Human capital heterogeneity, collaborative relationships, and publication patterns in a multidisciplinary scientific alliance: a comparative case study of two scientific teams     

Joseph F Porac  Harald M Fischer  Joyce Brown  Geoffrey Bowker 《Research Policy》2004,33(4):661-678

In this paper, we compare the publication outcomes of two teams within a multi-university scientific alliance. Scientists in one team share similar scholarly backgrounds and work in a well established paradigm, while scientists in the second team have different backgrounds and work in an emergent discipline. While the alliance has increased the productivity of both teams, this increase was highest for the more heterogeneous team. In addition, while the variety of knowledge concepts employed in their research was initially higher for the heterogeneous team, this gap narrowed over time. We discuss the implications of our research for alliance design.  相似文献   

The laboratory test utilization management toolbox     

Geoffrey Baird 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2014,24(2):223-234

Efficiently managing laboratory test utilization requires both ensuring adequate utilization of needed tests in some patients and discouraging superfluous tests in other patients. After the difficult clinical decision is made to define the patients that do and do not need a test, a wealth of interventions are available to the clinician and laboratorian to help guide appropriate utilization. These interventions are collectively referred to here as the utilization management toolbox. Experience has shown that some tools in the toolbox are weak and other are strong, and that tools are most effective when many are used simultaneously. While the outcomes of utilization management studies are not always as concrete as may be desired, what data is available in the literature indicate that strong utilization management interventions are safe and effective measures to improve patient health and reduce waste in an era of increasing financial pressure.  相似文献   

A psychometric evaluation of the digital logic concept inventory     

Geoffrey L. Herman  Craig Zilles  Michael C. Loui 《Computer Science Education》2014,24(4):277-303

Concept inventories hold tremendous promise for promoting the rigorous evaluation of teaching methods that might remedy common student misconceptions and promote deep learning. The measurements from concept inventories can be trusted only if the concept inventories are evaluated both by expert feedback and statistical scrutiny (psychometric evaluation). Classical Test Theory and Item Response Theory provide two psychometric frameworks for evaluating the quality of assessment tools. We discuss how these theories can be applied to assessment tools generally and then apply them to the Digital Logic Concept Inventory (DLCI). We demonstrate that the DLCI is sufficiently reliable for research purposes when used in its entirety and as a post-course assessment of students’ conceptual understanding of digital logic. The DLCI can also discriminate between students across a wide range of ability levels, providing the most information about weaker students’ ability levels.  相似文献   

Residual force enhancement due to active muscle lengthening allows similar reductions in neuromuscular activation during position- and force-control tasks     

Rhiannon Marion  Geoffrey A. Power 《运动与健康科学(英文)》2020,9(6):670-676

BackgroundResidual torque enhancement (rTE) is the increase in torque observed during the isometric steady state following active muscle lengthening when compared with a fixed-end isometric contraction at the same muscle length and level of neuromuscular activation. In the rTE state, owing to an elevated contribution of passive force to total force production, less active force is required, and there is a subsequent reduction in activation. In vivo studies of rTE reporting an activation reduction are often performed using a dynamometer, where participants contract against a rigid restraint, resisting a torque motor. rTE has yet to be investigated during a position task, which involves the displacement of an inertial load with positional control.MethodsA total of 12 participants (6 males, 6 females; age = 22.8 ± 1.1 years, height = 174.7 ± 8.6 cm, mass = 82.1 ± 37.7 kg; mean ± SD) completed torque- and position-matching tasks at 60% maximum voluntary contraction for a fixed-end isometric contraction and an isometric contraction following active lengthening of the ankle dorsiflexors.ResultsThere were no significant differences in activation between torque- and position-matching tasks (p = 0.743), with ∼27% activation reduction following active lengthening for both task types (p < 0.001).ConclusionThese results indicate that rTE is a feature of voluntary, position-controlled contractions. These findings support and extend previous findings of isometric torque-control conditions to position-controlled contractions that represent different tasks of daily living.  相似文献   

The Critical Role of Stereopsis in Virtual and Mixed Reality Learning Environments     

Bruce Wainman  Giancarlo Pukas  Liliana Wolak  Sylvia Mohanraj  Jason Lamb  Geoffrey R. Norman 《Anatomical sciences education》2020,13(3):401-412

