A new approach to the metric of journals’ scientific prestige: The SJR indicator     

Borja González-Pereira  Vicente P. Guerrero-Bote  Félix Moya-Anegón 《Journal of Informetrics》2010,4(3):379-391

A size-independent indicator of journals’ scientific prestige, the SCImago Journal Rank (SJR) indicator, is proposed that ranks scholarly journals based on citation weighting schemes and eigenvector centrality. It is designed for use with complex and heterogeneous citation networks such as Scopus. Its computation method is described, and the results of its implementation on the Scopus 2007 dataset is compared with those of an ad hoc Journal Impact Factor, JIF(3y), both generally and within specific scientific areas. Both the SJR indicator and the JIF distributions were found to fit well to a logarithmic law. While the two metrics were strongly correlated, there were also major changes in rank. In addition, two general characteristics were observed. On the one hand, journals’ scientific influence or prestige as computed by the SJR indicator tended to be concentrated in fewer journals than the quantity of citation measured by JIF(3y). And on the other, the distance between the top-ranked journals and the rest tended to be greater in the SJR ranking than in that of the JIF(3y), while the separation between the middle and lower ranked journals tended to be smaller.  相似文献   

The construction of parents and teachers as agents for the improvement of municipal schools in Chile     

Carmen Montecinos  Vicente Sisto  Luis Ahumada 《比较教育学》2010,46(4):487-508

This article examines how teachers and parents in 10 municipal schools serving students growing up under conditions of social vulnerability represented themselves, and others, as valid agents for charting school improvement. In four schools parents and teachers saw each other as trustworthy and collaborating to provide an education that could transform students’ life chances. In the other six schools, social relations were marked by distrust, staff constructed students as lacking the resources necessary to benefit from a rigorous academic programme, and parents in leadership positions shared with teachers the belief that school failure could largely be attributed to uncommitted parents. These results suggest that the impact of quality assurance policies tends to be associated with the social capital of municipal schools, thus educational policy needs to consider developing and strengthening social capital within schools.  相似文献   

A general result on non-existence of finite-time stable equilibria in fractional-order systems     

Aldo-Jonathan Muñoz-Vázquez  Anand Sánchez-Orta  Vicente Parra-Vega 《Journal of The Franklin Institute》2019,356(1):268-275

It is well known that a fractional-order system with a continuous right hand side does not have finite-time stable equilibria, but the discontinuous case has remained elusive in literature. Thus, based on novel mathematical tools, recently published in literature, it is demonstrated that attaining finite-time stable equilibria is not possible for a fractional-order system, not even in the case of an impulsive or discontinuous feedback. In consequence, it is demonstrated that, for a fractional-order system, a Lyapunov stable equilibrium cannot be at the same time finite-time stable.  相似文献   

The visible hand of cluster policy makers: An analysis of Aerospace Valley (2006-2015) using a place-based network methodology     

D. Lucena-Piquero  Jérôme Vicente 《Research Policy》2019,48(3):830-842

The paper focuses on cluster policies with particular attention to the role of R&D collaborative incentives in the structuring of knowledge networks in clusters. We disentangle the main network failures in regional innovation systems, and discuss the selection procedures designed by policy makers to foster knowledge collaborations. We draw evidence from the French Aerospace Valley cluster from 2006 to 2015. The case study is based on a dataset of 248 granted research consortia, from which we build 4-cohort knowledge networks that enable us evidencing the evolving structural properties of the cluster over time. We suggest avoiding the bias and limitations of 1 and 2-mode network analysis by developing an original place-based network methodology that emphasizes on structural equivalence and groups’ behaviors. We discuss the results focusing on the convergence degree between the structural properties of the cluster selected by the Program and the policy makers’ objectives. Finally, the methodology allows us to identify the agents of the structural and technological changes observed throughout the period.  相似文献   

Bone mass,bone mineral density and muscle mass in professional golfers     

Dorado C  Sanchis Moysi J  Vicente G  Serrano JA  Rodríguez LR  Calbet JA 《Journal of sports sciences》2002,20(8):591-597

The aim of this study was to determine the effects of long-term professional golf participation on whole-body and regional bone mass and density. Dual-energy X-ray absorptiometry was performed on 15 male professional golfers and 18 sedentary individuals, matched for sex, race, age (29+/-1 and 25+/-1 years, respectively), body mass (79+/-2 and 74+/-2 kg), height (1.78+/-0.01 and 1.77+/-0.02 m) and percent body fat (20+/-2 and 21+/-2%; mean +/- sx). We found that long-term professional golf participation is not associated with significant increments in regional or whole-body bone mass or density. Neither the lumbar spine nor the femoral neck showed any noticeable enhancement of bone mass in professional golfers compared with controls from the same population. The only effect of professional golf participation on regional body composition was a 9% increase in muscle mass in the dominant arm (P < 0.05).  相似文献   

