Results 51 to 60 of about 47,997 (240)

Horas variables, días de la semana y astronomía [PDF]

, 2014
Los días, los años y la sucesión de estaciones nos vienen dados por la naturaleza; las horas y las semanas son construcciones culturales. En la antigüedad greco-romana, la duración de las horas variaba con las estaciones, lo que desapareció hoy, pero ...
Gangui, Alejandro
core  

Generalized Chemical Model for Warm Dense Hydrogen: Ionization Potential Depression and Molecular Dissociation Shifts

Contributions to Plasma Physics, EarlyView.
ABSTRACT Warm dense matter (WDM) is a complex state, where quantum effects, thermal excitations, and strong interparticle correlations coexist. Understanding its microscopic composition and medium‐induced modifications of atomic and molecular properties is essential for planetary modeling, fusion research, and high‐energy‐density experiments.
L. T. Yerimbetova, Yu. V. Arkhipov, Ye. S. Mukhametkarimov, A. E. Davletov, I. M. Tkachenko   +4 more
wiley   +1 more source

Los dioses soberanos y los ríos en la religión indígena de la Hispania indoeuropea. [PDF]

, 2000
Sin ...
Olivares Pedreño, Juan Carlos
core   +1 more source

ZnO‐Coated Silicon Oxide Nano‐Anode: Synergistic Enhancement of Cycling and Thermal Stability of Lithium‐Ion Batteries

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Lithium‐ion battery anodes that maintain good performance and excellent stability under high temperature conditions. Silicon oxide (SiO) has great potential as a high‐capacity anode for lithium‐ion batteries, but its practical use is limited by excessive volume expansion (>200%) and rapid capacity fade, especially at high temperatures.
Keren Shi, Wende Yi, Weikang Su, Qiaowei Xiao, Ziyan Wang, Xiaoyu Li, Jingyang Mu, Wufei Tang, Zhihan Peng, Huiqin Yao   +9 more
wiley   +1 more source

Josep Comas Solà, va veure l'atmosfera de Tità? [PDF]

, 2009
In 1907 Josep Comas Solà, director of the Fabra Observatory in Barcelona, announced that he had seen a darkening on Saturn’s satellite Titan which made him think that this celestial body had an atmosphere.
Oliver, Josep M.
core   +1 more source

One‐Step Synthesis of Si–Graphene Heterostructures via in‐Flight Gas‐Phase Mixing for High‐Capacity Silicon‐Rich Anodes

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A one‐step gas‐phase synthesis directly assembles amorphous Si nanoparticles with few‐layer graphene heterostructures via in‐flight mixing. Compositions with only 15 wt.% FLG deliver ~2800 mAh g−1 (Si + FLG) at 0.05 C and retain ~1400 mAh g−1 after 100 cycles at a high cycling rate of 1 C, enabled by a percolated, strain‐buffering graphene network that
Muhammad Ali, Mukarram Ali, Yasaman Jarrahizadeh, Axel Lorke, Michael A. Pope, Hartmut Wiggers   +5 more
wiley   +1 more source

Evaluating Forecasts at Multiple Horizons: An Extension of the Diebold–Mariano Approach

Journal of Forecasting, EarlyView.
ABSTRACT Forecast accuracy tests are fundamental tools for comparing competing predictive models. The widely used Diebold–Mariano (DM) test assesses whether differences in forecast errors are statistically significant. However, its standard form is limited to pairwise comparisons at a single forecast horizon.
Andrew Grant, Matus Mrazik, Steve Satchell   +2 more
wiley   +1 more source

Resistance to Tobacco Etch Virus in Capsicum annuum: Inhibition of Virus RNA Accumulation

Molecular Plant-Microbe Interactions, 1997
Resistance to tobacco etch potyvirus (TEV) in Capsicum annuum cv. Dempsey gene eta . When Dempsey pepper plants were inoculated with either of two TEV isolates, virus did not accumulate in inoculated or noninoculated leaves. In contrast, each TEV isolate
C. Michael Deom, John F. Murphy, Onofre R. Paguio   +2 more
doaj   +1 more source

IAA : Información y actualidad astronómica (8) [PDF]

, 2002
Sumario : Investigación: Supercomputacion en Astrofísica.-- Evolución y ciclos de actividad en radiogalaxias..-- Ventana Abierta: Algunos apuntes sobre el programa «Ramón y Cajal».-- Charlas con… Francisco Anguita.-- Actualidad Científica: ¿Es el ...
Alberdi, Antxón, Alfaro, Emilio J., Arco, Mª Angeles, Lara, Lucas, Muñoz, Olga, Márquez, Isabel, Perea, Jaime, Romero, Mª Carmen, Vílchez Medina, José Manuel   +8 more
core  

Evidence From Microscopy and U–Pb Geochronology as a Clue to the Influence of the Cretaceous Magmatism in the Diagenesis of Pre‐Salt Carbonate Reservoirs in the Santos Basin (Brazil)

Geological Journal, EarlyView.
Carbonates from Santos Basin revealed U–Pb ages correlated with basalt ages (A), suggesting that they were formed during magmatic events. These events placed hot CO2 in the reservoir, which, when mixed with carbonate‐rich cold water (B), led to thermal convection, enabling the formation of the U contained in the carbonates.
Marco António Ruivo de Castro e Brito, Cristiano Leite Sombra, Davy Raeder Brandão, Cleverson Guizan Silva, Sidney Luiz de Matos Mello, Eugênio Vaz dos Santos Neto, Rui Jorge Fernandes Baptista, Ramsés Capilla, Luiz Antônio Pierantoni Gambôa   +8 more
wiley   +1 more source