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PHASE EXTENSION AND STRUCTURE ANALYSIS BY THE MAXIMUM ENTROPY METHOD 被引量:1
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作者 G.B.Hu and Q.B.Yang (Department of Physics, Xiangtan University, Xiangtan 411105, China)(Beijing Laboratory of Electron Microscopy, Center for Condensed Matter Physics, The Chinese Academy of Sciences, P. O. Box 2724, Beijing 100080, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1998年第4期241-254,共14页
Excellent results are obtained in structure analysis with jew phases of structure factors by the maximum-entropy method (MEM) for CaGaN PbCO3 and ReBe22 single crystals. The computation time and memory space are minim... Excellent results are obtained in structure analysis with jew phases of structure factors by the maximum-entropy method (MEM) for CaGaN PbCO3 and ReBe22 single crystals. The computation time and memory space are minimized by symmetry operations so that structure analysis by the MEM can be carried out with a personal computer. 展开更多
关键词 maximum entropy method structure analysis phase extension symmetry
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Engineering Geological Zoning of Soft-Soil Foundation Based on Combination Weighting and Extension Methods 被引量:1
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作者 孙明乾 王清 +4 位作者 陈剑平 李严 宋盛渊 鲍硕超 阮云凯 《Journal of Donghua University(English Edition)》 EI CAS 2016年第3期453-461,共9页
Different criteria and factors are used in different methods of soft soil foundation settlement calculation and engineering geological zoning.The methods used are not universally suitable for complex geological enviro... Different criteria and factors are used in different methods of soft soil foundation settlement calculation and engineering geological zoning.The methods used are not universally suitable for complex geological environments.The post-construction settlement of soft soil foundations are especially large and difficult to calculate.In addition,there are many deficiencies in the current methods used for engineering geological zoning.Focusing on the need of establishing engineering geological zoning for areas with soft soil foundations in the Tianjin Marine Economic Area,combination weighting and extension methods were introduced.An evaluation model for the settlement of soft soil foundations was established using multiple factors and large amounts of data.This evaluation model is accurate and objective for delineating engineering geological zoning.These methods eliminate deficiencies by considering both objective and subjective factors,and help obtain an objective and accurate result. 展开更多
关键词 soft soil foundation engineering geological zoning combination weighting method extension method
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The Extension Methods and Fecision-making Analysis on the Planting Dtructure of Dlope Garmland in Northern Shaanxi
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作者 李洋 杨茂盛 Mao-sheng 《Agricultural Science & Technology》 CAS 2010年第5期178-181,共4页
Based on the resent research about the planting structure of slope farmland in northern Shaanxi,in order to increase the native's income,we use the theory of the extension methods to analyze the planting structure... Based on the resent research about the planting structure of slope farmland in northern Shaanxi,in order to increase the native's income,we use the theory of the extension methods to analyze the planting structure of slope farmland,so that we can get the extensive strategy,and put them into use for planting of slope farmland to make the native's income higher. 展开更多
关键词 Region in northern Shaanxi Slope farmland The extension methods and Decision-making
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THE ACCELERATED SEARCH-EXTENSION METHOD FOR COMPUTING MULTIPLE SOLUTIONS OF SEMILINEAR PDEs 被引量:2
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作者 刘跃武 谢资清 陈传淼 《Acta Mathematica Scientia》 SCIE CSCD 2009年第4期803-816,共14页
In this paper, we propose an accelerated search-extension method (ASEM) based on the interpolated coefficient finite element method, the search-extension method (SEM) and the two-grid method to obtain the multiple... In this paper, we propose an accelerated search-extension method (ASEM) based on the interpolated coefficient finite element method, the search-extension method (SEM) and the two-grid method to obtain the multiple solutions for semilinear elliptic equations. This strategy is not only successfully implemented to obtain multiple solutions for a class of semilinear elliptic boundary value problems, but also reduces the expensive computation greatly. The numerical results in I-D and 2-D cases will show the efficiency of our approach. 展开更多
关键词 semilinear PDEs multiple solutions accelerated search-extension method (ASEM) two-grid method
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On Relations between the General Recurrence Formula of the Extension of Murase-Newton’s Method (the Extension of Tsuchikura*-Horiguchi’s Method) and Horner’s Method
