社会语言学对英语课堂教学的启示

社会语言学强调语言运用,突出交际能力,反对脱离社会文化研究语言。社会语言学有很多理论,尤其是语言交际能力理论以及语言变异理论对英语教学起到很大的指导作用。在这两个重要理论指导下,我们应注重提高语言交际能力,注重英语课堂的文化导入以及引导学生认识语言变异,从而达到良好的教学效果。     

廊坊市城市形象现状及对策

本文从河北省廊坊市形象的现状分析入手，探讨了廊坊城市形象存在的问题，从城市形象要素的方面提出了塑造城市形象的路线图。     

具有Holling IV型功能反应的分数阶捕食者-食饵模型的动力学分析

讨论了一类具有Holling IV型功能反应和Leslie-Gower数值反应的分数阶捕食者-食饵模型。利用分数阶微分系统的稳定性理论，给出了该系统在平衡点稳定的必要条件和充分条件。数值模拟也体现了分数阶微分系统的复杂性和丰富性。     

利用微积分确定函数方程的几种方法

目的:研究函数方程的确定。方法:从微积分的角度,对满足一定条件的确定函数关系的问题进行分类研究。结果:用微积分的内容,对常见的五类确定函数方程的问题进行了总结研究,给出了确定函数方程的一般方法。结论:概括了常见的用高等数学求函数方程的各种类型,有利于各个方面各种问题中函数关系的确定,便于研究自然界的变化规律。     

系统功能语法视野下英汉请柬的语篇差异及互译——兼论中西文化的相互转换

从人际意义资源、概念意义表征、及物性结构、主位结构与衔接手段分析了英汉请柬的语篇差异,从语言、思维、文化(心理)方面究了其原因,发现二者不应简单地字对字、句对句互译,而应在功能对等的前提下归化,即用译语读者习惯的方式传达邀约。     

Diversity and life-history traits of wild bees (Insecta: Hymenoptera) in intensive agricultural landscapes in the Rolling Pampa,Argentina

The decline of bees is a major concern due to their vital role in pollinating many crops and wild plants. Some regions in South America, and especially the Pampas, are amongst those parts of the world where stressors of bee populations have been little studied. The Pampas has been intensively transformed for agriculture, being presently one of the most productive areas of agricultural commodities in the world. Here, we aim to provide first insights on the taxonomic and functional composition of bee assemblages in the Rolling Pampa, the most intensively managed part of the Pampas. Soybean (herbicide-tolerant genetically modified varieties) is the predominant crop in this region. Bees were sampled with coloured pan traps. Sampling points were located on field margins in either the cropped or the semi-natural grassland area of a farmland site devoted to annual cropping. A total of 2384 individuals were caught, representing 33 taxa [mainly (morpho)species]. The subgenus Lasioglossum (Dialictus) largely dominated captures (78% of the total abundance) and was relatively abundant in the entire study area, suggesting that some species are likely to reach their ecological requirements in cropped areas. No-till fields and field margins may provide large areas for these below-ground nesting species, while their polylectic food preferences allow them to collect pollen on a wide range of plant species, among them possibly soybean. On the contrary, the richness and the abundance of other taxa were higher in the semi-natural area than in the cropped area. Among them, above-ground nesting or oil-collecting species, which have more specialised nesting and floral requirements, were highly associated with the semi-natural area. Our findings highlight the large dominance of L. (Dialictus) species in this highly intensively managed landscape, and the urgent need of preserving semi-natural habitats to maintain species-rich and functionally diverse bee communities in the Pampas.     

一类二阶非线性泛函微分方程的振动性

研究了一类二阶非线性泛函微分方程的振动性,建立了4个新的振动定理,并给出了其应用.推广了有关文献中的部分结果.     

政治学视角下的村务公开制度——基于安徽省潜山县的实证调查

安徽省潜山县的村务公开制度在实施过程中存在内容、程序和时效等方面的问题。从政治学视角来分析这些问题产生的原因，可以发现：推进村务公开制度需要坚持正确的利益导向、提高村民的政治参与水平、规范村级自治权力的运行以及加强监督机制的建设。     

园林植物功能与功能景观

在对园林植物功能进行详细总结与分类的基础上,提出了植物功能景观的概念和主要类型,指出了其在园林建设中的意义和具体应用途径.研究认为:园林建设的主要任务即是进行功能景观营建;应用功能景观理论不仅可以指导各类专项功能景观建设,而且还可以用于景观方案设计或现实景观评价.     

关于周期FDE与滞量的周期

本文指出当前关于周期FDE定义中存在的问题,给出命题的反例并提出明确建议.