地源热泵系统的推广优势及存在的问题

地源热泵系统为一种能提供新型的清洁可再生能源的环保系统.简要介绍了地源热泵系统的定义、类型、组成及工作原理,对比传统的空气源热泵的优缺点,详细阐述了地源热泵系统的众多优势,并指出了其在发展和推广应用中所面临的多方面问题,对地源热泵系统的推广应用提出了一些建议.随着技术的不断完善,地源热泵系统必然有着很好的发展前景.     

Improved spectrum sharing algorithm based on feedback control information in cognitive radio networks

In order to avoid the system performance deterioration caused by the wireless fading channel and imperfect channel estimation in cognitive radio networks, the spectrum sharing problem with the consideration of feedback control information from the primary user is analyzed. An improved spectrum sharing algorithm based on the combination of the feedback control information and the optimization algorithm is proposed. The relaxation method is used to achieve the approximate spectrum sharing model, and the spectrum sharing strategy that satisfies the individual outage probability constraints can be obtained iteratively with the observed outage probability. Simulation results show that the proposed spectrum sharing algorithm can achieve the spectrum sharing strategy that satisfies the outage probability constraints and reduce the average outage probability without causing maximum transmission rate reduction of the secondary user.     

基于GO-FLOW法的苹果冷链物流系统安全性评价

应用系统可靠性理论,利用GO-FLOW方法对苹果冷链物流系统进行安全性分析和风险评价,进行GO-FLOW程序运算,分析系统各环节的可靠性和故障率,找出了影响系统安全性的关键环节并提出了解决思路.     

微合金非调质40Mn2V钢管的变形抗力研究

采用Gleeble-1500 热模拟实验机对微合金非调质40Mn2V钢管的变形抗力进行了研究.结果表明,变形温度越高,变形速率越低,钢管变形抗力越小.变形抗力对数值lnσ随着温度升高和变形速率对数值lnε·的增大,分别呈线性减小和线性增大,且变形抗力与变形程度呈非线性关系.采用Matlab软件拟合出了微合金非调质40Mn2V钢管的变形抗力公式,其拟合度R为0.966 3.     

论高校数字化图书馆建设的现状和对策

阐述了高校数字图书馆评价指标体系的构成,探讨了当前高校数字图书馆建设的现状及其存在的问题,提出了完善高校数字图书馆建设的对策.     

浅谈高校图书馆轮岗机制的引入

阐述了高校图书馆引入轮岗机制的可行性和必要性，提出了在高校图书馆引入轮岗机制的具体措施。     

大城市边缘区小城镇发展模式研究

随着大城市的快速发展，一方面表现为城市GDP的持续快速增长，另一方面表现为城市辐射力以前所未有的速度进行扩大，城市边缘区小城镇已成为城市发展中最敏感性的地域。边缘区小城镇发展模式的选择，对自身以及所属的大城市的发展都有举足轻重的作用。该文分析了现有大城市边缘区小城镇主要的发展模式，以及大城市边缘区小城镇如何去选择发展模式，然后以合肥市三河镇为例，探讨其发展模式的选择。     

Proteome changes in the plasma of Papilio xuthus (Lepidoptera: Papilionidae): effect of parasitization by the endoparasitic wasp Pteromalus puparum (Hymenoptera: Pteromalidae)

Although the biochemical dissection of parasitoid-host interactions is becoming well characterized, the molecular knowledge concerning them is minimal. In order to understand the molecular bases of the host immune response to parasitoid attack, we explored the response of Papilio xuthus parasitized by the endoparasitic wasp Pteromalus puparum using proteomic approach. By examining the differential expression of plasma proteins in the parasitized and unparasitized host pupae by two-dimensional (2D) electrophoresis, 16 proteins were found to vary in relation to parasitization compared with unparasitized control samples. All of them were submitted to identification by mass spectrometry coupled with a database search. The modulated proteins were found to fall into the following functional groups: humoral or cellular immunity, detoxification, energy metabolism, and others. This study contributes insights into the molecular mechanism of the relationships between parasitoids and their host insects.     

以人为本 构建和谐图书馆

文章论述了在以构建社会主义和谐社会为主题的今天，图书馆要确立以人为本的管理理念和服务观念，构建和谐图书馆，更好地为读者服务。以人为本包含两方面内容：一是作为服务客体的读者；二是作为服务主体的图书馆员。     

五四小说纯雅身份的形成

在中国古代，诗歌是纯雅文学，与经国伟业相联系，相比之下，小说则地位低下，属街谈巷议、稗官野史之类，难人大雅之堂。然而，五四新文化运动后情况发生了变化，古代读书人所瞧不起的小说不仅逐渐位居文坛中心，而且由发生学意义上的“俗文学”升格为“纯文学”，担当起启蒙之使命，获得了现代“纯雅”文学的身份。