bluuebunny/crossref_metadata_2025 huggingface dataset:
Da apresentação à publicação: uma análise da transição de artigos científicos apresentados em congressos nacionais de contabilidade para periódicos
Authors: Silva Bicalho Rodrigues Nicole , Régis Botelho Ducineli
Published: December 2024

Este estudo tem como objetivo analisar a transição dos artigos científicos apresentados nos principais congressos brasileiros de Contabilidade para publicação em periódicos nacionais de extrato Qualis A1 a A4. Para tanto, foi realizada uma coleta de dados dos artigos disponibilizados nos sites dos congressos analisados, enfocando os títulos dos artigos e nomes dos respectivos autores no período compreendido entre 2001 e 2023. Esses dados foram comparados, através de códigos desenvolvidos em Python, com os dados disponibilizados nos sites dos periódicos nacionais, objeto de estudo. Os resultados encontrados indicaram que, embora haja um número significativo de pesquisas aprovadas em congressos científicos, há pouca adesão à posterior publicação desses trabalhos em periódicos. O Congresso da ANPCONT é o maior em pesquisas aceitas, mas é o segundo em publicações em periódicos científicos (5,12%). O Congresso UFSC de Controladoria e Finanças, o segundo maior em trabalhos apresentados, é o terceiro em publicações em periódicos científicos (1,25%). Já o Congresso UnB de Contabilidade e Governança, o mais recente dos congressos da amostra, tem 1,06% de publicações em periódicos científicos, e o USP International Conference on Accounting, o mais antigo, lidera com 6,16% de publicações em periódicos científicos. Em relação à iniciação científica, tem-se o percentual de 3,23% para o Congresso UFSC; 1,14% para o da UnB; 0,61% para o da ANPCONT e 0,11% para o da USP. Esses resultados ajudam a explicar os baixos índices de publicação de trabalhos apresentados nos congressos de Contabilidade.
La libertad de expresión en editoriales de El Universo durante la disputa con Rafael Correa
Authors: Ricaño Yetel
Published: December 2024

Durante el caso El Universo, entre el 2011 y el 2012, la voz editorial del diario de igual nombre denunció ataques a la libertad de expresión en Ecuador por parte del gobierno de Rafael Correa. Fue ese uno de los momentos en que más se trató el tema de libertad de expresión en los medios de comunicación nacionales y, en especial, en el propio rotativo, considerado uno de los más importantes del país, de modo que, entendiendo que es un ejercicio que no se ha repetido hasta la fecha en igual escala, se procedió a hacer un Análisis Crítico del Discurso de la voz editorial con el objetivo de determinar cómo El Universo delineó a la libre expresión durante la disputa legal que sostuviera con el mandatario. Para ello, se analizaron estrategias de organización del discurso, como la presentación positiva del yo, la presentación negativa del otro, la polarización y el uso de los sintagmas libertad de prensa y libertad de expresión. Se determinó que primó el uso instrumental del sintagma libertad de expresión sobre el de libertad de prensa y primó también la concepción de que la libertad de expresión se circunscribía al derecho a la información del ciudadano, lo cual alimentaba el ejercicio pasivo de ese derecho humano fundamental por parte del individuo y garantizaba que el statu quo permaneciera igual.
Las remesas familiares entre República Dominicana y Haití
Authors: Del Rosario Santana Juan
Published: December 2024

El presente articulo tiene como finalidad el analizar el comportamiento de las remesas familiares recibidas y enviadas por/ desde la República Dominicana y la República de Haití, durante el periodo 2010-2023, destacando las diferencias y similitudes de ambos flujos monetarios en cuanto a procedencia, uso, participación relativa en los ingresos de divisas y el Producto Interno Bruto de ambas economías. Para la consecución de estos propósitos, se realizó una amplia revisión documental de estudios, artículos, reportes publicados por diferentes autores, organismos nacionales e internacionales que abordan los temas comerciales y migratorios, así como el uso del análisis cuantitativo  para la interpretación de los datos  que permitieron establecer con claridad las convergencias y divergencias de las transferencias netas unilaterales recibidas y enviadas por los residentes en el extranjero de ambas naciones.  Se confirma como comportamientos similares que ambas economías muestran un flujo creciente bastante dinámico de transferencias netas unilaterales hacia familias de bajos ingresos, las cuales provienen fundamentalmente de Estados Unidos de Norteamérica. Son receptores de remesas provenientes de naciones más avanzadas, con un peso bastante significativo en el Producto Interno Bruto (16% del PIB en el 2023) en el lado haitiano, mientras que en la nación dominicanas eran menos del 2%.  Se identifica que mientras en República Dominicana las familias dan usos diversos a estas remesas en Haití son destinadas principalmente al Consumo y Haití se mantiene como el principal receptor de las remesas enviadas por República Dominicana al exterior (72%), pero apenas Haití remesa a la primera (1.3%).
Liderazgo, control simultáneo y superación de riesgos en los gobiernos regionales del sur del Perú
Authors: Jinchuña Huallpa Jorge , Mayta Huiza Dora Amalia , Flores Arocutipa Javier Pedro , Fernández Sosa Luis Enrique
Published: December 2024

