查询词典 first derivative

The first rank derivative is a reflection of curve change and its rate, at certain range, if the sign of the first rank derivative has changed, the logging value of the correspondence depth point means maximum in this range; the second rank derivative is the knaggy property reflection of curve, at certain range, if the sign of the second rank derivative has changed, the correspondence depth point represent the inflexion of geophysical logging curve, it＇s also a turning point of the reflection of knaggy change property of the curve, it is the interface of stratum.

测井曲线的值是深度的函数，测井曲线的一阶导数表示了曲线变化的趋势和变化的快慢，在某一范围内，当一阶导数呈现符号转换时，相对应的深度点的测井值即为该范围内极大值；测井曲线的二阶导数则表示曲线的凹凸性，在某一范围内，当二阶导数呈现符号转换时，相对应的深度点代表了测井曲线的拐点，即反映曲线凹凸性变化的转折点，亦即地层的分界面。

The key of the algorithm is how to estimate the derived vector of the surface curve or the first derivative of the surface of revolution according to the given length or area constraint.

算法的关键在于如何利用已知的弧长或面积约束来估计空间曲线或旋转面的旋转曲线在节点处的导向量或一阶导数值。

It also testifies the intermediate variate in the system is servo valve loading pressure; compensator is a first derivative element.

可以证明本系统的这种观测量是伺服阀的负载压力，而所谓补偿器是一个一阶微分环节，因而容易实现。

First derivative spectrophotometric method for determining of micro samarium in electroplating solution is given,using xylenol orange as color reagent.

提出了利用二甲酚橙为显色剂测定电镀液中微量钞的一阶导数分光光度法。

The result shows that single linear regression model with the first derivative reflectance spectra in 683 nm can accurately predict SPAD values.

结果表明，684 nm处一阶微分光谱的线性回归模型可较好地预测油菜叶片的SPAD值，预测样本的相关系数达到0.801。

Potassium Guaiacolsulfonate ; syrupus phenergani tussis ; first derivative spectrophotometry

愈创木酚磺酸钾；非那根止咳糖浆；一阶导数分光光度法

The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time.

瞬时速度：当运动时间小到可以忽略时，此商数的极值；距离相对于时间的一阶导函数

It will discuss the algorithm from three parts:(1) disparting theselected points;(2) how to find start point and end points first derivative (3) thealgorithm which forms the curve.

本文将主要从3个方面进行论述这一算法：(1)对选定点的纵横划分；(2)划分后端点一阶导数的确定方法；(3)形成曲线的数值方法。

Based on the first derivative value of band at sensitive wavebands, the linear function model was established. R^2 of 0.7818 and 0.5899. This research shows that chlorophll in formation of reflecting apple growing status can be preciously obtained by using hyperspectral remote sensing.

基于敏感波段的微分数值；建立了一阶微分光谱值与苹果叶片SPAD值和叶绿素含量的回归模型；确定系数分别达到0.7818和0.5899；为利用高光谱遥感技术反映苹果生长状况的叶绿素信息提供了依据。

In the case that the oscillation factor isn't sign reversal and neutral factor is p, by discussing the sign of the neutral term's first derivative and using Holder inequality the oscillation conditions of the all solutions of this kind of equation are studied, three sufficient theories that all solutions of the equation oscillate are obtained.

在振动因子q保号、中立型因子p的情况下，通过对中立型项一阶导数符号的讨论，根据Holder不等式，研究了该类方程的解振动的条件，得到了所研究方程所有解振动的三个充分性定理，所得结论是对该类问题已有结论的进一步完善和推广。

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。