Dinâmica de rotação de exoplanetas tipo terrestre com perturbação de terceiro corpo

In this work we study some topics of Celestial Mechanics, namely the problem of rigid body rotation and “spin-orbit” resonances. Emphasis is placed on the problem formulation and applications to some exoplanets with physical parameters (e.g. mass and radius) compatible with a terrestrial type constitution (e.g. rock) belonging to multiple planetary systems. The approach is both analytical and numerical. The analytical part consists of: i) the deduction of the equation of motion for the rotation problem of a spherical body with no symmetry, disturbed by a central body; ii) modeling the same problem by including a third-body in the planet-star system; iii) formulation of the concept of “spin-orbit” resonance in which the orbital period of the planet is an integer multiple of the rotation’s period. Topics of dynamical systems (e.g. equilibrium points, chaos, surface sections, etc.) will be included at this stage. In the numerical part simulations are performed with numerical models developed in the previous analytical section. As a first step we consider the orbit of the planet not perturbed by a third-body in the star-planet system. In this case the eccentricity and orbital semi-major axis of the planet are constants. Here the technique of surface sections, widely used in dynamical systems are applied. Next, we consider the action of a third body, developing a more realistic model for planetary rotation. The results in both cases are compared. Since the technique of disturbed surface sections is no longer applicable, we quantitatively evaluate the evolution of the characteristic angles of rotation (e.g. physical libration) by studying the evolution of individual orbits in the dynamically important regions of phase space, the latter obtained in the undisturbed case

Deslocamento de abomaso em vacas leiteiras

The genetic selection and the nutritional management to improve milk production make the dairy cattle more susceptible to the development of diseases, such as the abomasal displacement. It is the most frequently detected abomasal problem and it is the main cause of abdominal surgeries in dairy cattle. It is a multifactorial disease that occurs mainly in dairy cattle of high production during the puerperium. The abomasal displacement can occur to the right (DAD) or to the left (DAE), being the former more frequent than the latter. It is related to feeding management and occurs in animals that also have other diseases such as hypocalcaemia, ketosis and retained placenta. The disease causes economical losses in dairy cattle because of the costs with treatment, reduction of production, increase of the interval between the parturition, loss of body weight, early discard of the matrix and mortality. The most usual clinical signs are apathy, dehydration, low to serious ruminal timpanismo (gas accumulation in the abomasum) with reduction or lack of motility, liquid splash sound during the ballottement of the right flank, metallic sound to percussion, presence of a structure similar to distended viscera in the thorax or in the paralombar cavity on the side corresponding to the displacement, and liquefied, dark, scarce and fetid feces. The treatment is surgical, and the most used technique is the omentopexy on the left flank. The hidroelectrolytic correction must be performed and the concomitant diseases must be treated. The prophylaxis consists of adequate nutrition and pre-parturition management, besides reduction of stress and other diseases of the puerperium

Deslocamento de caracteres reprodutivos em Dendropsophus nanus (Anura, Hylidae) em sintopia e alopatria

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Deslocamento do abomaso à esquerda em bovinos leiteiros: da etiologia ao diagnóstico

A pecuária leiteira vem sofrendo ao longo dos últimos anos, constantes mudanças com o intuito de maximizar a produção. A contínua seleção para uma maior produção de leite em conjunto com o aumento da capacidade digestiva e profundidade corporal aumentou a susceptibilidade de ocorrência de várias enfermidades abomasais, como o deslocamento do abomaso. O deslocamento de abomaso é uma doença economicamente importante na bovinocultura leiteira e é definido como uma síndrome multifatorial onde há basicamente duas possibilidades de deslocamento, na primeira, a víscera pode deslocar-se à esquerda, causando o deslocamento do abomaso à esquerda e a segunda possibilidade, o órgão pode mover-se totalmente para o lado direito, provocando o deslocamento do abomaso à direita, sendo que o primeiro ocorre mais frequentemente. O período de maior ocorrência do deslocamento do abomaso à esquerda, se insere imediatamente ou até seis semanas após o parto. Assim, objetivou-se com essa revisão sistemática, elucidar as principais causas e fatores de risco, os variados sinais clínicos e os diversos métodos diagnósticos dessa enfermidade. Conclui-se que, é de extrema importância conhecer desde a causa, até o diagnóstico do deslocamento do abomaso à esquerda, para que auxilie os médicos veterinários a identificarem o problema na propriedade, direcioná-lo a um tratamento adequado e tomar medidas preventivas, eliminando os fatores de risco e consequentemente diminuindo a incidência do problema.

Filmes de 'CO' obtidos por deslocamento galvânico e suas propriedades magnéticas

Pós-graduação em Química - IQ

Uso de hialuronidato de sódio para tratamento de deslocamento anterior de disco articular com travamento bucal

Temporomandibular joint disorders causing limitation of mouth opening and pain may be related to the restriction of slipping or forward displacement of the mandibular condyle. Temporomandibluar arthrocentesis is the lavage of the joint and is regarded as a simple method that produces good results in patients with these symptoms. This article reports a case of disc displacement and closed lock in a patient who reported limited mouth opening and pain as the main symptoms. The treatment proposed was arthrocentesis and lavage, combining a corticosteroid with a sodium hyaluronate solution. It is concluded that arthrocentesis is a simple, efficient and barely invasive method for particular types of temporomandibular joint disorders and should be considered before opting for more invasive surgical procedures.

Reação postural de pacientes com doença de Parkinson e idosos sadios no teste de retropulsão instrumentado

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desenvolvimento de um durômetro portátil para madeiras com o uso de transdutor de deslocamento

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Eletrodinâmica quântica generalizada a la teoria de perturbação causal

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Teoria de perturbação causal para o modelo de Thirring como uma Teoria de Gauge

Pós-graduação em Física - IFT

Deslocamento de implante dentário para o seio maxilar: relato de caso

The residual alveolar ridges may be unfavorable for implant placement. The edentulous maxilla is often challenging for the oral surgeon because of the lack of bone as a consequence of alveolar ridge resorption and/or maxillary sinus pneumatization. Accidents or complications may occur when some of these issues are not being known. This article reports one case of implant displaced into the maxillary sinus, 27 days after sinus bone augmentation with simultaneous dental implant installation, causing moderated sinusitis symptoms. The implant was removed through oral cavity access to maxillary sinus.

Associações entre borboletas frugívoras em áreas de floresta com diferentes históricos de perturbação antrópica

Pós-graduação em Ecologia e Biodiversidade - IBRC

Qualidade da operação de semeadura de uma semeadora adubadora de plantio direto em função do tipo de martelete e velocidade de deslocamento

The current paper had as its objective to analyze the precision planter's operational performance according to five different displacement velocities and two types of jumpers for planting no-tillage corn. The utilized experimental delineation consisted of blocks at random with parcels subdivided in factorial scheme 2x5, two types of jumpers (4 and 5 staples) and five different displacement velocities (3.0; 4.5; 5.0; 7.0 e 9.0 km h-1) with four repetitions and by applying the average comparation test, as for the jumpers effects as for the displacement velocities effects, to the significance level of 5%. It was evaluated the data concerned to the longitudinal distribution of plants, average number of days for the emergence of seedlings, initial and final stand of plants, survival indices, mechanical harm on seeds, germination tests and grain production. It was also observed the planter displacement velocity effect of on variables as: longitudinal distribution of plants, average number of days for the emergence of seedlings, initial and final stand of plants, mechanical harm and yield. The survival indice of plants were high for all the studied velocities and jumpers. Among the studied velocities, the one of 5.0 km h-1 presented the highest yield to both types of jumpers.