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four-dimensional
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  四维
     Four-dimensional quantum scattering calculations on the D+CD_ 4→CD_ 3+D_ 2 reaction
     D+CD_4→CD_3+D_2反应的四维量子散射计算
短句来源
     The Lorentz factory 1-v2/c2~(1/1-v2/c2) and four-dimensional interval t2-x2/c2may be interpreted from the point of view of a space technologist.
     从空间测量的角度可以对洛伦兹因子((1-U~2)/c~2)~(1/2)和四维间隔t~2-x~2/c~2的物理意义进行解释.
短句来源
     Demonstrated Homomorphic Characteristic Between SO(4,2) and SU(2,2) by Stereographically Projecting of Four-dimensional Coordinates
     借助于四维坐标的球极平面投影验证SO(4,2)与SU(2,2)间的同态特性
短句来源
     Some Natures of the Four-dimensional Clifford Algebras Cl_2
     四维Clifford代数Cl_2的若干性质
短句来源
     Methods:60 patients with left-side cardiac valve disease were examined with transthoracic echocardiography (TTE)> transesophageal echocardiography(TEE) and four-dimensional reconstruction(4D).
     方法:60例左心瓣膜疾病患者均接受经胸壁二维超声心动图(TTE)、经食管超声心动图(TEE)检查,获取二维图像,然后进行四维(4D)重建,结果与手术观察作对照。
短句来源
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  四维度
     Marx's theory on social harmony mainly includes four aspects,which is a four-dimensional relationship between humans and nature,humans and society,humans and humans,and humans themselves.
     马克思关于“和谐社会”的理论主要是从与人相关的4个方面的关系来论述的,也就是:人与自然、人与社会、人与人及人与自身关系和谐的四维度的思想,这一思想对于我们今天全面构建社会主义和谐社会,具有十分重要的启示和现实指导意义。
短句来源
     According to the four-dimensional model of service innovation,there are four key elements of travel:the new concept of tourist service,the new interface of visitor,the new transmit system of tourist,the choice of new technology.
     基于服务创新四维度模型,提出旅游服务创新包括四个要素:新旅游服务概念,新的游客界面,新旅游服务传递系统,新技术选择。
短句来源
     Application of the four-dimensional model of service innovation in manufacturing industry
     服务创新四维度模型在制造业中的应用
短句来源
     Analysis of the four-dimensional model of travel service innovation
     旅游服务创新的四维度模型分析
短句来源
     Among the numerous research efforts on this topic, the four - dimensional culture model of a national culture and the relative analysis among countries, established by Hofstede (1980) are most widely accepted.
     在众多的研究中,Hofstede提出的文化四维度以及对各国的文化差异分析是被广为接受的研究成果。
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  “four-dimensional”译为未确定词的双语例句
     The compactification of the seven-dimensional Einstein-Maxwell theory into four-dimensional Minkowski space M4 ×S1 ×S2 is found to be stable.
     7维爱因斯坦-麦克斯韦理论紧致到4维闵可夫斯基空间(M4)×S1×S2,没有发现有快子,因此可认为这是稳定的.
短句来源
     The four-dimensional SVRT model is applied to study the reaction of SiH_4+H→H_2+SiH_3.We contrast the energy dependence of the calculated reaction probability to that of reaction CH_4+H→CH_3+H_2. Rate constant of the calculated reaction shows closely agreement to that of Truhlar and the experimental results.
     对SiH4+H→H2+SiH3反应体系应用SVRT模型进行了4维的量子动力学计算。 将得到的速率常数与实验数据以及其他理论方法进行比较,得出了一些有意义的结论,并与CH4+H→H2+CH3反应在同种理论模型下做了对比,较好的与实验相吻合。
短句来源
     Results: The accuracy of four-dimensional ultrasound was 100%,while that of two-dimensional ultrasound was 85.7% between 14 to 24 weeks of gestation.
     结果:37例畸形中,21例孕14~24周有体表结构畸形的胎儿,产前二维、实时三维超声诊断符合率分别为85.7%、100%;
短句来源
     Objective To assess whether three-dimensional/four-dimensional(3D/4D) spatiotemporal image correlation(STIC)could provide more information of fetal heart over routine two-dimensional fetal echocardiography.
     目的评估3D/4D时间-空间相关成像(STIC)是否能比常规二维胎儿超声心动图提供更多胎儿心脏的切面及信息。
短句来源
     On the Four-Dimensional Mode of Emotional Education
     论情感教育四元模式
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  four-dimensional
Dynamics of the four-dimensional relay system with hysteresis was studied.
      
For self-diagnosis of the failed components in a four-dimensional hypercube, two examples illustrating the distinctive features of the procedures were presented.
      
A specific four-dimensional construction that consists of tetrahedra and octahedra and has symmetry of the {3, 3, 5} polytope is determined.
      
Holonomy groups of four-dimensional pseudo-Riemann spaces
      
Four-dimensional pseudo-Riemann spacesV1 with a metric having the signature (3, 1) are investigated.
      
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In this paper, a covariant partial wave analysis of interactions of two particles with low spin value is discussod. Covariant angular momentum operators and relativistic invariant angular quantum numbers are introduced. Using the commutation relations of the covaxiant orbital angular momentum operators and the fou-rdimensional relative momentum operators, the representatives of the covariant orbital angular momenta in the four-dimersional relative momentum representation are uniquely determined, and their eigenfunctions...

