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排序方式: 共有102条查询结果,搜索用时 31 毫秒
51.
This study explores the channels through which technological investments affect productivity performance of industrialized economies. Using a Stochastic Frontier Model (SFM) we estimate the productivity effects of R&D and ICT for a large sample of OECD industries between 1973 and 2007, identifying four channels of transmission: input accumulation, technological change, technical efficiency and spillovers. Our results show that ICT has been particularly effective in reducing production inefficiency and in generating inter-industry spillovers, while R&D has raised the rate of technical change and favoured knowledge spillovers within sectors. We also quantify the contribution of technological investments to output and total factor productivity growth documenting that R&D and ICT accounted for almost 95% of productivity growth in the OECD area. 相似文献
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53.
The main objective of this study is to estimate the association between financial aid and college dropout rates of postsecondary
students in Colombia. We use a unique dataset from the Colombian Ministry of Education that includes all enrolled college
students in the country between 1998 and 2008. Logistic regression is used to identify the correlation between receiving different
forms of financial aid on the dropout rates of the students. The main results of the study suggest that the probability of
dropping out decrease between 25 and 29% according to the type of financial aid received. There is also evidence that the
financial aid is more effective in reducing dropout rates at the beginning of the student’s college careers. This result holds
after controlling by type of postsecondary institution attended. These findings suggest that financial aid is an effective
tool to reduce dropout rates, and therefore increase persistence and expand access in Colombia. 相似文献
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55.
Fato Adilolu Fabio Fragiacomo Fabiano Petricone 《The International Journal of Art & Design Education》2021,40(1):268-282
This article reflects on six years of research activities in the field of long‐distance collaboration and more specifically on how creative virtual teams operate and respond to challenges set by emerging and developing technologies. Furthermore, it considers how to build, manage and shape a more inclusive virtual team, documenting the methodologies applied in each activity, the experiences of both tutors and students and the educational context in which the international study took place. The project set out with a methodology for observing, managing and developing the interaction dynamics between each creative team member involved in the design of activities and practice of delocalized teams. The project is positioned within the field of educational technology and identifies a set of operative recommendations aimed at educators so that remote creative collaborative work can result most effective. The article explores the potential of virtual teams supporting communication and design. 相似文献
56.
Robbie S Wilson Nicholas M A Smith Solange de Paula Ramos Fabio Giuliano Caetano Marcio Aparecido Rinaldo Paulo Roberto Pereira Santiago 《Journal of sports sciences》2019,37(9):1072-1079
This study assessed whether a new, closed-skill dribbling or sprinting task could predict attacking performance in soccer. Twenty-five male players were recruited from the Londrina Junior Team Football Academy in Brazil and asked to either dribble the ball or sprint through five custom circuits that varied in average curvature (0–1.37 radians.m?1). These measures were then validated using a realistic one vs. one competition in which each player acted as attacker or defender in turn (N = 1330 bouts). Sprinting (ICC = 0.96) and dribbling (ICC = 0.97) performances were highly repeatable for individual players. Average dribbling speed decreased non-linearly with increasing circuit curvature (F = 239.5; P < 0.001) from 5.19 ± 0.11 ms?1 on the straightest path to 2.13 ± 0.03 ms?1 on the curviest. Overall, dribbling but not sprinting performance predicted attacking success in the one vs. one competition, explaining more than 50% of the variation in attacking success alone (rp = 0.70; P < 0.001). In conclusion, our new closed-skill dribbling assessment is a valid and reliable protocol to predict a soccer player’s success in attacking performance in one vs. one situation, and can be used to identify talented players. 相似文献
57.
