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In this paper, we prove that if Ф is parallel and A+G+μB=0 for some functions λ,μ, then Ф=0, which gives the classification of the hypersurfaces in S(superscript n+1) with parallel Mbius form and A+G+μB=0 from the classification theorem in paper of Li H.
本文证明了如果x的Mbius形式Ф平行,并且A+λG+μB=0,其中λ,μ分别是定义在M上的光滑函数,那么Φ=0,由此及李海中、王长平(2003年)文献中的分类定理给出了S(上标 n+1)中具有平行的Mbius形式及满足A+λG+μB=0的超曲面的分类。
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Based on the analysis of the single-ring resonator, both the transfer functions of parallel-coupled structure and the ones of series-parallel structure in multiple-ring high order resonators are derived using the transfer matrix method. And the influences of the length of straight waveguide between rings, coupling coefficients between rings, coupling coefficient between straight waveguides and ring, the number of rings and the radii of rings on spectral response are also analyzed. Spectral response at drop channel with maximally flat response pass bands and sharper roll-off could be achieved by optimizing these parameters, so as to improve the performance of output spectral response.
在分析单环结构的基础上,利用传输矩阵法,推导了多环并联和多环串联两种耦合结构的高阶谐振器的传输函数公式,分别分析了并联环间直波导的长度、串联环间耦合系数、环与直波导间的耦合系数、环个数和环半径对相应结构输出特性的影响,通过优化这些参数实现下话路输出光谱具有通带的最大平坦性和过渡带良好的滚降特性,从而达到改善其输出光谱特性的目的。
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The complete pseudo-umbilical submanifolds with parallel mean curvature vector in constant curvature space;2. In this paper,the pseudo-umbilical submanifolds with parallel mean curvature vector in pseudo-Riemannian manifold is discussed.
研究了伪黎曼流形中具有平行平均曲率向量的伪脐子流形,Npn+p为n+p维完备连通伪黎曼流形,它的截面曲率KN满足a≤KN≤b,Mn为Npn+p中紧致的具有平行平均曲率向量的伪脐子流形。
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In the second part of this paper, by considering the geometric properties of some well-known classical Riemannian manifold and combining with results we had got, we give the definition of the parallel rays in a complete nocompact Riemannian manifold M, which are usual parallel rays when M is restricted to Euclidean space R.
本文的第二部分,基于对一些典型的黎曼流形几何性质的观察,结合已有的研究成果,我们首次给出了完备非紧黎曼流形上平行射线的定义,该定义在欧式空间中就是普通的平行射线。
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The paper first discusses the programming principles of how to exploit the parallelism underlying in sequential programs with the Parallel Programming Interactive Environment, explains the designing methods of the major functions and tools integrated in the PROFPAT (the PROgramming environment for the Fortran PArallel Transformer), and demonstrates its initial application process by the practice of interactive dependence analysis, loop parallelization, array privatization and unimodular transformation.
首先,本文从理论上深入探讨了如何借助并行程序设计交互环境帮助程序员分析和利用潜藏于串行程序中的并行性的原理,详细介绍了并行程序设计环境PROFPAT中集成的主要功能和主要工具的设计实现方法,并结合交互相关性分析、交互循环并行化变换、交互数组私有化变换、交互幺模变换等程序并行化分析、变换的初步应用实践,说明了这些工具和功能的应用方法。
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On the basement of conventional direct fan-beam reconstruction, this paper gives a newly improved algorithm-"fast filtering-backprojection". This method utilizes the symmetrical circle geometry to sample projection data, and reconstructs image on the Polarcoordinate firstly, then translates this reconstructed image onto the cartesian coordinate system with two interpolating operations so that the computer can show the result image on the VGA screen. This algorithm rebates the calculating backprojection greatly, and shortens a few times of reconstructing time than same kinds of means. With the size of image enlarging, the reconstructing time abates with 2 exponent times. In addition, according to the idea of parallel-beam, we rearrange the fan-beams and reconstruct image using parallel-beam method fastly. The rearranging constraint condition is given here.
