英汉双向PC电子词典的现状与发展趋势

英汉双向PC电子词典逐步形成目前我国电子词典发展的主流。纵向分析了这类电子词典的定义、分类、系统、基本结构、内容、性能特征等,并以典型的英汉双向PC电子词典类软件为基础进行横向对比,揭示了该类词典的发展趋势,同时指出英汉双向PC电子词典的发展尚属初级阶段。     

Preparation of nano-compounded polyolefin materials through in situ polymerization technique: status quo and future prospects

Nano-compounding of polyolefins, an economical yet very effective route to high-performance polyolefin materials, has received considerable attention in recent years. Unlike most of the other polymers, polyolefins are chemically inert, which dictates that nano-compounding of polyolefins has to be conducted via in situ polymerization. In this review, a technological progress of the nano-compounding of polyolefins via in situ polymerization technique was summarized thoroughly, with emphasis laid on the current research status of polyolefin/montmorillonite (MMT) nanocomposites. A clear perspective for future researches on this specific family of materials was envisaged. Supported by National Natural Science Foundation of China (Grant No. 50373048) and State Key Development Program of Basic Research Program of Ministry of Science and Technology of China (Grant No. G2003CB615600)     

Optimal forecast combination based on ensemble empirical mode decomposition for agricultural commodity futures prices

Improving the prediction accuracy of agricultural product futures prices is important for investors, agricultural producers, and policymakers. This is to evade risks and enable government departments to formulate appropriate agricultural regulations and policies. This study employs the ensemble empirical mode decomposition (EEMD) technique to decompose six different categories of agricultural futures prices. Subsequently, three models—support vector machine (SVM), neural network (NN), and autoregressive integrated moving average (ARIMA)—are used to predict the decomposition components. The final hybrid model is then constructed by comparing the prediction performance of the decomposition components. The predicting performance of the combination model is then compared with the benchmark individual models: SVM, NN, and ARIMA. Our main interest in this study is on short-term forecasting, and thus we only consider 1-day and 3-day forecast horizons. The results indicate that the prediction performance of the EEMD combined model is better than that of individual models, especially for the 3-day forecasting horizon. The study also concluded that the machine learning methods outperform the statistical methods in forecasting high-frequency volatile components. However, there is no obvious difference between individual models in predicting low-frequency components.     

浅论"资金时间价值"

探讨了资金时间价值的概念,资金时间价值的衡量指标之一年金的要领种类,着重对年金 值、年金现值的计算公式进行了推导。     

工程结构可靠度理论的研究现状与展望

对结构可靠度理论及应用的国内外研究现状进行了概括性总结;简要叙述了可靠度理论在我国工程结构设计规范的发展中所起的推动作用;提出结构可靠度理论将朝着正常使用极限状态结构的可靠度、结构的疲劳可靠度、结构的模糊可靠度、结构的动力可靠度、结构的体系可靠度等方向进行研究,以期为我国在这方面研究的进一步发展提供参考.     

数字图书馆与图书馆的未来

分析了数字图书馆的几个基本特征 ,阐述了数字图书馆的研究进展及取得的成果。同时论述了数字图书馆的建设对图书馆未来工作带来的影响及挑战     

当代新型智慧城市属性、理念、构筑与大数据

互联网、信息化、智能化-大数据迅猛发展,倒逼新型智慧化城市生长再造,同时大数据已进入各行各业、个人与群体、科学与技术,即工、农、兵、学、商各界,海、陆、空各领域都呈现着互联网、大数据的声响,它已成为现代化智慧城市不可或缺的载体、发展与创造的驱动引擎。基于当今互联网-大数据发展日新月异。分析各种报道,理解与认知、集成与研究,其内涵表明:①现代化智慧城市必须以互联网为载体,为一个复杂的巨型系统工程;②现代化的智慧城市必须更好地为人民服务,使人民得到更多的获得感,能够安居乐业;③现代化的智慧城市必须具有良好的生态环境与之相匹配;④现代化的智慧城市必须是地上、地下、空中与海域高度协调与融合的三维发展模式;⑤现代化的智慧城市必定是在科学与技术上不断创造未来的,为造福于民的幸福之所、强国的奋斗之源地。     

析基于博弈论的网络团购问题

作为新时代的产物,网络团购深受消费者与商家的喜欢。消费者通过网络平台自发组团与商家进行交易,亦或通过各类网站申请成为会员,直接参团购买。但就是这种改变传统的商业模式引发当前的种种质疑。文章通过博弈理论,分析网络团购的问题关键,并进一步探讨解决问题的方法,以促进网络团购的健康发展。     

电信增值业务及未来发展趋势

在一个新的通信业大发展时代,单纯的语音服务已不能满足用户对通信的需求,人们已从过去单纯的满足话音和沟通功能转向应用和服务的更高层次。伴随着人们的需求成长起来的电信增值业务为整个电信产业带来了转机和希望。     

冯友兰“开来”、“继往”的现代观

冯友兰是一位主动探取西方思想资源的现代新儒家,其现代观是在中西思想激荡中形成的。冯友兰注重社会＂新性＂,其所论说的＂新性＂,不仅是从逻辑原点上说,更是从实践层面的一国、一民族及社会改革层面上说的;他依据社会＂新性＂来论述其开来、继往的现代观,其精彩之处,就在用开来与继往的辩证过程来表征＂革命＂这一范畴,他认为若忽视了革命亦是继往,则对于社会上的变革,必将产生误解。冯友兰对＂制度＂演进有深刻的认识,他以现代制度演进的实例,来支撑其社会＂新性＂的原理,这其实是冯氏的深刻之处。将辛亥革命视为中国现代化的步骤,则显示了冯友兰的理论卓见。