L－S方法在周期系统的应用

本文用分支函数法，通过几个较为一般的实例进一步说明了Ｌ－Ｓ方法在局部分支理论中的广泛应用，从而将确定局部周期解的个数转化成易懂的代数运算。     

An integrative estimation model of summer rainfall-band patterns in China

Three variation indices are defined to objectively and quantitatively represent fluctuations of three rainfall-band patterns in summers in China for the period from 1951 to 2005, and the variation features of these indices are analyzed on both of interdecadal and interannual scales. A new method is proposed to establish an integrative estimation model based on the analysis of rainfall-band indices, and the model is applied to air, ocean factors to estimate their roles on variations of three rainfall-band patterns on different time-scales. The tests of estimation effects show that the fluctuations of three rainfall-band patterns are composed of variations on both significant inter-decadal and interannual scales, of which the interannual variation is mainly influenced by the Elnino/Lanina events, the East Asia monsoon and the ridge locations of subtropical high pressures in western pacific, while the interdecadal variation is mainly controlled by the Pacific decadal oscillation and interdecadal oscillations of the Arctic oscillation, ENSO, Nino3 sea surface temperature and summer monsoon. The estimated results from the integrative estimation model of rainfall-band patterns suggest that the way of estimation first according to each time scale of both the interdecadal and interannual scales, then estimating with an integration, which is proposed in this paper, has an obvious improvement on that without separation of time scales.     

具有阶段结构的捕食系统的全局渐近稳定性

研究一类捕食者与食饵均具有阶段结构的捕食模型的稳定性.通过分析模型的特征根,得到了非负平衡点局部稳定性的条件.利用比较定理、迭代方法等性质证明了非负平衡点的全局渐近稳定性.并举实例说明所得结果的有效性.     

高职生羞怯、焦虑、孤独与人际和谐的关系

采用人际和谐量表、羞怯量表、焦虑量表和孤独量表对1 548名高职生进行调查。结果显示:高职生羞怯、焦虑和孤独在性别上存在显著的差异,其中女生显著高于男生;在同学和谐、师生和谐以及族际和谐上男生显著高于女生;羞怯与焦虑、孤独呈非常显著的正相关,焦虑与孤独呈非常显著的正相关;羞怯、焦虑、孤独与人际和谐呈显著的负相关;高职生的羞怯和焦虑程度对人际和谐具有显著的预测作用。     

1，1′－联－2－萘酚双醚的合成

报导在ＫＦ－Ａｌ２Ｏ３存在下，１，１′－联－２－萘酚与一元卤代烷、溴乙酸乙酯的反应得到Ｏ－双取代１，１′－联－２－萘酚双醚和１，１′－联萘－２，２′－双氧乙酸乙酯．后者进一步氨解或水解以高产率制得相应的１，１′－联萘－２，２′－双氧乙酰胺和１，１′－联萘－２，２′－双氧乙酸．     

带状采伐对毛竹林土壤细菌群落结构及多样性的影响

[目的]研究带状采伐后毛竹(Phyllostachys edulis)林土壤细菌群落结构及多样性的变化,认识带状采伐对毛竹林土壤生态系统的影响,为利用带状采伐实现毛竹林规模化经营提供指导.[方法]对毛竹林进行不同宽度(3、9、15m)的带状采伐,25d后采集样地内土壤样品,采用Illumina MiSeq高通量测序技术...     

腺病毒介导MTS1的抑癌作用

人多肿瘤抑制因子（MTS1）是一个抑瘤基因,在许多原发性肿瘤及细胞系中都发现了它的突变,有潜在应用价值。由于腺病毒独特的性质,它介导的肿瘤基因置换疗法,受到了愈来愈多的应用与关注。人癌胚抗原启动子能指导组织特异性表达。将癌胚抗原启动子置于MTS1基因上游,并在下游加poly A化信号,通过穿梭质粒pΔE1SP1A在人胚肾细胞HEK 293中与腺病毒载体pBHG11进行同源重组,插入腺病毒E1区。获得的重组病毒粒子作用于人乳腺癌细胞系MCF7,初步表明重组腺病毒能抑制MCF7的生长。