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LFY-like genes play important role in plant development, when they were first isolated from mutants of Antirrhinum and Arabidopsis, they were thought to be "SAM-specific-determinating-genes", regulating the transition from inflorescence to flower meristem. However, further research revealed that LFY-like

LFY类基因在植物形态建成过程中具有重要作用,根据其突变体的特征,曾一度被认为是在花分生组织和花序分生组织中特异表达的"分生组织特征决定基因",控制花序分生组织向花分生组织的转变。

Algorithm application of neural networks.Ⅲ Implementation of neuro-computers. The main contribution of the dissertation can be summarized as follows: 1 Hopf bifurcation of three kind of neural networks are discussed in detail, including type of discrete time delay, type of time delay with weak kernel and strong kernel as well as the proof of existence of bifurcation. Other problems such as asymptotic stability of bifurcation periodic solution, algorithm of determining the bifurcation direction, asymptotic stability and style of periodic solution are also studied. The average time delay is chosen as the bifurcation parameter, phenomena pertinent to system states of the continuous time delay network with strong kernel evolving from stable to oscillating, then back to stable again are observed.

论文的主要创新之处可以归纳如下: 1)针对目前国内外对神经网络的分岔研究较少的情况,论文中详细讨论了带离散时延神经网络、带弱核的连续时延神经网络、带连续分布时延且具有强核的神经网络的Hopf分岔现象,从理论上证明了Hopf分岔的存在性,并研究了分岔周期解的渐近稳定性,得到了确定周期解的渐近稳定性、分岔方向、周期解的渐近形式的算法;用平均时延作为分岔参数,发现带强核的连续时延神经网络中存在着系统的状态由稳定变化到振荡现象,当继续增加平均时延参数时,又从振荡变为稳定这一特殊的动力学现象。

In order to reasonably depict four basic problems with friction, one Coulomb friction new form in first Kirchhoff stress is proposed to deal with finite deformation problems, other Coulomb friction form in incremental mode to elastoplastic flow theory; Hilbert function spaces concerning elastoplastical problems with friction are established, so it makes all operations and calculations in the treatise standardized within the scope of reasonably topologic structure; In view of functional extremum, the equivalence between generalized variational inequalities principles in elastoplasticity with friction and corresponding basic problems are testified by inducing Lagrangian multipliers, so it provides a rationally theoretical basis for numerical methods in elastoplasticity with friction; From the viewpoint of variational inequality, the theory of generalized variational inequalities in elasticity and elastoplasticity with frictional constraint is studied, and the uniqueness and existence of the solution of FEM is proofed under the proposed conditions of stress compatibility, and them FEM approximation and a discrete solution are discussed; Based on the principles of generalized variational inequalities in elastoplasticity with friction, direct generalized variational inequalities methods is pretended, which is a natural generalization and development of direct variational methods; Using generalized variational inequalities methods, some examples in metal forming including plane deformation, upset and extrusion are analyzed and the results prove that all the theories and methods in the paper are right, feasible, accurate and advanced.

主要内容有:为了合理地描述金属塑性成形中摩擦约束弹性、弹塑性基本问题,提出和研究了有限变形下以Kirchhoff第一应力表示的Coulomb摩擦定律形式和弹塑性流动理论下以增量形式表示的Coulomb摩擦定律表示形式;系统建立了摩擦约束弹塑性问题的Hilbert函数空间,使本文规范在一个具有合理的代数拓扑结构内进行一切操作和运算;利用Lagrange乘子,从泛函极值的角度系统地阐述和论证了一系列摩擦约束弹性、弹塑性广义变分不等原理与相应的实际问题之间的等价性,它为处理摩擦约束的弹塑性力学数值方法提供了合理的理论基础;从变分不等式的角度出发,阐述了对应于摩擦约束弹性、弹塑性问题的广义变分不等式理论,首次提出了在应力相容性条件下,它的有限元解具有存在唯一性,进而讨论了其有限元近似及离散解法;基于摩擦约束弹塑性广义变分不等式原理,首次提出了直接广义变分不等式方法,这一方法是直接变分法的合理推广和发展;利用直接广义变分不等式方法对金属压力加工中的平面变形问题、镦粗、挤压等塑性成形问题进行了分析计算,验证了该理论和数值算法的正确性、实用性、精确性和优越性。

This article used the method of the Spearman rank correlation coefficient analysis to research on the correlation dependence of the league tournament rank to the physical shape and the technical statistics during 2005-2006 CBA regular season. It has beenshown that physical shape has less correlation with and percentage of shots of three-pointers, percentage of shots of penalty, losing point, rebound of the back field and the turnovers have most correlation with league tournament rank. The major factors that determine the amount of net scores in games the percentage of shots of three-pointers by better teams may have greater effects in the league tournament rank.

