Revista Jurídica Digital UANDES
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A Numerical Study of Anti-Vortex Film-Cooling holes Designs in a 1-1/2 Turbine Stage using LES.
No full textThe primary focus of the present study is to investigate the impact of anti-vortex holes design on the film-cooling performance in a film-cooled rotor blade model using the large eddy simulation method (LES). One row of the film holes was positioned on the pressure surface of the rotor blade. This row had three cylindrical holes (the main hole in the present study) with a diameter (D) of 4 mm and a tangential injection angle of 28 deg. Each main hole supplemented with the addition of two symmetrical side holes (anti-vortex holes), which branch out from the same main hole. Three positions for the anti-vortex side holes were considered; namely: upstream to the outlet of the main hole; in line with the main hole; and downstream of the main hole. The Reynolds number was fixed at Re = 1.92 × 105 and the speed of the rotor blade was taken to be 1800 rpm. The blowing ratio varied from 1.0 to 5.0 and the density ratio of coolant to mainstream was 2.0. Compared to the base hole, the film cooling performance of the all anti-vortex cases showed obvious improvement at all blowing ratios. The middle stream side holes and downstream side holes each demonstrated good film cooling performance at all blowing ratios, while the upstream side holes perform well only at a lower blowing ratio. The presence of side holes can restrain the CRVP (counter rotating vortex pairs) intensity of the main hole and reduce the coolant lift-off, improving the film coverage and film cooling effectiveness. The downstream side holes can perform better in reducing the CRVP intensity
Terror and the Dynamism of Islamophobia in 21st Century Britain:The Concentrationary Gothic
No full textThe "sickness unto health":self-reification, self-love and the critique of happiness in contemporary life.
No full textAccess to Collateral and The Democratization of Credit: France's Reform of The Napoleonic Security Code
No full textFrance's Ordonnance 2006‐346 repudiated the notion of possessory ownership in the Napoleonic Code, easing the pledge of physical assets in a country where credit was highly concentrated. A differences‐test strategy shows that firms operating newly pledgeable assets significantly increased their borrowing following the reform. Small, young, and financially constrained businesses benefitted the most, observing improved credit access and real‐side outcomes. Start‐ups emerged with higher “at‐inception” leverage, located farther from large cities, with more assets‐in‐place than before. Their exit and bankruptcy rates declined. Spatial analyses show that the reform reached firms in rural areas, reducing credit access inequality across France's countryside
Mutual funds, tunnelling and firm performance:evidence from China
No full textIn contrast to US companies, Chinese firms have concentrated ownership with the effect that the central agency problem emanates from controlling shareholders expropriating minority shareholders, a phenomenon referred to as ‘tunneling’. This study examines the monitoring effect of mutual funds on the tunneling behavior of controlling shareholders. Due to the distinctive institutional settings in China, including a high level of ownership concentration, underdeveloped legal system in the stock markets and weak governance mechanisms in the mutual fund industry, we find that an increase in mutual fund ownership effectively mitigates the tunneling behavior of controlling shareholders thus improving firm performance. Nonetheless, after the mutual fund ownership reaches a certain threshold, an increase in concentrated mutual fund ownership is associated with heavier tunneling and lower firm performance. This may suggest that concentrated mutual funds collude with controlling shareholders in order to preserve their private interests. Moreover, the above effects are found to be more pronounced for firms with heavier tunneling activities. Our finding of the non-monotonic monitoring role of mutual funds brings attention to the private interest theory for mutual funds, an aspect that has been largely ignored in previous studies on mutual funds
Making sense of Teachers’ (dis)belief in the educational value of social media: A case of two language teachers in Rwanda
No full textThis study reports on the beliefs of two cases of EFL teachers regarding the integration of social media in the teaching of English in Rwanda. Using semi-structured interviews, the study found that the teachers believed social media had the potential to improve their students’ learning of English but could also change their teacher positions within the institution. While both teachers viewed social media positively, their social media practices were more informed by the potential impact of the technology on their status as teachers than its potential pedagogical contribution to students’ learning of English. These findings highlight the importance of understanding teacher’s self-positioning before, during and after technology integration processes to ensure that the proposed technology integration aligns with their image of the self in specific contexts
Social value creation by multinational enterprises: The next “big question” for international business research?
No full textPurpose: This study aims to discuss an argument that the social value creation of multinational enterprises (MNEs), beyond creating economic value for the shareholders, could be the next “big question” for international business (IB) research. The authors also provide examples of promising research topics associated with this research agenda. Design/methodology/approach: The paper is conceptual. Findings: Although a new paradigmatic question for IB in terms of social value creation would lead IB outside familiar territory in terms of the previous focus on financial performance, IB scholars are well equipped to take on this broader question. IB scholars arguably have their key strengths in understanding the inner workings of firms, as well as in understanding the role of context for business. Moreover, to the extent that this new agenda requires IB scholars to acquire new capabilities and form new partnerships with relevant disciplines, this could contribute to revitalising the IB field. As illustrated by the suggested topics, such an agenda could both increase the relevance of IB research and contribute to theory development. Originality/value: The paper is amongst the first to explore the notion that a broader view of the outcome of MNE activities, beyond MNEs’ own financial outcomes, should be a key goal of future IB research.</p
How do medical managers strategize?:A Strategy-as-Practice perspective
No full textStrategic planning (SP) is a widely-used practice within public sector organizations. However, SP does not only take place in strategy workshops and senior management levels. This paper explores how medical managers of English hospitals ‘do’ SP in their clinical directorates. The authors investigate the practices, the usage of strategy tools and the implications of medical managers’ strategizing. The paper argues that what makes financial sense to medical managers strategizing in the local circumstances of their directorates does not always equate to value for patients, the hospital or for the public sector as a whole.</p
Smart Cities (automation, autonomous self-driving cars and urban artificial intelligence)
No full textThe smart city is now a prominent model of urban development. Among its many promises is the optimization of urban transport and mobility. In this chapter we first illustrate the concept of smart city and its many incarnations across the globe. Second, we discuss smart transport as a core element of smart-city agendas. Here we focus on automated and autonomous systems of traffic management, and on autonomous self-driving cars. Finally, we conclude by critically evaluating the potential benefits and dangers of smart urban transport, from a sustainability perspective
The skills premium and the ethnic premium: a cross-national experiment on European attitudes to immigrants
No full textWe introduce a cross-national survey experimental design which combines three different sources of potential variation in migration attitudes – migrant characteristics, native respondent characteristics and national context. Our survey experiment tests the impact of randomly assigned cues for migrant skills (professional or unskilled) and origins (European or non-European) in twenty-one national contexts. In order to make the origins cue both contextually relevant while retaining comparability across contexts, we use the largest poorer European and non-European source countries for migrants in each country as our origins cue. We find that the ‘skills premium’ observed in previous research is universal – in all of our contexts native respondents are more willing to accept skilled professional migrants than unskilled migrants, but with considerable variation in effect size between countries. We find that a significant preference for European over non-European migrants exists in the majority of our countries, but varies a great deal between contexts, and is insignificant in several countries, suggesting that this ‘European premium’ is more contingent than the ‘skills premium’. The two treatment effects are unrelated at the national level, and show only a modest interaction at the individual level, suggesting preferences for high skills and European origins are largely independent of each other. We find no evidence that treatment effects are related to views about the overall impact of immigration at the national level or the individual level. However, some individual attitudes – in particular racial prejudice, social distance and support for anti-discrimination legislation – predict variation in responses to the experimental cues