bluuebunny/crossref_metadata_2025 huggingface dataset:
Percepciones del alumnado sobre la historia alternativa como herramienta de aprendizaje: un análisis de caso en 4º de ESO
Authors: Fraile-Delgado Francisco J.
Published: December 2023

Las más recientes investigaciones en didáctica de la historia han puesto de manifiesto la importancia del desarrollo del pensamiento histórico como base en la enseñanza de la materia. Teniendo en cuenta esto, en este trabajo se plantea indagar en las percepciones del alumnado acerca del uso de la historia contrafáctica como herramienta de aprendizaje, orientado a una mejor adquisición de las habilidades asociadas al pensamiento histórico, así como estimular su motivación. Para ello se ha optado por una investigación cualitativa y el análisis de caso de un grupo de 16 alumnos de 4º ESO que explora las percepciones de los participantes a través de un cuestionario semiestructurado a partir de un análisis de contenido. Los resultados muestran las percepciones del alumnado sobre la historia alternativa relativas a la comprensión de los contenidos, el desarrollo competencial y la mayor motivación. En este sentido, y a pesar de las dificultades que puedan encontrar, la historia alternativa como herramienta didáctica puede constituirse como una práctica complementaria de gran interés para la comprensión y el aprendizaje de la historia.
Egipto, civilización enigmática: análisis de "El asombroso juego de Zamba y sus amigos: Egipto"
Authors: Urbano Luciana , Alvarez Maria Silvia
Published: December 2023

En este trabajo nos proponemos llevar adelante un análisis histórico y didáctico de “El asombroso juego de Zamba y sus amigos: Egipto”, estrenado por la cadena de televisión PakaPaka en diciembre de 2016. El episodio comienza con una pregunta de la Señorita Silvia: “¿Quién puede decirme a orillas de qué río nació y se desarrolló la civilización egipcia?” Ese es el enigma semanal que el “equipo asombroso” resolverá en un juego de tres niveles, en el que tienen que rescatar las coronas del Alto y del Bajo Egipto. Teniendo en cuenta que la serie de Zamba está destinada a niñas y niños a partir de los 10 años, por lo que muchas/os de ellas/os aún no se han acercado al conocimiento de la sociedad egipcia en sus escuelas y esta será su primera aproximación, nos preguntamos cuáles son los conocimientos que se trasmiten y de qué manera, cuál es la visión que se construye en este episodio sobre el antiguo Egipto, cuáles son las estrategias didácticas que se ponen en juego.
Comparative Analysis of the Use of Nanosilica and Fly Ash in Hydraulic Concrete
Authors: Solache de la Torre Sara Cristina , Delgado-Hernández David Joaquín , Arteaga-Arcos Juan Carlos
Published: December 2023

Context: Nowadays, nanomaterials constitute an innovative alternative for the construction sector. This study evaluates the benefits of adding nanosilica and fly ash to Portland cement concrete in terms of its mechanical strength properties.
Methodology: 45 specimens were used to compare the compressive strength and durability of concrete mixtures with nanosilica and fly ash. The specimens were studied after 7, 14, and 21 days to determine their maximum resistance.
Results: The addition of small amounts of nanosilica (up to 1%) significantly improved the compressive strength of the concrete. In contrast, a large amount of fly ash (up to 8%) was required for a noticeable effect.
Conclusions: Concrete with nanosilica yielded the best results in terms of mechanical strength. The key to improving concrete through nanosilica and fly ash is to reduce the water-to-cement ratio using chemical agents that reduce porosity and increase resistance.
Study Of the Effect of Titanium Additions on The Mechanical and Corrosion Properties of AISI 316 Powder Metallurgical Steel
Authors: Cañas Mendoza Luz Adriana , Pineda-Triana Yaneth , Mujica Roncery Lais
Published: December 2023

