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三个     
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  three
     Establishing the Genetic Transformation System of Tremella Fuciformis and Applying to Transformation Three Quality Character Genes
     银耳遗传转化系统的建立及三个品质基因的转化
短句来源
     Study on Genetic Diversity and Molecular Phylogeny in Chinese Three Species of Cattle
     中国三个牛种遗传多样性和分子系统进化研究
短句来源
     Comparison on Petrologic Geochemistry of Three Mafic-ultramafic Intrusions Associated with Ni-Cu Sulfide Deposits in Northern Xinjiang
     新疆北部三个与岩浆型Ni-Cu硫化物矿床有关的镁铁—超镁铁质岩的地球化学特征对比研究
短句来源
     The Three Worlds Theory in the Vision of Information Era
     信息化视野中的“三个世界理论”
短句来源
     Molecular and Cytogenetic Characterizations on Hybrids between Three Cultivated Brassica Tetraploids and Orychophragmus Violaceus
     诸葛菜与芸苔属三个四倍体栽培种杂种的分子细胞遗传学研究
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  of three
     Comparison on Petrologic Geochemistry of Three Mafic-ultramafic Intrusions Associated with Ni-Cu Sulfide Deposits in Northern Xinjiang
     新疆北部三个与岩浆型Ni-Cu硫化物矿床有关的镁铁—超镁铁质岩的地球化学特征对比研究
短句来源
     CONCRETE EXAMPLES OF EXISTENCE OF THREE LIMIT CYCLES FOR THE SYSTEM dx/dt=X_2(x,y),dy/dt=Y_2(x,y)
     在平衡点附近dx/dt=P,dy/dt=Q出现三个极限环的例子(P,Q 为二次多项式)
短句来源
     SNAKE VENOM OF AGKISTRODON ACUTUS (FIVE-PACE SNAKE) Ⅰ. PURIFICATION OF THREE TOXIC COMPONENTS
     尖吻蝮蛇(Agkistrodon acutus)蛇毒的研究——Ⅰ.三个毒性组分的纯化
短句来源
     SNAKE VENOM OF AGKISTRODON ACUTUS (FIVE-PACE SNAKE)——Ⅰ.PURIFIGATION OF THREE TOXIC COMPONENTS
     尖吻蝮蛇(Agkistrodon acutus)蛇毒的研究——Ⅰ.三个毒性组分的纯化
短句来源
     Expression and Character of Three Plasmids from Staphylococcus aureus Strain 307 in Bacillus sttbtilis Strains Ki-2 and 168
     从Staphylococcus aureus 307株分离的三个质粒在Bacillus subtilis Ki-2和168株中的表达和特性
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  the three
     The Three Worlds Theory in the Vision of Information Era
     信息化视野中的“三个世界理论”
短句来源
     Observation on the three antigen-antibody systems of hepatitis B
     乙型肝炎三个抗原抗体系统的联合检测及HBsAg动态观察
短句来源
     THE THREE CHARACTERISTIC PARAMETERS OF SUBSTANCE——CONFIGURATION FACTOR, INTERNAL PRESSURE FACTOR AND POLARITY FACTOR AND THEIR APPLICATION
     物质的三个特性参数——构形因子、内压因子和极性因子以及它们的应用
短句来源
     DISCUSSION ON THE THREE BASIC PROBLEMS OF CONTROLLING THE GOLD DEPOSITS IN THE ZHAOYUAN—YEXIAN REGION
     招掖地区控制金矿床的三个基础地质问题初析
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     THE THREE NEW VARIETIES OF MUSTARD
     芥菜的三个新变种
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更多       
  three orders
     When the polarization is considered with zero biase,the UV/solar rejection ratios of Ga-faced solar-blind p-GaN/i-Al_ 0.33 Ga_ 0.67 N/n-GaN IHPs are 750,which meets the Tarsa’s experiment result of about three orders of magnitude.
     在光伏模式下考虑极化效应影响时,Ga面p-GaN/i-Al0.33Ga0.67N/n-GaNIHPs器件的UV/Solar选择比可达750,与Tarsa等人报道的三个量级的实验结果基本一致.
短句来源
     The comparison result shows that calculation speed of the fast calculation formulae is three orders faster than those of REFPRO 6.01, the maximum relative deviation and mean relative deviation of the fast calculation formulae are within 0.56% and 0.025%, respectively.
     与数据源相比,得到的快速计算公式的最大相对计算误差在0.56%之内,平均误差在0.025%之内,计算速度较REFPROP6.01提高三个数量级。
短句来源
     The results show that due to the existence of compact oxidation film, aluminum rich layer and Al Fe alloy layer, the corrosion velocities of hot dipping aluminum steel lower two to three orders of magnitude than carbon steel in H 2S NaCl H 2O media.
     实验结果表明 :由于表面氧化膜 ,富铝层和中间合金化层的存在 ,使得渗铝钢在H2 S NaCl H2 O体系中的平均腐蚀速率比碳钢低两到三个数量级 ;
短句来源
     The fluorescence of europium(III) was enhanced by about three orders of magnitude in the presence of 2.0 10~(-4)mol·L~(-1)TMA(trimesic acid) in aqueous solution at pH 6.The fluorescence intensity could be greatly increased when the system of Eu~(3+)-TMA was treated with La~(3+)and Lu~(3+).
     在溶液的pH为6.0,均苯三甲酸(TMA)的浓度为2.0×10-4mol. L-1时,Eu3+-TMA体系可使Eu3+的荧光强度增大三个多数量级.
短句来源
     The calibration graphs for V and Ti were covered by three orders of magnitude. The detection limit for V and Ti is 1. 5 and 0. 8 ng/ml, respectively. The proposed method has been applied to the direct determination of V and Ti in NIST SRM 1635 coal, and the results obtained are in good agreement with the certified values.
     促进V、Ti的蒸发,检出限分别为1.5和0.8ng/ml,RSD分别为2.8%和1.9%,线性范围达三个数量级,该法用于NIST SRM 1635粉煤标样中V和Ti的测定,结果与参考值吻合很好。
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  three
In this paper, we prove three types of rigidity results related to CAT(-1) spaces, namely the rigidity of the isometric actions on CAT(-1) spaces under the commensurability subgroups, the higher rank lattices and certain ergodic cocycles.
      
