四维的

In order to prove the global asymptotical stability of the endemic equilibrium, we introduce the change of variable which can reduce our original four-dimensional system to a three-dimensional asymptotical autonomous system with limit system.

利用复合矩阵理论以及竞争系统的Poincaré性质排除了渐近自治三维系统的极限系统周期解的存在性，进而利用极限方程理论得到了原四维系统地方病平衡点的全局稳定性。

The key problem is to solve the display of four dimensional wavelet transform outputs.

提出光学子波并行处理的实现策略，主要有：阵列器件的组合、空分复用、图象缩放旋转与滤波器多楔多环之间的均衡等，其关键是解决二维输入图象子波变换输出的四维显示问题。

Part two introduces the content of Marcus Garvey's black nationalism from politics, economy, religion and culture aspects; on this basis, analyze its traits.

第二部分：从政治、经济、宗教、文化四个方面来分析加维的黑人民族主义思想的具体内容；同时，简要概括加维黑人民族主义思想的特点：综合性、群众性和非暴力原则。

Some properties of inversions are proved, It indicates that the inversion is conformal, the image of line of curvature is still the line of curvature of the inversion S of the hypersurface S, the principal curvature, the total curvature, and mean curvature of S are the functions...

在n-1维超曲面的反图变换中，示明反图变换为保角表示法，曲率线系的反影仍为反超曲面的曲率线系，反超曲面的主曲率，全曲率与平均曲率为原超曲面的主曲率的函数等。 3。最后导出公式(1)在四维空间与通常空间之特殊形式

The multidimensional measure, with quantitative and qualitative measures combined, may offset the void left by any singular unidimensional measure, either quantitative or qualitative in nature.

提出一个从组织创新的数量、速率、效果以及效率等方面综合评价创新能力的四维概念与度量模型，将传统的定量与定性指标结合在一起，突破了一维定量或定性测度的局限性。

Finally, the free vibration analysis of the 3-D beamlike lattice girders is performed using the derived property matrices of the 3-D Timoshenko beam elements and the influence of flexural rigidity, shear deformation and rotary inertia of the constituent structural members on the free vibration characteristics of the "triangular-type" and "rectangular-type" 3-D beamlike (Vierendeel and X-braced) lattice girders is studied.

最后，本文利用上述三维Timoshenko梁元素的性质矩阵，来进行三维构架的自由振动分析，并探讨各梁元素的挠曲刚度、剪切变形与旋转惯性，对三角形及四方形的梁形格状桁，自由振动特性的影响。

For those considering splurging on a commercial 3D or 4D ultrasound, the best expert to talk to is their own OB/GYN.

对于那些考虑splurging对商业三维或四维超声，最好的专家，谈的是他们自己的露天焚烧

Based on the real observation data, forecast equitation or forecast model, the dynamics method such as divergence and vorticity calculation, real data correction, ascending and subsidence calculation was used to simulate the 4D field of divergence, vorticity and vertical velocity at different time, different range and different levels. The field was connected to 3D fields of insect trajectories, yielding the flying speed, direction, ascending area and subsidence. Thus the peak of immigratory insect could be timely monitored. A system of the peak of immigratory insect forecast was set up.

根据实际观测资料、数值预报方程或数值预报模式等输出的风场网格化处理结果，利用运动学方法、散度推算法、涡度推算法、实际资料订正法、升降法等对不同时间、不同范围、不同层次的四维散度、涡度和垂直运动速度场进行计算或模拟，将计算或模拟得到的散度场、涡度场、垂直运动速度场与昆虫迁飞的三维气流场联系起来，得到该类昆虫所具有的迁飞速度、方向、上升区和下降区，从而对昆虫的迁入峰进行实时预警。

Debuting in fourth place with $12.5 million was Universal's "The Fourth Kind," starring Milla Jovovich as a psychologist studying alien abductions in Alaska.

排在第四位的是一千二百五十万美元的&环球&的&第四类&，由米拉#乔沃维奇主演，作为一个研究外星人绑架的阿拉斯加的心理学家。

In chapter 8, the complex of n-dimensional and geometry models of n+2 points are analyzed. The algorithm of high dimensional Delaunay triangulation is discussed.

第八章以四维空间为例分析了n维空间的单纯体构造和n+2个点的空间几何构型，探讨了高维空间的Delaunay三角化算法。

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。