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Adsorption of yttrium(Y^(3+)) and concentration of rare earth elements from phosphogypsum using chitin and chitin aerogel

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Journal of Rare Earths 2024年第4期42卷 775-782页

作者： Glaydson s.dos Reis Diana Pinto sabrina F.Lütke Eder C.Lima Luis F.O.silva irineu a.s.de brum Guilherme L.Dotto department of Forest Biomaterials and Technology Biomass Technology Centre Swedish University of Agricultural SciencesUmeaE13Swedn Universidad de La Costa Calle 58#55-66080002BarranquillaAtlanticoColombia Research Group on Adsorptive and Catalytic Process Engineering(ENGEPAC) Federal University of Santa MariaAv.Roraima100079705900Santa MariaRSBrazil Institute of Chemistry Federal University of Rio Grande do Sul90040060Porto AlegreBrazil

Chitin powder and chitin-aerogel were prepared from shrimp wastes and used to uptake Y^(3+)from aqueous solutions and concentrate this rare earth element from phosphogypsum(PG).Chitin aerogel displays a specific surface area of 945 m^(2)/g,while chitin powder is 3.6 m^(2)/g,which largely influences its adsorption *** the adsorption in synthetic solutions,the effect of pH on Y^(3+)removal is strong for chitin powder *** contrast,no big pH influence was detected for chitin *** interactions and chelation can highlight the proposed mechanism of Y^(3+)on chitin adsorbents for the powder and ***,in addition to these interactions,pore filling/pore diffusion is the main mechanism of Y^(3+)removal in the chitin *** aerogel is efficient in concentrating 8 times the Y^(3+)from PG,a very complex *** complex chitin aerogel-Y^(3+)can be a secondary source of rare earth elements for other applications.

关键词： Rare earths sustainable material Chitin powder Chitin porous aerogel Yttrium adsorption and recovery

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A Vulnerability Assessment Framework for Cultural Heritage sites:The Case of the Roman Ruins of Tróia

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International Journal of Disaster Risk science 2023年第1期14卷 26-40页

作者： Marvin Ravan Maria João Revez Inês Vaz Pinto Patrícia brum Joern Birkmann Institute of spatial and Regional Planning(IREUs) University of Stuttgart70569StuttgartGermany Nova Conservação S.A1200-872LisbonPortugal Troia Resort 7570-789CarvalhalGDLPortugal

This article contributes to developing an indicator-based vulnerability assessment framework for cultural heritage *** provides a vulnerability index for heritage sites potentially exposed to multiple hazards,including sudden-onset and slow-onset hazards,while considering climate change *** determining particular criteria and indicators,the Cultural Heritage Vulnerability Index incorporates structural and non-structural factors of the heritage site and its local and national *** assessment procedure was applied to the case of the Roman Ruins of Tróia in *** findings highlight those areas of sensitivity(e.g.,the existing deterioration patterns and types of foundation)and coping and adaptive capacities(e.g.,institutional setting and response plan)that significantly contribute to the level of vulnerability and *** results of vulnerability assessment will further enable determining priorities and developing risk mitigation and preparedness measures,in particular reducing structural sensitivity and promoting coping capacities.

关键词： Climate change Coping capacity Cultural heritage Risk assessment Roman Ruins of Tróia Vulnerability assessment

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Impact of Cluster Thinning on Quality of“Malbec”Grapes in Encruzilhada do sul-Rs

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American Journal of Plant sciences 2018年第3期9卷 495-506页

作者： Maria Inez Lopes Fernandes de Barros Dianini brum Frolech Letícia Leal de Mello Roberta Manica-Berto Marcelo Barbosa Malgarim Vagner Brasil Costa Paulo Mello-Farias departamento de Fitotecnia Universidade Federal de PelotasPelotasBrazil Tríade-Comunicacao Científica PelotasBrazil Universidade Federal do Pampa Campus Dom PedritoDom PedritoBrazil

The cultivar Malbec has been present’s good performance and quality in the south Half of Rio Grande do sul (Rs). In this context, we aimed to evaluate the quality of “Malbec” grapes in relation to the phytotechnical, physicochemical parameters and bioactive compounds under different intensities of cluster thinning in Encruzilhada do sul-Rs. The experiment was carried out in a commercial vineyard in the 2015/16 with the cultivar Malbec (Vitis vinifera L.) under rootstock “1103 Paulsen”, with spacing of 2.2 m between rows and 1.1 m between plants. The experimental design was of randomized complete blocks with five replications. The treatment factor tested was the cluster thinning, with four levels (0%, 10%, 30% and 50%), performed in véraison. The evaluated phytotechnical variables were cluster length, cluster fresh weight, berries fresh weight, number of berries, rachis fresh weight. Also what were determined are the number of clusters, production and Ravaz index. The physicochemical variables verified were pH, soluble solids (ss), titratable acidity (TA) and ss/TA ratio. The bioactive compounds were total polyphenols index and total anthocyanins. The appropriate balance between source and sink, by the Ravaz index, occurs to zero and 10% of cluster thinning. The “Malbec” grapes present an increase of the maturation index (ss/TA) at 50% of cluster thinning, due to the low titratable acidity at this level. The total polyphenols index has a larger increment when the plants are submitted to the cluster thinning of 10%, providing a larger quality to the fruits. At all the levels of cluster thinning tested, when compared to the control, there was a greater contribution of total anthocyanins in the berries.

