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population     
相关语句
  种群
    STUDY ON POPULATION ECOLOGY OF ZOYSIA JAPONICA
    结缕草种群生态的研究
短句来源
    Study on the ecology and genetic structure of Larix chinensis population
    太白红杉种群生态及遗传结构研究
短句来源
    Study on the Population Ecology of the Dey Euphausiid Species in the Waters off China Coast and in the Southern Ocean
    中国近海及南大洋磷虾关键种种群生态学研究
短句来源
    Studies on Population Ecology of Several Plants in the Northeast China's Oligotrophic Mires
    东北贫营养泥炭沼泽几种植物的种群生态学研究
短句来源
    The Application of Impulsive Differential Equations in Mathematical Modelling of Population Ecology Management
    脉冲微分方程在种群生态管理数学模型研究中的应用
短句来源
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  群体
    Research on the Informatics Model of Population Genetic Variation
    群体遗传变异的信息学模型研究
短句来源
    Population Genetic Study on Small Captive Population of Amur Tigers(Panthera tigris altica)
    东北虎(Panthera tigris altica)圈养小群体群体遗传学研究
短句来源
    Study on the Population Genetics of Bay Scallop Argopecten Irradians and the Molecular Phylogeny of Pectinidae
    海湾扇贝群体遗传学和扇贝科分子系统演化的研究
短句来源
    The Study of Heterogeneity Theory and Quantitative Analysis Method of the Human Population Spatial Genetic Structure
    人类群体遗传空间结构异质性理论与定量分析方法研究
短句来源
    Studies on the Molecular Phylogeny and Molecular Population Genetics of the Slow Lorises (Genus Nycticebus)
    蜂猴属的分子系统发育及分子群体遗传学研究
短句来源
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  居群
    THE APPLICATION OF THE CONCEPT AND METHOD OF POPULATION TO PLANT TAXONOMY
    居群(population)概念和方法在植物分类学中的应用
短句来源
    POPULATION DYNAMICS OF DALMANELLA TESTUDINARIA AND DORYTRETA LONGICRURA (BRACHIOPODS) OF LATE ORDOVICIAN HIRNANTIA FAUNA FROM NORTHWESTERN GUIZHOU, SW CHINA
    黔西北晚奥陶世Dalmanella testudinaria及Dorytreta longicrura(腕足类)居群动态学研究
短句来源
    45 nucleotide sequences of the clones derived from CHN9230-F3-Ⅱ could be divided into 3 groups in the phylogenetic tree base on VP1 gene homology,forming a viral mutant population with a few preponderant sequences,and this was the so called typical quasispecies.
    45条序列在同源进化树图上分为3组,但都来源于CHN9230-F3-Ⅱ株,组成以优势株为主的相关突变株的病毒群,是典型的居群样存在形式。
短句来源
    RAPD Analysis of Genetic Diversity in the Natural Population of Metasequoia glyptostroboides, Central China
    水杉自然居群遗传多样性的RAPD研究
短句来源
    RAPD Analysis of Different Population of Dacydium pierrei
    陆均松不同居群的RAPD分析
短句来源
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  种群数量
    THE THEORETICAL AND LABORATORY STUDIES OF ANIMAL POPULATION DYNAMICS Ⅱ. A STUDY OF INNATE CAPACITY FOR INCREASE (r_m) OF TRIBOLIUM CONFUSUM (H.) UNDER CERTAIN EXPERIMENTAL CONDITIONS
    动物种群数量变动的理论与试验研究 Ⅱ.杂拟谷盗 Tribolium confusum(H.)的内禀增长能力(r_m)的研究
短句来源
    THE RHESUS MONKEY (MACACA MULATTA) POPULATION DYNAMIC AND DISTRIBUTION AT NANWAN PENINSULA OF HAINAN ISLAND
    海南岛南湾半岛猕猴(Macaca mulatta)种群数量动态及分布
短句来源
    STUDY ON SPECIES,DOMINANT OF MICRYPHANTID SPIDERS AND ITS POPULATION QUANTITIES IN PADDY FIELD
    稻田微蛛种类与优势种及其种群数量研究
短句来源
    A Study on the Mathematical Models of Population Dynamic on the Prairie Grasshoppers
    草地蝗虫种群数量消长数学模型研究
短句来源
    A REVIEW OF THE RELATIONSHIP BETWEEN CITY CONSTRUCTION AND POPULATION CHANGE OF TERMITES
    我国城市建设与白蚁种群变化、种群数量变动关系综述
短句来源
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  population
On the differentiability of the parity progressive population semigroup
      
We are concerned with the differentiability of the parity progressive population semigroup under certain weak assumptions.
      
