把课本搬上荧幕

钱经理所在的公司出资修建了一所希望小学,本来是好事,钱经理却觉得有点烦。小学刚刚建好,正需要添置各种设备。老总偏偏把投影机的采购任务交给了钱经理,理由是钱经理懂技术,懂设备,交给他放心。接到任务,钱经理觉得很郁闷,首先自己没怎么接触过投影机,再说这教育行业用的投影机跟商用的还有区别,自己可不是内行啊。于是,钱经理把i博士和欧主管叫来,聊起了投影机。     

向“协同”要效能

协同软件不仅仅是应用于企业信息化或电子政务,从中小企业信息化一直到个人市场也都会使用到协同的技术和产品,本期i博士将带你了解协同软件。     

12倍才是王道——4款12倍光学变焦数码相机横向评测

柯尼卡美能达DiMAGE Z5；索尼Cyber-shot DSC-H1；松下Lumix DMC-FZ5；佳能PowerShot S2 IS。     

美丽新“视”界

刚从上海飞回北京的钱经理,刚回到家中就躺在床上呼呼睡去了,旅途的劳顿让他有些疲惫。一觉醒来,已是第二天清晨。打开电脑,刚登录MSN,欧主管就来打招呼:"老兄,最近怎么样?在忙些什么?""还能忙什么啊,公司业务扩大了,给各个分支机构部署任务,忙都忙死了!还有好多地方没去呢!"钱经理一脸无奈地说。     

A note on circle packing

The problem of packing circles into a domain of prescribed topology is considered. The circles need not have equal radii. The Collins-Stephenson algorithm computes such a circle packing. This algorithm is parallelized in two different ways and its performance is reported for a triangular, planar domain test case. The implementation uses the highly parallel graphics processing unit (GPU) on commodity hardware. The speedups so achieved are discussed based on a number of experiments.     

Effect of zeranol on bull muscle fibre composition

Two trials are reported in which bulls were implanted with zeranol and slaughtered at 18 months. There was no significant change in carcass weight due to zeranol in either trial. Samples of the longissimus dorsi (LD) and splenius (Sp) were cross-cryosectioned, stained for myofibrillar ATPase and examined by conventional light microscopy. The stain resolved three fibre types: I, slow contracting with an oxidative metabolism, IIA, fast-oxidative-glycolytic and IIB, fast-glycolytic. In the LD from treated bulls, the occurrence of IIB fibres was increased, apparently at the expense of IIA fibres, as the occurrence of I fibres was unchanged. These occurrence changes parallelled previously reported effects of castration. Changes in Sp were less dramatic. In one trial IIB fibres were absent from all Sp muscles, but, in the other, some of the Sp muscles from treated animals contained these fibres whereas they were absent from the Sp of the control group. If the changes in fibre type occurrence due to zeranol extend to skeletal muscles other than LD and Sp, there is likely to be a subtle change in the musculature's metabolism. Fibre areas were largely unaffected by zeranol. In this respect zeranol did not mimic castration.     

Beam profile measurement of a solar-pumped iodine laser

Beam profile measurements have been made as a function of time within the laser pulse and C2F5I pressure. Measurements indicate that the profile is determined directly by the optical excitation volume, produced by the solar simulator, and that media distortion plays a minor role compared to the build up of quenching species during the lasing pulse.     

从微观经济学看企业计算市场发展

基于2006—2013年的历史市场数据,本文从微观经济学的角度分析了企业计算资源市场的供需关系。工业界可以依据本文所提供的数据设计更好的定价策略,从而同时达到市场扩张和增加营收的目的。