一种宽频带频率源的设计与实现

频率源是现代通信系统中不可或缺的一部分,在卫星通信、数字通信、雷达和导航等领域有着广泛的应用。本文给出了一种利用TI MSP430控制ADF4350设计频率合成器的方法,然后利用ADIsimPLL软件对其性能进行了仿真,最后,通过制作电路板,对其性能进行了实际测试。测试结果表明,该频率合成器具有较好的杂散水平和较低的相位噪声,能够满足教研室宽频带多制式软件无线电样机的本振源的要求。     

F1赞助商的行业类别及其与该赛事的关联度

运用文献资料、专家访谈等研究方法,归纳了F1赞助商的行业类别,据此提出赞助商的行业类别与F1赛事的关联度。还分析了我国高关联度企业赞助F1赛事的趋势,并为取得更好的赞助效果提出了若干建议。     

Solomon ben Joseph ha-Kohen on Fāṭimid Victory: A Hebrew Ode to al-Mustanṣir Billāh and Badr al-Jamālī Reconsidered

Abstract

This article presents a vocalised edition (on the basis of MS T.-S. Misc. 36.174, Cambridge University Library) and a revised translation of a Hebrew ode written on the occasion of the Fā?imid victory over the invading Saljūq army in Cairo in 469/1077. Elaborating on earlier research on the Cairo Genizah treasures starting with Julius H. Greenstone's 1906 paper, the article first of all aims to present whatever historical data can be obtained about the poet, Solomon ben Joseph ha-Kohen, and about the time period and the circumstances in which he must have written his poem, which is addressed to the Fā?imid caliph al-Mustan?ir Billāh and his vizier Badr al-Jamālī. Other major objectives of the article are the identification of other historical persons and events alluded to in the praise poem, a literary analysis of the ode within the conceptual framework of “martial poetry”, and an examination of its laudatory or propagandistic aspects.     

Coptic Language and Identity in Ayyūbid Egypt1

Abstract

In the late Fā?imid and Ayyūbid periods of Egyptian history, Coptic Christians finally addressed the reality that most of their community no longer understood the Coptic language but were, in fact, losing their communal identity and “figures of memory” to Arabisation and even Islamisation. A Coptic-Arabic “Renaissance” ensued whereby Coptic liturgy, theology and history were translated into Arabic, the lingua franca by this time of the Coptic populace. This creative energy extended into the artistic realm – such as iconography and painting – and ultimately strengthened the identity of the Coptic community as their situation became increasingly more restricted.     

新闻内容分析的信度和效度

从样本选取、类另9建构和编码、数据解释三个方面剖析了两篇关于运用内容分析法分析美国媒体对中国SARS事件报道的研究论。认为要保证内容分析研究的信度和效度,样本的选取应该具有代表性;研究类另4建构应该抓住问题实质,归类必须详尽并且互斥;对数据的解释需要结合恰当的理论框架并置入历史脉背景之中。     

10年来我国高等教育理论研究的趋势分析——一种结构式的定量研究

运用结构式定量研究方法,对我国1996～2005年的高等教育学理论文献,从文章题目、作者、摘要、关键词、课题、问题的提出、重要术语界定、研究方法、结论、参考文献或注释等10个维度进行评价和分析.研究结果表明:10年来我国高等教育学的研究水平有了很大提高,理论水平不断提升,学术规范正逐步形成和确立.     

行动研究法的历史演变及其对我国中小学教师研究的启示

行动研究法直接涉及中小学教师的研究活动,它在现代西方基础教育领域经历了兴起,衰落和复兴的历史演变过程。本文首先对这一过程作深入考察,然后借鉴其经验和教训,指出我国中小学教师的研究要走出目前的困境,必须坚持目的上的应用性,动机上的高尚性,方法上的通俗性和过程上的自主性。     

基于单片机的实用多路A／D转换电路

介绍了一种基于单片机控制的实用多路 Ａ／Ｄ转换电路的特点及实现方法,从测量精度和测量速度二个方面进行了探讨．电路结构简单便于与微机接口．     

The changing scenario in diagnosing prostate cancer

Fifty patients were evaluated for serum total PSA (Prostate Specific Antigen), free PSA (f-PSA), free/total PSA ratio (f/t PSA ratio) and TPS^TM (Tissue Polypeptide Specific Antigen). Fifty patients were clinically evaluated and categorized into BPH (benign prostatic hypertrophy) and CaP (carcinoma prostate) with twenty-five in each category before the serological examination. Serum total PSA concentration is elevated in 80% of BPH cases while it was elevated in all cases of CaP. With total PSA>10ng/mL, f/t PSA ratio was not applicable. For TPS^TM, a cell proliferation marker these values were 32% and 92% respectively. The advanced cases of CaP were reflected by the pronounced elevations of PSA and TPS^tM while f/t PSA ratio was much below the cut-off limit (cut-off limit=0.14). The data suggest that whentotal PSA concentration <10ng/mL, f/t PSA ratio plays a very important role in discriminating BPH and CaP. However, TPS^TM can be used as a valuable adjunct in diagnosis and follow-up of prostate cancer patients, especially in differentiating benign from malignant cases.     

背越式跳高“小弧线教学法”原理与应用

笔者通过对体院学生背越式跳高常见错误动作类型及其产生原因的调查分析 ,根据小弧线助跑的生物力学原理与动作技能学习的类属同化理论 ,提出了背越式跳高的“小弧线教学法”及其应用原则。认为小弧线助跑可以使身体获得较大的内倾 ,可帮助初学者较好地体会和掌握助跑的节奏与起跳过杆技术 ,从而有利于提高背越式跳高教学效果