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分界点    
相关语句
  dividing point
    meanwhile, the flexibly designing edge detection index means not only to get the maximum interlayer deviation quadratic sum, but also to differentiate the logs style at both sides of dividing point, thus improving the reliability of log strata division.
    同时,灵活设计边缘检测指标,优化准则不仅使层间离差平方和最大,也使各分界点两侧曲线形态差异尽量大,提高了分层可靠性。
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  dividing point
Taking the valley of the distribution curves as the dividing point, two height classes were apparent with a segregation ratio of 3 tall∶1 short, demonstrating this character to be under the control of a single recessive gene.
      
There appears to be a systematic variation in δO18 from the most S-type to the most I-type granites, the dividing point between the two occuring at δO18 equal to 10.
      
The diagrams are entered with "per cent of combined groups above dividing point" and difference between groups in their per cents above the dividing point.
      
This dividing point εL decreases with increasing coordination number.
      
By shifting the dividing point between the two parts of the period, we identified the point showing the greatest possibility of structural change.
      
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  demarcation point
Therefore, CV would not represent the demarcation point between heavy and severe exercise domains.
      
All piping connection from the demarcation point to the liquefied petroleum gas utilization devices shall be by others.
      
All tank final connections from the demarcation point to the tank dispensing point shall be provided by the LPG system supplier.
      
An entrance room has been provided as the demarcation point for telecommunications service providers.
      
As such, this is a logical demarcation point to terminate RF signals.
      
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  boundary point
On the modulus of continuity of the solution to the Dirichlet problem at a regular boundary point
      
The modulus of continuity of a solution at a regular boundary point is investigated.
      
The modulus of continuity of the solution to the Dirichlet problem is investigated for a second-order parabolic equation at a regular boundary point.
      
The boundary behavior of the higher-order Carathéodory metrics, the singular Carathéodory metric, and the Azukawa metric near anh-extendable boundary point of a bounded smooth pseudoconvex domain in ?n are studied.
      
We study the regularity of a boundary point assuming that in a neighborhood of this point the boundary of the domain is a surface of revolution.
      
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  the dividing point
Taking the valley of the distribution curves as the dividing point, two height classes were apparent with a segregation ratio of 3 tall∶1 short, demonstrating this character to be under the control of a single recessive gene.
      
There appears to be a systematic variation in δO18 from the most S-type to the most I-type granites, the dividing point between the two occuring at δO18 equal to 10.
      
The diagrams are entered with "per cent of combined groups above dividing point" and difference between groups in their per cents above the dividing point.
      
By shifting the dividing point between the two parts of the period, we identified the point showing the greatest possibility of structural change.
      
Generally, the horizontal distribution area acts as the dividing point between the two main cable types, horizontal and backbone.
      
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  其他


In this article, all definitions of pipe-string neutral pointmentioned in previous occasions and their mechanical properties are analyzed in detail. The relationship between the neutrl point, the axial zero-stress point and the neutral section is discussed. Answers are presented to such problems as whether the neutral point is the unstable demarcation point of the pipe-string while bent. This is beneficial to the correct understanding of the neutral point and its effect on engineering.

本文全面、详细地分析了历来的各种“中和点”定义和提法,对“中和点”的物理力学特性作了详细分析,对“中和点”与“零轴向力点”、“中性截面”间关系、“中和点”是否管柱弯曲失稳分界点等问题给出了结论。本文对于正确认识“中和点”概念及其在工程中的作用是有所裨益的。

The differential equation for lateral deflection of a tube is derived based on applied force,the condition for tubing buckling is presented and the concept of a neutral point is stated in analysing tubular buckling.Also,the expression for the neutral point of tubular buckling is given from the stress state of tubular buckling and the consistency for two types of buckling neutral points is analysed.

从液压状态下管柱宏观受力出发,导出了管柱弯曲的基本微分方程,给出了管柱发生失稳弯曲的条件,阐明了油井管柱分析中的中和点概念;从液压状态下管柱微观应力状态出发,推导了弯曲中和点的表达式,进一步明确了液压状态下管柱弯曲中和点应定义为管柱可能失稳弯曲与不可能失稳弯曲的分界点。分析了这两种弯曲中和点的一致性。

Determination of stratum boundary from well logs is the first step of facies analysis and stratum correlation among holes. Classical algorithm of determining boundaries from well logs is deviation analysis. In recent years many methods are proposed based on deviation analysis,such as optimum dividing algorithm of multi-well logs. In this algorithm targeted interval is taken as a system. The method requires that in each stratum the differences of the same kind logs should be the smallest,and in different stratum...

Determination of stratum boundary from well logs is the first step of facies analysis and stratum correlation among holes. Classical algorithm of determining boundaries from well logs is deviation analysis. In recent years many methods are proposed based on deviation analysis,such as optimum dividing algorithm of multi-well logs. In this algorithm targeted interval is taken as a system. The method requires that in each stratum the differences of the same kind logs should be the smallest,and in different stratum the difference the largest. This method is simple. But there are three defects in it. The first is the number of stratum boundary must be given in advance. The second is even if the number of boundaries is correctly given, the results may be unreliable. The last is this algorithm takes lots of compute time because ergodic method is used. Convergent condition of optimum dividing algorithm and heuristic search rules were proposed for avoiding false boundaries and reducing compute time. The convergence condition is based on montone non-decreasing function of dividing mean-square-sum sequence (defined as logging data dividing mean-square-sum sequence later).Whenever adding a new layer, compared to its maximum value, increment of mean-square-sum must be the minimum. And the ratio of the new added layers′ mean square-sum to its maximum should be proper. To avoid false formation and cut down compute time, three log curve patterns such as jump, gradual variation and peak are used to define search ranges of formation boundary point. Practical computations with the above algorithm are given.

简要回顾了应用测井资料根据方差分析原理反演地层界面的经典方法———多元测井数据最优分割算法。为了克服该算法存在的 3个缺点 ,给出了最优分割算法的收敛条件和避免给出假地层界面及减少计算工作量的启发式搜索规则。多元测井数据最优分割算法的收敛条件是基于测井资料分层过程中构造的均方和序列 (以下称测井资料分层均方和序列 )的单调非递减特性给出的。它要求每增加一个新地层 ,分层均方和的增量相对于其最大值要小到可以被忽略的程度。同时 ,要求新增地层的分层均方和与其最大值的比值要达到一定的程度。通过定义 3种曲线模式 :跳跃、渐变和峰来限定寻找地层分界点的搜索范围 ,从而避免了假地层的出现 ,同时也减少了计算工作量。给出了如上所述方法的实际计算结果

 
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