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旋转一周
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  rotated a period
     It has the functions of overspeed alarm and series communication entrance,it can match the photoelectric coders of different line numbers (refers to output pules number of the main spindle of the coder to be rotated a period),realizing measure of low-high speed values.
     它具有超速报警与串行通讯口功能 ,还可以配接不同线数的光电编码器 (指编码器主轴旋转一周输出的脉冲数 ) ,实现高低转速值的测量。
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  “旋转一周”译为未确定词的双语例句
     The results show the inner kiln wall temperature changes between 1232℃ and 1334℃ in sintering zone,which will make lining break down easily.
     结果表明:窑体旋转一周,烧成带窑壁内表面温度将在1 232~1 334℃变化,这易导致窑壁热疲劳破坏;
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     It can get radian About consecutive curve y = f(x) by V = An plane figure which Radian AB and straight line x = a x = b and axis revolves a circle around X axis, the volume of objects in revolving shape comes out.
     用V=π∫_a~bf~2(x)dx可求得连续曲线y=f(x)的弧AB与直线x=a,x=b及x轴所围成的平面图形绕x轴旋转一周得到的旋转体的体积。
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     The damage is cumulative,and the fatigue life of the drill pipe isthe damage accumulation.
     损伤是可以积累的,钻柱每旋转一周时将受到一次疲劳损伤,钻柱的寿命与疲劳损伤积累有关。
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     The theoretical system for analyzing kinematical rule for every cutter of PDCbit is proposed. The methods for calculating and determining the velocity,cutting area,bottomhole angle and removal rock volume of every cutter are introduced. These methods areavailable for evaluating and culculating the working conditions and the property of everycutter on PDC bit.
     根据PDC钻头的运动特点及工作特点,建立了描述PDC钻头各个切削齿运动规律的理论分析体系,给出了计算或确定各切削齿运动速度、切削面积、井底角、旋转一周的破岩体积、切削齿的工作部位等参数的具体方法,为分析和评价或定量计算各切削齿工作条件和钻头总体性能奠定了基础
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     Equal volume design is one of the basic methods adopted in the cutters' distribution design of PDC bits,which requires that the volume cut by each cutter should be equal while PDC bit rotates in a circular course.
     等体积设计是PDC钻头布齿设计的基本原则之一,等体积设计原则下要求PDC钻头旋转一周每一颗切削齿所切削的岩石体积相等。
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     Spin Control
     旋转控制
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     WEEKLY ECONOMY
     经济一周
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     ELLIPTIC REVOLUTION
     椭圆旋转
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     Work pieces to be tested were in turn rotated a circle by centers,which lined up parallel to the detector.
     被扫描试件依次绕与探测器平行的多个旋转中心各旋转一周
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     Shanghai Fashion Week
     上海时装一周
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The principle and structure of the beam profile monitor and its experimental results on the ion source test bench are described. The magnetic-coupled static vacuum seal is used in the device to replace rotational vacuum seal. A 45° helix wire is used as a scanning probe. When the probe rotates a circle, the picture of the beam profile in two perpendicular directions is given, the position of the beam in the beam line and its intensity are also displayed. The dimensions of this device is 120mm in diameter and...

The principle and structure of the beam profile monitor and its experimental results on the ion source test bench are described. The magnetic-coupled static vacuum seal is used in the device to replace rotational vacuum seal. A 45° helix wire is used as a scanning probe. When the probe rotates a circle, the picture of the beam profile in two perpendicular directions is given, the position of the beam in the beam line and its intensity are also displayed. The dimensions of this device is 120mm in diameter and 180mm in length.

本文介绍束流截面监示仪的原理、结构和在离子源试验台上的实验结果及其优缺点。 本截面仪采用45°螺旋线探针。探针每旋转一周就给出了在两个互相垂直的方向上束截面的形状,也指明了束在束管中的位置和束流大小。束截面仪的使用给束的调节带来了方便。 本截面仪采用磁耦合静密封代替旋转密封,结构简单、使用方便。外形尺寸为φ120×180mm。

The electronic structures of the porphin and its dimer have been calculated by EHMO.From the differential charge distribution in the porphin dimer it has been shown that the porphin molecule belongs to the amphoteric electron donor-aceeptor in its dimer,having steady donor centers and acceptor centers.The system has minimum energy at the orientation angle ψ=45°.4-fold barriers should be overcome when two monomers rotate each other.The barrier is ~0.09 eV.The degenerate perturbation theory has been expanded to...

