Observing different quantum trajectories in cavity QED

The experimental observation of quantum jumps is an example of single open quantum systems that, when monitored, evolve in terms of stochastic trajectories conditioned on measurements results. Here we present a proposal that allows the experimental observation of a much larger class of quantum trajectories in cavity QED systems. In particular, our scheme allows for the monitoring of engineered thermal baths that are crucial for recent proposals for probing entanglement decay and also for entanglement protection. The scheme relies on the interaction of a three-level atom and a cavity mode that interchangeably play the roles of system and probe. If the atom is detected the evolution of the cavity fields follows quantum trajectories and vice-versa.Comment: 5 pages, 2 figure

Modeling and forecasting the volatility of Brazilian asset returns

The goal of this paper is twofold. First, using five of the most actively traded stocks in the Brazilian financial market, this paper shows that the normality assumption commonly used in the risk management area to describe the distributions of returns standardized by volatilities is not compatible with volatilities estimated by EWMA or GARCH models. In sharp contrast, when the information contained in high frequency data is used to construct the realized volatility measures, we attain the normality of the standardized returns, giving promise of improvements in Value-at-Risk statistics. We also describe the distributions of volatilities of the Brazilian stocks, showing that they are nearly lognormal. Second, we estimate a simple model to the log of realized volatilities that differs from the ones in other studies. The main difference is that we do not find evidence of long memory. The estimated model is compared with commonly used alternatives in an out-of-sample forecasting experiment.

Algebraic characterization of anomalies in chiral WW_{3} gravity

The anomalies which occur in chiral WW_{3} gravity are characterized by solving the BRS consistency condition.Comment: 25 pages, report CBPF-NF-042/9

Histometric evaluation of bioactive glass, platelet-rich plasma and their association with guided tissue regeneration on the treatment of periodontal defects in dogs

