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  h—h
     There are B-H bond, H-H bond and atom-molecular bond in BH+4 and BH4. There are four equivalent B-H bonds in BH-4. In the case of BH4 there is an unpaired electron that occurs near the boron atom.
     BH4+和BH4中都存在B—H键、H—H键和原子-分子键; 而BH4-中存在着四个相同的B—H键;
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     Bleaching experiments on soda-anthraquinone (AP + AQ) and kraft pulps (KP) of E. citriodora have been carried out in the H, H-H, C-E-H, and C-E-H-D sequences. Bleaching properties of kraft pulps of E.
     对柠檬桉烧碱—蒽醌浆(AP+AQ)和硫酸盐浆(KP)进行了H单段,H—H两段,C—E—H三段以及C—E—H—D四段漂白试验。
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     However it is shown that the H2 molecule can be adsorbed on Ag(111) surface with H-H bond paralled to the surface, this result seems to be in fairly good agreement with the result of high resolution electron-energy-loss spectra for H2 on Ag at low temperature.
     H_2分子在表面处发生解离吸附。 在Ag(111)表面上,H原子有可能以分子状态吸附,H—H键平行于表面,这与高分辨率电子能量损失谱所得到的实验结果一致;
短句来源
     A method of determining the three-dimensional structure for proteins in aqueous solution by a set of distance constraints between backbond atoms (mainly for H -H, obtained from NMR) was developed.
     提出一种以核磁共振(NMR)技术获取蛋白质分子多肽链中原于对(主要是H—H对)的距离约束,来计算蛋白质在溶液中的三维结构的方法。
短句来源
     The structure of BMPAzo was confirmed with NMR,MS,IR techniques and elementary analysis. The peaks in the NMR spectrum were interpreted in detail with the study of the two dimension H-H spetrum.
     通过对H—H二维相关谱的详细解析 ,对BMPAzo的NMR谱进行了归属 ,并结合MS、FT -IR、元素分析等技术 ,对目标产物BMPAzo的结构进行了确认
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  h-h
     n algorithm was developed to calculate protein solution conforniations from 2DNOESY intensities. With the complete relaxation matrix analysis programMARDIGRAS the H-H atom distance constraints are evaluated. With the distaneegeometry program DISMAN the three dimensional structures of proteins are calculatedwhich are refined further by the restrained molecular dynamics program r-MD andthe energy rninimization program r-EM.
     建立由2DNOESY诺峰强度计算蛋白质溶液构象的实用方法,先用完整弛豫矩阵分析方法程序计算H-H原子间距约束,然后用距离几何算法程序计算出三锥空间结构,再用有约束的分子动力学算法程序结合能量优化程序精化结构,并模拟出该结构的NOESY诺峰强度与实验NOESY谱峰强度对比,经多次迭代计算与精化得到合理稳定的蛋白质构象。
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     Using a quasiclassical trajectory method, the results including vibration rotation coupled excitations and a aligned propensity of the rotational excitations for H-H 2O colliding system were presented, which are agreement essentially with the recent experiments.
     利用半经典微扰理论计算了在H-H2O的非弹性碰撞中的H2O分子的转动、振动激发,并将计算结果与实验结果进行比较。
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     These features are obtained by long-term physiological experiments, or by H-H equation with computer simuiation which we carried out The neuron models, which have these nine neuron properties, are not convenient for mathematical analysis.
     这些特性是从长期的生理实验中获得的,也可以由H-H方程经计算机模拟获得[1],我们作了这些模拟。 由这九个特性构成的神经元模型不便于作统一的数学分析。
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     The resuItsshowed that the subunit structure of fibroin expresses two different types : Bombyx moriand Bombyx mandarina are H-L type , Antheraea pernyi、Antheraea yamamai、Philosamia cynthia Philosamia cynthia ricini are H-H type , The six silkworms havespecies specificility in amino acid composition of their fibroin.
     结果表明,丝心蛋白亚基的组成家蚕、野桑蚕表现为H-L型,天蚕、柞蚕、樗蚕、蓖麻蚕为H-H型。
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     The molecular mechanics calculation started with the sugar-rings inchair-form,CH_3 used instead of R_F group.Conformer 1 is convinced as the stableone in polar solvents by energy minimization. Good agreement is observed betweenthe calculated and expermental H-H distances of conformer 1.
     分子力学计算中,根据能量最低原则,算得φ_(oc1'oc4)角为89.4°,中φ_(oc6c5o)(及φ_(oc6'c5'o)角)角为-177.2°时的构象最为稳定,从这一稳定构象读得的相应8对H-H间的距离与NOESY的结果符合。
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  “h-h”译为未确定词的双语例句
     PHASE DIAGRAMS OF Y(HCO_2)_3-HCO_2H-H_2O SYSTEM AT 35.0-60.0℃
     Y(HCO_2)_3-HCO_2H-H_2O体系35.0—60.0℃相图
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     the formula of plant height of a linear highway: H=h1+(h-h1)B1/B or H=h2-(h2-h1)B2/B;
     平直线路段植株高度公式为H=h1+(h-h1)B1/B或H=h2-(h2-h1)B2/B(h1表示车辆前照灯的高度,h2表示驾驶员视线高度,H表示中央分隔带植株的高度);
短句来源
     Mechanisms of H-H Insertion and Addition of Cumulene Carbene H_2CCC:
     亚乙烯基卡宾H_2CCC:的氢氢键插入和加成反应机理的研究
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     A parameter equqtion has been introduced to the boundary slip line in the Drawing deformed zone with a fractional reduction ε=(H-h)/H=2sinθ/(1+2sinθ) and a distributed function of hydrostatic pressure P has been obtained using integration by substitution.
     对断面减缩率ε=(H-h)/H=2sinθ/1+2sinθ的拉拔滑移线场边界滑移线引进参数方程并进行换元积分求得静水压力P的分布函数。
短句来源
     THE CALCULATION OF NUCLEAR SPIN-SPIN COUPLING CONSTANTS Ⅲ THE CALCULATION OF H-H COUPLING CONSTANTS ~3J、~4J、~5J……IN HYDROCARBON MOLECULES
     核自旋偶合常数的计算(Ⅲ) 烃类分子H-H偶合常数~3J、~4J、~5J…的计算
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  h-h
The profiles of local density and distribution functions of the dipole moment orientations, the directions of valence and H-H bonds were obtained.
      
