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  • Energy Research
  • 2021-2025
  • 13. Climate action
  • 7. Clean energy
  • University of North Texas

  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Xiaonan Lu; Lu Deng; orcid bw Sarah A. Saslow;
    Sarah A. Saslow
    ORCID
    Derived by OpenAIRE algorithms or harvested from 3rd party repositories

    Sarah A. Saslow in OpenAIRE
    Hongshen Liu; +7 Authors

    Vanadium-containing glasses have aroused interest in several fields such as electrodes for energy storage, semiconducting glasses, and nuclear waste disposal. The addition of V2O5, even in small amounts, can greatly alter the physical properties and chemical durability of glasses; however, the structural role of vanadium in these multicomponent glasses and the structural origins of these property changes are still poorly understood. We present a comprehensive study that integrates advanced characterizations and atomistic simulations to understand the composition-structure-property relationships of a series of vanadium-containing aluminoborosilicate glasses. UV-vis spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption near-edge structure (XANES) have been used to investigate the complex distribution of vanadium oxidation states as a function of composition in a series of six-component aluminoborosilicate glasses. High-energy X-ray diffraction and molecular dynamics simulations were performed to extract the detailed short- and medium-range atomistic structural information such as bond distance, coordination number, bond angle, and network connectivity, based on recently developed vanadium potential parameters. It was found that vanadium mainly exists in two oxidation states: V5+ and V4+, with the former being dominant (∼80% from XANES) in most compositions. V5+ ions were found to exist in 4-, 5-, and 6-fold coordination, while V4+ ions were mainly in 4-fold coordination. The percentage of 4-fold-coordinated boron and network connectivity initially increased with increasing V2O5 up to around 5 mol % but then decreased with higher V2O5 contents. The structural role of vanadium and the effect on glass structure and properties are discussed, providing insights into future studies of sophisticated structural descriptors to predict glass properties from composition and/or structure and aiding the formulation of borosilicate glasses for nuclear waste disposal and other applications.

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    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    The Journal of Physical Chemistry B
    Article . 2021 . Peer-reviewed
    License: STM Policy #29
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: orcid Jailos Lubinda;
    Jailos Lubinda
    ORCID
    Harvested from ORCID Public Data File

    Jailos Lubinda in OpenAIRE
    Ubydul Haque; Yaxin Bi; orcid Muhammad Yousaf Shad;
    Muhammad Yousaf Shad
    ORCID
    Harvested from ORCID Public Data File

    Muhammad Yousaf Shad in OpenAIRE
    +3 Authors

    In the last decade, many malaria-endemic countries, like Zambia, have achieved significant reductions in malaria incidence among children <5 years old but face ongoing challenges in achieving similar progress against malaria in older age groups. In parts of Zambia, changing climatic and environmental factors are among those suspectedly behind high malaria incidence. Changes and variations in these factors potentially interfere with intervention program effectiveness and alter the distribution and incidence patterns of malaria differentially between young children and the rest of the population. We used parametric and non-parametric statistics to model the effects of climatic and socio-demographic variables on age-specific malaria incidence vis-à-vis control interventions. Linear regressions, mixed models, and Mann-Kendall tests were implemented to explore trends, changes in trends, and regress malaria incidence against environmental and intervention variables. Our study shows that while climate parameters affect the whole population, their impacts are felt most by people aged ≥5 years. Climate variables influenced malaria substantially more than mosquito nets and indoor residual spraying interventions. We establish that climate parameters negatively impact malaria control efforts by exacerbating the transmission conditions via more conducive temperature and rainfall environments, which are augmented by cultural and socioeconomic exposure mechanisms. We argue that an intensified communications and education intervention strategy for behavioural change specifically targeted at ≥5 aged population where incidence rates are increasing, is urgently required and call for further malaria stratification among the ≥5 age groups in the routine collection, analysis and reporting of malaria mortality and incidence data.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Environmental Resear...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Environmental Research
    Article . 2021 . Peer-reviewed
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Environmental Resear...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Environmental Research
      Article . 2021 . Peer-reviewed
      License: Elsevier TDM
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    Authors: orcid Claudio S. Quilodrán;
    Claudio S. Quilodrán
    ORCID
    Harvested from ORCID Public Data File

