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Among several models, one model has been identified with the statistical criteria r≥0.9, chance>amp;lt;0.02, superimposition match>amp;gt;0.67.


Among the several pharmocophore models, the best model had R2 = 0.69, chance = 0.09, size = 3, match = 0.68.


1) for R isomers with correlation coefficient r =0.9, chance= 0.05 and match= 0.47 has four biophoric sites and three secondary sites while the best model for S isomers (model no.


2) with correlation coefficient r =0.86, chance =0.01 and match = 0.45 has three biophoric sites and two secondary sites.


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 Pseudosasa amabilis (McCl.) Keng f.,the Tonkin Cane,is a famous exported bamboo.The present paper deals with both variations in the mean fibrelengths between the internodes and the distribution of fibrelengths within the plant of threeyearold culm. All the macerated materials were selected from the outer part,i.e.,adjacent to the epidermis, the middle part and the inner part,respectively.These were taken from the middle of an inter node along its diameter.Each part was consisted of two matchsized... Pseudosasa amabilis (McCl.) Keng f.,the Tonkin Cane,is a famous exported bamboo.The present paper deals with both variations in the mean fibrelengths between the internodes and the distribution of fibrelengths within the plant of threeyearold culm. All the macerated materials were selected from the outer part,i.e.,adjacent to the epidermis, the middle part and the inner part,respectively.These were taken from the middle of an inter node along its diameter.Each part was consisted of two matchsized sticks,and was macerated and mounted on a slide.Total 615 slides were made.They were supplied from 205 internodes of 9 culms which had been collected from two slopes of the native place (Table 1).A report of the habitat of this Bamboo was quoted. The length of fibre was measured by projection with the aid of a graduated circular target (Fig.1;).All measurements and calculations were separated in regard to both different inter nodes and parts. After studying the lengths of 24300 fibres which are distributed to the three parts from the Znd to the 19th internodes(Tables 2—5;Figs.2—3),some facts may be concluded as follows: 1)That the mean fibrelengths between the internodes increase with the order of the internode upwards from the ground.When the fibre reaches its maximum length,it decreases its length with the internode order upwards further. According to the result of calculation,the increases of mean fibrelengths of different parts from the 2nd to the 5th internodes generally are apparent.Before a given internode (i.e.,fibres of the outer part is at the 10th internode,those of the middle the 11th,and those of the inner the 13th),fibrelength tends to (or comparatively) increase wavely (or gradually).After this inter node,the length tends to decrease,commonly wavely.However,fibrelength may slightly increase in the 17th internode.Beyond this internode,the length generally decreases apparendy.(Tables 2—3;Fig.2.) 2)That the increase or decrease of the length of an internode is similar to that of the fibre length,ie.,it varies with the order of the internode upwards.In other words,the increases of the internode lengths from the 2nd to the 5th internodes are correspondingly apparent.Next,the internode length gradually increases.After the 13th internode,the length decreases gradually. 3)That the variation in the fibrelength of the inner part comparatively is more similar to the variation in the length of the internode.This relation between fibrelength and internodelength seems not so closely as in the case of the fibrelength of the outer part,and,in terms,of the middle part.(Table 5.) 4)That the mean fibrelength of the outer part is longer than that of the middle and that of the inner.(i.e.,1995±25μ,1858±29μ,and 1687±27μ,respeetively.)Between the order of internodes,the increase or decrease of fibrelength of the outer part is more typical than the pheno mena present in the middle and the inner parts (Fig.2). 5)That both variations in the diameter of an internode (here it is expressed as the diameter of the ring which taken from the lniddle of the internode) and in the thickness of the internode (here expressed as the wall thickness of the same ring) decrease with the order of the internode upwards.(Fig.2.) 6)That,therefore,the increase and decrease of the mean fibrelengths of different parts are affected by the factor of the internode length.And 7)That the distribution of fibrelengths of threeyearold culm of Pseudosasa amabilis along the radii of the middle of the internodes examined,the fibres of the outer part are the longest,(1998± 445μ);those of the inner are the shortest,(1675±401μ);while those of the middle are the inter mediate,(1851±409μ).(Table 4;Fig.3.)  青篱竹的三年生纤维长度的变化,从9条竹子(2个坡向,3个地形)的第2至第19节间的中央位置,分别以投影方法量度外部、中部和内部纤维,共计24300条,其结果概括如次:平均纤维长度系随节间顺序的上升而增加,当长度达相当程度时,则随节间顺序的上升而减少。节间长度的增加和下降,它和纤维长度一样,系随节间顺序的上升而变化。内部纤维长度的变化更类似于节间长度的变化。外部纤维的平均长度比中部的和内部的长些,至其中误差对中数的关系也较小。