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eco
相关语句
  生态
     Use Eco-Tax to Protect Environment:Basic Theory and Case Study
     利用生态税收保护环境:生态税收基本理论和若干国家的生态税收实践
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     Since the 1970s eco socialists have been concerned with the relationship between eco socialism and Marxism.
     自 70年代以来 ,生态社会主义者一直关注生态社会主义与马克思主义的关系 ,有否定与肯定马克思主义生态思想两派。
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     (6)eco environmental construction and restoration in agricultural and rural areas;
     (6)农业与农村生态环境建设与生态恢复问题 ;
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     The Major Technical Types of Agricultural Eco engineering in China
     中国农业生态工程的主要技术类型
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     Study of the Eco factors of Main Soils influencing the Rice Quality
     影响稻米品质的主要土壤生态因子研究
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  “eco”译为未确定词的双语例句
     STUDY ON RFLPs OF THE TRANSFORMING GENES OF PRIMARY HEPATIC CARCINOMA(Ⅰ)RFLPs OF GENOMIC ONCOGENE N-ras OF CHINESE HAN NATIONALITY FOR RESTRICTION ENZYME Eco RI
     原发性肝癌转化基因的RFLPs研究(Ⅰ) 中国汉族人基因组癌基因N-ras对限制酶Eco RI的RFLPs
短句来源
     Effect of Alfalfa on the Soil Eco Environment.
     苜蓿对土壤生态环境的影响
短句来源
     Qualitative Evaluation of Urban Eco-environment of Tieling Municipality
     铁岭市城市生态环境质量评价
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     ECO—Environment and Disasters of Flood and Drought
     生态环境与洪旱灾害
短句来源
     Evaluating Models of Eco—Climate Suitability to Herbage
     牧草生态气候适宜度评价模型
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  相似匹配句对
     Legend of ECO
     ECO传奇
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     ECO Resort
     生态胜地
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  eco
Eco-emigration and the return of marginal agricultural land to forestry can be practiced.
      
Relationships between xylem embolism and eco-physiological indices in eight woody plants in situ (II): The relationship with pho
      
The relationship between xylem embolism and eco-physiology indices (i.e.
      
Four different kinds of water treatments were applied to study the photosynthetic eco-physiological characteristics of Taxodium ascendens seedlings in the environment of the Three Gorges hydro-fluctuation belt.
      
Vegetation restoration is a key measure to improve the eco-environment in Loess Plateau, China.
      
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This paper is confined to a discussion of prevention of seepage from earth dams by means of blankets upstream which is considered to be a method for greater,quicker,better and more eco- nomical results.The following main problems are included: 1.Ideas of possibilities of piping through foundation soil and resistance of soil to percola- tion,and their effects on calculations of the lengths of blankets; 2.Calculations of economical and safe lengths of blankets and discharge of seepage; 3.Determination of...

This paper is confined to a discussion of prevention of seepage from earth dams by means of blankets upstream which is considered to be a method for greater,quicker,better and more eco- nomical results.The following main problems are included: 1.Ideas of possibilities of piping through foundation soil and resistance of soil to percola- tion,and their effects on calculations of the lengths of blankets; 2.Calculations of economical and safe lengths of blankets and discharge of seepage; 3.Determination of the line of saturation behind a inclined wall and the equipotential line below a blanket. The choice of the minimum blanket length depends in the main on the following conditions: 1.The seepage gradient through the dam foundation below the blanket jo is lower than or equal to the allowable gradient for the soil in the dam foundation(in consideration of no de- formation in seepage); 2.The discharge of seepage per unit width q is lower than or equal to the allowable design discharge (in consideration of storage and exploitation of water energy). Based on the subdivision principles of and the above-mentioned con- siderations,the following equations are derived.For the first condition,the blanket length is calculated from Equation(15);and that for the second condition,Equation(14). When the blanket length is known,the discharge of seepage can be calculated from Equa- tion (18). The blanket thickness is calculated by Equation(25). The 72 experiments made in the laboratory show that the formulas presented in the paper appear to be for the present more accurate than that of other scholars at home and abroad. The theoretical analysis and experiments may lead to the following important ideas regarding prevention of seepage by means of blankets: 2.The less the permeability of a blanket(k_0/k_n>5000)is,the greater its effect of seepage prevention will be,and vice versa; 2.Independent of the permeability of a blanket,there exists the idea of“effective blanket length”,i.e.,for a length larger than the effective length,the effect of seepage prevention of blanket is its permeability increases. 3.It is impossible for a blanket of stronger permeability(independent of length)to do as well as that of weaker permeability(with respect to discharge of seepage).Thus the weaker the permeability of blanket,the better and the value of k_0/K_n should be higher than 2000 at least.

