原型范畴理论视角下的词义扩大与缩小

从原型范畴理论审视词义的扩大与缩小,词义的扩大与缩小,单个词例的纵向发展以及整体现象的横向扩充,都是一个范畴化的过程,进而形成语义范畴;模糊性是它的客观属性。     

文学翻译手法解读--增减法、异化法和灵感现象理论渊源探究

文学翻译是一种文艺创作活动,在翻译文学文本时既需要传递其信息价值,又要传达其美学价值。在这个过程中有三大手法发挥着重要作用,即增减法、异化法和译者灵感现象。增减法的渊源通过对美学接受论和伊瑟尔阅读理论的论述得以明证,康德提出的人类“共通感”的理论则为异化翻译法的合理性及可行性提供了支持,而柏拉图和黑格尔的灵感论则与文学翻译中译者的灵感现象相关。通过以上论证,最终说明文学翻译中运用的上述手法和现象有法可依、有理可据,它们并非无源之水、无本之木。     

试论音响系统中的话筒啸叫

根据啸叫形成原理,对在电子技术层面解决抑制啸叫的几种方案——均衡方式、移频方式、移相方式、参量均衡方式等进行了理论分析。     

Effect of Riboflavin Operon Dosage on Riboflavin Productivity in Bacillus Subtilis

After deregulating the purine and riboflavin synthesis in the Gram-positive bacterium Bacillus subtilis,it is critical to amplify riboflavin operon with appropriate dosage in the host strain for remarkable increase of riboflavin production. Bacillus subtilis RH13, a riboflavin-producing strain, was selected as host strain in the construction of engineering strains by protoplast fusion. The integrative plasmid pRB63 and autonomous plasmid pRB49, pRB62 containing riboflavin operon of B. subtilis 24 were constructed and transformed into the host strain respectively. Increasing one operon copy in B. subtilis RH13 results in about 0. 4 g/L improvement in riboflavin yield and the appropriate number of operon copies was about 7--8. Amplifying more riboflavin operons is of no use for further improvement of yield of riboflavin. Furthermore, excessive operon dosage results in metabolic unbalance and is fatal to the host cells producing riboflavin.     

Social media as amplification station: factors that influence the speed of online public response to health emergencies

Online public response to health emergencies is a major and complex public health issue. This study employs hierarchical linear modeling to investigate the speed of online users’ response to health emergency information on Chinese microblogging sites. The distribution of response speed for all posts is highly skewed. Only a minimal number of posts are forwarded in less than one minute. We further examine the effects of the characteristics of original messages as well as the effects of the factors of reposted messages and information transmitters, to determine the response time of messages on health emergencies. Original messages with different emotional orientations have different response times. The homophily of geographical location among dyadic information transmitters, the addressivity of reposted messages, and the degree of activity and popularity of information transmitters shorten the response time. This study expands the social amplification of risk model to an online context and contributes to the literature on information diffusion by identifying the effects of dyadic relationships among information transmitters. Practical implications are briefly discussed.     

PipeCF： a DHT-based Collaborative Filtering recommendation system

Collaborative Filtering (CF) technique has proved to be one of the most successful techniques in recommendation systems in recent years. However, traditional centralized CF system has suffered from its limited scalability as calculation complexity increases rapidly both in time and space when the record in the user database increases. Peer-to-peer (P2P) network has attracted much attention because of its advantage of scalability as an alternative architecture for CF systems. In this paper, authors propose a decentralized CF algorithm, called PipeCF, based on distributed hash table (DHT) method which is the most popular P2P routing algorithm because of its efficiency, scalability, and robustness. Authors also propose two novel approaches: significance refinement (SR) and unanimous amplification (UA), to improve the scalability and prediction accuracy of DHT-based CF algorithm. The experimental data show that our DHT-based CF system has better prediction accuracy, efficiency and scalability than traditiona     

宽带啁啾脉冲放大理论研究

从麦克斯韦方程组出发,推导了宽带啁啾脉冲放大的理论模型方程.该方程和非线性Schr dinger方程有相同的形式,可用分步傅里叶算法对其在数值上求解.     

关于求解放大电路静态工作点的方法

以分压式偏置电路为例 ,采用戴维南定理、基尔霍夫定律和节点电位法等理论 ,讨论了求解放大电路的静态工作点     

体育馆扩声系统的备份设计与实现——以北京五棵松凯迪拉克中心为例

针对当前体育馆的使用、扩声技术应用的特点,以北京五棵松凯迪拉克中心扩声系统安全性的设计为例,分析系统的多重主备架构设计思路及主备切换方式的实现。     

龙竹和麻竹FT同源序列的扩增与序列分析

根据拟南芥Flowering Locus T（FT）基因和水稻Heading date 3a（Hd3a）基因的序列设计引物,通过PCR扩增的方法分别从麻竹和龙竹基因组DNA中各得到长为334bp的DNA片段.经BLAST检索、基因结构分析和编码蛋白功能域预测等分析,初步确定所得DNA片段可能是麻竹和龙竹中的FT同源基因的部分序列.