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  effect dominates
     In diaspore flotation using sodiam dodecyl sulfonate, electrostatic effect dominates, with semi micelle adsorption occurring on diaspore surface, and the optimum values for diaspore flotation using sodium dodecyl sulfonate is pH<6 2. In diaspore flotation using sodium oleate, chemisorption of sodium oleate takes place on the diaspore surface.
     用阴离子捕收剂十二烷基磺酸钠和油酸钠浮选一水硬铝石 ,十二烷基磺酸钠与一水硬铝石以静电作用为主 ,并发生半胶束吸附 ,最佳浮选范围为pH <6 2 ;
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     The regressive equation showed: MgSO4·7H2O mainly effected the yield directly, the less was Ca(NO3)2·4H2O, KNO3, NH4H2PO4 by sequent.
     从回归方程可得:MgSO4·7H2O对产量以直接作用为主,其次为Ca(NO3)2·4H2O、KNO3和NH4H2PO4。
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     For the particles with the size of 0.007 mm ≤d< 0.025 mm, the adsorption is predominant when the equilibrium concentration of Benzo(a)pyrene is 0~8.87μg·L -1 in water phase; the partition is predominant when the equilibrium concentration of Benzo(a)pyrene is higher than 8.87μg·L -1 in water phase.
     当苯并(a)芘液相平衡浓度为0~8.87μg·L-1时,其在粒径0.007mm≤d<0.025mm颗粒物上的吸附以表吸附作用为主,当液相平衡浓度大于8.87μg·L-1时,吸附以分配作用为主;
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     CONCLUSION: At the same concentration, p Eph active α 1 and α 2 receptors on anococcygeus muscles in rats with indirect action, but Eph with direct.
     结论 :同等浓度下 ,p Eph以间接作用方式激动大鼠肛尾肌α1和α2 受体而产生正性肌力作用 ,而Eph以直接作用为主
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     FB-1 and FB-2 had promotive effect but FB-3 and FB-4 had suppressive effect mainly.
     从FB中进一步分离得到的FB-1和FB-2以免疫增强作用为主,而FB-3和FB-4则以免疫抑制作用为主
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     It was found that bothα1 andα2-AR (mainlyα1-AR) mediated the contractile response.
     发现在大鼠主动脉中,α1-AR和α2-AR均可介导其收缩效应并以α1-AR的作用为主
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     Our result shows that this stress field is characterized by dominant horizontal or nearly horizontal stress.
     以水平和近水平应力作用为主 ;
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     The cavity filling is the main ore-forming form.
     成矿方式以充填作用为主
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     Affect of Role Intrusion Detection System
     入侵检测系统的作用
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     deterrent function;
     威慑作用;
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     proliferatum was the predominant species.
     proliferatum为主
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  effect dominates
The rate of oxidation of DTBC was more than that of catechol in the presence of both the catalysts signifying that the inductive effect dominates over the steric constraints in this case.
      
Copper clusters: electronic effect dominates over geometric effect
      
If the substitution effect dominates the income effect in labor supply, the domestic supply of labor necessarily decreases in response to an inflow of migrants.
      
The last effect dominates, meaning that the commitment value of capital is negative for all firms.
      
At low values of Brinkman number (Br~0.1), the cooling effect dominates over viscous heating in the entrance region.
      
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Various factors affect the development of headblight of wheat caused by Gibbe-rella zeae (Schw.) Petch under field conditions.The present investigation carriedout in 1955 and 1956 at Nanking,Kiangsu province,was primarily concerned withthe development of spores of the pathogen and the amount of rainfall in relationto disease development.For the purpose of inducing epiphytoties of the disease,asusceptible variety of wheat to headblight was grown in the inoculated plots.Inoculation was made at the surface of the...

