Results 101 to 110 of about 131,894 (228)

Um novo podocnemídeo fóssil de grande porte da formação Solimões (mioceno-plioceno), Acre, Brasil e as relações filogenéticas entre os podocnemidae [PDF]

open access: yes, 2013
Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, 2013.A família Podocnemidae é representada hoje por oito espécies viventes distribuídas na América do Sul e em Madagascar.
Dumont Júnior, Marcos Vitor
core  

A AULA DE CAMPO NO MONUMENTO NATURAL DA FLORESTA FÓSSIL DO RIO POTI COMO FERRAMENTA DIDÁTICA PARA O ENSINO DE GEOGRAFIA FÍSICA [PDF]

open access: yes, 2020
A compreensão da dinâmica dos mais diversos elementos e proscessos físico-naturais presentes no espaço geográfico, numa escala temporal e espacial, é indubtável para a compreensão das paisagens.
Sobral, Ítalo José Pereira   +1 more
core   +1 more source

Controlled Lattice Distortion and Lattice‐Strain‐Engineered CoCuIr Alloy toward Preferential Chlorine Tolerant Direct Seawater Electrolysis

open access: yesAdvanced Science, EarlyView.
A lattice‐strain‐engineered Co0.28Cu0.67Ir0.05 trimetallic alloy nanoparticle electrocatalyst is rationally designed for efficient alkaline seawater electrolysis. Larger Ir atoms in the CoCu lattice modulate the local coordination environment, generating compressive lattice strain and highly active catalytic sites.
Ankur Kumar   +5 more
wiley   +1 more source

Co‐Ligand‐Induced Electronic Modulation Controls Substrate Adsorption and Selectivity in Biomass Electrooxidation

open access: yesAdvanced Science, EarlyView.
A molecular design strategy is reported that introduces distinct anionic co‐ligands into Cu‐based catalysts to modulate the electronic density of the metal center and, consequently, its interaction with both OHads and HMF. The work establishes co‐ligand engineering as an effective strategy for precise interfacial adsorption control in electrocatalysis,
Chen Gao   +6 more
wiley   +1 more source

A ASCENÇÃO DO COMBUSTÍVEL FÓSSIL: ASPECTOS TECNOLÓGICOS, SOCIAIS, ECONÔMICOS E AMBIENTAIS DA SUBSTITUIÇÃO DA LENHA PELO CARVÃO MINERAL

open access: yes, 2019
A lenha como combustível de maior utilização pela humanidade, foi sendo substituída pelo carvão mineral a partir do século XIII, devido a uma série de fatores.
Arentz Pereira, Carlos Augusto
core  

Ataxioceras: portrait

open access: yes, 2016
Mostra imagem de Ataxioceras. Este fóssil de Ataxioceras sp. pertence ao Jurássico Superior e foi encontrado na Alemanha.
Albes, Erich W.
core   +1 more source

Ab Initio Thermoelectric Transport Calculations of Alloyed Half‐Heuslers

open access: yesAdvanced Science, EarlyView.
The effect of alloying on the electronic transport of half‐Heusler thermoelectric materials is explored using a fully ab initio approach. A novel method is developed that combines calculations of alloyed supercells with Boltzmann transport, considering the full energy and momentum dependent scattering processes from first principles extracted ...
Ankit Kumar   +2 more
wiley   +1 more source

FLORESTA FÓSSIL DO RIO POTI EM TERESINA, PIAUÍ: PORQUE NÃO PRESERVAR?

open access: yes
O Parque Ambiental Floresta Fóssil do Rio Poti se constitui uma área de grande valor científico e potencial turístico e educativo, por ser uma das raras florestas fósseis do mundo com troncos vegetais fossilizados em posição de vida, datados de cerca de ...
Marcela Vitória Vasconcelos   +2 more
core   +1 more source

Circadian‐Inspired Hydrogel Moisture Electricity Generation

open access: yesAdvanced Science, EarlyView.
A circadian‐inspired hydrogel moisture‐electric generator enables sustainable electricity generation by autonomously current direction switching between daytime and nighttime. This reversible output is accompanied by inversion of the internal water gradient, which effectively reduce hydrogel fatigue and offers a new strategy for harvesting diurnal ...
Ziqi Li   +7 more
wiley   +1 more source

Mixed‐Valence Atomic‐Layer Iridium Patches Enhance Alkaline Hydrogen Evolution

open access: yesAdvanced Science, EarlyView.
Engineering iridium architectures on Cu3P nanowires reveals that atomic‐layer Ir patches form a mixed‐valence interfacial motif with an anisotropic electronic structure. This configuration balances water dissociation and hydrogen adsorption/desorption, delivering superior alkaline hydrogen evolution with a 27 mV overpotential and 1 A cm−2 operation in ...
Payam Ahmadian Koudakan   +7 more
wiley   +1 more source

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