This is done by reducing the problem to the case of bipartite quivers of a special form and using a function DP on three matrices, which is a mixture of the determinant and two pfaffians.
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
This wavelet basis is obtained from three wavelet generators by scaling, translation and rotation, and the wavelets are supported either by one corner triangle or a pair of adjacent triangles in the triangulation of level k - 1.
      
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  of three
Every frame is a sum of three (but not two) orthonormal bases-and other frame representations
      
We show that every frame for a Hilbert space H can be written as a (multiple of a) sum of three orthonormal bases for H.
      
In this article we develop analytical and computational tools arising from harmonic analysis on the motion group of three-dimensional Euclidean space.
      
To this end, we review the theory of unitary representations of the motion group of three dimensional Euclidean space.
      
The values of SAξc for all the possible structures of three, four, and five vertices were computed using an in-house computer program.
      
更多          
  the three
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
Our main results relate the convergence of the chromatic expansions to the asymptotic behavior of the coefficients appearing in the three term recurrence satisfied by the corresponding family of orthogonal polynomials PMn(ω).
      
The model developed against chloroquine-resistant malaria parasites was found to yield the best predictions among the three models.
      
Statistical analysis revealed that two of the three models were not intercorrelated.
      
更多          
  three orders
If the diameter of fine roots was defined as being smaller than 0.5 mm, the first three orders of F.
      
The phosphorus quota changed within the limits of three orders of magnitude and the nitrogen quota, within the limits of one order.
      
The number of particles of the DNA-surfactant complex on the substrate was changed by varying the concentration of the initial solution within three orders of magnitude.
      
The experimental diffusion coefficients of rhodamine C and ethanol are three orders of magnitude smaller than the calculated values.
      
