bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Iron Ore Tailings Particle Sizes on the Thermal Properties of Epoxy and Polypropylene Matrix Composites
Authors: Oyebode Johnson O , Mbagwu Vivian N , Onitiri Modupe A , Adewumi Olayinka O 
Published: September 2020

Thermal properties of materials such as plastic matrix composite is one of the important parameters for determining their behaviour and relevant applications. This present work focuses on determining the thermal behaviour of epoxy and polypropylene (PP) matrix composite reinforced with iron ore tailings (IOT) particulates of sizes 150 µm, 212 µm and 300 µm at various loadings of 5%, 10%, 15%, 20%, 25%, and 30%. The thermal behaviour of the developed composites was investigated experimentally using a KD2 pro thermal analyser. The results obtained from the experiment showed that increasing filler loading in epoxy leads to increased specific heat capacity and thermal resistivity. The maximum values recorded for the thermal resistivity and specific heat capacity were 0. 592°C.m/W and 2.352 J/kgK respectively. Thermal conductivity and thermal diffusivity of values 0.168W/mK and 0.089 mm²/s respectively were the lowest obtained for the epoxy matrix composite. It was also observed that addition of IOT in PP had significant effect on the thermal properties of the PP composite. Thermal conductivity and thermal diffusivity were found to increase with increased particle loading compared to the pure PP sample; the highest value being 2.235 W/mK and 5.51 mm²/s for thermal conductivity and thermal diffusivity respectively while low values of 0.05 Cm/W and 0.371 J/kgK was recorded for thermal resistivity and specific heat capacity. The presence of iron ore tailings reduces the thermal conductivity and diffusivity in epoxy but increases the conductivity and diffusivity in polypropylene. Keywords— Composite, Epoxy, IOT, Polypropylene, Composite, Thermal Conductivity
Geotechnical and Mineralogical Appraisal of Shale and Claystone Facies of the Maastrichtian Patti Formation, Bida Basin, Nigeria
Authors: Ojo Olusola J , Omotoso Oladele A , Agbelekale Adams , Adepoju Suraju A , Awe Ayodeji , Ajisafe Yemisi C 
Published: September 2020

The need for construction materials in the rapidly developing areas around Federal Capital Territory, Abuja, Nigeria cannot be overemphasized and this study was undertaken in line with this need. The study area, located about 60km from Abuja, is underlain predominantly by shales and claystones of the Patti Formation. These argillaceous rocks may offer locally sourced construction material if they meet certain specifications, however to date, there has not been a geotechnical study of these rocks. The geotechnical properties and the mineralogy of the shale and claystone were investigated to evaluate their suitability for civil engineering works. Particle size distribution, Atterberg limits and X-ray diffraction analyses were performed on fifteen shale and claystone samples collected from three localities (along an approximately 25km transect) for determination of their geotechnical properties and mineralogical composition. Mineralogical data obtained show the samples are dominated by kaolinite with minor amount of montmorillonite. Quartz and minor amounts of microcline, rutile and anatase dominate the non-clay mineral fraction. Particle size data indicate high proportion of fines and they are well graded. The Atterberg limits indicate that the samples have average values of liquid limit of 51%, plastic limit of 23%, plasticity index of 29% and shrinkage limit of 13%. These indicate they are of medium compressibility, low to medium shrink/swell potential, marginal expansive rating and low permeability. High bulk specific gravity (average of 2.61) suggests the samples are inorganic and this is supported by the consistency limits values. Generally, the results indicate the shale and claystone can be useful as stabilizing materials in civil engineering works. In addition, the marginally expansive nature of the shale and claystone, low permeability and intermediate to high plasticity may make them suitable as road subgrade.Keywords— activity, Bida Basin, Gerinya, Kaolinite, plasticity, Patti Formation
Preparation and Water Absorption Properties of Parinari polyandra Fruit Shell Reinforced Epoxy Composites
Authors: Odetoye Temitope E , Ashaolu Olaide O 
Published: September 2020