    Claudio S. Quilodrán in OpenAIRE
    orcid Erik M. Sandvig;
    Erik M. Sandvig
    ORCID
    Harvested from ORCID Public Data File

    Erik M. Sandvig in OpenAIRE
    Francisco Aguirre; orcid Juan Rivero de Aguilar;
    Juan Rivero de Aguilar
    ORCID
    Harvested from ORCID Public Data File

    Juan Rivero de Aguilar in OpenAIRE
    +3 Authors

    AbstractA natural laboratory is a place supporting the conditions for hypothesis testing under non-anthropogenic settings. Located at the southern end of the Magellanic sub-Antarctic ecoregion in southwestern South America, the Cape Horn Biosphere Reserve (CHBR) has one of the most extreme rainfall gradients in the world. Subject to oceanic climate conditions, it is also characterized by moderate thermal fluctuations throughout the year. This makes it a unique natural laboratory for studying the effects of extreme rainfall variations on forest bird communities. Here, we monitor the bird species richness in the different forest types present in the CHBR. We found that species richness decreased with increasing precipitation, in which an increase of 100 mm in average annual precipitation showed about 1% decrease in species richness. Similar patterns were found among different forest types within the CHBR. These results provide a baseline to investigate the interactions between physical and biotic factors in a subpolar region that climatically contrasts with boreal forests, which is subject to continental climatic conditions. This research highlights the importance of ecological and ornithological long-term studies in the CHBR, which can contribute both to a higher resolution of the heterogeneity of climate changes in different regions of the world, and to orient conservation policies in the Magellanic sub-Antarctic ecoregion in the face of growing development pressures.

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    Biodiversity and Conservation
    Article . 2022 . Peer-reviewed
    License: CC BY
    Data sources: Crossref
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    Biodiversity and Conservation
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Universidad de Chile...arrow_drop_down
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      Biodiversity and Conservation
      Article . 2022 . Peer-reviewed
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    A Surface Energy Balance System (SEBS) has been installed collocated with each deployed Eddy Correlation Flux Measurement System (ECOR) at the Atmospheric Radiation Measurement (ARM) Climate Research Facility’s Southern Great Plains (SGP) site, North Slope of Alaska (NSA) site, first ARM Mobile Facility (AMF1), second ARM Mobile Facility (AMF2), and third ARM Mobile Facility (AMF3) at Oliktok Point (OLI). A SEBS was also deployed with the Tropical Western Pacific (TWP) site, before it was decommissioned. Data from these sites, including the retired TWP, are available in the ARM Data Archive. The SEBS consists of upwelling and downwelling solar and infrared radiometers within one net radiometer, a wetness sensor, and soil measurements. The SEBS measurements allow the comparison of ECOR sensible and latent heat fluxes with the energy balance determined from the SEBS and provide information on wetting of the sensors for data quality purposes.

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://digital.libr...arrow_drop_down
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    Authors: Huayun He; orcid Qi Hu;
    Qi Hu
    ORCID
    Harvested from ORCID Public Data File

    Qi Hu in OpenAIRE
    orcid Feifei Pan;
    Feifei Pan
    ORCID
    Harvested from ORCID Public Data File

    Feifei Pan in OpenAIRE
    Xuebiao Pan;