La investigación tuvo como propósito determinar los efectos del liderazgo como variable mediadora entre el control simultáneo y la superación de riesgos en los gobiernos regionales del sur del Perú (Moquegua, Tacna y Arequipa), 2024. La pesquisa es observacional de nivel causal, explicativa, diseño no experimental, transversal, enfoque cuantitativo. Utilizando modelo de medida mediante la técnica PLS, se aplicó encuesta de 03 cuestionarios estructurados validados a una muestra de 230 colaboradores. Los hallazgos del modelo teórico estructural de la variable control simultáneo y la superación de riesgos mediados por el liderazgo revelan que existe relación positiva débil entre las variables de ruta mostrada en modelo teórico. Las acciones del liderazgo de las autoridades y funcionarios de mayor nivel es muy débil 4.10% o sea los cambios que aporta a las relaciones directas es mínima, en la medida que exista mayor liderazgo transformacional y transeccional influirá en forma positiva en el control simultáneo y la superación de riesgos en gobiernos regionales del sur del Perú.
Experiencia del cliente en el éxito de emprendimientos: evidencia de Lima metropolitana
Authors: Ramos Aguilar María Fernanda , Medina Martel Valeria Alexandra , Chávez Vera Kerwin José
Published: December 2024

El objetivo de este estudio es analizar el impacto de la experiencia del cliente en el éxito de los emprendimientos en Lima Metropolitana durante 2024. La metodología utilizada consistió en un modelo de ecuaciones estructurales con la técnica de Mínimos Cuadrados Parciales (PLS) en dos fases: validación del instrumento y confirmación del modelo estructural. Los resultados evidencian que la experiencia del cliente, la calidad del servicio, la interacción personalizada y la experiencia omnicanal son factores clave que influyen significativamente en el crecimiento y desempeño de los emprendimientos. Se concluye que los emprendimientos que priorizan la optimización de la experiencia del cliente, mediante calidad de servicio, interacción personalizada y una estrategia omnicanal, logran un mejor posicionamiento en el mercado y un desarrollo sostenible.
Resenha do Livro “Atividades aquáticas: um olhar dirigido ao ensino”
Authors: Reis Rômulo Meira , Faria Marina Cocco , Serpa Caio
Published: December 2024

O presente trabalho apresenta uma resenha crítica sobre o livro - Atividades aquáticas: um olhar dirigido ao ensino, escrito por Guilherme Tucher e Márcia Fajardo,  o qual representa uma obra fundamental para quem busca uma compreensão aprofundada sobre o ensino e aprendizado de esportes aquáticos. Este livro educacional oferece um mergulho completo no mundo das atividades aquáticas, destacando-se por sua abordagem pedagógica cuidadosa e abrangente, dedicada aos professores.
The Impact of Cloud Computing on the Growth of Technology Startups
Authors: Alfallah Fadhly , Veri Jhon
Published: December 2024

This study focuses on the Impact of Cloud Computing on the Growth of Technology Startups. Using the Systematic Literature Review (SLR) approach, this study analyzed 95 articles from various academic sources such as Google Scholar. The collected data was extracted using tools such as Publish or Perish. to filter articles relevant to this topic. The results of the study indicate that the adoption of cloud computing provides the flexibility and scalability that are much needed by startups to face market dynamics. In addition, cloud-based services enable better collaboration and accelerate product time-to-market. This study highlights the importance of an effective cloud computing implementation strategy to maximize its positive impact on the growth of technology startups.
Problematic fossils from the Upper Cretaceous of western Bulgaria might be the first record of Mesozoic insects in the country
Authors: Nikolov Vladimir , Simov Nikolay , Vasile Ştefan , Csiki-Sava Zoltan , Dochev Docho , Yaneva Marlena , Bogdanova Ralitsa , Hristova Latinka
Published: December 2024

Recent work at the Upper Cretaceous vertebrate locality near the town of Tran, western Bulgaria, brought to light a diverse assemblage of plant mesofossils and other microfossils of uncertain systematic affinities. Here we briefly report on 18 problematic specimens that share a striking morphological similarity to the Late Cretaceous Knoblochia cretacea, an ichnotaxon thought to be an insect egg. This material appears to represent the first record of Mesozoic insects from Bulgaria.
New data on the spatial distribution of the Paleogene lithostratigraphic units in the offshore part of the Moesian Platform southeast of the town of Varna
Authors: Valchev Boris , Dimitrov Hristo , Sachkov Dimitar
Published: December 2024

The study is based on lithostratigraphic interpretation of three seismic profiles and reinterpretation of five borehole logs in the offshore part of the Moesian Platform southeast of the town of Varna. Three formal lithostratigraphic units were identified – Komarevo Formation (Thanetian), Avren Formation (uppermost Ypresian–upper Priabonian), and Ruslar Formation (Oligocene). New data on the lithology, stratigraphic and lateral relationships, as well as the thickness and internal structure of the units were obtained.
Geochemical study of biomarkers in Eocene coal from the Bourgas Basin
Authors: Apostolova Denitsa , Vuković Nikola , Sachsenhofer Reinhard , Stojanović Ksenija , Kostova Irena
Published: December 2024