本文指出土坝上游用铺盖防渗是一种符合多、快、好、省的方法.本文主要研究了下列问题:1.介绍基础土壤的管涌可能性及其所谓抗渗强度的概念,并讨论它们对设计铺盖长度的影响;2.讨论了经济安全的铺盖长度、厚度及渗流量计算;3.确定斜墙后浸润线的位置及铺盖下等势线的分布.选择最短铺盖长度,主要取决于下面两个条件:1.铺盖下坝基渗透坡降 j_0小于或等于坝基土壤的尤许坡降(以不发生渗透变形为原则);2.单宽渗流量小于或等于允许设计渗流量 (以蓄水水能利用为原则).根据巴夫洛夫斯基的分段法原理及上述原则得到下列计算公式.铺盖长度计算:表示第一个条件的计算公式为(15)式;表示第二个条件的为(14)式.给定了铺盖长度后,渗流量按(18)式计算.铺盖的厚度按(25)式计算.从72个试验资料证实本文所建议的计算公式在目前说来,较其他国内外学者的公式精度高.从理论和试验研究结果可得铺盖防渗的几点重要的概念:1.铺盖的透水性愈小(k_0/k_n≥5000)防渗的效用也就愈大,反之防渗的效用则很小.2.不管铺盖的透水性强与弱都存在着“有效铺盖长度”的概念,即铺盖的长度如大于有效铺盖长度时,它的防渗作用不显著.“有效铺盖长度”是随铺盖的...

本文指出土坝上游用铺盖防渗是一种符合多、快、好、省的方法.本文主要研究了下列问题:1.介绍基础土壤的管涌可能性及其所谓抗渗强度的概念,并讨论它们对设计铺盖长度的影响;2.讨论了经济安全的铺盖长度、厚度及渗流量计算;3.确定斜墙后浸润线的位置及铺盖下等势线的分布.选择最短铺盖长度,主要取决于下面两个条件:1.铺盖下坝基渗透坡降 j_0小于或等于坝基土壤的尤许坡降(以不发生渗透变形为原则);2.单宽渗流量小于或等于允许设计渗流量 (以蓄水水能利用为原则).根据巴夫洛夫斯基的分段法原理及上述原则得到下列计算公式.铺盖长度计算:表示第一个条件的计算公式为(15)式;表示第二个条件的为(14)式.给定了铺盖长度后,渗流量按(18)式计算.铺盖的厚度按(25)式计算.从72个试验资料证实本文所建议的计算公式在目前说来,较其他国内外学者的公式精度高.从理论和试验研究结果可得铺盖防渗的几点重要的概念:1.铺盖的透水性愈小(k_0/k_n≥5000)防渗的效用也就愈大,反之防渗的效用则很小.2.不管铺盖的透水性强与弱都存在着“有效铺盖长度”的概念,即铺盖的长度如大于有效铺盖长度时,它的防渗作用不显著.“有效铺盖长度”是随铺盖的透水性增加而减小.3.想用强透水性的铺盖防渗(不管铺盖怎样长),要达到弱透水性铺盖那样的效果是不可能的(指渗流量的大小而言),因此,铺盖的透水性愈小愈好,k_0/k_n 值最好至少大于2000.