    Quantification of the trade-offs among greenhouse gas (GHG) emissions, yield, and farmers’ incomes is essential for proposing economic and environmental nitrogen (N) management strategies for optimizing agricultural production. A four-year (2017–2020) field experiment (including four treatments: basic N fertilizer treatment (BF), suitable utilization of fertilization (SU), emission reduction treatment (ER), and high fertilization (HF)) was conducted on maize (Zea mays L.) in the North China Plain. The Life Cycle Assessment (LCA) method was used in this study to quantify the GHG emissions and farmers’ incomes during the whole maize production process. The total GHG emissions of BF, SU, ER, and HF treatments in the process of maize production are 10,755.2, 12,908.7, 11,950.1, and 14,274.5 kg CO2-eq ha−1, respectively, of which the direct emissions account for 84.8%, 76.8%, 74.9%, and 71.0%, respectively. Adding inhibitors significantly reduced direct GHG emissions, and the N2O and CO2 emissions from the maize fields in the ER treatment decreased by 30.0% and 7.9% compared to those in the SU treatment. Insignificant differences in yield were found between the SU and ER treatments, indicating that adding fertilizer inhibitors did not affect farmers’ incomes while reducing GHG emissions. The yield for SU, ER, and HF treatments all significantly increased by 12.9–24.0%, 10.0–20.7%, and 2.1–17.4% compared to BF, respectively. In comparison with BF, both SU and ER significantly promoted agricultural net profit (ANP) by 16.6% and 12.2%, with mean ANP values of 3101.0 USD ha−1 and 2980.0 USD ha−1, respectively. Due to the high agricultural inputs, the ANP values in the HF treatment were 11.2%, 16.6%, and 12.4% lower than those in the SU treatment in 2018–2020. In conclusion, the combination of N fertilizer and inhibitors proved to be an environmentally friendly, high-profit, and low-emissions production technology while sustaining or even increasing maize yields in the North China Plain, which was conducive to achieving agricultural sustainability.

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    Plants
    Article . 2023 . Peer-reviewed
    License: CC BY
    Data sources: Crossref
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    Plants
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    Plants
    Article . 2023
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      Plants
      Article . 2023 . Peer-reviewed
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      Plants
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      Plants
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    Authors: orcid bw Angélica Valencia Torres;
    Angélica Valencia Torres
    ORCID
    Derived by OpenAIRE algorithms or harvested from 3rd party repositories

    Angélica Valencia Torres in OpenAIRE
    Chetan Tiwari; orcid Samuel F. Atkinson;
    Samuel F. Atkinson
    ORCID
    Harvested from ORCID Public Data File

    Samuel F. Atkinson in OpenAIRE

    The complex interaction between social, economic, and environmental processes coupled with transformations of the landscape primarily driven by urbanization have impacts on the access, availability, and distribution, of food. This has resulted in a global micronutrient deficiency and hunger. Given rapid urbanization and population growth, a more sustainable food system is necessary to feed more urban populations and provide adequate nutrition, especially in developing countries. Existing frameworks for modelling urban-environment interactions contain components related to food security, however, lack the specificity needed to evaluate the effects of land use decisions and agricultural production strategies on the health of local populations measured through metrics such as nutritional output. The research presented here proposes an urban nutrition (UN) extension to the previously published urban ecological economic system by developing a focused component that simulates scenarios of different degrees of urbanization and agricultural production techniques to improve the nutritional output of agricultural land, while considering the conservation of soil. This simulation approach was subsequently applied to the Toluca Metropolitan Zone, Mexico. Results showed that nutritional output would greatly increase when adding a variety of crops, even in scenarios where agricultural land is limited. The proposed extension can be used by decision makers worldwide to evaluate how landscape configurations and agricultural production systems affect the nutritional needs of the local population while fostering sustainable practices.

