查询词典 first-order derivative

Becausethe ginger flavine and its the synonym have many kinds of pharmacologyactiveness, at present, conducted the research take this kind ofcompound as the forerunner which the structure optimized to cause inthe world scope chemist and the medicine scientist's widespreadattention, take the ginger flavine as the raw material, first had thefunction production corresponding sodium salt in the organic solventby NaOH or NaOEt and a-H, then and 卤代烃carried on the substitution reaction, the response condition which theresearch optimized, and grew this derivative monocrystal with thesolution law.

由于姜黄素及其类似物所具有的多种药理活性，目前，以该类化合物为先导进行结构优化的研究引起了世界范围内的化学家和药物学家的广泛关注，以姜黄素为原料，先在有机溶剂中以NaOH或NaOEt与a-H发生作用生成相应钠盐，再和卤代烃进行取代反应，研究优化的反应条件，并用溶液法生长该衍生物单晶体。

In this paper, viscoelastic fractional derivative model is used for the first time in dynamic analysis of SRM, and various verification tests are carried out.

本文首次将粘弹性分数阶导数模型用于发动机的动力学分析，并进行了多种试验验证。

Heart rate, systolic pressure, the first derivative of left ventricular pressure, coronary flow, and PR and QRS intervals were measured in isolated constant-pressure perfused, nonrecirculating Langendorff heart preparations.

心率、收缩压、+dP/dtmax 、冠脉血流及 PR 、 QRS 间期被测量于离体恒压灌流、非再循环豚鼠心脏标本。

The spectra, which were pretreated with the method of first derivative combined standard normal variate, were analyzed by principal component analysis.

将经一阶导数结合标准归一化处理后的光谱进行PCA降维，以前20个主成份（含原始光谱86.09%的特征信息）为输入变量，建立杂交稻种纯度鉴定的BP-ANN模型。

By using the condition that the tangential components of electromagnetic field and its first derivative are continuous across the interface, we can get the transfer matrix for normal photonic crystal.

我们考虑的是光波以任何角度θ入射的情况。同样采用传输矩阵，结合TM序列的性质得到传输矩阵及透射率的表达式。

First derivative combined with standard normal variate was used to pretreat spectra, and calibration model for ginsenosides had been built by partial least squares regression method.

标准正则变换结合一阶导数对光谱进行预处理后，采用偏最小二乘回归算法建立在线测量总皂苷浓度的近红外光谱校正模型。

The study showed that spectra information can be extracted thoroughly by the pretreatment method of first derivative combined with standard normal variate, with the SEC of 0.002 5, SEP of 0.006 6, and determination coefficients of 0.988 4 and 0.922 7 respectively.

分析表明采用一阶导数结合标准归一化处理能最有效地提取光谱信息，此时PLS模型校正集决定系数与检验集决定系数分别为0.988 4与0.922 7，校正标准误差与预测标准误差分别为0.002 5与

Three different numerical iterative algorithms are developed and the accuracy and stabilities of them are compared. Tension and compression instabilities are studied and effects of Conservative Smoothing Approach and artificial viscosity on stabilities are discussed. Based on Taylor series expansion, Modified SPH method is proposed. The discrete forms of the function and its first derivative estimations of the kernel function are deduced in both one and two dimensional space.

讨论了三种不同的数值迭代算法对计算精度和稳定性的影响；分析了不稳定性产生的根源，包括拉伸不稳定和压缩不稳定，探讨了保守光滑算法和人为粘性对稳定性的影响；在Taylor展开的基础上提出了一种修正的SPH方法，并推导一维和二维情形下函数的核估计和函数的一阶导数核估计的离散形式，结果表明，二维情形下MSPH方法可以很好的改善边界粒子的计算精度。

Padé approximation is an effective rational approximation.Using the first derivative of Gaussian function as basic wavelet,Pad conversion is used to obtain its rational fraction approximation.

采用高斯函数一阶导数作为基本小波，用Padé变换获得其有理分式逼近，利用开关电流技术实现小波滤波器可获得小波变换所需的基本小波及其膨胀小波。

At first, this thesis gives right calaculation results of derivative of Daubechies scaling function, the determine fashion of continuity is rendered.

本论文首先推导了Daubechies尺度函数导数或高阶导数的正确计算结果，给出了它的连续性的判定方式。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。