“Let’s make lots of money”: the determinants of performance in the recorded music sector     

Juan D. Montoro-Pons  Manuel Cuadrado-García 《Journal of Cultural Economics》2018,42(2):287-307

This research analyzes the performance of 467 record labels in eight European countries over a period of 13 years (2003–2015). The main goal is to explain a relative measure of profitability in terms of observed variables, although the nature of the dataset also allows us to include non-observed firm and country effects. To this end alternative models are estimated and three main research questions are tested, namely: (1) the effect of the dual structure of the recorded music market, in which a competitive segment and an oligopoly coexist; (2) the extent and source of the volatility of profits in record labels; and (3) the nonlinear impact of size on performance.  相似文献   

Children’s and adolescents’ thoughts on pollution: cognitive abilities required to understand environmental systems     

Manuel Rodríguez  Raquel Kohen  Juan Delval 《Environmental Education Research》2015,21(1):76-91

Pollution phenomena are complex systems in which different parts are integrated by means of causal and temporal relationships. To understand pollution, children must develop some cognitive abilities related to system thinking and temporal and causal inferential reasoning. These cognitive abilities constrain and guide how children understand pollution processes. Hence, ascertaining whether changes among children’s ideas of pollution are related to system thinking and inferential reasoning abilities could be useful in improving environmental education. Eighty participants between 9 and 16 years old were interviewed to evaluate how children explain different aspects of pollution-related systems. From the explanations found in these interviews, three progressive epistemic structures were reconstructed. The three epistemic structures differ in the type of causal and temporal relationship established by the participants and in the mechanisms that the participants used to relate the pollutant to its effects.  相似文献   

Postmodern footballers and their ‘second skin’: emotional narratives ranging from solidarity to intimacy     

Manuel González-Ramallal  José L. Castilla  Aníbal Mesa 《Soccer & Society》2015,16(4):437-452

This article underlines some key traits in the make-up of postmodern footballers. Specifically, we discuss the changes in celebrating goals as sporting events in recent years. We contribute a new perspective on the birth of the postmodern ‘me-event’ compared with the ‘goal-event’ typical of modern times. To support our contribution empirically, we use two methodological dimensions: the discourse analysis of international football legislation and photographic and video archive to illustrate the diversity of phenomena with hermeneutic sampling criteria. The differences between the modern and postmodern way of celebrating a goal, individually and/or collectively, highlight a process of social change in which the individual way of celebrating advances rapidly in a society where there is ever greater media coverage and commercialism.  相似文献   

Addressing inequal risk exposure in the development of automated vehicles     

Dietrich  Manuel 《Ethics and Information Technology》2021,23(4):727-738

Ethics and Information Technology - Automated vehicles (AVs) are expected to operate on public roads, together with non-automated vehicles and other road users such as pedestrians or bicycles....  相似文献   

Physiological determinants of speciality of elite middle- and long-distance runners     

Rabadán M  Díaz V  Calderón FJ  Benito PJ  Peinado AB  Maffulli N 《Journal of sports sciences》2011,29(9):975-982

The aim of this study was to determine which physiological variables predict excellence in middle- and long-distance runners. Forty middle-distance runners (age 23 ± 4 years, body mass 67.2 ± 5.9 kg, stature 1.80 ± 0.05 m, VO(2max) 65.9 ± 4.5 ml · kg(-1) · min(-1)) and 32 long-distance runners (age 25 ± 4 years, body mass 59.8 ± 5.1 kg, stature 1.73 ± 0.06 m, VO(2max) 71.6 ± 5.0 ml · kg(-1) · min(-1)) competing at international standard performed an incremental running test to exhaustion. Expired gas analysis was performed breath-by-breath and maximum oxygen uptake (VO(2max)) and two ventilatory thresholds (VT(1) and VT(2)) were calculated. Long-distance runners presented a higher VO(2max) than middle-distance runners when expressed relative to body mass (P < 0.001, d = 1.18, 95% CI [0.68, 1.68]). At the intensities corresponding to VT(1) and VT(2), long-distance runners showed higher values for VO(2) expressed relative to body mass or %VO(2max), speed and oxygen cost of running (P < 0.05). When oxygen uptake was adjusted for body mass, differences between groups were consistent. Logistic binary regression analysis showed that VO(2max) (expressed as l · min(-1) and ml · kg(-1) · min(-1)), VO(2VT2) (expressed as ml · kg(-0.94) · min(-1)), and speed at VT(2) (v(VT2)) categorized long-distance runners. In addition, the multivariate model correctly classified 84.7% of the athletes. Thus, VO(2max), VO(2VT2), and v(VT2) discriminate between elite middle-distance and long-distance runners.  相似文献   

