Search results for " lead"

Prediction of the heat exchange in MEGAPIE facility by using RELAP5 code

2008

¿Cómo se define el liderazgo en la defensa europea? Un análisis fsQCA

2017

The paper addresses the issue of national leadership in the politics of European defence, in order to determine the relative value of different factors in the exercise of leadership, and the reasons why some countries are more willing than others to contribute to the development of the EU’s Common Security and Defence Policy. The article starts by discussing the main contributions of the (neo)realist and constructivist approaches to European leadership on defence. It then highlights the process of development of EU defence policy and its setbacks. Leadership factors that characterize this development process are identified and employed to construct a fsQCA analysis, which assesses the leade…

Efficient vacuum deposited p-i-n and n-i-p perovskite solar cells employing doped charge transport layers

2016

Methylammonium lead halide perovskites have emerged as high performance photovoltaic materials. Most of these solar cells are prepared via solution-processing and record efficiencies (>20%) have been obtained employing perovskites with mixed halides and organic cations on (mesoscopic) metal oxides. Here, we demonstrate fully vacuum deposited planar perovskite solar cells by depositing methylammonium lead iodide in between intrinsic and doped organic charge transport molecules. Two configurations, one inverted with respect to the other, p-i-n and n-i-p, are prepared and optimized leading to planar solar cells without hysteresis and very high efficiencies, 16.5% and 20%, respectively. It is t…

Shanghai Teachers’ Perceptions of Distributed Leadership: Resources and Agency

2021

Purpose:Drawing on distributed leadership and motivation theories, this study investigates teachers’ perceptions of resource and agency distributions and identifies the key factors motivating leadership among teachers.Design/Approach/Methods:This quantitative study collected data from 327 teachers in nine schools in Shanghai. Chi-square tests of independence were conducted to examine the associations between leadership structures and power distance, while Spearman’s correlation tests were used to identify changes in leadership resource impact. A nonparametric Friedman’s test was applied to detect discrepancies between the agency of principals, team leaders, and teachers. Finally, Chi-square…

Il lato oscuro della leadership: Framework concettuale e contributo esplorativo

2015

Introduzione: La letteratura sulla leadership, storicamente, si è focalizzata sugli elementi che rendono la relazione capo-collaboratore efficace, cercando di individuare i fattori funzionali a una leadership di successo, dedicando poco spazio a una riflessione su cosa rende un leader inefficace o distruttivo. Solo di recente, diversi studiosi hanno provato a fare chiarezza sul tema del lato oscuro della leadership, proponendo diversi costrutti, come ad esempio “leader repulsivo” (Pearce e Sims, 2002), “leader bullo” (Ferris, 2007), “leader tossico” (Lipman-Blumen, 2005), “manager compromesso” (Lubit, 2004). Tuttavia queste ed altre definizioni sono spesso orientate solo su alcuni comportam…

Teachers’ Evidence-Based Actions

2013

Currently, there is a dynamic development in the German school system. It is a new governance model which has been designed to have measurable effects on the political regulation of education.

Bronze Sculptures and Lead Objects Tell Stories About Their Creators: Investigation of Renaissance Sculptures and Ancient Ingots by Means of Neutron …

2016

Renaissance bronze objects from the Rijksmuseum (Amsterdam) col- lection and lead ingots from ancient roman shipwrecks found near Sicily (Italy) were studied by means of neutron tomography. This was done with the aim to visualize and to measure the inner structures of the objects. In this way information about the manufacturing processes in the 16th century and the conservation status from the inside of the bronze sculptures was gained. Inscriptions found under the corrosion layer of the lead ingots gave hints about the trade routes in the past. Neutron imaging was proven perfect to transmit the relatively thick layers of Pb and Cu alloys while ceramic remains, soldering connections and cor…

FORMATION OF TEACHERS’ COMPETENCES IN FURTHER EDUCATION

2019

The interest of contemporary society in improving the quality of education is mainly reflected in the issue of educational results - competences - and their provision in the learning process. Introducing the 21st Century educational standards, the development of competencies required for teaching become more relevant.  International documents indicate that a teacher should have the ability to teach, effectively use technologies in learning, help students gain transversal competencies. The teacher should be able to participate in research, use innovation, reflect on his/her work, collaborate with colleagues and parents. It is the teacher’s duty to direct the student's individual development.…

Self-Efficacy and Resilience: Mediating Mechanisms in the Relationship Between the Transformational Leadership Dimensions and Well-Being

2019

The objective of this article is to test the roles of self-efficacy and resilience as consecutive mediators in the relationship between the four dimensions of transformational leadership and well-being (operationalized as psychosomatic complaints and psychological distress). The sample consists of 225 social services employees in Spain. Data were gathered at two time points with a time-lag of 6 months. We used path analysis to test the hypothesized model and Monte Carlo confidence intervals to check the significance of the indirect effects. Our results showed that only two of the four transformational leadership dimensions have a direct impact on self-efficacy: inspirational motivation and…

Linking transformational leadership to nurses’ extra-role performance: the mediating role of self-efficacy and work engagement

2011

salanova m., lorente l., chambel m.j. & martinez i.m. (2011) Linking transformational leadership to nurses’ extra-role performance: the mediating role of self-efficacy and work engagement. Journal of Advanced Nursing 67(9), 2256–2266. Abstract Aims.  This paper is a report of a social cognitive theory-guided study about the link between supervisors’ transformational leadership and staff nurses’ extra-role performance as mediated by nurse self-efficacy and work engagement. Background.  Past research has acknowledged the positive influence that transformational leaders have on employee (extra-role) performance. However, less is known about the psychological mechanisms that may explain the lin…