Oscillatory Models
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. PARAMETERS FOR MODELING PASSIVE SUSPENSIONS OF SPRAY BARS
ABSTRACT The uniformity and quality of spraying depend on the stability of the spray boom, defined as the suspension system between the boom and the machine chassis. This paper presents a procedure for improving the performance of passive spray bar suspensions through parameter adjustment. Two multibody dynamics models of a tractor sprayer set were developed
Eng. Agríc.. Publicado em: 2021-05
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2. Sismologia e Rotação ao Longo da Sequência Principal / Asteroseismology and Rotation in the Main Sequence
Asteroseismology provides a unique opportunity to probe the inner properties of stars through the study of stellar oscillations. These oscillations depend on the physics of the cavity where they are formed. However, the stellar rotation introduces an axis of symmetry and lifts the degeneracy of the frequencies, thus hindering the identification. The goal of
Publicado em: 2011
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3. Phenomenological analysis of elastic scattering reactions using different models
McIntyre and Frahn-Venter three-parameter models are used to analyze the experimental data of three elastic scattering reactions α+ 58Ni, α+ 116Sn and α+ 197Au at the same incident energy of 240MeV. The different α-scattering cases have the same number of minima and maxima in their oscillatory structures of angular distribution. The increase in the mass
Brazilian Journal of Physics. Publicado em: 2009-12
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4. O estresse físico modula a mecânica de tecido pulmonar periférico, a expressão de citocinas e o estresse oxidativo em cobaias com inflamação alérgica crônica / Physical stress modulates lung tissue mechanics, cytokines and oxidative stress activation in guinea pigs with chronic allergic inflammation
There are evidences showing that stress can worsen asthma symptoms, but the exact mechanisms that link them are not clarified, especially in the distal lung parenchyma. Recently, the importance of the lung parenchyma has been emphasized in the modulations of the functional alterations, inflammatory and remodeling that characterizes asthma. These alterations
Publicado em: 2009
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5. Modelagem e identificação de parâmetros hidrodinâmicos de um veículo robótico submarino. / Modelling and Identification of hydrodynamic parameters of an underwater robotic vehicle.
In this work, a procedure for experimental identification of hydrodynamic coefficients of unmanned underwater vehicles is presented. At first, the development of a testbed for research on dynamics, control, and navigation of underwater vehicles is presented. This experimental platform includes: 1) a open-frame semi-autonomous unmanned underwater vehicle name
Publicado em: 2008
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6. Efeitos de superfície nas propriedades térmicas e dinâmicas de filmes de cristais líquidos esméticos. / Surface effects on the thermal and dynamical proprieties of smectic liquid crystal filmes.
The thermal and dynamical properties of free-standing films are strongly dependent on the boundary conditions and the presence of an external field. Using distinct theoretical models and the dynamic light scattering experimental setup, we study the surface and external field effects on the relaxation dynamics, fluctuation-induced interaction energy, and phas
Publicado em: 2007
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7. Um sistema presa-predador com evasão mediada por feromônio de alarme / A predator-prey model with pursuit and evasion triggered by alarm pheromones
Pattern, structure and emergent collective properties are ubiquitous in systems with many units (alive or inanimated) coupled through nonlinear interactions. Within this context, the study of cooperative phenomena in population dynamics of ecological interest has attracted the attention of the mathematicians and physicists since Lotka and Volterra in the 192
Publicado em: 2006
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8. Caracterização das fases imediata e tardia da resposta inflamatória de tecido pulmonar periférico de cobaias sensibilizadas / Comparison of early and late responses to antigen of sensitized guinea pigs parenchymal lung strips
The peripheral lung parenchyma has been studied as a component of the asthmatic inflammatory response. During induced constriction, tissue resistance increases in different asthma models. Approximately 60% of the asthmatic patients show early and late responses. The late response is characterized by more severe airway obstruction. In the present study, we ev
Publicado em: 2006
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9. Analises reologicas e calorimetricas de sistemas-modelo de proteinas do leite adicionados de carragena e sacarose. / Rheological and Calorimetry Analysis of milk proteins systems-models with carrageenan and sucrose added.
Interactions among milk proteins-carrageenan-sucrose in aqueous medium were studied in systems at pH 6.7 and submitted to thermal treatment at 70ºC for 30 min. These interactions were studied by evaluation of rheological behavior under oscillatory and steady shear of biopolymers mixture and sucrose during and after gelation. The mechanical properties of gel
Publicado em: 2003
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10. Propriedades viscosas e viscoelasticas de soluções e geis de quitosana
The chitosan biopolymer has recently being appointed as an important source of matrices used as adsorbents in processes for the recovery and purification of bioproducts, with new applications in areas such as biotechnology. An important advantage is that chitin occurs naturally and is commonly found in crustacean shells. The flexibility exhibited by these ma
Publicado em: 2001
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11. Robust predictive control of a gasoline debutanizer column
This paper studies the application of Model Predictive Control to moderately nonlinear processes. The system used in this work is an industrial gasoline debutanizer column. The paper presents two new formulations of MPC: MMPC (Multi-Model Predictive Controller) and RSMPC (Robust Stable MPC). The approach is based on the concepts of Linear Matrix Inequalities
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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12. An oscillatory neuronal circuit generating a locomotory rhythm.
A quartet of interconnected interneurons whose periodic activity appears to generate the traveling body wave of the swimming leech has been identified on each side of segmental ganglia of the ventral nerve cord of Hirudo medicinalis. Theoretical analysis and electronic analog models of the identified intra- and interganglionic synaptic connections of the seg