We prove by studying the properties of the spectrum of the parity progressive operator of population that there existst0>amp;gt;0 such that the parity progressive population semigroup {T(t): t≥0} is differentiable ift>amp;gt;t0
      
In this paper, we present a simple and direct approach in which supermartinagles are used to approximate the optimal stopping sets associated with the Bayesian sequential test for normal population means.
      
For von Mises population M(μ,k), we find that six bootstrap confidence intervals are second-order correct like the approximate normal confidence interval, and STUD-interval is third-order correct.
      
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In connection with experiments on the control of the rice stem borer, aseries of observations were conducted in 1949 to 1952 in Canton to determinethe form of the distribution of the moth, the egg-mass and the larval popula-tions of this species. It was found that the moth and egg-mass populations inrice seed-beds are in essential agreement with the random distribution of thePoisson series. The larval population in spring-crop fields apparently conformsto the contagious and the negative binomial...

In connection with experiments on the control of the rice stem borer, aseries of observations were conducted in 1949 to 1952 in Canton to determinethe form of the distribution of the moth, the egg-mass and the larval popula-tions of this species. It was found that the moth and egg-mass populations inrice seed-beds are in essential agreement with the random distribution of thePoisson series. The larval population in spring-crop fields apparently conformsto the contagious and the negative binomial distributions. The larval population during hibernation period appears to be neither of the random distribution norof the contagious type but agrees with the negative binomial distribution. The population distribution of the injured stems, characterized by the ap-pearance of "dead-hearts" and "white ears" was also studied. The "dead-hearts"popolation in autumn-crop fields conforms with the contagious and the negativebinomial distribution. The distribution of the "white ears" is not at random. It iseither in essential agreement with the contagious or with the negative binomialdistribution, depending on the size of the sampling unit. Based on the form of population distribution the questions of sampling tech-nique, the design of field experiments, the transformation of data for statisticalanalysis, as well as the habits and control of insects have been discussed inrelation to the rice stem borer. Since the populations of larvae and "whiteears" differ significantly from the random distribution, a new technique forsampling has been proposed. It is hoped that this may be useful in the investi-gations on the relative effectiveness of control operations and for census purposes.

(一)本文就昆虫常见的数种集团分布:潘松分布、核心分布和负二项式分布的公式、性质和例子等略加讨论介绍。 (二)我们在广州附近对三化螟各时期和白穗、枯心苗的田间分布型式作了初步的调查,所得结果如下: 1.螟蛾和卵块在秧田上是随机分布的。 2.幼虫在本田分布不随机,符合核心分布和负二项式分布。 3.白穗在田间的分布不随机,1×1丛、2×2丛、……6×6丛各种取样单位型样本均符合负二项式分布,4×4丛、5×5丛和6×6丛三种取样单位型样本则更符合核心分布。 4.稻遗株内越冬幼虫分布不随机,亦不符合核心分布,但符合负二项式分布。 5.晚造本田枯心苗田间分布不随机,符合核心分布和负二项式分布。 (三)本文就昆虫集团分布型式的调查在实用上的意义,联系到三化螟来讨论,我们论及与虫害调查取样技术、田间试验设计、统计代换方法、昆虫生活习性和害虫防治等各方面的关系;其中取样技术方面,我们举出针对三化螟幼虫在本田和白穗不随机分布的取样新方法的尝试,希望对今后螟害调查工作有所帮助。 (四)最后,我们就一些昆虫分布的特殊问题加以论列,像密度对分布型式的影响,混合集团和环境因素的影响于昆虫集团分布类型等,就中说明了密度过大过 小时了解分...

