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In order to overcome the technological difficulties encountered in the course of insulation fault diagnosis on the base of dissolved gases analysis, several kinds of mathematic models and actualized methods are brought forward to improve the reliability and veracity of fault diagnosis of transformers. The research works are shown mainly as followings:1 A modified fuzzy multi-criteria method is brought forward for insulation fault diagnosis of transformer. Furthermore, a new method for insulation fault diagnosis is proposed on the base of fuzzy multi-criteria together with rule reasoning. With fuzzy diagnosis in the method, fault reasons are filtrated and then the reasons in low probability are prohibited, Moreover, the left reasons are testified by using rule reasoning and then final concludes are drawn in much less misjudge probability and better results.2 On the base of geometry characteristics of C- partition to sample set of DGA data of transformer, a method is put forward to compute effective radius of neighbor field of a sample, number of clusters and values of initial centers. Moreover, the fuzzy C- means cluster model with adaptive weight is brought forward in the first time and then the fault classifier is designed for insulation fault diagnosis of transformer.3 According to the weakness of the degree of gray of gray incidence, a new formula to compute DGI is put forward and then incidence order criterion is ascertained. Moreover, a new DGI model for fault diagnosis is proposed according to the further analysis to relationship between fault reason and content of oil dissolved gases of transformer.

为解决在应用油中溶解气体分析方法(Dissolved Gases Analysis,简称DGA)诊断变压器内部绝缘故障时所遇到的主要技术难题,论文提出了用于提高变压器故障诊断准确性和可靠性的数学模型及实现方法,主要研究工作如下:1)提出了一种改进的变压器绝缘故障诊断模糊综合评判方法;进一步提出了将模糊综合诊断与规则推理相结合进行绝缘故障诊断的方法,该方法采用模糊推理对故障原因进行"过滤",滤掉可能性极小的原因,然后进一步利用规则推理验证剩下的可能原因,得出最终结论,大大减少了误判比率,获得了较好的效果。2)根据以变压器DGA数据为特征量的样本空间的c-划分几何特性出发,提出了一种求取样本有效邻域半径和聚类数及聚类中心初值的方法,在此基础上,首次提出了一种自适应加权的变压器绝缘故障诊断的模糊c-均值聚类模型,并设计出故障分类器。3)针对常用灰色关联度的不足,提出了一新的灰色关联度计算公式及确定关联序的准则;并在此基础上,通过深入分析变压器发生绝缘故障时的原因与油中溶解特征气体含量的关系,建立了一种新的故障诊断灰色关联模型;通过实例分析证明,该方法能有效地诊断出变压器绝缘故障及故障部位,大大提高了诊断的准确性。

In specialty evaluaion system of the special levels of teachers,it is impossible to get the real data by using main component analysisonly since the weight error of each index is varied.

由于评估中各项指标的权重差距很大,单纯地用主成分分析法无法得出符合实际的评价结果,本文提出了一种新的指标综合值评估法,将主成分分析法与层次分析法进行了综合运用。

September 6 to October 16 of the comprehensive survey, the research team took 41 days, more than 7300 km trip, the use of global satellite positioning systems, geographic information systems, remote sensing and other modern high-tech mapping of Sanjiangyuan the 19 regions visited the source and synthesis of observation, was the surveying and mapping, meteorology, hydrology, glaciers, geological, environmental, geographical and other scientific data and information to fill the Sanjiangyuan region to the first of a number of gaps in data on scientific and rational determination of the Yangtze River, Yellow River, Lancang source location, the establishment of a national geographical indications, and other related research has laid a solid foundation.

在2008年9月6日至10月16日的综合考察中,科考队员历时41天,行程7300多千米,利用全球卫星定位系统、地理信息系统、遥感等现代测绘高新技术,对三江源地区有关的19个源头进行了实地考察和综合观测,获得了测绘、气象、水文、冰川、地质、环境、地理等方面的科学数据与资料,填补了三江源头地区地学数据的多项空白,对科学、合理地确定长江、黄河、澜沧江源头地理位置,建立国家地理标志,开展相关学科研究等奠定了坚实基础。

The principles of remote sensing in earth scinences were used in the investigation of resources and environment of the region to analyze hydrologic elements, regionalize hydrologic environment types, calculate water-yield; study the ratio relationship among agriclutural landuse, non-agriclutural landuse and total area, point out the regional difference of landuse type;res-earch the qualitative and quantitative perfects of low-yield area environment; cornprensively investigate forest resources, including ecologic environment of the suitable-forest area, site and ecologic and economic perfects of suitable-forest tree; find out the travel circle surrounding Beijing and function regionalization, storage mechanism of mineral resources and crustal stability, evolution of natural environment in last ten thounsand years and the relationship between them and land harnessing, planning and city and town construction.

