bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determining a model of the blade in a wind turbine for regions with low wind speeds
Authors: Yurchenko Oleksandr , Radchuk Oleg , Barsukova Hanna , Savchenko-Pererva Marina , Ivchenko Oleksandr , Kolodnenko Vitaliy , Fesenko Denys 
Published: May 2023

The object of research is the shape of the blade of a vertical-axis installation. The problem solved in this work is to find the optimal shape of the blade for a wind power installation for operation at low wind speeds or in areas where its flow is limited. In the course of the work, the interaction between each blade option and the wind flow depending on the shape of the blade was considered. With the help of a reduced model of the wind turbine, a flat blade, a blade with a «pocket», and a blade with a «pocket» and a slit were tested. The test results prove the effectiveness of the designed and manufactured blade with a «pocket» and a slit. This was confirmed by the study results, according to which, during the experiment, the number of revolutions of a wind turbine with blades made with a «pocket» and a slit was the largest. In comparison with flat-shaped blades, the increase was 20 %, and, in comparison with blades with a «pocket», the increase was 10 %. In order to compare wind turbines that have flat-shaped blades and blades with a «pocket» and a slit, experimental studies and calculations of the power factor Ср were carried out. A flat-blade wind wheel has Ср1=24; a blade with a «pocket» – Ср2=52.9; a blade that has a «pocket» and a slit – Cp3=58.7. Therefore, one can assume that the power generated by the wind wheel with the above blades is also the largest, Р3=98 W, compared to two other shapes of blades: flat, P1=32.3 W; with a «pocket», Р2=88.2 W. It would increase during the test time from zero speed to reaching a constant rotational speed.
The studies confirm that the wind wheel, which has blades with a «pocket» and a slit, has the highest speed of rotation over the entire period of time when measurements were performed
Developing a risk management approach based on reinforcement training in the formation of an investment portfolio
Authors: Martovytskyi Vitalii , Argunov Volodymyr , Ruban Igor , Romanenkov Yuri 
Published: May 2023

Investments play a significant role in the functioning and development of the economy. Risk management is an integral part of the formation of the investment portfolio. This means that an investor must be willing to take on a certain level of risk in order to receive a certain level of return. However, when forming an investment portfolio, an investor faces such problems as market unpredictability, asset correlation, incorrect asset allocation. Therefore, when forming an investment portfolio, an investor should carefully study all possible risks and try to minimize them. The object of research is an approach to risk management in the formation of an investment portfolio using the method of reinforcement training. The basic principles of formation of the investment portfolio and determination of risks are described. The application of the method of reinforcement training for building a model of risk management of investment portfolio is considered. The process of selecting optimal investment assets based on alternative data sources that minimize risks and maximize profits is also considered. A functional model of the process of risk optimization in the formation of an investment portfolio based on machine learning methods has been developed. The functional model constructed makes it possible to build a process of risk optimization, including asset selection, risk comparison and assessment, to form an investment portfolio and monitor its risks. The study results showed that the proposed approach to the formation of the investment portfolio increased the total growth of the investment portfolio by 0.4363 compared to the base model. Also, the volatility indicator improved compared to the market, as evidenced by the percentage difference between the initial and final cash amount, which increased from 128.98 to 295.57
New multifunctional bromine-active polymers: synthesis, properties, and antimicrobial activity
Authors: Murashevych Bohdan , Girenko Dmitry , Toropin Mykola , Koshova Iryna , Kovalenko Vadym , Lebed Oleg , Chuiko Vasyl , Kotok Valerii , Stepanskyi Dmytro 
Published: May 2023