Context: Powder metallurgy uses metallic and/or non-metallic powders that, through mixing, compacting, and sintering operations, allow obtaining large series of products. In austenitic stainless steels, Cr23C6-type carbides can precipitate at temperatures between 450 and 950 °C. When this occurs, the steel is susceptible to being attacked at its grain boundaries by a phenomenon called sensitization. Titanium is added as a ‘stabilizer’ because it has a greater affinity with carbon for the formation of species at a temperature of approximately 900 ºC, and, during cooling, it consumes the carbon forming MC-type carbides, inhibiting the precipitation of Cr23C6.
Method: The composition and morphology of the powders were characterized, leading to the formulation of an alloy matrix consisting of a mixture of AISI 316 steel powders of two different particle-size distributions in a proportion that produced the highest density and the lowest porosity in the sintered material. Titanium was added at two levels (0,4 and 1,0 wt%), and sintering was carried out with nitrogen. The corrosion rate was determined by potentiodynamic polarization. Vickers hardness and pin-on-disk wear tests were performed. The stages were complemented with a microstructural analysis.
Results: The addition of 0,4 wt% of titanium decreased the steel’s rate of corrosion, albeit in the absence of passivation. The microstructure consists of austenite, ferrite, and TiC precipitates. The addition of 1,0 wt%Ti showed an increase in the corrosion rate, with a microstructure containing austenite, ferrite, TiC carbides, and the Laves ɳ-Fe2Ti phase.
Conclusions: The results were compared against thermodynamic simulations in the Thermo-Calc software, which were consistent with the microstructural analysis, showing the phenomena of stabilization as well as the precipitation of intermetallic phases and highlighting the importance of establishing strict controls in the formulation of powder metallurgical alloys due to the transformations that can take place due to the effect of the thermal cycles of the process.
Performance Analysis of a Backward/Forward Algorithm Adjusted to a Distribution Network with Nonlinear Loads and a Photovoltaic System
Authors: Martinez-Peñaloza Alejandra , Ordóñez-Plata Gabriel , Osma-Pinto German Alfonso
Published: December 2023

Context: The backward/forward (BF) algorithm is a sweep-type technique that has recently been used as a strategy for the power flow analysis of ill-conditioned networks. The purpose of this study is to evaluate the performance of the BF algorithm compared to that of a computational tool such as Simulink, with both strategies adjusted to the operating conditions of a distribution network with nonlinear components (loads and photovoltaic system), unbalanced loads, and harmonic distortion in the voltage and current signals.
Method: The study case is a low-voltage distribution network with a radial topology, unbalanced loads, and nonlinear components. The BF algorithm is adjusted to consider two approaches of the Norton model: a coupled admittance matrix and a decoupled admittance matrix. The latter is also used in the network model created in Simulink. The performance of the algorithm is evaluated by analyzing 18 operation scenarios defined according to the presence and use intensity of the loads and solar irradiance levels (low and high).
Results: In general, the three strategies could successfully determine the waveform and RMS values of the voltage signals with errors of less than 0,8 and 1,3%, respectively. However, the performance of the strategies for the estimation of current signals and power parameters shows errors of 5-300% depending on the level of solar irradiance at which the photovoltaic system operates.
Conclusions: The results show that the BF strategy can be used to analyze unbalanced power grids with increasing penetration of renewable generation and the integration of nonlinear devices, but the performance of this strategy depends on the load model applied to represent the behavior of nonlinear devices and generation systems.
Friends’ Impact on Learners’ Motivation to Learn the English Language
Authors: Al-dalawi Valan , Omar Fouad R. , Mahmood Maysaa A. , Mustafa Akam A.
Published: December 2023