— The need to protect the environment has led to renewed research interest in sustainable bio-based materials such as natural fibre-reinforced polymer composites. Parinari polyandra (Benth) fruit shell (PPFS) is a woody biomass residue that is scarcely explored. This work reports the use of parinari as the fiber reinforcement in epoxy resin matrix biocomposites. The biocomposites were prepared from 2mm sized particles using hand layup method and by varying fibre contents from 0 to 40 wt %. The biocomposites affinities for water were determined by short and the long term water absorption tests according to ASTM standards. Water absorption capabilities of the biocomposites increased with increasing fibre contents while 10 wt% fibre content gave excellent moisture resistance property. The lowest water absorption of 0.01 and 0.2% for short term and long term tests respectively occurred in the 10 wt % filler content which compared very well with the control at short term test. PPFS is hereby suggested as a suitable natural filler material for bio-epoxy composite with desirable water absorption resistance properties.Keywords— Agricultural waste, Biocomposites, Parinari, Water absorption, West Africa
Performance Characteristics of GE Frame 8 Gas Turbine Power Plant at Different Climatic Zones in Nigeria
Authors: Sanusi Yinka S , Ukanu John , Dandajeh Hamisu A 
Published: September 2020

Climatic conditions such as the ambient temperature and relative humidity has been reported to affect the performance of gas turbines. Nigeria has three major climatic zones: the tropical rain forest, savanna zone, and swampy zone. The different climatic conditions at these zones will affect the performance of power plant. In this work, the performance characteristics of a 125 MW General Electric (GE) frame 8 gas turbine plant were studied at these zones. Sokoto, Lagos and Delta states were used as the representative states for the Savanna zone, Tropical rain forest, and swampy zone, respectively. Thermodynamic analysis of various components of the gas turbine was carried out using Engineering Equation Solver (EES) software. The model developed was validated using operating data of 2016 for a currently installed power plant located in Ondo state, Nigeria. The predicted and actual power generated were observed to follow the same trend. The maximum deviation between the predicted power generated using the model developed and actual power generated is less than 4%. Results further showed that when relative humidity was considered, the power generated from the modeled gas turbine was higher than the power generated when the relative humidity was neglected. By neglecting the effect of humidity, the power output from a GE frame 8 gas turbine can be under-predicted by about 2.3%. This represents an average daily under prediction of about 65 MWh. The power generated by GE frame 8 gas turbine in the month of January was highest in Sokoto state, while the power generated in the months of April, July and October were highest in power plant located in Delta state. The power plant located in Delta state will generate 6,157 MWh and 1,244 MWh more power annually than power plants located in Sokoto and Lagos state, respectively.Kewords- Frame 8 gas turbine, Engineering Equation solver software, Performance characteristics, Nigeria, climatic zones
Kebutuhan Remaja Mempersiapkan Perawatan Kebersihan Menstruasi Di Daerah Pedesaan
Authors: Ratnawati Eka 
Published: September 2020