It was found that the incorporation of nanostructured silver clusters exhibiting the characteristic optical absorption band with λmax~ 420-440 nm increased the conductivity of cellophane films by two to three orders of magnitude.
      
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  其他


Three adult human brain stems which presented an unilateral hyprtrophy ofthe striae medullares of the fourth ventricle were studied in serial Weigert sec-tions with the following results. The unilateral hypertrophy of the striae medullares is correlated with thehypertiophy of the contralateral nucleus arcuatus. In the hypertrophied nucleus arcuatus the fibers collect themselves towardsthe bottom of the ventral median fissure. The large bundle thus formed coursesdorsally along the raphe, crosses to the other...

Three adult human brain stems which presented an unilateral hyprtrophy ofthe striae medullares of the fourth ventricle were studied in serial Weigert sec-tions with the following results. The unilateral hypertrophy of the striae medullares is correlated with thehypertiophy of the contralateral nucleus arcuatus. In the hypertrophied nucleus arcuatus the fibers collect themselves towardsthe bottom of the ventral median fissure. The large bundle thus formed coursesdorsally along the raphe, crosses to the other side ed emerges on the floor ofthe fourth ventricle. It then turns laterally in the subependymal layer, windingaround the tuberculum acusticum to approach the cerebellum. Besides the main nucleus arcuatus, the fibers of the accessory nuclei on themedioventral surface of the pyramid and of the ventral part of the nucleusraphes also paticipate apparently in the formation of the striae. The scatteredgray patches on the lateral part of the ventricular floor are minor relay stationsof the striae medullares. The nucleus arcuatus and allied nuclear masses are the caudally displacedpontine nuclei. The striae medullares behave just like an aberrent bundle ofthe brachium pontis and, as such, they conduct towards the cerebellum. Besides the striae medullares, the fibers of the nucleus arcuatus are also in-corporated into the ventral external arcuate fibers on the same and oppositesides, which curve around the ventrolateral surface of the medulla oblongatatowards the cerebellum.

三个成人脑干先见第四脑室髓纹一侧偏大,经过染片研究,发现以下的情形。一侧偏大的髓纹与对侧弓状核的偏大是相繋的。在偏大的弓状核中,纤维聚向正中裂底,大束纤维循缝际行向背侧,陆续越边,自室底中線折向外侧,遶过听结节,接近小脑。除了弓状主核,前外侧的副核、缝际核前部似也参加髓纹的合成。室底外侧部的零散核团也收发髓纹纤维。弓状核和连属的核团是脑桥核的下延部分。髓纹相当向下移位的脑桥臂纤维,是傅向小脑的。弓状核的纤维除形成髓纹外,一部进入同边和对边的前外弓状纤维,遶行延髓前外面,似趋奔小脑。

Once the configuration of a rigid frame (including the lengths, crosssections, supporting connections, etc. of all its bars) has been laid out, there exists one set of frame constants, which expresses the elastic characteristics of the frame, and, therefore, is independent of its loading condition. By employing these frame constants, not only the computations of the end moments of all the bars under any one loading condition are greatly simplified, but also, when the frame is to be analyzed under several loading...

Once the configuration of a rigid frame (including the lengths, crosssections, supporting connections, etc. of all its bars) has been laid out, there exists one set of frame constants, which expresses the elastic characteristics of the frame, and, therefore, is independent of its loading condition. By employing these frame constants, not only the computations of the end moments of all the bars under any one loading condition are greatly simplified, but also, when the frame is to be analyzed under several loading conditions, the computations related and not related to loading are distinctly separated, and, therefore, the repeated portion of computations for each loading condition, unavoidable otherwise, is entirely eliminated. As most of the rigid frames encountered in practice have to be analyzed always under many loading conditions, the practical superiority of the methods employing frame constants over other methods is thus obvious.

