Ecological environment quality evaluation of the Sahel region in Africa based on remote sensing ecological index

Long-term monitoring of the ecological environment changes is helpful for the protection of the ecological environment.Based on the ecological environment of the Sahel region in Africa,we established a remote sensing ecological index(RSEI)model for this region by combining dryness,moisture,greenness,and desertification indicators.Using the Moderate-resolution Imaging Spectroradiometer(MODIS)data in Google Earth Engine(GEE)platform,this study analyzed the ecological environment quality of the Sahel region during the period of 2001-2020.We used liner regression and fluctuation analysis methods to study the trend and fluctuation of RSEI,and utilized the stepwise regression approach to analyze the contribution of each indicator to the RSEI.Further,the correlation analysis was used to analyze the correlation between RSEI and precipitation,and Hurst index was applied to evaluate the change trend of RSEI in the future.The results show that RSEI of the Sahel region exhibited spatial heterogeneity.Specifically,it exhibited a decrease in gradient from south to north of the Sahel region.Moreover,RSEI in parts of the Sahel region presented non-zonal features.Different land-cover types demonstrated different RSEI values and changing trends.We found that RSEI and precipitation were positively correlated,suggesting that precipitation is the controlling factor of RSEI.The areas where RSEI values presented an increasing trend were slightly less than the areas where RSEI values presented a decreasing trend.In the Sahel region,the areas with the ecological environment characterized by continuous deterioration and continuous improvement accounted for 44.02%and 28.29%of the total study area,respectively,and the areas in which the ecological environment was changing from improvement to deterioration and from deterioration to improvement accounted for 12.42%and 15.26%of the whole area,respectively.In the face of the current ecological environment and future change trends of RSEI in the Sahel region,the research results provide a reference for the construction of the"Green Great Wall"(GGW)ecological environment project in Africa.

建构主义视角下的幼儿园活动室墙面环境创设

从建构主义的视角看,目前幼儿园活动室墙面环境创设存在教育价值突显不够、幼儿主体性体现不足、内容适宜度有待提高等问题。为此,幼儿园活动室墙面环境创设要有明确的教育目标和教育理念,允许幼儿全面地接触、享受墙面环境,真正发挥幼儿在墙面环境创设中的主体性,以幼儿的年龄特点、真实需要、已有知识经验等创设动态、多元的活动室墙面环境。

内蒙额尔古纳成矿带中生代火山岩浆活动与金属成矿的关系

在岩石学和微量元素地球化学研究的基础上，通过对不同类型矿床的成矿岩体及围岩条件的分析，探讨了中生代火山岩浆活动与金属成矿的关系。认为晚侏罗世火山岩浆活动为成矿提供了有利的围岩和构造空间；早白垩世岩浆活动提供了成矿岩体及热力学条件，该期次火山岩浆的侵入并作用于不同的围岩，形成了由斑岩型Ｃｕ、Ｍｏ矿，浅成热液型Ａｇ、Ｐｂ、Ｚｎ矿等组成的一系列矿床组合。

植物生态墙对室内环境的影响分析

测试并模拟西安地区一室内植物墙建筑室内热湿环境,应用Fluent软件对建筑物内墙壁有绿化空间的室内空气温度和气流速度模拟,并与没有植物墙的空间进行分析对比,得出室内植物墙可以降低室内环境温度0.7℃,有效增加室内空气湿度。分析发现植物墙的降温作用与植物的蒸腾作用、栽培基质中水分的蒸发有关。

主动降噪技术应用于船舶舱室的可行性分析

为了提高船舶舱室的内装水平,优化舱室声环境,本文提出一种采用主动降噪技术解决噪声问题的方法。通过对船舶舱室噪声环境和房间模式的分析,得出主动降噪技术在舱室中应用的可行性。根据主动降噪技术的应用分析,提出应用路线。

幼儿园活动室内墙面环境创设现状及策略研究——以楚雄城区公立幼儿园为例

作为幼儿在园学习和生活的一个重要场所——活动室,其墙面环境的创设与布置无疑会对幼儿产生潜移默化的影响。然而,部分教师在墙面环境的创设中还存在一些的问题。本文通过调查,以楚雄城区公立幼儿园为例,指出幼儿园活动室内墙面环境创设的现状,并根据现状进行了策略分析研究。

基于机场环境的异厂家有源室分分析

当今通信市场主流设备厂家较多,很多地区存在设备异厂家的情况。因此,需使用传统无源室分进行基础网络覆盖,保证语音通话的畅通。另外,需结合场景和投资效益,适当进行有源室分的建设,确保数据业务的稳定。因此,以机场环境为例进行仿真,结果表明,异厂家有源室分可实现话务热点区的有效吸容。

试谈幼儿园活动室的环境创设问题

环境是重要的教育资源。当前幼儿园的活动室环境创设存在许多问题，与园长、教师对活动室环境创设不够重视、能力较低等有很大关系。园长应努力成为幼儿园活动室环境创设的设计师和评价者，教师则要根据教学内容、活动室特点及幼儿需要，因地制宜创设活动室环境。活动室环境创设要鼓励幼儿参与，有序呈现材料，努力提高空间利用率。