中国国际广播电视信息网络展览会（CCBN）15年成绩卓著

第十五届中国国际广播电视信息网络展览会（CCBN2007）将于2007年3月30日一4月1日在北京举办。历经14年的风雨．CCBN取得了令人瞩目的成就．目前已经发展成为亚太地区规模最大的广播影视技术设备展览会，世界排名首位的数字电视和宽带网络行业盛会。CCBN2007预计有来自世界上30多个国家和地区的1000余家参展企业和机构．展览面积60000m^2。《国家“十一五”时期文化发展规划纲要》明确了CCBN是国家重点支持的8个重要文化产业展会之一，进一步确定了其在中国广电产业发展中所具有的深厚基础与深远影响力．是推动中国广电行业乃至世界广电科技进步的重要平台。     

NURBS曲面RCS的物理光学法混合计算

基于近似驻相法和直接积分法,在利用物理光学法(PO)计算NURBS曲面的雷达散射截面(RCS)的问题中提出一种混合积分法.这种方法既保持积分精度,又提高了计算速度.此外,归纳了七种不适合用一般驻相法处理的剖分面元.同时验证了计算中采用NURBS面元剖分对于提高目标RCS计算精度的作用.     

做精现有产业 加快做强步伐 泰格林纸乘上发展快车

“小发展大困难，大发展小困难，不发展难上加难”。在发展这一课题上，泰格林纸集团董事长王祥把“大发展”定为走好下一步、走出湖南、走向全国的基调。     

新一代天气雷达结构共振研究

CINRAD的天线座系统(天线座、铁架和大楼)在安装后,由于地基和装配的原因造成机械谐振频率低,运行过程中容易产生共振,影响雷达的正常使用。为了克服共振问题,这里提出了一种电路抑制机械谐振的方法,即在谐振频率点附近设置凹口滤波器,对其谐振峰值进行抑制,从而有效的抑制了系统的共振。     

功率半导体技术能够帮助中国发展更高效和环保的能源系统

中国正在寻求利用半导体技术来改善家用电器和电力设备中的低效率用电的状况，以便节约能源。以中国半导体技术的应用为例，本主题报告说明了硅技术、硅加工工艺以及系统解决方案如何为家用电器、功率设备、PC机和其他的消费类设备领域的设计人员和生产商铺平道路，使得在电力变换和电能利用方面获得更高的效率。     

缺相保护在全固态电视发射机中的应用

本文指出了现有部分电视发射机机型缺相保护电路设计不完善,并就此给出个人的解决方法。     

有杆抽油系统效率分析及抽汲参数优化设计

针对有杆泵往复抽汲采油方式使用广泛,但系统效率较低的实际情况,对有杆泵抽油系统进行了能量消耗分析,以机械采油系统效率最高为目标,确立了机械采油系统优化设计的目标函数和约束条件,给出了有杆泵抽油时机、杆、泵及抽汲参数的优化设计方法。该方法可应用于机抽油井的参数优化和新投产井的优化设计。胜利采油厂的应用实例表明,参数优化后油井的系统效率提高了11.6%,降低了综合成本,提高了经济效益。     

Microstructure and wear properties of tungsten carbide reinforced steel matrix composites

WC（27%） reinforced steel matrix composites were produced by using an electroslag melting casting technique. The microstructure of the material was characterized using scanning electron microscopy（SEM）, optical microscopy and X-ray diffraction （XRD）. Energy dispersive spectroscopy（EDS） and transmission electron microscopy were performed to investigate the interracial composition between WC particle and steel matrix. The results reveal that the WC particles are partially melted into the steel substrate. At the same time, a reaction layer was detected along with the periphery of WC particle, which significantly enhances the bonding strength of the interface. A slipping wear （high stress abrasion） test was utilized to understand the wear behavior of this material. Abrasive experiment displays a better wear resistance than unreinforced steel matrix when coarse WC particles are dispersed into it. The coarse particles provide greater wear-resistance than the fine particles and operatively takes on the most applied loads. Additionally, the large particles have not been peeled during the wear process for a long time, which indicates the effect of interfacial reaction on wear behavior at the ambient temperature. A double carbide （Fe, W）3C is detected in the interface zone between particles and matrices using transmission electron microscopy.     

Prefabrication of SiC whiskers through induction of carbon fiber

A new way to prepare SiC whiskers through the induction of carbon fiber was suggested. With the processing steps of opening furnace firstly and then shutting it, rice hall, as the only raw material, was carbonified to get excess quantity of Si in rice hull. After a certain catalyzer was added, SiC whiskers were prepared by means of the induction of carbon fiber. The component and morphology of the whisker were analyzed by XRD, SEM and TEM. The results reveal that the diameters of the whiskers range in 0.5-2 μm and their lengths in 100-500 μm. The whiskers are straight β-SiC crystals with smooth surface. The whisker is homogeneous and its productivity is 100%. Two kinds of formation mechanisms, both VLS mechanism and vapor formation mechanism, are involved during the growth of the whiskers. But the vapor formation mechanism relatively plays a key role.     

阻燃抗熔融粘胶纤维——Anti-fcell（下）

安纺阻燃纤维（Anti—fcell）是具有阻燃抗熔融作用的功能纤维，解决了涤纶的易燃、熔融滴落以及粘胶纤维易燃的问题，填补了国内空白。文章简述了国内外阻燃粘胶纤维技术发展情况，介绍了Anti—fcell的生产工艺、物理机械性能，并重点分析讨论了Anti—fcell的阻燃性能。Anti—fcell能大大提高化学纤维的应用性能以及安全性能，提高纤维与纺织品的附加值，可广泛应用于民用、工业以及军事等领域。