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作者 Shunji Horiguchi 《Applied Mathematics》 2014年第4期777-783,共7页
In 1673, Yoshimasu Murase made a cubic equation to obtain the thickness of a hearth. He introduced two kinds of recurrence formulas of square and the deformation (Ref.[1]). We find that the three formulas lead to the ... In 1673, Yoshimasu Murase made a cubic equation to obtain the thickness of a hearth. He introduced two kinds of recurrence formulas of square and the deformation (Ref.[1]). We find that the three formulas lead to the extension of Newton-Raphson’s method and Horner’s method at the same time. This shows originality of Japanese native mathematics (Wasan) in the Edo era (1600- 1867). Suzuki (Ref.[2]) estimates Murase to be a rare mathematician in not only the history of Wasan but also the history of mathematics in the world. Section 1 introduces Murase’s three solutions of the cubic equation of the hearth. Section 2 explains the Horner’s method. We give the generalization of three formulas and the relation between these formulas and Horner’s method. Section 3 gives definitions of Murase-Newton’s method (Tsuchikura-Horiguchi’s method), general recurrence formula of Murase-Newton’s method (Tsuchikura-Horiguchi’s method), and general recurrence formula of the extension of Murase-Newton’s method (the extension of Tsuchikura-Horiguchi’s method) concerning n-degree polynomial equation. Section 4 is contents of the title of this paper. 展开更多
关键词 RECURRENCE FORMULA Newton-Raphson’s METHOD (Newton’s Method) EXTENSIONS of Murase-Newton’s METHOD Horner’s METHOD
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THE APPLICATION AND EXTENSION OF SACHS METHOD
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作者 宋顺成 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1989年第12期1163-1169,共7页
In this paper,we present the simplification of Sachs formulas for the measurement and calculation of the residual stresses of the cylinder only with the plane stresses. Furthermore, we present the method for the measu... In this paper,we present the simplification of Sachs formulas for the measurement and calculation of the residual stresses of the cylinder only with the plane stresses. Furthermore, we present the method for the measurement and calculation of the residual stresses of the cylinder not only with the finite length but with the longitudinal stress. These can be applied to the investigation on the residual stresses of the autofretted gun tube. 展开更多
关键词 THE APPLICATION AND EXTENSION OF SACHS METHOD LENGTH
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Comparison of Classical Method, Extension Principle and α-Cuts and Interval Arithmetic Method in Solving System of Fuzzy Linear Equations
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作者 Sahidul Islam Md. Saiduzzaman +1 位作者 Md. Shafiqul Islam Abeda Sultana 《American Journal of Computational Mathematics》 2019年第1期1-24,共24页
The system of linear equations plays a vital role in real life problems such as optimization, economics, and engineering. The parameters of the system of linear equations are modeled by taking the experimental or obse... The system of linear equations plays a vital role in real life problems such as optimization, economics, and engineering. The parameters of the system of linear equations are modeled by taking the experimental or observation data. So the parameters of the system actually contain uncertainty rather than the crisp one. The uncertainties may be considered in term of interval or fuzzy numbers. In this paper, a detailed study of three solution techniques namely Classical Method, Extension Principle method and α-cuts and interval Arithmetic Method to solve the system of fuzzy linear equations has been done. Appropriate applications are given to illustrate each technique. Then we discuss the comparison of the different methods numerically and graphically. 展开更多
关键词 Fuzzy Set CLASSICAL Solution Extension Principle α-Cut and INTERVAL ARITHMETIC METHOD
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EXTENSIONS OF SOME INEQUALITIES 被引量:2
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作者 Chen Daoqiof Math., Zhejiang Univ., Hangzhou, 310027. 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2001年第3期241-243,共3页
By using a simple analytic method the following inequalities are proved:(b x+y -a x+y )/(b x-a x)≥[(x+y)/x][(a+b)/2] y, for 0<a<b,x≥1,y>0,x+y≥2; (b x+y -a x+y )/(b x-a x)<[(x... By using a simple analytic method the following inequalities are proved:(b x+y -a x+y )/(b x-a x)≥[(x+y)/x][(a+b)/2] y, for 0<a<b,x≥1,y>0,x+y≥2; (b x+y -a x+y )/(b x-a x)<[(x+y)/x][(a+b)/2] y, for 0<a<b,0<x<1,y>0,x+y≤2. These inequalities are the extensions of inequalities of Qi Feng, Xu Senlin and Zheng Lin. And a conjection of Qi Feng is proved not true. 展开更多
关键词 Analytic method INEQUALITY EXTENSION conjection.
