校园“指尖文化”兴起--基于在校大学生触屏手机及平板电脑使用情况的调查

随着信息化时代的来临,大学生使用触屏手机和平板电脑等触控式智能设备已成为高校校园的普遍现象,校园“指尖文化”由此兴起。调查发现,大学生过度使用智能手机和平板电脑,对其身体健康、心理健康和学业学习都产生消极影响。需要学校、家庭、教师和大学生自身共同努力,扬其长避其短,合理使用触屏手机和平板电脑等触控式智能设备。     

Vapor-liquid equilibrium simulation of binary and ternary mixtures of CH4, C2H4 and iso-C4H10

The vapor-liquid equilibrium（VLE） properties for the binary and ternary mixtures of CH4,C2H4 and isoC4H10 are of great importance in the recovery of ethylene from mixture containing CH4 and C2H4 with iso-C4H10 as solvent.Hence,Gibbs ensemble Monte Carlo（GEMC） simulations were used to estimate vapor-liquid equilibrium for the binary and ternary mixtures of CH4,C2H4 and iso-C4H10 with the united atom potential NERD model.The selected simulation conditions are based on the experiment in the literature.The results of this work were shown to be in satisfactory agreement with available experimental data and predictions of Peng-Robinson equation of state.The structure of simulated liquid phase is also characterized by radial distribution function（RDF）,which contributes to further understanding of the VLE curve of these systems.RDF is not sensitive to the pressure and temperature range.With the increase of pressure or the decrease of temperature,the molecules tend to gather together.     

Direction-Based Adaptive Switching Filter for Removing High-Density Impulse Noise

A direction-based adaptive switching(DBAS) filter is presented for the removal of high-density impulse noise in images. The extrema detection and 28-directional detection are employed to discriminate the pixels as noisy or noise-free. If a pixel is classified as noisy, it will be replaced by a median or a mean value within an adaptive filter window with respect to different noise densities. Simulation results show that the miss-detection ratio and false-alarm ratio are both very low even at noise level as high as 90%. At the same time, better results are obtained in terms of the qualitative and quantitative measures. The peak signal-to-noise ratios increase by nearly 1 dB compared with other existing algorithms. In addition, the computation time is around 10 s for test images with resolutions of 512×512since the proposed approach has low complexity.     

Three-step damage identification method based on dynamic characteristics

A three-step damage identification method based on dynamic characteristics is proposed to improve the structure reliability and security and avoid serious accident. In the proposed method, the frequency and difference of modal curvature （DMC） are used as damage indexes. Firstly, the detection of the occurrence of damage is addressed by the frequency or the square of frequency change. Then the damage location inside the structure is measured by the DMC. Finally, with the stiffness reduction rate as a damage factor, the amount of damage is estimated by the optimization algorithm. The three-step damage identification method has been validated by conducting the simulation on a cantilever beam and the shaking table test on a submerged bridge. The results show that the method proposed in this paper can effectively solve the damage identification problem in theory and engineering practice.     

基于元分析的用户在线信息搜寻意愿影响因素研究

[目的/意义] 在线信息搜寻行为一直以来都是用户信息行为研究领域备受关注的焦点问题,既有文献对在线信息搜寻意愿的影响因素认定存在差异,进一步明确各影响因素的整体效应值,可为深入理解用户在线信息搜寻意愿提供系统性参考。[方法/过程] 选择影响用户在线信息搜寻意愿的8个前因变量、5个调节变量,纳入104篇研究文献的178个独立效应值进行元分析。[结果/结论] 感知风险（r=0.166）、自我效能（r=0.309）、感知有用性（r=0.509）、感知易用性（r=0.384）、信源可信度（r=0.441）、信息质量（r=0.466）、信息素养（r=0.389）以及焦虑情绪（r=0.244）对用户在线信息搜寻意愿产生显著正向作用。搜寻渠道、搜寻场景、受教育程度、身份类别和社会文化会对上述8个变量与在线信息搜寻意愿之间的关系产生调节。     

网络舆情研究进展及其主题关联关系路径分析

［目的/意义］ 梳理网络舆情的研究进展,有助于厘清网络舆情研究的知识基础、传导规律、预警机制和治理策略等之间的内在联系和主题演化路径。［方法/过程］ 首先分析网络舆情的理论知识基础,然后结合现有研究,按照内容递进的规律将网络舆情研究分为影响因素、传导路径、预警机制以及引导治理策略四个主题,采用内容分析法和社会网络分析法对网络舆情进行主题关联关系分析和演化路径探索。［结果/结论］ 结果表明,生命周期理论、认知定势理论、沉默的螺旋、群体极化理论、蝴蝶效应理论和治理理论常作为网络舆情研究的理论知识基础,网络媒介环境、社会结构压力、网民心理、触发性事件、有效动员和社会控制力量六个因素被视为网络舆情演化的重要影响要素,且网络舆情、舆情事件、社交媒体、利益相关者、大数据和信息传播等六个主题与其他研究内容关系较为密切,在主题演化路径中发挥着重要桥接作用。     

新《档案法》实施背景下档案文创产品价值共创策略探析

作为档案资源开发利用工作的重要内容,如何创造并实现档案文创产品的价值,日益成为档案领域的一项重要课题.文章结合新《档案法》,从价值共创主体的视角出发研究了档案文创产品的开发利用.档案人员应推动档案科技在文创产品上的应用与转化,组建专业化的文创团队;档案服务企业应积极提供特色服务与创意方案,为文创产品的数字化开发提供技术支持;社会公众应积极参与文创产品的开发与推广活动,主动地进行需求表达与意见反馈.     

《史》《汉》“廉武”析疑

汉武帝时期,酷吏张汤屡次称赞尹齐"廉武",此即《史记》所载尹齐"事张汤,张汤数称以为廉武"。但是,今本《汉书》却记载为尹齐"事张汤,汤数称以为廉。武帝使督盗贼"云云。当以《史》文为是。今本《汉书》衍"帝"字,"武"字当上属"廉"字为句。楚人多谓"士"曰"武",张汤以尹齐为"廉武","廉武"即"廉士"。《汉书》至迟在南宋时就已衍入"帝"字,世人多不知此,又不明"廉武"词义,故在引述之时多存误说。     

Use and evaluation of information from social media: A longitudinal cohort study

This cohort study examined longitudinal changes in undergraduates' use of social media as information sources in academic and everyday-life contexts, covering types of social media used, purposes of use, and evaluation strategies. Web surveys were used, collecting data from 1,355 and 928 undergraduates in 2013 and 2019. The study found that students used most types of social media less in 2019 than 2013 in both contexts. Only media-sharing services bucked this downward pattern. Overall, a majority of social media types underwent changes in the top three purposes of use. The 2019 cohort used most evaluation strategies more frequently in both contexts. However, they favored simplistic strategies relying on superficial physical cues when evaluating information. Based on the findings, this study provided recommendations for information literacy education and interface design, such as covering multimedia information evaluation, leveraging various heuristics to prime careful use of social media and analytical evaluation of information.     

论唐末五代时期西蜀社会的崇佛思潮

唐末五代时期,西蜀佛教受到统治者大力支持和当地民众的热情拥护,蜀地禅宗和密宗两派均获得了长足发展。西蜀社会各阶层有着强烈的崇佛热情,他们的奉佛信念和佞佛行为表现在建造佛寺、刻立寺碑、镌造佛像各个方面。