任一刚構之形式(包括共中各桿之長度,截面,及支承等情形)既經擬定之後,該剛構即有一套表示共彈性特質而與其荷載無關之刚構常數存在。採用此項剛構常數,不但其在任一荷載情形之下桿端力矩計算,大大簡化,而且在多種荷載情形下進行分析時,可將其与荷載無關及有關之二部份計算完全分开,因此省去他種分析法在每一種荷載情形下所必須重複之部份計算。實用之剛構,既常須在多種荷載情形下進行分析,故採用剛構常数分析法在實用中之優越性,至為顯明。採用剛構常数之分析法太約以立特(Wilhelm Ritter)教授之定點法為最早,而於表示剛構常數之各種方式中,亦以定點位置最為簡明,最為基本。本文首先指出:於任一剛構中,每桿之左右兩端各有一個而且祇有一个有獨立性之基本剛構常數,其計算係二個各向左右進行不相牽涉之步驟,但為計算剛構常數本身及桿端力矩之便利计,常須於每桿之左右二端,各另加計算一個無獨立性之輔助剛構常數,惟此外並不需要任何其他第三個剛構常数。恰於廿年以前,我國林同棪教授在國內外發表其力矩一次分配法(林氏原稱其法為“直接力矩分配法”,似欠妥),採用桿端之“約束剛度係數”(restraining rigidity factor),“修正傳...

任一刚構之形式(包括共中各桿之長度,截面,及支承等情形)既經擬定之後,該剛構即有一套表示共彈性特質而與其荷載無關之刚構常數存在。採用此項剛構常數,不但其在任一荷載情形之下桿端力矩計算,大大簡化,而且在多種荷載情形下進行分析時,可將其与荷載無關及有關之二部份計算完全分开,因此省去他種分析法在每一種荷載情形下所必須重複之部份計算。實用之剛構,既常須在多種荷載情形下進行分析,故採用剛構常数分析法在實用中之優越性,至為顯明。採用剛構常数之分析法太約以立特(Wilhelm Ritter)教授之定點法為最早,而於表示剛構常數之各種方式中,亦以定點位置最為簡明,最為基本。本文首先指出:於任一剛構中,每桿之左右兩端各有一個而且祇有一个有獨立性之基本剛構常數,其計算係二個各向左右進行不相牽涉之步驟,但為計算剛構常數本身及桿端力矩之便利计,常須於每桿之左右二端,各另加計算一個無獨立性之輔助剛構常數,惟此外並不需要任何其他第三個剛構常数。恰於廿年以前,我國林同棪教授在國內外發表其力矩一次分配法(林氏原稱其法為“直接力矩分配法”,似欠妥),採用桿端之“約束剛度係數”(restraining rigidity factor),“修正傳遞係數”(modified carry-over factor),及“修正勁度”(modified stiffness)為

It is pointed out in this paper that the following apparent discrepancies exist in Coulomb's Theory: (1) In any problem in mechanics, a force to be definite must have all the three factors involved under consideration. In Coulomb's Theory, however, the point of application of the soil reaction on the plane of sliding is somehow neglected, thus enabling the arbitrary designation of the obliquity of the earth pressure on the wall to be equal to the friction angle between the wall surface and soil. As a matter...

It is pointed out in this paper that the following apparent discrepancies exist in Coulomb's Theory: (1) In any problem in mechanics, a force to be definite must have all the three factors involved under consideration. In Coulomb's Theory, however, the point of application of the soil reaction on the plane of sliding is somehow neglected, thus enabling the arbitrary designation of the obliquity of the earth pressure on the wall to be equal to the friction angle between the wall surface and soil. As a matter of principle, the point of application should never be slighted while the obliquity of the earth pressure could only have a value that is compatible with the conditions for equilibrium. (2) If the point of application of the soil reaction is taken into account in the problem, the sliding wedge would only tend to slide either on the plane of sliding or on the surface of wall but not on both at the same time, thus frustrating the very conceptidn of sliding wedge upon which Coulomb's Theory is founded. (3) The above discrepancies arise from the fact that the shape of the surface of sliding should be curvilinear in order to make the wedge tend to slide as desired, while Coulomb, however, adopted a plane surface instead. (4) Coulomb, in finding the plane of sliding, made use of the maximum earth pressure on the wall (for active pressure), which refers to the different magnitudes of pressure corresponding to different assumed inclinations of the plane of sliding. But from the relation between the yield of wall and amount of pressure, this maximum value is really the minimum pressure on the wall, which it is the purpose of the theory to find. In engineering books, however, this terminology of maximum pressure has caused considerable confusion, with the result that what is really the minimum pressure is carelessly taken as the maximum design load for the wall. How can a minimum load be used in a design?This paper also attempts to clarify some contended points in Rankine's Theory: (1) It is claimed by Prof. Terzaghi that Rankine's Theory is only a fallacy because of the yield of wall and that of the soil mass on its bed. This charge is unjust as it can be compared with Coulomb's Theory in the same respect. (2) Some books declare that Rankine's Theory is good only for walls with vertical back, but it is proved in this paper that this is not so. (3) It is also generally believed that Rankine's Theory is applicable only to wall surfaces with no friction. This is likewise taken by this paper as unfounded and illustration is given whereby, in this regard, Rankine's Theory is even better than Coulomb's, because it contains no contradiction, as does Coulomb's.

