Investigating the quality of interactions and public engagement around scientific papers on Twitter     

Fereshteh Didegah  Niels Mejlgaard  Mads P. Sørensen 《Journal of Informetrics》2018,12(3):960-971

This study explores science communication on Twitter by investigating a sample of tweets referring to academic papers in five different scientific fields. The specifications of science communicators on Twitter, the characteristics of those who initiate actions (by tweeting), the extent and quality of reactions (retweeting), individual and group interactions, and the distribution of tweets across types of engagement in the process of science communication (i.e., dissemination, consultation, and evaluation) were explored. A broad array of actors is involved in the communication of science on Twitter, with individual citizens and individual researchers playing an important role. In principle, this is promising for creating direct interaction, which can be difficult through more traditional mass media. The vast majority of communication activities regarding academic papers is undigested dissemination with almost no sign of debate, contestation, or collective reflection. Another general finding of this study is that bot accounts play a major role in the science communication landscape on Twitter.  相似文献   

<Emphasis Type="Italic">Minerva</Emphasis> and the Development of Science (Policy) Studies     

Niels C. Taubert 《Minerva》2012,50(3):261-275

This article analyzes the transformation of Minerva from an intellectual towards a scholarly journal by making use of bibliometric methods. The aim is to provide some empirical insights that help to understand what properties of the journal changed in the course of this transformation process. Minerva was one of the first journals that reflected on science and its role in society and science policy in particular. Analyzing the development of the journal sheds light on the emergence of science (policy) studies and on Minerva’s role as a forerunner in this field. In a first step, the methods will be described. The second section provides some empirical results of the publication output of Minerva and its relations to other journals in the field. The empirical findings are put into a broader perspective in the concluding third section.  相似文献   

Learning to teach in higher education: how to link theory and practice     

Paul van den Bos  Joyce Brouwer 《Teaching in Higher Education》2013,18(7):772-786

In this study the learning process of 12 Dutch novice university teachers was monitored during a five-month induction programme. The teachers were interviewed before and after the programme and were asked to fill in several email logbooks during the programme. A change process was identified, in which experiencing and experimentation played a central role. In particular, modelling by the teacher educator, the observation of video cases, reflection on these with peers and experiencing success in their own practice seemed to be important incentives that encouraged teachers to adopt and eventually implement new pedagogical approaches. On the basis of our data, we think that teachers' conceptions and teaching practice are best developed simultaneously and that the design of induction programmes should support this process.  相似文献   

Learning by starch potato growers: learning in small businesses with no employees     

Niels R. Faber  Laura Maruster  René J. Jorna  Rob J.F. van Haren 《Educational Research and Evaluation》2013,19(6):519-539

In small businesses with no employees, learning environments have a low learning readiness. Consequently, learners need to rely on their own agency to shape their learning experiences. Results from a study of agricultural entrepreneurs indicated that the components of motivation and self-regulated learning strategies shape learner's agency and explain learning environment configuration in small businesses with no employees. Configuration of the learning environment was found to be a weak determinant of the learning performance of these learners. However, results showed that prior performance of learners in small businesses with no employees dictates how their agency operates and what learning effect is achieved; higher prior performance results in higher learning effects. We conclude that mechanisms that underlie learning in traditional learning environments work similarly in learning environments in small businesses with no employees.  相似文献   

Recovery of pulmonary diffusing capacity after maximal exercise     

Jess Rasmussen  Birgitte Hanel  Kari Saunamaki  Niels H. Secher 《Journal of sports sciences》2013,31(6):525-531

Abstract

Pulmonary diffusing capacity (Dl_co), together with spirometric variables, arterial oxygen tension (paO₂) and cardiac output were determined before and at intervals after maximal arm cranking, treadmill running and erogmeter rowing. Independent of the type of exercise, Dl_co increased immediately post‐exercise from a median 13.6 (range 7.3–16.3) to 15.1 (9.3–19.6) mmol min^‐1 kPa^‐1 (P <0.01). However, it decreased to 11.6 (6.9–15.5) mmol min^‐1 kPa^‐1 (P <0.01) after 24 h with cardiac output and paO₂ at resting values, and Dl_co normalized after 20 h. Thoracic electrical impedance at 2.5 and 100 kHz increased slightly post‐exercise, indicating a decrease in thoracic fluid balance, and there were no echocardiographic signs of left ventricular failure at the time of the decrease in Dl_co. Also, active muscle (limb) circumference and volume, and an increase in haematocrit from 43.8 (38.0–47.0) to 47.1 (42.7–49.8) (P <0.01), had normalized at the time of the decrease in Dl_co. Vital capacity, forced vital capacity, forced expiratory volume in 1 s, peak and peak mid‐expiratory flows did not change. However, total lung capacity increased from 6.8 (5.0–7.6) to 7.0 (5.1–7.8) litres (P <0.05) immediately after exercise and remained elevated at 6.9 (5.1–8.7) litres (P <0.05) when a decrease in Dl_co was noted. The results demonstrate that independent of the type of maximal exercise, an approximate 15% reduction in Dl_co takes place 2–3 h post‐exercise, which normalizes during the following day of recovery.  相似文献   

