neural Network

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2006年第3期16卷 376-380页

作者： WANG Yu-hong XU Jun WANG Guan ZENG Qi School of Remote Sensing Information Engineering Wuhan University Wuhan Hubei 430079 China School of Economy ＆ management Henan Polytechnic University Jiaozuo Henan 454000 China School of traffic and Transportation Southwest Jiaotong University Chengdu Sichuan 610031 China

In order to improve production and operation ability of medium and small-sized enterprises, an assessment-index system of production and operation ability was proposed, and a corresponding assessment model was established based on BP neural network. The conjunction weights of the neural network were continuously modified from output layer to input layer in the process of neural network training to reduce the errors between the anticipated and actual outputs. The results from an example show that this method is reliable and feasible. The production and operation abilitv of an enterorise with assessed result of 0.833 is fairly oowerful, and that with assessed result of 0.644 is average.

关键词： medium and small-sized enterprises production and operation ability BP neural network assessment

Comparative study on consumption behaviors in private car markets between large and medium-small cities in China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2016年第2期16卷 88-95页

作者： Deqing Tan Yiqing Tang Ning Lu School of Economics and management Southwest Jiaotong University School of Arts and Communication Southwest Jiaotong University

With the economic development and the acceleration of motorization in China,the number of private cars increases rapidly in urban ***,the limit of urban resources and the contradiction between traffic supply and demand are increasingly prominent in large cities,while private car consumption has been a new "light" in medium and small ***' behaviors differ from region to *** at the above problems,we formulate structural equation modeling and carry out empirical *** this paper,a comparative study about the main influential factors that affect the consumption of private cars in large and small cities in China is made,and it is hoped that some guidance for policy recommendations can be obtained.

关键词： Private car consumer behavior structural equation modeling

Structural geometrical analysis and simulation of decollement growth folds in piedmont Fauqi Anticline of Zagros Mountains, Iraq

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第9期59卷 1885-1898页

作者： OU ChengHua CHEN Wei LI ChaoChun ZHOU WenJiang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University State-owned Asset management Office Southwest Petroleum University Zhundong Oil Production Plant Xinjiang Oilfield Company

This study carried out detailed structural analyses of the plane structural deformation pattern and sectional structural deformation styles of the Fauqi Anticline by the 3D seismic section with full cover collection, and carried out the kinematical simulation of the Fauqi anticlinal deep decollement coupling shallow growth folds and faults based on the fault decollement fold model and the forward balanced geological section technique. The study subsequently evaluated the differentiated petroleum enrichment mechanism of the Fauqi Anticline by utilizing the results of the structural analysis and combining the spatial-temporal relationship analysis of the source, the reservoir, and the caprock. The results showed that the differentiated plane structural deformation pattern and hierarchical sectional structural deformation style were developed by the superposed coupling of deep decollement, syntectonic sedimentation of shallow growth strata, and the compression of the south-west horizontal tectonic stress from the Zagros Mountains. It was found that the differentiated structural deformation caused the differentiated enrichment of petroleum in the Fauqi Anticline. It was also found that the horizontal slip distance of the Fauqi Anticlinal Folds reached around 3.5 km by the simulation of deep decollement coupling the movement of the shallow growth folds and the faults.

关键词： Fauqi Anticline Decollement Growth fold Geometrical analysis of structures Kinematical simulation Petroleum enrichment Zagros Mountains

Comprehensive evaluation and spatial-temporal evolution characteristics of urban resilience in Chengdu-Chongqing Economic Circle

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2024年第1期22卷 58-67页

作者： Xin Li Shuyi Zhang Rongxi Ren Yafei Wang School of Economics and management Chongqing Normal UniversityChongqing 401331China College of Marxism Taiyuan Normal UniversityTaiyuan 030619China Family Institute Northwestern UniversityChicago 60208USA

To clarify the connotations and extensions of urban resilience,this study focuses on the Chengdu-Chongqing Economic Circle with 16 cities as research subjects.A comprehensive evaluation index system was constructed to measure the resilience of each city from 2003 to *** spatial-temporal evolution characteristics were analyzed using Kernel density estimation,standard deviation ellipse,and spatial Markov chain analysis,and the spatial Tobit model was introduced to discover the influencing *** results indicate the following:①Urban resilience in the Chengdu-Chongqing Economic Circle displays an upward trend,with the center of gravity moving to the southwest,and the polarization phenomenon intensifying.②The urban resilience level in a region has certain spatial and geographical dependence,while the probability of urban resilience transfer differs in adjacent cities with different resilience levels.③Urban centrality,economic scale,openness level,and financial development promote urban resilience,whereas government scale significantly inhibits ***,this paper proposes countermeasures and suggestions to improve the urban resilience of the Chengdu-Chongqing Economic Circle.

关键词： Chengdu-chongqing Economic Circle Urban resilience Spatial-temporal evolution Driving factor

Two-phase TOPSIS of uncertain multi-attribute group decision-making

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第3期21卷 423-430页

作者： Wenkun Zhou Wenchun Jiang School of management Shanghai University Shanghai 200444 R R. China School of Economics and management Southwest Jiaotong University Chengdu 610031 P. R. China

To solve the uncertain multi-attribute group decision-making of unknown attribute weights,three optimal models are built to decide the corresponding ideal solution weights,standard deviation weights and mean deviation *** comprehensive attribute weights are gotten through the product of the above three kinds of *** each decision maker＇s weighted decision matrices are also received by using the integrated attribute *** closeness degrees are also gotten by use of technique for order preference by similarity to ideal solution（TOPSIS） through dealing with the weighted decision *** the same time the group decision matrix and weighted group decision matrix are gotten by using each decision-maker＇s closeness degree to every *** the vertical TOPSIS method is used to calculate the closeness degree of each *** these projects can be ranked according to their values of the closeness *** process of the method is also given step by ***,a numerical example demonstrates the feasibility and effectiveness of the approach.

关键词： multi-attribute decision-making uncertain numbers TOPSIS weights the closeness degree.

A BiGRU joint optimized attention network for recognition of drilling conditions

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第6期20卷 3624-3637页

作者： Ying Qiao Hong-Min Xu Wen-Jun Zhou Bo Peng Bin Hu Xiao Guo National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina School of Computer Science Southwest Petroleum UniversityChengdu610500SichuanChina Information management Center of Sinopec southwest Oil and Gas Branch Chengdu610500SichuanChina

The identification and recording of drilling conditions are crucial for ensuring drilling safety and efficiency. However, the traditional approach of relying on the subjective determination of drilling masters based on experience formulas is slow and not suitable for rapid drilling. In this paper, we propose a drilling condition classification method based on a neural network model. The model uses an improved Bidirectional Gated Recurrent Unit (BiGRU) combined with an attention mechanism to accurately classify seven common drilling conditions simultaneously, achieving an average accuracy of 91.63%. The model also demonstrates excellent generalization ability, real-time performance, and accuracy, making it suitable for actual production. Additionally, the model has excellent expandability, which enhances its potential for further application.

关键词： Drilling condition classification BiGRU Machine learning Attention mechanism