Results 41 to 50 of about 469,071 (291)

Energy trends and the water-energy binomium for Brazil

open access: yesAnais da Academia Brasileira de Ciências, 2015
According to the demands of energy saving and carbon emission reduction, the water vs. energy nexus has become a major concern worldwide. Brazil occupies a singular position in the global energy system.
Gisele O. Da Rocha   +2 more
doaj   +1 more source

Rupicapra rupicapra (Mammalia) in the late pleistocene of Portugal [PDF]

open access: yes, 1989
A presença do género Rupicapra é demonstrada pela primeira vez em Portugal, com base em restos, dentários e do esqueleto, provenientes do Plistocénico superior (Solutrense) da gruta das Salemas.
Antunes, M. Telles, Cardoso, João Luís
core   +1 more source

Ideal Molecular Sieving with a Dense MOF for Helium Upgrading with Highly Diffusion Selective Mixed Matrix Membranes

open access: yesAdvanced Functional Materials, EarlyView.
The separation of Helium gas from natural gas is challenging but highly important. MIL‐116(Ga), a “non‐porous” metal–organic framework is used as a molecular sieve to separate He from CH4. Druse‐like MIL‐116(Ga) particles are integrated into polysulfone mixed matrix membranes.
Ayisha Komal   +10 more
wiley   +1 more source

Sources and formation of carbonaceous aerosols in Xi'an, China: primary emissions and secondary formation constrained by radiocarbon [PDF]

open access: yesAtmospheric Chemistry and Physics, 2019
To investigate the sources and formation mechanisms of carbonaceous aerosols, a major contributor to severe particulate air pollution, radiocarbon (14C) measurements were conducted on aerosols sampled from November 2015 to November 2016 in Xi'an, China ...
H. Ni   +8 more
doaj   +1 more source

A critical review of Texas, USA Fossil Park sites and implications for global geoheritage sites

open access: yesInternational Journal of Geoheritage and Parks, 2021
In the United States of America, fossil park sites provide visitors with sustainable fossil collecting opportunities as well as informal educational instruction via signage, brochures, or paleontological mentors.
Renee M. Clary
doaj   +1 more source

Energia, Geopolítica e a Política da Biosfera [PDF]

open access: yes, 2007
O quadro global da distribuição geográfica das reservas geológicas e da produção e consumo dos combustíveis fósseis, que são hoje de longe as principais fontes de energia a nível mundial, é cada vez mais propício à emergência e à recorrência de ...
Schwarz, Henrique
core  

The oldest Brazilian snakes from the cenomanian (Early Late Cretaceous) [PDF]

open access: yes, 2014
South American Mesozoic snake diversity is mostly represented by genera from the Cenomanian (Najash), Santonian- Campanian (Dinilysia), and Campanian-Maastrichtian (Alamitophis, Patagoniophis, Rionegrophis, and Australophis) of Patagonia, Argentina.
Albino, Adriana Maria   +3 more
core   +1 more source

Exploration and corrective measures of greenhouse gas emission from fossil fuel power stations for Bangladesh

open access: yes, 2020
Greenhouse gas emission is increasing alarmingly due to bulk electricity generation from fossil fuel such as coal, gas and oil with its limited stock.
A. K. Karmaker   +3 more
semanticscholar   +1 more source

Dual‐Mode Film Based on Highly Scattering Nanofibers and Upcycled Chips‐Bags for Year‐Round Thermal Management

open access: yesAdvanced Functional Materials, EarlyView.
Intelligent radiative cooling devices, adaptable to various weather conditions, have the potential for year‐round energy savings. This study introduces a sustainable dual‐mode film made from polycaprolactone nanofibers and upcycled chip bags for effective thermal management.
Qimeng Song   +4 more
wiley   +1 more source

A new angiosperm from the Crato Formation (Araripe Basin, Brazil) and comments on the Early Cretaceous Monocotyledons

open access: yesAnais da Academia Brasileira de Ciências, 2014
The Crato Formation paleoflora is one of the few equatorial floras of the Early Cretaceous. It is diverse, with many angiosperms, especially representatives of the clades magnoliids, monocotyledons and eudicots, which confirms the assumption that ...
FLAVIANA J. DE LIMA   +4 more
doaj   +1 more source

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