在oracle中utl_file包提供了一些操作文本文件的函数和过程，学习了一下他的基本操作 1.创建directory，并给用户授权 代码如下: –创建directory create or replace directory TESTFILE as ‘/home/oracle/zxx/test’; –给用户授权 grant read, write on directory TESTFILE to zxx; 详细介绍 http://download.oracle.com/docs/cd/B
In this Letter, we have demonstrated significant electric field induced (EFI) optical rectification (OR) effects existing in the surface layers of germanium (Ge) and measured the distributions of EFI OR signals along the normal directions of surface
Pockel’s effect and optical rectification induced by the built-in electric field in the space charge region of a silicon surface layer are demonstrated in a ｛001｝-cut high-resistance silicon crystal. The half-wave voltage is about 203 V, deduced by P
