简约专注丰富均衡--Arcam DivA AVP700环绕声前级放大器与DivA P1000七声道后级放大器测评

来自英国的Arcam(雅骏)——一个以生产高性价比影音产品而闻名欧美的品牌,它一直专注于为广大Hi-Fi及AV爱好者生产出而高品质的影音器材．同时,它也是《What Hi Fi?》BEST BUY榜和欧洲影音器材销量排行榜的常客。久闻其名,今天笔者有幸接触到这一款来源于极品FMJ系列,装备了先进影音数码及模拟技术的Arcam AV分体式功放——DiVA AVP700环绕声前级放大器及DiVA P1000七声道后级放大器,怀着激动的心情,我们开始了这段不同凡响的影音之旅。导读：为了让读者能在短时间内体会到这款分体式功放的特性,笔者从它的外观、硬件设计、功能及音色四大部分进行了剖析,通过仔细的观摩、对比和试听,最终将它的特性浓缩为以下这四个词语：简约、专注、丰富、均衡。     

Linear spatio-temporal characterization of a UV microscope objective for nonlinear imaging and spectroscopy by using two-dimensional spectral interferometry

Two-dimensional Fourier transform spectral interferometry is used to characterize the spatio-temporal aberrations of a UV microscope objective. The spatial and temporal profiles of a 420 nm, 38 fs pulse at the focus of a 0.32 NA UV objective are then deduced using a wave propagation code incorporating the measured aberrations.     

"高清"不再是梦想--FEEL X3620多媒体中心试用

目前国内已经开始流行高清电视、液晶显示器、等离子显示器、大画面投影机等显示设备,但最大的问题是没有高清晰度的节目源,而日系可以输出1080i格式信号的DVD机都要人民币万元左右,并且还不是纯数字高清信号的节目源。现在FEEL X3620多媒体中心的出现就很好地解决了这个尴尬的问题,为用户提供了一个廉价的高清晰节目源的可行方案。     

Using GaAsP photodiodes to characterize ultrashort pulses under high numerical aperture focusing in microscopy

We demonstrate for the first time that the two-photon response of GaAsP photodiodes can be used to conveniently characterize the spatial and temporal profiles of ultrashort pulses at the focus of a high numerical aperture system.     

Real-time two-photon confocal microscopy using a femtosecond, amplified Ti:sapphire system

The bilateral imaging approach known from confocal applications operating in the line mode was used to realize real-time two-photon imaging. It is shown that the sectioning inherent to two-photon imaging could be improved by the introduction of a confocal line aperture in the imaging path. Using a high-power, low-repetition-rate amplified Ti:sapphire system, various biological objects were visualized including live boar sperm.