Biomechanics of the ski cross start indoors on a customised training ramp and outdoors on snow     

Niels Jensby Nedergaard  Frederik Heinen  Simon Sloth  Hans-Christer Holmberg 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):273-286

An effective start enhances an athlete's chances of success in ski cross competitions. Accordingly, this study was designed to investigate the biomechanics of start techniques used by elite athletes and assess the influence of different start environments. Seven elite ski cross athletes performed starts indoors on a custom-built ramp; six of these also performed starts on an outdoor slope. Horizontal and vertical forces were measured by force transducers located in the handles of the start gate and a 12-camera motion capture system allowed monitoring of the sagittal knee, hip, shoulder, and elbow kinematics. The starting movement involved Pre, Pull, and Push phases. Significant differences between body sides were observed for peak vertical and resultant forces, resultant impulse, and peak angular velocity of the shoulder joint. Significantly lower peak vertical forces (44 N), higher resultant impulse (0.114 Ns/kg), and knee joint range of motion (12°) were observed indoors. Although movement in the ski cross start is generally symmetrical, asymmetric patterns of force were observed among the athletes. Two different movement strategies, i.e. pronounced hip extension or more accentuated elbow flexion, were utilised in the Pull phase. The patterns of force and movement during the indoor and outdoor starts were similar.  相似文献   

In/discernible bodies: the politics of passing in dominant and marginal media     

Catherine Squires  Daniel Brouwer 《Critical Studies in Media Communication》2013,30(3):283-310

This essay explores news media coverage of two types of alleged “passing”: passing across racial lines from Black to White and across sex lines from female to male. Textual analysis of dominant print media and print media discourses produced by and/or addressed to Blacks and queers reveals prominent frames through which news consumers are invited to perceive these events. In particular, the analysis demonstrates that both dominant and marginal social groups express the desire to fix the identities of passers in a single, discrete category, although these groups wish to do so for disparate reasons. In addition, marginal groups frame passing events within broad cultural and historical contexts in contrast to the narrow contexts framed by dominant media. Comparison of race and sex passing exposes the similarities–including community consternation about the passer–and differences–including disparate focus on civil rights rather than identity issues–between Black and queer coverage of these events. Comparison of race and sex passing also exposes the way in which dominant media correlate race passing with class passing, while sex passing is correlated to sexuality passing (that is, queer passing for heterosexual).  相似文献   

Counterpublicity and Corporeality in HIV/AIDS Zines     

Daniel C. Brouwer 《Critical Studies in Media Communication》2013,30(5):351-371

This essay demonstrates how two U.S. zines produced from 1990 to 1999 by and for gay men with HIV/AIDS—Diseased Pariah News (DPN) and Infected Faggot Perspectives (IFP)—constitute counterpublics. I demonstrate how DPN and IFP constitute counterpublics through thematization of two important forms of difference—blood status (HIV-positive or HIV-negative), and political ideology. I then specify and elaborate primary modes of corporeal expressivity in the zines—the erotic/sexual and the grotesque—to demonstrate the work that each mode does for the counterpublics.  相似文献   

Biology and atomic physics     

Niels Bohr 《Resonance》2013,18(10):948-960

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Mechanical Player Load™ using trunk-mounted accelerometry in football: Is it a reliable,task- and player-specific observation?     

Paulo Barreira  Mark A. Robinson  Barry Drust  Niels Nedergaard  Raja Mohammed Firhad Raja Azidin  Jos Vanrenterghem 《Journal of sports sciences》2017,35(17):1674-1681

The aim of the present study was to examine reliability and construct convergent validity of Player Load? (PL) from trunk-mounted accelerometry, expressed as a cumulative measure and an intensity measure (PL · min^–1). Fifteen male participants twice performed an overground football match simulation that included four different multidirectional football actions (jog, side cut, stride and sprint) whilst wearing a trunk-mounted accelerometer inbuilt in a global positioning system unit. Results showed a moderate-to-high reliability as indicated by the intra-class correlation coefficient (0.806–0.949) and limits of agreement. Convergent validity analysis showed considerable between-participant variation (coefficient of variation range 14.5–24.5%), which was not explained from participant demographics despite a negative association with body height for the stride task. Between-task variations generally showed a moderate correlation between ranking of participants for PL (0.593–0.764) and PL · min^–1 (0.282–0.736). It was concluded that monitoring PL^® in football multidirectional actions presents moderate-to-high reliability, that between-participant variability most likely relies on the individual’s locomotive skills and not their anthropometrics, and that the intensity of a task expressed by PL · min^–1 is largely related to the running velocity of the task.  相似文献