The increase in the frequency and scale of epidemics of infectious diseases gives extreme urgency to the development of new technologies for antiseptic and disinfectant treatment of various media, as well as materials/reagents for their implementation. Antimicrobial polymer materials of various chemical structures, including those containing halogen-active functional groups, are promising in this regard.
This work is devoted to the synthesis and investigation of the properties of granular and fibrous polymer materials with immobilized N-bromosulfonamide groups of different structure. It is shown that copolymers of styrene with divinylbenzene and polypropylene can be used as a carrier polymer. A technique has been developed that allows obtaining polymers with a content of up to 23 % of immobilized active bromine. The compliance of the synthesized materials with the declared structure has been proven by IR spectroscopy and a complex of chemical methods. A decrease in the strength of the obtained polymers compared to the original carriers has been observed, especially in the case of fibers. The stability of the synthesized polymers during storage is lower that of the previously described chlorine-active analogs. For the quantitative determination of active bromine in the target materials, a technique based on its rapid diffusion from the polymer into the taurine solution has been developed. Microbiological research has shown that the synthesized polymers have a pronounced antimicrobial activity, which is higher than that of immobilized N-chlorosulfonamides and is manifested even in the presence of a significant organic load.
The set of investigated characteristics of synthesized polymers with immobilized N-bromosulfonamide groups suggests the prospect of their use as components of antiseptic dressing materials, antimicrobial filters, devices for obtaining antiseptic solutions, and other medical products
Decision-making support system for managing portfolios of energy saving projects at energy-intensive enterprises
Authors: Dubrovin Valerii , Deineha Larysa , Laktionov Valerii 
Published: May 2023

Purpose. Development of a software complex based on decision-making methods for managing a portfolio of energy-saving projects at energy-intensive enterprises.
Methodology. To solve the problem of managing project portfolios, Markowitz's portfolio theory of financial investments was chosen, which allows for the most profitable distribution of portfolio risk and performing income assessment using optimization methods. In combination with this theory, it was determined to use the methods of finding the maximum Sharpe ratio, as well as the minimum volatility based on a data package of randomly generated portfolios.
Findings. As a result of the work performed, a software system was developed, which has in its functionality the automatic download of a data package of selected shares for the specified period of time from the electronic resource, generates a random portfolio and performs its optimization by maximizing the Sharpe ratio and minimizing the volatility of the portfolio. Also, the program has the ability to display the results of optimization of the generated portfolio in the form of tables and graphs.
The decision support system for managing portfolios of energy-saving projects was considered through its generalization to methods of optimizing investment portfolios, but taking into account the specifics of the subject area.
The software complex was tested on a data set of share prices in energy-intensive enterprises. Graphical data and tables obtained as a result of system operation allow the program user to evaluate fully the created energy saving project portfolio.
Originality. The developed software system combines right away several methods, namely: methods of optimizing an investment portfolio according to Markowitz's portfolio theory, methods of finding the maximum Sharpe ratio and methods of finding minimum volatility. This solution allows you to use the system to solve a wide range of tasks.
Practical value. The completed development makes it possible to optimize conveniently the investment portfolios for various assets, which makes it possible to use the development of energy saving project portfolio management in energy-intensive enterprises. Also, the system can serve as a basis for such developments.
“SEM LEI NEM REI, ME VI ARREMESSADO”
Authors: Rodrigues Adriege Matias , Dutra-Pereira Franklin Kaic , Tinôco Saimonton 
Published: May 2023

Este dossiê é resultado dos esforços de pensarfazer pesquisas em meio aos constantes ataques que sofria a educação, durante o (des)governo do inominável. Por esse motivo, anuncia, enuncia e evidencia possibilidades outras de projetos curriculares que foram lançadosarremessados no X Colóquio Internacional de Políticas Curriculares, realizado nos dias 05 e 06 de setembro de 2022, na cidade de João Pessoa/PB. Foi produzido coletivamente, contando com a contribuição de muitas mãos: 3 pessoas que atuaram na editoria ad hoc – vinculadas ao Grupo de Estudos e Pesquisas em Políticas Curriculares (GEPPC) – e 74 que escreveram os textos, além de mais de uma centena de pessoas que emitiram pareceres às cegas e quase uma dezena que trabalhou na editoração e na divulgação dos manuscritos. Como atitude de resistência, ansiávamos/ansiamos por políticas e projetos de currículo que se contraponham às visões conservadoras que têm se manifestado na contemporaneidade, refletidas em bases comuns que aniquilam conhecimentossaberesfazeres e tentam, a qualquer custo, unificar e homogeneizar as gentes. Por esses motivos, convidamos à leitura dos 33 textos que compõem esse dossiê, que foi planejado-escrito-avaliado-publicado-divulgado com muito respeito aos diversos conhecimentos produzidos e ao público que ainda insiste numa educação pública.
“Bebiendo los cabellos de Dios”. Aproximaciones teórico-metodológicas a las ceremonias de yagé en Colombia
Authors: Perdomo Marín Juan Camilo 
Published: May 2023

