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多GCM模型集合下开都河流域未来气候变化预估 被引量:2
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作者 庄晓雯 李永平 曾雪婷 《南水北调与水利科技》 CAS CSCD 北大核心 2016年第3期24-29,42,共7页
基于逐步聚类分析的统计降尺度模型(SCADS模型),在多GCM模型集合的9个大尺度气象变量与开都河流域6个气象变量之间,建立统计降尺度关系,并进行开都河流域未来气候变化的预估。结果表明,SCADS模型生成的开都河流域各气象变量的模拟值与... 基于逐步聚类分析的统计降尺度模型(SCADS模型),在多GCM模型集合的9个大尺度气象变量与开都河流域6个气象变量之间,建立统计降尺度关系,并进行开都河流域未来气候变化的预估。结果表明,SCADS模型生成的开都河流域各气象变量的模拟值与实测值拟合较好。各气象变量在率定期(1961年-1990年)和验证期(1991年-1999年)的NSE系数均大于0.55,精度较高。此外,利用SCADS模型进行开都河流域各气象变量的预估。发现在三个不同时期内(2011年-2040年,2041年-2070年和2071年-2100年),月均气温升高,月均蒸发量、降水量、日照时数增加,月均相对湿度升高。 展开更多
关键词 gcm 气候变化情景 逐步聚类分析 统计降尺度模型 开都河 预估
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Employment Quality EvaluationModel Based on Hybrid Intelligent Algorithm
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作者 Xianhui Gu Xiaokan Wang Shuang Liang 《Computers, Materials & Continua》 SCIE EI 2023年第1期131-139,共9页
In order to solve the defect of large error in current employment quality evaluation,an employment quality evaluation model based on grey correlation degree method and fuzzy C-means(FCM)is proposed.Firstly,it analyzes... In order to solve the defect of large error in current employment quality evaluation,an employment quality evaluation model based on grey correlation degree method and fuzzy C-means(FCM)is proposed.Firstly,it analyzes the related research work of employment quality evaluation,establishes the employment quality evaluation index system,collects the index data,and normalizes the index data;Then,the weight value of employment quality evaluation index is determined by Grey relational analysis method,and some unimportant indexes are removed;Finally,the employment quality evaluation model is established by using fuzzy cluster analysis algorithm,and compared with other employment quality evaluation models.The test results show that the employment quality evaluation accuracy of the design model exceeds 93%,the employment quality evaluation error can meet the requirements of practical application,and the employment quality evaluation effect is much better than the comparison model.The comparison test verifies the superiority of the model. 展开更多
关键词 Employment quality fuzzy c-means clustering algorithm grey correlation analysis method evaluation model index system comparative test
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The Establishment of Mathematical Models for the Composition Analysis and Identification of Ancient Glass Products
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作者 Jenny Zhang Ding Li +1 位作者 Yu Xie Junfeng Xiang 《Open Journal of Applied Sciences》 2023年第11期2149-2171,共23页
Glass is the precious material evidence of the trade of the early Silk Road. The ancient glass was easily affected by the environmental impact and weathering, and the change of composition ratios affected the correct ... Glass is the precious material evidence of the trade of the early Silk Road. The ancient glass was easily affected by the environmental impact and weathering, and the change of composition ratios affected the correct judgment of its category. In this paper, mathematical models and methods such as Chi-square test, weighted average method, principal component analysis, cluster analysis, binary classification model and grey correlation analysis were used comprehensively to analyze the data of sample glass products combined with their categories. The results showed that the weathered high-potassium glass could be divided into 12, 9, 10 and 27, 7, 22 and so on. 展开更多
关键词 Principal Component Analysis System clustering Sensitivity Analysis Binary Classification model Logistic Regression Analysis grey Correlation Analysis
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金矿采场环境因素变化分析及灰色聚类评价 被引量:5
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作者 张天宝 纪洪广 李颂 《中国安全科学学报》 CAS CSCD 北大核心 2018年第9期142-147,共6页
为改善地下采场环境状况,保护作业人员安全与健康,利用灰色聚类模型(GCM),研究山东某金矿地下采场环境质量随采深的变化。监测并调查金矿-30、-70、-110、-150、-190、-230和-300m水平的7个采场中O2、CO2、温度、相对湿度、粉尘、有毒... 为改善地下采场环境状况,保护作业人员安全与健康,利用灰色聚类模型(GCM),研究山东某金矿地下采场环境质量随采深的变化。监测并调查金矿-30、-70、-110、-150、-190、-230和-300m水平的7个采场中O2、CO2、温度、相对湿度、粉尘、有毒气体、噪声及照度等采场环境指标,研究采场环境中单一指标随采深增加的变化趋势;运用GCM及G1法定权综合评价采场环境并分级;对该矿生产人员进行采场环境主观满意度问卷调查。结果表明:采场综合环境质量等级(EQGs)随采深增加而降低;问卷调查结果与灰色聚类评价结果有较好的一致性。 展开更多
关键词 金矿 采场 环境因素 灰色聚类模型(gcm) G1法 综合评价
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The Cooperation of Industrial Clusters and Regional Logistics of Shaanxi Province: An Evaluation Research
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作者 XIA Chun-yu 《International Journal of Plant Engineering and Management》 2013年第2期120-128,共9页
As a middle organization between enterprise organization which gains the competition advantage and eration of industrial clusters and regional logistics refers development of modern regional logistics. On the basis an... As a middle organization between enterprise organization which gains the competition advantage and eration of industrial clusters and regional logistics refers development of modern regional logistics. On the basis and market, industrial cluster is now the space industrial innovation advantage for a nation or a region. The coop- to improvement of industrial clusters' competitiveness and of reviewing the recent years' situation of Shaanxi Prov- ince's regional logistics and its industrial clusters, this paper analyzes positively about the supporting role of the regional logistics, builds gray relational model by choosing corresponding indicators, and carries out test of signif- icance. Finally it brings out strategic recommendations to and regional logistics enhance the level of cooperation of industrial clusters 展开更多
关键词 industrial cluster regional logistic grey relational model
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