Single port/incision laparoscopic surgery compared with standard three-port laparoscopic surgery for appendicectomy : a randomised controlled trial

PMID: 23111090 [PubMed - indexed for MEDLINE] PMCID: PMC3543288 Free PMC ArticlePeer reviewedPublisher PD

Environmentalism in the EU-28 context: the impact of governance quality on environmental energy efficiency

Environmental policies are a significant cornerstone of a developed economy, but the question that arises is whether such policies lead to a sustainable growth path. It is clear that the energy sector plays a pivotal role in environmental policies, and although the current literature has focused on examining the link between energy consumption and economic growth through an abundance of studies, it does not explicitly consider the role of institutional or governance quality variables in the process. Both globalization and democracy are important drivers of sustainability, while environmentalism is essential for the objective of gaining a “better world.” Governance quality is expected to be the key, not only for economic purposes but also for the efficiency of environmental policies. To that end, the analysis in this paper explores the link between governance quality and energy efficiency for the EU-28 countries, spanning the period 1995 to 2014. The findings document that there is a nexus between energy efficiency and income they move together: the most efficient countries are in the group with higher GDP per capita. Furthermore, the results show that governance quality is an important driver of energy efficiency and, hence, of environmental policies.University of Granad

Ultrafine grained plates of Al-Mg-Si alloy obtained by Incremental Equal Channel Angular Pressing : microstructure and mechanical properties

In this study, an Al-Mg-Si alloy was processed using via Incremental Equal Channel Angular Pressing (I-ECAP) in order to obtain homogenous, ultrafine grained plates with low anisotropy of the mechanical properties. This was the first attempt to process an Al-Mg-Si alloy using this technique. Samples in the form of 3 mm-thick square plates were subjected to I-ECAP with the 90˚ rotation around the axis normal to the surface of the plate between passes. Samples were investigated first in their initial state, then after a single pass of I-ECAP and finally after four such passes. Analyses of the microstructure and mechanical properties demonstrated that the I-ECAP method can be successfully applied in Al-Mg-Si alloys. The average grain size decreased from 15 - 19 µm in the initial state to below 1 µm after four I-ECAP passes. The fraction of high angle grain boundaries in the sample subjected to four I-ECAP passes lay within 53-57 % depending on the examined plane. The mechanism of grain refinement in Al-Mg-Si alloy was found to be distinctly different from that in pure aluminium with the grain rotation being more prominent than the grain subdivision, which was attributed to lower stacking fault energy and the reduced mobility of dislocations in the alloy. The ultimate tensile strength increased more than twice, whereas the yield strength - more than threefold. Additionally, the plates processed by I-ECAP exhibited low anisotropy of mechanical properties (in plane and across the thickness) in comparison to other SPD processing methods, which makes them attractive for further processing and applications

Health and economic growth in high-income countries revisited: evidence from an augmented production function for the period 1980-2009

This paper uses time series data for seven industrialized countries from 1980-2009 to explore the causality between health care expenditure (HCE) and economic growth. We have set up a classical Cobb-Douglas production function including HCE, labor, capital, and an augmented function additionally including the number of patent applications (as a proxy for technology and research) and the total number of tertiary education students (as a proxy for education). Our results show that there is a long-run relationship between growth and HCE. As regards causality, in the classical production function, evidence for mutual causality between GDP and HCE is noted only in France, Germany and England, causality from HCE to GDP is noted in Italy and Japan, while no causality whatsoever is evidenced in Canada and USA. However, a completely different situation is unveiled when the augmented production function is used with mutual causality being noted in all perused variables. The novelty of our study lies first in that it contributes to the health-growth nexus literature for high-income countries which has been quite controversial and second it sets off new variables whose omission might be one of the reasons of the result dichotomy. Results of this study will be very useful for high-income countries currently afflicted by the economic crisis and embark on HCE curtailments or revisions