金盘电子阅览室管理系统使用探讨

在“金盘电子阅览室管理系统”的使用中,探索了谊系统各模块的使用技巧,并对使用中出现的问题提出了解决措施。     

天津电大基于校园网的教育信息系统建设

本介绍了天津电大教育管理信息系统的基本构成，对B／W／RDBMS和C／S两种体系结构进行了分析并提出了校园网络与教育管理信息系统的安全性维护策略。     

Stylistic Features in Robert Frost＇s Poem Nothing Gold Can Stay

罗伯特·弗罗斯特（1874-1963）身为20世纪的诗人，却与其他现代诗人不同。他既有二十世纪的“音调”，又有接近于传统诗歌的诗体。为了说明弗罗斯特诗歌的文体特征，本文试从三个方面对他的诗歌《纯金难留》进行探讨：诗歌的选词、句法结构和语音模式。     

去甲肾上腺素在纳米金修饰玻碳电极上的电化学行为研究

采用电沉积的方式将纳米金固载在玻碳电极表面,制得纳米金修饰玻碳电极(NG/GCE)。研究了去甲肾上腺素(NE)在NG/GCE的电化学行为,发现NG/GCE不仅对NE有良好的催化和富集作用,而且能将NE和抗坏血酸(AA)的循环伏安氧化峰很好地区分开,可在抗坏血酸共存下选择性测定NE。     

活性炭吸附-碘量法测定矿石中的金

本文通过活性炭吸附-碘量法实际应用过程的研究,确定了测定矿石中的金各步骤的最佳分析条件以及在测定过程中应注意的事项.     

Performance analysis of a spreading sequence estimator for spread spectrum transmissions

Direct sequence spread spectrum transmissions (DS-SS) are now widely used for secure communications, as well as for multiple access. They have many interesting properties, including low probability of interception. Indeed, DS-SS transmitters use a periodical pseudo-random sequence to modulate the baseband signal before transmission. A receiver which does not know the sequence cannot demodulate the signal.In this paper, we propose a new method which can estimate the spreading sequence in a noncooperative context. The method is based on eigenanalysis techniques. The received signal is divided into windows, from which a covariance matrix is computed. We show that the sequence can be reconstructed from the two first eigenvectors of this matrix, and that useful information, such as desynchronisation time, can be extracted from the eigenvalues.The main achievement of the present paper is a performance analysis of the proposed spreading sequence estimation procedure. An analytical approach is first considered owing to matrix perturbation theory and Wishart matrix properties. Then, complementary Monte Carlo simulations are performed to show the effectiveness of the proposed method.     

OA系统的规划与设计

本文基于本单位的实际情况,结合目前比较流行的支撑系统新技术,就"OA系统"的体系规划与设计进行研究探索,并提出适合本单位实际情况的设计方案.     

Kalgoorlie as the Global Centre for Gold Metallurgical Innovation 1902-1907

Faced with the problem of how to process valuable refractory sulphide ore in the early 1900s, Kalgoorlie mining engineers and metallurgist, and their consultants, borrowed ideas from a variety of international sources to develop new equipment and new procedures. This paper examines the sources of these innovations and how they spread with remarkable speed through the medium of the tight-knit group of international metallurgical consultants. The inter-relationship between international technological transfer and increased local inventiveness, stimulated by the rapid changes in technology, and the opportunities and limitations experienced by Australian metallurgical inventers in the 1900s are also examined.     

中国蹦床东京奥运会夺金实力分析与备战策略研究

运用文献资料法、专家访谈法等,梳理东京奥运周期蹦床项目竞争格局,分析东京奥运会我国蹦床的夺金实力,全面揭示成套动作难度、飞行时间、完成质量、动作稳定性与奥运夺金之间的内在关系,提出东京奥运会备战策略。研究表明:中国、白俄罗斯、加拿大、日本、俄罗斯这五个国家形成了世界蹦床的领先集团,是东京奥运会金牌的有力争夺国家;在东京奥运周期蹦床世界大赛中男子获得53.33%的金牌,女子获得39.99%的金牌,男女选手均具备冲击奥运会金牌的实力,做好备战和参赛工作尤为重要;面对东京奥运会的激烈竞争,我国蹦床项目要进一步提升备战选手的“高难度、高飞行、高稳定、高质量”。     

印度开放存取现状分析

开放存取运动给印度广泛的学术交流带来了契机，在新的技术和社会各界的支持推动下，印度正在开展OA知识库、OA期刊和开放课件的实践探索，并取得了显著成就。