Coral cover as a proxy of disturbance:A case study of the biodiversity of the hermatypic corals in Yongxing Island, Xisha Islands in the South China Sea

The Yongxing Island is the biggest island of Xisha Islands in the middle part of the South China Sea. It occupies 1.8 square kilometers of land area and has permanent residence on it. There are only a few papers on the coral community of the Xisha Islands, reporting the species composition, structure and zonations of the hermatypic coral community in 1970s. The present study describes the hermatypic coral community based on the quadrat survey after almost 30 years in Yongxing Island in August 2002. It was the first time to present the percent cover data of live corals of Yongxing Island via a systematic scheme of quantitative quadrat sampling. The average total percent cover of the live coral is 68.4%. We found the total percent cover (TPC) could be an idea proxy of the overall disturbance regime impinging on the coral community. TPC can be used as an integrated measure of disturbance to coral reef. Using this surrogate, the best fit relation between TPC of the live corals and species richness, species diversity, or the species evenness is the unimodal second-order polymorphic parabola equation. This result is expected by the intermediate disturbance hypothesis (IDH). From the fitted parabola equations, we calculated the best TPCs corresponding to the maximal species richness, the highest species diversity, or the most evenness respectively. They are surprisingly stabilized between 55% and 58%. Coralcover is the basic parameter widely available for most observation, research or monitoring programs. The good qualitative characteristics of percent cover provide powerful tool for the experimental, theoretical and modeling studies of coral reef in response to the disturbance.     

神经元建模和脑功能成像的研究

长期以来，在理论上架建神经生理学和心理学之间的桥梁一直是神经科学家和认知科学家的研究方向和发展目标。根据电生理学的数据、神经生理学实验和神经心理学证据，本文建立了一种生物神经元的合理数学模型。该神经元模型构造的神经网络的动力学行为可以联系到一些神经生理现象和心理现象。本文还讨论了神经元建模、脑功能和功能成像三者之间的交叉问题。     

复生长曲线模型中参数的检验问题

本文讨论了复情形下生长曲线模型中尺度参数与位置参数同时检验的问题，设原假设定为Ｈ：∑＝Ｉ且ζ＝０文中给出修改似然比统计量在两类与原假设相接近的备样假上的渐近非零分布。     

关于Segal的Ingham求和法的猜想

这篇注记证明了S.L.Segal的一个猜想:对于某类函数F,一个lngham可和级数一定是F可和级数。     

穿孔性阑尾炎术式改良试验与统计分析

本文以详实的试验数据并应用数理统计方法对穿孔性阑尾炎术式改良进行了分析,结果表明,改良术式是成功的,取得了较好的社会经济效益,具有普遍的实用性,值得推广.     

Experimental evidence of the territorial defense,hypothesis in insular Blue Tits

Many insular vertebrates have unusually high population densities and are characterized by behavioural shifts including reduced territory size and reduced situation-specific aggressiveness. Compared to their mainland counterparts, Blue Tits on the island of Corsica exhibit many traits that fit the trends observed in crowded insular populations. We demonstrate from behavioural observations in aviaries and from hormone measurements that Corsican its are less aggressive than mainland ones. These shifts, as well as changes in reproductive patterns, support the defense hypothesis.     

模糊数学在地震震中烈度预测中的应用——以山西省为例

本文应用模糊假设分布原理，根据山西历史地震统计资料，建立了震级与震中烈度的模糊相关数学模型，根据震级和震中烈度的关系，即可预测未来强地震的震中烈度，为防震抗灾提供科学依据。     

WeУ1数列集合的势

本文在Cantor连续统假设下,证明了以Weyl数列为元素彼此互不相交的最大集Sna具有连续统之势,即不仅如此,纵使没有连续统假设,可证上述结论同样正确.     

二语习得理论与外语教学

第二语言习得理论是关于母语习得之后任何其他语言的学习规律的理论。语言学习与教学都应遵循语言习得的自然规律。对第二语言习得理论的研究有助于语言教学效率的提高,具有很重要的理论意义和实际价值。本文以第二语言习得理论为指导,研究和探讨语言习得对外语教学的影响以及在教学实践上的启示。