Perturbations
Mostrando 1-12 de 710 artigos, teses e dissertações.
-
1. Hemodynamic outcome of different ventilation modes in laparoscopic surgery with exaggerated trendelenburg: a randomised controlled trial
Abstract Purpose: To compare hemodynamic effects of two different modes of ventilation (volumecontrolled and pressure-controlled volume guaranteed) in patients undergoing laparoscopic gynecology surgeries with exaggerated Trendelenburg position. Methods: Thirty patients undergoing laparoscopic gynecology operations were ventilated using either volume-contr
Brazilian Journal of Anesthesiology. Publicado em: 2022
-
2. Writing papers with an emphasis on structural geology and tectonics: advices and warnings
Abstract The objective of this short paper was to provide some advice on how to write a geoscience paper of international standard and to warn against some common pitfalls. It is focused on how to structure a paper and stresses the importance of building its contents around a well-defined problem. Furthermore, the importance of moving away from outdated and
Braz. J. Geol.. Publicado em: 13/01/2020
-
3. EXPERIMENTAL AND NUMERICAL ANALYSIS OF CHAOTIC ADVECTION AS AN EFFICIENT APPROACH TO MAXIMIZE HOMOGENEOUS LAMINAR MIXING IN A BATCH MIXER
Abstract In the present work, the impacts of effective parameters on the mixing of Stokes flows in a chaotic batch mixer are numerically and experimentally studied. The batch mixer consists of a container and two circular rotors where the rotors can rotate independently. To investigate the possibility of improving the mixing, the effect of non-constant speed
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
-
4. Anthropogenic impacts on aquatic bacteria: a perspective from the tropics
Resumo O bacterioplâncton compreende um grupo altamente diversificado de microrganismos, que são dominantes nos ecossistemas aquáticos e desempenham um papel central no funcionamento desses ecossistemas e nos ciclos biogeoquímicos. Devido às suas elevadas taxas de dispersão e de mudança na composição, bem como alta adaptabilidade e plasticidade, os
Acta Limnol. Bras.. Publicado em: 14/11/2019
-
5. Distribution and habitat preference of Ephemeroptera and Trichoptera in subtropical mountain streams: implications for monitoring and conservation
Abstract: The assessment of biotic-habitat relationships provides key information to predict biotic responses to perturbations and important tools for river management and monitoring. This study aimed to assess the spatial distribution of Ephemeroptera and Trichoptera in mountain streams of central Argentina. We evaluated the effect of seasonality and identi
An. Acad. Bras. Ciênc.. Publicado em: 14/10/2019
-
6. POSTURAL ADJUSTMENTS OF ACTIVE YOUTHS IN PERTURBATION AND DUAL-TASK CONDITIONS
RESUMO Introdução Componentes cognitivos são necessários para manter a postura nas perturbações externas. Porém, poucos estudos investigaram o controle postural quando perturbações externas são associadas à tarefa cognitiva concomitante (TD). Objetivo Analisar o comportamento dos ajustes reativos após perturbação com diferentes intensidades
Rev Bras Med Esporte. Publicado em: 07/10/2019
-
7. Midgut cells alteration in gamma-irradiated beetles (Blaps polycresta, Coleoptera: Tenebrionidae)
Resumo Este estudo foi conduzido para examinar o efeito da radiação gama em espécimes biológicos. Assim, nosso conceito é esclarecer que a exposição à dose acumulada de raios gama de 0,2 Gy (0,66 rad / seg. Dose) da fonte Cs137 induz perturbações celulares no epitélio do intestino médio da progênie F1 de Polycresta blaps, afetando a nutrição e
Braz. J. Biol.. Publicado em: 26/09/2019
-
8. Chemical composition of propolis extract and its effects on epirubicin-induced hepatotoxicity in rats
ABSTRACT Propolis is a natural substance, produced by honeybees from the resin of various plants. The purpose of this study was to determine the chemical composition and evaluate the hepatoprotective effect of ethyl acetate extract of propolis from Tigzirt, against the toxicity induced by epirubicin which is a anticancer agent, and belongs to the family of a
Rev. bras. farmacogn.. Publicado em: 26/08/2019
-
9. STATE ESTIMATION AND TRAJECTORY TRACKING CONTROL FOR A NONLINEAR AND MULTIVARIABLE BIOETHANOL PRODUCTION SYSTEM
ABSTRACT In this paper a controller is proposed based on linear algebra for a fed-batch bioethanol production process. It involves finding feed rate profiles (control actions obtained as a solution of a linear equations system) in order to make the system follow predefined concentration profiles. A neural network states estimation is designed in order to kno
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
-
10. An assessment of the factors determining rotifer assemblage in river-lake systems: the effects of seasonality and habitat
ABSTRACT Zooplankton exhibit several trends of variation in space and time, and these trends can be more evident in natural environments without anthropic perturbations. Examples of anthropic factors are climate change, eutrophication and construction of reservoirs. This study evaluated the influence of three factors - seasonality, type of environment and th
Zoologia (Curitiba). Publicado em: 06/06/2019
-
11. Research of the Photoelectric Tracking and Pointing Platform Based on the Servo Control System
ABSTRACT: To improve the speed and accuracy of the photoelectric tracking and pointing platform stable tracking, we took the three-axis photoelectric tracking platform, of which the coupling among the rings is ignored, as the research object. Considering the effects of various disturbances, the stable tracking double closed-loop servo control system was buil
J. Aerosp. Technol. Manag.. Publicado em: 18/03/2019
-
12. Research on Sliding Mode Method about Three-Dimensional Integrated Guidance and Control for Air-to-Ground Missile
ABSTRACT Based on adaptive sliding mode-control and back-stepping design method, an integrated guidance and control method with less calculation is proposed, which is designed for air-to-ground missile during the terminal course in three-dimensional space. The model of the control system with nonlinear and coupling is simplified, then the integrated guidance
J. Aerosp. Technol. Manag.. Publicado em: 14/01/2019