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您的检索式：作者名="Tingfang Yan"
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| 1 | Comparative analyses of leaf anatomy of dicotyledonous species in Tibetan and Inner Mongolian grasslands显示文摘Knowledge of the leaf anatomy of grassland plants is crucial for understanding how these plants adapt to the environment. Tibetan alpine grasslands and Inner Mongolian temperate grasslands are two major grassland types in northern China. Tibetan alpine grasslands occur in high-altitude regions where the low temperatures limit plant growth. Inner Mongolian temperate grasslands are found in arid regions where moisture is the limiting factor. Few comparative studies concerning the leaf anatomy of grassland plants of the Tibetan Plateau and Inner Mongolian Plateau have been conducted. We examined leaf characteristics at 71 sites and among 65 species, across the alpine grasslands of the Tibetan Plateau and the temperate grasslands of the Inner Mongolian Plateau. We compared the leaf structures of plants with different life forms and taxonomies, and their adaptation to arid or cold environments. We explored relationships among leaf features and the effects of climatic factors (i.e., growing season temperature and precipitation) on leaf characteristics. Our results showed that (i) there were significant differences in leaf anatomy between Tibetan alpine and Inner Mongolian temperate grasslands. Except for mesophyll cell density, the values obtained for thickness of leaf tissue, surface area and volume of mesophyll cells were larger on the Tibetan Plateau than on the Inner Mongolian Plateau. (ii) Within the same family or genus, leaf anatomy showed significant differences between two regions, and trends were consistent with those of whole species. (iii) Leaf anatomy of woody and herbaceous plants also showed significant differences between the regions. Except for mesophyll cell density, the values obtained for the thickness of leaf tissue, and the surface area and volume of mesophyll cells were larger in herbaceous than in woody plants. (iv) Leaf anatomical traits changed accordingly. Total leaf thickness, thicknesses of lower and upper epidermal cells, and surface area and volume of mesophyll cells were positively correlated, while mesophyll cell density was negatively associated with those traits. (v) Growing season temperature had stronger effects on leaf anatomy than growing season precipitation. Although the communities in Tibetan and Inner Mongolian grasslands were similar in appearance, leaf anatomy differed; this was probably due to the combined effects of evolutionary adaptation of plants to environment and environmental stress induced by climatic factors. | MA JianJing JI ChengJun HAN Mei ZHANG TingFang YAN XueDong HU Dong ZENG Hui HE JinSheng | 2012 | Science China(Life Sciences)2012，55，1： | 12 |
| 2 | Mechanism Analysis of ' 7·21' Extremely Heavy Rainstorm Process in 2012 in Beijing显示文摘Extremely heavy rainstorm occurred in Beijing on July 21,2012,which was the most serious since 1961.Based on analyzing the precipitation characteristics,formation mechanism of the rainstorm process was analyzed.Results showed that when the precipitation process occurred,it was stable east-high and west-low situation at 500 hPa,and there was a steady stream of water vapor transportation at middle and low layers and strong vertical ascending motion at 700 hPa.The distribution of physical quantity field(relative humidity,vorticity and divergence)showed that they were all benefited to the formation of rainstorm.Then,falling zone of rainstorm and the movement of rain belt,generation,development and weakening of precipitation were analyzed.Finally,according to circulation situation and the distribution of physical quantity at each layer,vertical distribution of physical quantity and distribution of water vapor and jet stream, '7·21' rainstorm model was summarized. | Mao Weiping Yan Yan Wang Tingfang Zhang Youshu | 2015 | Meteorological and Environmental Research2015，6，1： | 0 |
| 3 | Analysis of electrochemical performance of lithium carbon fluorides primary batteries after storage显示文摘Lithium carbon fluorides(Li/CFx)primary batteries are of highly interests due to their high specific energy and power densities.The shelf life is one of the major concerns when they are used as backup power,emergency power and storage power in landers,manned spacecraft or military applications.In this work,real-time storage tests are carried out for both energy-type and power-type Li/CFx pouch batteries at 25℃.Accelerated storage tests are performed at elevated temperature of 55℃.The electrochemical tests are conducted throughout the aging period of 0-365 days for various batteries to study the effects of temperature on both type of batteries.The observed electrochemical behaviors are explained with the evidences from multiple characterizations for post-tested samples. | Wen Liu Tingfang Yan Rui Guo Guoju Dang Yong Li Haijuan Pei Qibin Yan Jingying Xie | 2021 | Journal of Materiomics2021，7，6： | 0 |
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