Managing tensions and paradoxes between stakeholders in a complex project context: Case study and model proposal

Stakeholder (SH) management has recently undertaken a turn from the traditional management "of" to managing "for" and "with" SH. Relating to this relational trend, identification and management tensions between SH is an important area of study. Indeed, from how to live with and/or resolve or not those tensions depend on the possibility of building the most beneficial cooperation possible between SH for the continuation of the project, to obtain win-win results, and to promote the shared value and common good. For this purpose, a theoretical model is suggested, based on the approaches of paradoxes and conventionalist economy of worth, supporting the identification of tensions between SH and their justifications, and the clarification it helps to bring as to win-win or shared value outcomes, or the absence of such, in the context of a complex project. The suggested model is then used in an exploratory case study. The goal is to assess its relevance, usefulness, and quality. Two theoretical contributions emerge from the data analyzed: 1) several tensions over various categories (allegiance, dimensional, temporal, learning, performance and spatial) can draw on the same justifications (rationale that opposes industrial and domestic conventions); 2) prioritization of tension categories can make it easier to resolve them. © 2016 Editora Mundos Sociais. All rights reserved

Vibrations of a chain of Xe atoms in a groove of carbon nanotube bundle

We present a lattice dynamics study of the vibrations of a linear chain of Xe adsorbates in groove positions of a bundle of carbon nanotubes. The characteristic phonon frequencies are calculated and the adsorbate polarization vectors discussed. Comparison of the present results with the ones previously published shows that the adsorbate vibrations cannot be treated as completely decoupled from the vibrations of carbon nanotubes and that a significant hybridization between the adsorbate and the tube modes occurs for phonons of large wavelengths.Comment: 3 PS figure

Renal magnesium handling: New insights in understanding old problems

Many sharp-eyed readers have pointed out to us that in the photo next to the article about yams in Ghana (Spore 87, June 2000, page 8), the woman had put all her cassava in one basket, and not the yams she planned to use. Point taken. Whatever you want to point out, point to or point at, your letters, faxes and emails are always welcome at the Spore address in the box on the right. Write now.MailboxMany sharp-eyed readers have pointed out to us that in the photo next to the article about yams in Ghana (Spore 87, June 2000, page 8), the woman had put all her cassava in one basket, and not the yams she planned to use. Point taken...

Heteroepitaxy of La2O3La_2O_3 and La2−xYxO3La_{2-x}Y_xO_3 on GaAs (111)A by Atomic Layer Deposition: Achieving Low Interface Trap Density

GaAs metal–oxide–semiconductor devices historically suffer from Fermi-level pinning, which is mainly due to the high trap density of states at the oxide/GaAs interface. In this work, we present a new way of passivating the interface trap states by growing an epitaxial layer of high-k dielectric oxide, $La_{2–x}Y_xO_3$, on GaAs(111)A. High-quality epitaxial $La_{2–x}Y_xO_3$ thin films are achieved by an ex situ atomic layer deposition (ALD) process, and GaAs MOS capacitors made from this epitaxial structure show very good interface quality with small frequency dispersion and low interface trap densities $(D_{it})$. In particular, the $La_2O_3$/GaAs interface, which has a lattice mismatch of only 0.04%, shows very low $D_{it}$ in the GaAs bandgap, below $3 × 10^{11} cm^{–2} eV^{–1}$ near the conduction band edge. The $La_2O_3$/GaAs capacitors also show the lowest frequency dispersion of any dielectric on GaAs. This is the first achievement of such low trap densities for oxides on GaAs.Chemistry and Chemical Biolog

Middle and Late Pleistocene environmental history of the Marsworth area, south-central England

To elucidate the Middle and Late Pleistocene environmental history of south-central England, we report the stratigraphy, sedimentology, palaeoecology and geochronology of some deposits near the foot of the Chiltern Hills scarp at Marsworth, Buckinghamshire. The Marsworth site is important because its sedimentary sequences contain a rich record of warm stages and cold stages, and it lies close to the Anglian glacial limit. Critical to its history are the origin and age of a brown pebbly silty clay (diamicton) previously interpreted as weathered till. The deposits described infill a river channel incised into chalk bedrock. They comprise clayey, silty and gravelly sediments, many containing locally derived chalk and some with molluscan, ostracod and vertebrate remains. Most of the deposits are readily attributed to periglacial and fluvial processes, and some are dated by optically stimulated luminescence to Marine Isotope Stage (MIS) 6. Although our sedimentological data do not discriminate between a glacial or periglacial interpretation of the diamicton, amino-acid dating of three molluscan taxa from beneath it indicates that it is younger than MIS 9 and older than MIS 5e. This makes a glacial interpretation unlikely, and we interpret the diamicton as a periglacial slope deposit. The Pleistocene history reconstructed for Marsworth identifies four key elements: (1) Anglian glaciation during MIS 12 closely approached Marsworth, introducing far-travelled pebbles such as Rhaxella chert and possibly some fine sand minerals into the area. (2) Interglacial environments inferred from fluvial sediments during MIS 7 varied from fully interglacial conditions during sub-stages 7e and 7c, cool temperate conditions during sub-stage 7b or 7a, temperate conditions similar to those today in central England towards the end of the interglacial, and cool temperate conditions during sub-stage 7a. (3) Periglacial activity during MIS 6 involved thermal contraction cracking, permafrost development, fracturing of chalk bedrock, fluvial activity, slopewash, mass movement and deposition of loess and coversand. (4) Fully interglacial conditions during sub-stage 5e led to renewed fluvial activity, soil formation and acidic weathering

