Results 61 to 70 of about 215,026 (234)

ESTRATEGIAS ACTIVAS DE APRENDIZAJE PARA CIENCIAS EXACTAS DEL BACHILLERATO GENERAL UNIFICADO (BGU).

open access: yesCiencia Digital, 2018
En la educación existen dificultades para la correcta transmisión del conocimiento, se siente que dentro del currículo se desarrolla la aplicación de estrategias activas para el aprendizaje   de Ciencias Exactas en el BGU, puesto que el maestro ecuatoriano está inmerso en algunos sectores dentro de la educación tradicional.
Nancy Guadalupe Morales Guevara   +3 more
openaire   +3 more sources

An In Situ Study of the Topochemical Transformation of Hybrid Layered Hydroxides Into Metallic Nanocomposites

open access: yesAdvanced Functional Materials, Volume 36, Issue 10, 2 February 2026.
Herein, the topochemical transformation of cobalt‐based layered hydroxides into nanocomposites is investigated using advanced real‐time characterization techniques combined with thermogravimetric analysis. The study reveals how interlayer carboxylic acids direct the transformation pathway, highlighting the role of carbon content and anion length. These
Camilo Jaramillo‐Hernández   +5 more
wiley   +1 more source

New insights into the chemistry of thiolate-protected palladium nanoparticles [PDF]

open access: yes, 2012
This paper establishes the chemical nature of Pd nanoparticles protected by alkanethiolates that were prepared through a ligand place-exchange approach and the two-phase method, first developed for Au nanoparticles by Brust and Schiffrin.
Amaya, Edgar Gilberto   +11 more
core   +2 more sources

Estado Vital de la Materia. Su origen, su evolución y su futuro.

open access: yesMedicina, 2001
<p>En este artlculo se hacen algunas observaciones sobre un estado de la materia (estado vital), propuesto para reemplazar el de materia viva, que se usa habitualmente.</p><p>La materia en estado vital se organiza por una fuerza interna,
J. Hernando Ordoñez
doaj  

The Major Soybean Allergen Gly m Bd 28K Induces Hypersensitivity Reactions in Mice Sensitized to Cow's Milk Proteins [PDF]

open access: yes, 2016
Reactions to soy have been reported in a proportion of patients with IgE-mediated cow’s milk allergy (CMA). In this work, we analyzed if Gly m Bd 28K/P28, one of the major soybean allergens, is a cross-reactive allergen with cow milk proteins (CMP).
Candreva, Ángela María   +5 more
core   +2 more sources

Ribcage Morphology in Native South American Populations From Different Altitudes: Insights From a Global Comparative Framework

open access: yesAmerican Journal of Human Biology, Volume 38, Issue 2, February 2026.
ABSTRACT Objectives Altitude shapes human morphology as highland populations must cope with cold and hypoxic environments. Although Andean highlanders have been proposed to exhibit larger and deeper ribcages, this idea is mainly based on research using disarticulated skeletal elements or non‐South American controls. The objective of this research is to
J. M. López‐Rey   +9 more
wiley   +1 more source

CC and NC pion production [PDF]

open access: yes, 2013
The disappearance searching experiments nu_mu ---> nu_x use charged current quasielastic (CCQE) reaction to detect an arriving neutrino and reconstruct its energy, while the CC1 pi^+ production can mimic the CCQE signal process.
Barbero, César Alberto   +2 more
core   +2 more sources

Revision of Manettia (Rubiaceae) in Paraguay

open access: yesNordic Journal of Botany, Volume 2026, Issue 2, February 2026.
Manettia Mutis is a Neotropical genus comprising over 100 species, many of which are only known from their original descriptions or, at most, from revisions dating back over 100 years. Recent review studies have remained unpublished for several years. Conventional taxonomic methods are followed.
Silvana Yasmin Gauto   +2 more
wiley   +1 more source

La guerra entre ciencias exactas y humanidades en el fin de siglo: el esc ndalo Sokal y una propuesta pacificadora

open access: yesCiencia Ergo Sum, 2000
Se aborda la discusión que se ha dado entre las ciencias exactas y humanas, a partir del escándalo provocado por el físico Alan Sokal, y se destaca la necesidad de desarrollar un proyecto científico técnico que unifique ciencias y humanidades.
Antonio Arellano Hernández
doaj  

On the boundedness of some nonlinear differential equation of second order [PDF]

open access: yes, 2015
In this paper we study the boundedness of the solutions of some nonlinear dofferential equation using as a key tool the Second Lyapunov method, i.e. find sufficient conditions under which the solutions of this equation are bounded.
Guzmán, Paulo Matias   +2 more
core  

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