3篇
您的检索式：作者名="YanYun Che"
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| 1 | Two new homoisoflavanones from Polygonatum odoratum (Mill.) Druce显示文摘Two new homoisoflavanones were isolated from the rhizomes of Polygonatum odoratum (Mill.) Druce and their structures were elucidated as (3R)-5,7-dihydroxy-8-methoxy-3-(4-methoxybenzyl)-6-methylchrom-an-4-one (1) and (3R)-5,7,8-trihydroxy-3-(4-hydroxybenzyl)-6-methylchroman-4-one (2), on the basis of spectral analysis. | Yong Qian Jing Yu Liang Wei Qu YanYun Che | 2010 | Chinese Chemical Letters2010，21，6： | 9 |
| 2 | Fingerprint analysis of Ophiopogonis Radix by HPLCUVELSD coupled with chemometrics methods显示文摘 | Ning Li Yanyun Che Liang Zhang | 2013 | Journal of Chinese Pharmaceutical Sciences2013，22，： | 1 |
| 3 | Spatio-temporal characteristics of human activities using location big data in Qilian Mountain National Park显示文摘Human activities significantly impact the environment.Understanding the patterns and distribution of these activities is crucial for ecological protection.With location-based technology advancement,big data such as location and trajectory data can be used to analyze human activities on finer temporal and spatial scales than traditional remote sensing data.In this study,Qilian Mountain National Park(QMNP)was chosen as the research area,and Tencent location data were used to construct time series data.Time series clustering and decomposition were performed,and the spatio-temporal distribution characteristics of human activities in the study area were analyzed in conjunction with GPS trajectory data and land use data.The study found two distinct human activity patterns,Pattern A and Pattern B,in QMNP.Compared to Pattern B,Pattern A had a higher volume of location data and clear nighttime peaks.By incorporating land use and trajectory data,we conclude that Pattern A and Pattern B represent the activity patterns of the resident and tourist populations,respectively.Moreover,the study identified seasonal variations in human activities,with human activity in summer being approximately two hours longer than in winter.We also conducted an analysis of human activities in different counties within the study area. | Minglu Che Yanyun Nian Siwen Chen Hao Zhang Tao Pei | 2023 | International Journal of Digital Earth2023，16，1： | 0 |
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