An exact master equation for the system-reservoir dynamics under the strong coupling regime and non-Markovian dynamics

In this paper we present a method to derive an exact master equation for a bosonic system coupled to a set of other bosonic systems, which plays the role of the reservoir, under the strong coupling regime, i.e., without resorting to either the rotating-wave or secular approximations. Working with phase-space distribution functions, we verify that the dynamics are separated in the evolution of its center, which follows classical mechanics, and its shape, which becomes distorted. This is the generalization of a result by Glauber, who stated that coherent states remain coherent under certain circumstances, specifically when the rotating-wave approximation and a zero-temperature reservoir are used. We show that the counter-rotating terms generate fluctuations that distort the vacuum state, much the same as thermal fluctuations.Finally, we discuss conditions for non-Markovian dynamics

Rapid determination of food quality using steady state free precession sequences in TD-NMR spectroscopy.

bitstream/item/180768/1/Rapid-determination-of-food-quality-using-steady-state-free-precession-sequences-in-TD-NMR-spectroscopy..pd

Development of an Optoelectronic Sensor for Detecting and Classifying Fruit Fly (Diptera:,Tephritidae) for Use in Real-Time Intelligent Traps.

Fruit flies (Diptera: Tephritidae) cause losses to world fruit growing. For a fast and effective control of the pest, it is necessary to identify the species and their populations. Thus, we developed an infrared optoelectronic sensor using phototransistors to capture the signal of the partial occlusion of the infrared light caused by the beating of the fly wings. Laboratory experiments were conducted using the sensor to capture the wing beat signal of A. fraterculus and C. capitata. The captured signals were used to obtain the characteristics of the flies’ wing beats frequency and for a production of a dataset made available as one of the results of this work. For the passage detection, we developed the algorithm of detection of events of passage (PEDA) that uses the root mean square (RMS) value of a sliding window applied to the signal compared to a threshold value. We developed the algorithm of detection of events of passage (CAEC) that uses the techniques of autocorrelation and Fourier transform for the extraction of the characteristics of the wings’ beat signal. The results demonstrate that it is possible to use the sensor for the development of an intelligent trap with detection and classification in real time for A. fraterculus and C. capitata using the wing beat frequency obtained by the developed sensor

q- Deformed Boson Expansions

A deformed boson mapping of the Marumori type is derived for an underlying $su(2)$ algebra. As an example, we bosonize a pairing hamiltonian in a two level space, for which an exact treatment is possible. Comparisons are then made between the exact result, our q- deformed boson expansion and the usual non - deformed expansion.Comment: 8 pages plus 2 figures (available upon request

Enteric methane emissions by goats in grazing in caatinga.

Caatinga is an important food source for the animals of the semi-arid region, but the low quality forage at certain times of year limits animal performance and increases the emission of methane gas. Thus, the objective of this study was to evaluate the forage intake and emission of methane by goats fed grassland savanna during two periods of the year

Fortalecimento da ovinocultura de corte no Município de Dormentes, Alto Sertão de Pernambuco.

Publicado também na Revista Brasileira de Agroecologia, v. 4, n. 2, 2009

Desempenho produtivo de ovelhas Santa Inês-Bergamácia suplementadas com misturas múltiplas contendo diferentes teores de uréia.

Objetivou-se neste trabalho avaliar o efeito de crescentes teores de uréia no suplemento concentrado, fornecido durante 42 dias antes da estação de monta

Loop variables in the geometry of a rotating black string

In this paper we analyze in the Wilson loop context the parallel transport of vectors and spinors around a closed loop in the background space-time of a rotating black string in order to classify its global properties. We also examine particular closed orbits in this space-time and verify the Mandelstam relations.Comment: 14 pages, iopart styl

Role of bone morphogenetic proteins in follicle development.

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