The extinction ratio is found from the relation k = dD/dh, where dD = D(h)-D(h0) is the difference of the optical densities in the working cell and in the comparison cell and dh = h-h0 is the difference of the thicknesses.
      
Structure of products of H-H and C-H bond activation by Ni atom, Ni2 cluster, and Ni-porphyrin complex of Ni2 cluster
      
New catalytic systems based on porphyrin complexes of Ni2 cluster and capable of activating C-H and H-H bonds are proposed.
      
The isomerization of the bridged Pd2H2complex into the transcomplex with a maximal barrier of 21.5 kcal/mol rather than the activation of the H-H bond is the most important reaction step.
      
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The analysis of rigid frames with so called "span-change" beams such as curved, gabled, folded or trussed ones is rather difficult. The method of redundant forces or method of slope deflection are too tedious to be used in practical work. In this paper a new method namely the method of propagating unbalanced moments and lateral forces is proposed for analyzing such frames.The principle of this method is some what like that of the one cycle method of moment distribution for analyzing rigid frames with straight...

The analysis of rigid frames with so called "span-change" beams such as curved, gabled, folded or trussed ones is rather difficult. The method of redundant forces or method of slope deflection are too tedious to be used in practical work. In this paper a new method namely the method of propagating unbalanced moments and lateral forces is proposed for analyzing such frames.The principle of this method is some what like that of the one cycle method of moment distribution for analyzing rigid frames with straight beams and its procedure may be briefly described as follows: the unbalanced moments and lateral forces at all joints of the frame are calculated first and propagated successively to all the other joints by means of a set of the so-called constants of deformation-propagation, which are to be computed from the properties of the frame only. Then its original and various propagated unbalanced moments and lateral forces at each joint are summed up and distributed among all the bar-ends at that joint according to special formulas to obtain the distributed moment and lateral force at each bar-end. Finally, the balanced moment and lateral force at each bar-end are obtained simply by summing up the following three components respectively: (1) those at each bar-end assumed fixed, M~F and H~F; (2) those propagated to each bar-end, M~P and H~P; and (3) those distributed to each bar-end, M~D and H~D. That is:M=M~F+M~P+M~D, H=H~F+H~P+H~D.Evidently, the procedure of this method is very simple and direct, and the work of calculations is greatly reduced, especially when any span-change rigid frame is to be analyzed for many loading conditions.Two typical examples are given in this paper to illustrate the application of the method and the author hopes deeply that this method will be found usefull by the structural engineers in designing such rigid frames.

