查询词典 approximate partial derivative

A series of diazonium salts of 4-(N-methyl-N-phenylamino)-3-amino-1,8-naphthalic anhydride 5a, its naphthalimide derivative 5b, and 5e were designed and synthesized,and it was the first time to discover that aromatic radical-induced intramolecular aromatic 1, 5-hydrogen transfer was also involved in the nitrogen-contianed system during Pschorr cyclization.

实验设计合成了4--3-氨基-1，8-萘酐的重氮盐5a、其衍生物N-丁基-4--3-氨基-1，8-萘酰亚胺的重氮盐5b和N--4--3-氨基-1，8-萘酰亚胺的重氮盐5c，并首次发现了通过普朔尔环化反应以氮甲基化的氮为桥原子的体系存在着芳香自由基诱导的芳香1，5-氢转移。

Two kinds of di aniline derivative s connected with oxamethylene bridge or azamethylene bridge were synthesizied by condensation of o nitrophenol and ethylene dibromide (1,4 dibromobutane)or 4 chloro 3,5 dinitrobenzotyifluoride and ethylene diamine(1,6 hexandiamine)and consequent reduction.

由邻硝基苯酚和二溴乙烷以及由4－氯－3， 5－二硝基三氟甲苯和乙二胺为原料通过桥接、还原合成两类由氧亚甲基或氮亚甲基桥联的双苯胺衍生物。

In Chapter 2, starting from the basic fractional ordinary differential equations,weapply a high order approximation of fractional derivative advanced by Lubich to frac-tional differential equation, construct a high numerical difference scheme to solve thefractional differential equation, present error analysis of the algorithms theoretically,and prove the consistency ,convergency and stability.

接下来的第二章中，首先从基本的分数阶常微分方程出发，对Lubich提出的一个关于分数阶导数的高阶近似，将其应用于分数阶微分方程，构造高阶数值差分格式来进行分数阶微分方程的数值求解，并在理论上给出这一算法的误差分析，证明了它的相容性，收敛性和稳定性。

Through the comparison with other learning methods, the conclusion is drawn that the Powell method in which the derivative is replaced by the difference quotient is an eff...

通过与其他学习算法的比较，得出结论：其中用差商近似代替导数的Powel法是一种高效、快速的学习方法，其学习速率比带动量项的学习率自适应的BP算法高一个量级，而比DavidenFletcherPowel、BroydenFletcherGoldfarlShanno等变尺度方法以及其他非线性最小二乘法的稳定性要好得多。

Thirdly, in order to improve the learning efficiency and stability of feedforward neural network, a fast learning algorithm for neural networks based on CGM-OC approach is presented. Compared with other learning methods such as BP method, Broyden Flecher Goldfarl Shanno method and Powell method in which the derivative is replaced by the difference quotient etc, simulation results show that the proposed method is an efficient and fast one.

第三，为了提高前馈神经网络权值的学习效率及稳定性，提出一种基于正交校正共轭梯度优化方法的神经网络学习算法，通过与其它学习算法（如：BP算法、变尺度法、用差商近似代替导数的Powell法等）的比较，经仿真试验表明，本算法是一种高效、快速的学习算法。

In this paper, the idea of that derivative is replaced with difference quotient is involved in calculating each item of Jacobi matrix.

船舶自由浮态计算实质也是求解一个隐式非线性方程组，故同样可用这一方法求解。

The weight values in NLSM were adjusted automatically according to target data, which allowed the measured data with different dimensions or ranges to be treated at the same level, and thus the accuracy and stability of algorithm were improved accordingly. Derivative was replaced by the difference quotient in NLSM which further improved the algorithm speed.

非线性最小二乘法的权值根据目标数据自动调整，使得不同量纲和不同数值范围的观测数据可以在同一水平上进行，提高了计算的精度和稳定性；另一方面用差商近似代替导数加快了算法的收敛速度。

Two mathematical derivations of them have been introduced by using the properties of differentiable function and the derivation algorithm of multiple function in present paper, and several mistakes in some derivative methods have also been pointed out.

介绍了应用可微函数的性质及多元复合函数的求导性质推导热力学中著名的麦克斯韦关系式的方法，指出了有关文献中推导过程的不

The interactions for 3, 3-bisoxetane/tetrahydrofuran copolymer with hexanitrohexaazaisowurtzitane (CL-20), 3, 4-dinitrofurazanfuroxan, 1, 3, 3-trinitroazetidine and ammonium nitrate were studied by using pressure differential thermal analyzer and thermogravimetry-derivative thermogravimetry.

用高压差示扫描量热法和热重－微商热重法，研究了PBT与CL-20、DNTF、TNAZ、ADN之间的相互作用。

By definition, we can see that the marginal analysis of differential calculus is essentially a derivative of the application.

由定义可知，边际分析法实质上是微分学中一阶导数的应用。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48