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1.
Materials (Basel) ; 17(16)2024 Aug 11.
Artigo em Inglês | MEDLINE | ID: mdl-39203174

RESUMO

Corrosion is an inevitable and persistent issue that affects various metallic infrastructures, leading to significant economic losses and safety concerns, particularly in areas near or in contact with saline solutions such as seawater. Green corrosion inhibitors are compounds derived from natural sources that are biodegradable in various environments, offering a promising alternative to their conventional counterparts. Despite their potential, green corrosion inhibitors still face several limitations and challenges when exposed to NaCl environments. This comprehensive review delves into these limitations and associated challenges, shedding light on the progress made in addressing these issues and potential future developments as tools in corrosion management. Explicitly the following aspects are covered: (1) attributes of corrosion inhibitors, (2) general corrosion mechanism, (3) mechanism of corrosion inhibition in NaCl, (4) typical electrochemical and surface characterization techniques, (5) theoretical simulations by Density Functional Theory, and (6) corrosion testing standards and general guidelines for corrosion inhibitor selection. This review is expected to advance the knowledge of green corrosion inhibitors and promote further research and applications.

2.
Materials (Basel) ; 17(16)2024 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-39203231

RESUMO

Solar thermal plants typically undergo trough operational cycles spanning between 20 and 25 years, highlighting the critical need for accurate assessments of long-term component evolution. Among these components, the heat storage media (molten salt) is crucial in plant design, as it significantly influences both the thermophysical properties of the working fluid and the corrosion of the steel components in thermal storage systems. Our research focused on evaluating the long-term effects of operating a low-melting-point ternary mixture consisting of 30 wt% LiNO3, 57 wt% KNO3, and 13 wt% NaNO3. The ternary mixture exhibited a melting point of 129 °C and thermal stability above 550 °C. Over 15,000 h, the heat capacity decreased from 1.794 to 1.409 J/g °C. Additionally, saline components such as CaCO3 and MgCO3, as well as lithium oxides (LiO and LiO2), were detected due to the separation of the ternary mixture. A 30,000 h exposure resulted in the formation of Fe2O3 and the presence of Cl, indicating prolonged interaction with the marine environment. This investigation highlights the necessity of analyzing properties under actual operating conditions to accurately predict the lifespan and select the appropriate materials for molten salt-based thermal storage systems.

3.
Plants (Basel) ; 12(23)2023 Nov 29.
Artigo em Inglês | MEDLINE | ID: mdl-38068652

RESUMO

Excess energy derived from photosynthesis can be used in plant microbial fuel cell (PMFC) systems as a sustainable alternative for the generation of electricity. In this study, the in situ performance of CAM (Crassulacean acid metabolism) plants in Calama, in the Atacama Desert, was evaluated for energy recovery using PMFCs with stainless steel AISI 316L and Cu as electrodes. The plant species evaluated included Aloe perfoliata, Cereus jamacaru, Austrocylindropuntia subulata, Agave potatorum, Aloe arborescens, Malephora crocea, and Kalanchoe daigremontiana. Among the plant species, Kalanchoe daigremontiana demonstrated significant potential as an in situ PMFC, showing a maximum cell potential of 0.248 V and a minimum of 0.139 V. In addition, the cumulative energy for recovery was about 9.4 mWh m-2 of the electrode. The use of CAM plants in PMFCs presents a novel approach for green energy generation, as these plants possess an inherent ability to adapt to arid environments and water-scarce areas such as the Atacama Desert climate.

4.
Av. cardiol ; 29(2): 165-178, jun. 2009. graf, tab
Artigo em Espanhol | LILACS | ID: lil-607882

RESUMO

El término hipertensión pulmonar comprende un grupo heterogéneo de condiciones con la capacidad común de generar incremento progresivo de la presión arterial pulmonar y cuyo resultado final puede derivar en dilatación ventricular derecha, falla cardíaca derecha y muerte. La hipertensión arterial pulmonar es una de sus formas y en las últimas décadas se ha producido un creciente interés sobre esta patología. En parte, mucho es debido al desarrollo y diponibilidad de tratamiento farmacológico e intervensiones específicas para una situación en la que, anteriormente, se contaba con limitados recursos terapéuticos y pronóstico invariablemente sombrío.


The term pulmonary hypertension encompasses a group of heterogeneous conditions with the common capacity to generate progressive increase in pulmonary arterial pressure for wicg the final result may derive in right heart dilatation, failure and death. Pulmonary arterial hypertension is one of its forms and in the last decadens a growing interest for this pathology has been encountered. This is largely due to the development and disposal of pharmacological treatment and specific interventions for a situation for which, in the past, limited resources were available and prognosis was invariably poor.


Assuntos
Humanos , Masculino , Feminino , Artéria Pulmonar/patologia , Hipertensão Pulmonar/patologia , Pneumopatias , Doenças Vasculares
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