快速城市化地区道路对两侧土地利用影响模式研究

基于多时段的卫星影像和土地利用变更调查数据,选取深圳市14条主要道路的代表性影响路段,用城市化影响指数(U)表征道路对土地利用的影响.以社会经济背景、地形条件、道路等级和道路运营年限为道路特征参数,基于相关性和非线性回归分析的方法研究道路对两侧土地利用影响的模式及其成因.研究发现,道路特征参数对两侧土地利用强度的影响表现出显著的差异性,其中,社会经济背景是道路对土地利用影响的主要影响因素,道路运营年限的影响主要表现在道路近距离区域,道路等级在中距离区域,而地形条件影响主要在远距离区域.道路对土地利用的影响模式分为3类,即山峰型、递减型和山谷型,而不同道路特征参数被认为是导致道路影响模式差别的主要原因.根据U值变化的曲线拟合分析得到各道路的影响范围,结果表明,快速路和主干路的影响范围较大,城市化进程起步较早、社会经济发展水平较好的西部地区道路影响范围大于东部.     

论品牌文化建设中的环保之路

随着社会的发展，企业品牌已成为市场竞争的重要因素，本文主要对当前中国企业品牌文化建设及其环保理念进行了探讨。     

Climate Change Projections for the United States Midwest

Environmental and societal factors such asair quality, water quality andavailability, land use changes andexpanding urbanization are alreadyaffecting human health and welfare,agriculture, and natural ecosystems in theMidwestern United States. Over thiscentury, these existing stresses willlikely be exacerbated by climate changesresulting from human activities. It isessential that policy decisions aimed atpreserving the well-being of a region beinformed by a good understanding of theregion's climate, how climate might change,and the uncertainties inherent in futureprojections. Recent updates in climatemodeling expertise and an expanded view ofpossible non-intervention emissionscenarios have narrowed the range of changethat can be expected over the Midwestthroughout the next century in some ways,while broadening it in others. In contrastto previous studies, which generallyconsider a mid-range scenario for futureemissions, this study presents the range ofchange that would result from low to highscenarios for climate change. In this waywe account for uncertainties inanthropogenic forcing on climate change inthe region and quantify the potentialeffects of human actions on future climate.This analysis also combines the latestclimate model projections with historicalrecords of observed climate over the pastcentury, effectively placing potentialchanges in extreme event frequencies suchas heavy rainfall events and temperaturethreshold exceedances within the context ofobserved variability over the past century.The purpose of this study is to provide anupdated picture of the potential impacts ofclimate change on the Midwest to inform theimpact assessment and policy developmentcommunity. From the magnitude of thechanges projected by this study, it isclear that these must be included in futurepolicy decisions in order to ensure thesuccessful adaptation and survival ofexisting human and natural systems in theMidwest.     

英语教学中的文化导入

语言和文化是密不可分的,在外语教学中要达到语言与文化并重的目的,就要充分重视文化导入的问题.本篇文章详细阐述了文化导入问题在英语教学中的重要性以及外语教学中文化导入的内容及方法.     

Effects of some heavy metals on cell suspension cultures of Catharanthus roseus

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Dissimilatory reduction of Fe~III (EDTA) with microorganisms in the system of nitric oxide removal from the flue gas by metal chelate absorption

IntroductionThecombustionoffossilfuelsgeneratesSO2 andNOxpollutantswhichcauseairpollutionandacidrain .Existingfluegasdesulfurization(FGD)scrubbersinvolvelimestoneprocesses,whichareefficientforcontrollingSO2 emission ,butareincapableofremovingalmostwater i…     

对安全文化及其与安全科学之间关系的探讨

对安全文化概念的理论提出了新认识，并通过与安全科学之间关系的分析，指出了安全文化理论与实践的研究方法。     

哑铃湾网箱养殖环境容量研究Ⅱ.网箱养殖环境容量计算

根据作者自己建立的网箱养殖污染负荷模型，结合二维水动力和水质数学模型，对哑铃湾网箱养殖环境容量进行了计算。结果表明，随着养殖时间的增加，该海域养殖容量不断地变小，当预计只养1a时，它的容量为54100箱，10a以后，它的容量就变为34500箱。而目前该海域只有4000箱左右的网箱，还远远没有达到它的环境限制容量。     

Trisomy 20 mosaicism

A further case of trisomy 20 mosaicism found at amniocentesis is presented. Pregnancy was terminated, the fetus showed facial dysmorphia and minor cardial and renal anomalies. 19 published reports of true trisomy 20 mosaicism at amniocentesis are reviewed. Five pregnancies resulted in obviously normal newborns. The significance of mostly minor anomalies found at autopsy of 7 fetuses remains unclear. With regard to genetic counselling the significance of trisomy 20 mosaicism is summarized as follows: (1) true trisomy 20 mosaicism in amniotic fluid cells reflects mosaicism of the fetus; (2) severe malformation is not a major feature of trisomy 20 mosaicism; (3) the risk of mental retardation is still undetermined, due to limited experience. However, there is no definite proof that the condition is harmful at all.     

虾塘残饵腐解对养殖环境影响的研究Ⅰ. 虾塘底层残饵腐解对水质环境的影响

通过室内模拟实验，研究了虾塘底层残饵腐解对虾池水质的影响和更换虾池海水后底层水质质量的变化和清除覆盖于池底的残饵后池底底层水质的变化。结果表明，由于池底残饵的腐解，使虾池水质变坏， Ｄ Ｏ降至零，ｐ Ｈ 下降至６０ ，达不到生物存活的水平。更换虾池海水后，池底水质仍然受到一定的影响。清除池底残饵后，由于沉积物的吸附作用，大量硫化物又释放出来，仍然严重影响虾池的水质质量。数据表明，在养虾过程中应尽量减少虾饵的残留量并做到每年彻底清洁池底，达到清洁养殖的环境标准