Results 31 to 40 of about 458,073 (175)

La mecánica clásica como aproximación de la mecánica cuántica [PDF]

, 2009
En el mundo macroscópico, en el de éxito en forma simultánea. Durante mucho tiempo esto fue considerado como una evidencia de que la teoría de la mecánica cuántica era aplicable solamente al dominio de los fenómenos microscópicos, mientras que la ...
Laura, Roberto, Vanni, Leonardo
core  

Linking Density and Nanoscale Crystallinity to Hydration in Nafion PEMFC Membranes: Insights From Experiment and Molecular Dynamics Simulations

Small Structures, EarlyView.
Molecular dynamics and experimental analysis show that higher crystallinity in Nafion enhances molecular packing, thereby increasing effective density. A proposed model bridges experimental and molecular‐scale observations by quantitatively linking water uptake to density variations, offering a predictive framework for optimising hydration and ...
Mateja Jovanović, Nicolas Bernhard, Matthias Baldofski, Marcin Rybicki, Miljan Dašić, Igor Stanković   +5 more
wiley   +1 more source

¿Es [formula] igual a [formula] + [formula]?

Momento, 1995
En este artículo analizamos desde un punto de vista crítico una interpretación errónea de la derivada respecto al tiempo de la cantidad de movimiento lineal en la segunda ley de Newton, frecuentemente enseñada en los cursos elementales de Mecánica.
Eduardo Zalamea G., Roberto París E., Oscar Ocaña G., Jairo Arbey Rodríguez M.   +3 more
doaj  

Endurecimiento superficial de aceros y fundiciones mediante láser de Nd: YAG

Revista de Metalurgia, 2001
En el trabajo se presentan los resultados del tratamiento térmico superficial, con técnica láser, de superficies metálicas. Con el empleo de un láser de Nd:YAG se procedió al endurecimiento superficial de los aceros AISI 1045, W1, W112 y fundiciones de ...
R. Sagaró, H. Carvajal, J. S. Ceballos, R. Cabrera, J. Mascarell   +4 more
doaj   +1 more source

C19. Ventilação mecânica prolongada numa UCI respiratória

Revista Portuguesa de Pneumologia, 2003
Os autores tiveram como objectivo avaliar a ventilação mecânica prolongada (VMP) (³ 15 dias) tendo em consideração: - grupos de diagnóstico, gravidade e sobrevivência.De 1990 a 2002 todos os doentes submetidos a ventilação mecânica (VM) admitidos na nossa UCI foram incluídos.
Gabriela Brum, Ricardo Melo, João Valença, Joaquin Vizcaino, Filipe Monteiro, Pilar Cardim, António A. Bugalho de Almeida   +6 more
openaire   +1 more source

CORR‐DATA: A database of corrosion parameters measured on existing reinforced concrete structures for enhanced structural assessment

Structural Concrete, EarlyView.
Abstract The corrosion of reinforcing bars embedded in concrete strongly compromises structural performance over time. However, its detection and quantification remain challenging due to limited comprehensive knowledge of natural corrosion patterns in existing structures.
Elena Casprini, Leonardo Todisco, Severin Haefliger   +2 more
wiley   +1 more source

Comparación del conocimiento de física entre nivel medio superior y superior

Revista Digital Internacional de Psicología y Ciencia Social
La alfabetización científica se refiere al desarrollo de habilidades y competencias necesarias para conceptualizar los fenómenos naturales. Estos conocimientos ayudan a enfrentarse de manera efectiva a problemáticas cotidianas y pueden ser modificados ...
José Vladimir Ruiz Pérez, María Luisa Cepeda Islas, Eduardo Fernández Nava, Alexis Raziel Valdés Rodríguez   +3 more
doaj   +1 more source

Computational Spinning Model to Study Different Expressions Proposed in the Literature for the Elongational Viscosity Evaluation from Spinning Experimental Data [PDF]

, 2006
The relation between isothermal elongational flow and other flow kinematics, like shear flow, was of interest since the early stages of rheometry.
Deiber, Julio Alcides, Ottone, Mariel Lorena, Peirotti, Marta Beatriz   +2 more
core  

Non‐Destructive Inspection of TCPs Using Pulse‐Echo Ultrasound and X‐Ray Microcomputed Tomography Techniques

X-Ray Spectrometry, EarlyView.
ABSTRACT Thermoplastic composite pipes (TCPs) have potential applications in offshore oil and gas industries because of their strength, lack of corrosion, and flexibility. Designed for fluid transportation in high‐pressure and high‐temperature environments, manufacturing defects and operational loads can compromise their performance.
Marcella Grosso Lima, Ighor B. C. de Paula, Raquel Marques Cautivo, Cesar Giron Camerini, Marysilvia F. da Costa, Hector G. Kotik, Celio A. Costa, Alessandra S. Machado, Davi F. Oliveira, Ricardo T. Lopes, Gabriela Ribeiro Pereira   +10 more
wiley   +1 more source

Evidence of internal structure validity of the nursing outcome “Mechanical Ventilation Weaning Response: Adult (0412)” for critically ill COVID‐19 patients

International Journal of Nursing Knowledge, EarlyView.
Abstract Purpose To evaluate the evidence of internal structure validity of the nursing outcome (NO) “Mechanical Ventilation Weaning Response: Adult (0412)” of the NOs classification for critically ill COVID‐19 patients. Methods A methodological study focused on internal structural validation, part of a multicenter study, was carried out in the ...
Aline Batista Maurício, Viviane Martins da Silva, Agueda Maria Ruiz Zimmer Cavalcante, Larissa Giardini Bruni, Sue Ann Moorhead, Elizabeth Swanson, Karen Dunn Lopez, Marcos Venícios de Oliveira Lopes, Alba Lucia Bottura Leite de Barros   +8 more
wiley   +1 more source