Anatomy education has been revolutionized through digital media, resulting in major advances in realism, portability, scalability, and user satisfaction. However, while such approaches may well be more portable, realistic, or satisfying than traditional photographic presentations, it is less clear that they have any superiority in terms of student learning. In this study, it was hypothesized that virtual and mixed reality presentations of pelvic anatomy will have an advantage over two-dimensional (2D) presentations and perform approximately equal to physical models and that this advantage over 2D presentations will be reduced when stereopsis is decreased by covering the non-dominant eye. Groups of 20 undergraduate students learned pelvic anatomy under seven conditions: physical model with and without stereo vision, mixed reality with and without stereo vision, virtual reality with and without stereo vision, and key views on a computer monitor. All were tested with a cadaveric pelvis and a 15-item, short-answer recognition test. Compared to the key views, the physical model had a 70% increase in accuracy in structure identification; the virtual reality a 25% increase, and the mixed reality a non-significant 2.5% change. Blocking stereopsis reduced performance on the physical model by 15%, on virtual reality by 60%, but by only 2.5% on the mixed reality technology. The data show that virtual and mixed reality technologies tested are inferior to physical models and that true stereopsis is critical in learning anatomy.  相似文献   

Cultural mapping as cultural inquiry     

Geoffrey Crossick 《Cultural Trends》2016,25(4):305-306

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Stewart,O’Reilly,and The Rumble 2012: Alternative Political Debate in the Age of Hybridity     

Geoffrey Baym 《Popular Communication》2014,12(2):75-88

This study explores the internet-only political debate held in the run-up to the 2012 U.S. presidential election between political-entertainment personalities Jon Stewart and Bill O’Reilly. Independently produced and financed through a version of crowd-funding, the debate offers a window into the fundamentally hybrid nature of contemporary mediated political discourse. A novel form of hybrid celebrity politics afforded by emergent technological, economic, and cultural forces, the so-called “Rumble in the Air Conditioned Auditorium” interwove televisual celebrity, political advocacy, affective spectacle, and deliberative exchange. In so doing, it spoke to the increasingly complicated nature of representation, authenticity, and the possibilities of political speech in a hybrid media age.  相似文献   

Frequency and attendance at popular music concerts in the USA: Does facility age matter?     

Geoffrey Propheter 《Cultural Trends》2015,24(4):310-319

Popular music is a valuable community amenity in the USA. State and local governments often encourage concert development by subsidizing construction and operation of concert venues. The facilities most likely to receive public support also host professional sports franchises. Public policy arguments supporting subsidization often maintain that concert frequency declines as facilities age, thus necessitating their replacement. Anecdotal evidence is inconsistent on the matter. Using a two-year pooled cross-section of 1234 concerts in 80 professional sports facilities from July 2012 to June 2014, the present study tests if facility age predicts changes in concert frequency and attendance. The results lend support to subsidy proponents' arguments, but the magnitude of the age effects is unlikely to warrant significant subsidy levels.  相似文献   

Environmental inequality and disparities in school readiness: The role of neurotoxic lead     

Jared N. Schachner  Geoffrey T. Wodtke 《Child development》2023,94(6):e308-e327

Developmental science has increasingly scrutinized how environmental hazards influence child outcomes, but few studies examine how contaminants affect disparities in early skill formation. Linking research on environmental inequality and early childhood development, this study assessed whether differences in exposure to neurotoxic lead explain sociodemographic gaps in school readiness. Using panel data tracking a representative sample of 1266 Chicago children (50% female, 16% White, 30% Black, 49% Hispanic, μ_age = 5.2 months at baseline, collected 1994–2002), analyses quantified the contribution of lead contamination to class and racial disparities in vocabulary skills and attention problems at ages 4 and 5. Results suggested that lead contamination explains 15%–25% and 33%–66% of the disparities in each outcome, respectively, although imprecise estimates preclude drawing firm inferences about attention problems.  相似文献   

Transforming education through ICT: Exploring students' study practices in a resource-constrained university setting     

Lone Dirckinck-Holmfeld  Ann Bygholm  Geoffrey Olok Tabo 《British journal of educational technology : journal of the Council for Educational Technology》2023,54(6):1463-1483

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