forward direction

• The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment . the numerical results show that a more focused beam radiated in the broadside direction is achieved . the gain of the pbg patch antenna in the forward direction is improved by about 6 db . the radiation directivity is improved significantly and reaches 11 . 5 db , which is 0 . 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4 . 1 db less than the difference achieved by thevenot et al . ,
  用fdtd方法并结合pml吸收边界条件，我们对加了这种新的覆层结构并且基底钻孔的复合结构电磁(光子)晶体贴片天线的性能进行了研究，结果证明加了这种新的电磁晶体覆层结构以后，天线的波束收拢很多，并且向前辐射的增益大大提高，与普通天线相比，天线的e面和h面方向图上向前辐射的增益均提高了约6db ，另外，该复合结构天线的方向性系数达到了11 . 5浙江大学博士学位论文db ，与该物理尺寸天线的方向性系数的理论极限值( 11 . 9db )相差0 . 4db ，该差值比thevenot等人设计的电磁晶体覆层天线的相应差值减少了约4 . 1db ，比qiu等人设计的电磁晶体天线的相应差值减少了约1
• The optical - limit glauber theory has been of great success in describing the stable nucleus scattering at high energies . as it is extended to the nucleus scattering at low and intermediate energies , the modification of the coulomb field to the effective impact parameter and the diffuseness of the nucleon - nucleon ( n - n ) scattering in the forward direction has to be taken into account
  其中光学极限近似的glauber模型能很好地描述高能小角度的稳定核散射，进一步推广应用于研究中低能稳定核散射时，需要考虑库仑相互作用对有效碰撞参数的修正和核子?核子两体散射在朝前方向的弥散。
• 3 . in point of the bionics , in order to make the actual trajectory of the robot more smooth and more reasonable , the robot uses the result of the global path planning as the march forward direction and detects the realtime surroundings in the march . this method overcomes the blindness of the local path planning
  广西人学md ：论义自主式移动机器人的路径规划3 、为了使机器人在实际行进中的路线更加平滑、更加合理，从仿生学的角度研究，利用全局路径规划结果为行进指引方向，在实际行进中，实时检测周围环境避障，克服局部路径规划的盲目性。