El presente artículo busca comprender la sobredeterminación de relaciones que me- dian en la reproducción, movilización y consolidación de las ceremonias de yagé en Colombia. Para ello se propondrá una matriz teórico-metodológica desde una lógica post-plural que invita a conceptualizar estas prácticas rituales con base en tres escalas entrelazadas pero autónomas: creencias, intereses y marcos de enunciación. A partir de este modelo multi-escalar se podrá comprender la interrelación en fricción entre las creencias animistas, los umbrales de la economía capitalista y las encrucijadas contemporáneas de la representación étnica que compone este fenómeno.
La empresa educativa universitaria: antropología y economía en una ciudad de Hidalgo, México
Authors: Enciso González Jesús , Ramírez-González Tania Berenice 
Published: May 2023

Dos tendencias mundiales hegemonizan el mundo actual: por un lado la terciarización de las economías y por otro lado la concentración poblacional en las ciudades. Ante estos hechos, la antropología, en sus líneas de estudio económico y urbano, no ha sido indiferente. Así, para entender el acontecer contemporáneo, el antropólogo ha tenido que ampliar sus miras y comprender el universo de las empresas terciarias y de las ciudades. En una provincia mexicana de Hidalgo, México, se está presentando un fenómeno interesante para estos profesionistas: hay un crecimiento importante del sector de los servicios educativos tanto públicos como privados; y, a fin de encontrar ganancias en el corto plazo, las instituciones que los llevan a cabo han venido implementado criterios de organización taylorista, fordista y neofordista de organización del trabajo, generando muy específicas alteraciones en la salud y la identidad de sus comunidades educativas. La metodología utilizada para realizar este estudio es de carácter mixto, ya que implicó el levantamiento de tres centenares de cuestionarios, una guía de observación así como varias entrevistas a fin de rescatar la percepción de los trabajadores de estas instituciones: los docentes.
Pengaruh Suhu dan Lama Pengeringan Terhadap Sifat Kimia dan Fisik Serbuk Bit Merah (Beta vulgaris L.)
Authors: Sangga Harmaili , Widyawati Nugraheni 
Published: May 2023

Beetroot plant or Beta vulgaris L. is one of the horticultural plants which is widely cultivated in various regions of Indonesia. It is because the advantage of the beet plant and its use as a natural red dye powder for food ingredients. Beetroot powder can be produced through the drying or withering method using a draying oven and the use of a drying agent to maintain the quality product during drying. This study aims to determine the effect of temperature treatment and drying time on betasianin,% water level,% yield, vitamin C and organoleptic tests (color and aroma) for the natural dye of beetroot powder. This research used a randomized block design with two (2) factors treatment with 4 replications in order to obtain 24 trials. The treatment factors used were (S) temperature (60°C and 70°C) and (T) drying time (10, 11, and 12 hours). The results of the research of the treatment interaction between temperature and drying time obtained the yield content of the average value was 13% with the water level for the material with the highest average value of 7% at 600C for 10 hours and the lowest was 5% at 700C for 12 hours. For the vitamin C content of beet powder obtained the highest average value on 1.35 mg at 600C for 10 hours. At 600C for 10, the highest betasianin content was 0.151 mg / L. From the organoleptic results, the preferred color of beet powder was at 600C (11 hours) and the preferred aroma was 700C (10 hours).
Studi Pembuatan Minuman Serat Alami yang Kaya β-Karoten
Authors: Siregar Muhammad Said , Tbn Irfan Syukri , Rusmarilin Herla , Ardilla Desi 
Published: May 2023

Research on the study of producing rich beta carotene natural fibers beverage has been done by completely randomized design (CRD) with two replicates. The first factor was the ratio of water spinach stem and melinjo seed skin (S1 = 100:0, S2 = 75:25, S3 = 50:50, S4 = 25:75, S5 = 0:100). The second factor was the addition of carrots juice (W1= 30%, W2= 40%, and W3 = 50%). The parameters observed were fiber content, β-carotene content, water absorption index, oil absorption index, hedonic value of color, flavor and aroma. The statistical analysis was showed that the ratio of water spinach stem and melinjo seed skin provide highly significant effect (P ≤ 0.05) on fiber content, beta carotene content, water absorption index, oil absorption index, hedonic of flavor and aroma as well as had no significant effect (P 0.05) to hedonic of color. The addition of carrot juice provides highly significant effect (P ≤ 0.05) on fiber content, beta-carotene content, water absorption index, oil absorption index, hedonic of aroma, color and flavor.
Simulation of Starch Degradation in Tobacco Leaf during Curing
Authors: Abubakar Yusya 
Published: May 2023

