bluuebunny/crossref_metadata_2025_split huggingface dataset:
ĐẶC ĐIỂM DINH DƯỠNG VÀ SINH TRƯỞNG CỦA CÁ NÂU Scatophagus argus (Linnaeus, 1776) PHÂN BỐ Ở ĐẦM PHÁ TAM GIANG
Authors: Huy Nguyễn Văn , Tuệ Lê Minh , An Lê Thị Thu , Xinh Huỳnh Tấn 
Published: August 2020

Mục đích của nghiên cứu này là xác định được đặc điểm dinh dưỡng; thành phần thức ăn tự nhiên; tương quan giữa chiều dài và khối lượng và yếu tố điều kiện của cá Nâu phân bố ở đầm phá Tam Giang. Tổng số 180 mẫu cá Nâu thu từ tháng 7/2018 đến tháng 6/2019 được chia thành 3 nhóm theo chiều dài toàn thân lần lượt là <8,5 cm; từ 8,5–14 cm và >14 cm. Kết quả phân tích ống tiêu hóa chỉ ra rằng, cá Nâu thay đổi đặc điểm dinh dưỡng theo giai đoạn phát triển trong vòng đời, nhóm cá có chiều dài <8,5 cm thành phần thức ăn là động vật chiếm ưu thế; cá ăn tạp khi chúng đạt kích thước từ 8,5–14 cm và thành phần thức ăn là thực vật chiếm ưu thế khi cá đạt kích thước >14cm. Cường độ bắt mồi ở nhóm cá có chiều dài 8,5–14 cm là cao nhất đến nhóm cá <8,5 cm và >14 cm. Thành phần thức ăn tự nhiên của cá Nâu gồm 20 loại đại diện cho thuộc 6 nhóm khác nhau (4 ngành tảo, 2 ngành động vật không xương sống và mùn bã hữu cơ). Trong đó, ngành Tảo Silic - Bacillariophyta chiếm ưu thế về thành phần. Phương trình tương quan giữa chiều dài và khối lượng của cá Nâu là W = 0,062 x L2,7446, có hệ số xác định R2 = 0,9686 cho thấy sự tăng trưởng về chiều dài và khối lượng của cá Nâu có mối tương quan rất chặt chẽ với nhau, giá trị b < 3 chứng tỏ đây là loài cá sinh trưởng đồng nhất; nghĩa là khi chiều dài tăng thì khối lượng của cá cũng tăng dần theo. Yếu tố điều kiện (K) thay đổi từ 2,97 đến 3,37 và tăng dần theo kích thước cơ thể của cá.
ABSTRACT
The objectives of this study aimed to determine feeding habits; and growth characteristics of spotted scat -Scatophagus argus in Tam Giang lagoon of Thua Thien Hue province. A total of 180 specimens were collected from July 2018 to June 2019 in Tam Giang lagoon area that was devided into three groups based on the length of fish including: <8,5 cm; from 8.5–14 cm and >14 cm. The analyzed results showed that the feeding habits of Scatophagus argus have been changed according to the development stages of life. Scatophagus argus is an omnivore as small size and has been changed into a herbivore with the increase in length. The group of 8.5 – 14 cm in length had the highest feeding intensity, followed by groups <8,5 cm and >14 cm. The analysis of the stomach of Scatophagus argus, containing 20 types of natural foods, belonged to 6 different groups (4 Phylum of algae, 2 Phylum of invertebrates, and detritus) in which Bacillariophyta was abundant in the number of species. The length-weight relationship equation of Scatophagus argus was W = 0,062 x L2,7446, with R2 = 0,9686 showed a high relationship in growth patterns of fish length and weight. The equation b value was lower than 3 indicated that Scatophagus argus showed the isometric growth patterns during the development of fish. Condition factor (K) has been changed from 2,97 to 3,37 with the increase in fish size groups.
Avaliação do potencial de geração de gás e óleo não convencional dos folhelhos negros da formação Irati na região de Goiás e Mato Grosso, Centro-Oeste do Brasil
Authors: Mabecua Fastudo Jorge , Tassinari Colombo Celso Gaeta , Pereira Egberto 
Published: August 2020

