反旋

In chapter I, we introduce the Jordan-Wigner transformation in detail, and illustrate its applications with three examples: the one-dimensional S = 1 XXZ model; the bilinear-biquadratic SU(2) invariant S = 1 chain; and the ionic Hubbard chain in the strong coupling limit. In chapter II, we review the S = 1/2 transverse Ising chain in detail.

在变换后发现隐藏在自旋为1的系统里自旋为1/2的SU(2)对称性及广义的U(1)规范对称性；(3)通过将推广的强耦合极限下的一维离子型Hubbard 模型变换为SU(3)反铁磁Heisenberg 模型，严格论证了离子型Hubbard 模型从能带绝缘体到莫特绝缘体的转变区域中自发二聚化绝缘体铁电性相即键序波相的存在。

First, UWPBL model(The University of Washington Planetary Boundary Layer Model) is used to retrieve typhoon's sea level pressure from sea surface winds data of SeaWinds which aboard on QuikSCAT and these strength results are analyzed. Then the variational method is applied to decompose the sea surface winds field into two parts: the vortex and irrotational environmental flow field, the UWPBL model is used again to retrieve ShanShan and YaGi typhoons' sea level pressure from the vortex flow field, the results of typhoon's central positions are analyzed by comparing the results with the results of direct retrieving, NCEP's data and typhoon annual reports. It turns out that the accuracy of the typhoon's sea level pressure central position has been obviously improved, This method offers a new idea for the study of typhoon from microwave scatterometer data.

本文首先利用QuikSCAT散射计获取的海面风场资料，利用华盛顿大学行星边界层模式对台风海平面气压场进行反演，并对其强度进行了分析；然后对获取的海面风场，采用变分方法对风场进行分解，分解出无旋和有旋风场，对分解出的有旋风场，再利用UWPBL模式对珊珊和魔羯台风的海平面气压场进行了反演，对所得结果与通常直接反演、NCEP海平面气压场及台风报文资料进行一一对比，结果表明：新的反演定位的方法对台风海平面气压场中心气压的定位精度有了大幅度的提高，此种定位的方法为散射计资料在台风中的实际应用开辟了一条新的思路。

In this article, based on one-dimension Heisenberg model, the unsymmetric bilayer ferromagnetic and antiferromagnetic thin films are investigated by using the interface rescaling approach under nonperiodic boundary condition.

本文以海森伯模型为基础，只考虑最近邻相互作用，在计入外磁场和非周期性边界条件下，应用界面重参数化方法，分别研究了由A、B两层组成的铁磁或反铁磁层间耦合薄膜中的自旋双链系统的界面自旋波及其存在的充分必要条件，重点讨论了体各向异性场和自旋链长度对界面自旋波存在条件的影响。

On the condition that the primary optical axis of the seeker was fixed to the missile top, the expressions of imaging compensation were educed by analyzing imaging laws of the moving target relative to the rotating seeker. An estimation algorithm based on the coupling image was used to realize real-time tracking for the angle velocity. After discussing some relative problems such as glint and fabric noises, a filter based on wavelet decomposition and weighted smoothness was utilized.

通过分析目标相对于旋转导引头的成像规律，推导出图像反旋补偿的公式，研究了基于图像的角速度估计算法，实现了对自旋角速度的实时跟踪；同时对成像过程中产生的闪烁噪声、抖动噪声等进行了分析，并在角速度跟踪时，采用基于小波滤波与加权平滑的方法进行去噪处理。

The first element, constructed of a stiff material benefits anti pronation, anti supination and anti torsion.

第一个因素，建造了激烈的物质利益的反旋，反旋和反扭。

Stress, strain rate and velocity distribution in billet of forward tube spinning and backward tube spinning were solved by applying this simulation system.

应用所开发的模拟系统对筒形件强旋进行了有限元分析，求得了正旋、反旋时毛坯中的应力、应变速率及流动速度分布。

In order to obtain actual preferred principle of processing parameter about three-roller backward spinning of tube,nonlinear FEA software ANSYS/LS-DYNA is,carried on 3D dynamic simulation,stress analysis and strain analysis to three-roller backward spinning of tube under different processing parameter.

为了确定更为符合实际的筒形件三旋轮强力反旋工艺参数的选用原则，利用大型非线性有限元软件ANSYS/LS-DYNA对不同工艺参数下筒形件三旋轮强力反旋旋压过程进行了动态模拟和应力应变分析。

In this paper, based on nonlinear FEA software ANSYS/LS-DYNA, 3D dynamic simulation models of eighteen-type tubes for backward spinning was established. This paper not only obtained spinning force of tube backward spinning but also obtained the spinning force curves varying with the different reducer ratio, feeds, fillet radius for spinning roller, forming angle and diameter of spinning roller, and diameter blank inner.

以大型非线性有限元软件ANSYS/LS-DYNA为分析平台，通过对18种几何尺寸和参数不同的筒形件三旋轮强力反旋旋压过程的三维动态模拟，得到了它们的旋压力以及旋压力随不同减薄率，旋轮进给量，旋轮圆角半径，旋轮成形角，旋轮直径和毛坯内径的变化曲线。

Recently, the study on the QCD phase structure is extended to finite isospin density.

近年来，对QCD的研究已经扩展到有限同位旋密度的范围，而研究QCD在有限同位旋密度下的性质对调查致密星体、同位旋反对称核物质以及中能的重离子碰撞都有重要的意义。

It according to rotates divides into the positive rotation for the direction and the semi finished materials material flow direction similarities and differences and instead turns on lathe, including turns on lathe, the stable spinning and finally turns on lathe three stages.

其按旋轮进给方向与毛坯材料流动方向的异同分为正旋和反旋，包括起旋、稳定旋压和终旋3个阶段，成形中的工件可划分为3个区域，即未成形区、成形区和已成形区，材料所受到的应力、应变在不同阶段也具有不同的特点。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。