Remaja mengalami perubahan pesat, baik secara biologis, psikologis maupun sosial dalam masa pubertas menuju ke tahap perkembangan dewasa. Perubahan yang paling mencolok dalam masa ini adalah terjadinya menarche. Remaja harus dipersiapkan untuk menghadapi menarche agar mampu melakukan perawatan menstruasi dengan benar. Remaja di daerah pedesaan banyak mengalami keterbatasan, terutama akses informasi yang benar tentang menstruasi dan perawatannya. Tujuan dari penelitian ini yaitu untuk mengetahui kebutuhan remaja untuk mampu melakukan perawatan kebersihan menstruasi di daerah pedesaan. Teknik pengambilan sampel menggunakan Purposive sampling yang melibatkan 7 orang remaja putri usia 10-14 tahun di Desa Simpar, Tretep, Temanggung. Penelitian dilakukan pada bulan Juni 2016 sampai dengan Januari 2017, melalui FGD. Analisis data dilakukan secara manual dengan content analysis. Muncul 6 tema dalam penelitian ini, yakni: 1) Remaja memerlukan informasi yang lengkap dan benar tentang menstruasi dan perawatan menstruasi, 2) Remaja memerlukan sumber informasi yang bisa diakses dengan mudah dan privasi, 3) Perlu pemilihan waktu yang tepat dalam penyampaian informasi, 4) Remaja perlu bantuan awal saat mengalami menarche, 5) Tindakan responsif yang harus dilakukan saat terjadi menarche, 6) Remaja memerlukan fasilitas perawatan kebersihan menstruasi yang layak. Remaja di daerah pedesaan sangat memerlukan informasi dan penjelasan dengan lengkap dan benar dari orang terdekat (ibu) dan orang yang berpengaruh (guru) tentang perawatan kebersihan menstruasi dan tindakan yang harus segera dilakukan saat terjadi menarche. Proses penyampaian informasi ini harus dilakukan sebelum remaja mengalami menarche. Kata kunci: remaja; menarche; menstruasi; perawatan menstruasi
The influence of MK-801, glutamate and glycine via the modulation of N-methyl-D-aspartate receptors on isolated rat heart
Authors: Govorushkina N. S. , Bolevich S. B. , Jakovlevich V. , Tachieva B. I. , Bolevich S. S. , Orlova A. S. , Fokina M. A. , Saltykov A. B. , Morozova E. M. , Samburova N. V. , Vukolova M. N. , Tezikov E. B. 
Published: September 2020

N-methyl-D-aspartate (NMDA) receptors belong to the group of inotropic glutamate receptors, which are found in rat cardiomyocytes.Aim. To evaluate the influence of a non-competitive antagonist of NMDA-receptors — МК-801, separately or in combination with glutamate and/or glycine, on cardiodynamic parameters, coronary flow and oxidative stress biomarkers in isolated rat heart.Materials and methods. 40 Wistar albino rats were divided into 4 groups (10 rats per group). Aorta of isolated rat heart was cannulated and perfused retrogradely by Krebs-Henseleit buffer in the Langendorf mode. Group 1 received МК-801 (50 µmol/l), group 2 received МК-801 and glycine (100 µmol/l), group 3 received МК-801 and glutamate (100 µmol/l) and group 4 received МК-801, glutamate and glycine. Parameters of cardiac dynamics and coronary blood flow were registered during the last minute of tested substance infusion (E) and at the point when artery perfusate samples were taken at the end of the control period (C). The difference between two points (C and E) was calculated and expressed in percent with a standard deviation.Results. Group 1 demonstrated the most prominent decrease of peak left ventricle (LV) pressure increase velocity (–47.59 ± 5.65)%, systolic and diastolic LV pressure: (–45.18 ± 4.87)% and (–37.24 ± 5.15)%, respectively and cardiac rate: (–28.63 ± 3.00)%. The most significant decrease of minimal LV pressure increase velocity was observed in group 2: (–47.43 ± 5.68)%, decrease of coronary blood flow — in group 3: (–23.02 ± 2.49)%. The most significant decline of oxidative stress biomarkers — nitrite and hydrogen peroxide — was observed in group 3: (–29.24 ± 2,70)% and (–23.43 ± 3.15)%, respectively; of superoxide anion radical (O2–) — in group 2: (–55.72 ± 6.90)%, of lipid peroxidation index — in group 1: (–35.77 ± 4.49)%.Conclusion. Administration of МК-801 results in a statistically significant decrease of cardiac dynamic parameters and lipid peroxidation index, compared to MK-801 in combination with glutamate and/or glycine.
Liver fibrosis assessment by transient elastography in patients with liver cirrhosis after hepatitis C virus eradication
Authors: Nabatchikova E. A. , Abdurakhmanov D. T. , Nikulkina E. N. , Rozina T. P. , Tanaschuk E. L. , Moiseev S. V. 
Published: September 2020