An aminostratigraphy for the British Quaternary based on Bithynia opercula

Aminostratigraphies of Quaternary non-marine deposits in Europe have been previously based on the racemization of a single amino acid in aragonitic shells from land and freshwater molluscs. The value of analysing multiple amino acids from the opercula of the freshwater gastropod Bithynia, which are composed of calcite, has been demonstrated. The protocol used for the isolation of intra-crystalline proteins from shells has been applied to these calcitic opercula, which have been shown to more closely approximate a closed system for indigenous protein residues. Original amino acids are even preserved in bithyniid opercula from the Eocene, showing persistence of indigenous organics for over 30 million years. Geochronological data from opercula are superior to those from shells in two respects: first, in showing less natural variability, and second, in the far better preservation of the intra-crystalline proteins, possibly resulting from the greater stability of calcite. These features allow greater temporal resolution and an extension of the dating range beyond the early Middle Pleistocene. Here we provide full details of the analyses for 480 samples from 100 horizons (75 sites), ranging from Late Pliocene to modern. These show that the dating technique is applicable to the entire Quaternary. Data are provided from all the stratotypes from British stages to have yielded opercula, which are shown to be clearly separable using this revised method. Further checks on the data are provided by reference to other type-sites for different stages (including some not formally defined). Additional tests are provided by sites with independent geochronology, or which can be associated with a terrace stratigraphy or biostratigraphy. This new aminostratigraphy for the non-marine Quaternary deposits of southern Britain provides a framework for understanding the regional geological and archaeological record. Comparison with reference to sites yielding independent geochronology, in combination with other lines of evidence, allows tentative correlation with the marine oxygen isotope record

Introduction de la bioraffinerie et de la problématique de transition énergétique dans la filière bois : quelles logiques de transformation ?

National audienceLe changement climatique impose désormais de nouvelles perspectives, ou contraintes de développement, aux filières industrielles à fort impact environnemental telles que les filières forêt bois papier. Or la filière forêt bois papier, au niveau français comme au niveau Canadien, est soumise à un fort déclin. La bioéconomie apparait alors comme une solution pour modifier ces filières qui tendent à diversifier leurs activités industrielles s’inscrivant dans le secteur de la chimie verte et de la bioraffinerie (Tissot-Colle, C. and J. Jouzel 2013). Ces projets, exogènes ou endogènes, façonnent différemment la transition de la filière forêt bois et soulèvent des problématiques en matière d’innovation technologique mais également par rapport aux différentes stratégies d’acteurs et à l’émergence de gouvernance inhérente à la pression alors exercée sur les ressources naturelles (Cherubini, F. and A. H. Strømman 2011). Il s’agit donc de comprendre la construction historique des patrimoines productifs des filières forêt bois papier afin d’en déterminer les dynamiques d’évolution. Ces dynamiques proviennent alors des visions que les parties prenantes imaginent à partir de leurs interactions dans la double optique d’usage et de conservation de la ressource forestière. La résolution des conflits d’usage qui en résultent interroge alors évidence les divergences de stratégies d’action entre acteur public et acteur privé et leur impact sur différents modes de gouvernance. L’approche patrimoniale permettra donc de conceptualiser le coeur des filières impliquées, tandis que l’économie institutionnaliste permettra d’apporter des éléments de compréhension par rapport au mode de construction des organisations actives ou institutions. La problématique de l’ancrage territorial sera questionnée à chaque niveau d’analyse et à leur croisement, pour la délimitation des filières, des patrimoines productifs, des conflits d’usage et des articulations entre patrimoines productifs et patrimoines naturels, dans la définition des trajectoires technologiques et systèmes d’innovation. Afin d’illustrer ces objectifs de recherche, 4 études de cas permettront de réaliser une double comparaison. Une comparaison d’ordre territorial, en mettant en parallèle les systèmes Nord-Américains et Européen à travers le cas Québécois et le cas français, ainsi qu’une comparaison au niveau des types de perturbations de la filière forêt bois, endogènes ou exogènes