本文首先在传统的扇束直接重建方法的基础上,提出了一个改进的快速滤波反投影重建算法,它利用旋转采集投影数据的圆周对称的几何关系,先在极坐标系统内进行图象的重建,然后通过两次内插运算再将图象转换到计算机显示方式下的笛卡尔坐标系中去,该方法将以往的直接重建方法中的反投影时所需的运算大大降低,并将重建时间比同类方法缩短了几倍,而且随着重建图象的尺寸的增大,重建时间以2的指数次方倍相对缩短,并获得了较好质量的重建图象;另外,又根据平行束投影重建图象的思想,对扇形射束进行了重排,然后利用平行束重建图象的方法进行扇束的重建,并推导了&扇束重排重建图象&方法的约束条件。
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The following are the results: 1. An abstract meteorological phase parallel model for numerical weather prediction is developed as follows:〓 In this equation, parallel wall clock time related with computing grid numbers, load imbalance, communication and synchronization overhead is given out. It can be used to design and analysis the parallel algorithm.
该研究工作的主要结果如下: 1 发展提出了一个适用于气象数值预报模式的阶段并行模型MPPM:〓它表明了并行计算时间与数值模式的计算格点量、负载平衡因子、通信开销、同步开销及并行开销等之间的关系,为设计和分析数值预报模式的并行算法提供了理论依据。
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The results show that the methane drainage quantity from the bores perpendicular to face cleat was 1.2 times that of the bores parallel to face cleat in any time and the difference between them becomes more distinct with the drainage time increasing. In the research area, the bores perpendicular to the face cleat was 2.61 times that of the bores parallel to face cleat in maximum drainage quantity and 4.34 times that in drainage effect, and the reasonable time is about 300 days.
结果表明:垂直面割理方向钻孔的抽放量在任何时刻都明显高於平行面割理方向钻孔的抽放量,抽放时间越长,两方向抽放量之间差距越显著;研究区垂直面割理方向钻孔的极限抽放量是平行面割理方向钻孔的2.61倍,抽放率高出4.34倍,合理抽放时间在300d左右。
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The design of enhanced parallel port driver and data exchange program used for portable PC on oil tank floor inspection device were introduced.The EPP driver module was developed with WinDriver tool in kernel mode in response to parallel port interrupts,read and buffer port data.
介绍了用于储罐底板检测器上位机的增强并口驱动和检测数据中转程序的设计,该程序借助WinDriver驱动增强并口,即响应并口中断、读取和缓冲数据。
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The new rT joint not only has two rotation axes that intersect at right angle,but also has another rotational degree of freedom which can be used to modify the assembly of other joints.This can change the mobility of the parallel mechanisms that assembled with the new rT joints and leads to two types of metamorphic paralllel mechanisms:In the first type,the mechanism changes its topology by turning the new rT joints in all limbs into different configurations which reconfigures the constraints within the limbs or the assembly of all the limb constraints.This change of mobility is completed by two cases.One is illustrated by a 3PS and a 3C parallel mechanism,by altering the rT joint into different configurations there will produce or reduce local degrees of freedom and thus change the constraits to the moving platform.This qualifies the 3PS and 3C to have variable mobility from 3 through to 6 and from 1 through to 6 respectively.
该铰链除了一般Hooke铰的两个轴线互相垂直相交的旋转自由度外,还增加了一个可以调节该两个轴线之一的姿态的一个旋转自由度,通过此自由度调节该rT铰到不同的装配构型,可以改变用其装配的并联机构的自由度,由此产生两类新型的并联变胞机构:一类是机构的各个支链中都有rT铰,该铰链的不同构型可以改变各支链对运动平台的约束或整个支链组的组合形式而改变机构的自由度状态,3PS和3C属于前者,通过调节rT铰到不同构型可以使其支链产生或消失局部自由度,从而减少或增加支链对运动平台的约束,使得并联变胞机构3PS和3C分别具有自由度从3变到6和从1变到6的能力;3P属于改变支链组组合形式的机构,其rT铰的不同构型将改变整个支链组的几何约束组合,使得并联变胞机构3P可以有三转动、三平动或三平移(来源:ABCded9de论文网www.abclunwen.com)一转动的自由度形式。
- 推荐网络例句
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We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.
索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称;三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起,称之为挽歌体诗人或者史诗诗人,他们被称为诗人,似乎只是因为遵守格律写作,而非他们作品的模仿本质。
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The relationship between communicative competence and grammar teaching should be that of the ends and the means.
交际能力和语法的关系应该是目标与途径的关系。
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This is not paper type of business,it's people business,with such huge money involved.
这不是纸上谈兵式的交易,这是人与人的业务,而且涉及金额巨大。