排序方式： 共有27条查询结果，搜索用时 215 毫秒
1.
Cristina Cadenas-Sánchez Raúl Arellano Sonia Taladriz Gracia López-Contreras 《Journal of sports sciences》2016,34(3):224-231
The aim of this study was to examine spatiotemporal characteristics and joint angles during forward and backward walking in water at low and high stride frequency. Eight healthy adults (22.1 ± 1.1 years) walked forward and backward underwater at low (50 pulses) and high frequency (80 pulses) at the xiphoid process level with arms crossed at the chest. The main differences observed were that the participants presented a greater speed (0.58 vs. 0.85 m/s) and more asymmetry of the step length (1.24 vs. 1.48) at high frequency whilst the stride and step length (0.84 vs. 0.7 m and 0.43 vs. 0.35 m, respectively) were lower compared to low frequency (P < 0.05). Support phase duration was higher at forward walking than backward walking (61.2 vs. 59.0%). At initial contact, we showed that during forward walking, the ankle and hip presented more flexion than during backward walking (ankle: 84.0 vs. 91.8º and hip: 22.8 vs. 8.0º; P < 0.001). At final stance, the knee and hip were more flexed at low frequency than at high frequency (knee: 150.0 vs. 157.0º and hip: ?12.2 vs. –14.5º; P < 0.001). The knee angle showed more flexion at forward walking (134.0º) than backward walking (173.1º) (P < 0.001). In conclusion, these results show how forward and backward walking in water at different frequencies differ and contribute to a better understanding of this activity in training and rehabilitation. 相似文献
2.
Rosaria Lumino Dora Gambardella Emiliano Grimaldi 《Journal of educational administration and history》2017,49(2):87-107
This article explores how new public management policy ideas and technologies circulating in the globalised education space have been re-contextualised in the re-design of the Italian Higher Education System. In doing so, it uses the governmentality studies as a sensitising framework to problematise what we term here as the ‘calculative and instrumental turn’ in the evaluation of Higher Education. The work reflects on the complex assemblage of forms of knowledge, technical means and collective and individual subjects through which the evaluation of the Italian universities unfolds in its current form. The attempt is to highlight the changes produced in how Higher Education and its ethical subjects are thought and their qualities are conceived and appraised. The article presents some conclusive remarks on some of the paradoxical risks of the Evaluation turn, namely contractualisation, depoliticisation and fabrication, but also insists on its reflexivity potential, interpreting the current developments as a missed opportunity. 相似文献
3.
Rupprecht P Golé L Rieu JP Vézy C Ferrigno R Mertani HC Rivière C 《Biomicrofluidics》2012,6(1):14107-1410712
We have developed a method for studying cellular adhesion by using a custom-designed microfluidic device with parallel non-connected tapered channels. The design enables investigation of cellular responses to a large range of shear stress (ratio of 25) with a single input flow-rate. For each shear stress, a large number of cells are analyzed (500–1500 cells), providing statistically relevant data within a single experiment. Besides adhesion strength measurements, the microsystem presented in this paper enables in-depth analysis of cell detachment kinetics by real-time videomicroscopy. It offers the possibility to analyze adhesion-associated processes, such as migration or cell shape change, within the same experiment. To show the versatility of our device, we examined quantitatively cell adhesion by analyzing kinetics, adhesive strength and migration behaviour or cell shape modifications of the unicellular model cell organism Dictyostelium discoideum at 21 °C and of the human breast cancer cell line MDA-MB-231 at 37 °C. For both cell types, we found that the threshold stresses, which are necessary to detach the cells, follow lognormal distributions, and that the detachment process follows first order kinetics. In addition, for particular conditions’ cells are found to exhibit similar adhesion threshold stresses, but very different detachment kinetics, revealing the importance of dynamics analysis to fully describe cell adhesion. With its rapid implementation and potential for parallel sample processing, such microsystem offers a highly controllable platform for exploring cell adhesion characteristics in a large set of environmental conditions and cell types, and could have wide applications across cell biology, tissue engineering, and cell screening. 相似文献
4.
5.
The literature on trolling has viewed trolling as discrete instances of transgression undertaken by antagonistic individuals. We identify three main issues with current theorizations: diffuse definitions of “trolling,” blurred boundaries between trolling and other online anti-social behaviors, and the context dependency of trolling. To address these unresolved issues, we adopt a practice-based theoretical approach. Informed by this approach, we analyze trolling behaviors not as products of individuals' attitudes, values, and decisions, but rather as behaviors embedded within and occurring as part of social practices. Specifically, we conduct a practice-based theoretical analysis in a multi-site exploratory study involving online archival research and in-depth interviews with online community members. Based on this analysis, we propose that trolling be conceived as a constellation of three social practices: learning, assimilating, and transgressing. Also, we find that practices of trolling transgression can have a dual pro-social and anti-social impact in online communities. 相似文献
6.