In this paper, a covariant partial wave analysis of interactions of two particles with low spin value is discussod. Covariant angular momentum operators and relativistic invariant angular quantum numbers are introduced. Using the commutation relations of the covaxiant orbital angular momentum operators and the fou-rdimensional relative momentum operators, the representatives of the covariant orbital angular momenta in the four-dimersional relative momentum representation are uniquely determined, and their eigenfunctions are obtained. In the case of particlcles with 1/2 spin and photons, rising the Dirac's equations and the Maxwell's equations, spin operators are defined as the constitutions of the covariant total angular momentum operators. Covariant partial wave analyses for scattering of two particles with O, 1/2 spin, and photoproduction of pious on nucleons are obtained, invariant amplitudes are expressed in terms of relativistic invariant quantities. Usual angular quantum numbers and cosines of scattering angles in the center-of-mass system are replaced by the relativistic invariant angular quantun numbers and scalar products of initial and final four-dimensional relative momenta, respectively. Modulus of total four-momentun take roles as energies in the center-of-mass system in the old noncovariant partial wave analysis. Our results can remove the difficulty that the formalism of angular momontum is not suitable when seeka relativistic invariance in the study of a scattering process through the partial wave expansion.

本文討論低自旋情况下的两粒子相互作用的协变的分波分析問題。引入了协变的角动量算符和相对論不变的角量子数,利用协变的軌道角动量算符与四維相对动量算符的对易关系,唯一地定出了协变的軌道角动量算符在四維相对动量表象中的表示式和它的本征函数。在自旋1/2的粒子和光子的情况下,利用狄拉克方程和麦克斯威方程,定义了作为协变的总角动量組成部分的自旋算符,并求出了它們与协变的軌道角动量算符的耦合。对自旋0,1/2的粒子的散射和光致产生过程,作出了协变的分波分析,用四維不变量表出了不变振幅。通常的角量子数和质心系中散射角的余弦,現今換成了相对論不变的角量子数和始、末态中的四維相对动量(单位四維矢量)的标量积。非协变分波分析中质心系中的能量的作用,由四維总动量的模来代替。我們的結果消除了在利用分波分析研究散射过程时的角动量公式体系不便保持相对論不变形式的困难。

In order to consider the spatial property of a shock in a turbomachine correctly and in accordance with a three-dimensional steady transonic flow, the basic equations on the S1 and s2 stream surfaces in a four-dimensional "space" are derived through expanding the concept of the stream surface to the unsteady case. These equations will be valid for a three-dimensional unsteady flow, too. Applying the characteristics theory to the equations, the characteristic compatibility relations are obtained, and the...

In order to consider the spatial property of a shock in a turbomachine correctly and in accordance with a three-dimensional steady transonic flow, the basic equations on the S1 and s2 stream surfaces in a four-dimensional "space" are derived through expanding the concept of the stream surface to the unsteady case. These equations will be valid for a three-dimensional unsteady flow, too. Applying the characteristics theory to the equations, the characteristic compatibility relations are obtained, and the boundary conditions are established. These equations and boundary conditions with the proper initial conditions entirely define the problem of the transonic flows with shocks on the two kinds of the stream surfaces. Based on the steps of a complete method of solution for the three-dimensional flow suggested in this paper and using a suitable difference scheme the flow may be solved numerically.

为了正确处理叶轮机械中激波的空间性、求解跨声速定常三维流动,通过将流面概念推广到不定常流动的情况,本文推导出了在四维“空间”的不稳定流面和不稳定流面上的基本方程.它们对三维不定常流动,也是适用的.将特征线理论用于这些方程,得出了特征相容关系,并由此确定了定常流动中的边界条件.这些基本方程、边界条件,与适当的初始条件一道,完全确立了两类流面上带有激波的跨声速流动的定解问题.这样,再根据本文建议的三维流动完整解法的步序,选用合适的差分格式,便可数值求群了.

Some aspects of geostrophic adjustment are investigated by numerical experiment with nonlinear barotropic primitive equations in hemispheric area. The results are in good agreement with those obtained previously by both the linear and nonlinear theory. The characteristic time required for the adjustment process as well as the other quantitative data are given. The problem of four-dimensional assimilation is also discussed, indicating that it would not be of benefit, if the updating is made only in the...

Some aspects of geostrophic adjustment are investigated by numerical experiment with nonlinear barotropic primitive equations in hemispheric area. The results are in good agreement with those obtained previously by both the linear and nonlinear theory. The characteristic time required for the adjustment process as well as the other quantitative data are given. The problem of four-dimensional assimilation is also discussed, indicating that it would not be of benefit, if the updating is made only in the pressure field without treatment of wind field.

本文利用半球范围的非线性正压原始方程组的差分格式,对地转适应过程的一些问题作了数值试验,结果和以前的线性理论和非线性理论结果相一致,还给出了适应过程所需的时间等特征的定量资料。此外,丈中还模拟了四维分析问题,指出,只更新气压场而不同时对风场作更新或适当处理,是没有效果的。

 
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