Esse artigo propõe-se a avaliar o potencial de geração de gás e óleo não convencional (shale gas e shale oil) dos folhelhos negros da Formação Irati na região de Goiás e Mato Grosso, Centro-Oeste do Brasil, através da caracterização de geoquímica orgânica dos folhelhos, determinação do potencial gerador e grau de maturação da matéria orgânica dos folhelhos. Os resultados da pesquisa mostram que os valores de COT variam de 0,04 a 3,52% com média de 1,31%, o que lhes confere um bom potencial gerador de hidrocarbonetos na área de estudo. Foram encontrados valores no pico S2 que variam de 5,13 a 63,13 mg HC/g de rocha para a maioria das amostras estudadas pela pirólise Rock - Eval, conferindo-lhes um bom a excelente potencial petrolífero. Os folhelhos apresentam querogênio do tipo I, II e IV, com predomínio do querogênio do tipo II e IV. Estudos de maturidade térmica da matéria orgânica (querogênio) com base nos valores de Tmax, IH, IP e Ro, indicam seu grau como imaturo (com baixo nível de conversão em hidrocarbonetos) a supermaturo (zona de gás seco). Amostras que alcançaram a janela de geração de gás seco não possuem potencial para geração de hidrocarbonetos, uma vez que apresentam querogênio do tipo IV, que evidencia baixo poder de preservação da matéria orgânica durante o intenso magmatismo ocorrido no Mesozóico (Jurássico/Cretáceo). A maioria das amostras analisadas apresentam bom potencial para shale gas e/ou shale oil, porém as condições de temperatura e pressão durante a diagênese não foram suficientes para a maturação da matéria orgânica nos folhelhos. Os procedimentos metodológicos aplicados para a realização do mesmo basearam-se na pesquisa bibliográfica; trabalho de campo e amostragem; análises laboratoriais; análise e discussão dos resultados.
A viabilidade de uso do lúdico nas aulas de língua inglesa
Authors: Pinheiro Rafael Pires , Da Silva Daniele Socorro Ribeiro 
Published: August 2020

<p align="justify"><span style="color: #000000;"><span style="font-family: 'Times New Roman', serif;"><span>Este trabalho visa discutir a viabilidade da utilização do lúdico nas aulas de inglês através de referenciais teóricos, a fim de promover uma maior compreensão e aprendizado por parte dos alunos, estimular a relação professor-aluno, além de observar os resultados que o lúdico pode trazer para o fortalecimento do conhecimento e para o desenvolvimento do ser humano. É uma pesquisa bibliográfica qualitativa que teve como base trabalhos de vários professores/pesquisadores que abordam a ludicidade nas fases infantil, adolescente e adulta, assim como o uso do lúdico nas aulas de inglês por meio de propostas metodológicas sugeridas por alguns pesquisadores no decorrer do estudo. Através da leitura dos textos, foi possível observar que a ludicidade é muito importante como incentivo para os alunos obterem maior conhecimento sobre a língua. Todos os profissionais que realizaram atividades lúdicas em sala de aula alcançaram os seus objetivos.</span></span></span></p><p align="justify"><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span><strong>Termos para indexação: </strong></span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span>a</span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span>prendizado, conhecimento, lúdico</span></span></span></p><p lang="en-US" align="justify"><span><span style="color: #000000;"><span style="font-family: 'Times New Roman', serif;">This study discuss the feasibility of using playful activities in English class in order to promote a greater understanding and learning by students, encourage student-teacher relationship, besides observing the results that the playful activities can bring to the strengthening of knowledge and the development of human beings. It is a bibliographical qualitative research which was based on the work of several teachers / researchers who deal with playfulness on childhood, adolescence and adulthood, as well as the use of playful activities in English classes. By reading texts it was possible to observe that playfulness is a very important incentive for students to gain greater knowledge of the language. All professionals analyzed, who performed recreational activities in the classroom, have achieved their goals.</span></span></span></p><p><span style="color: #000000;"><span style="font-family: 'Times New Roman', serif;"><span><span lang="en-US"><strong>Index terms</strong></span></span></span></span><span style="font-family: 'Times New Roman', serif;"><span><span lang="en-US"><strong>: </strong></span></span></span><span style="font-family: 'Times New Roman', serif;"><span><span lang="en-US">l</span></span></span><span style="font-family: 'Times New Roman', serif;"><span><span lang="en-US">earning, knowledge, playful activities</span></span></span></p>
Impactos da educação física escolar na escolha dos(as) discentes por um estilo de vida fisicamente ativo fora da escola
Authors: Santos José Wilson Felipe dos , Silva Diego Francisco da 
Published: August 2020

