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找出一个3x3数组的“鞍点”-find a 3x3 array of "saddle"

Matlab program for graphical presentation

说明：  James_et_al-2013 an_introduction_to_statistical_learning_with_applications_in_R(James_et_al-2013-an_introduction_to_statistical_learning_with_applications_in_R)

802.15 dsss 物理协议层方针代码-802.15 dsss physical protocol layer code policy

VB透明窗体制作例子，透明度在代码中可自定义，可完全透明，也可不透明，也就是变成常规窗体，采用了API函数，无第三方函数，在VB6.0环境下可直接对源代码编译运行。窗口透明效果请参见源码测试截图。

pb开发的计算器，已经经过调试，可以满足基本的计算器要求，有需要的可以下载( pb development of the calculator, after debugging, to meet the basic requirements of the calculator, there is a need to download)

分频器，用于时钟信号的分频及倍频，供专业人事学习研究使用-Prescaler for the clock signal frequency and octave, for study and research the use of professional personnel

说明：  HP VEi8 latest BIOS with flash tool under dos

笔者首先提出了煤岩变形破裂过程电磁辐射与应力耦合的概念,然后在实验研究、理论分析和数值模拟的基础上从力电耦合的角度研究了煤岩冲击矿压预测的电磁辐射法(ＥＭＥ)。研究结果表明:ＦＬＡＣ3Ｄ方法能对矿山巷道掘进过程煤岩内部应力场进行有效的数值模拟 电磁辐射信号主要来源于应力集中区,在场点监测到的电磁辐射信号主要是应力集中区煤岩变形破裂过程产生的 ＥＭＥ信号呈现出与煤岩内部应力变化相同的规律 利用力电耦合方法研究煤岩冲击矿压电磁辐射预测法是可行的。笔者最后还对未来煤岩冲击矿压电磁辐射预测法的研究进行了展望。-first author of coal and rock deformation and fracture process of electromagnetic radiation coupled with the concept of stress, then the experimental research, theoretical analysis and numerical simulations on the basis of Congli coupling angle of coal and rock rockburst forecast of electromagnetic radiation (EME). The results showed : FLAC3D method to mine tunneling process of coal and rock internal stress effective numerical simulation of electromagnetic radiation signal comes mainly from the stress concentration areas, the monitoring point to the presence of electromagnetic radiation signal is mainly concentrated stress coal rock deformation and fracture process of EME signal showing the internal rock and coal Stress changes in the s

电力系统潮流计算体现在数学就上是多元非线性方程组的求解问题，求解的方法有很多种。牛顿—拉夫逊法是数学上解非线性方程式的有效方法，收敛性好、迭代次数少。将牛顿—拉夫逊法用于潮流计算是以导纳矩阵为基础的，由于利用了导纳矩阵的对称性、稀疏性及节点编号顺序优化等技巧，使牛顿—拉夫逊法解题规模和计算速度进一步提高，此算法至今仍是潮流计算中广泛采用的优秀算法。(Power flow calculation in power system is a problem of solving multivariate non-linear equations in mathematics. There are many methods to solve it. Newton-Raphson method is an effective method for solving nonlinear equations in mathematics. It has good convergence and fewer iterations. The application of Newton-Raphson method to power flow calculation is based on admittance matrix. Because of the use of symmetry, sparsity and optimization of node number sequence of admittance matrix, the scale and speed of Newton-Raphson method are further improved. So far, this algorithm is still an excellent one widely used in power flow calculation.)