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    Sustainability
    Article . 2022 . Peer-reviewed
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    Sustainability
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      Sustainability
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    Authors: orcid bw László Nagy;
    László Nagy
    ORCID
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    László Nagy in OpenAIRE
    orcid bw Cleiton B. Eller;
    Cleiton B. Eller
    ORCID
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    Cleiton B. Eller in OpenAIRE
    orcid Lina M. Mercado;
    Lina M. Mercado
    ORCID
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    Lina M. Mercado in OpenAIRE
    orcid Francisco Cuesta;
    Francisco Cuesta
    ORCID
    Harvested from ORCID Public Data File

    Francisco Cuesta in OpenAIRE
    +16 Authors

    Contexte : La surveillance basée sur des placettes a fourni de nombreuses informations sur la diversité taxonomique et le stockage du carbone (C) dans les forêts tropicales de plaine du bassin amazonien. Cela a permis de mieux comprendre la relation entre la dynamique de la biomasse forestière des plaines et les facteurs du changement mondial, tels que le changement climatique et la concentration atmosphérique de CO 2. Beaucoup moins d'attention a été accordée aux écosystèmes montagneux d'Amérique du Sud qui comprennent les forêts montagnardes et la végétation alpine (páramo, puna, prairies des hautes Andes, zones humides et bruyère alpine).Ce complexe de végétation fournit une variété de services écosystémiques et forme un laboratoire naturel le long de divers gradients d'histoire/biogéographie physiographique, géologique et évolutive, et d'histoire de l'utilisation des terres.Images : Ici, nous passons en revue la compréhension empirique existante et les approches basées sur des modèles pour quantifier la contribution des écosystèmes de montagne à la fourniture de services écosystémiques dans le contexte socio-écologique en évolution rapide des montagnes sud-américaines.L' objectif de cet article est de définir une feuille de route générale pour la mise en œuvre de la végétation de montagne dans des modèles dynamiques de végétation mondiale (DGVM) à utiliser dans les modèles du système terrestre (ESM), sur la base de notre compréhension actuelle de leur structure et de leur fonction et de leur réactivité aux facteurs du changement global.Nous identifions également les processus de la limite des arbres, critiques dans les écosystèmes de montagne, comme des éléments manquants clés dans les DGVM/mes, et explorons ainsi en outre un modèle de limite des arbres.Méthodes : Un bilan de la disponibilité des données empiriques a été entrepris à partir de huit sites de recherche le long des Andes et dans le sud-est du Brésil.Parmi huit sites, deux (un au Venezuela et un au Brésil) avaient potentiellement des données climatiques, écologiques et écophysiologiques convenant au paramétrage d'une DGVM.Les données sur la biomasse des arbres étaient disponibles pour six sites.Une évaluation préliminaire de la DGVM du Joint UK Land Environment Simulator (JULES) a été réalisée pour identifier les lacunes dans les données disponibles et leurs impacts sur le paramétrage et l'étalonnage du modèle.En outre, l'élévation potentielle de la limite des arbres déterminée par le climat a été modélisée pour vérifier la DGVM quant à sa capacité à identifier la transition entre la forêt montagnarde et la végétation alpine.Résultats : Les résultats de l'évaluation du modèle de surface terrestre JULES ont identifié les processus clés suivants dans les forêts montagnardes : diminution liée à la température de la production primaire nette, respiration et allocation à la biomasse aérienne et augmentation des stocks de C dans le sol avec l'altitude.Il y avait un accord variable entre la biomasse simulée et celles dérivées des mesures sur le terrain via des équations allométriques.Conclusions : Nous avons identifié des écarts majeurs entre la disponibilité des données et les besoins de modélisation basée sur les processus de la végétation de montagne sud-américaine et de sa dynamique dans les DGVM.Pour combler cet écart, nous proposons un réseau transdisciplinaire, composé de membres des communautés théoriques/de modélisation et scientifiques empiriques, pour étudier la dynamique naturelle des écosystèmes de montagne et leurs réponses aux facteurs de changement mondiaux au niveau local, régional et continental, dans un cadre de système socio-écologique.Les travaux présentés ici constituent la base de la conception de la collecte de données à partir des mesures sur le terrain et des stations de surveillance instrumentales pour paramétrer et vérifier les DGVM.Le réseau est conçu pour collaborer et compléter les recherches à long terme existantes Antecedentes: El monitoreo basado en parcelas ha arrojado mucha información sobre la diversidad taxonómica y el almacenamiento de