(一)本文就昆虫常见的数种集团分布:潘松分布、核心分布和负二项式分布的公式、性质和例子等略加讨论介绍。 (二)我们在广州附近对三化螟各时期和白穗、枯心苗的田间分布型式作了初步的调查,所得结果如下: 1.螟蛾和卵块在秧田上是随机分布的。 2.幼虫在本田分布不随机,符合核心分布和负二项式分布。 3.白穗在田间的分布不随机,1×1丛、2×2丛、……6×6丛各种取样单位型样本均符合负二项式分布,4×4丛、5×5丛和6×6丛三种取样单位型样本则更符合核心分布。 4.稻遗株内越冬幼虫分布不随机,亦不符合核心分布,但符合负二项式分布。 5.晚造本田枯心苗田间分布不随机,符合核心分布和负二项式分布。 (三)本文就昆虫集团分布型式的调查在实用上的意义,联系到三化螟来讨论,我们论及与虫害调查取样技术、田间试验设计、统计代换方法、昆虫生活习性和害虫防治等各方面的关系;其中取样技术方面,我们举出针对三化螟幼虫在本田和白穗不随机分布的取样新方法的尝试,希望对今后螟害调查工作有所帮助。 (四)最后,我们就一些昆虫分布的特殊问题加以论列,像密度对分布型式的影响,混合集团和环境因素的影响于昆虫集团分布类型等,就中说明了密度过大过 小时了解分布型式成为不必要的,因为极度的不均衡会回复为均衡状态的。

The present paper reports on the results of some preliminary observationson the insect parasites of the pine caterpillar, carried out in the Nanking dis-trict during 1936-37. (1) The following insect parasites were reared from various stages of thepine caterpillar: Egg parasites: Trichogramma evanescens Westwood, Telenomus dendrolimusiChu, Anastatus gastropachae Ashmead. Larva parasites: Casinaria dendrolimi Uchida, Rhogas spectabilis (Matsumura),Stenaraeoides octocinctus (Ashmead), Itoplectis nigribasalis Uchida,...

The present paper reports on the results of some preliminary observationson the insect parasites of the pine caterpillar, carried out in the Nanking dis-trict during 1936-37. (1) The following insect parasites were reared from various stages of thepine caterpillar: Egg parasites: Trichogramma evanescens Westwood, Telenomus dendrolimusiChu, Anastatus gastropachae Ashmead. Larva parasites: Casinaria dendrolimi Uchida, Rhogas spectabilis (Matsumura),Stenaraeoides octocinctus (Ashmead), Itoplectis nigribasalis Uchida, Tricholygasorbillans Wied., Sturmia sp., Carcelia sp. Pupal parasites: Xanthopimpla japonica Krieger, Pimpla disparis Viereck,Brachymaria obscurata (Walker), Brachymeria fiskei Crawford. Hyperparasites: Phygadeuon latipatiolator Uchida, Monodontomerus dentipes(Boheman), Brachymeria obscurata (Walker), Brachymeria fishei Crawford, Eury-toma sp. (2) The egg parasites played an important part in the natural control ofthe pine caterpillar. The percentage of parasitism reached 61% in the materialcollected at Tang-shan, 1936. Telenomus dendrolimusi and Anastatus gastropachaewere observed to be more important than Trichogramma evanescens. (3) As high as 26% of the early-instar larvae could be killed by the para-sites. The percentage of larval parasitism and the relative value of the severalparasites varied with the time at which host material was collected. A differ-ence of a few days would give entirely different results. (4) The late-instar larvae were attacked by three species of dipterousparasites. The highest percentage of parasitism observed was 42%. (5) 38.4% of the pine caterpillar were killed during their pre-papal andpupal stage chiefly by Sturmia sp. and Xanthopimpla japonica Krieger. (6) The percentage of parasitism whether in the egg, larva or pupa stagewere observed to be always higher in the second generation than in the first,a fact suggests that hibernation may have an important bearing upon thepopulation of the parasites. (7) The time of appearance of the more important parasites and theirhabits were discussed. (8) Some of the factors, such as hyperparasitism, non-synchronization ofthe life cycles of the host and parasite, over-restriction in host selection, andthe influence of certain control measures, which have adverse effects on theparasite populations, were discussed. (9) As the percentage of parasitisn fluctuated greatly with year and season,it, is, therefore, suggested that a study of the factors which are responsible forthese fluctuations is of primary importance. Based on the results of suchstudies, measures may be adopted to increase the efficiency of the parasites.