本区资源与环境的遥感调查应用,主要是运用遥感地学原理,分析水文下垫面要素,划分水文环境类型,计算其产水量;分析非农业用地与总土地及其它用地的比例关系,探索土地利用类型结构的地域差异规律;农业低产地环境及其数量、质量特征的研究;综合调查森林资源,包括宜林地的生态环境、立地条件及宜林树种的生态与经济特性;以及以北京为中心的京津唐旅游圈及功能分区,矿产资源的赋存机制,区域地壳稳定性及区内近一万年来的自然环境的演化规律及其与国土整治、规划和城镇建设的关系等进行了多元综合研究。

We consider that fussy comprehensive evaluation method with weighted average matrix is suitable for the evaluation of Chinese little towns'sludge disposal and utilization through analyzing and comparing the comprehensive methods at present. This method conquers the disadvantage of using fussy matrix signally, which will ignores many affecting elements resulting in an inaccurate result.

通过对现有的综合评价理论和方法的分析比较,认为结合加权平均矩阵算法的模糊综合评判方法是适合中国小城镇污泥处置与资源化方式的决策评价的方法,该方法克服了单独使用模糊矩阵的算法忽略很多影响因素,结果不准确的缺陷,有效地提高了决策评价的准确度。

Chang was basically a pluralistic idealistic synthesist/eclectic, or more appropriately, he was both an ideal-ist and pluralist, and above all a synthesist/eclectic, though with strong idea-listic tendency, which accounted for his being called "idea-list" or "neo-idea-list" by many non-Marxists and all Marxists and their followers.

张东荪基本上可说是多元理想主义的综合论者,或更正确地说,张东荪既是理想主义者、也是多元论者、更是综合论者。虽然他有些强烈唯心论的倾向,而被许多非马列派学者和所有马列派学者看成是唯心主义者或新唯心主义者。

On the basis of analyzing the law of variation of the zero order current , the zero order voltage and the zero order power in the isolated neutral system, a synthetic criteria principle of selecting the grounded fault line according to three criterias at the same time was put forward.

在对中性点不接地系统单相接地故障情况下零序电流、零序电压以及零序功率的变化规律做了认真分析的基础上,提出了采用3个判据同时判断的故障选线三合一综合判据原理,这个综合判据可以大大提高接地选线的准确率,具有一定的推广利用价值。

Validating the range-synthesis model of time memory, in the research on retrospective time memory, in experiment 1, we selected 14 recognizable news events from 1995 to 2000,in experiment 2, fifteen film episodes and eight news segments were broadcasted aperiodically to examine the retrospective time memory;results showed that, the range-synthesis model of time had predictive validity to retrospective time memory.

对时间记忆的分段综合模型的验证,在回溯式时间记忆的研究中,实验1选取1995年到2001年之间发生可辨别的新闻事件14项,实验2在2个月的时间内不定期地给被试播放15个影视片断和8个新闻事件,要求被试进行回溯式时间回忆;结果发现,时间记忆的分段综合模型对回溯式时间记忆具有预测效度。

Aimed at these problem, this paper taked 63 well drilling's rock mineral document and logging document as main analysis object, combined reservoir sedimentology, sequence stratigraphy, logging geology together to research sedimentary system, sequence stratigraphy, lithofacies paleographic, sandbody distribution three dimensional visualization, reservoir character and reservoir sandbody comprehensive evaluation, it offers reference and criterion for Changbei gas field gas reservoir's exploration and development.

针对目前所存在的地质问题,本论文以63口钻井的岩矿资料和测井资料为主要分析对象,运用储层沉积学、层序地层学、测井地质学等多学科交叉的综合研究方法,对长北气田上古生界二叠系山西组2段进行沉积体系、层序地层、岩相古地理、砂体展布三维可视化、储层特征以及储集砂体综合评价和有利区预测等方面进行系统和深入的研究,为更有效地勘探开发长北气田提供科学依据。

By analyzing soil quality of 4 kinds of land use types in Kalamay agriculture development area according to principal component analysis, we draw the conclusions: nature shrub tree land is affected little by mankind, a great deal of organic matter return to soil every year, and root system can improve soil physical quality, can absorb salt from soil, so the soil quality of nature shrub tree land is the best; the soil quality of farmland is better than the soil quality of manpower Tamarix Bulrush land, which may be reasoned that man make for soil quality by irrigation to exclude salt and fertilizing organic muck in the earlier oasis digging up period. Soil physical qualities of tree land get harden and worsen for flooding irrigation, furthermore climate in Kalamay is dry and rainless , the other irrigation is very long time after the former one, so soil get harden severity and result soil physical quality get worse and worse.

利用主成分分析法分析新疆克拉玛依农业开发区四种土地利用方式下的土壤质量,得出:天然灌木林地,受人为影响较小,每年有大量有机物质返还土壤,且天然灌木的根系可以很好的改良土壤的物理性质,同时所选天然灌木林灌木多是耐盐碱并且本身又具有吸收积累来自土壤的盐分,土壤质量最好;农田受到的人为影响最大,但农田综合得分却好于人工柽柳芦苇地综合得分,这可能是由于在开垦初期的绿洲农田,受到了人们灌水压盐及增施各种有机无机肥料等有利于土壤质量提高的措施所致;乔木林地,由于人们用大水漫灌的方式灌溉,致使林地土壤变得板结,土壤物理性质下降,加上克拉玛依地区气候干燥少雨,一次灌溉后较长时间后才有下一次灌溉,致使土壤理化性质恶化,土壤质量不高。

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推荐网络例句

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。