An initial study of biomarker compositions of three coal samples from the Bourgas Basin is presented. Biomarkers were analyzed by gas chromatography–mass spectrometry (GC-MS) to assess organic matter source in the studied samples. The alkane distributions are dominated by long–chain n-alkanes (n-C27 to n-C31), usually found in higher terrestrial plants rich in cuticular waxes. The maximum relative intensity is determined at n-C31. Carbon preference index (CPI) values higher than 8.0 reflect a marked predominance of odd over even-numbered alkanes. The non-aromatic polycyclic hydrocarbons are dominated by hopanes, indicating microbial (bacterial) activity in the ancient swamp environment. The differences in the precursor vegetation are related to varying contributions of gymnosperms versus angiosperms during peat accumulation in the Bourgas Basin. The depositional environment was likely dynamic, with alternating oxidizing and reducing conditions.
Justice dedicated to sustainable development: mediation in cases of domestic violence
Authors: Franguloiu Simona
Published: December 2024

Mediation is one of the most innovative and useful methods of extinguishing criminal prosecution as a method of restorative justice. We also consider that it could be seen as a concretization of the principle of minimum state intervention in certain types of criminal cases, in the case of less serious offenses, leaving it up to the involved persons to decide whether or not to terminate a criminal case or to settle the case through the reconciliation form of mediation. Although there may be contrary opinions, which are of course well reasoned, to the effect that mediation would not be appropriate or useful in all situations (particularly in the case of domestic violence offenses), in our opinion, mediation must also be able to settle the criminal conflict in these situations, by virtue of the above-mentioned principle.
Reporte integrado: estudio de riesgos y oportunidades en empresas del sector energético latinoamericano
Authors: Simaro Jorge , Tonelli Omar Edgardo , Varela Francisco Javier , Calma Federico
Published: December 2024

El sector energético es una parte esencial del desarrollo que posibilita inversiones, innovación y nuevas industrias, motores de la creación de empleo, el crecimiento inclusivo y la prosperidad económica. El objetivo general de este trabajo es analizar los riesgos y oportunidades identificados en los reportes integrados del año 2021 de las tres empresas de energía eléctrica mejor rankea-das en el “Ranking de 500 empresas latinoamericanas”. Se utiliza un enfoque cualitativo mediante un estudio de casos múltiple con alcance descriptivo de las tres empresas seleccionadas por medio de la herramienta metodológica de análisis de documentos, registros, materiales y artefactos siendo la fuente de información datos secundarios de corte transversal obtenidos de los reportes integrados. Se toman como guía de análisis los riesgos y oportunidades revelados por las organizaciones en sus reportes, y se consideran los diferentes tipos de impacto (económico, social, ambiental y de gobierno corporativo), de acuerdo con el Marco Conceptual del IIRC de 2013 vigente para el período analizado. Los hallazgos demuestran que las tres empresas estudiadas cumplen con lo establecido en el Marco Conceptual del IIRC en lo que respecta a la divulgación de riesgos y oportunidades. Se observa la implementación de diferentes metodologías para identificar las fuentes específicas de riesgos y oportunidades con un alto grado de coincidencia en los riesgos identificados por las empresas, en su gestión y en el monitoreo periódico. Además, se destaca la conexión que existe entre la sección de “Riesgos y oportunidades” y el resto de las secciones que componen cada uno de los reportes de los casos analizados.
STATISTICAL SIMULATION OF RELIABILITY OF NETWORKS WITH EXPONENTIALLY DISTRIBUTED UNIT LIFETIMES
Authors: Rotaru Maria
Published: December 2024

In this paper, there were deduced three new lifetime distributions of serial-parallel and parallel-serial networks, their distribution being approached by means of analytical and Monte-Carlo methods. The novelty of the distribution consists in the fact that the number of subnets is random, governed by the Poisson and Logarithmic distributions, the lifetimes of the units in each subnet being independent, identically, exponentially distributed random variables, the number of units in each subnet is the same constant integer number. It was shown that the most important theoretical characteristics of lifetime for such networks, as the mean value, the variance, the survival/reliability function, my be approximated, with desired accuracy, by the same corresponding characteristics, as the sample mean value, sample variance, empirical survival/reliability function simulated by Monte-Carlo methods. Results are illustrated tabularly and graphically for some concrete examples.
PERFORMANCE REQUIRED FOR COMMON-USE COMPONENTS OF COMPUTER NETWORKS
Authors: Bolun Ion
Published: December 2024

Sometimes, in practice, simple solutions of quick preliminary estimation of basic characteristics of a computer network are needed. In this aim, the backbone subnet and server set of wide area computer networks are examined. Based on Jackson’s partitioning theorem and considering the linear dependence of the costs of channels, routers, and servers on their performance, a simplified analytical model for these components of the network is defined. Using this model, two optimization problems are formulated: minimizing the average response time to user requests of data processing and minimizing the summary cost of servers, channels and routers of the computer network. For both problems, analytical solutions regarding the necessary performances of channels, routers and servers are obtained. As expected, in the obtained analytical solutions, the equations for the optimization criteria of the two problems coincide, only their form being different. Calculations of performances according to these solutions are simple and can be done, for example, in MS Excel. Because the obtained in this way performances are positive real numbers, and the allowed performances of concerned entities are discrete ones, further adjustment of the solution in question, depending of the case, may be necessary. For such an adjustment, two algorithms are proposed. One of them solves the problem by reducing it to that of backpack. Another solves the problem based on the use of resource concentration rule.
INTEGRATION OF A DATA-DRIVEN SOFTWARE APPLICATION AND A MULTIMODAL LARGE LANGUAGE MODEL FOR ENHANCED NUTRITIONAL GUIDANCE: A CASE STUDY
Authors: Iapăscurtă Victor , Țurcanu Dinu , Siminiuc Rodica
Published: December 2024

