交换式以太网的规模局限性及解决方案

交换式以太网技术在传统以太网技术的基础上 ,以其灵活的组网方式及高效的宽带利用方式已经越来越广泛的成为当今局域网实现的主流技术。但是当仅仅使用以太网交换机实现大型的局域网时 ,仍然存在着路由环路、广播风暴等问题 ,本文主要阐述大型交换式以太网的性能问题及其解决方法     

论马克思主义法学的产生标志

《德意志意识形态》标志着马克思主义法学的产生。因为：它首次系统地论述了唯物史观的基本原理，为马克思主义法学产生提供了哲学基础；它第一次阐明了法律起源、本质、作用等法学基本问题和基本原理，它作为产生标志也符合理论发展规律和历史实际情况。     

论以人为本与中国特色社会主义

以人为本作为一种社会思潮和价值观念早已有之。马克思主义运用历史唯物主义原理,第一次阐明了这一概念的科学内涵。新中国建国后,我党三代领导人从不同的角度都有过论述。党的十六大以来,以胡锦涛为总书记的党中央发展了这一思想。胡锦涛在党的十七大报告中明确提出,建设和发展中国特色社会主义必须坚持以人为本,他结合实际,赋予了以人为本以新的时代内涵,将其确立为中国特色社会主义的价值目标,中国特色社会主义的出发点和落脚点,强调必须坚持以人为本,全面推进中国特色社会主义事业的进步与发展。     

论四川当代彝族汉语诗歌的文化构成

四川当代彝族诗人们接受和借鉴大量的中外文学艺术成就,从而拓宽了艺术视野,升华了审美境界,丰富了审美内涵;同时在创作中也更深入到本民族文化传统的底部,重新体味民族文化精神实质,以全新的感觉方式去领悟传统民族文化的精神底蕴。他们的文学创作,必然地逐步走向了多元同构的发展趋势。     

从中国文化中找寻西方文化的“不可能性”——美国学者孟旦对中国哲学中“人”之概念的研究

美国学者孟旦对中国哲学中"人"之概念有着很深的研究,他以"人性"作为研究中西哲学的契合点,从中国文化中寻找那些西方文化中的"不可能性":"天人合一"、"物我不分"、"事实与价值相混淆"、"帝国式求索模式"的思维方式以及"意识簇"的认知方式等,从而说明中西文化之间的相互补充和交融性。     

从中国文化中找寻西方文化的"不可能性"——美国学者孟旦对中国哲学中"人"之概念的研究

美国学者孟旦对中国哲学中"人"之概念有着很深的研究,他以"人性"作为研究中西哲学的契合点,从中国文化中寻找那些西方文化中的"不可能性":"天人合一"、"物我不分"、"事实与价值相混淆"、"帝国式求索模式"的思维方式以及"意识簇"的认知方式等,从而说明中西文化之间的相互补充和交融性.     

QTL analysis of flag leaf in barley (Hordeum vulgare L.) for morphological traits and chlorophyll content

To understand genetic patterns of the morphological and physiological traits in flag leaf of barley, a double haploid (DH) population derived from the parents Yerong and Franklin was used to determine quantitative trait loci (QTL) controlling length, width, length/width, and chlorophyll content of flag leaves. A total of 9 QTLs showing significantly additive effect were detected in 8 intervals on 5 chromosomes. The variation of individual QTL ranged from 1.9% to 20.2%. For chlorophyll content expressed as SPAD value, 4 QTLs were identified on chromosomes 2H, 3H and 6H; for leaf length and width, 2 QTLs located on chromosomes 5H and 7H, and 2 QTLs located on chromosome 5H were detected; and for length/width, 1 QTL was detected on chromosome 7H. The identification of these QTLs associated with the properties of flag leaf is useful for barley improvement in breeding programs. Project supported by the National Natural Science Foundation of China (No. 30630047) and the Project on Absorption of Intellects by Institutions of Higher Education for Academic Disciplinary Innovations (the 111 Project) (No. B06014), China     

The association of precollege use of calculators with student performance in college calculus

This study investigates how the use of calculators during high school mathematics courses is associated with student performance in introductory college calculus courses in the USA. Data were drawn from a nationally representative sample of 7087 students enrolled in college calculus at 134 colleges and universities. They included information about students’ demographics, standardized test scores, and high school mathematics course enrollment and performance. Factor analysis reduced ten items describing high school calculator usage to two composites: how extensively calculators were employed and teacher-imposed restrictions on their use. Hierarchical linear models predicted students’ college calculus grades, reported by their professor, while controlling for differences between colleges and student backgrounds. The more extensively students had used calculators in high school, the lower their grade in college calculus. However, students earned higher college calculus grades to the extent that their high school teachers had limited calculator use on quizzes and exams and had restricted calculator use until paper-and-pencil methods had been mastered, which offset the negative association of extensive calculator use with grades. The effect sizes of both calculator composites were very small. Overall, the findings raise doubts about any substantial long-term effects on college mathematics performance of calculator use in high school.     

Application of Hilbert-Huang signal processing to ultrasonic non-destructive testing of oil pipelines

INTRODUCTION Ensuring the integrity and safe operation of oil pipelines network is critical for ensuring the trans- portation of one of the most important forms of en- ergy. An inspection vehicle, called intelligent pig, which employs ultrasonic non-destructive testing technique is often used to inspect oil transmission pipelines (Okamoto et al., 1999; Reher et al., 2002). The ultrasonic detection principle involves the fun- damental concept that a propagating wave will be reflected and/o…