无线移动通讯技术在近海环境监测中的应用

无线移动通讯技术在海洋应急监测、近海浮标监测和海洋执法中发挥越来越重要的作用.本文首先介绍了无线移动通讯技术在海洋监测中的应用优势、技术特点等,进而提出了基于GSM/GPRS/CDMA技术的海洋环境监测系统,最后列举了目前较成熟的应用事例,旨在推广无线移动通讯技术在海洋领域的应用.     

多区蜂窝CDMA系统中的干扰及其抑制

在分析多区蜂窝ＣＤＭＡ系统干扰的基础上,提出了开,闭环结合的功控方式,要求和以载干比（ＣＩＲ）为基础的功控算法,从而抑制干扰,改善系统性能,增加系统容量。     

MA-2000型测汞仪直接测定环境水体中的汞

介绍了MA-2000型测汞仪测定环境水体中的汞,以氯化亚锡为还原剂,0．001％半胱氨酸为汞固定剂,在一定浓度范围内被测汞蒸汽在波长253．7nm紫外光下的吸收值与汞蒸汽浓度成正比。方法检出限0．006ng,精密度和准确度均满足水质监测实验室质量控制的要求。     

2000年全球重大自然灾害概述

２０００年是全球自然灾害经济损失较为一般的年份。根据收集到的全球自然灾害记录的数据，客观地对全球主要自然灾害的特征和分布特点进行了分析，并对其成因进行了探讨．     

交通环境Y2K问题

综述了包括中国计算机２０００年问题的现实情况，交通环境Ｙ２Ｋ问题情况，Ｙ２Ｋ有关法律问题以及防范计算机病毒攻击。     

Excel 2000的应用研究-统计学生成绩

本文以Excel 2000统计学生全班成绩表为例,介绍基本的Excel输入资料、统计成绩(计算总分、计算平均分、计算最高分最低分、排列名次)、制作图表等功能.     

Carrousel 2000氧化沟在矿区生活污水处理中的应用

主要阐述了Carrousel氧化沟的结构、工艺机理,并介绍了此工艺的实例及主要技术参数.     

矿产资源人口承载力研究

本文建立了矿产资源人口承载力分析的指标体系与计算模型,并对现有资源和预测资源的人口承载力进行了定量计算和分析;确定了２０００年、２０１０年的矿产资源人口承载数量。     

An Endangered Longhorn Beetle Associated with Old Oaks and Its Possible Role as an Ecosystem Engineer

Abstract:  For more than 10 years, ecologists have been discussing the concept of ecosystem engineering (i.e., nontrophic interactions of an organism that alters the physical state of its environment and affects other species). In conservation biology, the functional role of species is of interest because persistence of some species may be necessary for maintaining an entire assemblage with many threatened species. The great capricorn ( Cerambyx cerdo ), an endangered beetle listed in the European Union's Habitats Directive, has suffered a dramatic decline in the number of populations and in population sizes in Central Europe over the last century. The damage caused by C. cerdo larvae on sound oak trees has considerable effects on the physiological characteristics of these trees. We investigated the impacts of these effects on the species richness and heterogeneity of the saproxylic beetle assemblage on oaks. We compared the catches made with flight interception traps on 10 oaks colonized and 10 oaks uncolonized by C. cerdo in a study area in Lower Saxony (Germany). Our results revealed a significantly more species-rich assemblage on the trees colonized by C. cerdo . Colonized trees also harbored more red-listed beetle species. Our results suggest that an endangered beetle species can alter its own habitat to create favorable habitat conditions for other threatened beetle species. Efforts to preserve C. cerdo therefore have a positive effect on an entire assemblage of insects, including other highly endangered species. On the basis of the impact C. cerdo seems to have on the saproxylic beetle assemblage, reintroductions might be considered in regions where the species has become extinct.     

蜂窝电话用锂离子电池的环境试验

国家标准GB/T18287-2000《蜂窝电话用锂离子电池总规范》中明确规定了锂离子电池的20℃常温,高温,恒定湿热性能,震动,碰撞,自由跌落等环境试验的具体方法及环境试验后的放电性能测试方法。