In the realm of health and wellness, the integration of data-driven technology and artificial intelligence (AI) has opened up new possibilities for personalized and data-driven approaches. HN-Assistant, a software application designed to analyze an individual's nutritional state and provide tailored recommendations, offers a powerful tool for promoting healthy eating habits. The HN-Assistant can also analyze how good a food product is at covering the estimated nutrient requirements. However, when combined with the capabilities of advanced AI assistants based on LLMs, the potential for comprehensive and insightful nutritional guidance is taken to new heights. This paper describes an attempt at integrating the proprietary software application HN-Assistant with GPT-4o to empower final users to make better nutritional decisions. The application was built in R programming language using the Shiny package, and the interaction between HN-Assistant and GPT-4o is based on an API in Python.
ENSURING THE LONG-TERM STABILITY OF DEEP CUTTING SLOPES FORMED BY CLAY SOILS ON REPUBLIC OF MOLDOVA ROADS
Authors: Polcanov Vladimir , Polcanova Alina , Cîrlan Alexandru
Published: December 2024

The article presents research results on identifying the causes of landslide deformations along the M21 road, Brest-Chișinău-Poltava in the Republic of Moldova, using Maslov's physico-technical theory of creep, along with proposals for their stabilization. It highlights the geomorphological and geological characteristics contributing to landslide formation, focusing on the rheological properties of clayey soils. The studies included stability calculations based on laboratory investigations aimed at determining strength and rheological properties. Results demonstrated the dependence between soil moisture and structural cohesion, influencing landslide resistance and creep deformations. Proposed values for residual strength characteristics of clayey soils ensure long-term stability of deep excavation slopes without creep deformations, as well as values allowing economically feasible excavations with partial reduction of structural cohesion without compromising slope stability during operation.
EVALUATING THE ADSORPTION POTENTIAL OF SUGARCANE BAGASSE AND LEMONGRASS FOR CHROMIUM (VI) REMOVAL IN WASTEWATER TREATMENT
Authors: Dangamba Aminu S. , Oyegoke Toyese , Ocheje Favour E. , Dikko Mahmud A. , Galadima Mohammed S.
Published: December 2024

The increasing levels of chromium (VI) ions in textile wastewater pose significant environmental challenges, necessitating effective treatment methods. This study evaluates the biosorption potential of sugarcane bagasse (SCB) and lemongrass (LM), both individually and in blend form, for the removal of chromium (VI) ions. Batch adsorption experiments were conducted to assess the impact of contact time and adsorbent dosage on removal efficiency. BET analysis revealed that the blend had the highest surface area (1047.885 m²/g), enhancing its adsorption capacity, while FTIR spectroscopy identified key functional groups such as hydroxyl and carbonyl that facilitate metal binding. Results indicated that the blend exhibited superior adsorption capacity, with kinetic studies showing that the adsorption process followed a Pseudo-second order model, suggesting chemisorption as the dominant mechanism. Isotherm analyses indicated that the Langmuir model best-described adsorption on SCB, while the Freundlich model was more suitable for LM and the blend. This research recommends the practical application of SCB and LM in wastewater treatment and encourages further investigation into their potential for removing other heavy metals, highlighting a sustainable approach to environmental remediation.
CHARACTERISTICS OF BIOMASS RESULTING FROM AGRO-INDUSTRIAL PROCESSES AND POSSIBILITIES OF ITS EVALUATION IN THE CONTEXT OF THE CIRCULAR BIOECONOMY
Authors: Tașca Corina
Published: December 2024

Waste management in the agro-industrial sector is a significant issue that demands a thoughtful and multifaceted approach, not only to prevent environmental contamination with harmful substances but also to produce value-added products. The selection of waste treatment technology should be based on the waste's nature, composition, and initial quantities, which are determined by the primary production cycle, raw materials, and applied conditions. This study focuses on exploring innovative methods to enhance the conversion rate and efficiency of organic waste biomass by incorporating small amounts of biologically active substances into the fermentation mix. The research also examines the impact of natural plant-based additives on various types of biomass within the agro-industrial sector. In agricultural areas where industries produce wine, spirits, beer, and juices, liquid waste is continuously produced in a state of ongoing digestion. This requires strict measures to prevent its direct disposal into landfills, water bodies, or other environmental compartments, as such actions could disrupt the natural balance of soil microorganisms, plants, and other organisms. Present-day methods for handling solid organic waste often include its application in agriculture, incineration, anaerobic digestion, composting, and related processes. Liquid waste from the agro-industrial sector can be treated through processes like sedimentation, settling, and anaerobic fermentation.
ANTHOCYANINS – METHODS OF EXTRACTION AND STABILIZATION
Authors: Smerea Olga , Bulgaru Viorica
Published: December 2024

