凤冈县优质稻病虫害可持续控制技术探讨

水稻是人们最基本的食物，优质稻的生产及优化是一个发展趋势。凤冈县位于贵州省东北部，是黔北粮仓之一，冬无严寒，夏无酷暑，雨热同季，雨量丰富，年平均降雨量1260mm，年平均温度15，2℃，平均海拔720m,适合优质稻生长。我县优质稻种植规模逐年加大，现年种植面积在8万余亩，     

非洲"水廊"刚果河

翻开非洲地图,首先跃入你眼帘的是在中西部的一条呈巨大弧形的河流,它密如蛛网的支流如条条动脉跳跃在辽阔的非洲大陆上。这就是刚果河。     

自主创新演绎"江汽现象"

没有国家资金投入,缺乏政策资源,无外资合作背景,依靠自主创新和自我滚动发展,江汽集团如何从一个净资产为负值、销售收入仅3000万的亏损企业,发展成为销售收入108亿元,且具有自主知识品牌的大型企业集团?如何创造了连续14年平均增幅52%的速度的?江汽给我们的答案是:将技术创新、管理创新和机制创新作为企业发展的支柱,坚持以创建学习型组织为核心的企业文化总揽全局,协调平衡系统推进企业的可持续发展.     

极光映照格陵兰

格格陵陵兰兰岛岛,,一一个个气气候候恶恶劣、人口稀少的岛屿,却吸引了一批又一批的探险家和和科科学学家家来来此此进进行冒险和科学研究。格陵兰究竟有怎样的魅力,让人对它如如此此着着迷?格陵兰人的生活是什么样的?因为工作的原因,我跟随摄制组在格陵兰停留了一个多月,有幸能够深入体会这片大陆的自然环境和风土人情,探索它的神奇与美丽。格陵兰全世界最大的岛屿,面积超过216万平方千米,是新疆面积的1.3倍;比排名第     

Construction of habitat suitability models （HSMs） for benthic macroinvertebrate and their applications to instream environmental flows： A case study in Xiangxi River of Three Gorges Reservior region, China

Based on a long-term ecological monitoring,the present study chose the most dominant benthic macroinvertebrate(Baetis spp.)as tar-get organisms in Xiangxi River,built the habitat suitability models(HSMs)for water depth,current velocity and substrate,respectively,which is the first aquatic organisms model for habitat suitability in the Chinese Mainland with a long-term consecutive in situ measurement.In order to protect the biointegrity and function of the river ecosystem,the theory system of instream environmental flow should be categorized into three hierarchies, namely minimum required instream flow(hydrological level),minimum instream environmental flow(bio-species level),and optimum instream environmental flow(ecosystem level).These three hierarchies of instream environmental flow models were then constructed with the hydropogical and seighted usable area(WUA)method.The results show that the minimum required instream flow of Yiangxi River calculated by the Tennant method(10% of the mean annual flow)was 0.615m3s-1;the minimum instream environmental flow accounted for 19.22% of the mean annual flow(namely 1.182m3s-1),which was the damaged river channel flow in the dry season;and 42.91% of the mean annual flow(namely 2.639m3s-1)should be viewed as the optimum instream environmental flow in order to protect the health of the river ecosystem,maintain the instream biodiversity,and reduce the impact of small hydropower stations nearby the Xiangxi River.We recommend that the hydrological and biological methods can help establish better instream environmental flow models and design best management practices for use in the small hydropower station project.     

观冲绳美丽海水族馆

冲绳群岛位于日本西南群岛的最南端，由大小70多个岛屿组成。它以“从太平洋进入亚洲的门户”而闻名世界。主岛冲绳位于亚热带，年平均气温20～24℃，是一个东西窄、南北长的岛屿，由于地理条件的差异，自然风貌与日本其他地区截然不同。被称为“太阳乐园”的冲绳，像一幅美丽的亚热带风景画，晴空万里、碧海无垠、百花争艳、绿树成荫。     

下野地垦区近40年气温变化特征分析

<正>自20世纪80年代以来,许多气候学家对全球气候做了不少研究,指出在过去的100年里,全球平均气温上升了0.3~0.6℃。近40年我国平均气温也以0.04℃/10年的速率上升,年降水量以12.6mm/10年的速率递减。在新疆,近40a北疆年平均气温增温     

某矿铀尾渣场年平均氡析出率监测结果分析

本文介绍了利用活性炭吸附法监测某矿铀尾矿库年平均氡析出率测量结果,对方法的特点和测量结果进行了全面的分析.     

普陀区风能分析

利用沈家门30年风速资料及近几年建设的8个自动气象站风速资料,对普陀区的风能资源特征量进行计算分析.结果表明,普陀区属于风能资源丰富区,具有很高的开发价值.年平均风速3.9～6.7 m/s,风速分布自西向东逐渐增大.风速≥3 m/s的年有效风速时为5 568～7 708 h,风速≥6 m/s的年有效风速时为2 206～4 699 h.平均风能密度最大值达298.5W/m2,最小值为130.4 W/m2.风能随高度而明显增加,而50～70 m这层厚度上风能变化不大.并分析了4个最佳风能区风速和风向频率,可以极大提高风能的利用率.     

A new interpolation method for Antarctic surface temperature

We propose a new methodology for the spatial interpolation of annual mean temperature into a regular grid with a geographic resolution of 0.01° for Antarctica by applying a recent compilation of the Antarctic temperature data.A multiple linear regression model of the dependence of temperature on some geographic parameters (i.e.,latitude,longitude,and elevation) is proposed empirically,and the kriging method is used to determine the spatial distribution of regional and local deviations from the temperature calculated from the multiple linear regression model.The modeled value and residual grids are combined to derive a high-resolution map of surface air temperature.The performance of our new methodology is superior to a variety of benchmark methods (e.g.,inverse distance weighting,kriging,and spline methods) via cross-validation techniques.Our simulation resembles well with those distinct spatial features of surface temperature,such as the decrease in annual mean surface temperature with increasing latitude and the distance away from the coast line;and it also reveals the complex topographic effects on the spatial distribution of surface temperature.