社会化阅读视角下阅读推广用户满意度影响因素研究

本研究利用质性研究方法,从原始访谈资料中概括总结社会化阅读视角下阅读推广用户满意度的影响因素,得出阅读效率、阅读社交性、阅读注定性3个范畴,并以之为变量构建公共图书馆阅读推广用户满意度影响因素模型;利用实证研究方法,运用结构方程分析了阅读效率、阅读社交性、阅读注定性对用户满意度的影响效果。通过定性与定量方法结合的研究过程及结果,对公共图书馆阅读推广工作的发展提出了建设性意见。     

运用博弈论组合赋权法的图书馆藏优化研究——以河北工业大学图书馆为例

[目的/意义]借鉴博弈论中的均衡思想,对图书馆图书采购经费经不同角度确定的权重进行量化客观组合方法的研究。[方法/过程]运用博弈论组合赋权法构建对策模型,提出利用内点罚函数法对模型进行求解,实现了不同角度权重的集化,并以河北工业大学为例进行实例分析。[结果/结论]通过实例分析,验证了本文方法的可行性,避免了人为主观确定权重对结果的影响,为图书采购经费的优化配置提供了一种新思路。     

Leakage Rate Model of Urban Water Supply Networks Using Principal Component Regression Analysis

To analyze the factors affecting the leakage rate of water distribution system, we built a macroscopic "leakage rate–leakage factors"(LRLF) model. In this model, we consider the pipe attributes(quality, diameter,age), maintenance cost, valve replacement cost, and annual average pressure. Based on variable selection and principal component analysis results, we extracted three main principle components—the pipe attribute principal component(PAPC), operation management principal component, and water pressure principal component. Of these, we found PAPC to have the most influence. Using principal component regression, we established an LRLF model with no detectable serial correlations. The adjusted R2 and RMSE values of the model were 0.717 and 2.067, respectively.This model represents a potentially useful tool for controlling leakage rate from the macroscopic viewpoint.     

Error-driven nonlinear feedback-based fuzzy adaptive output dynamic surface control for nonlinear systems with partially constrained tracking errors

In this paper, a novel error-driven nonlinear feedback technique is designed for partially constrained errors fuzzy adaptive observer-based dynamic surface control of a class of multiple-input-multiple-output nonlinear systems in the presence of uncertainties and interconnections. There is no requirements that the states are available for the controller design by constructing fuzzy adaptive observer, which can online identify the unmeasurable states using available output information only. By transforming partial tracking errors into new error variables, partially constrained tracking errors can be guaranteed to be confined in pre-specified performance regions. The feature of the error-driven nonlinear feedback technique is that the feedback gain self-adjusts with varying tracking errors, which prevents high-gain chattering with large errors and guarantees disturbance attenuation with small errors. Based on a new non-quadratic Lyapunov function, it is proved that the signals in the resulted closed-loop system are kept bounded. Simulation and comparative results are given to demonstrate the effectiveness of the proposed method.     

Modeling and switching control of air-breathing hypersonic vehicle with variable geometry inlet

In this paper, a multi-model switching control is developed for air-breathing hypersonic vehicle with variable geometry inlet(AHV-VGI). A variable geometry inlet with the translating cowl is adopted to capture the enough air mass flow for the scramjet engine, which can ensure a more powerful thrust. However, the using of VGI causes the unknown changes of the aerodynamics and thrust, making the model of AHV more complex. Therefore, we firstly analyze the thrust characteristic with the translating cowl and present the conception of optimal elongation distance of translating cowl(EDTC). Consequently, multiple different nonlinear aerodynamic models are constructed by curve fitting for each position of the translating cowl. Then, a switching mechanism dependent on EDTC is proposed and the adaptive RBF neural controllers are designed for velocity subsystem and altitude system of every model. Furthermore, the common Lyapunov functional is constructed to prove the stability of the multi-model switching process. Finally, numerical simulations are given to demonstrate the effectiveness of the proposed control approach for AHV-VGI.     