carbono (C) en los bosques tropicales de tierras bajas de la cuenca amazónica. Esto ha resultado en una mejor comprensión de la relación entre la dinámica de la biomasa forestal de las tierras bajas y los impulsores del cambio global, como el cambio climático y la concentración atmosférica de CO 2. Se ha prestado mucha menos atención a los ecosistemas de montaña de América del Sur que comprenden bosques montanos y vegetación alpina (páramo, puna, pastizales altoandinos, humedales y brezales alpinos).Este complejo de vegetación proporciona una variedad de servicios ecosistémicos y forma un laboratorio natural a lo largo de varios gradientes fisiográficos, geológicos y evolutivos de historia/biogeografía e historia del uso de la tierra. Objetivos: Aquí, revisamos la comprensión empírica existente y los enfoques basados en modelos para cuantificar la contribución de los ecosistemas de montaña a la prestación de servicios ecosistémicos en el entorno socioecológico rápidamente cambiante de las montañas sudamericanas. El objetivo de este documento es esbozar una amplia hoja de ruta para la implementación de la vegetación de montaña en modelos dinámicos de vegetación global (DGVM) para su uso en Modelos del Sistema Terrestre (ESM), basados en nuestra comprensión actual de su estructura y función y de su capacidad de respuesta a los impulsores del cambio global. También identificamos los procesos arbóreos, críticos en los ecosistemas de montaña, como elementos clave que faltan en las DGVM/ESM, y por lo tanto exploramos además un modelo arbóreo. Métodos: Se realizó un inventario de la disponibilidad de datos empíricos de ocho sitios de investigación a lo largo de los Andes y en el sureste de Brasil. De los ocho sitios, dos (uno en Venezuela y otro en Brasil) tenían algunos datos climáticos, ecológicos y ecofisiológicos potencialmente adecuado para parametrizar una DGVM. Se disponía de datos de biomasa de árboles para seis sitios. Se realizó una evaluación preliminar de la DGVM del Simulador Conjunto de Medio Ambiente Terrestre del Reino Unido (JULES) para identificar lagunas en los datos disponibles y sus impactos en la parametrización y calibración del modelo. Además, se modeló la posible elevación determinada por el clima de la línea de árboles para verificar la DGVM en cuanto a su capacidad para identificar la transición entre el bosque montano y la vegetación alpina. Resultados: Los resultados de la evaluación del modelo de superficie terrestre de JULES identificaron los siguientes procesos clave en los bosques montanos: disminución relacionada con la temperatura en la producción primaria neta, la respiración y la asignación a la biomasa sobre el suelo y aumento de las poblaciones de suelo C con elevación. Hubo un acuerdo variable entre la biomasa simulada y las derivadas de las mediciones de campo a través de ecuaciones alométricas. Conclusiones: Identificamos grandes brechas entre la disponibilidad de datos y las necesidades de modelado basado en procesos de la vegetación de montaña sudamericana y su dinámica en las DGVM. Para cerrar esta brecha, proponemos una red transdisciplinaria, compuesta por miembros de las comunidades científicas teóricas/de modelado y empíricas, para estudiar la dinámica natural de los ecosistemas de montaña y sus respuestas a los impulsores del cambio global a nivel local, regional y continental, dentro de un marco de sistema socioecológico. El trabajo presentado aquí forma la base para el diseño de la recopilación de datos a partir de mediciones de campo y estaciones de monitoreo instrumental para parametrizar y verificar las DGVM. La red está diseñada para colaborar y complementar la investigación existente a largo plazo. Background: Plot-based monitoring has yielded much information on the taxonomic diversity and carbon (C) storage in tropical lowland forests of the Amazon basin.This has resulted in an improved understanding of the relationship between lowland forest biomass dynamics and global change drivers, such as climate change and atmospheric CO 2 concentration.Much less attention has been paid to the mountain ecosystems of South America that comprise montane forests and alpine vegetation (páramo, puna, high Andean grasslands, wetlands, and alpine heath).This vegetation complex provides a variety of ecosystem services and forms a natural laboratory along various physiographic, geological and evolutionary history/biogeography, and land use history gradients.Aims: Here, we review existing empirical understanding and model-based approaches to quantify the contribution of mountain ecosystems to ecosystem service provision in the rapidly changing socioecological setting of the South American mountains.The objective of this paper is to outline a broad road map for the implementation of mountain vegetation into dynamic global vegetation models (DGVM) for use in Earth System Models (ESM), based on our current understanding of their structure and function and of their responsiveness to global