Vessel Stability
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. A Morphometric Analysis of Pathological Alterations in Hemorrhoidal Disease Versus Normal Controls: A Controlled Trial
ABSTRACT Objective Until today, the true pathophysiology of hemorrhoidal disease (HD) has not yet been unraveled. More and more evidence guides us towards the hypothesis that reduced connective tissue stability is associated with a higher incidence of hemorrhoids. The present study aimed to compare the quantity and quality of collagen, and vessel morphometr
Journal of Coloproctology (Rio de Janeiro). Publicado em: 2022
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2. Removal of lactobionic acid by electrodialysis
Lactobionic acid has a number of applications, such as in cosmetic formulations and detergents, as well as in the medical field, where it is used for the preservation of organs destined for transplantation. Previous studies have reported that a promising alternative procedure for the production of lactobionic acid is the biotechnological route, using permeab
Braz. J. Chem. Eng.. Publicado em: 2014-12
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3. Design of a passive nonlinear observer and a backstepping controller for surface vessels. / Projeto de um observador passivo não-linear e de um controlador backstepping para navios de superfície.
Dynamic Positioning Systems (DPS) are control systems used to maintain the vessel on a desired position or pre-defined path exclusively by means of active thrusters. A DPS can be separated into a set of dedicated modules with designated tasks. The most significant modules are the position and heading measurement systems, the state estimator, the controller a
Publicado em: 2010
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4. Controle por modos deslizantes aplicado a sistema de posicionamento dinâmico. / Sliding mode control applied to dynamic positioning systems.
This paper presents the application of the robust and nonlinear sliding mode control theory to the dynamic positioning systems for floating vessel, with experimental validation. The objective of the control system designed is to keep the vessel next a specific position (set-point) or follow a pre-defined trajectory (pathfollowing) through the action of prope
Publicado em: 2009
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5. Otimização das formas de cascos de deslocamento em relação a sua resistência ao avanço. / Displacement hull optimization regarding to ship wave resistance.
Due to an increasing necessity of building new vessels, whether by new orders or fleet renewal, the development of computational programs that could allow optimization of hull shapes is always helpful, saving project time and ensuring better performance at sea. Thus, the development of a synthesis procedure that allows obtaining shapes with better performanc
Publicado em: 2008
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6. Evaluation of asphalt mixtures produced with conventional peruvian asphalt binder PEN 60/70 and SBS polymer-modified type I 60/60 and PG 76-22 / Avaliação de misturas produzidas com ligantes asfálticos peruanos convencional PEN 60/70 e modificados por polímero SBS tipo I 60/60 e PG 76-22
The main goal of this work is the evaluation of the behavior of conventional peruvian asphalt binder AC PEN 60/70 and SBS polymer-modified asphalts I 60/60 and PG 76-22, when used in hot-mix asphalt (HMA), under both conditions with and without short-term aging. It aims also to establish the asphalt binder performance grade (PG), which is based on the weathe
Publicado em: 2007
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7. PROJETO INTEGRADO DE ESTABILIDADE DE UNIDADES FLUTUANTES / INTEGRATED STABILITY DESIGN OF NAVAL UNITS
Este trabalho está inserido em uma linha de pesquisa do Tecgraf/PUC-Rio de projeto de unidades flutuantes, tais como navios e plataformas. Nesta linha de pesquisa, é desenvolvido o programa gráfico Sstab, para análise e projeto de estabilidade estática de unidades flutuantes. Estabilidade de unidades flutuantes é um critério fundamental em um projeto
Publicado em: 2006
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8. Electron Cyclotron Emission in the TCABR Tokamak: An Experimental Study. / "Emissão Eletrociclotrônica no Tokamak TCABR: Um Estudo Experimental"
In this work, an experimental study of the Electron Cyclotron Emission (ECE) in the TCABR Tokamak, is described. An ECE sweeping heterodyne radiometer, operating in the 50-85 GHz frequency range, was installed, calibrated and used to detect ECE radiation in the second harmonic extraordinary mode from thermal plasma discharges. The noise temperature, amplitud
Publicado em: 2005
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9. Evaluation of procedures for agricultural samples preparation for multielemental determination by inductively coupled plasma optical emission spectrometry. / Avaliação de procedimentos para preparo de amostras agronômicas visando determinação multielementar por espectrometria de emissão ótica com plasma induzido.
Sample preparation was always considered a limiting factor for sample throughput in the analytical sequence due to its high time consumption and great probability for error insertion in the results. Therefore, purposes to generate lower analysis time and, mainly, to make sample handling a feasible process are readily wished. Two procedures for preparation of
Publicado em: 2004
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10. Multivariable robust control of an integrated nuclear power reactor
The design of the main control system of the CAREM nuclear power plant is presented. This plant is an inherently safe low-power nuclear reactor with natural convection on the primary coolant circuit and is self-pressurized with a steam dome on the top of the pressure vessel (PV). It is an integrated reactor as the whole primary coolant circuit is within the
Brazilian Journal of Chemical Engineering. Publicado em: 2002-12
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11. An Investigation into Mechanisms of Loss of Safe Basins in a 2 D.O.F. Nonlinear Oscillator
In this work we consider the transient stability of coupled motions of a 2 D.O.F. nonlinear oscillator that can represent, for example, the motions of a sea vessel under the action of trains of regular lateral waves. Instability is studied as the escape of the system from a safe potential well. The set of initial conditions in phase space that lead to accept
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-05
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12. Surgical Management of Entrapped Percutaneous Transluminal Coronary Angioplasty Hardware
Entrapment and fracture of coronary angioplasty hardware are rare complications of percutaneous coronary artery interventions; however, when such incidents occur, they frequently require surgical management. Percutaneous retrieval should be attempted before surgical retrieval unless hemodynamic stability is a problem. Surgical intervention should focus on gr