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Research on Extension Evaluation of Rural Road Maintenance Quality Based on Game Theory 被引量:2
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作者 Gongliang Zhang Shou Chen Ping Xiao 《Applied Mathematics》 2020年第7期670-677,共8页
The importance of rural highway maintenance is self-evident, and it is also a basic work of the highway operation department. Selecting an appropriate evaluation method can timely and accurately find the pavement dise... The importance of rural highway maintenance is self-evident, and it is also a basic work of the highway operation department. Selecting an appropriate evaluation method can timely and accurately find the pavement diseases, and improve the timeliness of pavement repair. To improve the accuracy of pavement quality comprehensive evaluation, based on the game theory, the improved extension evaluation method was combined with subjective and objective weight determination methods in this paper, to propose a comprehensive weight determination method with a good operability.<span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">The results</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">show that the improved extension evaluation method provid</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">es</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> a feasible scheme for rural highway maintenance quality evaluation</span></span></span> 展开更多
关键词 Rural Highway Extension Evaluation Comprehensive Weighting Method Game Theory
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Enhancement of MAD/MIR phasing at low resolution and a new procedure for automatic phase extension
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作者 Pu Han Yuan-Xin Gu +1 位作者 Wei Ding Hai-Fu Fan 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期389-395,共7页
To achieve de novo protein structure determination of challenging cases, multi-wavelength anomalous diffraction(MAD) and multiple isomorphous replacement(MIR) phasing can be powerful tools to obtain low-resolution ini... To achieve de novo protein structure determination of challenging cases, multi-wavelength anomalous diffraction(MAD) and multiple isomorphous replacement(MIR) phasing can be powerful tools to obtain low-resolution initial phases from heavy-atom derivative datasets, then phase extension is needed against high-resolution data to obtain accurate structures.In this context, we propose a direct-methods procedure here that could improve the initial low-resolution MAD/MIR phase quality.And accordingly, an automated process