查询词典 approximate partial derivative

The definition and stability criterion of resonant operating points in a CPT system have been described. A Poincarémapping model has been built up and its Jacobian matrix has been derived with the implicit function derivative rule and chain rule. Then the stability of the fixed points can be determined according to the eigenvalues of the the Jacobian matrix. It has been used to study an example push-pull CPT system with three resonant operating points.

文中给出了CPT系统中谐振点的定义及判断条件，建立了系统的庞加莱映射模型，并根据隐函数及复合函数求导法则，推导出了系统庞加莱映射周期不动点的雅可比矩阵，根据雅可比矩阵的特征值分布情况，即可判断各不动点的自治振荡稳定性。

In presented method, the correlated variables are transformed into uncorrelated variables equivalently, and the performance functions in the correlated variables space are transformed into those in the equivalent uncorrelated variables space, in which the reliability sensitivity of the system failure probability with respect to the distribution parameters of the uncorrelated variables can be solved by the moment method for the uncorrelated variables. Finally the equivalent relationship between the correlated variables and the uncorrelated variables, the chain rule for derivative are employed to obtain the reliability sensitivity of the system failure probability with respect to the means of the correlated variables.

在所提的方法中，首先将相关变量空间等效转化为不相关变量空间，并将系统多个失效模式的功能函数转化为不相关变量空间的功能函数，进而利用矩方法得到多模式系统失效概率对不相关变量空间基本分布参数的灵敏度，最后利用相关变量空间与不相关变量空间的等价关系及复合函数求导法则，求得多模式系统失效概率对相关变量空间中变量均值的灵敏度。

The characteristic of fractional order differential equation iscontaining the non-integer order derivative. It can effectively describe the memory andtransmissibility of many kinds of material, and plays an increasingly important role inengineering, physics, finance, hydrology and other fields.

分数阶微分方程的特点是含有非整数阶导数，能非常有效的描述各种各样的物质的记忆和遗传性质，在工程，物理，金融，水文等领域发挥越来越重要的作用。

In point of the physical characters,it is better to differentiate the time derivative in the characteristic direction than intime direction.

1.4中针对流体的流动以对流为主的物理特性，采用特征线法去对时间导数项离散，使截断因子比通常的时间方向离散小得多，更好地反映了问题的物理特性。

At the same time committed to the development of derivative products, charcoal and production.

与此同时致力于木炭衍生产品的开发和生产。

Objective To study the effect of derivative of chitin on fracture healing and further investigate its therapetic mechanism.

目的 探讨甲壳质衍生物在骨折愈合中的作用，并进一步探究甲壳质衍生物对骨折愈合的作用机制。

New research shows that chlorophyllin -- a water-soluble derivative of chlorophyll, the green pigment found in most plants -- may be 10 times more potent at killing colon cancer cells than hydroxyurea, a chemotherapeutic drug commonly used in cancer treatment.

新的研究表明叶绿酸，这种多数植物里都含有的叶绿素的水溶性衍生物，可能比常用的化疗药物羟基脲在导致结肠癌细胞死亡的作用上要强10倍。

Objective: To test the conceptive and anti-HIV-1 activity of a new cholate derivative, deoxycholytyosine by replacing the side chain of sodium deoxycholate with tyrosine.

目的：检测自制的避孕型杀微生物剂的候选化合物脱氧胆酰酪氨酸(deoxycholyltyosine， DCT)体外杀精和抗HIV活性。

The MIC of induced fluconazole less susceptible derivative to Citral was also measured.

柠檬醛不易产生耐药性，且对氟康唑敏感性下降的诱导株仍敏感。

The rubber compound comprises a rubber which has at least two functional groups which can be cross-linked by hydrosilylation, a cross-linking agent consisting of hydrosiloxane or a hydrosiloxane derivative or a mixture of several hydrosiloxanes or derivatives, which comprise at least two SiH-groups per molecule in the centre, a hydrosilylation catalyst system, at least one filling material and a coagent which can be cross-linked by hydrosilylation.

为此该橡胶混配物包括：具有至少两个可通过氢硅烷化交联的官能团的橡胶；作为交联剂的氢硅氧烷或氢硅氧烷衍生物或者由数种氢硅氧烷或其衍生物组成的混合物，所述氢硅氧烷或其衍生物平均每个分子具有至少两个SiH基团；氢硅烷化催化剂体系；至少一种填料；和可通过氢硅烷化交联的助剂。

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