Orientadores: Enilson Antonio Sallum, Francisco Humberto Nociti JuniorTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: O objetivo do presente trabalho foi avaliar histometricamente o efeito do plasma rico em plaquetas (PRP), do vidro bioativo (Perioglas?) e sua associação sobre a regeneração periodontal em defeitos intra-ósseos de 3 paredes, além de sua combinação à regeneração tecidual guiada (RTG) em defeitos de furca grau II em cães. Foram incluídos 9 cães, fêmeas, de raça indefinida e pesando aproximadamente 15Kg. Os animais tiveram os segundos e quartos pré-molares e segundos molares mandibulares extraídos. Decorridas 12 semanas das extrações, foram criados cirurgicamente 4 defeitos intra-ósseos de 3 paredes (dimensões 4x4x4mm), sendo 2 nas faces mesiais e 2 nas faces distais dos primeiros molares mandibulares. Outros 2 defeitos do tipo furca grau II (5x2mm) foram criados na face vestibular dos terceiros pré-molares mandibulares. Em todos os defeitos foram utilizados dispositivos para cronificação durante 4 semanas. Uma semana após a remoção dos dispositivos de cronificação, os animais foram então submetidos à cirurgia para tratamento dos defeitos. O lado que recebeu os tratamentos com o PRP foi inicialmente sorteado, sendo então designados aleatoriamente os respectivos tratamentos: Controle (C); Vidro Bioativo (VB); Plasma Rico em Plaquetas (PRP) e PRP+VB, para os defeitos intra-ósseos. O lado que recebeu os tratamentos PRP e VB+PRP teve o defeito de furca grau II tratado com a associação do PRP+VB+RTG, sendo o dente contra lateral tratado com VB+RTG. Decorridas 12 semanas das cirurgias de tratamento, os animais foram sacrificados. Após processamento histológico, procedeu-se com a avaliação histométrica. Não foram observadas diferenças significantes para os parâmetros avaliados nos defeitos intra-ósseos. A extensão de epitélio foi 2,24±0,58 mm, 1,94±0,37 mm, 1,97±0,37 mm e 1,81±0,61 mm para, Controle, VB, PRP e PRP + VB, respectivamente. A adaptação conjuntiva sem formação de cemento foi 0,90±0,28 mm, 0,84±0,41 mm, 1,07±0,27 mm e 1,15±0,32 mm, respectivamente. A extensão de novo cemento foi 2,63±0,70 mm, 2,56±0,36 mm, 2,37±0,38 mm e 3,10±0,47 mm, respectivamente. A extensão de novo osso foi 4,77±0,44 mm, 4,64±0,68 mm, 4,67±0,46 mm e 4,84±0,42 mm, respectivamente. A porcentagem de preenchimento do defeito foi 47% no grupo C, 50% com VB, 53% com PRP e 50% com VB+PRP. Para os defeitos de furca verificou-se diferença significante na formação de novo cemento em favor do grupo VB+PRP+RTG (p=0,035). Dento dos limites deste estudo pode-se concluir que o uso do VB e PRP de forma isolada ou associada não promoveram efeito adicional à regeneração periodontal em defeitos intra-ósseos de três paredes em cães. Entretanto, pode-se concluir também que o uso do PRP promoveu uma maior formação de cemento em defeitos de furca grau II em cães, quando associado ao VB e à RTGAbstract: The objective of the present study was to evaluate at the histological level the effect of platelet-rich plasma (PRP), bioactive glass (BG) and his association on periodontal regeneration of 3-wall intrabony defects and its combination with guided tissue regeneration (GTR) on the regeneration of class II lesions in dogs. Nine mongrel dogs with approximately 15Kg were used in the experiment. The animals had the second premolar, fourth premolar and second molar at the mandible extracted. After twelve weeks, three-wall intra-bony defects (4x4x4m) were surgically created at the mesial and distal aspect of first mandibular molar. Class II furcation lesions (5x2mm) were surgically created, bilaterally, at the buccal aspect of mandibular third premolar. All defects were exposed to plaque accumulation for 1 month. One week after to remove the cronification devices, the defects were submitted to treatments. All treatments with PRP were located at the same side. Intrabony and class II furcation defects were randomly assigned to: Control (C); BG; PRP and PRP+BG, and PRP+BG+GTR and BG+GTR, respectively. Dogs were sacrificed 90 days after the surgeries and the blocks containing the experimental specimens were processed for histological analysis. No statistically significant differences were observed in all parameters for the treatment of intrabony defects. The extension of total epithelium (sulcular and junctional epithelium) was 2.24 ??0.58 mm, 1.94 ± ?0.37 mm, 1.97 ± ?0.37 mm and 1.81 ± ?0.61 mm for, Control, BG, PRP and PRP+BG, respectively. The new connective tissue adjacent to the root without cementum formation was 0.90 ± ?0.28 mm, 0.84 ± ?0.41 mm, 1.07 ± ?0.27 mm and 1.15 ± ?0.32 mm, respectively. The extension of new cementum was 2.63 ± ?0.70 mm, 2.56 ± ?0.36 mm, 2.37 ± ?0.38 mm and 3.10 ??0.47 mm, respectively. The length of new bone was 4.77 ± ?0.44 mm, 4.64 ± ?0.68 mm, 4.67 ± ?0.46 mm and 4.84 ± ?0.42 mm, respectively. The percentage of bone filling was 47% on the control group, 50% with BG, 50% with PRP+BG and 53% with PRP. At the class II furcation, no statistically significant differences were observed in defect extension and new bone (p=0.29).The extension of new cementum was 9.64 ± ?1.53 mm and 11.00 ± ?1.05 mm (p=0.03) to GTR+BG and GTR+BG+PRP, respectively. Within the limits of this study, it can be concluded that PRP, BG and their association was not able to increase the amount of periodontal regeneration obtained to the treatment of 3-wall intrabony defects in dogs. However, it can be assumed that PRP promoted an increase of cementum regeneration when applied in association with BG and GTR for the treatment of class II furcation lesions in dogsDoutoradoPeriodontiaDoutor em Clínica Odontológic