1) mixed derivative
混合导数
1.
An indirect constructing-difference-scheme method,called the method of the reduction of order,is proposed for numerical solution to Neumann problem of elliptic differential equations with variable coefficients and mixed derivatives.
本文对于含混合导数的变系数椭圆型微分方程 Neumann 问题提出了一种间接构造有限差分格式的降阶法。
2) mixed partial derivative
混合偏导数
1.
At the same time we studied the exchange order theorem of its two second order mixed partial derivative.
应用函数列的极限与函数的极限交换次序定理,研究了二元函数的二重极限与它的两个累次极限的关系定理,研究了二元函数的两个二阶混合偏导数可交换次序定理。
2.
A further research is made on the two mixed partial derivatives of the binary function and comes to a full condition for their equality,which is weaker than the condition given in [1].
对二元函数的两个混合偏导数fyx(x,y)及fxy(x,y)进行了进一步研究,并得出了它们相等的一个充分条件,该条件比[1]中给出的条件更弱。
3.
When discussing whether the second mixed partial derivatives f″ xy (x,y) and f″ yx (x,y) have something to do with the sequence of derivation,most textbooks of mathematical analysis reach the conclusion that they have nothing to do with the sequence under the condition that they are continual.
大多数数学分析教科书讨论二元函数的二阶混合偏导数f″xy(x ,y)、f″yx(x ,y)与求导次序有无关系时 ,都是在其连续的情况下得出与次序无关的结论的 。
3) mixed partial derivative of higher order
高阶混合偏导数
4) second mixed partial derivative
二阶混合偏导数
1.
In this article,we have provided and proved a sufficient condition of the existence of generalized second derivative,meanwhile,we have discussed the relations between generalized second derivative and second mixed partial derivative of bivariate function.
给出并证明了函数在一点处广义二阶可导的一个充分条件,分析了二元函数在一点的广义二阶导数和二阶混合偏导数之间的关系。
5) theorem of mixed partial derivative equity
混合偏导数相等定理
6) mixed conductor
混合导体
1.
Synthesis and electrical properties of La_(1.9)Sr_(0.1)Ni_(0.9)Cu_(0.1)O_(4+δ) mixed conductor;
La_(1.9)Sr_(0.1)Ni_(0.9)Cu_(0.1)O_(4+δ)混合导体的合成与导电性能研究
2.
03O_ 3-y is a mixed conductor of oxide ion and electric hole at the temperature from 600℃ to 1 000℃.
03O3-y都是一个氧离子与电子空穴的混合导体。
3.
The experimental results about the relations between the electronic conductivity of mixed conductor and the temperature under the different measuring voltages are presented.
6Li3VO4混合导体电子电导率与温度关系的实验结果，提出了导电Li＋离子对电子电导的作用机制，并由此解释了实验结果。
补充资料：delaVallée-Poussin导数
delaVallée-Poussin导数
de la VaDce - Poussin derivative
山hV团倪一P加石幽1.导数【de hVa肠纯一R版动l心由.dve;Ba服ny伙ella甲山即口.1，广义对称导数(罗nerali-欲互s脚四netric deriVa石ve) 由Ch.J.de h vall能一Poussin(【11)定义的一种导数.设r为偶数，并设存在占>O使对满足}t}<占的一切t，有 合{f(x。+‘，+f(x。一艺，，- 一刀。+冬:，口2+…+弄。r且+:(:):r，(*) 2一r名r!一rr‘、一，一，其中声:，…，戊为常数，下(t)~o(当t~O)且下(o)=0.数尽”f(r)(x0)称为函数f在点x。的:阶dehvallee-Poussin导数或;阶对称导数. 奇阶r的dehV么11阮一Po璐in导数可类似定义，只要把方程(*)代之为 冬仃(、+‘)一了(、一:)}- 2 一。。1十冬‘，。、十…十共:r坟十:(:):: 3!一厂Jr!一r”‘、一z一’ deh从山阮一Poussin导数左，帆)与R~nn二阶导数相同，后者常称为 Sch认么反导数.若关r)闻存在，则几一2)闻(r)2)也存在，但f(r一l)(x0)未必存在.若存在有限的通常双边导数f(r)帆)，则人r)帆)二f‘r)(x0).例如，对函数f(x)二sgnx，f(川(0)=0，k=1，2，‘二，但左*+1)(。)(k=0，1，…不存在.若de h vall由一Po.in导数人。)(x0)存在，则由f的Fo~级数逐项微分r次所得级数S‘r)(f)在x。对于“>r是(C，的可和的，其和为寿)帆)([2〕)(见C威的求和法(。滋ms~·tion methods)).
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