for extending initial phases to high resolution is also described.These two procedures are both implanted in the newly released IPCAS pipeline.Three cases are used to perform the test, including one set of 4.17 ? MAD data from a membrane protein and two sets of MAD/MIR data with derivatives truncated down to 6.80 ? and 6.90 ?, respectively.All the results have shown that the initial phases generated from the direct-methods procedure are better than that from the conventional MAD/MIR methods.The automated phase extensions for the latter two cases starting from 6.80 ? to 3.00 ? and 6.90 ? to 2.80 ? are proved to be successful, leading to complete models.This may provide convenient and reliable tools for phase improvement and phase extension in difficult low-resolution tasks. 展开更多
关键词 direct methods MULTI-WAVELENGTH anomalous diffraction(MAD)/multiple isomorphous replacement(MIR) PHASING PHASE EXTENSION low-resolution
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Study on Extension Strategy-Tactics-Planning 被引量:2
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作者 YangChunyan ZhangYongjun ZhuDongmei 《工程科学(英文版)》 2004年第2期38-43,共6页
Extension strategy tactics planning (ESTP), based upon the science of Extenics, is established for the purpose of solving contradictory problems. In this paper, the fundamental thoughts, theories and methods of ESTP a... Extension strategy tactics planning (ESTP), based upon the science of Extenics, is established for the purpose of solving contradictory problems. In this paper, the fundamental thoughts, theories and methods of ESTP are introduced concisely. The highlights of ESTP are that the techniques, used in the case of tackling such problems as how to generate the ideas of strategy tactics planning, how to completely analyze the resources, how to exploit extension resources, how to transfer the incompatible into the compati ble, and how to transfer the opposite into the co existent, are developed in a formalized way. And regarding the practices of ESTP, the applications of ESTP in resource integration, project, market development, and the prevention and handling crises are presented. 展开更多
关键词 扩展战略战术规划 矛盾问题 理想发生 扩展源 和平共处原则 共轭分析 全球问题 危机处理
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基于TRIZ与可拓创新方法的机械产品概念设计方法研究 被引量:2
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作者 熊宗慧 曹东升 +1 位作者 胡平平 何志琪 《机床与液压》 北大核心 2024年第3期86-92,共7页
提出一种机械产品概念设计的创新方法,对概念设计阶段进行细分,将发明问题解决理论(TRIZ)与可拓创新方法的优势相结合,建立了基于两者的概念设计过程模型。通过建立用户需求基元模型与共轭分析法,确定产品的需求与功能之间的关联性,构... 提出一种机械产品概念设计的创新方法,对概念设计阶段进行细分,将发明问题解决理论(TRIZ)与可拓创新方法的优势相结合,建立了基于两者的概念设计过程模型。通过建立用户需求基元模型与共轭分析法,确定产品的需求与功能之间的关联性,构建产品功能分解树,得到根源冲突;然后运用TRIZ工具集提取工程参数查询对应的原理解,通过可拓变换生成多种概念方案;最后利用优度评价法,实现对概念方案的量化评价与优选。以小型管道清淤机器人为例进行系统的创新设计,验证了该方法实用性和有效性。 展开更多
