TANDBERG TT7116 IP传输流处理器

“铁丝+电视”就可以实现数字信息化！”这似乎是天方夜谭,但今天却变成了事实。北京基和在线技术开发有限公司投入巨资、历经八年的艰苦研发,终于开发出新一代互联网络接入技术TDD/EDSL(Time DivisionDuplexing/Emerging Digital Subscriber Line),从而真正突破了“最后一公里”的瓶颈。此技术于近期通过了国家信息标准委员会的鉴定,成为新一代接入网国家传输技术标准。     

让奥迪更震撼 奥迪A6音响改装纪实

多年的口碑加上官车的光环，奥迪A6在国人的心目中，已经成了高贵身份的象征，对于普通消费者来说，奥迪A62．8原车的音响配置已经很不错了——后置六碟CD，前、后声场6英寸套装扬声器，后排还配备了蓝宝（Blaupunkt）DVD系统和两只头枕显示屏。但是，车主却对这套音响系统感到不是很满意．什么样的音响器材能与之匹配？什么样的音响效果更适合眼前驾驭这部车的主人呢？看着眼前这位潇洒又不失幽默的A6 2．8车主，我不禁发出这样的疑问。[编者按]     

Analysis of thickness-shear and thickness-twist modes of AT-cut quartz acoustic wave resonator and filter

The thickness-shear(TS) and thickness-twist(TT) vibrations of partially electroded AT-cut quartz plates for acoustic wave resonator and filter applications are theoretically studied. The plates have structural variations in one of the two in-plane directions of the plates only. The scalar differential equations derived by Tiersten and Smythe for electroded and unelectroded AT-cut quartz plates are used, resulting in free vibration resonant frequencies and mode shapes for both fundamental and overtone families of modes. The trapped modes with vibrations, mainly confined in the electroded areas, are found to exist in both the resonator and the filter structures. The numerical results for the trapped modes are presented for different aspect ratios of electrodes and material properties, providing a reference to the design and optimization of quartz acoustic wave resonators and filters.     

奥迪在PlayStation 3上测试e=tron电动概念跑车

奥迪这款以PS3平台为基础的驾驶游戏最晚会在今年12月份推出,奥迪也是第一个开发虚拟体验空间的汽车厂商。赛车爱好者不久就能在PS3上体验到奥迪的全新驾驶概念,而在PS3社区（Play Station Home）还有3D互动游戏服务,他们可以在3D的虚拟跑道中驾驶每个车轮都配备一个电动机的e-tron。     

休闲商务车典范 新奥迪A6L 2.8FSI quattro豪华型试驾

2009款奥迪A6L高档商务车上市时间已经不短了,每当在滚滚的车流中看到那嚣张的大嘴和头灯下面泪眼效果的LED日间行车灯,尤其是那犹如人眼造型一样炯炯有神的环形LED尾灯,便不由得产生一种眼前一亮,触电的感觉     

Study of information hiding algorithm based on GHM and color transfer theory

Taking the feature that the energy of the image would gather and spread on four components （LL2, LH2, HL2 and HH2） in the sub-image after first-order GHM multi-wavelet-transform. And by using the color control ability of 1αβ color space in color transfer theory （CTT）, an information hiding algorithm based on GHM-CTT is proposed. In this way, the robust parameters are embedded in the LL2, the hidden information is set in LH2 and HL2 with RAID4, and fragile sign is set in HH2. The consistence between the embedded data bits＇ order and the embedded code of the sub-image is improved by using the chaotic mapping and the genetic algorithm. Experimental results indicate that the GHM-CTT can increase the imperceptibility by 15.72% averagely and robustness by 18.89% at least.     

10kV变电站单相接地故障有关问题探讨

在本案,笔者以10/0.4kV变电站为例,首先分析变电站高压侧单相接地故障对TN、TT系统的危害,然后再提出减轻这一危害的建议.     

低压配电系统中几个容易混淆的概念

对低压配电系统的几个重要的概念解释、区别进行介绍,同时对使用时的注意事项进行了阐述。     

高智能越野专家 奥迪Q5 3．2 S—LINE

奥迪为满足高档中型SUV市场进一步细分的产品需求，特别为那些追求纯粹驾驶乐趣的消费者提供了这款动感型产品叫53．2S—LINE，该车在全新的8速tiptronic手动／自动一体式变速器的基础上，装备了7速Stronic双离合变速器，为驾驶者提供了更为畅快的换挡感受。     

Ku波段圆极化自跟踪馈源设计

介绍了用于Ｋｕ波段ＴＴ＆Ｃ地球站圆极化自跟踪馈源的设计方法，即对圆波导中跟踪的ＴＥ２１模“强耦合”以通信的ＴＥ１１模及其它杂模“弱耦合”并对耦合出的两种正交差信号巧妙地实现了圆极化，测试结果表明该馈源在１０．７～１４．９ＧＨｚ频率范围内具有优良的和差辐射及匹配特性，和差隔离度优于４０ｄＢ（不含滤波器）保证了宽频带，高性能的频谱复用。