Revisão bibliométrica de resíduos eletroeletrônicos (REEE) no banco de dados da Web of Science: produção de grupos e principais temas

The waste of electrical and electronic equipment (WEEE) has been one of the largest and growing wastes generated in the world, turning into a great challenge for humanity. The objective of the article was to map the scientific production on WEEE in the last decade (2012–2022), adopting a bibliometric analysis as a research method based on the survey of documents obtained from the Web of Science database. A total of 278 research and review articles were selected for analysis, with the use of Vosviewer and RStudio software. As a result, there was a significant increase in the number of publications in the last decade, with 86% of articles published between 2015 and 2022. In addition, it was possible to obtain the ranking of the most important authors, and the journals most used for publication of articles; it was found that the Asian, European and American continents had the greatest contribution. In the analysis of document coupling, combined with that of keywords, the main areas connected to WEEE currently researched were found: electronic waste recycling; environmental impacts; sustainability; circular economy; efficient e-waste management and e-waste recycling technologies; in addition, the keywords “e-waste” and “polybrominated diphenyl ethers” were the most frequent words used by the authors to represent the theme. It can be concluded that the theme has stood out over the last few years, with several publications providing managerial and political implications for researchers and professionals.Os resíduos de equipamentos elétricos e eletrônicos (REEE) têm sido dos maiores e crescentes resíduos gerados em todo o mundo, tornando-se um dos grandes desafios da humanidade. O objetivo do artigo foi mapear a produção cientifica sobre REEE na última década (2012–2022), adotando como método de pesquisa uma análise bibliométrica com base no levantamento de documentos obtidos da base de dados Web of Science. O total de 278 artigos de pesquisa e revisão foi selecionado para análise utilizando o software Vosviewer e RStudio. Obteve-se, como resultado, um aumento significativo nos números de publicações na última década, com 86% dos artigos publicados entre 2015 e 2022. Além disso, foi possível obter o ranking dos autores mais importantes e revistas mais utilizadas para publicação dos artigos; constatou-se que o continente asiático, europeu e americano foram os que tiveram maior contribuição. Na análise de acoplamento de documentos, combinada com a de palavras-chaves, constataram-se as principais áreas pesquisadas atualmente em relação ao REEE: reciclagem de lixo eletrônico; impactos ambientais; sustentabilidade; economia circular; gestão eficiente lixo eletrônico e tecnologias para reciclagem lixo eletrônico. além disso, as palavras-chave “e-waste” e “polybrominated diphenyl ethers” foram as com maior frequência utilizadas pelos autores para representar a temática. Pode-se concluir que a temática tem se destacado ao longo dos últimos anos com diversas publicações, fornecendo implicações gerenciais e políticas para pesquisadores e profissionais

Performance of goats and sheep grazing in Brazilian semi-arid scrubland supplemented with feed-blocks

The performance of four types of animals (two ovine and two caprine) was evaluated under grazing/browsing in Brazilian Caatinga scrubland, with ad libitum feed-block supplementation. Forty noncastrated males with an initial body weight of 19.3 ± 1.9 kg were used: 20 goats (10 Savanna x local undefined breed [LUB]) and 10 Boer x LUB and 20 sheep (10 Santa-Inês x local undefined hair sheep [LUHS]) breed and 10 Dorper x LUHS. The experimental design was completely randomized blocks with four treatments and ten replications. The genotypes were compared based on growth performance and carcass characteristics. The ½ Dorper sheep had a better productive performance than the ½ Santa-Inês sheep. For goats, the ½ Boer was superior to ½ Savanna in daily gain and final body weight (P>0.05). The ½ Dorper sheep gave the best carcass characteristics of all genotypes studied. In conclusion, the Dorper (sheep) and Boer (goats) are the genotypes recommended for crossing with local animals of undefined breeds to provide animals for finishing under grazing/browsing conditions in the Caatinga ecosystem of northeast Brazil with feed-block supplementation

Mapping of regional land-use/land-cover distribution according to soil types in the semiarid region of Pernambuco State, Brazil