Various factors affect the development of headblight of wheat caused by Gibbe-rella zeae (Schw.) Petch under field conditions.The present investigation carriedout in 1955 and 1956 at Nanking,Kiangsu province,was primarily concerned withthe development of spores of the pathogen and the amount of rainfall in relationto disease development.For the purpose of inducing epiphytoties of the disease,asusceptible variety of wheat to headblight was grown in the inoculated plots.Inoculation was made at the surface of the soil with mycelium cultured on wheatgrain shortly after planting,and an "artificial rain" by frequent spray of water tothe plants was supplied after heading.Investigations were made on the develop-ment and dissemination of ascospores and conidia of the pathogen,the seasonaldevelopment of the disease and the meteorological factors involved. Field observations showed that the headblight fungus on the soil surface inthe inoculated plots produced both kinds of spores with ths ascospores much morepredominant than the conidia.Perithecia and mature ascospores could be formedboth in the fall and in next spring through early summer under conditions ofadequate moisture and warm temperature suitable for their development.It wasindicated by trapping the spores in the air that the ascospores produced on thesoil surface were the chief source of inoculum for primary infection although theconidia formed on the infected spikes were equally important in spreading the di-sease in the field later in the season.The frequency and amount of ascosporesand conidia present in the air depended upon the height in spore trapping.Whilespores were found most frequently and most abundantly at a height of 17 cm.above the ground,much less spores were caught at heights of 33 cm.and up to117 cm.There was a tendency to decrease in the amount of spores with theincrease in height.A comparative survey of the spores in the air in the inoculated ??and uninoculated plots indicated that a great majority of spores could not bedisseminated very far from their source of production.This,together with thefact that comparatively more spoies were trapped on raining days,made it rea-sonable to consider splashing rain as the more important agent than wind forspore dissemination. The amount of inoculum existing in the soil and the rainfall were proved tobe the factors of utmost importance for the epiphytotic of the disease.In 1955,the average percentages of headblight for the inoculated plots with and withoutthe spray of water were 29.4 and 13.4% respectively,in comparison with the neigh-bouring fields where only very few infected heads were observed.In 1956,theaverage percentages for headblight in the four experimental plots:(1) inoculatedand sprayed with water,(2) inoculated and not sprayed,(3) uninoculated andsprayed,and (4) uninoculated and not sprayed,were 42.98,42.05,11.91 and6.26%,respectively.In these four corresponding plots,the average percentagesfor culm rot were 4.27,3.89,3.65 and 2.17%.Although there was no significantdifference in the final percentages of both headblight and culm rot between thesprayed and unsprayed plots either with or without inoculation,probably due tothe continuous heavy rain in the latter part of the wheat-growing season,yethigher percentages were always observed in the sprayed plots than in the un-sprayed ones throughout the period of disease development.Under conditions ofabundant inoculum in the soil and heavy rainfall,increase in percentage of head-blight could reach as much as 32% within a period of two days even when theplants were already near maturity.In 1955,a daily average temperature over20℃ was found to be favorable for the development of headblight,but observa-tions made in 1956 did not show significant effect of the temperature on thedevelopment of disease.

1.赤霉病菌在土壤表面的病組織上能产生分生孢子及子囊孢子,而以子囊孢子为??主。子囊孢子在播种后入冬前和入春后都能發生,以春夏季發生較多,冬季發生極少。子囊壳形成的多少与成熟程度决定于气温和土湿,較高的温度和潮湿土壤有利于子囊壳的形成和子囊孢子的成熟. 2.春季在麦株附近空气中出現的病菌孢子,前期以子囊孢子为主,后期子囊孢子和分生孢子都有發生。孢子出現的次数和数量以距离地面0.5尺高度的最多,愈高則愈少;孢子發生的数量在雨天或雨后最多。土壤表面形成的子囊孢子和病穗上产生的分生孢子,其傳播似都以雨水的飞濺作用为主,且大部分孢子的傳播距离并不很远。3.在土壤接菌的情况下,苗腐和基腐病的發生并不严重,更少引起植株死亡的現象。秆腐在1955年發生極少,1956年在大田及試驗区內都很普遍。4.土壤內病菌量和雨湿的多少是影响穗腐和秆腐的主要因素,而前者更为重要。在土壤接种喷水、接种不噴水、不接种噴水和不接种不喷水4区,穗腐率分別为42.98,42.05,11.91及6.26%,秆腐率分別为4.27,3.89,3.65及2.17%。5.大量的病菌孢子和連續降雨是促成病害迅速發展的主要条件。20℃以上的日平均温度...

1.赤霉病菌在土壤表面的病組織上能产生分生孢子及子囊孢子,而以子囊孢子为??主。子囊孢子在播种后入冬前和入春后都能發生,以春夏季發生較多,冬季發生極少。子囊壳形成的多少与成熟程度决定于气温和土湿,較高的温度和潮湿土壤有利于子囊壳的形成和子囊孢子的成熟. 2.春季在麦株附近空气中出現的病菌孢子,前期以子囊孢子为主,后期子囊孢子和分生孢子都有發生。孢子出現的次数和数量以距离地面0.5尺高度的最多,愈高則愈少;孢子發生的数量在雨天或雨后最多。土壤表面形成的子囊孢子和病穗上产生的分生孢子,其傳播似都以雨水的飞濺作用为主,且大部分孢子的傳播距离并不很远。3.在土壤接菌的情况下,苗腐和基腐病的發生并不严重,更少引起植株死亡的現象。秆腐在1955年發生極少,1956年在大田及試驗区內都很普遍。4.土壤內病菌量和雨湿的多少是影响穗腐和秆腐的主要因素,而前者更为重要。在土壤接种喷水、接种不噴水、不接种噴水和不接种不喷水4区,穗腐率分別为42.98,42.05,11.91及6.26%,秆腐率分別为4.27,3.89,3.65及2.17%。5.大量的病菌孢子和連續降雨是促成病害迅速發展的主要条件。20℃以上的日平均温度似有利于病害的發展,但兩年的結果不很一致,可能由于其他因子的影响。