近五年国内外信息素养教育研究进展及展望

[目的/意义]梳理信息素养教育研究的现状,针对主要问题进行思考与展望,以期为未来我国高校图书馆信息素养教育研究和实践提供参考。[方法/过程]采用文献调研方法,对现有国内外信息素养教育内容、教育模式进行归纳和总结,并分析这些研究的特点及经验。[结果/结论]结合新环境、新理论和《高等教育信息素养框架》,拓展数据素养、元素养等教育内容;从学习者的学习出发,寻求"MOOC"翻转课堂"等适当且多元的教育模式;提出应抓住人工智能时代到来的新机遇,关注信息素养教育新动向的建议。（请作者仔细核对摘要部分）     

“双一流”建设背景下国内财经类高校图书馆学科服务的问题与优化分析

[目的/意义] 探讨"双一流"建设背景下国内首批获准进行一流学科建设的财经类院校图书馆学科服务的现状及在新一轮学科建设中暴露的弊端,提供优化与改进措施以使其更好地服务于一流学科建设。[方法/过程] 以首批获准进行一流学科建设的财经类院校为例,采取网站调查和文献研究方法,发现这些高校图书馆学科馆员制在理念、制度、服务上存在着明显的问题。[结果/结论] 这些高校图书馆需要进行相应的理念优化、制度优化和服务优化,包括制度上的存在性优化和完善性优化以及服务上的对象优化、内容优化、方式优化等。     

Electrocardiogram (ECG) patterns of left anterior fascicular block and conduction impairment in ventricular myocardium: a whole-heart model-based simulation study

Left anterior fascicular block (LAFB) is a heart disease identifiable from an abnormal electrocardiogram (ECG). It has been reported that LAFB is associated with an increased risk of heart failure. Non-specific intraventricular conduction delay due to the lesions of the conduction bundles and slow cell to cell conduction has also been considered as another cause of heart failure. Since the location and mechanism of conduction delay have notable variability between individual patients, we hypothesized that the impaired conduction in the ventricular myocardium may lead to abnormal ECGs similar to LAFB ECG patterns. To test this hypothesis, based on a computer model with a three dimensional whole-heart anatomical structure, we simulated the cardiac exciting sequence map and 12-lead ECG caused by the block in the left anterior fascicle and by the slowed conduction velocity in the ventricular myocardium. The simulation results showed that the typical LAFB ECG patterns can also be observed from cases with slowed conduction velocity in the ventricular myocardium. The main differences were the duration of QRS and wave amplitude. In conclusion, our simulations provide a promising starting point to further investigate the underlying mechanism of heart failure with LAFB, which would provide a potential reference for LAFB diagnosis. the angulation of impaction having little effect on facture risk.     

社会化媒体中的高校教学价值共创与教学效果——基于宁波高校样本的研究

以拥有社会化媒体账号的宁波高校师生为样本,对基于社会化媒体的高校教学价值共创的前置因素及其对教学效果的影响进行了模型构建和实证分析.数据分析结果显示,师生参与通过实用价值、社交价值和内容价值共创而积极影响师生满意和信任,进而积极影响学生学习成绩和教师工作绩效;而心理契约和感知匹配通过实用价值、娱乐价值、社交价值和内容价值共创而积极影响师生满意和信任,进而积极影响学生学习成绩和教师工作绩效.由此建议在从事基于社会化媒体的高校教学活动时,要把握价值共创的维度,识别价值共创的前置因素,关注价值共创对教学效果的影响.     

美国教师专业发展学校(PDS)研究回顾

教师专业发展学校是20世纪80年代末期产生于美国的一种强调大学与中小学合作,以中小学为基地并且融教师职前培养、在职培训和学校改革为一体的新型教师培养模式,发展至今已经成为美国常见的一种教师教育模式。本文对美国关于教师专业发展学校研究的相关文献进行了梳理与总结,整理出了美国20多年对其研究的内容和成果,并且针对以上的研究内容给出了自己的建议。