Anthocyanins, natural pigments present in plants which are of interest among researchers due to their antioxidant qualities and potential therapeutic advantages in certain contexts. Their occurrence in fruits, vegetables, and blossoms attributes to their unique hues. Once obtained, the dyes extracted from berries can serve as natural coloring agents in a variety of food items, displacing artificial dyes. Moreover, the antioxidative characteristics of anthocyanins position berry dyes as potential sources of functional components for creating healthier food alternatives. Overall, the extraction of pigments from berries shows considerable promise for both the food sector and health-conscious consumers. In this context, emphasis is placed on the identification of advantageous extraction methods from the point of view of the quality of the biologically active compounds obtained, the extraction yield and the impact of the respective methods on the environment. Directing the technological parameters for obtaining storage-stable phytochemical compounds is also important. The purpose of this paper is to deepen the methods of anthocyanin extraction, their advantages and disadvantages together with the condition of the berries subjected to the extraction processes. Moreover, it analyzes the stabilization methods of phytochemical compounds during storage and their use in the food industry.
ПРИМЕНЕНИЕ ПОЛЫХ ЗАГОТОВОК ДЛЯ ПРОИЗВОДСТВА ЖЕЛЕЗНОДОРОЖНЫХ КОЛЕС И ПОЛЫХ ВАГОННЫХ ОСЕЙ СПОСОБОМ ВИНТОВОЙ ПРОШИВКИ
Authors: Романенко В.П. , Фомин А.В. , Крискович С.В. , Севастьянов А.А. , Филиппов Г.А. , Илюхин Д.С.
Published: December 2024

The results of mechanical properties inspection were provided for very thick-walled shells (D/S ≈ 3.06 and D/S ≈ 3.1) made from wheel steel type T manufactured by skew piercing using experimental and industrial two-roll mill MISiS 130Д with the feed angle β = 12° / μ = 1.26 and β = 14° / μ = 1.36. When comparing the obtained mechanical properties results, it was noted that use of a larger feed angle (with β = 14° / μ = 1.36) piercing process appears to be more preferable for the purpose of improving the properties of initial hollow billets than the piercing process with β = 12° / μ = 1.26. The analysis of dimensions of very thick-walled shells made from wheel steel with the ratio of D/S ≈ 3.1 manufactured by piercing using the skew rolling mill MISiS 130Д showed high precision: outside diameter deviation ΔD = (–0.1 mm; +0.3 mm), inside diameter deviation Δd = (0; +0.4 mm), wall thickness deviation ΔS = (–0.3 mm; +0.2 mm). When manufacturing hollow billets made from axle steel to manufacture hollow car axles using the industrial Pipe Rolling Mill 70-270 (Vyksa Steel Works, JSC), we observed the positive effect of the skew piercing process (β = 12° / μ = 1.3) on strength, plastic properties, impact strength: percentage elongation (δ) (initial condition / as-pierced condition) was 38.9% / 41.9 MPa, impact strength KCU+20 was 63.3/72 J/cm2.
СИНТЕЗ СОЕДИНЕНИЙ С КРИСТАЛЛИЧЕСКОЙ СТРУКТУРОЙ СИЛЛЕНИТА В ПСЕВДОБИНАРНОЙ СТАБИЛЬНОЙ СИСТЕМЕ Bi12GeO20-Bi12SiO20
Authors: Бермешев Т.В. , Бундин М.П. , Залога А.Н. , Хлыстов Д.В. , Ворошилов Д.С. , Беспалов В.М. , Мазурова Е.В. , Самойло А.С. , Плотников И.С. , Юшкова О.В. , Губанова М.И.
Published: December 2024

Показана возможность частичного замещения Ge на Si в структуре Bi12GeO20 при синтезе его из расплава методом литья. Исследовано влияние замещения на структуру синтезируемого поликристаллического материала. С помощью рентгенофазового анализа и оптической микроскопии подтверждено, что стабильные силикат и германат висмута со структурой силленита образуют непрерывный ряд твердых растворов. Показана возможность частичного замещения Ge на Si в структуре Bi12GeO20 при синтезе его из расплава ускоренным охлаждением – метод литья.

The possibility of partial replacement of Ge by Si in the structure of Bi12GeO20 during its synthesis from a melt by the casting method is shown. The effect of substitution on the structure of the synthesized polycrystalline material has been studied. Using X-ray phase analysis and optical microscopy, it was confirmed that stable bismuth silicate and germanate with the sillenite structure form a continuous series of solid solutions. The possibility of partial replacement of Ge by Si in the structure of Bi12GeO20 during its synthesis from a melt by accelerated cooling (casting method) is shown.
ОПТИМАЛЬНЫЕ ПАРАМЕТРЫ КУЧНОГО ВЫЩЕЛАЧИВАНИЯ ОКИСЛЕННЫХ НИКЕЛЕВЫХ РУД С ПРИМЕНЕНИЕМ МЕТОДА КРУТОГО ВОСХОЖДЕНИЯ БОКСА-УИЛСОНА. Часть 1
Authors: Гаврилов А.С. , Крашенинин А.Г. , Петрова С.А. , Белозерова А.А. , Реутов Д.С.
Published: December 2024

