Comparing Theories of Media Learning: Cognitive Mediation,Information Utility,and Knowledge Acquisition from Cancer News     

Andy J. King  Jakob D. Jensen  Nick Carcioppolo  Melinda M. Krakow  Ye Sun 《Mass Communication and Society》2013,16(6):753-775

Determining what factors predict media learning is an important avenue of research for the field of mass communication. The present study provides a comparative investigation of two models of media learning: the cognitive mediation model and the information utility model. Participants (N = 1,076) read a news article related to scientific discoveries relevant to cancer prevention and responded to all constructs of the two models. Recognition and comprehension were used to measure knowledge acquisition. Results generally support previous predictions of each model, though predicted variance remains small. In addition to testing the existing models, a modified cognitive mediation model using a key construct related to information utility—perceived relevance—was tested. The refined cognitive mediation model offered a more nuanced understanding of certain causal mechanisms but did not result in a meaningful change in predictive power of the model. Implications of the theoretical comparison and integration are discussed.  相似文献   

Feminists of faith: Sonia Johnson and the Mormons for ERA     

Richard J. Jensen  John C. Hammerback 《Communication Studies》2013,64(3):123-137

The Mormons for ERA is analyzed in this essay as an innovational movement. In this way, Sonia Johnson's appeals to mainstream Mormons before her excommunication can he understood as reformist discourse which became radicalized only in a second stage.  相似文献   

The critical sense: Three decades of critical media studies in the wake of Samuel L. Becker's “rhetorical studies for the contemporary world”     

Leah R. Vande Berg 《Communication Studies》2013,64(1):72-81

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Collaborative Approaches to Resolving Difficult ILL Borrowing Requests: Using a Working Group and a Wiki for Knowledge Sharing     

Dana Von Berg 《Journal of Interlibrary Loan, Document Delivery & Electronic Reserve》2013,23(5):337-345

Interlibrary loan borrowing staff at the University of Arizona Main Library, who handle difficult interlibrary loan requests, are taking a collaborative approach to obtaining unique, difficult-to-locate materials. A working group within the document delivery team meets weekly to share examples processed during the preceding week to increase the fill rate of challenging interlibrary loan requests. The group also established a wiki for the purpose of sharing resources that have been used to solve difficult requests. The wiki serves as an advanced interlibrary loan training resource that can be accessed by a greater number of staff, enabling them to gain the skills necessary to process difficult requests.  相似文献   

Determining The Presence of Photocatalytic Titanium White Pigments via Embedded Paint Sample Staining: A Proof of Principle     

Birgit Anne van Driel  Sharon R. van der Meer  Klaas Jan van den Berg  Joris Dik 《文物保护研究》2013,58(5):261-272

ABSTRACT

Twentieth century paints often contain titanium dioxide and zinc oxide based white pigments that can range from photostable to highly photocatalytic. Photocatalytic pigments can cause the degradation of paint upon UV exposure, whereas photostable pigments may be benign or can protect paintings from degradation. Hence, knowing whether or not a pigment is photocatalytic is of high importance for risk assessment and the subsequent decision making process concerning storage and exposure conditions of objects. Here we present a proof of principle, focused on titanium white paints, for an easy-to-use and low-tech application of a commercial photocatalytic activity indicator ink (PAII) on embedded paint samples or cross sections. This test determines, qualitatively, if a photocatalytic pigment is present in a white paint sample. The PAII paint sample staining application shows an obvious color change, within five minutes of UV irradiation, for paint samples containing photocatalytic pigments. A microscope with a camera and a UV source are the only necessary equipment for the application of this method. A quantitative image processing protocol is also proposed as an extension of the staining method by applying open source software analysis to measure the color change using photographs. The test was evaluated on reference paints with well-characterized pigments and applied on samples from modern paintings by Piet Mondriaan, Robert Ryman, and Lucebert, indicating the presence of harmful photocatalytic pigments in these cases. The novel application of a commercial ink on paint samples offers a simple test, not just for assessment of photocatalytic activity of titanium white pigments, but which may in future be applied for the detection of photoactive forms of zinc white and other potentially harmful semiconductor pigments in art objects.  相似文献   

Index for Volume 55 (1984)     

Kris Berg  Richard W. Latin  Thomas Baechle 《Research quarterly for exercise and sport》2013,84(4):395-401

