Impactor
Mostrando 1-12 de 55 artigos, teses e dissertações.
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1. Evaluation of the effects of erythropoietin and interleukin-6 in rats submitted to acute spinal cord injury
OBJECTIVE: To evaluate the effects of interleukin-6 (IL-6) and erythropoietin (EPO) in experimental acute spinal cord injury (SCI) in rats. METHODS: Using standardized equipment, namely, a New York University (NYU) Impactor, a SCI was produced in 50 Wistar rats using a 10-g weight drop from a 12.5-mm height. The rats were divided into the following 5 group
Clinics. Publicado em: 19/08/2019
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2. Finite Element Simulation of Interlaminar and Intralaminar Damage in Laminated Composite Plates Subjected to Impact
Abstract Here In this study, the composite laminates subjected to transverse impact with consideration interlaminar and intralaminar damage based on Cohesive Zone Model (CZM) and Progressive Damage Model (PDM) are investigated by numerical analysis using ABAQUS commercial finite element code. The delamination in stacking ply with the same fiber orientation
Lat. Am. j. solids struct.. Publicado em: 02/07/2018
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3. Impact Damage Analysis with Stress Continuity Constraints Fulfilment at Damaged-Undamaged Regions and at Layer Interfaces
Abstract Low-velocity impacts have a relevant importance for safety of laminated and sandwich composite structures, because they are highly susceptible to damage. In this paper, a 3D cost effective zig-zag model is developed in order to efficiently simulate such impacts. It a priori fulfills the continuity of out-of-plane stresses at layer interfaces, the co
Lat. Am. j. solids struct.. Publicado em: 2017-08
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4. Human dental pulp stem cells transplantation combined with treadmill training in rats after traumatic spinal cord injury
Spinal cord injury (SCI) is a disabling condition resulting in deficits of sensory and motor functions, and has no effective treatment. Considering that protocols with stem cell transplantation and treadmill training have shown promising results, the present study evaluated the effectiveness of stem cells from human exfoliated deciduous teeth (SHEDs) transpl
Braz J Med Biol Res. Publicado em: 08/08/2016
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5. Effects of ganglioside G(M1) and erythropoietin on spinal cord lesions in rats: functional and histological evaluations
OBJECTIVE: To evaluate the functional and histological effects of ganglioside G(M1) and erythropoietin after experimental spinal cord contusion injury. METHODS: Fifty male Wistar rats underwent experimental spinal cord lesioning using an NYU-Impactor device and were randomly divided into the following groups, which received treatment intraperitoneally. The
Clinics. Publicado em: 2016-06
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6. A computerized system for the application of Basso, Beattie and Bresnahan scale in Wistar rats
OBJECTIVES: To develop and test a computer program to assist researchers in assigning scores in the application of the Basso, Beattie and Bresnahan (BBB) scale and to compare these scores when doing so in free, targeted and automated computer-assisted modes. METHOD: To test the program, the participants used the Impactor methodology recommended by the New Y
Acta ortop. bras.. Publicado em: 2015-08
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7. Low-velocity Impact Response of a Nanocomposite Beam Using an Analytical Model
AbstractLow-velocity impact of a nanocomposite beam made of glass/epoxy reinforced with multi-wall carbon nanotubes and clay nanoparticles is investigated in this study. Exerting modified rule of mixture (MROM), the mechanical properties of nanocomposite including matrix, nanoparticles or multi-wall carbon nanotubes (MWCNT), and fiber are attained. In order
Lat. Am. j. solids struct.. Publicado em: 2015-04
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8. Impact response of functionally graded conical shells
This paper presents low velocity impact response of functionally graded pretwisted conical shells. The modified Hertzian contact law which accounts for permanent indentation is utilized to compute the contact force and other impact parameter. The time dependent equations are solved by Newmark's time integration scheme. An eight noded isoparametric quadratic
Lat. Am. j. solids struct.. Publicado em: 2015-01
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9. Neuroprotective effect of epidural hypothermia after spinal cord lesion in rats
OBJECTIVES : To evaluate the neuroprotective effect of epidural hypothermia in rats subjected to experimental spinal cord lesion. METHODS: Wistar rats (n = 30) weighing 320-360 g were randomized to two groups (hypothermia and control) of 15 rats per group. A spinal cord lesion was induced by the standardized drop of a 10-g weight from a height of 2.5
Clinics. Publicado em: 2014-08
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10. Monossialogangliosídeo transdérmico com laser no tratamento de lesão medular espinal de ratos
OBJETIVOS: Avaliar os efeitos de monossialogangliosídeos (GM1) administrados com laser por via transdérmica na recuperação da lesão da medula espinal de ratos. MÉTODOS: Quarenta ratos Wistar machos foram submetidos a contusão da medula espinal usando NYU Impactor. No Grupo 1, os ratos receberam 0,2 ml de solução salina diária por via intraperitonea
Acta ortop. bras.. Publicado em: 2013-04
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11. Analytical and Mathematical Modeling and Optimization of Fiber Metal Laminates (FMLs) subjected to low-velocity impact via combined response surface regression and zero-One programming
This paper presents analytical and mathematical modeling and optimization of the dynamic behavior of the fiber metal laminates (FMLs) subjected to low-velocity impact. The deflection to thickness (w/h) ratio has been identified through the governing equations of the plate that are solved using the first-order shear deformation theory as well as the Fourier s
Lat. Am. j. solids struct.. Publicado em: 2013-03
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12. Avaliação da utilização de um programa computadorizado para aplicação da escala de Basso, Beattie e Bresnahan (BBB) em ratos Wistar / Evaluation of the use of a computer software for the application of the Basso, Beattie e Bresnahan (BBB) scale in Wistar rats
A escala de Basso, Beattie e Brenahan (BBB) serve para avaliação da recuperação locomotora em ratos com lesão medular nos níveis torácicos. É baseada em critérios observacionais da movimentação do animal durante a marcha e atribui uma pontuação de 0 a 21 segundo a gravidade da lesão neurológica. Menor pontuação, maior gravidade. Tal escala p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/2012