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  • VB精选版

    Visual Basic(简称VB)是Microsoft公司开发的一种通用的基于对象的程序设计语言,为结构化的、模块化的、面向对象的、包含协助开发环境的事件驱动为机制的可视化程序设计语言。是一种可用于微软自家产品开发的语言。 [1]  “Visual” 指的是开发图形用户界面 (GUI) 的方法——不需编写大量代码去描述界面元素的外观和位置,而只要把预先建立的对象add到屏幕上的一点即可。 “Basic”指的是 BASIC (Beginners All-Purpose Symbolic Instruction Code) 语言,是一种在计算技术发展历史上应用得最为广泛的语言。

    标签: VB精选

    上传时间: 2019-03-06

    上传用户:Yingshangling

  • java实现大整数运算

    在包 hugeinteger 中创建功能类 HugeInteger,该类用来存放和操作一个不超过 40 位的大整数。 (1) 定义一个构造函数,用来对大整数进行初始化。参数为一个字符串。 (2) 定义 input 成员函数,实现大整数的重新赋值。参数为一个字符串,无返回 值。 (3) 定义 output 成员函数,将大整数输出到屏幕上。无参数无返回值。 (4) 定义 add 成员函数,实现两个大整数的加法。参数为一个 HugeInteger 对 象,无返回值,例如: HugeInteger A = new HugeInteger("12345"); HugeInteger B = new HugeInteger("1234"); A.add(B); 此时,A 为 13579,B 为 1234。 (5) 定义 sub 成员函数,实现两个大整数的减法。参数和返回值同 add 函数。 (6) 定义若干大整数关系运算的成员函数,包括 isEqualTo(等于,=)、 isNotEqualTo(不等于,≠)、isGreaterThan(大于,>)、isLessThan(小 于,<)、isGreaterThanOrEqualTo(大于等于,≥)和 isLessThanOrEqualTo (小于等于,≤)。这些函数的参数为一个 HugeInteger 对象,返回值为一个 布尔类型,表示关系运算的结果,例如: HugeInteger A = new HugeInteger("12345"); HugeInteger B = new HugeInteger("1234"); 那么此时 A.isGreaterThan(B)的结果应当为 True,表示 12345>1234。

    标签: java 整数 运算

    上传时间: 2019-06-01

    上传用户:idealist

  • keilc51v6.12

      keil C51 v6.12 完全解密版的安装说明      安装方法是先将V6.12安装程序复制到某个目录下,如复制到D:\keilC51  然后执行D:\keilC51\setup\setup.exe 安装程序,选择安装Eval Version版进  行安装。  注册码:K199U-20071-12A9U      当出现Please insert the add-on disk的提示画面,可按next按钮(不用  插入软盘)。      安装好之后就可以使用,没有代码大小的限制,这是完全版,比 Eval版增  加浮点库等内容。

    标签: keilc 51 12 v6

    上传时间: 2020-03-20

    上传用户:mimeme

  • Broadband Access Networks Technologies

    At present, there is a strong worldwide push toward bringing fiber closer to indi- vidual homes and businesses. Fiber-to-the-Home/Business (FTTH/B) or close to it networks are poised to become the next major success story for optical fiber com- munications. In fact, FTTH connections are currently experiencing double-digit or even higher growth rates, e.g., in the United States the annual growth rate was 112% between September 2006 and September 2007, and their presence can add value of U.S. $4,000–15,000 to the selling price of a home.

    标签: Technologies Broadband Networks Access

    上传时间: 2020-05-26

    上传用户:shancjb

  • Indoor Radio Planning

    This book is intended for RF planners, to serve as a practical tool in their daily work designing indoor radio distribution systems. Based on feedback from readers of the first edition it was clear to me that I needed to add more material and in depth description of the basics of indoor systems based on using repeaters; this has grown into a new Section 4.7. There was also a strong demand to add more detail and dedicate a full chapter to radio planning in tunnels, for both rail and road tunnels; and redundancy principles in the design focus for solving the challenge of handover zones. An entire Chapter 11 is now dedicated to tunnel radio planning.

    标签: Planning Indoor Radio

    上传时间: 2020-05-27

    上传用户:shancjb

  • Short-range+Wireless+Communication

    Developers, manufacturers and marketers of products incorporating short- range radio systems are experts in their fields—security, telemetry, medical care, to name a few. Often they add a wireless interface just to eliminate wires on an existing wired product. They may adapt a wireless subsystem, which is easy to integrate electrically into their system, only to find that the range is far short of what they expected, there are frequent false alarms, or it doesn’t work at all. It is for these adapters of wireless subsystems that this book is primarily intended.