<p><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;">Este estudo consistiu numa pesquisa de delineamento transversal que buscou avaliar o perfil de atividade física dos(as) discentes de duas instituições públicas de ensino, bem como, a partir do aspecto motivacional, conhecer a influência das aulas de Educação Física Escolar na escolha dos(as) discentes em atividades físicas fora do contexto escolar. Foram utilizados o Questionário Internacional de Atividade Física (IPAQ) e o Questionário de Atividade Física Fora da Escola (QAFFE). Com isso, o estudo identificou que a maioria dos jovens foram classificados como “ativo” e “muito ativo” (83,33% na escola de referência e 66,66% na escola de aplicação), e que grande parte dos(as) estudantes consideram que as aulas de Educação Física influenciam na escolha de atividades físicas fora do contexto escolar (75% na escola de referência e 66,66% na escola de aplicação).</span></span></p><p align="justify"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: small;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><strong>Palavras-chave</strong></span></span><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><strong>: </strong></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><span><span>Atividade física. </span></span></span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><span><span>E</span></span></span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><span><span>ducação física. </span></span></span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><span><span>E</span></span></span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><span><span>scola. </span></span></span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><span><span>M</span></span></span></span></span><span style="color: #00000a;"><span style="font-family: 'Times New Roman', serif;"><span style="font-size: medium;"><span><span>otivação.</span></span></span></span></span></span></span></p>
Austeridade e neoliberalismo no Brasil pós-golpe
Authors: Silva Wagner Pires da , Barbosa Erlene Pereira 
Published: August 2020

<p>A derrocada do PT da Presidência da República representou uma guinada nas políticas públicas, antes orientadas por uma perspectiva de reforma do capital, para uma postura neoliberal. Para entender as mudanças decorrentes, o trabalho apresenta o documento “Uma Ponte para o Futuro”, no qual o PMDB apresenta seu programa pró-mercado. O texto mostra a atual lógica que campeia o campo político majoritário do país e a necessidade da adoção de posturas que vão além do capital para construir uma saída para a crise econômica, política e institucional em que o Brasil está imerso. </p>
Drivers of the spatial phytoplankton gradient in estuarine–coastal systems: generic implications of a case study in a Dutch tidal bay
Authors: Jiang Long , Gerkema Theo , Kromkamp Jacco C. , van der Wal Daphne , Carrasco De La Cruz Pedro Manuel , Soetaert Karline 
Published: August 2020

Abstract. As the primary energy and carbon source in aquatic food webs, phytoplankton generally display spatial heterogeneity due to complicated biotic
and abiotic controls; however our understanding of the causes of this spatial heterogeneity is challenging, as it involves multiple regulatory mechanisms. We applied a combination of
field observation, numerical modeling, and remote sensing to display and interpret the spatial gradient of phytoplankton biomass in a Dutch tidal
bay (the Eastern Scheldt) on the east coast of the North Sea. The 19 years (1995–2013) of monitoring data reveal a seaward increasing trend in
chlorophyll-a (chl a) concentrations during the spring bloom. Using a calibrated and validated three-dimensional hydrodynamic–biogeochemical model, two
idealized model scenarios were run: switching off the suspension feeders and halving the open-boundary nutrient and phytoplankton loading. Results
reveal that bivalve grazing exerts a dominant control on phytoplankton in the bay and that the tidal import mainly influences algal biomass near the
mouth. Satellite data captured a post-bloom snapshot that indicated the temporally variable phytoplankton distribution. Based on a literature review,
we found five common spatial phytoplankton patterns in global estuarine–coastal ecosystems for comparison with the Eastern Scheldt case: seaward
increasing, seaward decreasing, concave with a chlorophyll maximum, weak spatial gradients, and irregular patterns. We highlight the temporal
variability of these spatial patterns and the importance of anthropogenic and environmental influences.
An integration of gauge, satellite, and reanalysis precipitation datasets for the largest river basin of the Tibetan Plateau
Authors: Wang Yuanwei , Wang Lei , Li Xiuping , Zhou Jing , Hu Zhidan 
Published: August 2020