Geotechnology is a tool with high potential for management, processing, analysis and automatic representation of georeferenced data, providing fast and accurate information about land cover with low cost. Therefore, this study aimed to quantify the land-cover/land-use area of three mesoregions of Pernambuco State, Brazil. We used cross-checking analysis of the land-cover/ land-use and soil type classification maps for Agreste, São Francisco, and Sertão mesoregions to obtain the most predominant soil-type/land-use classifications. The main classes observed in these mesoregions were: Dense Caatinga under Ustorthent (497,841 ha) and Utilsoils (291,984 ha. In the Agreste mesoregion was bare soil under Ustalfs (316,214 ha). Finally, in the sertão mesoregion the most important class was the Dense Caatinga under Ustorthent (497,841 ha) The results obtained in this study could be helpful as a tool to guide new modeling work in the semiarid region of Pernambuco State in Brazil

Cortes comerciales y característica de la canal de borregos y cabritos suplementados con bloques multinutricionales

 Objective. Aimed to identify the weight and yield of the commercial cuts, muscularity, and adiposity in the carcasses of sheep and goats grazing in the Caatinga supplemented with different sources of supplementations; these include feed-blocks. Material and methods. Sixty non-castrated males an initial average body weight of 18.63 ± 1.93 kg were used: 30 goats and 30 sheep all animals did not have a defined breed standard (WDBS). The experimental design used was entirely randomized (DIC), in factorial scheme 3x2 (three types of supplementation: mineral salt, MBs and MBs + buffel hay, and two species: sheep and goats) and 10 replications. Animals were raised in a rangeland grazing system in an area with vegetation characteristic of Caatinga ecosystem under three types of supplementation: 1: only mineral salt; 2: Feed blocks (MBs); and 3: MBs + buffel hay There were measured the weight, yield and the components of left half-part of carcass of lambs and kids. Results. The sheep were superior to goats in carcass conformation, loin-eye area, index of muscularity of the leg and compactness index of the leg while the goats were superior to sheep in leg muscles weight. Conclusions. Sheep and Goats, when fed with supplementation of pasture feeding blocks in the Caatinga ecosystem; Supplementation with mineral salt and Multinutritional Blocks with and without Buffel can be used to improve herds in the caatinga, with similar results among the three. Sheep show more adiposity of meat than goats, in contrast, goats have higher musculature than sheep when fed with feed blocks.Objetivo. Con el objetivo de identificar el peso y rendimiento de los cortes comerciales, musculatura y adiposidad en las canales de borregos y cabritos pastando en la Caatinga suplementado con diferentes fuentes de suplementos; Estos incluyen bloques de alimentación. Material y métodos. Se utilizaron 60 machos no castrados con un peso corporal medio inicial de 18,63 ± 1,93 kg: 30 borregos y 30 cabritos, todos los animales no tenían un estándar de raza definido (WDBS). El diseño experimental utilizado fue totalmente al azar (DIC), en esquema factorial 3x2 (tres tipos de suplementación: sal mineral, MBs y MBs + heno buffel, y dos especies: borregos y cabritos) y 10 repeticiones. Los animales fueron criados en un sistema de pastoreo de pastizales en un área con vegetación característica del ecosistema de Caatinga bajo tres tipos de suplementación: 1: sal mineral solamente; 2: Bloques de alimentación (MBs); Y 3: MBs + heno buffel Se midió el peso, el rendimiento y los componentes de la mitad izquierda de la carcasa de corderos y cabritos. Resultados. Las cordeiros fueron superiores a las cabritos en conformación de carcasas, área de lomo, índice de musculatura de la pierna y índice de compacidad de la pierna mientras que las cabritos fueron superiores a las cordeiros en el peso de los músculos de las piernas. Conclusión. Cordeiros y cabritos, cuando se alimentan con suplementos de bloques de alimentación de pasto en el ecosistema de Caatinga; La suplementación con sal mineral y Bloques Multinutritivos con y sin Buffel puede ser utilizada para mejorar los rebaños en la caatinga, con resultados similares entre los tres. Las cordeiros muestran más adiposidad de carne que las cabritos, en contraste, las cabritos tienen mayor musculatura que las cordeiros cuando se alimentan con bloques de alimentación

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements