with the NLSY data and to Daniel Segall for assistance with the AFQT data. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of

twelve contributions from Quillen’s colleagues, collaborators, students, and family. Graeme Segal’s contribution is a broad mathematical biography of Quillen which emphasizes the scope and breadth of his work. Hyman Bass surveys Quillen’s stunning contributions to algebraicK-theory. Quillen’s

with the NLSY data and to Daniel Segall for assistance with the AFQT data. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research. NBER working papers are circulated for discussion and comment purposes. They have

Research article The anti-cyclic citrullinated peptide response in tuberculosis patients is not citrulline-dependent and sensitive to treatment Ori Elkayam * †1, Refael Segal †2, Daniele Bendayan 3, Robert van Uitert 4, Carla Onnekink 5 and Ger JM Pruijn 5 Introduction: Patients with tuberculosis

with independently moti-vated options concerning scalar dimension within the gradable reading accounts for the Travis facts in a simpler, more constrained, and thus ultimately more suc-cessful fashion than recent contextualist analyses such as those in Szabo ́ (2001) or Rothschild and Segal (forthcoming). 1 Green

Geometric models for algebraic K-theory. (English summary) Special issues dedicated to Daniel Quillen on the occasion of his sixtieth birthday, Part IV. K-Theory 20 (2000), no. 4, 311–330. In the paper the authors construct the K-theory space K d (X, Y) using the full subcategory P d (X, Y

Predicting availability to consumers of spatially and temporally variable resources

This paper examines whether cross-listing in the U.S. reduces foreign firms ’ cost of capital. While prior studies document that U.S. cross-listings are associated with substantial increases in firm value, the sources of these valuation effects are not well understood. We estimate the cost of capital effects implied by market prices and analyst forecasts, which allows us to explicitly account for changes in growth expectations around cross-listings. We find strong evidence that firms with cross-listings on U.S. exchanges experience a decrease in their cost of capital, which is economically significant and sustained. Consistent with the bonding hypothesis, we document that these effects are larger for firms from countries with weaker institutional structures. Cross-listings in the over-the-counter market are associated with minor reductions in firms ’ cost of capital, and private placements seem to have adverse effects. We also document positive valuation effects for all types of U.S. cross-listings stemming from changes in (financial analysts’) growth expectations. The latter result could reflect that firms seek to cross-list when

In this thesis, two sets of experimental studies in bosonic and fermionic gases are described. In the first part of the thesis, itinerant ferromagnetism was studied in a strongly interacting Fermi gas of ultracold atoms. The observation of nonmonotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions pro-vides strong evidence for a phase transition to a ferromagnetic state. Our observations imply that itinerant ferromagnetism of delocalized fermions is possible without lattice and band structure, and our data validate the most basic model for ferromagnetism introduced by Stoner. In the second part of the thesis, the coherence properties of a Bose-Einstein con-densate (BEC) was studied in a radio frequency induced double-well potential imple-mented on a microfabricated atom chip. We observed phase coherence between the separated condensates for times up to 200 ms after splitting, a factor of 10 longer than the phase diffusion time expected for a coherent state for our experimental con-ditions. The enhanced coherence time is attributed to number squeezing of the initial

RECHERCHES Elastographie par ondes de cisaillement