1936—37年在南京地区观察松毛虫寄生天敌所得的初步结果可简述如下: (一)南京地区业经发现的松毛虫天敌有卵寄生蜂3种:赤眼卵蜂、松毛虫长腹卵蜂、平腹小蜂;幼虫寄生蜂4种:松毛虫瘦姬蜂、松与虫红头小茧蜂、花胸姬蜂、黑基瘤姬蜂;幼虫寄生蝇3种:家蚕寄生蝇、大寄生蝇、小寄生蝇;蛹寄生蜂4种;日本黑点姬蜂、黑瘤姬蜂、大腿蜂、费氏大腿蜂;另重寄生8种。 (二)卵寄生蜂在防治松毛虫上起了适当大的作用,有时减低寄主虫口达61.24%。3种寄生蜂中以松与虫长腹卵蜂及平腹小峰为较重要。 (三)松毛虫初龄幼虫寄生率最高时可达26%。寄生率的高低及各种天敌的比较重要性与采集寄主材料的时期有密切的关系,往往数日之差,寄生率可截然不同。 (四)松与虫的后龄幼虫遭3种寄生蝇的寄生。寄生率最高可达42%。 (五)松毛虫茧期的寄生率可达38.4%,天敌中以大寄生蝇及日本黑点姬蜂为 最主要。 (六)无论在卵期、幼虫期或蛹期,第2化松毛虫的寄生率均比第1化的为高。此点似说明越冬问题是松毛虫天敌繁殖中的一个关系问题。 (七)几种比较重要的寄生天敌的发生时期和生活习性,本文中根据观察所及,加以记载。 (八)本文中将几个影响松毛虫寄生天敌虫口的因...

1936—37年在南京地区观察松毛虫寄生天敌所得的初步结果可简述如下: (一)南京地区业经发现的松毛虫天敌有卵寄生蜂3种:赤眼卵蜂、松毛虫长腹卵蜂、平腹小蜂;幼虫寄生蜂4种:松毛虫瘦姬蜂、松与虫红头小茧蜂、花胸姬蜂、黑基瘤姬蜂;幼虫寄生蝇3种:家蚕寄生蝇、大寄生蝇、小寄生蝇;蛹寄生蜂4种;日本黑点姬蜂、黑瘤姬蜂、大腿蜂、费氏大腿蜂;另重寄生8种。 (二)卵寄生蜂在防治松毛虫上起了适当大的作用,有时减低寄主虫口达61.24%。3种寄生蜂中以松与虫长腹卵蜂及平腹小峰为较重要。 (三)松毛虫初龄幼虫寄生率最高时可达26%。寄生率的高低及各种天敌的比较重要性与采集寄主材料的时期有密切的关系,往往数日之差,寄生率可截然不同。 (四)松与虫的后龄幼虫遭3种寄生蝇的寄生。寄生率最高可达42%。 (五)松毛虫茧期的寄生率可达38.4%,天敌中以大寄生蝇及日本黑点姬蜂为 最主要。 (六)无论在卵期、幼虫期或蛹期,第2化松毛虫的寄生率均比第1化的为高。此点似说明越冬问题是松毛虫天敌繁殖中的一个关系问题。 (七)几种比较重要的寄生天敌的发生时期和生活习性,本文中根据观察所及,加以记载。 (八)本文中将几个影响松毛虫寄生天敌虫口的因子提出讨论,这些因子包括;重寄生的严重、天敌发生时期与寄主生活史的不相

Precipitation, either in amount or in distribution, exerts a definite regulatory influence on thenumerical increaces of the locust. In the Hwai Valley, the rainfall is generally concentrated withinthe months of July and August, leaving the lowlands exposed for the rest of the year. This makesthe area favourable to locust multiplication. A forward or backward shift of the rainy period willaffect the locust population, for instance, in the former case, the embryonic development of thesummer generation eggs...