关键词 创新设计 TRIZ 可拓学 清淤机器人
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盾构施工诱发临近桥梁安全风险评价 被引量:1
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作者 樊燕燕 王瑞 李子奇 《铁道科学与工程学报》 EI CAS CSCD 北大核心 2024年第1期375-385,共11页
针对地铁盾构施工诱发临近桥梁安全风险评估结果不完善、存在失真等问题,提出一种基于变权可拓云模型的盾构施工诱发临近桥梁安全风险评价方法。首先,结合以往研究基础和实际工程经验,建立盾构施工诱发临近桥梁安全事故机理模型,进而确... 针对地铁盾构施工诱发临近桥梁安全风险评估结果不完善、存在失真等问题,提出一种基于变权可拓云模型的盾构施工诱发临近桥梁安全风险评价方法。首先,结合以往研究基础和实际工程经验,建立盾构施工诱发临近桥梁安全事故机理模型,进而确定孕险环境、致险因子和承险体3个1级指标,其中包括有岩土层物理性能参数、隧道工程条件、盾构施工条件、盾构施工参数、施工管理风险、桥梁现状及桥梁自身条件7个2级指标和内摩擦角、弹性模量等27个3级指标为依据建立盾构施工诱发临近桥梁安全风险评价指标体系。其次,通过改进CRITIC客观赋权法获取评价指标权重,并采用变权可拓云模型构建盾构施工诱发临近桥梁安全风险评价模型,其中引入变权理论得到使评价结果更加科学合理的变化权重。最后,对某市轨道交通1号线一期工程Ⅱ标段沿线桥梁进行实例分析。研究结果表明,4座盾构施工临近桥梁安全风险等级分别为Ⅲ、Ⅱ、Ⅱ、Ⅰ级。其中,该施工场地各项土体指标、隧道覆跨比、隧道埋深、隧道直径及桥桩与隧道的相对位置等指标风险较大,即该段隧道盾构施工时对于桥梁自身情况及其施工场地环境需要重点监测,并严格做好周围土体加固等各项技术措施。研究结果可为盾构施工诱发临近桥梁安全风险防控提供科学有效的参考依据。 展开更多
关键词 盾构施工 临近桥梁 改进CRITIC客观赋权法 变权可拓云模型 风险评价
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基于可拓云理论的化工建筑施工安全风险评估
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作者 陈飞 欧红香 《工业安全与环保》 2024年第9期13-17,共5页
引入可拓云理论构建了化工建筑施工安全风险评估模型,在该模型内,最优最劣法和CRITIC法分别用于计算主客观权重值。研究应用博弈论确定组合赋权权重值,以消除主客观权重法之间的误差。最后,计算可拓云模型内模糊等级特征期望值Erq、模... 引入可拓云理论构建了化工建筑施工安全风险评估模型,在该模型内,最优最劣法和CRITIC法分别用于计算主客观权重值。研究应用博弈论确定组合赋权权重值,以消除主客观权重法之间的误差。最后,计算可拓云模型内模糊等级特征期望值Erq、模糊等级特征熵值Ers、综合评判向量B和置信度因子g等参数。结果表明:该化工项目施工安全综合风险等级为中等,模糊等级特征期望值Erq为2.952 8,模糊等级特征熵值Ers为0.016 5,置信度因子g为0.005 6,符合一致性要求,结果可信。研究结果为现场安全管理人员提供参考。 展开更多
关键词 可拓云理论 最优最劣法 CRITIC法 组合赋权 风险评估
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航空公司安全韧性评价模型
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作者 王永刚 王海玥 方琛亮 《安全与环境学报》 CAS CSCD 北大核心 2024年第1期63-71,共9页
为科学量化航空公司应对风险冲击与扰动,保持安全运行水平稳定的能力,将“安全韧性”概念引入航空公司安全管理,构建航空公司安全韧性评价模型。基于交通运输领域对韧性内涵的理解,提出航空公司安全韧性概念曲线,明确了航空公司安全韧... 为科学量化航空公司应对风险冲击与扰动,保持安全运行水平稳定的能力,将“安全韧性”概念引入航空公司安全管理,构建航空公司安全韧性评价模型。基于交通运输领域对韧性内涵的理解,提出航空公司安全韧性概念曲线,明确了航空公司安全韧性包括风险应对能力和安全运行恢复能力两方面。运用文献计量法和专家访谈法建立了航空公司安全韧性评价指标体系。运用序关系分析法和物元可拓理论构建了航空公司安全韧性评价模型。运用该模型对A航空公司进行评价,结果表明,A航空公司安全韧性等级为五级,处于优秀水平,与公司现阶段实际情况基本相符。 展开更多
关键词 安全工程 韧性 航空公司 序关系分析法 物元可拓理论
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首都国际机场陆侧交通运行状态的评价研究
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作者 褚衍昌 张慧娟 艾艳博 《重庆交通大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第8期78-85,95,共9页
随着民航客流量的快速增长,机场陆侧交通运行状态已成为制约机场功能有效发挥的瓶颈。为了更高效合理地评估机场陆侧交通运行状态,在考虑评价过程中不确定性、主观随意性和客观失真性对评价结果影响的前提下,提出一种基于组合权重和可... 随着民航客流量的快速增长,机场陆侧交通运行状态已成为制约机场功能有效发挥的瓶颈。为了更高效合理地评估机场陆侧交通运行状态,在考虑评价过程中不确定性、主观随意性和客观失真性对评价结果影响的前提下,提出一种基于组合权重和可拓云模型的新评价方法;以首都国际机场四纬路的实地调研交通数据为例,对机场陆侧交通运行状态进行了综合评价并确定其综合评价等级。研究结果表明:新方法在机场陆侧交通运行状态评价中具有较好的可行性和适用性;评价结果在一定程度上能反映出机场陆侧交通的实际运行状态。 展开更多
