张家港电视台总控系统简介

电视台的总控系统是将相互独立的各频道的播出系统、节目制作系统以及各直播单元有机地结合在一起，通过对信号的统一管理和集中处理，以达到资源共享、整体调控的目的，降低了电视节目播出的成本，提高了播出的灵活性和安全性。     

V槽结型场效应晶体管在模拟集成电路中的应用

结型场效应晶体管(简称J-FET)具有低噪声、高输入阻抗以及高截止频率、高输出阻抗的特点。把它做进模拟集成电路里,用于输入级、动态负载和恒流源,可以提高电路的性能。但是,在模拟集成电路里,外延层厚度、扩散深度被双极型晶体管要求所固定。因此,采用一般平面J-FET存在以下二方面的限制: 第一,对J-FET参数的控制,在工艺上比较困难。第二,通常只能把P沟J-FET做进双极型集成电路里,要制造内含N沟低阈值电压的J-FET则是十分困难的。为此,采用了这种新的J-FET结构。它与一般平面的J-FET结构主要不同处是具有V形槽沟道区。顶控制栅沿着V形槽边壁。由于沟道区非     

Nodular Carbon Nanotubes and Their Field Emission Characteristics

A new configuration of carbon namotubes(CNTs) has been discovered in our laboratory and their surfaces are fully covered with nano-sized node-like structures.The node structures have almost the same size of 40-50nm.We refer to this material as the nodular carbon nanotube (NCNT).Field emission scanning electron microscopy shows that after a hydrogen plasma process in our homemade plasma equipment,the common carbon nanotubes were changed into NCNTs.The experimental result demonstrates that this material has good field emission characteristics,low threshold field,stable and suitable emitting surrent,especdially for the emission site density up to the order of 10^6cm^-2.