在前人的研究基础上进行口语报告分析,形成图形推理的认知成分模型。引进多策略多成分潜在特质模型(MLTM for MS)将图形推理的认知成分模型与心理测量模型加以整合,对235名中学生图形推理认知特征进行诊断。结果发现:(1)图形推理总能力...在前人的研究基础上进行口语报告分析,形成图形推理的认知成分模型。引进多策略多成分潜在特质模型(MLTM for MS)将图形推理的认知成分模型与心理测量模型加以整合,对235名中学生图形推理认知特征进行诊断。结果发现:(1)图形推理总能力相同的被试,各成分对应能力即视知觉识别能力、规则构建能力、规则应用能力不一定相同。(2)被试使用知觉分析策略和分析策略的正确作答概率较高,而使用猜测策略的正确作答概率较低。展开更多
The Asiatic Dioscorea alata yam species is an important food crop, especially in Cote d＇lvoire. It has high yield and stores longer than Dioscorea cayenensis/rotundata yam and therefore fills the hunger gap created w...The Asiatic Dioscorea alata yam species is an important food crop, especially in Cote d＇lvoire. It has high yield and stores longer than Dioscorea cayenensis/rotundata yam and therefore fills the hunger gap created when other yam types arc not available. However, very little research has been done on it. Several cultivars are susceptible to pests and diseases and lack the aesthetic values of smooth skin and elegant tuber shape ofDioscorea rotundata that appeal to consumers in the market. This study therefore sought to establish the genetic variability and relationships among 35 accessions of Ghanaian Dioscorea alata together with 14 accessions introduced from International Institute of Tropical Agriculture in Nigeria. Morphological variation was studied to establish genetic relationship among 49 accessions assembled as Dioscorea alata in Ghana. Principal component analysis （PCA） indicated that the first two principal components accounted for 25.27% of total variation from accessions with PCA1 and PCA2, contributing 13.92% and 11.35%, respectively. Cluster analysis performed clearly separated the 49 accessions into three main groupings using unweighted neighbour-joining method. Morphological descriptors were able to group the accessions into distinct clusters independent of place of collection.展开更多
In karst regions,the spatial heterogeneity of soil mineral oxides and environmental variables is still not clear.We investigated the spatial heterogeneity of SiO2,Al2O3,Fe2O3,CaO,MgO,P2O5,K2O,and MnO contents in the s...In karst regions,the spatial heterogeneity of soil mineral oxides and environmental variables is still not clear.We investigated the spatial heterogeneity of SiO2,Al2O3,Fe2O3,CaO,MgO,P2O5,K2O,and MnO contents in the soils of slope land,plantation forest,secondary forest,and primary forest,as well as their relationships with environmental variables in a karst region of Southwest China.Geostatistics,principal component analysis(PCA),and canonical correlation analysis(CCA)were applied to analyze the field data.The results show that SiO2was the predominant mineral in the soils(45.02%–67.33%),followed by Al2O3and Fe2O3.Most soil mineral oxide components had a strong spatial dependence,except for CaO,MgO,and P2O5in the plantation forest,MgO and P2O5in the secondary forest,and CaO in the slope land.Dimensionality reduction in PCA was not appropriate due to the strong spatial heterogeneity in the ecosystems.Soil mineral oxide components,the main factors in all ecosystems,had greater influences on vegetation than those of conventional soil properties.There were close relationships between soil mineral oxide components and vegetation,topography,and conventional soil properties.Mineral oxide components affected species diversity,organic matter and nitrogen levels.展开更多
Based on theoretical analysis, similarity simulation tests, numerical simulation analysis and field observations, we analyzed rock collapse and rules of fraction evolution of overlying rocks and studied the rules in c...Based on theoretical analysis, similarity simulation tests, numerical simulation analysis and field observations, we analyzed rock collapse and rules of fraction evolution of overlying rocks and studied the rules in controlling the effect of an extremely thick igneous rock, found above a main mining coal seam in an area prone to coal mine disasters in the Haizi Coal Mine. The results show that this igneous rock, called a "main key stratum", will not subside nor break for a long time, causing lower fractures and bed separations not to close. The presence of igneous rock plays an important role in rock bursts, mine floods, gas outburst and surface subsidence in coal mines. By analyzing the rules in controlling the effect of this igneous rock, we provide useful references for safety and high efficiency mining in coal mines under special geological conditions.展开更多
In this paper,an HPLC-DAD-ELSD method was developed to determine main 20 components of Ginkgo biloba L.leaves from different ages and sources,including six flavonol glycosides,five terpene lactones and nine organic ac...In this paper,an HPLC-DAD-ELSD method was developed to determine main 20 components of Ginkgo biloba L.leaves from different ages and sources,including six flavonol glycosides,five terpene lactones and nine organic acids.Using statistics method and establishing relevant mathematics models,the measured data has proceeded correlation analysis,principal component analysis,and regression statistics and the results showed generality and specific characteristics.We defined p-hydroxybenzoic acid,catechinic,KRcG and ginkgolide A as characteristic indexes representing commonness and speciality of Ginkgo biloba L.leaf.The four characteristic indexes can reflect the quality of Ginkgo biloba L.leaf,and the intermal relations between them are significant.The contents of other compounds could define the quantity relation with characteristic markers.It simplified the approach of quality control,and provided a basis for quality control of Ginkgo biloba L.展开更多
