For example , the dtd contains certain semantic features that determine which elements can or must occur inside other elements . the docbook tags are applied so that they have a certain " common sense " semantic content , at least to english speakers 除此之外， xml schema提供了进一步限制元素或属性的可允许内容的机制甚至可以设置值的有效范围或定义内容必须遵守的正则表达式！
To minimize the amount of stack frame space required for a method , the same words of the stack frame may be used for different local variables at different points in the bytecode , as long as the active ranges for the variables don t overlap 在字节码中，为了使方法所需要的堆栈空间最小化，不同位置的不同本地变量可能会使用堆栈结构中的同一个字，只要变量的有效范围不重叠。
If you invoke the list members option using the insertion point in global scope or by typing : : in any valid scope , intellisense populates the members list with global symbols , including system api functions and c classes 如果通过在全局范围内使用插入点或者在任何有效范围内键入: :来调用“列出成员”选项，则intellisense将用全局符号（包括系统api函数和c + +类）填充“成员”列表。
Connectors with assessed quality , for use in d . c . , low - frequency analogue and in digital high speed data applications - rectangular connectors - detail specification for a range of shielded connectors with trapezoidal shaped shells and non - removable rectangular contacts on a 1 , 27 x 2 , 54 mm centre - line 直流低频模拟及高速数字数据系统用已经过质量评定的连接器.矩形连接器.带梯形壳的屏蔽连接器的有效范围和在1 . 27x1 . 54mm中心线的非移动矩形接触详细规范
Research on retrieval of gps water vapor and method of rainfall forecast are keen field which draws all attention from wide world . the dissertation is accomplished on the basis of sino - italy collaborative project - ' the integral system of flood risk programming , monitoring and real time forecasting " and the primary achievements and conclusion reached include : ( 1 ) a reasonable design has been made for gps water vapor monitoring network according to the theory of gps satellite signal propagation and vertical distribution of water vapor and local synoptic characteristic of binjiang basin , the effective area where water vapor can be detected by gps station has been determined under different cut - off angles . the conclusion has been reached that 3 ~ 4 gps receivers are enough for water vapor monitoring in binjiang basin Gps水汽反演和降雨预报研究是当前气象遥感应用的一个前沿探索领域，本论文依托于中意科技合作项目“洪水风险规划、监测和实时预报的集成系统” ，主要成果体现在以下方面： ( 1 )提出了一个合理的gps水汽监测网设计方案根据gps卫星信号传播原理和水汽垂直分布规律以及流域天气的地方性特征，确定了不同高度截角下一个gps站所能测定大气水汽含量的有效范围，得出了滨江流域只需要3 4个gps接收机就足以反映流域水汽变化的结论。
The wsf method and ml method can be used in direction finding of coherent sources . we find that tam has the widest direction finding range while the available direction finding ranges of the dsam , sam _ isp , sam _ aisp , sam _ gsp and sam _ agsp are in a certain area centered at the look direction . the sam _ isp , sam _ aisp , sam _ gsp and sam _ agsp can change the effective direction finding ranges by adjusting their inner parameters and furthermore they can improve the sidelobe suppression effect compared with the dsam method 得到tam的测向范围最宽,基于后五种简化阵列流形的测向方法其测向有效范围均是集中在波束指向附近的一定范围内,其中sam _ isp 、 sam _ aisp 、 sam _ gsp和sam _ agsp对应的测向范围可通过调整内部的参数进行相应的调整,相应地较dsam也可改善对旁瓣源的抑制效果。
( 1 ) a generalized detection algorithm was proposed for all the 3 combining methods . ( 2 ) according to the simulations and the analysis , the error performance of the easiest equal gain combing ( egc ) was found to be as good as maximal ratio combining ( mrc ) and better than selective combining . ( 3 ) the effect of fading parameter , correlation coefficient and carrier frequency offset on the system performance was also investigated 主要成果如下：针对不同的接收分集技术提出了一个简单、通用的检测算法；采用实验仿真手段，对不同合并方法的性能进行了比较，发现计算复杂度最小的等增益合并方法在性能上接近最大比合并方法并优于选择性合并方法；对系统的衰落参数、相关系数和载波频偏等因素的作用规律进行了研究，根据误码门限获得了使系统正常工作所需的各参数的有效范围，为实际系统的设计提供了有用信息。