凡具有曲梁、山牆式梁、摺式梁、门式梁、桁架梁或其他“跨变”横梁之剛構均可称为“跨变剛構”。跨变剛構常为高次的超靜定結構,其应力分析至为复杂。採用冗力法、最少功法或角变位移法以分析此类刚構,常嫌过繁,当结構受有多种荷載情形时,更需作多次計算,尤覺繁不堪言,頗不为实际工作者所乐用。著者於本文發表一不均衡力矩及侧力傳播法以分析此类剛構。無論剛構本身以及單个的跨变横梁是否对称,也不論組成剛構的各个桿件为等截面或为变截面,本法均可适用,因此本法之实用范圍可称广泛。 本法之基本观念可簡單描述如次:首先將作用於各結点的不均衡力矩及側力,傳播至所有其他結点之桿端,求得每一結点的不均衡力矩及侧力的总值,然后經过一次分配則可得出該結点桿端之分配力矩及分配侧力。計算所需之最終桿端力矩及侧力即为a)定端力矩或側力,b)傳播力矩或侧力,以及c)分配力矩或側力三者之和。 本法之性质属于一次分配法之范疇,共精神与我国結構学者蔡方蔭先生所得分析直桿剛構之“不均衡力矩傳播法”甚为相似,如果跨变横梁变为直桿,則本法所得計算公式即簡化而成蔡氏所得之公式。 文中举二算例,以明本法之应用。 著者認为採用此法以分析跨变剛构,不仅計算可趋精簡,且当結構承...

凡具有曲梁、山牆式梁、摺式梁、门式梁、桁架梁或其他“跨变”横梁之剛構均可称为“跨变剛構”。跨变剛構常为高次的超靜定結構,其应力分析至为复杂。採用冗力法、最少功法或角变位移法以分析此类刚構,常嫌过繁,当结構受有多种荷載情形时,更需作多次計算,尤覺繁不堪言,頗不为实际工作者所乐用。著者於本文發表一不均衡力矩及侧力傳播法以分析此类剛構。無論剛構本身以及單个的跨变横梁是否对称,也不論組成剛構的各个桿件为等截面或为变截面,本法均可适用,因此本法之实用范圍可称广泛。 本法之基本观念可簡單描述如次:首先將作用於各結点的不均衡力矩及側力,傳播至所有其他結点之桿端,求得每一結点的不均衡力矩及侧力的总值,然后經过一次分配則可得出該結点桿端之分配力矩及分配侧力。計算所需之最終桿端力矩及侧力即为a)定端力矩或側力,b)傳播力矩或侧力,以及c)分配力矩或側力三者之和。 本法之性质属于一次分配法之范疇,共精神与我国結構学者蔡方蔭先生所得分析直桿剛構之“不均衡力矩傳播法”甚为相似,如果跨变横梁变为直桿,則本法所得計算公式即簡化而成蔡氏所得之公式。 文中举二算例,以明本法之应用。 著者認为採用此法以分析跨变剛构,不仅計算可趋精簡,且当結構承受多种荷載情形时,尤其具有显明?

The use of the method of charaeterictics to solve super-critical flow problems has been previously established by several authors.In most cases,frictional resistance and bottom slope have been neglected.Taking into consideration the above two factors(Fig.1),the equation of continuity and the equations of motion are respectively (hu)_x+(h_v)_y=0.(1) uux+vu_y=g sin i-((g/2h))(h~2osi)_x-τu/ρhq.(2) uv_x+vv_y=-((g/2h))(h~2cos i)_y-τv/ρhq.(3) Where the subscripts denote the variables with respect to which partial...

