Results 21 to 30 of about 285,916 (204)

Metodología del diseño de un fluido de perforación base agua en la cuenca oriente ecuatoriana

open access: yesFIGEMPA, 2022
Al no existir metodologías estandarizadas para el diseño del fluido de perforación en función de caracterización de la roca, revisión de fluidos de pozos de referencia, interacción roca-fluido, nuestro objetivo es obtener la mejor formulación en cada ...
Henry Paúl Romero-Cortez   +4 more
doaj   +1 more source

Universal restrictions to the conversion of heat into work derived from the analysis of the Nernst theorem as a uniform limit

open access: yes, 2003
We revisit the relationship between the Nernst theorem and the Kelvin-Planck statement of the second law. We propose that the exchange of entropy uniformly vanishes as the temperature goes to zero. The analysis of this assumption shows that is equivalent
  +27 more
core   +1 more source

Extração por fluido supercrítico [PDF]

open access: yesRevista Brasileira de Farmacognosia, 1996
The present study evaluated the antimicrobial activity of the 70% hydroalcoholic extract from Leonurus sibiricus l., Lamiaceae. The antimicrobial activity was determined throught the minimum inhibitory concentration (MIC). The extract of Leonurus sibiricus l. was active against Candida albicans, Staphylococcus aureus and Pseudomonas aeruginosa.
Maul, Aldo Adolar   +2 more
openaire   +3 more sources

INFLUENCIA DO USO DE CINZA DE BIOMASSA DA CANA-DE-AÇÚCAR NO COMPORTAMENTO CONCRETOS AUTO-ADENSÁVEIS

open access: yesHolos, 2010
O presente trabalho apresenta um estudo feito com concreto auto-adensável, com o objetivo de avaliar a influencia da incorporação de cinza de biomassa da cana-de-açúcar no comportamento no estado fluido do concreto auto-adensável.
Marcela Cortez Dantas   +5 more
doaj   +1 more source

La forma correcta de utilizar la ecuación de Bernoulli

open access: yesCampus, 2019
La ecuación de Bernoulli es un caso determinado de un problema del flujo de fluido. Se deben cumplir algunas restricciones para aplicar correctamente esta ecuación en particular.
Luis A. Arriola
doaj   +1 more source

Membrane Semi‐Permeability and Ion Selectivity in Chemiosmosis: Open Systems Volume Dependence of Electrolyte Chemistry

open access: yesAdvanced Materials Interfaces, EarlyView.
Very small cellular compartments can break electroneutrality and harness proton gradients without active transport structures, whereas larger volumes cannot, underscoring why life's critical energy processes are confined in microscopic spaces. ABSTRACT The effect of pH changes in external ionic solutions on liposomes entrapping non‐permeable weak acid ...
Josep M. Ribó   +4 more
wiley   +1 more source

Scholte waves on fluid-solid interfaces by means of an integral formulation

open access: yesGeofísica Internacional, 2013
El presente trabajo muestra la propagación de ondas de interfaz de Scholte en la frontera de un medio acústico (fluido) en contacto con un medio solido elástico, para una gama amplia de materiales sólidos.
Manuel Carbajal-Romero   +5 more
doaj   +1 more source

Previsão do comportamento termo-reológico de fluidos viscoelásticos durante o escoamento em canais de geometria complexa [PDF]

open access: yes, 2004
Pretende-se com o presente estudo aprofundar o conhecimento e apurar a sensibilidade necessária para lidar mais eficientemente com problemas reais, nomeadamente nas áreas de Extrusão e da Injecção.
Fernandes, Florbela P.
core  

Hydrogen Permeation in Polyethylene: Effect of Crystallinity on Gas Transport Coefficients at Different Temperatures

open access: yesJournal of Polymer Science, Volume 64, Issue 3, Page 608-621, 1 February 2026.
Correlation of H2 permeability in semicrystalline polymers used as liners in Type IV composite tanks, versus temperature and crystallinity. ABSTRACT Semicrystalline polymers such as high‐density polyethylene (HDPE) are increasingly adopted as liners in compressed hydrogen storage tanks, due to low weight, easy processing, and high durability, together ...
Lorenzo Merlonghi   +3 more
wiley   +1 more source

Estudo comparativo da imunização antitetânica com o uso do toxóide tetânico fluido e precipitado pelo alúmen

open access: yesRevista da Sociedade Brasileira de Medicina Tropical, 1970
Os autores fazem um estudo comparativo da imunização antitetânica em um grupo de crianças, utilizando toxóide fluido contendo 20 Lf/cm3 e toxóide precipitado pelo alúmen contendo 2 Lf/cm3.
Roched A. Seba   +2 more
doaj   +1 more source

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