关于竹环直径和竹环壁厚的变化情形,是随节间顺序的上升而减少的。所以,不同部分的平均纤维长度的增加和减少,是受节间长度的影响的。最后,三年生青篱竹的纤维长度的分配,在节间中央的横切面上,外部纤维较长(1998±445微米),内部纤维较短(1675±401微米),而中部纤维则在二者之间(1851±409微米)。  The results presented in this paper may be classified into three categories. First, there is derived the characteristics of gain, bandwidth, and figure of merit of a nondegenerative parametric amplifier of both fundamental and subharmonic pumping; and the comparison between them is carried out in substantial detail. Second, there is devised an analytical method for determining the harmonic contents of the capacitance of a nonlinear semiconductor diode, which is negatively biased and is under the action of... The results presented in this paper may be classified into three categories. First, there is derived the characteristics of gain, bandwidth, and figure of merit of a nondegenerative parametric amplifier of both fundamental and subharmonic pumping; and the comparison between them is carried out in substantial detail. Second, there is devised an analytical method for determining the harmonic contents of the capacitance of a nonlinear semiconductor diode, which is negatively biased and is under the action of a strong high frequency pumping voltage. The magnitudes of bias and pumping voltage are thus found quantitatively. Also, the stability requirements for pumping amplitude and pumping frequency are discussed. Third, the noise figure of a parametric amplifier itself and the effective noise figure of the amplifier loaded with a noisy second stage, which may be a frequency converter, are derived. Factors such as diode loss, match, and the bandwidth ratio of the signal to the idler circuit are all considered in the derivations so as to make the results with greater importance for practical applications. Finally, a numerical example is given to show the utility of the results presented in this paper and to illustrate a possible design procedure of a nondegenerative parametric amplifier.  本文主要结果有三:第一,推导出基波激励和次谐波激励参量放大器的优值、功率增益、和通带等主要特性,并就这些特性对基波激励源的和次谐波激励源的参量放大器进行比较;第二,通过半导体二极管非线性电容的谐波分量的分析,在激励电压、偏压和放大器的特性间得出定量关系,并且对给定放大器特性求出激励源幅度和频率的稳定要求;第三,推导出放大器的有效噪声,并给出最低有效噪声的设计条件。 以上特性的探讨和二极管损耗、信号迴路和镜象迴路通带比、匹配等因子结合在一起进行,使所得结果更具有实际意义。最后举出一数字例子,说明应用本文结果来设计参量放大器的一种可能步骤。  Field evaluation of some newly developed organophosphorus aphicidesacaricides foraphicidal and acaricidal effectiveness was conducted during 19601961 in Peking.Two speciesof aphids(Aphis gossypii Glover,Myzus persicae Sulz.)and two species of mites(Tetranychustelarius L.,Tetranychus viennensis Zacher)were tested mainly by randomized block methodwith three replicates.The following results were obtained.1.Dimethoate[0,0dimethyl S(Nmethylcarbamoylmethyl)dithiophosphate]possessedhigh aphicidal and acaricidal... Field evaluation of some newly developed organophosphorus aphicidesacaricides foraphicidal and acaricidal effectiveness was conducted during 19601961 in Peking.Two speciesof aphids(Aphis gossypii Glover,Myzus persicae Sulz.)and two species of mites(Tetranychustelarius L.,Tetranychus viennensis Zacher)were tested mainly by randomized block methodwith three replicates.The following results were obtained.1.Dimethoate[0,0dimethyl S(Nmethylcarbamoylmethyl)dithiophosphate]possessedhigh aphicidal and acaricidal effectiveness towards both the aphid and both the red spider mitespecies.Both the initial and residual aphicidalacaricidal effectiveness were equal or superiorto those of Demeton.As Dimethoate possesses outstanding features of high aphicidal andacaricidal effectiveness with moderate persistence and low mammalian toxicity,it is consideredto be especially suitable for controlling pests on fruit and vegetable crops.2.The aphicidal effectiveness of Malathion against cotton aphids was quite satisfactory,but was comparatively lower than that of Dimethoate.Its acaricidal effectiveness was not longlasting.3.The acaricidal effectiveness of crude Trithion[0,0diethyl S(4Chlorophenylthiomethyl)dithiophosphate]preparations was prominent.Its initial and residual effectiveness against thetwospotted spider mites was found to be equal or superior to that of Demeton,and was considerably superior to that of Demetonmethyl and Malathion.In addition,its initial and residual effectiveness towards Tetranychus viennensis can also match that of Demeton.Trithionappears to be a promising nonsystemic acaricide.4.The high acaricidal effectiveness of AC3741[0,0diethyl S(carbamoylmethl)dithiophosphate]deserves attention.Preliminary field plot test showed that its acaricidal effectiveness against the twospotted spider mites was significantly superior to that of Demetonmethyland Malathion,while its residual acaricidal effectiveness was also satisfactory.  1960—1961年在北京对棉蚜、桃蚜、棉红蜘蛛及山楂红蜘蛛进行的田间药效试验表明:(1)乐果对两种蚜虫及两种红蜘蛛的速效或残效均接近或超过E1059,在食用作物上的残毒期较短(7日),使用范围也较广。(2)马拉硫磷的杀蚜效力也较好,但不如乐果,杀螨效力不强。(3)三硫磷粗制原油的杀螨效力很突出:对棉红蜘蛛的速、残效接近或超出 E1059,显著超过甲基 E1059和马拉硫磷;对山楂红蜘蛛的速、残效也接近 E1059,对两种红蜘蛛的残效都比较持久,但杀蚜效力较差,远不如乐果。(4)AC3741也具有高度的杀螨效力,对棉红蜘蛛的毒杀效力超出甲基 E1059和马拉硫磷,残效也较好。   << 更多相关文摘 
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