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An efficient procedure for increasing explant and the influence of antibiotic pretreatment on establishment of aseptic culture was investigated in Dieffenbachia.

本研究旨在探讨有效率的培植体供给来源与抗生素处理对黛粉叶无菌培养建立的影响。

There are many methods for the cloning of novel genes, but one of the most efficient methods is based on the diff...

新基因克隆的方法很多，利用细胞间基因表达的差异是克隆功能性新基因最有效的手段之一。

This method is highly precise in generalized orthogonal polynomial convolutional differentiator and also highly efficient in finite difference short operator method.

该方法同时具有广义正交多项式褶积微分算子的高精度和有限差分短算子算法的高速度。

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。

This research tests that if it is efficient to use learning-theory in teaching and learning of table tennis. The research adopts the way that makes comparison between a tested boy group and a collated boy group, as well as a comparison between a tested girl group and a collated girl group. It compares the skill level between tested group and collated group, as well as the difference between interest in table tennis class and learning methods, with which it analyses the effects on students given by the using of learning-theory.

本研究通过教学实验来检测学习理论应用到乒乓球教学中是否有效，采用一个男生实验组与一个男生对照组进行比较和一个女生实验组与一个女生对照组进行比较，比较实验组与对照组在学生的乒乓球技术水平、学生上乒乓球课的兴趣和学生的学习方法上的差异，从而分析学习理论应用在乒乓球教学中对学生的影响。

Perturbation analysis is an efficient method to study DEDS, whitch requires the differentiability of the performance function.

摘要扰动分析是研究离散事件动态系统的有效方法，性能函数的可微性是应用该方法的前提条件之一。

Among used machine learning methods, the gradient descent method is widely used to train various classifiers, such as Back-propagation neural network and linear text classifier. However, the gradient descent method is easily trapped into a local minimum and slowly converges. Thus, this study presents a gradient forecasting search method based on prediction methods to enhance the performance of the gradient descent method in order to develop a more efficient and precise machine learning method for Web mining.However, a prediction method with few sample data items and precise forecasting ability is a key issue to the gradient forecasting search method. Applying statistic-based prediction methods to implement GFSM is unsuitable because they require a large number of data items to model a prediction model. In the contrast with statistic-based prediction methods, GM(1,1) grey prediction model does not need a large number of data items to build a prediction model, and it has low computational load. However, the original GM(1,1) grey prediction model uses a mathematical hypothesis and approximation to transform a continuous differential equation into a discrete difference equation in order to model a forecasting model.

其中梯度法是一个最常被使用来实现机器学习的方法之一，然而梯度法具有学习速度慢以及容易陷入局部最佳解的缺点，因此，本研究提出一个梯度预测搜寻法则(gradient forecasting search method， GFSM)来改善传统梯度法的缺点，用来提升一些以梯度学习法则为基础的分类器在资讯探勘上的效率与正确性；而一个所需资料量少、计算复杂度低且精确的预测模型是梯度预测搜寻法能否有效进行最佳解搜寻之关键因素，传统统计为基础之预测方法的缺点是需要较大量的数据进行预测，因此计算复杂度高，灰色预测模型具有建模资料少且计算复杂度低等优点，然而灰色预测理论以连续之微分方程式为基础，并且透过一些数学上的假设与近似，将连续之微分方程式转换成离散之差分方程式来对离散型资料进行建模及预测，这样的作法不尽合理，且缺乏数学理论上的完备性，因为在转换过程中已经造成建模上的误差，且建模过程仅考虑相邻的两个资料点关系，无法正确反应数列未来的变化趋势。

It is well known that the method of separation of variables is an efficient way to solve linear partial differential equation.

众所周知，分离变量的方法是研究线性偏微分方程的最实用、最有效的工具之一。

This process of solving differential games is more conformity with practice,and provides an efficient method for adding human experience and combining the qualitative analysis with quantitative analysis of differential game.

将微分对策的双向优化问题转化成基于神经网络理论的目标机动性辨识和单向优化控制问题，将微分对策的定性与定量结合起来，为有效加入人的经验提供了一种技术途径。

In this paper , using the DDA method, after calculating optical characteristics of the difformity aerosol particles, the author gets the relationships of extinction factor and absorption factor of aerosol particles with the changing incident wavelength, combining the Muller scattering matrix, the angular distribution of scattering intensity and polarizability of aerosol particles is given, which provides an efficient approach for the research of atmospheric radiation and transmission.

本文基于DDA方法，对不同形状气溶胶粒子的光学特性进行计算，得到气溶胶粒子的消光因子、吸收因子随波长变化的数值结果。结合Muller散射矩阵，给出了气溶胶粒子散射强度和极化度的角分布，为研究大气辐射传输提供了有效的方法。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了