Direct-acting antivirals (DAAs) therapy is associated with fibrosis regression in patients with hepatitis C virus liver cirrhosis.Aim. To study the dynamic of liver fibrosis in cirrhotic patients with a DAAs-induced sustained virological response (SVR).Materials and methods. The retrospective cohort study included 80 cirrhotic patients (male — 43%, median age 54 years). Liver stiffness (LS) was measured by transient elastography before treatment and after SVR. Patients with LS improvement ≥30% were included in group 1, other patients — in group 2. Clinical, laboratory and instrumental parameters were assessed. Independent risk factors for the absence of LS improvement ≥30% were determined by binary logistic regression with the definition of odds ration (OR) and 95% confidence interval (CI).Results. LS reduced from 21.35 (15.2; 27.7) to 13.5 [10.1; 20.0] kPa (p < 0.001), the median reduction was 5.1 [2.6; 11.0] kPa. Regression of fibrosis from F4 to F2 and F3 stages was observed in 16 (20%) and 19 (24%) of cases, respectively. Overall, 36 patients were included in group 1, 44 patients — in group 2. Platelet counts increased in group 1 compared to group 2 by 24.5% vs 5.2% (p = 0.014), a disappearance or reducing the size of esophageal varices were observed in 72% vs. 35% of cases (p = 0.035). Significant differences in ALT, AST, albumin, prothrombin time dynamics were not observed. Baseline albumin level ≤35 g/l is an independent risk factor for the absence of significant improvement of LS: OR 6.7 (95% CI 1.7–25.9, p = 0.006).Conclusion. SVR leads to fibrosis regression to F2-F3 stages in 44% of patients. Baseline albumin level ≤35 g/l is an independent risk factor for the absence of significant improvement of LS.
Study of the effect of the concentration of sodium carboxymethylcellulose on hemostatic and antiadhesive activity during liver operations in an experiment
Authors: Soldatova D. S. , Bezhin A. I. , Kudryavtseva T. N. 
Published: September 2020

Liver surgeries are associated with the risk of bleeding and the development of adhesive disease. Sodium carboxymethylcellulose (Na-CMC) forms an elastic swelling gel and a “lattice” that holds the blood cells.The aim: determine the concentration of Na-CMC, which has the maximum hemostatic and anti-adhesive effect, during liver surgeries in the experiment.Materials and methods. The coagulating effect of Na-CMC (from 0.5% to 9%) was studied in vitro. In vivo experiment on 167 male Wistar rats weighing 185–250 g studied the bleeding time and the amount of blood loss, anti-adhesive activity in the model of liver surgery by cutting off the edge of the organ in the standard way: the depth and width of the wound is 1 cm; the height is 3 mm.Results. In vitro the minimum coagulating effect was obtained in 3% of Na-CMC. In vivo the maximum effect on reducing the bleeding time (–46% compared to the control, p < 0.01) and the amount of blood loss (–27% compared to the control, p < 0.01) had 6% Na-CMC. Then, according to the degree of decrease in the bleeding time, there were: 5% Na-CMC (–40%), 4% Na-CMC (–37%), 3% Na-CMC (–29%), 7% Na-CMC (–27%), 8% Na-CMC (–11%). For the amount of blood loss, a similar pattern of decreasing effect was observed: 5% Na-CMC (–21%), 4% Na-CMC (–14%), 7% Na-CMC (–12%), 3% Na-CMC (–11%), 8% Na-CMC (–5%). When comparing all the studied concentrations of Na-CMC gel with the control group in terms of bleeding time and blood loss, the differences are statistically significant: p < 0.01. Maximum anti-adhesive activity was observed for 6% Na-CMC on days 7 and 14 after surgery: the adhesive process was estimated at 0.497 [0.000–0.497] and 0.962 [0.000–1.301] points vs. 2.457 [2.118–2.457] and 4.071 [3.758–4.602] points in the control group (p < 0.01).Conclusion. The maximum hemostatic and anti-adhesive effect has 6% Na-CMC.
Perempuan-Perempuan ‘Pembawa Pesan’ dalam Layar Kaca
Authors: Muthmainnah Yulianti 
Published: September 2020