Изучен вещественный состав железомагнезиальной окисленной никелевой руды Серовского месторождения. По результатам химического анализа установлено, что исследованная руда бедна по содержанию никеля. В качестве макропримесей в руде присутствуют магний и железо. Основные никельсодержащие минералы лизардит и клинохлор, в меньшей степени никель содержится в тальке. Для определения оптимальных технологических показателей кучного выщелачивания и выявления их корреляционной зависимости использован метод математической обработки данных – крутого восхождения Бокса-Уилсона. По результатам выщелачивания рассчитаны значения критерия эффективности, дисперсии критерия эффективности и построено уравнение регрессии, описывающее процесс выщелачивания. С помощью критерия Фишера установлена адекватность уравнения регрессии. Математическая обработка данных эксперимента показала, что концентрация серной кислоты в растворе, пауза между орошениями и удельный расход выщелачивающего раствора оказывают значительное влияние на эффективность выщелачивания на стадии извлечения никеля от 0 до 30%. На основе рассчитанных значений критерия эффективности определены значения переменных параметров для второго этапа поиска оптимальных условий выщелачивания, обеспечивающих эффективное вскрытие руды на этапе извлечения никеля до 30%.

The material composition of ferromagnesium oxidized nickel ore from the Serov deposit has been studied. Based on the results of chemical analysis, it was established that the ore under study is poor in nickel content. Magnesium and iron are present in the ore as macroimpurities. The main nickel-containing minerals are lizardite and clinochlore; nickel is found to a lesser extent in talc. To determine the optimal technological indicators of heap leaching and identify their correlation dependence, the method of mathematical data processing – Box-Wilson steep ascent – was used. Based on the leaching results, the values of the efficiency criterion and the variance of the efficiency criterion were calculated and a regression equation was constructed to describe the leaching process. Using the Fisher criterion, the adequacy of the regression equation was established. Mathematical processing of the experimental data showed that the concentration of sulfuric acid in the solution, the pause between irrigations and the specific consumption of the leaching solution have a significant impact on the efficiency of leaching at the stage of nickel extraction from 0 to 30%. Based on the calculated values of the efficiency criterion, the values of variable parameters were determined for the second stage of searching for optimal leaching conditions that ensure effective opening of ore at the stage of nickel extraction up to 30%.
Deformation of laboratory truncated disc samples with stress concentrators
Authors: Tsvik L.B. , Zenkov E.V. , Elovenko D.A. , Malomigev D.O.
Published: December 2024

The article assesses the structural strength of sample materials destroyed on standard equipment for determining the mechanical properties of materials. The distribution of mechanical stresses of laboratory disk samples with stress concentrators in the form of grooves on the support surfaces was analyzed. It was revealed that the disc truncation along the two symmetrical chords allows for varying the type of stress state in the sample and intensity of stresses in the working zone. The problems of the linear theory of elasticity were solved for samples with different degrees of disc truncation and with different geometric parameters of the groove profile. The analysis of disk deformation showed that these laboratory samples can be used in simulating the type and level of stress-strain state of various parts of machines and mechanisms. This factor significantly expands the possibilities for assessing the structural strength of materials during laboratory studies of the materials. It was revealed that the type of stress-strain state (SSS) plays a role in localizing the sources of destruction of highly loaded structural elements made from structural carbon steel St45. The results can be used both for the experimental assessment of the structural strength of materials and for constructing limit state equations corresponding to a SSS level and type.
Exploring stress intensity factor computation: A parametric study using extended isogeometric analysis (XIGA)
Authors: Zeleke Migbar Assefa , Ageze Mesfin Belayneh , Batane Ntirelang Robert , Dintwa Edward
Published: December 2024

The permanence and durability of mechanical and structural elements with discontinuities such as cracks and voids require the calculation of SIF (stress intensity factors) with reasonable fidelity. SIF is a crucial parameter that predicts crack growth and failure behavior by quantifying the stress field neighboring the crack tip. Therefore, understanding the sophisticated characteristics of the stress fields in the vicinity of discontinuity requires an effective way of calculating SIFs. Currently, there are numerous methods to calculate SIF, such as FVM (Finite Volume Method), FEM (Finite Element Method), BEM (Boundary Element Method), XFEM (Extended Finite Element Method), Phase field method and Meshfree methods. For an extended period, FEM is one of the leading methods in solving fracture mechanics problems. Though FEM is quite robust in dealing with several engineering problems, it has got its inherent drawbacks to deal with singular fields like discontinuities. Hence to reasonably capture moving discontinuities, finer meshes near the discontinuous field are required that demand more computation effort and time. To alleviate the above drawback of FEM, this study employed Extended Isogeometric Analysis (XIGA) to efficiently and effectively determine the SIFs in the case of fissured plates as benchmarking fissure problems. In this study SIFs in relation to crack length were examined for edge and center cracked plates and results were compared with the theoretical values.
Influence of process parameters for tensile test specimens printed on FDM by ABS material to attain sustainability
Authors: Venkatesh Kolusu , Krishna L. Siva Rama , Kumar A. Seshu
Published: December 2024

