直播下被放大的世纪婚礼

2011年4月29日的英国伦敦,泰晤士河流光溢彩、游人如织,白金汉宫前的林荫大道两旁人潮汹涌。不少人在一周前就来到这里安营扎寨,通宵露宿等候,为的就是一睹英国威廉王子与平民凯特的世纪婚礼。     

英国皇室婚礼直播采用草谷设备

在英国威廉王子和凯特王妃的大婚典礼上,NEP Visions共派出4辆转播车在维斯敏斯特教堂、白金汉宫广场等不同地点进行信号制作。其中,转播车HD4负责在威斯敏斯特教堂举行的婚     

流光溢彩的智慧伦敦

伦敦位于英格兰东南部的平原上,有着2000年的悠久历史,是众所周知、星光闪耀的国际化大都市。去伦敦旅游,一定少不了到伦敦眼、大英博物馆、圣保罗大教堂、巨石阵、伦敦塔桥、白金汉宫这些人们耳熟能详的地方去逛逛。英国历史斑驳的痕迹,厚重的文明从这些古迹遗产中可窥见一斑。     

当定制与奢侈邂逅

有人说：只要你足够有钱，雪茄这东西简直妙不可言：既可以拿出来表明身份地位，也可以用来怡情养性、享受生活中独处的乐趣。作为世界上最昂贵的烟草制品——雪茄总是与名流、权贵联系在一起，无论是都柏林帝国大厦里的酒会，还是伦敦白金汉宫的签约现场。雪茄的身影随处可见。     

Benchmark solutions for sound propagation in an ideal wedge

Sound propagation in a wedge-shaped waveguide with perfectly reflecting boundaries is one of the few range-dependent problems with an analytical solution, and hence provides an ideal benchmark for a full two-way solution to the wave equation. An analytical solution for the sound propagation in an ideal wedge with a pressure-release bottom was presented by Buckingham and Tolstoy [Buckingham and Tolstoy 1990 J. Acoust. Soc. Am. 87 1511]. The ideal wedge problem with a rigid bottom is also of great importance in underwater acoustics. We present an analytical solution to the ideal wedge problem with a perfectly reflecting bottom, either rigid or pressure-release, which may be used to provide a means for investigating the sound field in depth-varying channels, and to establish the accuracy of numerical propagation models. Closed-form expressions for coupling matrices are also provided for the ideal waveguides characterized by a homogeneous water column bounded by perfectly reflecting boundaries. A comparison between the analytical solution and the numerical solution recently proposed by Luo et al. [Luo W Y, Yang C M and Zhang R H 2012 Chin. Phys. Lett. 29 014302] is also presented, through which the accuracy of this numerical model is illustrated.