Simulasi penguraian pati di dalam daun tembakau dilakukan dengan mengembangkan model matematika penguraian pati (di dalam daun) sebagai fungsi dari kondisi pengeringan seperti temperatur, kadar air, waktu, dan konsentrasi awal pati. Model penguraian pati ini didasarkan pada persamaan laju orde pertama, dikombinasikan dengan persamaan sekunder. Nilai konstanta yang diperlukan dalam persamaan sekunder ditentukan melalui iterasi dan perbandingan akar dari jumlah galat kuadrat. Model tersebut dipadankan pada data dari experiment untuk menentukan nilai konstanta pada persamaan utama, dengan meminimalkan akar dari jumlah galat kuadrat. Suatu program komputer telah ditulis dan digunakan untuk mensimulasi perubahan kadar pati di dalam daun. Hasilnya menunjukkan bahwa model tersebut dapat memprediksi penguraian pati dengan baik (RMSE = 3.28). Namun demikian, pada beberapa kasus, model penguraian pati tersebut cenderung memprediksi konsentrasi pati yang lebih tinggi dari nilai yang diperoleh dari percobaan.
Karakteristik Emulsifier Mono-Diasil Gliserol (MDAG) dari Crude Palm Oil (CPO) yang berasal dari Fat Pit pada Berbagai Konsentrasi Katalis NaOH
Authors: Silsia Devi , Electrika Fitri , Surawan Dewi , Meiriska Idha 
Published: May 2023

Mono - Diasilgliserol (MDAG) merupakan merupakan emulsifier yang paling banyak digunakan dalam industri makanan. Emulsifier merupakan salah satu produk oleokimia yang bernilai ekonomis tinggi. Penelitian ini bertujuan untuk mengetahui karakteristik MDAG yang dihasilkan dari etanolisis crude palm oil (CPO) yang berasal dari Fat Pit dengan menggunakan katalis NaOH. Reaksi etanolisis dilakukan pada suhu 50°C selama 30 menit. Konsentrasi katalis NaOH yang digunakan adalah 1%, 2%, 3%, 4% dan 5% dari berat minyak. Proses pemisahan dilakukan dengan menggunakan sentifus. Karakteristik MDAG yang diamati adalah kadar air, asam lemak bebas (alb) dan kemampuannya sebagai emulsifier berupa kemampuan produk menurunkan tegangan permukaan, dan menstabilkan emulsi minyak air. Kadar air MDAG yang dihasilkan antara 0,027% - 0,14%, alb antara 1,27% - 0,14%, tegangan permukaan antara 26,76 dyne/cm – 34,86 dyne/cm dan kestabilan emulsi yang terbentuk antara 135 detik – 181,2 detik.
Conductometric properties of alcoholic nanosuspensions of metal oxides
Authors: Gotsulskiy V. Ya. , Stiranets M. V. , Khanchych K. Yu. 
Published: May 2023

In this work, we present the experimental study of nanofluids’ electrophysical characteristics concentration dependencies specific behavior (nanoparticles of Al2O3, ZnO and Fe2O3 in isopropyl alcohol) at low concentrations. The values of a conductivity, electrical capacitance and dielectric permittivity are measured depending on the suspended particles’ concentration for low concentrated nanofluids far from the percolation threshold and for different periods after their preparation. It is shown that the increase of the electrophysical parameters with increasing concentration of the pointed nanoparticles (which themselves are non-conductive) may be explained by a formation of an electrical double layer around the particles and a percolation of particle clusters.
The elasticity of the polymeric composite material with orthotropic structure
Authors: Altoiz B. A. , Savin S. N. , Skorzhevsky A. V. , Ionov R. S. 
Published: May 2023