Children’s development of a theory of mind 总被引：1，自引：0，他引：1
Maria Rosaria Cadinu Jeff Kiesner 《European Journal of Psychology of Education - EJPE》2000,15(2):93-111
A critical review of the literature on the theory of mind is presented. Consistent with the “early onset” view, it is suggested that important precursors of a theory of mind are found much earlier than the age of 4. Research on emotional development and intentional communication is reviewed to suggest that some rudimentary understanding of other people’s minds occurs before the age of 2. Later, 3-year-olds’ engagement in pretense and deception demonstrates a more sophisticated understanding of other people’s mental states. Limitations of the false belief task for determining the acquisition of a theory of mind will be discussed with reference to findings in the adult literature. 相似文献
7.
Julien Marchalot Jean-Fran?ois Chateaux Magalie Faivre Hichem C. Mertani Rosaria Ferrigno Anne-Laure Deman 《Biomicrofluidics》2015,9(5)
Enrichment of rare cell populations such as Circulating Tumor Cells (CTCs) is a critical step before performing analysis. This paper presents a polymeric microfluidic device with integrated thick Carbon-PolyDimethylSiloxane composite (C-PDMS) electrodes designed to carry out dielectrophoretic (DEP) trapping of low abundance biological cells. Such conductive composite material presents advantages over metallic structures. Indeed, as it combines properties of both the matrix and doping particles, C-PDMS allows the easy and fast integration of conductive microstructures using a soft-lithography approach while preserving O2 plasma bonding properties of PDMS substrate and avoiding a cumbersome alignment procedure. Here, we first performed numerical simulations to demonstrate the advantage of such thick C-PDMS electrodes over a coplanar electrode configuration. It is well established that dielectrophoretic force (FDEP) decreases quickly as the distance from the electrode surface increases resulting in coplanar configuration to a low trapping efficiency at high flow rate. Here, we showed quantitatively that by using electrodes as thick as a microchannel height, it is possible to extend the DEP force influence in the whole volume of the channel compared to coplanar electrode configuration and maintaining high trapping efficiency while increasing the throughput. This model was then used to numerically optimize a thick C-PDMS electrode configuration in terms of trapping efficiency. Then, optimized microfluidic configurations were fabricated and tested at various flow rates for the trapping of MDA-MB-231 breast cancer cell line. We reached trapping efficiencies of 97% at 20 μl/h and 78.7% at 80 μl/h, for 100 μm thick electrodes. Finally, we applied our device to the separation and localized trapping of CTCs (MDA-MB-231) from a red blood cells sample (concentration ratio of 1:10). 相似文献
8.
OBJECTIVE: The aim of this study is to determine: (1) the differences between Spanish and Colombian cultures in relation to community social support variables, and (2) the relationships between community social support variables and child maltreatment in both cultures. METHOD: The study was based on 670 nonabusive families and 166 abusive families. The parents were asked to complete the Community Social Support Questionnaire. This instrument measures community social support in terms of Community Integration and Satisfaction, membership in voluntary organizations and community participation, and use of Community Resources of Social Support. RESULTS: Differences between both cultures were found in the pattern of community social support for the nonabusive groups. However, the relationships between community social support and child maltreatment were similar cross-culturally. Our results indicate that in both cultures abusive parents show lower levels of community integration, participation in community social activities and use of formal and informal organizations than the parents that provide adequate care. CONCLUSIONS: The results largely support the literature that has repeatedly reported the link between social isolation and child maltreatment and they confirm this relation within two cultural contexts, Colombian and Spanish, quite different from the Anglo-Saxon context, where most of the previous studies have been carried out. 相似文献
9.
AbstractIn this article, we discuss the process of standardization of Higher education (HE) initiated by the Bologna Process bringing to the forefront the temporal politics of the standardization of European Higher Education Arena (EHEA). Empirically, we perform a comparative review of the Scorecards indicators at the base of the Bologna Process monitoring project. We argue that the fabrication of EHEA could be seen as the installation of new time-space ‘time’ and ‘space’ appear inevitably intertwined. Instead of being a simple addition, the time space of EHEA interferes with the multiple time spaces of educational institutions and is characterized by being a network time, an unbroken and fragmented temporality sustained, enacted through, and controlled by the fluidity and the malleability of standards. They change recurrently over time, playing with different rhythms. What emerges is an overall arrhythmia that maintains the field permanently in tension. This reconfigures temporality as intrinsically manifold: as multiple and heterogeneous. Moreover, the temporal politics of standards reconfigures perception of past, present and especially future. The current state of implementation is constantly being (re)shaped in relation to the present and future performances, where’s one today level of EHEA targets achievement forms the basis for improvement tomorrow. In this scenario, assessing standards and headline targets become a policy instrument for synchronizing the countries performances, by locating them in a temporal framework that encodes future-oriented dispositions. 相似文献
10.
Clem Herman Rosaria Gracia Lesley Macniven Bernie Clark Geraldine Doyle 《Open Learning》2019,34(1):40-60
ABSTRACTThis paper examines a blended learning model designed to support women returning to STEM after a career break and its delivery in a unique partnership between an online distance education provider and a community-based equality organisation. Through this partnership additional activities such as networking events, returnships, career clinics and webinars were used in conjunction with a structured online Badged Open Course (BOC), which enabled a successful return to employment for many of the participants. This article outlines the results and implications of this integrated model and argues that blended learning approaches need to be flexible and adaptable to be able to incorporate the needs of learners at different life-course stages, taking into consideration gender and other diversity characteristics. 相似文献