试听Wharfedale(乐富豪)Emerald(绿宝石)系列EM-97音箱

绿宝石EM-97是乐富豪公司98年推出的重点产品,箱体上下顶板、侧板、面板均由优质原木制成,配上原木皮外饰更添气派。驱动单元:25mm高音,丝织球顶液磁,型号为Wharfedale Model-0302A;170mm塑料矿物质聚合物中低音单元,型号为Wharfedale Model-1749A。音箱系英国本土制造。 在试听过程中,使用了以下曲目: 一、《中国名曲发烧天碟》(YT-A149)(日本录音大师高浪初郎真空管制作) “三五七”、“二泉映月”、“金色狂舞” 二、《EIN STRAUSSFEST》(CD-80098 TELARC版) “Explosions Polka”(爆炸波尔卡)、     

经导管闭合房间隔缺损的疗效观察

目的评价经导管置入Amplatzer封堵器治疗继发孔型心房间隔缺损(ASD)的疗效。方法 11例患者中男3例,女8例,年龄4～46岁(平均25岁)。术前经多普勒超声心动图检查房间隔缺损直径为12～28mm,平均(18.5±6.1)mm。在透视及经超声心动图引导下经导管置入Amplatzer封堵器闭合ASD。结果 11例ASD直径的球囊测量值为(25.2±8.3)mm(15～36mm),选择的封堵器直径为(25.4±7.7)mm(15～36mm)。11例封堵器置入均获得成功,术中无并发症。2例术后即刻超声检     

低价亦圆靓声梦

本文介绍的组合(音箱 功放)价位在4500元左右。笔者在20m~2左右的厅中,用各种类型的音乐软件试听,音效良好,特介绍给各位同好。     

X-Mode Frequency Modulated Density Profile Reflectometer on EAST Tokamak

An extraordinary-mode(X-mode) frequency-modulated continuous-wave(FMCW) profile reflectometer has been built on EAST.In the reflectometer,continuous waves with frequency sweeping from 12.5 GHz to 18 GHz were generated through a Hyperabrupt Tuned-varactor Oscillator(HTO) source and a four times active multiplier was used to increase the frequency to V-band(50 GHz to 72 GHz).The polarization of horn lens antenna is perpendicular to the magnetic field line at the edge plasmas.According to the V-band frequency range and polarization,the system cover density range from 0.5 × 1019m 3to 3.0 × 1019m 3(when toroidal magnetic field is 1.8 T),with time resolution of 12.5 ~ 50 μs.The density profile could be calculated by assuming the edge profile through an empirical equation.The maximum spatial error deduced by the method is about 4 cm.This reflectometer has been successfully applied in 2010 autumn EAST campaign,the temporal evolution of density profiles was acquired during the low confinement mode to high confinement mode transition.The density pedestal of EAST Tokamak was observed and the top value and gradient of the density pedestal were estimated.     

一套平价而优秀的HI—FI组合

近年来世界上许多音箱名厂在研制中低价位的书架箱方面可谓使出了浑身的解数,成就也堪称卓著,为音响音乐爱好者带来了福音。英国TANNOY(天朗)也不甘寂寞,它们以水星系列为突破口,研制了多款荣获世界殊荣的小型书架箱,文中的主角Revolution(革命)RI就是其中的一款。该箱在1998年9月被《What Hi-Fi?》