An ERP study for the degrees of the difficulty in visual search

The present study mainly probed the relationships between ERP components and the degrees of difficulty in visual search. Three experimental and one controlled conditions were randomly selected. Results showed that the P1, N1, and P2 amplitudes and latencies had no significant differences among the three experimental and one controlled conditions, and the ERP waveforms of low perceptual load of visual search were different from that of high perceptual load. These results might indicate that the latencies and amplitudes of initial P1, N1 and P2 in high and low perceptual load conditions were almost the same. The ERP waveforms of parallel search were very different from that of serial search, and the ERP waveforms of serial search were very similar. The P3 amplitudes increased as the degrees of the difficulty in visual search decreased.     

Picturing the moon: Hevelius’s and Riccioli’s visual debate

This article investigates the maps of the moon produced in the mid-seventeenth century by Jesuit Giambattista Riccioli (1598-1671) and Johannes Hevelius (1611-1687), whose cartographic projects competed for widespread acceptance. Although Hevelius’s Selenographia (1647) was applauded for its many detailed, self-engraved pictures of the moon, his cartography and proposed nomenclature were supplanted by Riccioli’s as offered in Almagestum novum (1651), in spite of the latter’s simplistic pictures and promotion of geocentric cosmology. Exploring this paradox through pictorial analysis, three types of images common to both Selenographia and Almagestum novum are compared, employing an analytical tool developed by Svetlana Alpers in The art of describing (1983). A focus on this debate exposes the tensions evoked by new technologies of vision and competing cultures of visual epistemology in seventeenth-century astronomy. As both selenographers grappled with questions about the role of representation and what kinds of knowledge could be generated visually, the successes and failures of their competing projects present implications for the course of visual astronomy, as well as for our understanding of the use of ‘visual technologies’ in a period of controversy.     

核磁共振成像用磁体的计算机辅助设计

核磁共振成像用的磁体要求在一定的磁场强度下保持大范围的均匀度。本文给出球形空芯磁体和环形空芯磁体的计算机辅助设计方法。     

DEA-based anti-HIV immunotherapy model

Acquiredimmunitydeficiencysyndrome(AIDS)isoneofthemostfataldiseasesthathasspreadacrossthewholeworldsinceitfirstoccurred.Itiscausedbythehumanimmunodeficiencyvirus(HIV)[1].Mostofthechemotherapiesareaimedatkillingorhaltingthepathogen,butanewtreatmentistoreduceviralpopulationandimprovetheimmuneresponse.Thistreatmentcanboosttheimmunesystemandservetohelpthebodyfightinfectiononitsown,soitiscalledantiHIVimmunotherapy[2,3].TheaimofthisworkistofindefficientstrategiesforsuchtreatmentsusingtheDataEnv…     

谈谈多媒体英语教学

文章介绍综合利用软件，创造良好的多媒体英语教学环境的方法和多媒体在英语课堂上的使用，以及多媒体英语教学需要注意的问题。     

数列{N(u,v)=2uv+u+v}的若干性质

本文得出了数列{N（u,v)=2uv u v}的一些性质，并提出了关于素数的一个猜想。     

籽瓜植株(地上部)的生长发育规律

对内蒙古地区有代表性的四个籽瓜品种植株(地上部)的生长发育进行了研究．结果表明：内蒙古籽瓜的全生育期为92-101d，籽瓜植株的生长发育可分为发芽期、幼苗期、伸蔓期和结果期，结果期分为前期(开花座果期)、中期(果实膨大期)、后期(种子成熟期)．发芽期、幼苗期以叶为生长中心，伸蔓期、结果前期以茎为生长中心，进入结果中期以果实为生长中心不同生育分期长短的差异主要表现在结果中期的差异上．     

中小企业ERP实施成因初探

通过对一个中小企业实施ERP的典型案例分析，归纳出了中小企业实施ERP失败的主要原因。并给出了中小企业实施ERP成功的要点。     

由理性到经验--现代数学哲学研究的历史走向

数学基础的研究，形成了逻辑主义、形式主义和直觉主义三大学派，其运用理性主义构造数学，认为数学是一个欧几里得系统。拉卡托斯通过对三大学派所做工作分析之后，认为数学是一个拟经验系统，数学的真理性是被“说明”，而不是被“证明”的，它的发展模式是：问题——猜测——反驳，数学理论具有可证伪性。由理性主义到经验主义是现代数学哲学研究的历史走向，这种走向表明数学在不断追求完美与和谐。     

从数学教育看素质教育与创新教育之关系

结合数学教育近20年改革发展情况,分析了素质教育与创新教育在提出背景、思想认识、物质基础方面的不同点和在培养目标上的共同点———培养学生的创新意识和创新能力,揭示二者的辩证与发展关系.