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Dual-voltage regulator meets USB-power needs
This Design Idea stems from the limited availability of IC voltage regulators that can meet key USB-power specs, coupled with the need for turn-on seq...
分类:其他好文   时间:2014-11-28 14:04:34    阅读次数:162
Tiny microcontroller hosts dual dc/dc-boost converters
Batteries are the typical power sources for portable-system applications, and it is not unusual these days to find microcontroller-based portable syst...
分类:其他好文   时间:2014-11-28 11:35:12    阅读次数:342
Bluetooth low energy介绍
1. 介绍 Bluetooth low energy,也称BLE(低功耗蓝牙),在4.0规范中提出 BLE分为两种设备 - 单模(single-mode): Logo为「Bluetooth®Smart」 - 双模(dual-mode): Logo为「Bluetooth®Smart Ready」 ti...
分类:其他好文   时间:2014-11-27 21:49:18    阅读次数:241
码字定式之SQL(7)
With 子句从 oracle 9i 开始支持--不用connect by,只用dual表,构造出1到128with a as (select 1 from dual union all select 1 from dual)select rownum from a, a, a, a, a, a, ...
分类:数据库   时间:2014-11-27 14:13:49    阅读次数:187
ORACLE时间函数(SYSDATE)深入理解
加法 select sysdate,add_months(sysdate,12) from dual; --加1年 select sysdate,add_months(sysdate,1) from dual; --加1月 select sysdate,to_char(sysdate+7,'yyyy...
分类:数据库   时间:2014-11-27 12:18:26    阅读次数:242
my work
My undergraduate major is Management, but my master major is Competer, from to arts student to science student. So I have dual character. I am not onl...
分类:其他好文   时间:2014-11-27 12:17:50    阅读次数:96
码字定式之SQL(3)
oracle 中有个很重要的同义词 dual。往dual中插入数据是作死的节奏,记住这点就可以。insert into dual values('20');你再执行 select count(*) from dual; 和 select count(dummy) from dual;呵呵,看不懂了吧...
分类:数据库   时间:2014-11-27 12:12:31    阅读次数:231
Oracle Database 11g Express Edition修改字符集
为什么要修改字符集?使用用户system,通过sqlplus程序连接到Oracle数据库,输入以下命令,查看字符集:SQL> select userenv('language') from dual;USERENV('LANGUAGE')-------------------------------...
分类:数据库   时间:2014-11-26 14:14:56    阅读次数:384
USACO 1.2 Dual Palindromes (回文,进制转换)
废话不哆嗦,贴代码: /* ID:twd30651 PROG:dualpal LANG:C++ */ #include #include #include #include using namespace std; char s[100]; int N,S; void gs(int num,int BASE) { int index=0; while(num/BASE...
分类:其他好文   时间:2014-11-25 23:42:41    阅读次数:260
Oracle序列归0的2种方法
1.用存储过程让myseq序列归0declaren number(10);tsql varchar2(100);beginselect MYSEQ.nextval into n from dual;n:=-(n-1);tsql:='alter sequence MYSEQ increment by'...
分类:数据库   时间:2014-11-25 23:28:04    阅读次数:239
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