This paper has been prepared as a supplement and rectification to "PreliminaryObservations on Faunal Regions of Termites in Southern Part of China" published by thesame authors in 1957. In the first part of this paper, based on the conceptions of "Quality, Quantity,Time, and Space" to study the subject, an attempt has been made to define tentative-ly the terminology" the Fauna of the Insect". The term is used here to designate the specific forms and number of the insect or-ganism in a certain space at a moment....

This paper has been prepared as a supplement and rectification to "PreliminaryObservations on Faunal Regions of Termites in Southern Part of China" published by thesame authors in 1957. In the first part of this paper, based on the conceptions of "Quality, Quantity,Time, and Space" to study the subject, an attempt has been made to define tentative-ly the terminology" the Fauna of the Insect". The term is used here to designate the specific forms and number of the insect or-ganism in a certain space at a moment. Classifying insects into different Faunal regionsis to give expression to the forms and number within a certain taxonomic unit of variousdimensions by systematic grading, thus showing the identity and particularity of eachother and possibly interpreting the law of their development in course of time. The Faunal Region of Isoptera has been tentatively divided into five grades: 0. Supplemental grade--Kingdom 1. World grade--Region and Sub-region 2. Termo grade--Zone and Sub-Zone 3. Eco-pattern grade--Eco--fauna and sub-ecofauna 4. Domicile grade--Habitat In the second part of the paper, a modified scheme for classifying the Faunal regionsof Isoptera in China is presented. The Isoptera in the above-mentioned district has been classified on the degree ofeco-fauna for the time being with taxomical genera as its basis. And a brief accountof the geographic locations of different eco-faunae, their composition and economic im-portance has been given. The following figure is presented to outline the Faunal regions of Isoptera in China. Finally, the geographic origin of Rhinotermitidae, the distribution characteristics ofMacrotermitinae and the relationships between Isoptera in China and those of other sub-regions of Oriental region are discussed. The newly-proposed central-China sub-region is the one besides the four existing sub-regions, the boundary in the eastern part of China between Palaearctic and Orientalregions is determined to be some where about 35°North latitude.

本文首先以质、量、时、空的概念,为区系加以定义。就等翅目进行了区系的系统等级划分。简述了各区系间的地理位置、种属组成、生态特性和其经济意义。从不同分布地区存在着的物种形式与组成和数量的差异,分析它们和社会主义建设的关系。最后讨论了犀螱科的地理来源,大螱亚科在我国分布的特色及我国南方等翅目区系与其他东洋热带地区等翅目区系的亲缘关系。至于作者等新拟的华中亚区,是东洋区现有四亚区的另一亚区,主张古北区和东洋区在我国东部的分界线约在北纬35度左右。还对等翅目中文定名作了建议。

The Middle Pleistocene microfaunas(foraminifera and ostracoda)from the wes-tern coast of Pohai Gulf are here studied.From the palaeoecological viewpoint,beltsof ecological assemblages may be distinguished geographically,and sequences of eco-logical assemblages may be recognized stratigraphically.Biostratigraphical approa-ches,C~(14)dating and paleomagnetic method have been employed to assess the age ofstratigraphic units,to permit the world-wide correlation and to reconstruct thepaleoclimatology and paleogeography...

The Middle Pleistocene microfaunas(foraminifera and ostracoda)from the wes-tern coast of Pohai Gulf are here studied.From the palaeoecological viewpoint,beltsof ecological assemblages may be distinguished geographically,and sequences of eco-logical assemblages may be recognized stratigraphically.Biostratigraphical approa-ches,C~(14)dating and paleomagnetic method have been employed to assess the age ofstratigraphic units,to permit the world-wide correlation and to reconstruct thepaleoclimatology and paleogeography of this area.

本文对渤海湾西岸几个钻孔岩芯中所含微体古生物(有孔虫、介形类),做了生态和古生态分析。根据生态组合在水平方向上的分布,划分了“生态组合相带”;在地层中垂直方向上的分布,称之为“生态组合层序”。结合古地磁测量及C~(14)年代测定,确定了地层年代,进行了世界性对比,并且恢复了本区古气候、古地理。

 
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