The preparation of orthotropic polymeric composite is described. Method is based on curing the epoxy resin with nickel carbonyl nanoparticles (the content up to 35 vol.%) directly in the magnetic field B ≈ 0.2 T. The noticeable anisotropy of composite elastic properties is proved by the measurements of Yung's modulus of the disk and plate-shaped samples.
Analysis of relaxation characteristics of penton - AgI
Authors: Shut M. I. , Rokytska H. V. , Rozanovych V. Yu. , Chelnokova S. M. , Rokytskyi M. O. 
Published: May 2023

In this study the composites dCp/dT multiplet dependence has been analyzed in glass transition temperature, the relaxation characteristics have been determined. The form of this dependence is due to the presence of structure-active silver iodide particles. It is shown that calorimetric method of relaxation processes analysis can be used also to polymer composite materials which contain crystallizable polymers, namely, high-molecular polyesters and disperse fillers.
METHODOLOGICAL APPROACH TO DETERMINE THE CAPACITY FOR ENVIRONMENTAL RESILIENCE IN WATERSHEDS
Authors: Oliveira Livania Norberta , Cunha Lucio Sobral , Pereira Eugênia , Cruz Maria Lucia Brito 
Published: May 2023

The determination of resilience capacity constitutes an important tool for environmental conservation and preservation. The aim of the present study was to evaluate the environmental resilience capacity of the lower course of the basin of the Poti River (LCPR) in the state of Piauí in northeastern Brazil. For such, analyses were performed of the natural and socioeconomic aspects of the area. A geographic information system was used for interpreting the lower Poti River and identifying the main existing environmental risks. The images were edited using SPRING 5.2 and ARCMAP 10.3. Environmental resilience capacity was determined by calculating an environmental resilience index (ERI) based on two additional indexes: the natural resilience index (NRI) and the municipal social vulnerability index (MSVI). Environmental resilience capacity was low in the urban areas of the river due to the greater pressure on the environment as a result of demographic density and the exploitation of natural resources. In contrast, rural areas (86 percent of LCRP) showed a moderate-to-high degree of environmental resilience, due to the occurrence of large areas predominantly covered with natural vegetation. The municipal social vulnerability index reflects the various public strategies adopted by administrators. Another finding was that the method developed for evaluating environmental resilience based on the analysis of natural resilience and social vulnerability is important to the planning and management of river basins in terms of the sustainable development of its uses in different geographic areas. KEYWORDS: Vulnerability; Resilience; Hydrographic basin; Sustainability
DESENVOLVIMENTO TERRITORIAL RURAL PARA A COMUNIDADE DE RIO SIRITUBA, ILHAS DE ABAETETUBA – PARÁ
Authors: Pereira Manoel de Jesus Sousa , Ferreira Joanice Moraes , Rodrigues José Edilson Cardoso 
Published: May 2023

O estudo do território ribeirinho, foi realizado na comunidade Rio Sirituba, município de Abaetetuba-PA, tendo como fundamento conceitual o território a partir de um olhar da questão agrária camponês e capitalista. O trabalho visou mostrar a relação de ocupação do Rio Sirituba e o processo de desenvolvimento territorial e as formas de organização presentes na comunidade. Foram realizadas pesquisa de campo, levantamento bibliográfico, entrevistas estruturadas com moradores da comunidade e Agentes Comunitários de Saúde, produção cartográfica de localização do Rio Sirituba. Os moradores, possuem formas de lidar com os recursos disponíveis, a fim de manter sua sustentabilidade ou para o excedente com fins comerciais. No Rio Sirituba, pode-se constatar, que as transformações que ocorreram com o passar das décadas, não foram frutos de conflitos, ou de influencias das grandes empresas, essas mudanças surgiram a partir das necessidades dos povos locais de se adequarem as novas realidades de trabalho, que melhor oferecem sustentabilidade, visto que os engenhos da localidade e a plantação da cana de açúcar já se exauriu, e os pequenos produtores agrícolas possuem dificuldades de escoarem suas produções, por isso a necessidade das associações, cooperativas, instituições religiosas e escolas se organizarem em prol do fortalecimento comunidades tradicionais e ribeirinhas. Palavras-chave: Modo de Vida – Rio Sirituba – Desenvolvimento territorial – Família – Organizações.