Curvilinear coordinates for full-core atoms

Curvilinear coordinates, first introduced by F. Gygi for valence-only electronic systems within the local-density functional theory, can be used to describe both core and valence electrons in electronic-structure calculations. A simple and quite general coordinate transformation results in a large, yet affordable plane-wave energy cutoff for full-core systems (e.g., about 120 Ryd for carbon or silicon) within the local-density functional theory, and in a reduced correlation time for full-core variational Monte Carlo calculations. Numerical tests for isolated Li, C, and Si atoms are presented.Comment: 14 pages, 8 Postscript figures; acknowledgements and two refs. adde

Developing an enterprising spirit among engineering college students : what are the educational factors ?

The purpose of this chapter is to further what can be called the Entrepreneurial Spirit. Indeed these words, although widely used, have not yet been properly defined in the literature as to how it is created, and what precise aspects can be enhanced through teaching activities. It is a matter of suggesting hypotheses in order to build up a model of how an Entrepreneurial Spirit is engendered among newly trained engineers. Our chapter is divided into four section. The first deals with the question of the definition of the Entrepreneurial Spirit: How does it arise prior to the decision to set up a business? How can the components of an Entrepreneurial Spirit be defined? We suggest a dynamic model. The second section deals with the factors leading to an Entrepreneurial Spirit among young engineers: What is the relevance of the educational background ? What are the possible teaching method variables within engineering college training? The third section presents methodological features of our research. The fourth section presents early results about the projective dimensions of our model of engineering students in 2004. As a conclusion, we present theoretical and practical implications of our research.entreprising spirit, entrepreneurship education

Absence of superconductivity in iron polyhydrides at high pressures

Recently, C. M. Pépin et al. [Science 357, 382 (2017)] reported the formation of several new iron polyhydrides FeHx at pressures in the megabar range and spotted FeH5, which forms above 130 GPa, as a potential high-Tc superconductor because of an alleged layer of dense metallic hydrogen. Shortly after, two studies by A. Majumdar et al. [Phys. Rev. B 96, 201107 (2017)] and A. G. Kvashnin et al. [J. Phys. Chem. C 122, 4731 (2018)] based on ab initio Migdal-Eliashberg theory seemed to independently confirm such a conjecture. We conversely find, on the same theoretical-numerical basis, that neither FeH5 nor its precursor, FeH3, shows any conventional superconductivity and explain why this is the case. We also show that superconductivity may be attained by transition-metal polyhydrides in the FeH3 structure type by adding more electrons to partially fill one of the Fe-H hybrid bands (as, e.g., in NiH3). Critical temperatures, however, will remain low because the d-metal bonding, and not the metallic hydrogen, dominates the behavior of electrons and phonons involved in the superconducting pairing in these compounds

Hydrogen gas embrittlement and the disc pressure test

A disc pressure test has been used to study the influenced of a hydrogen gas environment on the mechanical properties of three high strength superalloys, Inconel 718, L-605 and A-286, in static and dynamic conditions. The influence of the hydrogen pressure, loading rate, temperature, mechanical and thermal fatigue has investigated. The permeation characteristics of Inconel 718 have been determined in collaboration with the French AEC. The results complemented by a fractographic study are consistent either with a stress-sorption or with an internal embrittlement type of mechanism

Data Basin Climate Center: sharing and manipulating spatial information on the web

Monitoring datasets is essential to detect changes that are occurring and identify thresholds that cause them, but scientists around the world are now generating large volumes of data that vary in quality, format, supporting documentation, and accessibility. Moreover, diverse models are being run at various spatial and temporal scales to try and understand past climate variability and its impacts, generate future climate and land use scenarios, and project potential future impacts to the planet. Conservation practitioners and land managers are struggling to synthesize this wealth of information, identify relevant and usable datasets, and translate evolving science results into on-the-ground climate-aware strategies.
In partnership with ESRI and Mambo media, the Conservation Biology Institute (CBI) is developing a versatile web-based resource that centralizes usable climate change-relevant datasets and provides analytical tools to visualize, analyze, and communicate findings for practical applications. To illustrate its capability to store, manipulate, and derive relevant conclusions to users, we present three examples of projects involving scientists and managers that are part of the Climate Center of Data Basin (http://www.databasin.org): a conservation project in the Puget Sound area of Washington State, a climate change impacts project in California, a North American project looking at climate change impacts on Canada lynx. We conclude by showing the use of this new web tool in workshops that bring together scientists and practitioners, allowing all to access the data and develop more effective management strategies

Data Basin Climate Center: sharing and manipulating spatial information on the web

Monitoring datasets is essential to detect changes that are occurring and identify thresholds that cause them, but scientists around the world are now generating large volumes of data that vary in quality, format, supporting documentation, and accessibility. Moreover, diverse models are being run at various spatial and temporal scales to try and understand past climate variability and its impacts, generate future climate and land use scenarios, and project potential future impacts to the planet. Conservation practitioners and land managers are struggling to synthesize this wealth of information, identify relevant and usable datasets, and translate evolving science results into on-the-ground climate-aware strategies.
In partnership with ESRI and Mambo media, the Conservation Biology Institute (CBI) is developing a versatile web-based resource that centralizes usable climate change-relevant datasets and provides analytical tools to visualize, analyze, and communicate findings for practical applications. To illustrate its capability to store, manipulate, and derive relevant conclusions to users, we present three examples of projects involving scientists and managers that are part of the Climate Center of Data Basin (http://www.databasin.org): a conservation project in the Puget Sound area of Washington State, a climate change impacts project in California, a North American project looking at climate change impacts on Canada lynx. We conclude by showing the use of this new web tool in workshops that bring together scientists and practitioners, allowing all to access the data and develop more effective management strategies

Will the Real Scrutinizer Please Stand Up? The Role and Control of the French European Affairs Committee Over Its Executive

While traditionally considered the losers of European integration, scholars argue that national parliaments have clawed their way back to European affairs. The Lisbon Treaty has also sought to formally empower the national legislatures. However, little academic attention has focused on studying through which channels national parliaments have a say in the supranational arena. This explorative research aims at tackling this issue by analyzing what role the French European Affairs Committee (EAC) plays in EU affairs’ scrutiny and control of the executive. Through a qualitative design based on interviews with EAC members and content analysis, this paper shows that this French committee makes use of police-patrol oversight, rather than fire-alarm scrutiny to follow its executive’s behavior in the EU. However, the EAC remains legislatively powerless in the face of EU negotiations in the Council. Interviews reveal nonetheless that this is not perceived as a problem, as many respondents explain that national interests align at the supranational level, regardless of one’s political affiliation. This contradicts the argument of the importance of opposition in scrutinizing executive conduct. Instead, the French EAC is best conceived as an information hub, for other deputies and citizens, which reinforces the communicative function of the national legislature. This, in turn, questions the legitimacy of empowering national parliaments to solve the democratic deficit of the EU