Motivation is vital in specifying learners' willingness and eagerness to communicate. Also, can be a blend of effort, longing to gain the goal of acquiring the language, and positive perceptions of learning the language. This study aims to investigate the impact of friends on Kurdish EFL learners’ motivation to learn the English language and to understand the extent to which they improve their language proficiency through friends. To achieve this, a questionnaire was utilized to collect the necessary data from 80 students in college of Education/ English Language Department/Knowledge University. The questionnaire contained 25 items aimed to explore their attitudes regarding their friends’ role in motivating them to learn English. The data was analyzed through Microsoft Excel to provide in-depth results. The findings of the study revealed that friends have a role in motivating their peers to learn and improve their English language proficiency. Moreover, the results showed that learners can acquire the language better when they speak English with their friends. Concerning improving learners’ language skills, the findings also indicated that friends could create a friendly environment for practicing the language. Additionally, the study demonstrated that students prefer learning and practicing the English language with the support of their peers rather than teachers.
The Economics of Behavioral Finance and its Effects on Investment Decisions in Kurdistan Region of Iraq for the Period 2020-2022
Authors: Mohammad Emad A. , Salhy Bana B.
Published: December 2023

This quantitative research aims to examine the influence of behavioral biases and financial education on investment choices made by residents of Kurdistan Region of Iraq. The research used regression analysis to look at the connection between behavioral biases, financial literacy, and investment choices among 200 regional investors. Investment choices in the region were found to be significantly influenced by behavioral biases, including loss aversion and overconfidence. It was also discovered that investors with higher degrees of financial education were less vulnerable to behavioral biases, suggesting that financial education had a positive impact on investment behavior. Statistical significance between behavioral biases, financial literacy, and investment choices was indicated by a p-value of less than 0.05 in the regression analysis. The research found that investing decisions in the Iraqi Kurdistan area were greatly influenced by cognitive biases. This research shows that financial education is crucial for reducing the impact of behavioral biases and increasing the likelihood of making well-informed investing choices. To enhance investment behavior and lessen the effect of behavioral biases on investment decisions, the study suggests implementing financial education. The results have substantial ramifications for regulators, banks, and individuals in the region who are interested in influencing investment patterns and expanding access to financial services as well as literacy programs. By empowering individuals to make educated investment decisions, these types of programs have the potential to expand access to financial services and stimulate regional economies.
ANXIETY AND UNCERTAINTY MANAGEMENT: LIGHTS AND SHADOWS OF INTERNATIONAL STUDENTS IN INTERCULTURAL COMMUNICATION AT DIPONEGORO UNIVERSITY IN SEMARANG
Authors: Hamenyimana Silas , Sulistyani Hapsari Dwiningtyas , Rahardjo Turnomo , Rahardjo Turnomo
Published: December 2023

The aim of this study is to explore and interpret the significant challenges experienced by international students and the strategies used to cope with them in managing their anxiety and uncertainty in intercultural communication settings at Diponegoro University. A sample size of five students was purposively selected and participated in the data collection using in-depth and semi-structured interviews. The data were analyzed qualitatively using Interpretative Phenomenological Analysis. Through their lived experiences, we realized that majority of participants were clueless about the Indonesian language and Indonesia/ Javanese culture in which some of them faced anxiety and uncertainty challenges in their arrival et during their initial interaction, and adaptation process challenges based chiefly on language anxiety and uncertainty; new culture and environment in communication and interaction with the inside and outside the campuses. They coped with their anxiety and uncertainty by accepting host culture’s lifestyle, friendships, learning the Indonesian language, attending prayers at Mosques, hanging out with friends, and self-learning. Additional learning materials such as dictionaries, google translate, watching the news, books, family assistance, and listening to music were added to overcome their linguistic anxiety and uncertainty. The motivation from lecturers, classmates, and local people to learn a new language was valuable.
SISTEM MONITORING DAN PERLINDUNGAN TANAMAN DARI GANGGUAN HEWAN BERBASIS INTERNET OF THINGS
Authors: Samriadi Andi , Alamsyah Alamsyah
Published: December 2023