关键词 交通工程 机场陆侧交通 可拓云模型 组合赋权法 运行状态
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基于物元可拓模型的工商管理类专业人才胜任力评价研究
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作者 邹浩 杨文楦 《高教学刊》 2024年第12期162-165,共4页
结合工商管理类专业人才胜任力的特点,首先从个人能力、通用能力、专业能力和发展能力四个方面建立工商管理类专业人才胜任力评价指标体系,并运用AHP-熵值法确定各指标的组合权重,接着利用物元可拓理论构建工商管理类专业人才胜任力评... 结合工商管理类专业人才胜任力的特点,首先从个人能力、通用能力、专业能力和发展能力四个方面建立工商管理类专业人才胜任力评价指标体系,并运用AHP-熵值法确定各指标的组合权重,接着利用物元可拓理论构建工商管理类专业人才胜任力评价模型,最后对湖南财政经济学院工商管理类专业人才胜任力进行综合评价。 展开更多
关键词 工商管理类专业 人才胜任力 物元可拓法 熵值法 评价
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面向农机产品服务供应链采购模式匹配评价
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作者 熊宗慧 何志琪 +1 位作者 胡平平 曹东升 《中国农机化学报》 北大核心 2024年第8期308-316,共9页
随着制造业数字化转型和农机产品服务供应链的应用,突显出农机制造企业产品零部件采购模式,在选择匹配过程中存在主观性与模糊性的问题,提出一种基于物元可拓优度结合可拓层次分析法和CRITIC综合赋权法的采购模式匹配评价方法。从农机... 随着制造业数字化转型和农机产品服务供应链的应用,突显出农机制造企业产品零部件采购模式,在选择匹配过程中存在主观性与模糊性的问题,提出一种基于物元可拓优度结合可拓层次分析法和CRITIC综合赋权法的采购模式匹配评价方法。从农机制造企业产品自身特征和产品服务供应链影响因素为切入点,构建产品服务供应链视角下的农机制造装备采购模式匹配评价体系,并通过关联函数计算,得到采购模式综合优度排序和单项指标的关联度对比,输出最优采购匹配模式和模式识别度。结果表明,最优采购模式匹配度为0.118,所对应的模式可以作为产供销阶段的核心采购模式。实例计算表明,建立的评价模型与企业匹配度很高,该方法将定性预测和定量决策结合起来,可以为农机制造企业的产品采购模式提供系统科学的匹配工具。 展开更多
关键词 农机机械 产品服务供应链 物元可拓方法 采购模式匹配 指标体系
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城市地下商场安全文化建设水平评价方法
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作者 谢尊贤 张傲雪 +1 位作者 张志远 郝聪 《地下空间与工程学报》 CSCD 北大核心 2024年第2期351-358,共8页
为提升地下商场安全文化建设水平,预防安全事故发生,保障运营安全,从安全文化4个层次全面分析了地下商场安全文化建设因素,首次系统地构建了由安全观念文化等4个一级指标和安全战略意识等28个二级指标构成的地下商场安全文化建设水平评... 为提升地下商场安全文化建设水平,预防安全事故发生,保障运营安全,从安全文化4个层次全面分析了地下商场安全文化建设因素,首次系统地构建了由安全观念文化等4个一级指标和安全战略意识等28个二级指标构成的地下商场安全文化建设水平评价指标体系;首次将优化层次分析法(OAHP)和信息熵权法的组合权重计算法与物元可拓模型有机融合构建了地下商场安全文化建设水平评价模型;应用该评价体系对西安某大型地下商场进行了实证研究,得出其安全文化建设水平较高,等级为Ⅱ级,属于自主管理阶段,评价结果与实际情况相符,通过关联分析发现了其安全文化建设的不足,提出了针对性提升措施。研究表明:该评价体系适用于地下商场安全文化建设水平评价。本文成果为地下商场安全文化建设水平评价提供了一种方法。 展开更多
关键词 安全文化 地下商场 优化层次分析法 熵权法 物元可拓模型
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“大思政课”背景下“生物分离工程”课程思政教学实践探索
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作者 王晓军 洪一楠 +3 位作者 潘虹 何艳慧 刘啸尘 穆瑞花 《广东化工》 CAS 2024年第3期183-185,共3页
课程思政是深刻体现习近平总书记大思政课理念的育人改革措施。为了适应新形势下对人才培养的育人要求,“生物分离工程”课程团队通过学习不断提高自身思政理论水平,根据课程内容确定课程思政目标,在课程教学过程中从思政元素的挖掘和... 课程思政是深刻体现习近平总书记大思政课理念的育人改革措施。为了适应新形势下对人才培养的育人要求,“生物分离工程”课程团队通过学习不断提高自身思政理论水平,根据课程内容确定课程思政目标,在课程教学过程中从思政元素的挖掘和融入、课程教学方法和手段、考核方式等多方面探索思政教育的融合实践。从考核结果可以看出价值引领对知识传授、能力培养起到了正向的作用,提高了课程目标的达成度,达到了良好的教学效果。 展开更多
关键词 大思政课 生物分离工程 课程思政 融合实践 教学方法 教学效果
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