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Apr 29, 2009
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Dolan Precursa

The Dolan Precursa from Velodrome.org.uk is an excellent entry-level frame for established track riders or beginners.
Although billed as entry level, it has professional credentials as Dolan employs the same materials and construction used on the Track Champion
Dolan is a well-known brand, and rightly so when Olympic, World and Commonwealth Champion Sir Chris Hoy is riding founder Terry Dolan's bikes.


Dolan DF3

At the 2009 World Track Cycling Championships in Poland, Lithuanian Simona Krupeckaite made history on her Dolan DF3 after she claimed the Gold Medal and Rainbow Jersey in the Women's 500m Time Trial with a new World Record time of 33.296s, a massive 0.3s faster than Anna Meares' 33.588s World Record from the 2007 Worlds in Mallorca.
We took a closer look at the Dolan DF3 to see what makes this possibly the fastest bike in the world.

Apr 13, 2009
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卫星电视安装是近几年迅速发展起来的,利用地球同步卫星将数字编码压缩的电视信号传输到用户端的一种广播电视形式。主要有两种方式。一种是将数字电视信号传送到有线电视北京卫星电视安装前端,再由有线电视台转换成模拟电视传送到用户家中。这种形式已经在世界各国普及应用多年。另一种方式是将数字电视信号直接传送到用户家中即:Direct to Home(DTH)方式。美国Direct TV公司是第一个应用这一技术的卫星电视营运公司。与第一种北京卫星电视安装方式相比,DTH方式卫星发射功率大,可用较小的天线接收,普通家庭即可使用。同时,可以直接提供对用户授权和加密管理,北京卫星电视安装开展数字电视,按次付费电视(PPV),高清晰度电视等类型的先进电视服务,不受中间环节限制。此外DTH方式还可以开展许多卫星电视安装服务之外的其他数字信息服务,如INTERNET高速下载,互动电视等。   DTH在国际上存在两大标准,欧洲的标准DVB-S和美国标准DigiCipher。但DVB标准逐渐在全球广泛应用,后起的美国DTH公司Dish Network也采用了DVB标准。