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VB_PPT
VB.NET 程序设计语言课程内容
第一章：概述
第二章：使用窗体和控件
第三章：变量和数组
第四章：过程
第五章：判断结构与循环结构
第六章：验证用户输入
第七章：面向对象编程
第十一章 使用 ADO.NET
数据库概念
ADO.NET 概述
使用数据
数据库概念
数据库术语
数据库编程的工作方式
SQL
连接环境
非连接环境
课堂练习 区别适用于连接或非连接方案的场景
数据库术语
数据库编程的工作方式
SQL
连接环境
在连接环境中，应用程序会持续连接到数据源上
优点
连接环境更易于维护
并发控制更容易
与非连接环境相比，数据更容易刷新
缺点
必须维持稳定的网络连接
有限的可扩展性
非连接环境
非连接环境是指可以在本地对数据进行单独修改，然后再把修改更新到数据库
优点
与数据源保持连接的时间短，而且并发访问的连接数少，从而能为更多用户提供服务
非连接环境大大增加了连接的可用性，从而改善了应用程序的可扩展性和性能
缺点
数据不总是最新的
可能发生更改冲突，这是个必须解决的问题 ()
- 2008-05-12 11:06:03下载
- 积分：1
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SPSScaozuo
数理统计软件SPSS使用说明，该软件实现功能包括了基本上常用的概率统计方法。(SPSS statistical software for use, the software features include a basically realize the probability of statistical methods commonly used.)
- 2008-05-03 16:39:00下载
- 积分：1
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CHEMKIN_III
CHEMKIN III FORTRAN user manual
- 2012-10-20 15:42:57下载
- 积分：1
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divide-and-conquer-method
最终还是上传了我的课件，课件是北京大学的教学PPT，请大家分享学习(divide-and-conquer method)
- 2014-11-14 16:53:18下载
- 积分：1
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Linear-active-disturbance-rejection-based-load-fr
A new grid load frequency control approach is proposed for the doubly fed induction generator based
wind power plants. The load frequency control issue in a power system is undergoing fundamental
changes due to the rapidly growing amount of wind energy conversation system, and concentrating on
maintaining generation-load balance and disturbance rejection. The prominent feature of the linear
active disturbance rejection control approach is that the total disturbance can be estimated and then
eliminated in real time. And thus, it is a feasible solution to deal with the load frequency control issue.
In this paper, the application of the linear active disturbance rejection control approach in the load
frequency control issue for a complex power system with wind energy conversation system based on
doubly fed induction generator is investigated.
- 2017-04-30 14:22:36下载
- 积分：1
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TeraCopy 3.26_Free
second first methal as der
- 2018-02-10 06:32:04下载
- 积分：1
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机器学习实战
一本以python为学习语言的机器学习书，内容详细，很适合python初学者学习(A machine learning book based on Python for learning language is detailed and suitable for Python beginners to learn.)
- 2018-04-19 19:01:45下载
- 积分：1
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Hp-Computing-Parallel-Computing
高性能并行计算
迟学斌 中国科学院计算机网络信息中心(High-performance parallel computing Chi Xuebin, Chinese Academy of Sciences Computer Network Information Center)
- 2013-03-13 11:07:20下载
- 积分：1
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DynamicPowerQualityTestingTechnology
本文首先介绍了有源电力滤波器的基本结构和工作原理，并对一些常规的谐波电流检测方法的优缺点进行了比较。其次，针对传统的谐波电流检测方法的缺陷，提出将神经网络与基于噪声抵消原理的自适应谐波检测相结合，利用径向基函数运算量小、收敛快、无局部极小值等优点，构造了一种基于径向基函数神经网络的谐波电流检测方法，仿真结果表明该检测方法具有很好的动态响应及畸变电流检测精度。最后，设计了一套实验系统，对本文所采用的系统方案进行了实验验证。仿真表明，本文所采用的有源电力滤波器检测系统方案切实可行，能够较好地实现动态检测谐波和无功功率的目的。 (This paper, firstly, introduces the basic structure and principle of APF, and then makes comparison among some conventional harmonics detections methods. Secondly, contraposes the limitation of the traditional harmonic current detecting method based on neural network, presents the method that combines the neural network and auto adaptive harmonic current detecting method based on the principle of noise each other eliminating.As the characteristics that are small calculative quantity, fast converge, without local minimal point of Redial Basis Function (RBF), this dissertation forms a new harmonic current detecting method based on RBF. The simulation results show that the method has many advantages, such as good dynamic response, high accuracy. At last, A system is designed to verify the proposed APF scheme .The results of simulation show that the proposed APF scheme is practical and can detect harmonics and reactive power effectively. )
- 2009-05-03 10:26:45下载
- 积分：1
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C_tanhaoqiang
谭浩强的C语言书籍，对于C语言的学习来说，是一本很好的入门书籍(a good book for C)
- 2016-11-25 09:13:24下载
- 积分：1