Precipitation, either in amount or in distribution, exerts a definite regulatory influence on thenumerical increaces of the locust. In the Hwai Valley, the rainfall is generally concentrated withinthe months of July and August, leaving the lowlands exposed for the rest of the year. This makesthe area favourable to locust multiplication. A forward or backward shift of the rainy period willaffect the locust population, for instance, in the former case, the embryonic development of thesummer generation eggs will be seriously interfered with, while in the latter case, both the summerand the fall generations of locusts will be favourably affected. It is advocated that locust control should not be limited to insecticide applications, measuressuch as irrigation, rotation and cultivation should also be taken into consideration. Only when a comprehensive control program has been carried out, will the control be thorough and lasting.

本文根据沿淮蝗区的历史情况、饲养观察、气象、水文等资料,加以整理与分析: 1.从产蝗基地形成的过程中,阐明飞蝗生态特性与水涝之间的联系,从而了解飞蝗消长规律是由这种联系内在矛盾和统一的更替影响的结果。 2.雨水对飞蝗发生有一定的控制作用,故雨量的多寡与雨量的分布具有飞蝗生态上的重大意义: (1)淮河流域雨量适中,全年雨量集中在7、8两月,雨期短,湖滩洼地暴露时间长,故 宜飞蝗生长繁殖,同时该蝗区雨量较多,加之年雨量变幅大(年雨量相对变率超出25%以上,接近30%),及淮河水流平缓吐洩困难等原因,故而有大水涝灾发生,对飞蝗繁殖有很大的限制。 (2)雨期推移与蝗虫的盛衰是有直接的联系:(i)全年雨量表现在两个高峯以上,即夏秋蝗蝗卵发育及孵化时间多雨,蝗卵的死亡淘汰高,蝗情在雨量控制下基本不能猖撅成灾。(ii)雨期提前即夏蝗在卵的发育后期和孵化期遭高雨量的影响淘汰,以及秋蝗受高水位的影响不得大量发生。(iii)雨期移至7月份正值夏蝗成虫活动和秋蝗孵化的交错时期,对蝗情影响程度须视雨期前后、雨量大小而定。(iv)雨期后移至8月,即夏季季尾雨量一般较少,水情不大,而利于夏蝗发生,对秋蝗影响也少,往往在这种情况下,造成蝗...

本文根据沿淮蝗区的历史情况、饲养观察、气象、水文等资料,加以整理与分析: 1.从产蝗基地形成的过程中,阐明飞蝗生态特性与水涝之间的联系,从而了解飞蝗消长规律是由这种联系内在矛盾和统一的更替影响的结果。 2.雨水对飞蝗发生有一定的控制作用,故雨量的多寡与雨量的分布具有飞蝗生态上的重大意义: (1)淮河流域雨量适中,全年雨量集中在7、8两月,雨期短,湖滩洼地暴露时间长,故 宜飞蝗生长繁殖,同时该蝗区雨量较多,加之年雨量变幅大(年雨量相对变率超出25%以上,接近30%),及淮河水流平缓吐洩困难等原因,故而有大水涝灾发生,对飞蝗繁殖有很大的限制。 (2)雨期推移与蝗虫的盛衰是有直接的联系:(i)全年雨量表现在两个高峯以上,即夏秋蝗蝗卵发育及孵化时间多雨,蝗卵的死亡淘汰高,蝗情在雨量控制下基本不能猖撅成灾。(ii)雨期提前即夏蝗在卵的发育后期和孵化期遭高雨量的影响淘汰,以及秋蝗受高水位的影响不得大量发生。(iii)雨期移至7月份正值夏蝗成虫活动和秋蝗孵化的交错时期,对蝗情影响程度须视雨期前后、雨量大小而定。(iv)雨期后移至8月,即夏季季尾雨量一般较少,水情不大,而利于夏蝗发生,对秋蝗影响也少,往往在这种情况下,造成蝗虫大量的发生。 (3)雨水对蝗卵发育后期及孵化期有严重的影响,不仅是引起?

 
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