教学资源库检索系统评价及其优化策略研究——以广州“教育E时代”主题资源库为例

本文从用户利用的角度,以广州"教育E时代"主题资源库检索系统为例,通过评价指标体系构建,抽样问卷调查和重点用户访谈等方式,全面评价教学资源库各项指标性能。针对用户使用过程中存在的种种问题,相应提出了增加本地资源、优化分类体系和数据存储格式、优化检索窗口设计、简化检索界面、增强系统交互性等策略。     

基于直接寻找法的电阻抗断层成像

Solution to impedance distribution in electrical impedance tomography （EIT） is an ill-posed nonlinear inverse problem. It is especially difficult to reconstruct an EIT image in the center area of a measured object. Tikhonov regularization with some prior information is a sound regnlarization method for static electrical impedance tomography under the condition that some true impedance distribution information is known a priori. This paper presents a direct search method （DSM） as pretreatment of image reconstruction through which one not only can construct a regularization matrix which may locate in areas of impedance change, but also can obtain an initial impedance distribution more similar to the true impedance distribution, as well as better current modes which can better distinguish the initial distribution and the true distribution. Simulation results indicate that, by using DSM, resolution in the center area of the measured object can be improved significantly.     

中学体育教师学校生态环境感知的调查分析与对策研究

采用资料法、逻辑法、测量和统计等方法,并应用自编的《中学体育教师学校生态环境感知量表》测量了福建省中学体育教师学校生态环境感知的总体情况。对不同特征的中学体育教师学校生态环境感知情况进行了差异性检验;针对调查结果提出调控策略。     

Comparison of epidemiological and clinical characteristics of COVID-19 patients with and without Wuhan exposure

Journal of Zhejiang University-SCIENCE B - A novel coronavirus called severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), first identified in Wuhan, China, has been rapidly spreading...     

如何提高植物实验课的教学质量

针对中学植物学实验课教学存在的问题 ,抓好实验课教学的几个关键环节 ,对实验课的教学方法、教学形式等进行改革 ,提高实验课教学质量 ,提高学生的实验能力和实验素质。     

Fiber optic biosensor of immobilized firefly luciferase

Luciferase from firefly lantern extract was immobilized on CNBr-activated Sepharose 4B. The kinetic properties of immobilized luciferase were extensively studied. TheK _m′ for D-luciferin is 11.9 μmol/L, the optimum pH and temperature for Sepharose-bound enzyme were 7.8 and 25°C respectively. A luminescence fiber optic biosensor, making use of immobilized crude luciferase, was developed for assay of ATP. The peak light intensity was linear with respect to ATP concentration in range of 10⁻⁹–10⁻⁵ mol/L. A biological application was also demonstrated with the determination of serum ATP from rats bred in low versus normal oxygen environments.     

中日文化产业政策比较研究——基于《文化产业振兴规划》和《内容产业促进法》之比较

《文化产业振兴规划》和《内容产业促进法》是中日两国最新出台的文化产业政策和法规,通过比较两者的出台背景、文本结构和政策内容,来加深对我国文化产业政策的全面认识和理解,也希冀能从日本的文化产业政策中借鉴一些有益经验。     

基于DEA分析的制造业企业信息化建设效率评价研究

本文利用数据包络分析(DEA)及计量经济学方法．通过对19家制造业上市公司信息化相对效率评价的实证研究．结合其生产与经营特点．分析企业发展中存在的问题，提出了制造业企业信息化建设进一步完善与发展的对策建议。     

消费者归因理论解析王老吉的USP

归因,是指人们时他人或自己行为因为的推理过程.消费者归因是企业帮助消费者从有利于消费者、产品、企业、品牌的角度思考信息,解释信息的过程."怕上火,喝王老吉"是王老吉的USP(独特的销售主张),王老吉的成功从很大程度上取决于企业的消费者归因.     

生态图书馆建设研究

基于生态图书馆建设研究的现状,提出建设生态图书馆所需要具备的生态理念、功能理念和管理理念,综合生态图书馆建设的主要理念,以生态建筑学理论、人文生态学理论和信息生态学理论为基础,探讨生态图书馆的自然生态建设、人文生态建设和信息生态建设。