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New Discovery of Macroscopic Cone Fossils from the Cambrian Series-2 Shuijingtuo Formation of Hubei, China
LIU Xuan, CHEN Chunhan, YANG Runyu, DONG Lin
Acta Scientiarum Naturalium Universitatis Pekinensis    2022, 58 (4): 644-654.   DOI: 10.13209/j.0479-8023.2022.041
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Macroscopic cone fossils, from the early Cambrian Shuijingtuo Formation of Shennongjia and Zigui areas, Hubei Province, were studied by using stereo light microscopy and scanning electron microscopy. A new species of the genus Sphenothallus was identified by its longitudinal ridges located within the “V” shaped thickenings. The genus Ambrolinevitus of the class Hyolithida was firstly described from Shuijingtuo Formation. The result enriches the biodiversity of the Shuijingshuo Formation and adds new palaeontological data for the research of early life evolution. 
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Study of Quit Willingness of Farmer’s Rural Residential Land from the Prospective of Human Capital: Case of Xinxiang in Henan Province
SHEN Haojing, FENG Changchun, CHEN Chun
Acta Scientiarum Naturalium Universitatis Pekinensis    2018, 54 (3): 680-686.   DOI: 10.13209/j.0479-8023.2017.182
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In order to explore the influence factors of farmers’ quit willingness of their rural residential land from the perspective of human capital theory, the authors report a survey from Xinxiang, a traditional agricultural area in Central China, and research the quit willingness of farmer’s rural residential land through interview and questionnaire survey. The authors build explanatory variable index system from three aspects: human capital, economic capital and land assets. A method of Logit model is applied to explore the main influence factors of farmers’ willingness to quit the right of farmer’s rural residential land. The results indicate that farmers don’t want to transfer their rural residential land in traditional agricultural area. Human capital is the important factor to affect the transfer of farmers’ rural residential land. Farmers’ knowledge and experience is important and significant for their quit willingness, rather than farmers’ education level. In addition, the impact of economic capital and land assets on farmer’s quit willingness is not significant. The research suggests that the government should raise farmers’ human capital from the aspects of enriching farmer’s knowledge and experience.

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Cause Analysis of Strong Wind in Xinjiang on February 28, 2007
HUANG Haibo,CHEN Chunyan,TAO Zuyu
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract604)      PDF(pc) (1484KB)(282)       Save
A strong wind blowed the train down and made great casualties in Xinjiang on February 28, 2007. The cause of this strong wind is analyzed based on the conventional meteorological data, anemometers along the railway and WRF model. The results show that the strong pressure gradient between Junggar Basin and Turpan Basin provided favorable dynamic conditions for the development of the strong wind. It was a downslope windstorm, the origin of this windstorm couldn’t be attributed to either the effect of narrow or the downward- tansporting of upper momentum, two factors might have made it such a damaging storm. 1) Vertically propagating gravity wave returns to the surface with strong wind after it is reflected many times by critical level and/or inversion layer. 2) The strong pressure gradient enables gap flow to be forced through valley more quickly in the range, accelerates the surface wind when the airflow drops sharply along the steep terrain.
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