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Therefore this work aims to apply the concepts of near-net-shape forging to the forming of hexagonal bolts. FE software DEFORM 3D was utilized to simulate and verify the proposed forming schemes to achieve this end.

因此本研究导入近净形锻造的观念於六角螺栓的成形加工,以达到无废料的理想,並以金属成形的有限元素DEFORM 3D软体进行模擬,探討可行之近净形设计。

A mathematical relation model between liquor near infrared spectrum and liquor alcoholicity was established by use of the combination of discrete cosine transformation and BP neural networks, which was a new approach for rapid liquor alcoholicity determination.

采用近红外光谱的离散余弦变换和BP神经网络相结合,建立了白酒近红外光谱与其酒精度之间的数学关系模型,为快速检测白酒的酒精度提供了一种新的方法。

The Haiyuan earthquake relates to both NS and EW structures extending to the top of the asthenosphere and the movement of the material of the asthenosphere.

海原大地震的发生既与延至软流层顶部的近NS向和近EW向的构造有关,也与软流层的物质活动有关。

They also pointed out some asymptotic properties of the sequential estimation, such as asymptotic consistency, that is P ,and asymptotic efficiency, that is .

最近,A.Dmitrienko(2000)在构造极大似然估计的序贯置信区域时,提出了一个新的渐近性质:未知代价的有界性,即这是一个很值得考虑的渐近性质。

Then, followed the analysis of the asympototic properties of maximum likelihood estimation for the seasonal ARFIMA models, the consistency, efficiency and asymptotic normality of the Bayesian estimator are proved.

参照季节性ARFIMA模型的极大似然估计的渐近性质的证明思路,证明了模型参数的贝叶斯估计具有相合性、有效性和渐近正态性。

Basing on this, the formal asymptotic expansion of solution for the original problem is obtained. Finally, under suitable conditions, existence and its uniform validity of asymptotic expansion of solution for the initial boundary value problem are proved,by using theory of differential inequalities.

在这基础上得到了原问题解的形式渐近展开式;最后,在适当的条件假设下,利用微分不等式理论,证明了原初边值问题解的存在性及其渐近展开式的一致有效性。

Secondly, a asymptotic approximation formula of structurefailure probability is presented in generalized stochastic space with correlatedrandom variables by the asymptotic method of Laplace integral, by which the failureprobability and risk analysis on the chamfered vertical breakwater have been done.

其次,利用Laplace型积分的渐近计算方法,还推导出了广义随机空间相关荷载变量作用下结构失效概率的一个新的渐近计算公式,并依此算法对削角直立堤进行失效概率的计算以及风险评估。

This paper consists of three parts: Firstly, we discuss a nonautonomous -species two-patches cooperative Lotka-Volterra diffusion system. Using Brouwer fixed-point theory and Liapunov function, under some conditions, we obtain that the system has a unique globally asymptotically stable positive periodic solution. Secondly, we consider a kind of nonautonomous predator-prey model, in which preys are with stage structure and the predator are with two patches.

中文摘要:本文分三部分讨论三类生态模型周期解或概周期解的存在性及全局渐近稳定性等内容:第一部分讨论了两斑块种群的互惠Lotka-Volterra扩散系统,运用不动点理论和构造Liapunov函数,得到了系统存在唯一一个全局渐近稳定的正周期解的充分条件。

Since 1980 the river net pattern began to show typical features of artificial river system with straight watercourse, low curvilinearity.

近百年来扬中的渠网系统发生了显著变化。1935年和1958年河港为近于自然树枝状水系。1980后河港格局表现出典型的人工水系特征,到1994年河港数量和长度明显增加,网络的结构趋于复杂,河港网络趋于完善,但城镇及其附近的渠道和池塘逐渐减少。

Corolla white, often with a deep pink-red or yellow throat, tube cylindric or nearly so; fruit subglobose

花冠白色,通常具一深的粉红色的红色的或黄色喉,筒部圆筒状的或近如此;果近球形 18 Cerbera 海芒果属

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Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来,英国,在此地早期居住的是凯尔特人,已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。

The almost sure central limit theorem is a pop topic of the probability research in recent years,because it has many actual applications in the random analogue.

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