Abstract. As the largest river basin of the Tibetan Plateau, the
upper Brahmaputra River basin (also called “Yarlung Zangbo” in Chinese)
has profound impacts on the water security of local and downstream
inhabitants. Precipitation in the basin is mainly controlled by the Indian
summer monsoon and westerly and is the key to understanding the water
resources available in the basin; however, due to sparse observational data
constrained by a harsh environment and complex topography, there remains a
lack of reliable information on basin-wide precipitation (there are only
nine national meteorological stations with continuous observations). To
improve the accuracy of basin-wide precipitation data, we integrate various
gauge, satellite, and reanalysis precipitation datasets, including GLDAS,
ITP-Forcing, MERRA2, TRMM, and CMA datasets, to develop a new precipitation
product for the 1981–2016 period over the upper Brahmaputra River basin, at
3 h and 5 km resolution. The new product has been rigorously validated at
different temporal scales (e.g., extreme events, daily to monthly
variability, and long-term trends) and spatial scales (point and
basin scale) with gauge precipitation observations, showing much improved
accuracies compared to previous products. An improved hydrological
simulation has been achieved (low relative bias: −5.94 %; highest Nash–Sutcliffe coefficient of efficiency (NSE):
0.643) with the new precipitation inputs, showing reliability and potential
for multidisciplinary studies. This new precipitation product is openly
accessible at https://doi.org/10.5281/zenodo.3711155 (Wang et
al., 2020) and additionally at the National Tibetan Plateau Data Center
(https://data.tpdc.ac.cn, last access: 10 July 2020, login required).
Design study for a multicomponent transducer for wind turbine test benches
Authors: Gnauert Jonas , Jacobs Georg , Kock Stefan , Bosse Dennis , Janik Benjamin 
Published: August 2020

Abstract. This paper covers the design study of a multicomponent transducer (MCT) for wind turbine test benches. The MCT will cover the characteristics of wind turbines in the power range of up to 6 MW. The motivation to develop a MCT such as this is to provide satisfying measurement accuracy of loads and moments for all 6 degrees of freedom in order to reduce the uncertainty in the traceability of the drive train behavior due to the applied loads. Therefore, the estimation of the measurement uncertainty is significant with respect to evaluating the design of the MCT. First, the design process of the MCT is briefly introduced. Second, the strain-gauge-based transducer design is investigated under operational conditions (e.g., torque and multiaxial loads) using finite element (FE) simulations to determine the crosstalk effects. Finally, the measurement uncertainties of all quantities are estimated based on these FE simulations according to the type B evaluation of the “Guide to the Expression of Uncertainty in
Measurement” (GUM; JCGM, 2010), including metrological aspects (e.g., linearity deviation and hysteresis) and the crosstalk. It can be shown that the MCT has great potential to significantly improve the
measurement uncertainty for the applied wind loads on a wind turbine test
bench.
Validation of Sentinel-1 offshore winds and average wind power estimation around Ireland
Authors: de Montera Louis , Remmers Tiny , O'Connell Ross , Desmond Cian 
Published: August 2020

Abstract. In this paper, surface wind speed and average wind power derived from Sentinel-1 Synthetic Aperture Radar Level 2 Ocean (OCN) product were validated against four weather buoys and three coastal weather stations around Ireland. A total of 1544 match-up points was obtained over a 2-year period running from May 2017 to May 2019. The match-up comparison showed that the satellite data underestimated the wind speed compared to in situ devices, with an average bias of 0.4 m s−1, which decreased linearly as a function of average wind speed. Long-term statistics using all the available data, while assuming a Weibull law for the wind speed, were also produced and resulted in a significant reduction of the bias. Additionally, the average wind power was found to be consistent with in situ data, resulting in an error of 10 % and 5 % for weather buoys and coastal stations, respectively. These results show that the Sentinel-1 Level 2 OCN product can be used to estimate the wind resource distribution, even in coastal areas. Maps of the average and seasonal wind speed and wind power illustrated that the error was spatially dependent, which should be taken into consideration when working with Sentinel-1 Synthetic
Aperture Radar data.
Effect of Nano B4C on the Tribological Behaviour of Magnesium Alloy Prepared Through Powder Metallurgy
Authors: CHINTHAMANI Sankar , KANNAN Gangatharan , GEORGE Glan Devadhas , SREEDHARAN Christopher Ezhil Singh , RAJAGOPAL Krishna Sharma 
Published: August 2020

