基于地理探测器的土壤重金属影响因子分析及其污染风险评价

地理探测器能快速定量化揭示驱动重金属含量影响因素的强度,这对于重金属空间预测模型构建变量的确定和土壤污染修复措施的精准实施具有重要意义.利用地理探测器模型,对5种土壤重金属元素Cu、Zn、Pb、Cr、Ni的空间分布和11种环境因子的交互作用进行定量评估,通过单因子指数法进行重庆市土壤重金属污染风险评价.结果表明:研究区...     

宝天高速公路沿线地表水环境现状评价的密切值法

以宝天高速公路为背景,讨论了公路建设对水体环境的主要影响,并利用改进的密切值法对公路沿线地表水进行水环境质量现状评价.通过评价表明:沿线地表水质量良好,基本达到地表水环境Ⅰ级标准;评价结果真实地反映了天宝高速公路沿线水体水质的基本情况,说明采用密切值法对水体进行评价是可行的;该方法概念清晰、计算简便实用,能较好地反映区域内各水体水环境质量的相对优劣,可为制定环境规划、进行环境决策、实施环境综合整治提供科学依据.     

有机溶剂中温法溶出光伏组件封装材料乙烯-醋酸乙烯酯

采用有机溶剂邻二氯苯中温法溶出模拟光伏组件的封装材料乙烯-醋酸乙烯酯(EVA),探究了不同条件下EVA的溶出率及模拟组件的分离率,通过正交实验确定了有机溶剂中温法处理EVA的最佳条件.实验结果表明,在反应温度160℃、固液比(光伏组件个数与邻二氯苯体积之比,个/mL)4:100、搅拌转速800 r/min、反应时间24...     

基于地形分区的射线跟踪法加速方法的研究

通过分析影响射线跟踪法计算效率的因素,提出一种基于多线程的用于开放地理环境中的射线跟踪加速方法,以提高射线跟踪法在计算机仿真中的计算效率。该方法应用于特定复杂战场电磁环境,根据电磁波射线传播特性,采用对地形分区的途径减少射线与规则三角面地形面的求交次数,同时使用多线程追踪单个辐射源的射线路径。经过对方法进行仿真计算,验证该方法的有效性。     

Theoretical and Empirical Analysis on Influence Factors of Modern Agricultural Equipment Level in the Processof Agricultural Sustainable Development

To promote modern agricultural equipment level is one characteristic of constructing and developing modern agriculture in China.This paper makes up stepwise linear regression analysis model of influence factors of modern agricultural equipment level,and chooses rural labor,per capita income of rural residents,rural investment,proportion of people at secondary education level and at higher level in per hundred rural labor force and arable land area as independent variables,and total power of machine as induced variable.The major results show that the relativity of modern agricultural equipment level,rural investment and education level of peasants is remarkable,and they are the major influence factors of modern agricultural equipment level.Raising investment level of rural infrastructure construction as well as and research and development and promotion of advanced and applicable modern agricultural equipment,improving quality and education level of peasants can accelerate the development of China’s modern agricultural equipment effectively in the process of agricultural sustainable development.