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In accordance with discrete, non-symmetry and time-delay feedback neural networks, we provide some theoretical criteria to judge the stability for designing the networks. On continuous feedback networks, we built an algorithm to estimate the convergence region. On the HNN feedback networks, an effective optimization algorithm based on the annealing strategy and the chaotic neural network is presented, and some disciplinary conclusions are provided to guide the selection of parameters. Simulation results on benchmark problems demonstrate that the performances of our algorithm are distinctly superior to those of the classic HNN based on gradient descend and stochastic optimization methods based on probabilistic distribution.

针对离散、非对称和时延等三种类型的动态反馈网络,给出了可用于网络设计的稳定性判别准则;针对连续动态反馈网络,建立了其收敛域估计的一个算法;针对以HNN模型描述的动态反馈网络,基于退火策略和混沌神经网络提出了一种高效的优化算法,建立了可用于指导参数选择的一些规律性结论,对典型算例的仿真研究显示,改进算法在各类性能上相对基于梯度下降的传统HNN模型和基于概率分布的随机优化算法,具有明显的优越性。

By means of field test for the pile of 15 meters length and MARC finite element analysis, this paper studies the bearing mechanism of the reinforced mixing pile, analyzes the law of load transfer and the percentage about cement-soil ring and reinforced concrete core under vertical load, analyzes the change law and interactive behavior about the pile's surface bearing and end bearing. In the end an experiential equation that can be used in Tianjin area to estimate the bearing capacity of single pile is proposed on the basis of test researches and finite element analysis.

分析了劲性搅拌桩在竖向荷载作用下的荷载传递规律及芯桩与水泥土的荷载分担比;分析了劲性搅拌桩在竖向荷载作用下桩侧摩阻力和桩端阻力随桩顶荷载的变化规律;分析了劲性搅拌桩在竖向荷载作用下桩端阻力及桩侧阻力的发挥性状与桩土位移间的关系及端阻力与侧阻力的荷载分担比。

Some estimate that up to two thousand people were criminally prosecuted for participation in these events.

有人估计多达2000人被追究刑事责任的,在这些活动的参与。

When aiming for a distant target, the crossbowman can estimate using the Wang Shan on how high he should elevate his crossbow. The crossbow bolts fired would thus follow a parabolic path and hit the enemies accurately.

当瞄准远处的目标时,射手参照望山估算弩抬高的角度,弩箭沿抛物线轨迹就可以准确命中敌人。

Detailed studies are made as follows: Searching the key internal factors which can affects slope stability. According to the geological data which was gained by exploration investigation, establishing a geological model which can reflect rock mass characteristics;With analyzing the internal and exterior factors synthetically, the deformation and possible failure mechanism and mode of the cut slopes was confirmed which combines with stereoic projection and other techniques;The stabilities of the 14 high slopes are estimated synthetically by applicable design codes and guidelines. With the estimate result and some other analysis methods, the rock mass mechanical parameters of slope are identified;As a results, 14 high slopes fall into 4 categories based on rockmass characteristics and discontinuities. The stability and deformation of some typical slopes was analyzed with distinct element method by UDEC;The safety factor of some dangerous slopes are calculated by rigid limiting equilibrium method for coMParison.

首先着重研究影响边坡稳定性的内在因素,主要是通过地质勘探、测量、现场观测等手段取得研究区地质体的基础地质资料,建立起能够反映地质体结构特征的地质模型;随后综合分析潜在的内外部影响因素,并结合赤平投影对边坡可能的失稳模式或破坏机制作出判断;运用已有岩体质量分类方法对沿线14个高陡边坡稳定性进行初步的评价,并结合试验研究、经验判断、工程类比等手段确定了坡体的岩体力学参数;根据稳定性初步评价结果将研究区14个高陡边坡按开挖方式分为4大类,并利用离散元程序UDEC对各类典型高陡边坡进行了稳定性计算分析;对潜在危险边坡利用刚体极限平衡法求出了不同工况下的安全系数。

Combined with individual characters of special-area population,it is a great mission for Demology to apply the method of population estimate-indirectly creatively.

创造特殊区域的人口预测原理和方法是人口学工作者义不容辞的责任。

You estimate that it will initially cost $50,000 to renovate the place and buy Nautilius equipment for the center (there will be no salvage and the entire initial cost is depreciable).

您估计,它最初将成本5万美元翻新的地点和购买nautilius设备为中心(将不会有任何救助和整个初始成本是折旧)。

About the problem of hypothesis testing for the problem of estimate interval,first of all,we set statistic and the distributions of the statistic.Fron this ,we derivate the methods of testing.

对于点估计问题,讨论了估计的优良性质;对于区间估计问题,讨论了估计的精度;关于参数的检验问题,首先建立检验用的统计量及其分布,由此导出检验的方法。

The difference schema of the initial boundary value problem was converted to the step-by-step form,which was similar to the difference schema of the initial value problem.It is concluded that the difference schema satisfying the Von Neumann condition is a stable schema,and that,under the consistency condition,such stable schema is convergent.Moreover,with error estimate expression for the difference approximation to the classical solution,the linearity condition is unnecessary.

引入反投影算子将发展方程初边值问题的差分格式转化为与初值问题差分格式类似的逐步推进的形式,从而得出:满足Von Neumann条件的差分格式是稳定的格式;在相容条件下,差分格式若稳定(或满足VonNeumann条件)则格式收敛,且对古典解的差分逼近有误差估计式,不再需要线性的条件。

This paper considers the estimate of the upper bound of second eigenvalue for the differential operator with any order.

考虑了任意阶微分算子第二特征值的上界估计,获得了用第一特征值来估计第二特征值的上界的不等式,其估计系数与区间的度量无关。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力