1 7—18% 1 80% 1 <0.25 1—0.5 7—32%.43%, 26%.~~

贛中丘陵地区红壤性水稻土分布面积很广,但由于所处的地形部位不同及人类耕作措施各异,各类红壤性水稻土的肥力水平有很大差异。影响土壤肥力水平有两个方面:卽土壤既能滿足作物生长过程所需的水分和养分,又能使作物有良好的“居住环境”,而土壤的物理性质对保証作物良好的居住环境起有决定的作用。研究土壤的结构、各结构体内的孔隙状况以及結构胶結物貭的种类和数量,对认識土壤物理性貭在提高肥力上的作用具有很大意义。根据我們初步的研究結果,紅壤性水稻土中,水稳性結构大于1毫米粒級的結构体,含量較少,一般仅占总数的7—18%,小于1毫米的占80%以上。在小于1毫米的各粒級中,除<0.25毫米粒級占絕对优势外,1—0.5毫米的粒級占7—32%,肥土(烏泥田)中1—0.5毫米粒級的含量較高。不同土壤的結构体,由于其内部的孔隙状况不一,土壤肥沃度也各有异。肥土結构体内的总孔隙度高达43%,而瘠土(結板田)只26%。如按相同粒級結构体内的孔隙相比也是肥土中高而瘠土中低。在这个地区土壤結构体内孔隙的形成,主要取决于結构胶結物貭的种类和数量以及微凝聚体的排列形式。一般的說,如果胶結物貭以无定形R_2O_3或多量粘粒的接触作用为主,則結...

贛中丘陵地区红壤性水稻土分布面积很广,但由于所处的地形部位不同及人类耕作措施各异,各类红壤性水稻土的肥力水平有很大差异。影响土壤肥力水平有两个方面:卽土壤既能滿足作物生长过程所需的水分和养分,又能使作物有良好的“居住环境”,而土壤的物理性质对保証作物良好的居住环境起有决定的作用。研究土壤的结构、各结构体内的孔隙状况以及結构胶結物貭的种类和数量,对认識土壤物理性貭在提高肥力上的作用具有很大意义。根据我們初步的研究結果,紅壤性水稻土中,水稳性結构大于1毫米粒級的結构体,含量較少,一般仅占总数的7—18%,小于1毫米的占80%以上。在小于1毫米的各粒級中,除<0.25毫米粒級占絕对优势外,1—0.5毫米的粒級占7—32%,肥土(烏泥田)中1—0.5毫米粒級的含量較高。不同土壤的結构体,由于其内部的孔隙状况不一,土壤肥沃度也各有异。肥土結构体内的总孔隙度高达43%,而瘠土(結板田)只26%。如按相同粒級結构体内的孔隙相比也是肥土中高而瘠土中低。在这个地区土壤結构体内孔隙的形成,主要取决于結构胶結物貭的种类和数量以及微凝聚体的排列形式。一般的說,如果胶結物貭以无定形R_2O_3或多量粘粒的接触作用为主,則結构体內部的孔隙度較小(如紅瓖母貭)。肥沃的紅壤性水稻土中,結构体的胶結物貭以有机貭起主导作用及顆粒大小不均一,使結构体內部的孔隙度較大。由于胶結物貭的种类和数量不一,有机、无机胶体的复合类型也不同,因而使肥土中的結构体不仅具有水稳性,而且还是多孔性的。只有这种結构体才能調节和滿足作物生长所需的土壤环境,才能形成肥沃的土壤。

This paper deals with the variations of tectonic stress in the region around Beijing and Tianjin before the great Tangshan Earthquake of 1976, based on the analysis of the continuously recorded data of over 400 small earthquakes occurred during the last 20 years. Such variations are chiefly concerned with the horizontal stress, indicating compression in the east-west direction and extension in the north-south. It is essentially consistent with the results from the earthquake source mechanism solution and the...

This paper deals with the variations of tectonic stress in the region around Beijing and Tianjin before the great Tangshan Earthquake of 1976, based on the analysis of the continuously recorded data of over 400 small earthquakes occurred during the last 20 years. Such variations are chiefly concerned with the horizontal stress, indicating compression in the east-west direction and extension in the north-south. It is essentially consistent with the results from the earthquake source mechanism solution and the results of field macroscopic observations of the main Tangshan earthquake. The variations lasted for four and half years and recovered to the original state after the great earthquake.Through an analysis of the stress variations, the spatial distribution of the seismic activity of small earthquakes of M≥3.0 occurred in this region and their source mechanism solutions, the relation between the stress concentration and the fault activity before the Tangshan Earthquake has been discussed. It can be shown that before the earthquake the strain energy was concentrated at the northern end of the cangdong fault belt and it was released for the first time during the last several decades which reflects the background for the occurrence of the Tangshan Earthquake.

本文根据近二十年来400多次地震的连续资料,分析了北京、天津周围地区在1976年唐山强震发生前的应力变化。其特征是以水平应力作用为主,表现为东西受挤压,南北受引张.与唐山主震震源机制解结果和野外宏观考察结果基本一致.变化持续时间达四年半之久,并于强震发生后又恢复到原有状态.通过对此地区应力变化过程与震前3级以上地震空间活动及其震源机制的分析,进一步探讨了唐山强震前后应力集中和断层活动的关系.发现震前应变能集中于沧东断裂北端,其释放是近几十年来的第一次.反映了唐山强震的发生背景.

 
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