Dua puluhan tahun lalu, media yang bisa mendekatkan jarak yang jauh serta bisa diakses dengan mudah, hanya butuh beberapa menit saja dengan cara mengirimkan tulisan adalah email. Kini, di tahun 2018, email bahkan bisa mengirimkan gambar, suara, dan video bergerak. Selain itu, ada facebook, dropbox, skipe, instagram, twitter dan lain sebagainya. Media-media sosial di atas berkembang sangat cepat. Informasi baik yang benar ataupun tidak (hoax) dari belbagai manca negara dengan mudah bisa tersebar hingga ke pelosok negeri. Sekalipun perkembangan tehnologi dan akses pada media demikian luas, gambar layar kaca maupun layar lebar tetap memiliki tempat tersendiri.
Industri film tetap hidup, pun film-film yang berdurasi panjang, bersambung hingga beberapa episode nyaris selalu ditunggu penonton. Ada kenikmatan tersendiri ketika menonton film, apalagi bila film bisa diakses dalam genggaman tangan. Film-film tersebut bisa dinikmati sambil berdiri di atas bis atau kereta dengan mudah melalui aplikasi iflix. Lantas, bagaimana film-film tersebut mencitrakan perempuan? Artikel ini mengkaji bagaimana film menjadi medium komunikasi, bukan saja sekadar hiburan, tetapi juga sebagai media yang mampu memberikan pencerahan dan pendidikan. Juga berperan sebagai alat propaganda atas sebuah tujuan, yang pada akhirnya disadari atau tidak akan membawa pengaruh yang kuat terhadap pola pikir suatu masyarakat.
PENGARUH GAYA DAN MOTIVASI BELAJAR TERHADAP KEMAMPUAN PENALARAN MATEMATIS
Authors: Sumartiningsih Deviana , Sari Lisma Dian K. 
Published: September 2020

Dalam proses belajar mengajar, salah satu kunci keberhasilan siswa adalah menggunakan gaya belajar yang sesuai agar mampumenyerap, mengatur, dan mengolah informasi yang diterima. Faktor lainnya adalah motivasi belajar sebagai pendorong siswa untuk meraih sebuah prestasi. Penelitian ini bertujuan untuk mengetahui apakah ada pengaruh gaya belajar dan motivasi belajar terhadap kemampuan penalaran matematis siswa pada mata pelajaran matematika. Penelitian kuantitatif ini dilakukan dengan jumlah sampel sebanyak 100 siswa menggunakan teknik Simple Random Sampling. Metode pengumpulan data menggunakan angket dan tes.Teknik analisis data yang digunakan adalah analisis regresi berganda, dan untuk uji hipotesis menggunakan korelasi ganda. Hasil penelitian menunjukkan bahwa terdapat pengaruh yang signifikan antara gaya belajar dan motivasi belajar terhadap kemampuan penalaran matematis siswa. Diperoleh persamaan regresi dengan kontribusi sumbangan efektifitas garis regresi sebesar 6,67%. Dari hasil uji F dan korelasi ganda diperoleh Fhitung sebesar 3,4661 dan Rhitung sebesar 0,2584. Diperoleh Freg lebih besar dari Ftab ini menunjukkan bahwa hipotesis diterima.
A política como conflito: a noção de antagonismo na teoria de Ernesto Laclau
Authors: Baron Letícia , Linhares Bianca De Freitas 
Published: September 2020

