No evidence of seed transmissibility of <Emphasis Type="Italic">Tomato yellow leaf curl virus</Emphasis> in <Emphasis Type="Italic">Nicotiana benthamiana</Emphasis>     

Tábata Rosas-Díaz  Dan Zhang  Rosa Lozano-Durán 《Journal of Zhejiang University. Science. B》2017,18(5):437-440

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The influence of flow on learning outcomes: An empirical study on the use of clickers     

Isabel Buil  Sara Catalán  Eva Martínez 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(1):428-439

Flow is a state of total absorption and concentration in an activity that is desirable for students, as it enhances the learning experience. Due to the importance of flow for learning, this research investigates the influence of three flow preconditions—namely balance of skill and challenge, feedback and goal clarity—on students' flow, operationalized as heightened concentration, sense of control and autotelic experience, while using clickers—a type of polling device. The study also explores the impact of concentration, sense of control and autotelic experience on students' perceived learning and satisfaction. Based on a survey of 204 undergraduate students who use clickers in the classroom, the findings show that balance of skill and challenge has a positive influence on students' concentration, sense of control and autotelic experience. Both feedback provided by clickers and goal clarity have a positive influence on concentration and sense of control, but do not influence the autotelic experience. Findings also corroborate the positive impact of concentration and sense of control experienced by students on perceived learning. Finally, autotelic experience predicts both perceived learning and satisfaction.  相似文献   

A Family Focused Intervention Influences Hippocampal-Prefrontal Connectivity Through Gains in Self-Regulation     

Jamie L. Hanson  Alysha D. Gillmore  Tianyi Yu  Christopher J. Holmes  Emily S. Hallowell  Allen W. Barton  Steven R.H. Beach  Adrianna Galván  James MacKillop  Michael Windle  Edith Chen  Gregory E. Miller  Lawrence H. Sweet  Gene H. Brody 《Child development》2019,90(4):1389-1401

The stressors associated with poverty increase the risks for externalizing psychopathology; however, specific patterns of neurobiology and higher self-regulation may buffer against these effects. This study leveraged a randomized control trial, aimed at increasing self-regulation at ~11 years of age. As adults, these same individuals completed functional MRI scanning (M_age = 24.88 years; intervention n = 44; control n = 49). Functional connectivity between the hippocampus and ventromedial prefrontal cortex was examined in relation to the intervention, gains in self-regulation, and present-day externalizing symptoms. Increased connectivity between these brain areas was noted in the intervention group compared to controls. Furthermore, individual gains in self-regulation, instilled by the intervention, statistically explained this brain difference. These results begin to connect neurobiological and psychosocial markers of risk and resiliency.  相似文献   

The impact of formative and shared or co-assessment on the acquisition of transversal competences in higher education     

David Hortigüela Alcalá  Andrés Palacios Picos  Víctor López Pastor 《Assessment & Evaluation in Higher Education》2019,44(6):933-945

The use of formative and shared or co-assessment has been shown to improve the motivation, involvement and learning of university students. The aim of this study is to analyse the effect that implementing these processes has on university students’ perception of their acquisition of transversal competences. The participants in the study were 1021 students from five Spanish universities taking degree courses in primary education or physical education and sport science. They all experienced formative and shared or co-assessment throughout a complete academic year of their courses. For the data collection, a Self-Perception Scale of Transversal Competences was created, which had adequate values of reliability and validity. Using a transversal design (inter-subjects), inferential statistical analysis was undertaken of the differences in means between the perception of a range of transversal competences before and after the course. The results show significant perceived improvements at the end of the course for most of the competences analysed, which indicates, among other thing, the value and importance of this type of assessment for the educational process.  相似文献   

Dynamic profiles using sentiment analysis and twitter data for voting advice applications     

Luis Terán  José Mancera 《Government Information Quarterly》2019,36(3):520-535

Nowadays, political campaigns combine traditional media channels with social media platforms, opening new and promising possibilities for parties and candidates looking for better political strategies and visibility. Voting advice applications (VAAs) recommend parties and candidates that are close to a citizen's political preferences and require the constrution of candidate and party profiles. Profile generation is an essential task in the development of VAAs and requires two steps: an unbiased design of political questionnaires and the collection of all candidates' answers. This paper presents an extension of a VAA, implemented in within the project Participa Inteligente (PI), a social-network platform designed for the 2017 Ecuadorian national elections. This work concentrates on the implementation of dynamic candidate profiling using Twitter data and sentiment analysis as an additional element to the static profile generation of VAAs. The implementation of a dynamic element for VAAs could help mitigate the effect of biased recommendations given during the construction of candidate and party profiles. At the end of this work, the dynamic profile is compared with the classic static elements developed within the PI project. The results show the level of similarities and differences between each of the elements in profile generation. This work provides an ideal basis for future research in the area of VAAs and their interfaces. Additionally, it opens up a broader spectrum of applications for policymakers including decision-making and collaborative working environments toward e-empowerment.  相似文献   

