Search results for "Open"

Open and Closed Positions and Stock Index Futures Volatility

2011

In this paper we analyze the relationship between volatility in index futures markets and the number of open and closed positions. We observe that, although in general both positions are positively correlated with contemporaneous volatility, in the case of S&P 500, only the number of open positions has influence over the volatility. Additionally, we observe a stronger positive relationship on days characterized by extreme movements of these contracting movements dominating the market. Finally, our findings suggest that day-traders are not associated to an increment of volatility, whereas uninformed traders, both opening and closing their positions, have to do with it.

Crack growth analysis at adhesive–adherent interface in bonded joints under mixed mode I/II

2008

The propagation of an interface crack subjected to mixed mode I/II was investigated for two 2024-T351 aluminum thin layers joined by means of DP760 epoxy adhesive produced by 3M©. On the basis of beam theory, an analytical expression for computing the energy release rate is presented for the mixed-mode end loaded split (MMELS) test. The analytical strain energy release rate was compared by finite element (FE) analysis using the virtual crack closure technique (VCCT). Several fatigue crack growth tests were carried out in a plane bending machine to compare the experimental energy release rates to those of the analytical and FE solutions. Experimental results showed the relationship between t…

Enhancing organisational commitment through task significance: the moderating role of openness to experience

2020

International audience; Researchers have extensively explored the factors influencing employees’ organisational commitment. However, few studies make an explicit distinction between different commitment types when exploring its determinants, and the scholarly attention to individual differences is also limited. In this paper, we confirm that developing managerial interventions to enhance task significance can be useful to promote organisational commitment, but this relationship is contingent on the commitment type and the employees’ openness to experience. We focus on two forms of organisational commitment: affective and continuance commitment. Our study shows that task significance is a be…

DON’T GET CAUGHT ON THE WRONG FOOT: A RESOURCE-BASED PERSPECTIVE ON IMITATION THREATS IN INNOVATION PARTNERSHIPS

2017

Innovation partnerships can be a double-edged sword. While they are important vehicles for learning and value creation, such partnerships also increase a firm’s vulnerability to unintended knowledge leakage and imitation by others. In this study, we go beyond previous research by studying the imitation threats induced by innovation partnership portfolios rather than individual alliances. Drawing on the resource-based view, we develop and test a model that links salient structural attributes of partnership portfolios and distinct forms of imitation. Results from our analysis of 803 German manufacturing firms support our prediction that a firm’s probability of being imitated increases with t…

Global Impact of the COVID-19 Pandemic on Cerebral Venous Thrombosis and Mortality

2022

[Background and Purpose] Recent studies suggested an increased incidence of cerebral venous thrombosis (CVT) during the coronavirus disease 2019 (COVID-19) pandemic. We evaluated the volume of CVT hospitalization and in-hospital mortality during the 1st year of the COVID-19 pandemic compared to the preceding year.

Cobalt in strontium titanate based perovskites: preparation, characterization and role in the photocatalytic propene partial oxidation

2016

Strontium titanate perovskite (SrTiO3) and analogous materials in which Y partially substitutes Sr have been prepared as basis to integrate Co in the structure. The Co inserrtion has been performed by wet impregnation or coprecipitation methods. The obtained powders have been physico-chemically characterized and tested as photocatalysts in the propene partial oxidation by using a solar simulating reactor. Correlation between photocatalytic performance and physicochemical characteristics of the different catalysts allows to assess a key role of local nanostructuring of CoOx sites on the selectivity and distribution of products.

Growth Volatility Indices

2006

We study the determinants of growth rate volatility in a multisector economy where sectors are heterogeneous in their individual volatility. We propose a model where aggregate volatility is explained by structural change and the size of the economy. We present a first attempt to test these predictions measuring growth volatility by indices based on Markov transition matrices. Growth volatility appears to (i) decrease with total GDP and (ii) increase with the share of the agricultural sector on GDP, although some nonlinearities appear. Trade openness, which we relate to the size of the economy, also plays a role. In accordance with our model, the explanatory power of per capita GDP, a releva…

Does usable research face higher obstacles within the academy?

2018

The recognition of academic research as a potential source of economic growth and social welfare has attracted the attention of both policy-makers and academics over the past decades. But emphasising the impact of research brings a new set of tensions to scientific governance processes, and raises the risk that academics who engage more with users be hindered in pursuing their research activities. In this paper, we seek to understand whether researchers that meaningfully engage with societal users in their research micro-practices face additional obstacles in their research, whether in terms of the acceptance of that research by academic communities and the absorption of that knowledge by u…

2021

Abstract New digital technologies and tools, together with evolving open physical and digital infrastructures, are remodelling science and innovation practices at universities and challenging their existing cultures, cognitive norms, missions, and policies. The purpose of this empirical study was to understand how existing and recently adopted open science practices and the underlying principles and attitudes of research teams support the advancement of knowledge and the development of actions, solutions, and technologies for sustainable development. The results of this study provide novel insights and important suggestions to guide the advancement of open science and innovation policies at…

Evolutionary relationships among the members of an ancient class of non-LTR retrotransposons found in the nematode Caenorhabditis elegans.

1998

We took advantage of the massive amount of sequence information generated by the Caenorhabditis elegans genome project to perform a comprehensive analysis of a group of over 100 related sequences that has allowed us to describe two new C. elegans non-LTR retrotransposons. We named them Sam and Frodo. We also determined that several highly divergent subfamilies of both elements exist in C. elegans. It is likely that several master copies have been active at the same time in C. elegans, although only a few copies of both Sam and Frodo have characteristics that are compatible with them being active today. We discuss whether it is more appropriate under these circumstances to define only 2 elem…