    标签: Communication Short-range Wireless

    上传时间: 2020-06-01

    上传用户:shancjb

  • CMOS MEMS_ A KEY TECHNOLOGY

    The mature CMOS fabrication processes are available in many IC foundries. It is cost-effective to leverage the existing CMOS fabrication technologies to implement MEMS devices. On the other hand, the MEMS devices could also add values to the IC industry as the Moore’s law reaching its limit. The CMOS MEMS could play a key role to bridge the gap between the CMOS and MEMS technologies. The CMOS MEMS also offers the advantage of monolithic integration of ICs and micro mechanical components. 

    标签: TECHNOLOGY CMOS MEMS KEY

    上传时间: 2020-06-06

    上传用户:shancjb

  • deljosdfsd

    【实例简介】 一、Delphi程序启动Word 采用CreateOleObjects的方法来启动Word,调用VBA代码,具体实现过程为: 首先使用GetActiveOleObject('Word.Application')判断当前内存中是否存在Word程序,如果存在,则直接连接,如果没有Word程序,则使用CreateOleObject('Word.Application')启动Word   二、Delphi程序新建Word文稿 格式:WordDocuments.Add(Template,NewTemplate,DocumentType,Visible) Template: 使用模板的名称, NewTemplate: 新建文档的类型,True表示为模板,False表示为文档 DocumentType: 文档类型,默认为空白文档 Visible: 打捞的窗口是否可见  

    标签: deljosdfsd

    上传时间: 2021-01-12

    上传用户:

  • Analog and Digital Control System Design

    This texts contemporary approach focuses on the concepts of linear control systems, rather than computational mechanics. Straightforward coverage includes an integrated treatment of both classical and modern control system methods. The text emphasizes design with discussions of problem formulation, design criteria, physical constraints, several design methods, and implementation of compensators.Discussions of topics not found in other texts--such as pole placement, model matching and robust tracking--add to the texts cutting-edge presentation. Students will appreciate the applications and discussions of practical aspects, including the leading problem in developing block diagrams, noise, disturbances, and plant perturbations. State feedback and state estimators are designed using state variable equations and transfer functions, offering a comparison of the two approaches. The incorporation of MATLAB throughout the text helps students to avoid time-consuming computation and concentrate on control system design and analysis

    标签: 控制系统

    上传时间: 2021-12-15

    上传用户:

  • 一博科技PCB设计指导书VER1.0. 66页

    一博科技PCB设计指导书VER1.0. 66页常见信号介绍  1.1 数字信号  1.1.1 CPU 常称处理器,系统通过数据总线、地址总线、控制总线实现处理器、控制芯片、存 储器之间的数据交换。  地址总线:ADD* (如:ADDR1)  数据总线:D* (如:SDDATA0)  控制总线:读写信号(如:WE_N),片选信号(如:SDCS0_N),地址行列选择信 号(如:SDRAS_N),时钟信号(如:CLK),时钟使能信号(如:SDCKE)等。  与CPU对应的存储器是SDRAM,以及速率较高的DDR存储器:  SDRAM:是目前主推的PC100和PC133规范所广泛使用的内存类型,它的带宽为64位, 支持3.3V电压的LVTTL,目前产品的最高速度可达5ns。它与CPU使用相同的时钟频 率进行数据交换,它的工作频率是与CPU的外频同步的,不存在延迟或等待时间。 SDRAM与时钟完全同步。  DDR:速率比SDRAM高的内存器,可达到800M,它在时钟触发沿的上、下沿都能进行 数据传输,所以即使在133MHz的总线频率下的带宽也能达到2.128GB/s。它的地址 与其它控制界面与SDRAM相同,支持2.5V/1.8V的SSTL2标准. 阻抗控制在50Ω±10 %. 利用时钟的边缘进行数据传送的,速率是SDRAM的两倍. 其时钟是采用差分方 式。  1.1.2 PCI  PCI总线:PCI总线是一种高速的、32/64位的多地址/数据线,用于控制器件、外围 接口、处理器/存储系统之间进行互联。PCI 的信号定义包括两部份(如下图):必 须的(左半部份)与可选的(右半部份)。其中“# ”代表低电平有效。

    标签: pcb设计

    上传时间: 2022-02-06

    上传用户:得之我幸78