Anticipatory strategies of team-handball goalkeepers     

Gutierrez-Davila M  Rojas FJ  Ortega M  Campos J  Parraga J 《Journal of sports sciences》2011,29(12):1321-1328

This study seeks to discover whether handball goalkeepers employ a general anticipatory strategy when facing long distance throws and the effect of uncertainty on these strategies. Seven goalkeepers and four throwers took part. We used a force platform to analyse the goalkeeper's movements on the basis of reaction forces and two video cameras synchronised at 500 Hz to film the throw using 3D video techniques. The goalkeepers initiated their movement towards the side of the throw 193 ± 67 ms before the release of the ball and when the uncertainty was reduced the time increased to 349 ± 71 ms. The kinematics analysis of their centre of mass indicated that there was an anticipatory strategy of movement with certain modifications when there was greater uncertainty. All the average scores referring to velocity and lateral movement of the goalkeeper's centre of mass are significantly greater than those recorded for the experimental situation with bigger uncertainty. The methodology used has enabled us to tackle the study of anticipation from an analysis of the movement used by goalkeepers to save the ball.  相似文献   

Assessment of muscle fatigue after an ultra-endurance triathlon using tensiomyography (TMG)     

García-Manso JM  Rodríguez-Ruiz D  Rodríguez-Matoso D  de Saa Y  Sarmiento S  Quiroga M 《Journal of sports sciences》2011,29(6):619-625

In this study, we used tensiomyography (TMG) to assess muscle status immediately after an ultra-endurance triathlon. Maximal radial displacement or deformation of the muscle belly, contraction time, delay time, sustain time, and relaxation time were measured for both legs, and dependent t-tests were used to compare means between the beginning and end of the race. The 19 men assessed (age 37.9 ± 7.1 years; height 177.5 ± 4.6 cm; weight: 73.6 ± 6.5 kg) participated in the 2009 edition of the Lanzarote Ironman. Deterioration in the neural response was observed for contraction time (P = 0.008) and relaxation time (P = 0.011), with a moderate decrease in the response time (sustain time) and a loss in muscle stiffness (deformation of the muscle belly). The effect of muscle fatigue on the rectus femoris and biceps femoris was different. Barely any changes in contraction time, relaxation time, sustain time, and deformation of the muscle belly were observed, while only the contraction response time decreased to a significant extent (reduction in delay time; P = 0.003). The considerable loss in contractile capacity induced by a long-distance race was reflected in changes in the neuromuscular response and fluctuations in the contractile capacity of the muscle. These modifications, derived from a prolonged, exhausting effort, can be assessed in a simple, non-aggressive, non-invasive way using tensiomyography.  相似文献   

Private Returns to an University Education: An Instrumental Variables Approach     

Manuel Salas-Velasco 《Higher Education》2006,51(3):411-438

This article examines the determinants of the salaries that Spanish university graduates earn on the labor market. Different earnings equations are estimated that allow us to measure the economic returns to investment in human capital at the university level, demonstrating that: on the one hand, considering schooling to be an exogenous variable gives a downward bias to the estimations of the private rates of return to an university education; on the other hand, not taking into account the aspects of the demand-side of the labor market in the traditional Mincerian earnings function, even though schooling is considered as an endogenous variable, the rates of return estimated for an university education would be given an upward bias. The problem concerning the endogeneity of schooling has been corrected in this article by using the instrumental variables technique.  相似文献   

Students' personal networks in virtual and personal learning environments: a case study in higher education using learning analytics approach     

Oskar Casquero  Ramón Ovelar  Jesús Romo  Manuel Benito  Mikel Alberdi 《Interactive Learning Environments》2016,24(1):49-67

The main objective of this paper is to analyse the effect of the affordances of a virtual learning environment and a personal learning environment (PLE) in the configuration of the students' personal networks in a higher education context. The results are discussed in light of the adaptation of the students to the learning network made up by two undergraduate, inter-university and online courses. Besides, we also examine the influence of this effect in the learning process. The findings reflect the effectiveness of a PLE for facilitating student participation and for assisting students in the creation of larger and more balanced personal networks with richer social capital. However, the findings do not provide evidences about a difference in the learning performance between the two environments. From a methodological point of view, this paper serves as an illustration of the analysis of personal networks on digital data collected from technology-enhanced learning environments.  相似文献   

The management of austerity in higher education: an international comparison     

Manuel Crespo  With the collaboration of Mohammadine Ouardi 《Higher Education》1989,18(4):373-395

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