The use of the method of charaeterictics to solve super-critical flow problems has been previously established by several authors.In most cases,frictional resistance and bottom slope have been neglected.Taking into consideration the above two factors(Fig.1),the equation of continuity and the equations of motion are respectively (hu)_x+(h_v)_y=0.(1) uux+vu_y=g sin i-((g/2h))(h~2osi)_x-τu/ρhq.(2) uv_x+vv_y=-((g/2h))(h~2cos i)_y-τv/ρhq.(3) Where the subscripts denote the variables with respect to which partial differentiations are made. Making use of the condition of irrotational flow v_x-u_y=O,(4) the energy equation can be obtained d((q~2/2))+gcosidh=gsinidx+(1/2)gh sin i·i_xdx-(τqdz)/(ρhu) =(gusini+(1/2)guh sin i·i_(τq)/(ρh))(dx/u).(5) The above are the fundamental equations for the type of flow discussed. It can be shown that the two systems of characteristics in the physical plane and the u v plane(Fig.2)are represented by C~+:dy~+=ξ~+dx~+.(21a) Γ~+ξ~-(dv~+)/(du~+-Gdx~+)=-1.(21b) and C~-:dy~-=ξ~-dx~-.(22a) Γ~-:ξ~+.(dv~-)/(du~-)-Gdx~-=-1.(22b) Where ξ~±=(15) G=(gu sin i+(1/2)guh sin i·i_x+(τq/ρh))/(u~2-ghcosi).(23) The superscripts + and- refer to the pertinent system of characteristics. For flat-bottom,frictionless channels,G=0;(21b)and(22b)indicate that at cor- responding points the tangents of C~+ and C~- are perpendicular to those of Γ~- and Γ~+ respectively and the Γ characteristics are systems of epicycloids. Taking into consideration the varying bottom slope along the x-direction and the bottom friction τ,it can be shown that the velocity vector still bissets the C characteristics(Fig.2) and both A~+ and A~- are given by q~2sin~2A=ghcosi.(20) With G different from zero,(21b)(22b)can no longer be integrated to give analytic forms and the angles between the tangents,φ~+ and φ~-,no longer equal to π/2.How- ever,based on these two equations,a graphical method is proposed,as illustrated in Fig. 6.

本文从基本方程式出发,导演了明渠急流在有底坡和摩阻力情形下的特性线方程式及沿特性线的关系式,根据各式说明任何一点流速方向、特性线方向及特性线在速度平面内的对应曲线方向之间的关系,最后建议近似的图解法并举例说明其应用.

Systematic scour tests of solid and artificially dispersed two-dimensional water jets have been carried out with sand and gravel as bed materials. The angles of inclination of jets are 45°and 90°. Based on the results of experiments, two different types of scour, i.e., the shallow tailwater type and the deep tailwater type, are proposed. In the former type, the depth of water in the scoured pit required for equilibrium is independent of the tailwater depth, whereas in the latter, it is dependent on the tailwater...

Systematic scour tests of solid and artificially dispersed two-dimensional water jets have been carried out with sand and gravel as bed materials. The angles of inclination of jets are 45°and 90°. Based on the results of experiments, two different types of scour, i.e., the shallow tailwater type and the deep tailwater type, are proposed. In the former type, the depth of water in the scoured pit required for equilibrium is independent of the tailwater depth, whereas in the latter, it is dependent on the tailwater depth. The law of diffusion of solid jets in the water cushion is found to be similar to that of free turbulent jets. In the case of 90°, the ratio between the initial velocity of a solid jet in the immerging section and the average velocity on the bottom of the pit, when the scouring action has reached its equilibrium condition, is found as shown in Fig 4 or formulas (10) and (11). Meanwhile, the bottom velocity is found to be smaller than the scouring velocity of the bed material under uniform flow condition, and the relation between them is shown in Fig. 5 or formula(13). The effect of the degree of dispersion and aeration of water jets on the depth of scour is also preliminarily investigated. In the case of 45°jets (both solid and dispersed), formulas for the estimation of scour are given as follows: For the shallow tailwater type, h_p=1.38Φ~(0.25)/((a~(1/9)D~(0.25))q~(0.75)z_0~(0.125).(26a) For the deep tailwater type, h_p=2.3×(q)/(1/2)~((p_s-p)/p×gD)+3/(a+3)h_H. (27a) Comparison of the data on model tests of bucket type energy dissipators with the corresponding results computed by these formulas shows that they are fairiy consistant.

在实验室二元水槽中进行了入射角为90°及45°的纯水射流及人工分散搀气射流对砂卵石床料冲刷的系统试验。根据试验成果,提出区分浅水型冲刷与深水型冲刷的概念,前者在冲刷平衡时坑中水深与下游水深无关,后者则有较大关系;冲刷坑平衡时坑底水股的断面平均流速比等流量下均匀流的不冲流速为小,两者存在一定的函数关系,根据这一关系及射流在水垫中扩散的规律,可根据均匀流的不冲流速估算纯水射流对河床的冲刷深度;对于射流在分散搀气情形下对减弱冲刷的作用进行了初步的研究,在-15°的人工分散射流,浅水型冲坑平衡水深的减低约为分散度1/9次方的关系,在深水型则减弱冲刷的作用较大,得出在一定范围内初步估算冲坑平衡水深的关系式。文中曾将若干实际工程鼻坎挑流的模型冲刷试验成果与用所得公式计算的结果进行比较,说明尚能符合。

 
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