Alessandro M. Zagatto Fabio Y. Nakamura Fabio Milioni Willian E. Miyagi Rodrigo A. B. de Poli Johnny Padulo 《Journal of sports sciences》2017,35(24):2453-2460
The purpose of the study was to investigate the sensitivity of an alternative maximal accumulated oxygen deficit (MAODALT) method to discriminate the “anaerobic” capacity while comparing: least trained (LT) participants (n = 12), moderately trained (MT) participants (n = 12), endurance trained (ET) participants (n = 16), and rugby (RG) players (n = 11). Participants underwent a graded exercise test on a treadmill and a supramaximal effort for assessing MAODALT. MAODALT was calculated as the sum of oxygen equivalents from the phosphagen and glycolytic metabolic pathways. MAODALT was significantly higher (P < 0.05) in RG (64.4 ± 12.1 mL · kg?1) than in ET (56.8 ± 5.4 mL · kg?1; effect size [ES] = 0.77; +13.5%), MT (53.8 ± 5.3 mL · kg?1; ES = 1.08; +19.8%), and LT (49.9 ± 4.5 mL · kg?1; ES = 1.50; +36.4%). In addition, the magnitude-based inference analysis revealed that MAODALT was likely (LT vs. MT), very likely (MT vs. RG, and ET vs. RG) and most likely (LT vs. ET, and LT vs. RG) different between all groups, except for MT and ET, which presented an unclear difference. In conclusion, MAODALT was sensitive enough to distinguish the “anaerobic” capacity in individuals with different training status, especially for RG players compared with LT participants and MT participants. 相似文献
58.
Education for Integrated Rural Development: transformative learning in a complex and uncertain world
Arjen E.J. Wals Fabio Caporali Paul Pace Bill Slee Nadarajah Sriskandarajah Martyn Warren 《The Journal of Agricultural Education and Extension》2013,19(2):89-100
A key question addressed in this article is: How does the increased pressure for expertise in IRD translate itself into the demand for educational services and the design of appropriate curricula on a European-wide basis? This article examines these issues and generates a number of stepping stones for the development of Education and Training for Integrated Rural Development (ETIRD) in tertiary education, based on a two-year inter-institutional curriculum development project carried out under the umbrella of the AFANeti. 相似文献
59.
Fabio Galbusera Davide Zai Tornese Federica Anasetti Simone Bersini Piero Volpi Luigi La Barbera 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):293-301
Non-contact injuries in soccer players may be related to the interplay between cleat type and playing surface, and bladed shoes were often blamed for non-contact injuries with no research support. The aim of this study was to compare the rotational resistance (stiffness and peak sustainable torque) among three types of soccer cleats (metal studs, molded rubber studs, and bladed) in a controlled laboratory environment. The shoes were tested on both natural and artificial turfs under a compressive preload of 1000 N and with internal and external rotations. The three shoe models showed comparable performances with a good repeatability for each individual test on both playing surfaces. A less stiff behavior was observed for the natural turf. A tendency toward highest peak torque was observed in the studded model on natural surface. The bladed cleats provided peak torque and rotational stiffness comparable to the other models. Studded and bladed cleats did not significantly differ in their interaction with the playing surface. Therefore, soccer shoes with bladed cleats should not be banned in the context of presumed higher risk for non-contact injuries. 相似文献
60.
Multispectral imaging techniques are widely used to analyse and restore digital images of ancient documents degraded over time. In particular, acquisitions in infrared and ultraviolet bands can reveal information invisible by naked eye, which is not captured by conventional RGB imaging. Multispectral acquisitions are usually performed with filter-wheel cameras that mount a series of interference filters in front of the sensor to select the spectral band in which the document has to be acquired. Due to the use of different filters, the focus of the lens changes and it is necessary to adjust it manually for each filter, because such imaging systems are devoid of automatic focusing. Thus the acquired images may not be perfectly in-focus and have misalignments. In this work we present an automatic solution to acquire a multispectral data cube of aligned images that can be used in document analysis to extract and/or separate information through enhancement techniques. A custom-made motorized autofocus system controlled by software has been installed on a filter-wheel camera, which allows us to acquire in-focus images automatically at each filter changing, and a registration method based on Fourier-Mellin transform aligns these images. A preliminary calibration is performed to set the focusing of each filter with the working distance. As a result, the camera can capture images independently from the contrast of the scene, also in presence of documents with homogeneous texture. The proposed solution reduces considerably the acquisition time and offers a tool to acquire automatically the data cube to be used in further image analysis techniques. The results of experimentations are hereby presented and discussed. 相似文献