本文從力學觀點對庫隆理論提出下列問題:(1)在解算力學問題時,每個力有三個因素都該同時考慮,但庫隆對土楔滑動面上土反力的施力點竟置之不理,因而才能對擋土墙上土壓力的傾斜角作一硬性假定,使它等於墙和土間的摩阻角,然而施力點是不能不管的,因而土壓力的傾斜角是不能離開平衡條件而被隨意指定的。(2)如果考慮了土反力的施力點,則土楔祇能在滑動面上,或在墙面上,有滑動的趨勢,而不能同時在兩個面上都有滑動的趨勢,因而庫隆的基本概念“滑動土楔”就站不住了。(3)問題關鍵在滑動面的形狀;如要使土楔在滑動面和墙面上同時有滑動趨勢,則滑動面必須是曲形面,然而庫隆採用了平直形的滑動面。(4)庫隆的土楔滑動面是從墙上最大的土壓力求出的(指主動壓力),這裏所謂“最大”是指適應各個滑動面的各個土壓力而言,但對適應墙在側傾時土壓力應有的變化來說,這個最大土壓力却正是墙上極限壓力的最小值。一般工程書籍,以為這土壓力既名為最大,就拿它來用作設計擋土墙的荷載,荷載如何能用最小的極限值呢?本文對朗金理論中的下列問題作了一些解釋:(1)朗金理論在擋土墙的位移問題上所受的限制,是和庫隆理論一樣的,竇薩基教授曾就此問題認為朗金理論是幻想,似乎是無根據的。...

本文從力學觀點對庫隆理論提出下列問題:(1)在解算力學問題時,每個力有三個因素都該同時考慮,但庫隆對土楔滑動面上土反力的施力點竟置之不理,因而才能對擋土墙上土壓力的傾斜角作一硬性假定,使它等於墙和土間的摩阻角,然而施力點是不能不管的,因而土壓力的傾斜角是不能離開平衡條件而被隨意指定的。(2)如果考慮了土反力的施力點,則土楔祇能在滑動面上,或在墙面上,有滑動的趨勢,而不能同時在兩個面上都有滑動的趨勢,因而庫隆的基本概念“滑動土楔”就站不住了。(3)問題關鍵在滑動面的形狀;如要使土楔在滑動面和墙面上同時有滑動趨勢,則滑動面必須是曲形面,然而庫隆採用了平直形的滑動面。(4)庫隆的土楔滑動面是從墙上最大的土壓力求出的(指主動壓力),這裏所謂“最大”是指適應各個滑動面的各個土壓力而言,但對適應墙在側傾時土壓力應有的變化來說,這個最大土壓力却正是墙上極限壓力的最小值。一般工程書籍,以為這土壓力既名為最大,就拿它來用作設計擋土墙的荷載,荷載如何能用最小的極限值呢?本文對朗金理論中的下列問題作了一些解釋:(1)朗金理論在擋土墙的位移問題上所受的限制,是和庫隆理論一樣的,竇薩基教授曾就此問題認為朗金理論是幻想,似乎是無根據的。(2)有些工程書中認為朗金理論是專為垂直的墙?

 
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