In this present study, the particle size of as received magnesium alloy (AZ91) and B4C powders was reduced through high energy ball mills. The combination of AZ91 (both 10 µm and 60 µm) reinforced with nano B4C particles were fabricated by powder metallurgy technique. The incorporation of nano B4C particles to the Mg matrix was done at various weight % such as 5, 10, 15 and 20. The AZ91 composites were fabricated in a suitable die set assembly and the green compacts were sintered in an electric muffle furnace at 500 °C with argon atmosphere for a dwell time of 1 h. The density of the composites was estimated using Archimedes principle. Micro hardness test was carried out for the prepared specimens and dry sliding wear test was conducted by using pin-on-disc apparatus at room temperature with varying loads and sliding velocities by keeping a constant Sliding Distance (SD). Among the various specimens, the composite with 10 µm size attained a higher Vickers hardness value as well as better wear resistant property. Worn surface analysis of the prepared composites was studied using Scanning Electron Microscope (SEM).
Study on Critical Infiltration Behavior and Law of Liquid Aluminum Alloy in Carbon Fiber Preform
Authors: MA Yuiqin 
Published: August 2020

Infiltration effect is an important factor for the preparation of ideal CF/Al composites by liquid infiltration method, so it is necessary to study the infiltration law of aluminum alloy in carbon fiber preform to obtain composite with sufficient and uniform infiltration effect. Through theoretical analysis and calculation of statics and dynamics, critical infiltration pressures of the liquid aluminum alloy in the 2D carbon fiber preform were 0.53 MPa and 3.24 MPa, respectively, when carbon fiber volume fraction was 45 %. Mechanical pressure infiltration method was used to study critical infiltration pressures and behavior of the liquid aluminum alloy in the 2D carbon fiber preform, and the experimental results indicated that the infiltration front of aluminum alloy had never broken through the surface of carbon fiber preform, when the infiltration pressure was 3.5 MPa. Carbon fibers and aluminum alloy were separated and the infiltration effect was not ideal under the pressure of 3.5 MPa. When the infiltration pressure was 7 MPa, the infiltration could be implemented. The actual infiltration pressure of the experiments is greater than the theoretical calculation value, because viscous resistance, solidification resistance and other factors are ignored in the calculation process. However, infiltration depth increases with increase in infiltration time at infiltration pressure of 7 MPa, and this verifies the correctness of the previous theoretical research results.
Effect of Partial Replacement of Ground Granulated Blast Furnace Slag with Sugarcane Bagasse Ash as Source Material in the Production of Geopolymer Concrete
Authors: KATHIRVEL Parthiban , GUNASEKARAN Murali , SREEKUMARAN Sreenath , KRISHNA Arathi 
Published: August 2020

The study on the characteristics of geopolymer concrete (GPC) is of ultimate significance to instill assurance in builders and engineers. Abundant available literatures point towards the utilization of fly ash and ground granulated blast furnace slag (GGBFS) as source material in the production of GPC with little on other materials. India produces nearly 350 MMT of sugarcane for the production of sugar, which lies second only to Brazil in the annual production, the disposal of the bagasse creates an environmental issue needs to be effectively utilized. Hence, this work was intended to investigate the effect of utilizing sugarcane bagasse ash (SCBA) as a source material in the production of geopolymer mixes. The fresh (consistency, setting time, soundness and flow), hardened (density, compressive strength, expansion and pH) and microstructural properties (X-ray diffraction) of the tested mixes were asessed. The results infer that 20 % replacement level of GGBFS with SCBA produces superior compressive strength and all other results were within the permissible limits even at 40 % replacement level.