Sodium bicarbonate ingestion does not alter the slow component of oxygen uptake kinetics in professional cyclists   总被引：3，自引：0，他引：3  

Santalla A  Pérez M  Montilla M  Vicente L  Davison R  Earnest C  Lucía A 《Journal of sports sciences》2003,21(1):39-47

We examined the effects of pre-exercise sodium bicarbonate (NaHCO3) ingestion on the slow component of oxygen uptake (VO2) kinetics in seven professional road cyclists during intense exercise. One hour after ingesting either a placebo or NaHCO3 (0.3 g x kg body mass(-1)), each cyclist (age, 25 +/- 2 years; VO2max, 74.7 +/- 5.9 ml x kg(-1) x min(-1); mean +/- s) performed two bouts of 6 min duration at an intensity of 90% VO2max interspersed by 8 min of active recovery. Gas exchange and blood data (pH, blood lactate concentration and [HCO3-]) were collected during the tests. In both bouts, the slow component of VO2 was defined as the difference between end-exercise VO2 and the VO2 at the end of the third minute. No significant difference was found in the slow component of VO2 between conditions in the first (NaHCO3, 210 +/- 69 ml; placebo, 239 +/- 105 ml) or second trial (NaHCO3, 123 +/- 88 ml; placebo, 197 +/- 101 ml). In conclusion, pre-exercise NaHCO3 ingestion did not significantly attenuate the VO2 slow component of professional road cyclists during high-intensity exercise.  相似文献   

La Genèse de l’Opération d’Addition. Analyse de quelques Variables Significatives dans la Résolution de Problèmes Additifs     

Bermejo  Vicente  Rodr&#;guez  Purificaci&#;n 《European Journal of Psychology of Education - EJPE》1988,3(1):75-76

European Journal of Psychology of Education -  相似文献   

An empirical analysis of e-participation. The role of social networks and e-government over citizens' online engagement     

María Rosalía Vicente  Amparo Novo 《Government Information Quarterly》2014

The aim of this paper is to further explore the drivers behind the decision of citizens to engage in social and political participation on the internet, since mixed empirical evidence has been found in the literature. Using data from the 2011 survey on the use of information and communications technologies by households and individuals in Spain, the following two types of e-participation are analyzed: reading/giving opinions about social/political issues and signing/taking part in online petitions/public consultations. Relying on an updated version of the resources approach, we investigate as to what extent e-participation is explained not only by traditional participation-related resources (i.e., socio-economic characteristics) but also by digital skills, social networks and the online development of public administrations. Results show that, while online participation is mainly associated with internet-related skills, there is a significant gender gap. Interestingly, the unemployed tend to engage socially and politically online more than the rest of the population.  相似文献   

A motivation perspective on faculty mentoring: the notion of “non-intrusive” mentoring practices in science and engineering     

Vicente M. Lechuga 《Higher Education》2014,68(6):909-926

Scholars have offered numerous approaches and best practices for mentoring faculty, many of which have provided valuable insight into the complex nature of the mentoring process. Yet, little attention has been paid to how faculty mentoring practices can influence a mentee’s intrinsic motivation. Through a series of 15 interviews with faculty members from mathematics, engineering, and life science, coupled with the use of self-determination theory, the author demonstrates how disciplinary backgrounds influence their needs for autonomy, competency, and connectedness, which effects their intrinsic motivation to engage in scholarly work. The author highlights three themes that speak to the notion of “non-intrusive” mentoring practices that can help foster and sustain motivation, and argues that future research is needed to shed more light on how disciplinary cultures influence mentoring.  相似文献   

Black boxes in analytical chemistry： University students misconceptions of instrumental analysis     

Antonio Domenech Carbo  Jose Vicente Gimeno Adelantado Francisco Bosch Reig 《美中教育评论》2010,7(7):15-29

Misconceptions of chemistry and chemical engineering university students concerning instrumental analysis have been established from coordinated tests, tutorial interviews and laboratory lessons. Misconceptions can be divided into： （1） formal, involving specific concepts and formulations within the general frame of chemistry; （2） operational/topical, dealing with specific capabilities, problems and operations in chemistry; （3） methodological, associated to peculiar methods of analytical chemistry and data treatment; and （4） social, regarding the relation of analytical data with the social frame. Such misconceptions define a non-structured view of analytical methods, procedures and protocols related with analytical instrumentation. Instruments are frequently viewed as an autonomous, error-free black box providing non-structured data with no need of calibration or control, whereas weak relationships are established between data and aims along the analytical process.  相似文献