https://msdn.microsoft.com/en-us/library/9fkccyh4.aspx The virtual keyword is used to modify a method, property, indexer, or event declaration and allow for it to be overridden in a derived class. For example, this method can be overridden by any cla…

https://msdn.microsoft.com/en-us/library/sf985hc5.aspx The abstract modifier indicates that the thing being modified has a missing or incomplete implementation. The abstract modifier can be used with classes, methods, properties, indexers, and events…

This page describes the construction of an RFID reader using only an Arduino (Nano 3.0 was tested, but others may work), a hand-wound wire coil, and some assorted low cost common components. Credits The hardware and software designs for this project…

RFID读写器的工作原理 RFID的数据采集以读写器为主导,RFID读写器是一种通过无线通信,实现对标签识别和内存数据的读出和写入操作的装置. 读写器又称为阅读器或读头(Reader).查询器(Interrogator).读出装置(Reading Device). 扫描器(Scanner).通信器(Communicator).编程/编码器(Programmer)等等. 读写器工作原理 RFID读写器的基本原理是利用射频信号与空间耦合传输特性,使电子标签与阅读器的耦合元件在射频耦合通道内进行能量传…

COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION In principle, then, every virtual memory reference can cause two physical mem-ory accesses: one to fetch the appropriate page table entry, and one to fetch the desired dat…

This 125 kHz RFID reader http://www.serasidis.gr/circuits/RFID_reader/125kHz_RFID_reader.htm http://www.serasidis.gr/circuits/RFID_reader/images/125kHz_RFID_reader_schem.GIF I will try to explain with simple words how the RFID works. The ATtiny13 use…

致谢 本文是基于对<Inside the c++ object model>的阅读和gdb的使用而完成的.在此感谢Lippman对cfront中对象模型的解析,这些解析帮助读者拨开迷雾.此外,Linux下无比强大的gdb工具更是驱散"黑暗"的"明灯".  :) No-Inheritance class Base { public: ; static int b; ; void showBase1(); static int showBase2(); };…

(4)top详解 (每周一个linux命令系列) linux命令 top详解 引言:今天的命令是用来看cpu信息的top top 我们先看man top top - display Linux processes 翻译:显示linux进程信息 具体的描述如下: The top program provides a dynamic real-time view of a running sys‐ tem. It can display system summary information as w…

C++ Core Guidelines September 9, 2015 Editors: Bjarne Stroustrup Herb Sutter This document is a very early draft. It is inkorrekt, incompleat, and pµøoorly formatted. Had it been an open source (code) project, this would have been release 0.6. Copy…

/********************************************************************************* * Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object referenc…