A comparative cerebral blood flow study in a baboon model with acetazolamide provocation: 99mTc-HMPAO vs 123I(IMP)

Pharmacological interactions are important when nuclear medical procedures are applied to patients under drug therapy, or drug provocation. This study compares in baboon models (regional) cerebral blood flow [(r)CBF] results from 99mTc-HMPAO and 123I-iodoamphetamine [123I(IMP)] each with and without acetazolamide, the latter a suggested drug for testing cerebrovascular reserve. Expected differences in cerebral uptake were observed between the two radio-tracers without acetazolamide. The increase in tracer uptake resulting from acetazolamide is significantly enhanced for 123I(IMP), which could have diagnostic implications.     

Development of high‐definition aqueous polyvinylpyrrolidone photoresists for cathode ray tubes

Aqueous photoresists that are capable of higher resolutions than are currently employed by the cathode ray tube (CRT) industry were developed by combining photoactivators, which activate at shorter UV wavelengths with polyvinylpyrrolidone (PVP). Two photoactivators were synthesized: 4,4′‐diazido‐2,2′‐biphenyl disodium disulfonate (DABP), which has a maximum absorbance at 264 nm, and 4,4′‐diazido‐2,2′‐biphenylethane disodium disulfonate (DABPE), which has a maximum absorbance at 258 nm. The PVP/DABP and PVP/DABPE photoresists successfully imaged a pattern with resolution as small as 4.4 μm with photoactivator concentrations greater than 20% of the PVP concentration. Addition of silane and emulgen greatly improved the performance of the photoresists with more uniform coatings of thicknesses of up to 1.4 μm. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1637–1644, 2006     

2012年苹果仍将是平板电脑销量冠军

虽然基于Android系统的平板电脑增长快速,但目前看来苹果仍将保持绝对领先的态势。随着英特尔超极本的推出以及Windows8面市,PC型平板或将成为平板市场上一股新的力量。据IHS iSuppli公司全球平板电脑市场追踪报告显示,2012年苹果公司将以其iPad系列产品轻松保持在全球平板电脑市场的绝对领先地位,尽管一众Android产品和基于PC的平板产品也在努力进入这个迅速增长的市场。今年包括媒体平板和PC型平板在内的平板电脑销量将增加到1.266亿台,比2011年的     

IC CAD中的图形运算算法与实现

熊猫系统是一个基于全定制ASIC,同时能完成半定制ASIC设计的完整的ICCAD系统。GOA(Geometric Operations and Analysis tool)是其中的完成图形算术、逻辑、拓扑运算的工具及软件库。本文将介绍它的作用及其与其它工具的关系,并详细介绍了其算法及我们在α测试和β测试中针对速度和精度要求所做的改进工作。     

Strategies to improve electrode positioning and safety in cochlear implants

An injection-molded internal supporting rib has been produced to control the flexibility of silicone rubber encapsulated electrodes designed to electrically stimulate the auditory nerve in human subjects with severe to profound hearing loss. The rib molding dies, and molds for silicone rubber encapsulation of the electrode, were designed and machined using AutoCad and MasterCam software packages in a PC environment. After molding, the prototype plastic ribs were iteratively modified based on observations of the performance of the rib/silicone composite insert in a clear plastic model of the human scala tympani cavity. The rib-based electrodes were reliably inserted farther into these models, required less insertion force and were positioned closer to the target auditory neural elements than currently available cochlear implant electrodes. With further design improvements the injection-molded rib may also function to accurately support metal stimulating contacts and wire leads during assembly to significantly increase the manufacturing efficiency of these devices. This method to reliably control the mechanical properties of miniature implantable devices with multiple electrical leads may be valuable in other areas of biomedical device design.     

哈佛研制出具有宏观电势的纳米光伏电池

Charles Lieber博士领导哈佛大学的一个研究小组开发了一种约300nm厚的共轴硅纳米线,可以制作用来驱动小型电路和纳米机器的光伏（PV）电池。     

扬声器系统的自动均衡、分频和对齐

为了得到更好的音质,扬声器设计除了采用新材料和新工艺外,设计人员还利用DSP实现精确的信号处理与控制。而先进的软件可以帮助设计师提高产品开发效率,获得最佳扬声器设计方案。     

2011电视半导体市场增长势头减弱

由于价格压力沉重和电视销售低迷,去年电视主板上使用的半导体销售额萎缩,并迫使一些知名厂商永远退出该产业。不过随着新功能的推出,半导体企业仍存在增长机会。