Additive Manufacturing (AM) is becoming the leading innovation in many fields due to its ease in generating a 3D object by adding one layer of material over the other from a source of Computer Aided Design (CAD) model as input file. Fused Deposition Modeling (FDM) is one among the technologies available in AM, which works on material extrusion process for which the material is served in filament shape. The practice of utilizing the resources effectively by meeting the requirements of subsequent generations is internationally referred to as Sustainable Manufacturing (SM). It deals with the issues that impact the economy, society and environment. Green manufacturing approaches like reduce, reuse and recycle theories are linked with 3D Printing. In this paper research has been conducted on the studies of sustainability of the parts produced on FDM for ASTM D638 Type- IV standard tensile test specimen to optimize the process parameters for Acrylonitrile Butadiene Styrene (ABS) material by using Design of Experiments (DOE) through Taguchi technique and Analysis of Variance (ANOVA). The variables considered are print speed, orientation, layer thickness and print temperature and the responses studied are energy consumption, CO2 emission, dimensional accuracy, surface roughness and mechanical properties. The primary aim of this research is to reduce the energy consumption and CO2 emission without compromising mechanical properties, in order to achieve sustainability by finding the optimum values for the input process parameters.
A model based system engineering approach for CubeSat structure and configuration management with highly constrained system design
Authors: Abbasy Mansoureh , Ghazanfarinia Sajjad , Amini Kimia , Motaaleghi Mohammad Aghayi
Published: December 2024

This paper reviews context and results of a software tool, named SaTrade, for Model Based System Engineering in System Design of a CubeSat. This tool helps designers to go through system design trade offs easily in System and Subsystem Levels. To achieve this, Modeling for subsystem design has been made using Block Diagram Definitions and implemented in codes with Inputs from System Design and Outputs to Subsystem specifications and Design Integration. Another Feature of SaTrade is change and modification control and management, where it can be from Requirements or other Inputs from System Design or Interfaces. Changes will be affected on the System Design to allow the Designers follow the process by simulations for Integrity check and Evaluation. The first version of SaTrade focuses on Satellite Structure Design and Configuration Management more, using its Neural Network Algorithms dedicated for this purpose, however, it is intended to make paperless automated design available for the whole CubeSat System in the next version.
Mathematical modelling of torsional vibrations of a truncated conical shell located in an elastic medium
Authors: Khalmuradov Rustam , Khudoynazarov Khayrulla , Ismoilov Khursand
Published: December 2024

In this article, mathematical modelling of torsional vibrations of a truncated circular conical shell located in an elastic medium is carried out. It is believed that the shell is exposed to external dynamic loads, and its material is homogeneous and isotropic. Based on the exact mathematical formulation of the problem, general equations of nonstationary torsional vibrations of a truncated conical shells have been developed, from which, in particular cases, the equations of vibration of a truncated conical rod, as well as a circular cylindrical shell and a round rod follow. The desired functions found by solving the vibrational equations are used to construct a method for computing the stress-strain state of any point in the system under investigation. As an example.
The Effect of Job Satisfaction on Employee Retention
Authors: Hulu Winer Berkat Jaya , Telaumbanua Eliagus , Halawa Odaligoziduhu , Mendofa Yupiter
Published: December 2024

This study aims to determine whether job satisfaction influences employee retention at CV. Golden Mart and to measure the extent of this influence. The research problem addressed is whether job satisfaction significantly affects employee retention in this organization. A quantitative research approach was employed, involving statistical analysis to draw conclusions. The population of this study consists of all 30 employees of CV. Golden Mart, and the entire population was used as the sample. Data collection utilized both primary and secondary sources. The findings of this study indicate that job satisfaction has a positive effect on employee retention. This conclusion is supported by data processing results showing a significance value (Sig.) of less than 0.05. The reliability test demonstrated Cronbach's Alpha values of 0.886 for the job satisfaction variable and 0.842 for the employee retention variable, indicating that both variables are reliable as their Cronbach's Alpha values exceed 0.6. Furthermore, autocorrelation analysis using the runs test method yielded a value of 0.041, suggesting no autocorrelation in the data since the significant value exceeds 0.05. The coefficient of determination (R Square) was calculated at 0.787, indicating that 79% of employee retention can be explained by job satisfaction. The t-test results further confirmed that the alternative hypothesis (Ha) is accepted, and the null hypothesis (Ho) is rejected, affirming a significant influence of job satisfaction on employee retention at CV. Golden Mart in Gunungsitoli. The analysis also highlights specific indicators of job satisfaction and employee retention. For the job satisfaction variable, the strongest indicators include supervision, wages/salary, and coworker relationships, while weaker indicators are job characteristics and promotion opportunities. Regarding employee retention, the most prominent indicators are organizational components, rewards, and employee relations, whereas career opportunities and job design are the least significant. These findings provide valuable insights into the relationship between job satisfaction and employee retention at CV. Golden Mart.
Analysis of Financial Statements to Assess Financial Performance
Authors: Nawawi N.
Published: December 2024

This study aims to analyze the financial performance of PT Unilever Indonesia Tbk during the 2020–2023 period by using a financial ratio analysis method which includes liquidity ratio, solvency, activity, and profitability. The data used is secondary data from the company's annual financial statements. The analysis method applied is horizontal analysis to compare financial performance between periods. The results of the study show that the liquidity ratio tends to decrease, indicating that the company's ability to meet short-term obligations is decreasing. Solvency ratios are increasing, indicating an increased reliance on external financing that can increase financial risks. The activity ratio shows fluctuating efficiency in asset use and receivables management, while the profitability ratio decreases consistently, reflecting a decrease in the company's efficiency in generating profits.
Factors Affecting Tax Aggressiveness Case Study of Manufacturing Companies Listed on the IDX
Authors: Wati Asnandi , Astuti Tutut Dewi
Published: December 2024