关键词： Vitis vinifera Maturation Index Bioactive Compounds Ravaz Index Polyphenols

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Flotation of Brazilian and Colombian Coals Using a Negative Bias

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Journal of Chemistry and Chemical Engineering 2013年第2期7卷 170-174页

作者： irineu brum H. Villegas W. Banguero J. Guerrero C. sampaio J. Barraza Laboratorio de Processamento Mineral Centro de Tecnologia Universidad Federal Rio Grande do Sul Porto Alegre Brasil Escuela de Ingenierla Quimica Universidad del Valle Cali 25360 Colombia

Brazil and Colombia have large reserves of coal. Those reserves in Brazil are located predominantly in the south and the main reserves in Colombia are located in the north. despite the relative ease of exploitation, these resources have been underestimated as a source of energy. Currently, these countries are developing projects and partnerships aiming to qualify this mineral resource, adding quality to the final product of the processing plants. In this scenario, the processing of Brazilian and Colombian coal in flotation columns appears as a promising alternative, having been successful in mineral systems containing fine particles. The paper aims to study the overall process of column flotation for a specific Brazilian coal and a specific Colombian coal. The material used in this study consists of fine coal from Brazil (Copelmi) and Colombia (Cerrejon). The objective is to recover carbonaceous matter and reduce the ash and contaminants grade. The two coals were floated using a negative bias in a 5 cm diameter conventional flotation column of 5 m high. Flotation parameter investigated included air velocity in the range 0.6 to 1.5 cm/s. For all runs, a constant negative bias of -0.25 cm/s and a pulp concentration of 8% w/w were used. For Cerrejon coal, 300 g/ton of frother and 907 g/ton of collector was used, whereas for Copelmi coal, 600 g/ton of frother and 1,815 g/ton of collector was employed. The frother was a commercial Aerofroth 65 (AF65), whereas the collector was Kerosene. For the Colombian coal, in general, yield, organic recovery, ash recovery and water recovery decreased with the increasing air rate. However, for Brazilian coal the air rate had no significant effect. For Colombian coal, the highest yield (60% w/w) and organic recovery (69% w/w) were obtained at the lowest air rate (0.6 cm/s).

关键词：哥伦比亚浮选柱负偏压巴西煤用煤炭储量矿产资源起泡剂

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人体子宫肌层和平滑肌瘤组织中胰岛素受体酪氨酸激酶活性与底物1(IRs-1)的表达

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世界核心医学期刊文摘（妇产科学分册） 2006年第3期2卷 28-29页

作者： Orcy R.B. brum I. Da silva R.s.M. E. Capp 柳蕴 department of Physiology Núcleo Gerar de Reproduo Humana Hospital Moinhos de Vento Porto Alegre Brazil

Background: Uterine leiomyomas are the commonest tumors of the genital tract. Growth factors seem to be implicated in the development of leiomyoma. Objective: To determine the insulin receptor (IR) tyrosine kinase activity-phosphorylation of exogenous substrate poly(Glu 4: Tyr 1)-and insulin receptor substrate 1 expression in normal myometrium and leiomyoma. study design: The study group consisted of 12 women with leiomyoma undergoing routine hysterectomy. samples of leiomyoma and adjacent normal myometrium were obtained at the time of operation. Plasma membrane fractions were prepared and samples were incubated with and without insulin and incubated with exogenous substrate poly(Glu 4: Tyr 1). IRs-1 expression was studied in the whole lysate via Western blotting using specific antibodies. Data were analyzed using student’s t test. Results: The phosphorylation of the exogenous substrate poly(Glu 4: Tyr 1) in myometrium (1.566 ±0.177) and in leiomyoma (1.98 ±0.612) were similar (P = 0.774). The IRs-1 levels in myometrium(0.190±0.022) and in leiomyoma (0.226 ±0.022) were not different (P = 0.184). Conclusions: There was no difference in IR tyrosine kinase activity (phosphoryla-tion of exogenous substrate) and IRs-1 expression between normal myometrium and leiomyomata. Other steps in the insulin signaling cascade require further study to investigate the role of insulin receptor in leiomyomata.

关键词：平滑肌瘤 IRs-1 子宫肌层女性生殖系统子宫切除术溶胞产物特异抗体胰岛素信号生长因子

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