文摘在前人的研究基础上进行口语报告分析,形成图形推理的认知成分模型。引进多策略多成分潜在特质模型(MLTM for MS)将图形推理的认知成分模型与心理测量模型加以整合,对235名中学生图形推理认知特征进行诊断。结果发现:(1)图形推理总能力相同的被试,各成分对应能力即视知觉识别能力、规则构建能力、规则应用能力不一定相同。(2)被试使用知觉分析策略和分析策略的正确作答概率较高,而使用猜测策略的正确作答概率较低。
文摘The Asiatic Dioscorea alata yam species is an important food crop, especially in Cote d＇lvoire. It has high yield and stores longer than Dioscorea cayenensis/rotundata yam and therefore fills the hunger gap created when other yam types arc not available. However, very little research has been done on it. Several cultivars are susceptible to pests and diseases and lack the aesthetic values of smooth skin and elegant tuber shape ofDioscorea rotundata that appeal to consumers in the market. This study therefore sought to establish the genetic variability and relationships among 35 accessions of Ghanaian Dioscorea alata together with 14 accessions introduced from International Institute of Tropical Agriculture in Nigeria. Morphological variation was studied to establish genetic relationship among 49 accessions assembled as Dioscorea alata in Ghana. Principal component analysis （PCA） indicated that the first two principal components accounted for 25.27% of total variation from accessions with PCA1 and PCA2, contributing 13.92% and 11.35%, respectively. Cluster analysis performed clearly separated the 49 accessions into three main groupings using unweighted neighbour-joining method. Morphological descriptors were able to group the accessions into distinct clusters independent of place of collection.
基金Under the auspices of Chinese Academy Sciences Action Plan for the Development of Western China(No.KZCX2-XB3-10)Major State Basic Research Development Program of China(No.2011BAC09B02)+2 种基金Strategic Priority Research Program-Climate Change:Carbon Budget and Related Issues'of Chinese Academy of Sciences(No.XDA05070404,XDA05050205)National Natural Science Foundation of China(No.31070425,31000224,U1033004)Guangxi Provincial Program of Distinguished Expert in China
文摘In karst regions,the spatial heterogeneity of soil mineral oxides and environmental variables is still not clear.We investigated the spatial heterogeneity of SiO2,Al2O3,Fe2O3,CaO,MgO,P2O5,K2O,and MnO contents in the soils of slope land,plantation forest,secondary forest,and primary forest,as well as their relationships with environmental variables in a karst region of Southwest China.Geostatistics,principal component analysis(PCA),and canonical correlation analysis(CCA)were applied to analyze the field data.The results show that SiO2was the predominant mineral in the soils(45.02%–67.33%),followed by Al2O3and Fe2O3.Most soil mineral oxide components had a strong spatial dependence,except for CaO,MgO,and P2O5in the plantation forest,MgO and P2O5in the secondary forest,and CaO in the slope land.Dimensionality reduction in PCA was not appropriate due to the strong spatial heterogeneity in the ecosystems.Soil mineral oxide components,the main factors in all ecosystems,had greater influences on vegetation than those of conventional soil properties.There were close relationships between soil mineral oxide components and vegetation,topography,and conventional soil properties.Mineral oxide components affected species diversity,organic matter and nitrogen levels.
基金the National Basic Research Program of China (No.2005CB221503)the National Natural Science Foundation of China (Nos.70533050 and 50674089)+1 种基金the National Foundation for the Youth of China (No.50904068)the Research Fund for the Youth of China University of Mining & Technology (No.OY091223)
文摘Based on theoretical analysis, similarity simulation tests, numerical simulation analysis and field observations, we analyzed rock collapse and rules of fraction evolution of overlying rocks and studied the rules in controlling the effect of an extremely thick igneous rock, found above a main mining coal seam in an area prone to coal mine disasters in the Haizi Coal Mine. The results show that this igneous rock, called a "main key stratum", will not subside nor break for a long time, causing lower fractures and bed separations not to close. The presence of igneous rock plays an important role in rock bursts, mine floods, gas outburst and surface subsidence in coal mines. By analyzing the rules in controlling the effect of this igneous rock, we provide useful references for safety and high efficiency mining in coal mines under special geological conditions.
基金National Administration of Traditional Chinese Medicine Standardization Project(Grant No.ZYBZH-C-HEB-16)
文摘In this paper,an HPLC-DAD-ELSD method was developed to determine main 20 components of Ginkgo biloba L.leaves from different ages and sources,including six flavonol glycosides,five terpene lactones and nine organic acids.Using statistics method and establishing relevant mathematics models,the measured data has proceeded correlation analysis,principal component analysis,and regression statistics and the results showed generality and specific characteristics.We defined p-hydroxybenzoic acid,catechinic,KRcG and ginkgolide A as characteristic indexes representing commonness and speciality of Ginkgo biloba L.leaf.The four characteristic indexes can reflect the quality of Ginkgo biloba L.leaf,and the intermal relations between them are significant.The contents of other compounds could define the quantity relation with characteristic markers.It simplified the approach of quality control,and provided a basis for quality control of Ginkgo biloba L.