Twitter as a tool for citizen engagement: An empirical study of the Andalusian municipalities     

Enrique Bonsón  David Perea  Michaela Bednárová 《Government Information Quarterly》2019,36(3):480-489

This paper provides a general overview of the way local governments use Twitter as a communication tool to engage with their citizens. More concretely, it tries to identify factors associated with both the channel activity and citizen engagement, to understand the relationship between media type and citizen engagement and to analyse whether different content generated different levels of engagement. A sample of the 29 most populated Andalusian local governments is examined. The results show that the majority of Andalusian local governments have an official corporate Twitter account with certain level of activity. There is no, however, a significant relationship between the population of a municipality and its citizen's engagement, and there is a significant negative relationship between audience and engagement and between activity and engagement. The findings of the study also show the particular media and content types generate higher engagement than others. This paper contributes to the literature on social media and has practical implications for local governments.  相似文献   

地方政府在城市商业性房屋拆迁中的角色分析     

金玉  史贤华 《滁州学院学报》2011,(6):21-23,38

城市商业性房屋拆迁是一个敏感而又被社会普遍关注的话题。地方政府、拆迁人、被拆迁人在城市商业性房屋拆迁中,为了各自的利益表现各有不同,导致诸多影响社会稳定的事件发生。我国城市商业性房屋拆迁出现问题的关键是地方政府角色混乱,行政权违法或不当行使。为规范城市商业性房屋拆迁,法律、法规应严格区分公益性拆迁和商业性拆迁,通过制定城市房屋拆迁法律程序来规范地方政府的行为,控制地方政府行政权的行使。如果地方政府在城市商业性房屋拆迁中能正确履行职责,本着问政于民,让利于民,切实从人民利益出发,会发现拆迁本来可以很和谐。  相似文献   

原子与耦合腔相互作用系统中原子布居数的演化     

吴亚女 《Journal of Zhangzhou Technical Institute》2011,13(2):66-70

研究两个二能级原子分别与耦合腔A和B相互作用系统中原子布居差随时间演化规律。讨论腔场间的耦合强度变化对原子布居差演化的影响。研究结果表明:随腔场间耦合强度的增强,原子布居差随时间演化的行为经历从不规则振荡到呈现周期性振荡的过程。当腔场间耦合强度较弱时,原子布居差随时间演化呈现崩塌和恢复效应。当腔场间耦合强度较强时,原子布居差呈现周期性演化规律。  相似文献   

MHq indicators for zero-inflated count data—A response to the comment by Smolinsky (in press)     

Lutz Bornmann  Robin Haunschild  Rüdiger Mutz 《Journal of Informetrics》2019,13(1):464-465

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How to consider fractional counting and field normalization in the statistical modeling of bibliometric data: A multilevel Poisson regression approach     

Rüdiger Mutz  Hans-Dieter Daniel 《Journal of Informetrics》2019,13(2):643-657

The numerical-algorithmic procedures of fractional counting and field normalization are often mentioned as indispensable requirements for bibliometric analyses. Against the background of the increasing importance of statistics in bibliometrics, a multilevel Poisson regression model (level 1: publication, level 2: author) shows possible ways to consider fractional counting and field normalization in a statistical model (fractional counting I). However, due to the assumption of duplicate publications in the data set, the approach is not quite optimal. Therefore, a more advanced approach, a multilevel multiple membership model, is proposed that no longer provides for duplicates (fractional counting II). It is assumed that the citation impact can essentially be attributed to time-stable dispositions of researchers as authors who contribute with different fractions to the success of a publication’s citation. The two approaches are applied to bibliometric data for 254 scientists working in social science methodology. A major advantage of fractional counting II is that the results no longer depend on the type of fractional counting (e.g., equal weighting). Differences between authors in rankings are reproduced more clearly than on the basis of percentiles. In addition, the strong importance of field normalization is demonstrated; 60% of the citation variance is explained by field normalization.  相似文献