Abstract

This study investigated the timing of the trigger pull in relation to the cardiac cycle during air rifle shooting. Electrocardiogram) was recorded from 20 male nonelite rifle shooters in two separate testing sessions. The testing was conducted at an indoor shooting range using an optoelectronic shooting system. Each participant fired a shot in the standing position at a distance of 10 m from the target. The results showed that compared to random triggering, the shooters fired more often during the phase of 10–50% of the R wave-to-R wave (R-R) interval and less often during the phase of 50–90%. With regard to performance accuracy, the participants exhibited average or above average performance, when the shot occurred in the beginning (0–50%) and in the end (70–99%) of the R-R interval. The less optimal range for the triggering was located within the 50–70% phase of the R-R interval. The length of R-R interval (i.e., heart rate) did not affect the relation of shot placement within the cardiac cycle to the accuracy of shooting performance. The present results extend previous findings by showing that in air rifle shooting the optimum firing time within the cardiac cycle may be located in the systolic phase. It is argued that the systole-diastole dichotomy is not a sufficiently accurate way to investigate the effects of shot placement in the cardiac cycle. Further research is needed to examine the extent to which the relationship between the timing of triggering within the cardiac cycle and shooting performance depends a shooter's skill level.  相似文献   

Feasibility of eyes open alpha power training for mental enhancement in elite gymnasts     

Marian K. J. Dekker  Berber R. Van den Berg  Ad J. M. Denissen  Margriet M. Sitskoorn 《Journal of sports sciences》2013,31(16):1550-1560

Abstract

This study focuses on a novel, easy to use and instruction-less method for mental training in athletes. Previous findings suggest that particular mental capacities are needed for achieving peak performance; including attentional control, focus, relaxation and positive affect. Electroencephalography (EEG) alpha brain activity has been associated with neural inhibition during processes of selective attention, for improving efficiency in information processing. Here we hypothesised that eyes open alpha power training by music teaches athletes to (1) learn to self-regulate their brain activity, and (2) learn to increase their baseline alpha power, herewith improving mental capacities such as focusing the allocation of attention. The study was double-blind and placebo-controlled. Twelve elite gymnasts were either given eyes open alpha power training or random beta power training (controls). Results indicate small improvements in sleep quality, mental and physical shape. In our first attempt at getting a grip on mental capacities in athletes, we think this novel training method can be promising. Because gymnastics is one of the most mentally demanding sports, we value even small benefits for the athlete and consider them indicative for future research.  相似文献   

Body Impedance Analysis and Body Water Loss     

Lonn Hutcheson  Lonn Hutcheson  Kris E. Berg  Earnest Prentice 《Research quarterly for exercise and sport》2013,84(4):359-362

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Sympathoadrenal and parasympathetic responses to exercise     

Niels Holmqvist  Niels H. Secher  Kåre Sander‐Jensen  Ulrich Knigge  J⊘rgen Warberg  Thue W. Schwartz 《Journal of sports sciences》2013,31(2):123-128

Exhaustive exercise is associated with a persistent sensation of weakness and sometimes nausea suggesting abdominal vagal activity. We measured plasma indices of sympathoadrenal (adrenaline, noradrenaline, dopamine) and vagal (pancreatic polypeptide) activity before, during and after submaximal and maximal exercise in healthy young subjects. Plasma adrenaline, noradrenaline and dopamine increased to 8.5 (range 7.4–40.5), 48.0 (32.3–100.5) and 1.8 (1.2–6.6) nmol l^–1 respectively (n = 5), during maximal exercise and decreased towards control values within 15 min of rest. Pancreatic polypeptide (n = 10) increased only during maximal exercise and reached its highest value, 48 (21–145) pmol l^–1, after exertion. The results conform to an increase in sympathetic activity during exercise and a persistent vagal activity after intense exercise which could contribute to the sensation of weakness.  相似文献   

Enhanced learning through design problems – teaching a components-based course through design     

Bogi Bech Jensen  Stig Högberg  Frida av Fløtum Jensen  Nenad Mijatovic 《European Journal of Engineering Education》2012,37(4):375-382

This paper describes a teaching method used in an electrical machines course, where the students learn about electrical machines by designing them. The aim of the course is not to teach design, albeit this is a side product, but rather to teach the fundamentals and the function of electrical machines through design. The teaching method is evaluated by a student questionnaire, designed to measure the quality and effectiveness of the teaching method. The results of the questionnaire conclusively show that this method labelled ‘learning through design’ is a very effective way of teaching a components-based course. This teaching method can easily be generalised and used in other courses.  相似文献