change drivers.We also identify treeline processes, critical in mountain ecosystems, as key missing elements in DGVMs/ESMs, and thus explore in addition a treeline model.Methods: Stocktaking of the availability of empirical data was undertaken from eight research sites along the Andes and in south-eastern Brazil.Out of eight sites, two (one each in Venezuela and Brazil) had some climate, ecological and ecophysiological data potentially suitable to parametrise a DGVM.Tree biomass data were available for six sites.A preliminary assessment of the Joint UK Land Environment Simulator (JULES) DGVM was made to identify gaps in available data and their impacts on model parametrisation and calibration.Additionally, the potential climate-determined elevation of the treeline was modelled to check the DGVM for its ability to identify the transition between the montane forest and alpine vegetation.Results: Outcomes of the evaluation of the JULES land surface model identified the following key processes in montane forests: temperature-related decrease in net primary production, respiration, and allocation to above-ground biomass and increase in soil C stocks with elevation.There was a variable agreement between simulated biomass and those derived from field measurements via allometric equations.Conclusions: We identified major gaps between data availability and the needs for process-based modelling of South American mountain vegetation and its dynamics in DGVMs.To bridge this gap, we propose a transdisciplinary network, composed of members of the theoretical/modelling and empirical scientific communities, to study the natural dynamics of mountain ecosystems and their responses to global change drivers locally, regionally and at the continental scale, within a social-ecological system framework.The work presented here forms the basis for the design of data collection from field measurements and instrumental monitoring stations to parametrise and verify DGVMs.The network is designed to collaborate with and complement existing long-term research معلومات أساسية: أسفر الرصد القائم على قطعة الأرض عن الكثير من المعلومات حول التنوع التصنيفي وتخزين الكربون (C) في غابات الأراضي المنخفضة الاستوائية في حوض الأمازون. وقد أدى ذلك إلى فهم أفضل للعلاقة بين ديناميات الكتلة الحيوية للغابات المنخفضة ومحركات التغير العالمي، مثل تغير المناخ وتركيز ثاني أكسيد الكربون في الغلاف الجوي. وقد تم إيلاء اهتمام أقل بكثير للنظم الإيكولوجية الجبلية في أمريكا الجنوبية التي تشمل الغابات الجبلية والغطاء النباتي في جبال الألب (بارامو، بونا، الأراضي العشبية في أعالي الأنديز، الأراضي الرطبة، وصحة جبال الألب). يوفر مجمع الغطاء النباتي هذا مجموعة متنوعة من خدمات النظام الإيكولوجي ويشكل مختبرًا طبيعيًا على طول مختلف التاريخ الفيزيائي والجيولوجي والتطوري/الجغرافيا الحيوية، وتدرجات تاريخ استخدام الأراضي. الأهداف: نستعرض هنا الفهم التجريبي الحالي والنهج القائمة على النماذج لقياس مساهمة النظم الإيكولوجية الجبلية في توفير خدمات النظام الإيكولوجي في البيئة الاجتماعية والبيئية المتغيرة بسرعة لجبال أمريكا الجنوبية. الهدف من هذه الورقة هو تحديد خريطة طريق واسعة لتنفيذ الغطاء النباتي الجبلي في نماذج نباتية عالمية ديناميكية (DGVM) لاستخدامها في نماذج نظام الأرض (ESM)، بناءً على فهمنا الحالي من هيكلها ووظيفتها واستجابتها لمحركات التغير العالمي. كما نحدد عمليات خطوط الأشجار، الحرجة في النظم الإيكولوجية الجبلية، كعناصر رئيسية مفقودة في DGVMs/ESMs، وبالتالي نستكشف بالإضافة إلى ذلك نموذج خط الأشجار. الأساليب: تم إجراء جرد لتوافر البيانات التجريبية من ثمانية مواقع بحثية على طول جبال الأنديز وفي جنوب شرق البرازيل. من بين ثمانية مواقع، كان لدى موقعين (واحد في كل من فنزويلا والبرازيل) بعض البيانات المناخية والبيئية والفسيولوجية البيئية المحتملة مناسبة لتحديد معالم DGVM. كانت بيانات الكتلة الحيوية الثلاثية متاحة لستة مواقع. تم إجراء تقييم أولي لمحاكي بيئة الأراضي المشترك في المملكة المتحدة (JULES) DGVM لتحديد الثغرات في البيانات المتاحة وتأثيراتها على تحديد معالم النموذج ومعايرته. بالإضافة إلى ذلك، تم نمذجة الارتفاع المحتمل المحدد بالمناخ لخط الأشجار للتحقق من DGVM لقدرته على تحديد الانتقال بين الغابة الجبلية والغطاء النباتي في جبال الألب. النتائج: حددت نتائج تقييم نموذج سطح الأرض JULES العمليات الرئيسية التالية في الغابات الجبلية: الانخفاض المرتبط بدرجة الحرارة في صافي الإنتاج الأولي، والتنفس، والتخصيص للكتلة الحيوية فوق الأرض و زيادة مخزونات التربة C مع الارتفاع. كان هناك اتفاق متغير بين الكتلة الحيوية المحاكية وتلك المستمدة من القياسات الميدانية عبر المعادلات المتجانسة. الاستنتاجات: حددنا الفجوات الرئيسية بين توافر البيانات والاحتياجات إلى النمذجة القائمة على العمليات للغطاء النباتي الجبلي في أمريكا الجنوبية وديناميكياته في DGVM. لسد هذه الفجوة، نقترح شبكة متعددة التخصصات، تتألف من أعضاء المجتمعات العلمية النظرية/النمذجة والتجريبية، لدراسة الديناميكيات الطبيعية للنظم الإيكولوجية الجبلية واستجاباتها لمحركات التغيير العالمي محليًا وإقليميًا وعلى المستوى القاري، ضمن إطار النظام الاجتماعي الإيكولوجي. يشكل العمل المقدم هنا الأساس لتصميم جمع البيانات من القياسات الميدانية ومحطات المراقبة الآلية إلى بارامتير والتحقق من DGVM. تم تصميم الشبكة للتعاون مع البحوث القائمة طويلة الأجل واستكمالها

