Movimento no preço das ações após a divulgação de lucro no Brasil

Aparentemente existe uma anomalia no mercado de ações, onde é possível prever excessos de retomo das ações baseando-se em dados passados de divulgação de lucro. Este fenômeno é estatisticamente significante e parece não ser um artefato de amostragem ou metodologia, mas de uma ineficiência de mercado. Estudos mostram uma tendência dos excessos de retornos acumulados das ações se movimentarem na direção da surpresa de lucro, e este movimento se estende por meses após a data de divulgação de lucro trimestral. Neste trabalho mostro que este fenômeno ocorre também no Brasil, mesmo utilizando uma amostra com especificidades do mercado brasileiro e utilizando dados de expectativas de lucro de analistas financeiros no lugar de previsão estatística.

Classical Langevin dynamics of a charged particle moving on a sphere and diamagnetism: A surprise

It is generally known that the orbital diamagnetism of a classical system of charged particles in thermal equilibrium is identically zero —the Bohr-van Leeuwen theorem. Physically, this null result derives from the exact cancellation of the orbital diamagnetic moment associated with the complete cyclotron orbits of the charged particles by the paramagnetic moment subtended by the incomplete orbits skipping the boundary in the opposite sense. Motivated by this crucial but subtle role of the boundary, we have simulated here the case of a finite but unbounded system, namely that of a charged particle moving on the surface of a sphere in the presence of an externally applied uniform magnetic field. Following a real space-time approach based on the classical Langevin equation, we have computed the orbital magnetic moment that now indeed turns out to be non-zero and has the diamagnetic sign. To the best of our knowledge, this is the first report of the possibility of finite classical diamagnetism in principle, and it is due to the avoided cancellation.

Refractive surprise (not)

Well into his ophthalmic journey of retinopexy, cryopexy, vitrectomy and IOL surgery, Professor Nathan Efron's pauses to undertake a forensic examination of his clinical records to identify the source of his refractive surprise.

Field measurement of beef pen manure methane and nitrous oxide reveals a surprise for inventory calculations

Few data exist on direct greenhouse gas emissions from pen manure at beef feedlots. However, emission inventories attempt to account for these emissions. This study used a large chamber to isolate N2O and CH4 emissions from pen manure at two Australian commercial beef feedlots (stocking densities, 13-27 m(2) head) and related these emissions to a range of potential emission control factors, including masses and concentrations of volatile solids, NO3-, total N, NH4+, and organic C (OC), and additional factors such as total manure mass, cattle numbers, manure pack depth and density, temperature, and moisture content. Mean measured pen N2O emissions were 0.428 kg ha(-1) d(-1) (95% confidence interval [CI], 0.252-0.691) and 0.00405 kg ha(-1) d(-1) (95% CI, 0.00114-0.0110) for the northern and southern feedlots, respectively. Mean measured CH4 emission was 0.236 kg ha(-1) d(-1) (95% CI, 0.163-0.332) for the northern feedlot and 3.93 kg ha(-1) d(-1) (95% CI, 2.58-5.81) for the southern feedlot. Nitrous oxide emission increased with density, pH, temperature, and manure mass, whereas negative relationships were evident with moisture and OC. Strong relationships were not evident between N2O emission and masses or concentrations of NO3- or total N in the manure. This is significant because many standard inventory calculation protocols predict N2O emissions using the mass of N excreted by the animal.

Structure of the Pyridine-Chloranil Complex in Solution: A Surprise from Depolarized Hyper-Rayleigh Scattering Measurements

In this article, we report the structure of a 1:1 charge transfer complex between pyridine (PYR) and chloranil (CHL) in solution (CHCl(3)) from the measurement of hyperpolarizability (beta(HRS)) and linear and circular depolarization ratios, D and D', respectively, by the hyper-Rayleigh scattering technique and state-of-the-art quantum chemical calculations. Using linearly (electric field vector along X) and circularly polarized incident light, respectively, we have measured two macroscopic depolarization ratios D = I(X,X)(2 omega)/I(X,Z)(2 omega) and D' = I(X,C)(2 omega)/I(Z,C)(2 omega) in the laboratory fixed XYZ frame by detecting the second harmonic (SH) scattered light in a polarization resolved fashion. The stabilization energy and the optical gap calculated through the MP2/cc-pVDZ method using Gaussian09 were not significantly different to distinguish between the cofacial and T-shape structures. Only when the experimentally obtained beta(HRS) and the depolarization ratios, D and D', were matched with the theoretically computed values from single and double configuration interaction (SDCI) calculations performed using the ZINDO-SCRF technique, we concluded that the room temperature equilibrium structure of the complex is cofacial. This is in sharp contrast to an earlier theoretical prediction of the T-shape structure of the complex.

'The performative surprise': parody, documentary and critique

Can parody help us to 're-imagine' the organizations and institutions we live with (Du Gay 2007, 13)? Or, like many forms of critique, does parody risk being incorporated: becoming part of the power it aims to make fun of? In this paper, drawing on Judith Butler's work, I argue that certain circumstances enable parody to destabilize hegemonic, taken-for-granted institutions (Butler 1990). I explore these ideas through a reading of the Yes Men documentary (Tartan Video 2005). This film features a series of humorous representations of the World Trade Organization (WTO). I show how these act to denaturalize and effectively critique this dominant force in global trade. This paper discusses the value of parody for helping us to re-think and re-make particular institutions and organizations. In doing so, I point to the importance of creating a spectacle in which parody can travel beyond its immediate location, so that it can reach ever newer audiences with its 'performative surprise' (Butler 1990, xxvi). I suggest that the rise of the Internet and inexpensive documentary techniques offer interesting new ways for achieving this.

Le sage étourdi : comédie en 3 actes, représentée pour la première fois à Paris en 1745 ; L'épouse par surprise, comédie en 2 actes : rep résentée pour la première fois à Paris en 1744 (Nouvelle édition) / Boissy

Collection : Le Théâtre ; n° 63