采用Spearman等级相关系数分析法,对2005-2006赛季CBA常规赛各队身体形态指标和技术统计指标与联赛名次的相关关系进行了研究,分析结果显示:CBA身体形态指标与常规赛的名次之间没有较高的相关性;CBA常规技术统计中3分命中率、罚球命中率、失分、后场篮板球、失误对比赛的名次影响具有显著性;常规赛23项技术指标中总投篮命中率、3分投篮命中率和3分投篮命中次数是决定比赛净胜分多少的主要因素,且水平越高的球队3分投篮命中率对比赛净胜分的影响越大。

It was anticipated that more than 50% of ash and the hazardous elements As, Co, Cr, Cu, Hg, Mn and more than 30% of sulfur in most coal would be routinely removed by physical coal cleaning procedures, however, the removability of other hazardous elements Ba, Be, Cd, Cl, Mo, Ni, P, Pb, Sb, Se, Th, U, V and Zn displayed relatively lower or a wide range of variation.

结果表明:物理洗选不但能降低煤中的灰分与硫分,还能不同程度地脱除煤中有害微量元素;预测在物理洗选过程中,多数煤中灰分以及有害微量元素As、Co、Cu、Cr、Hg与Mn的脱除率大于50%,硫分的脱除率大于30%,其它有害微量元素Ba、Be、Cd、Cl、Mo、Ni、P、Pb、Sb、Se、Th、U、V与Zn的脱除率相对较低或表现出一个宽的变化范围。

The research work consists of two aspects:the relationship between fluorine in coal and ash,mineral composition;organic affinity and washability of fluorine in coal.

研究内容包括:煤中氟与灰分、矿物成分之间的关系;煤中氟的有机亲和性与可选性;研究结果表明:煤中氟质量分数与灰分质量分数之间呈正相关关系;中国煤中氟质量分数与灰分之间存在以下指数增长关系;煤中氟质量分数与煤中矿物质的成分有关;煤中氟属"中等无机型"元素,无机亲和力较强,有机亲和力较弱;煤中氟以无机氟为主,有机氟为辅的方式赋存;原煤洗选是脱除煤中氟的一种可行的技术措施。

Rough error processing that frequently used to digital filtering was taken as the research object,on the basis of difference method commonly used in the past and profile method of fractile method,a synthesis algorithm-fractile method based on difference method was proposed.The algorithm for processing the rough error data was perfected .The method had been used in a detection system and result is satisfactory.

对数字滤波系统中经常使用的数据处理算法做了综合处理,对于数据采集过程中所得数据做粗差判断处理为主要研究对象,在过去常用的差分法和分位数分布图法的基础上提出了一种综合处理方法-基于差分法的分位数方法,对系统中的粗差数据处理算法做了更完善的探讨,该方法已在实际检测系统中应用,效果显著。

Customer segmentation is a critical step to the success of target or segment marketing. The effectiveness of customer segmentation depends on a good number of variables such as customers' demographic, behavioral, geographic, and psychographic characteristics. However, the huge combinations and correlations among variables make customer segmentation a challenging task, even with the aids of information technologies. The industry is desperate for effectual and powerful tool for excavating customer knowledge from the large accumulated data in the corporate database management system.

摘要顾客分群对於目标行销或市场切割的成功与否都是一个重要的关键步骤,顾客分群结果的优劣取决於其所采用的分群因子,顾客分群中常使用的分群因子有顾客的人口统计资讯、行为特徵、地理性资讯与心理方面的特徵等,然而,这大量与因子复合交错的资讯使得顾客分群成为企业的一个挑战,并且渴望寻求一个能够从大量累积的资料库系统中挖掘知识的工具。

After examination, we anatomised rats and gotliver tissues for pathologic checkout. There are 7 cases scoring 3 and 2 cases scoring2 in A group; 4 cases scoring 2 and 5 cases scoring 1 in B group and 9 cases scoring 1and 1 cases scoring 2 in C group.

检查完毕后解剖大鼠取肝组织送病检。A组中有7例评分为3分,2例2分;B组有4例评分为2分,5例评分为1分,C组中9例1分,1例2分。

Equidistance point and difference theory in theory of function approximation are studied. Meanwhile, the relation among difference, difference quotient and derivate is revealed. By drawing Lagrange's and Cauchy's theorem of mean on difference and Taylor's formula into difference function, four theorems, such as Lagrange's theorem of mean on difference, are concluded in simple way. On the basis of these conclusions, the asymptotic property of middle point is studied, a series of new conclusions are drawn and the discussions on the asymptotic property of middle point in differential mid-value are summarized.

对函数逼近论中等距节点和差分理论进行了研究,揭示了差分、差商与导数之间的联系;将Lagrange中值定理、Cauchy中值定理、Taylor公式引入到差分函数中,简明地推导出Lagrange差分中值定理等4个定理,并在此基础上对&中间点&的渐近性进行了研究,得出了一系列&中间点&的渐近性的结果,概括了有关文献对微分中值公式的&中间点&的渐近性的讨论;给出的引理改进了函数逼近论的证明方法,精简了函数逼近论中的一些内容。

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推荐网络例句

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。

When I was in school, the rabbi explained everythingin the Bible two different ways.

当我上学的时候,老师解释《圣经》用两种不同的方法。