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    Plant Ecology & Diversity
    Article . 2023 . Peer-reviewed
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      Plant Ecology & Diversity
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    Authors: Kunjal Patel; Maryam Sadeghilaridjani; orcid Mayur Pole;
    Mayur Pole
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    Abstract Refractory high entropy alloys have recently attracted widespread attention due to their outstanding mechanical properties at elevated temperatures, making them appealing for concentrating solar power and nuclear energy applications. However, their molten salt corrosion behavior has not been reported, which is critical in evaluating their application merit. Here, the corrosion behavior of two recently developed refractory high entropy alloys, namely TaTiVWZr and HfTaTiVZr, was studied in molten 33NaCl–22KCl–45MgCl2 (wt. %) eutectic salt at 450 °C and 650 °C, using potentiodynamic polarization technique. The results were compared with benchmark alloys, namely 304 stainless steel (SS304) and Inconel 718 (IN718). TaTiVWZr refractory high entropy alloy exhibited an order of magnitude lower corrosion current density (Icorr = 0.7× 10-3 A cm-2) compared to SS304 (Icorr = 9.2 × 10-3 A cm-2) at the higher temperature of 650 °C. The corrosion rate of all the alloys increased with increase in temperature from 450 °C to 650 °C with the exception of TaTiVWZr. The TaTiVWZr alloy showed a corrosion rate of ~ 5 mm/year at 650 °C compared to ~ 110 mm/year for SS304. HfTaTiVZr and IN718 showed comparable corrosion rates in the range of ~ 40 mm/year at 650 °C. The high corrosion resistance of the two refractory high entropy alloys was attributed to a combination of three factors: (i) slower chlorination rate of refractory elements in the molten chloride salt environment driven by thermodynamics, (ii) formation of stable Ta–V and Ta–V–W based complex oxides on their surface, and (iii) Ti/TiCl2 and Zr/ZrCl2 redox couple formation which retarded the depletion of refractory elements. In contrast, the Cr-, Fe-, and Ni-based surface passivation oxides for SS304 and IN718 were less protective in the molten salt environment, particularly at the higher temperature of 650 °C.

