Is Law an Economic Contest? French Reactions to the Doing Business World Bank Reports and Economic Analysis of the Law

The economic analysis of law has provoked strong reactions among French academics, in particular since 2004 when the first of the Doing Business reports was published. French jurists have joined forces to expose the methodological limits inherent to these reports, which rated France a long way behind other legal systems allegedly more able to facilitate business. In its first part, this article examines the various reactions to these reports, almost all of which were published in French only. In the second part, the focus is on the position of economic analysis in French law, its role, and, in particular, the impact of the Law and Economics school on comparative law in France. It also takes a look at the studies that followed, especially the legal origins thesis. The article shows that the various approaches are complementary and that economic analysis, without supplanting the traditional comparative approach, has considerable use. At a time when the globalization of business relationships is leading more than ever to a competition between the various national laws, comparatists should include more of this dimension into their field of study. Comparatists can also take a cue from economists on how to improve the relevance and the influence of their research in the public debate

Variation around a Pyramid theme: optical recombination and optimal use of photons

We propose a new type of Wave Front Sensor (WFS) derived from the Pyramid WFS (PWFS). This new WFS, called the Flattened Pyramid-WFS (FPWFS), has a reduced Pyramid angle in order to optically overlap the four pupil images into an unique intensity. This map is then used to derive the phase information. In this letter this new WFS is compared to three existing WFSs, namely the PWFS, the Modulated PWFS (MPWFS) and the Zernike WFS (ZWFS) following tests about sensitivity, linearity range and low photon flux behavior. The FPWFS turns out to be more linear than a modulated pyramid for the high-spatial order aberrations but it provides an improved sensitivity compared to the non-modulated pyramid. The noise propagation may even be as low as the ZWFS for some given radial orders. Furthermore, the pixel arrangement being more efficient than for the PWFS, the FPWFS seems particularly well suited for high-contrast applications.Comment: 4 pages, 4 figures, accepted for publication in Optics Letters - Version corrected for affiliation

Ion exchange membranes based upon crosslinked sulfonated polyethersulfone for electrochemical applications

Synthesis and characterization of new ion exchange membranes made from chlorosulfonated polyethersul- fone (SO2Cl-PES) crosslinked by polyaminated crosslinking reagents have been performed. Two examples are described: one crosslinked by hexane diamine, the other by amino-polyethersulfone (NH2-PES). Sulfonated polyether sulfone (S-PES) and NH2-PES have similar chemical structures that allow compatibility. Surpris- ingly enough, better results were obtained using amino-polyethersulfone. The best results have been obtained using SO2Cl-PES with 1.3 SO2Cl group per monomer unit crosslinked by 0.2 equivalent of NH2-PES. The membranes, less brittle than pristine SPES and insoluble in solvents such as DMAc, were characterized by TGA, DMA, DSC, ionic conductivity, transport numbers, and water swelling. The results showed that these membranes presented very promising performances for use in Proton Exchange Membrane Fuel Cells