The electronic structures of the porphin and its dimer have been calculated by EHMO.From the differential charge distribution in the porphin dimer it has been shown that the porphin molecule belongs to the amphoteric electron donor-aceeptor in its dimer,having steady donor centers and acceptor centers.The system has minimum energy at the orientation angle ψ=45°.4-fold barriers should be overcome when two monomers rotate each other.The barrier is ~0.09 eV.The degenerate perturbation theory has been expanded to deal with the dimer system,and according to this result the energy level corespondence between the monomer and the dimer has been explained quantitatively.It has been shown that the cause of the interaction is the charge transfer between the donor center and the acceptor center in the dimer. The model for calculation is shown in Fig.1.The frontier orbitals and those nearby them are all π ones(ref.Table 1),and the difference between the π-π interaction energy and the total energy is less than 10% of the total one.Thereby, we only calculate the π-π interaction for simplicity. Two kinds of calculation have been tried:in one case,a pair of N atoms are of one p_π electron on each atom,and the other pair of N atoms are of two p_π electrons on each atom;in another case,all four N atoms are of one and a half p_π electrons on each atom.No matter how we start our calculation,the conclusion is all the same,namely,all four N atoms occupy 1.59 p_π electrons at last. From Table 2 it can be seen that atoms C(1)and N(21)keep accepting electron, and atoms C(2)and C(3)keep donating electing electrons.The differential charge distribution is shown in Fig.2.It is clear that there are donor center and accepter center in the monomers of the dimer. The total energy E's at the several orientation angle ψ's are shown in Fig.3. The energy of the system is minimum at orientation angle ψ=45°,so that the system is of the most stable configuration in this case.Comparing the differential charge and the energy,we can conclude that there is an one-to-one correspondence between the charge transfer and the energy of system,the minimum energy corresponding with the maximun charge transfer(ref.Fig.4).From this we can conclude that the charge transfer plays a decisive role in the cause of dimer formation although the amount of the charge transfer is very small. The rotation barrier is 0.088 eV (2.03 kcal mol~(-1),which is much large than the heat rotation-kinetic energy 0.6 kcal mol~(-1) at room temperature,so there is no free rotation in the dimer at this condition. We assume that the porphin dimer is a super-molecule in culeulation.We use the degenerate perturbation theory to deal with the dimer's energy levels from the monomer's energy levels.The Eq.(1)and Eq.(2)are respectively the Schrodinger Eqs.of the perturbed monomer system and the unperturbed monomer system in the dimer.By means of Eq.(1) to Eq.(15),we obtain the result Eq.(16),in which the suffix 1 expresses the state of a monomer in the dimer and the suffix 2 expresses the state of another monomer in the dimer.The energys E_p calculated from the perturbation theory Eq.(16) and the energy levels E_L calculated from LCAO variation method are given in Table 3 for comparison,in which we can see that our treatment is very successful.

本文用EHMO法对卟吩及其复合体的电子结构进行了计算。由卟吩复合体的差示电荷分布的分析表明,在卟吩复合体中卟吩分子属于两性电子施受体,分子中有固定的施体中心和受体中心部位。体系在相对取向角φ为45°时能量最小。两个分子相对旋转一周要克服四重势垒,势垒高度为~0.09_eV。本文把简并态微扰理论推广运用于两个分子组成的复合物体系,并由此定量地解释了卟吩与其复合体之间存在的能级对应现象。

Liaoning Province is located in the circum-Pacific volcanic belt where diastro-phic and volcanic activities occured repeatedly during Mesozoic and Tertiary, forming several hundreds of volcanic cones and mounds which occupy an area about 7,000km~2. The total thickness of the volcanic rocks is 3,000 metres. They are classified into the lower Yanshan volcanic rock, upper Yanshan volcanic rock and Himalayan basalt according to the interrelation between their cyclothems of magmatic differentiation and the sediments...

Liaoning Province is located in the circum-Pacific volcanic belt where diastro-phic and volcanic activities occured repeatedly during Mesozoic and Tertiary, forming several hundreds of volcanic cones and mounds which occupy an area about 7,000km~2. The total thickness of the volcanic rocks is 3,000 metres. They are classified into the lower Yanshan volcanic rock, upper Yanshan volcanic rock and Himalayan basalt according to the interrelation between their cyclothems of magmatic differentiation and the sediments of erupting intervals. There are usually sedimentary coal series of intervals interbedded in the volcanic rocks developed ia different geological times. The typical occurrence can be seen in some coal fields in Shuangtagou of Nanpiao, Shahezi of Changtu, Wenduhua of Tianshan and Fushun. All of these coalfields, surrounding rocks of central eruption, developed in the marginal belts of volcanos. It shows that the coal accumulation is controlled by the volcanic-structural mechanism. Thus, in origin, these coal series are sharply different from those usually seen in shallow-sea, offshore or inland environments.

辽宁省有火山岩7000km~2,岩垣3条,大型锥火山50个,火山丘80余个,边缘带上都有间歇期沉积煤系赋存,成煤空间局限火山边缘带,时间局限间歇期。煤系具火山-沉积成岩、多变、多层次、依赖火山特点,属新的火山成煤类型。愈往西北岩体愈大,煤系呈愈发育的趋势。煤层发育在火山岩系顶、底部,可采煤层厚1—37.49m。煤种齐全,埋藏的数量和广度均大,具有重要的经济价值。找煤方向为各岩体边缘并围绕中心旋转一周

 
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