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    Solar Energy Materials and Solar Cells
    Article . 2021 . Peer-reviewed
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      Solar Energy Materials and Solar Cells
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    Authors: Ubydul Haque; Ubydul Haque; Yaxin Bi; Jailos Lubinda; +2 Authors

    AbstractThe role of climate change on global malaria is often highlighted in World Health Organisation reports. We modelled a Zambian socio-environmental dataset from 2000 to 2016, against malaria trends and investigated the relationship of near-term environmental change with malaria incidence using Bayesian spatio-temporal, and negative binomial mixed regression models. We introduced the diurnal temperature range (DTR) as an alternative environmental measure to the widely used mean temperature. We found substantial sub-national near-term variations and significant associations with malaria incidence-trends. Significant spatio-temporal shifts in DTR/environmental predictors influenced malaria incidence-rates, even in areas with declining trends. We highlight the impact of seasonally sensitive DTR, especially in the first two quarters of the year and demonstrate how substantial investment in intervention programmes is negatively impacted by near-term climate change, most notably since 2010. We argue for targeted seasonally-sensitive malaria chemoprevention programmes.

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    Scientific Reports
    Article . 2021 . Peer-reviewed
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    Scientific Reports
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Scientific Reports
    Article . 2021
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Authors: Yucheng Zhou; Zhenhua Huang; Jingchen Xing; Keyan Yang; +4 Authors

    Abstract MEPCMs have drawn tremendous attention in TES fields. In this study, eutectic of CA and PA was encapsulated by PVC, and the novel MEPCM for TES applications was developed. Microcapsules were prepared by solvent evaporation method and examined using DSC, SEM, LPSA, FTIR, thermal cycling test and TGA. DSC results demonstrated that the phase change temperature of CA-PA eutectic decreased after microencapsulation. The most satisfied sample was the MEPCM with a shell-core ratio of 1:2, which melted at 17.1 °C with the latent heat of 92.1 J/g, the encapsulation ratio was 57.7%. SEM images and LPSA results showed that the prepared MEPCMs were consisted with micro-sized spheres. FTIR results confirmed that the PCM core was successfully encapsulated by the PVC shell, and no chemical reaction was found among the components. The prepared MEPCM showed an excellent thermal reliability after 500 times of thermal cycling. Microencapsulation enhanced the starting temperature of CA-PA eutectic thermal decomposition, and the novel MEPCM exhibited an excellent thermal stability at working temperature from TGA results. Consequently, MEPCM (1:2) was the optimal composition and had great potential for TES applications.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Journal of Energy St...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Journal of Energy Storage
    Article . 2021 . Peer-reviewed
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Journal of Energy St...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Journal of Energy Storage
      Article . 2021 . Peer-reviewed
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