O artigo tem por objetivo apresentar as dimensões que a noção de antagonismo possui na teoria do discurso de Ernesto Laclau e Chantal Mouffe. Sabendo que os autores constroem um amplo aparato analítico e conceitual consubstanciado no conflito como inerente à política, o artigo visa compreender como os autores concebem a noção de antagonismo e qual a sua relevância teórica. Para atingir tal fim, adota-se como metodologia a análise bibliográfica, especificamente das obras Hegemonia e Estratégia Socialista: por uma política democrática radical, Novas Reflexões sobre a Revolução de Nosso Tempo, A Razão Populista, Fundamentos Retóricos da Sociedade e de alguns comentadores. Os resultados mostram que o antagonismo se mostra pelo caráter relacional dos processos de identificação dos discursos na ordem do social e vincula-se à contingência e à precariedade do discurso hegemônico.
The human side of geoscientists: comparing geoscientists' and non-geoscientists' cognitive and affective responses to geology
Authors: Lacchia Anthea , Schuitema Geertje , McAuliffe Fergus 
Published: September 2020

Abstract. Geoscientists and non-geoscientists often struggle to communicate with each
other. In this paper we aim to understand how geoscientists and
non-geoscientists perceive geological concepts and activities, that is, how
they think (cognitive responses) and feel (affective responses) about them.
To this effect, using a mixed-methods approach, we compare mental models –
people's representation of a phenomenon – of the subsurface,
mining/quarrying, and drilling, between geoscientists (n=24) and
non-geoscientists (n=38) recruited in Ireland. We identify four dominant
themes which underlie their mental models: (1) degree of knowledge and
familiarity, (2) presence of humans, (3) affective beliefs, and (4) beliefs
about perceived impact of the activities. While the mental models of the
non-geoscientists focused more on the perceived negative environmental and
economic impacts of geoscience, as well as providing evidence of lay
expertise, those of the geoscientists focused more on human interactions. We
argue that mental models of geoscientists and non-geoscientists are the
result of beliefs, including both cognitive and affective components, and
that both components need to be acknowledged for effective dialogue between
the two groups to take place.
Multipoint reconstruction of wind speeds
Authors: Behnken Christian , Wächter Matthias , Peinke Joachim 
Published: September 2020

Abstract. The most intermittent behaviour of atmospheric turbulence is found for very short timescales. Based on a concatenation of conditional probability density functions (cpdf's) of nested wind speed increments, inspired by a Markov process in scale, we derive a short-time predictor for wind speed fluctuations around a non-stationary mean value and with a corresponding non-stationary variance. As a new quality this short-time predictor enables a multipoint reconstruction of wind data. The used cpdf's are (1) directly estimated from historical data from the offshore research platform FINO1 and (2) obtained from numerical solutions of a family of Fokker–Planck equations in the scale domain. The explicit forms of the Fokker–Planck equations are estimated from the given wind data. A good agreement between the statistics of the generated and measured synthetic wind speed fluctuations is found even on timescales below 1 s. This shows that our approach captures the short-time dynamics of real wind speed fluctuations very well. Our method is extended by taking the non-stationarity of the mean wind speed and its non-stationary variance into account.
Paradoxes of Being and Becoming South Asian Single Mothers: The Enclave Economy, Patriarchy, and Migration
Authors: Banerjee Pallavi , Chacko Soulit , Piya Bhumika 
Published: September 2020

AbstractBased on ethnography in a South Asian ethnic enclave and in-depth interviews with South Asian immigrant women, including single mothers working in the enclave, we explore the becoming and being of South Asian single motherhood. We specifically inquire how the becoming of single mothers affects the work–family lives of the mothers in an enclave economy. We show that the interplays of structural forces like immigration laws, racialized model-minority discourses, gendered ideologies of South Asian motherhood, and underlying patriarchy of the enclave economy create what we call “uneven paradoxes” for South Asian single mothers that further marginalize them. We further suggest that the single mothers challenge the paradoxes that mire their lives by striking up “patriarchal bargains” to find resources for themselves and their children and thus find agency within their constraining circumstances.