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1.
汽车平顺性评价体系   总被引:6,自引:2,他引:6  
为了对汽车平顺性进行评价以及对悬架参数进行优化选择,根据汽车平顺性的3个评价指标,充分利用主观评价法和客观评价法各自的优点,建立了一个汽车平顺性评价体系.根据各评价指标的重要性,利用层次分析法,确定它们的主观权重;根据各评价指标的性能统计数据,利用熵值法,确定它们的客观权重;综合主观权重与客观权重,确定各评价指标的最终权重;根据各评价指标的最终权重与性能统计数据计算汽车平顺性的评价值.该评价体系以逐次淘汰的方式求优,通过最小的评价值与最优的汽车平顺性相对应的方式评选出最优的悬架参数方案,该体系便于计算机编程使用.  相似文献   

2.
以长江流域的水质为研究对象,应用熵权法对其进行量化评价,考虑多个样本间的联系,根据各项指标的差异程度,确定各指标的权重,可削弱异常值的影响,使评价结果更合理、准确。文章通过对长江近两年多的水质情况分析,根据各污染因子对水质的影响差异确定其权重,运用矩阵分析的方法建立了水质模糊综合评价模型,从而进行了水质多指标的综合评价。  相似文献   

3.
AHP法在江西脆弱生态环境评价指标体系中的应用   总被引:2,自引:0,他引:2  
根据区域脆弱生态环境评价指标体系建立的原则,结合本区脆弱性的特点,建立了江西省脆弱生态环境评价指标体系;采用AHP法计算各指标的权重,得到了4个层次的层次单排序。在此基础上,确定了各层次各因子相对的权重,用于评价江西省脆弱生态环境的脆弱程度。结果表明,江西省脆弱生态环境评价指标体系中,目标要素B以人为干扰脆弱(B2)为主,占73%;指标层(D)中20个指标相对应总目标A的权重值排序结果显示,森林覆盖率所占的权重最大,达0.2044,水土流失强度的权重次之,为0.1825,二者占20个指标的比例达39%之多,平均各占19.5%;其他18项指标之和只占61%,平均各占约39%,且单项权重值均小于0.1,足以反映影响江西省脆弱生态环境程度的主导因子是人为干扰脆弱为主,即森林覆盖率和水土流失强度。  相似文献   

4.
住宅小区房地产投资经济风险的评估   总被引:1,自引:0,他引:1  
文章分析了住宅小区房地产投资经济风险的多层次影响因素,在单指标因子的基础上运用层次分析法建立总目标影响结构层次模型,确定了各指标归一化权重.并运用模糊综合评价模型将各评价单元加以归并,获得目标的评价总分值.文章将风险评价度予以量化处理,并通过实例分析对该理论作了实际的操作,为房地产投资风险研究方法的进一步改进提供了可靠的依据.  相似文献   

5.
基于因子分析定权的水质评价模型   总被引:6,自引:0,他引:6  
在因子分析法的基础上,提出基于因子分析定权的水质评价模型.该模型由因子得分系数和方差贡献率确定指标权重,然后以指标权重与各水样相应指标的标准化值进行加权平均得到水质评价的综合指标值,进而对评价样本进行排序和分级.结合实例应用并通过与其它几种水质评价方法的比较,进一步验证了该模型的合理、简便和实用.  相似文献   

6.
根据风电建设项目自身的特点运用模糊数学的理论和方法,建立风电建设项目社会评价的模糊多层次综合评价模型,建立风电建设项目社会评价的指标体系。运用AHP的基本思想,创造性的使其与模糊多层次综合评价模型中指标分层思想相结合,对指标分层,确定各指标权重。最后,运用该模型对某风电建设项目进行社会评价,验证其实用性,为项目的投资决策和资本运作提供科学的依据。  相似文献   

7.
针对服装行业中所选用的模特评价标准缺乏准确性和科学性,力求为构建一套具有较强科学性的服装模特体型评价标准进行基础的定量分析,为正确制定号型规格标准、建立服装原型等提供理论参考.对来自20所高校服装表演专业的150名学生的15项数据指标利用非接触式人体测量仪进行测量,进而随机提取55名女大学生模特形体数据样本进行分析处理.首先,用SPSS软件对数据进行因子分析处理提取出三个主成分因子;其次,对三个主成分因子进行权重分析确定各形体指标的权重系数.结果表明:身高、胸围、腰围、臀围、体重等指标是最重要的模特体型因子.根据权重系数的大小构建出科学简便的模特体型评价得分标准.  相似文献   

8.
从审计实践的角度,建立了高校领导干部经济责任审计评价指标体系。建立的递阶层次结构共分为4层,从整体上对审计对象经济责任的履行情况和业绩进行综合分析。专家小组根据构建的评价指标体系,运用两两比较法,逐层分析指标之间相对重要性,综合其结果,得出判断矩阵,通过应用层次分析法及MATLAB软件,探讨了在确定高校领导干部经济责任审计评价指标权重中的一般程序,计算出各指标对总目标的权重值,相对准确地反映出评价对象的客观情况,不仅使审计评价结果更加直观化、数量化,而且还实现了高校领导干部经济责任审计的科学评价与判断。  相似文献   

9.
ISM规则国内化   总被引:1,自引:0,他引:1  
对ISM规则国内化的可行性进行了研究,根据对国内航运公司及其船舶的大量调查,采用模糊推理理论和方法得到了合理的结果,在具体推理过程中,利用系统工程主成分分析确定了模糊推理所采用的指标体系;采用聚类分析方法确定了各因素的评从权重值;采用模糊推理理论建立了评价模,研究了得到的结果为ISM规则国内化提供了重要参考。  相似文献   

10.
因子分析在大学综合素质评价中的应用   总被引:3,自引:0,他引:3  
文章用因子分析法分析了某班一学年的考试成绩和社会实践情况.从信息量等角度,确定综合素质评价体系中各指标的权重,根据得到的综合评价得分,对大学生综合素质进行排序、划分等级.此方法克服了人为主观因素及指标间相关性的影响,因而更为客观准确.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

13.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

14.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

15.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

16.
本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。  相似文献   

17.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

18.
19.
The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to  相似文献   

20.
Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with  相似文献   

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