Tax aggressiveness is the engineering of taxable income through tax planning efforts by a company, either by using legal tactics (tax avoidance) or criminal (tax evasion). The purpose of this study is to examine the factors that affect tax aggressiveness in manufacturing companies listed on the Indonesia Stock Exchange (IDX). The variables used in this study are company size, corporate governance, liquidity, leverage, and fixed asset intensity. The population in this study is manufacturing companies listed on the Indonesia Stock Exchange for the period 2020 to 2022. The sample of this study was selected using the purposive sampling method and data were taken from 13 samples. The results of this study show that the size of the company, corporate governance, has a significant effect on tax aggressiveness. Leverage, the intensity of fixed assets, affects tax aggressiveness. Meanwhile, liquidity has no effect on tax aggressiveness.
The Role of the Heritage Center Against the Embezzlement of Assets by Guardians of Minors: Study at the Medan Heritage Center
Authors: Siahaan Shinta Romaito , Habeahan Besty
Published: December 2024

The heritage center (BHP) plays a central role in safeguarding and managing inheritances, especially for minors who are not yet able to manage their own assets. BHP was established in 1624 by the Dutch Government, with the aim of protecting the assets of the deceased, especially for orphans and those under guardianship. In Indonesia, BHP is under the Directorate General of General Legal Administration, Ministry of Law and Human Rights, with authority regulated through various legal regulations. One of the main roles of BHP is to supervise guardians, as stipulated in Article 366 of the Civil Code, who are responsible for managing the assets of minors who are not under parental supervision. This study aims to evaluate the role of BHP in preventing misuse of minors' assets by guardians, as well as identifying obstacles faced in carrying out supervision. Using normative methods through literature studies, this study analyzes the legal aspects underlying the function of BHP. The results of the study indicate that BHP plays an important role in supervising the management of children's assets through inventories and annual reports by guardians. However, cases of misuse of assets by guardians still often occur due to weak supervision and loopholes in the legal system.
«Երի, երի յանդըմ» ժողովրդական երգի սոցիալ-տնտեսական հենքի մասին
Authors: Պետրոսյան Լուսինե
Published: December 2024

Հոդվածում ապացուցվում է, որ ի դեմս «Երի՛, երի յանդըմ» երգի գործ ունենք ոչ թե սիրահար զույգի պարզ երկխոսության հետ, այլ շատ ավել խորքային՝ սոցիալ-տնտեսական հենք ունեցող պարերգի տեքստի հետ: Նրանում առկա են հետքերը հազարամյակներ առաջ գոյություն ունեցած հայկական ցեղի երկմիասնական կառույցի, երբ ցեղը բաղկացած էր արտամուսնական (էքսոգամ) կապ ունեցող երկու տոհմից՝ ընկալված՝ մեկը արական, մյուսը՝ իգական։
Прелюдия армянской народной песнопляски «Ери, ери яндым» сохранило основную часть своего прототипа. Песня была создана за тысячелетия до нашей эры, когда армянские племена, т.е племена армяноязычной этнической принадлежности, в социально-экономическом отношении состояли из женщин-земледельцев и мужчин-скотоводов.
The prelude of the Armenian folk song-dance “Yeri, yeri yandom” has preserved the main part of its prototype. The song was created millennia B.C., when Armenian tribes, i.e. tribes of Armenian-speaking ethnicity, were socio-economically composed of women farmers and men herders.
Արցախի երաժշտական մշակույթի պատմության էջերից (առաջին մաս)
Authors: Աղայան Ռիտա , Պարսյանց Գեղանուշ
Published: December 2024

Դարեր շարունակ Արցախը Հայկական լեռնաշխարհի անբաժան մասն է եղել իր ինքնատիպ ժողովրդով և բնաշխարհով, հազարամյակների պատմությամբ, նիստուկացով, հոգեկերտվածքով ու մշակույթով: Արցախի արվեստի և մշակութային գործունեության անըստգյուտ ձևերից է երաժշտությունը, որն իր ոճական, թեմատիկ ու ժանրային բազմազանությամբ, հայ բազմադարյա երաժշտության անքակտելի մասն է, Արցախ-Հայաստան հոգևոր միասնության և ընդհանուր մշակութային դաշտի անհերքելի ապացույցը:
For centuries, Artsakh has been an integral part of the Armenian highlands with its unique people and nature, millennia of history, spirituality and culture. Music is one of the important components of arts and cultural identity of Artsakh, which, with its stylistic, thematic and genre diversity, is an inseparable part of centuries-old Armenian music, an undeniable proof of Artsakh-Armenia spiritual unity and common cultural field.
На протяжении веков Арцах со своими уникальными людьми и природой, тысячелетней историей и культурой был неотъемлемой частью Армянского нагорья. Музыка – одна из уникальных форм художественной и культурной деятельности Арцаха, которая своим стилистическим, тематическим и жанровым разнообразием является неотъемлемой частью многовековой армянской музыки, неоспоримым доказательством единого духовного и культурного единства Арцаха и Армении.