Jagung merupakan komoditas pertanian yang banyak dibudidayakan di Indonesia. Namun permasalahan yang muncul adalah hewan ternak milik masyarakat seperti babi, kambing, ayam dan sapi seringkali memasuki ladang jagung petani pada kondisi tidak terjaga. Tidak adanya informasi yang diperoleh membuat petani menjumpai tanaman dalam kondisi rusak saat kembali ke ladang.  Penelitian ini bertujuan untuk membantu dan mempermudah petani dalam memonitoring dan melindungi kebun dari gangguan hewan ternak yang masuk dari jarak jauh melalui smartphone dengan menggunakan data telegram. Aplikasi ini dapat membantu petani dalam mengambil tindakan untuk meminimalisir potensi kerusakan tanaman. Penelitian dirancang menggunakan raspberry pi model 3 B+ sebagai perangkat utama pengolah data, sensor RCWL-0516 untuk mendeteksi gerakan, night vision kamera raspberry pi untuk memonitoring objek, you only look once (YOLO) v4 tiny sebagai sistem deteksi hewan penganggu tanaman, speaker sebagai output keberhasilan deteksi, dan bot telegram sebagai informasi hasil monitoring. Hasil penelitian menunjukkan bahwa sensor RCWL-0516 dapat mendeteksi gerakan secara maksimal pada jarak 4 meter. Akurasi deteksi model YOLO  pada night vision kamera sebesar 88%. Selanjutnya hasil integrasi deteksi ke speaker dan bot telegram sebesar 100%. Secara keseluruhan sistem dapat bekerja dengan baik dalam mendeteksi gerakan dan memonitoring objek  yang ditampilkan pada bot telegram
PERANCANGAN SISTEM PEMANTAUAN KONDISI TEMPAT SAMPAH KAMPUS BERBASIS INTERNET OF THINGS (IOT) (STUDI KASUS : FAKULTAS SAINS DAN TEKNOLOGI UIN SUSKA RIAU)
Authors: Firmansyah Dheka , Ullah Aulia , Faizal Ahmad , Zarory Hilman
Published: December 2023

Pemantauan manual tempat sampah di kampus terbukti kurang efisien. Selain menghabiskan lebih banyak waktu, cara tersebut berisiko menimbulkan penumpukan sampah yang berpotensi membahayakan kesehatan. Untuk mengatasi masalah ini, studi ini merancang sebuah sistem pemantauan berbasis Internet of Things (IoT). Sistem ini memanfaatkan sensor HC-SR04 untuk mendeteksi kapasitas sampah, DHT22 untuk kelembapan, dan MQ135 untuk gas amonia. Informasi dari sensor dikirim secara realtime melalui platform Thingspeak dan notifikasi Whatsapp, sehingga memungkinkan petugas kebersihan melakukan pemantauan dari jarak jauh. Pengujian menunjukkan ketepatan sensor dalam mendeteksi kondisi sampah dan kecepatan notifikasi yang efisien. Berdasarkan hasil pengujian, sistem ini memiliki keunggulan signifikan dalam efisiensi waktu dan akurasi dibandingkan dengan metode pemantauan manual. Kesimpulannya, sistem berbasis IoT ini menawarkan solusi efektif untuk memantau kondisi tempat sampah, memfasilitasi respons cepat dari petugas kebersihan, dan berpotensi meningkatkan kualitas lingkungan kampus.
SISTEM DETEKSI MASKER PADA WAJAH MENGGUNAKAN CONVOLUTIONAL NEURAL NETWORK ARSITEKTUR VGG16
Authors: Ushuludin Mohammad , Haviana Sam Farisa Chaerul , Subroto Imam Much Ibnu
Published: December 2023

Pandemi COVID-19 telah mengubah paradigma global terhadap kesehatan dan kebersihan lingkungan. Penyakit yang disebabkan oleh SARS CoV-2 telah menimbulkan dampak serius di seluruh dunia. Di Indonesia, penanganan pandemi ini melibatkan berbagai peraturan dan upaya pencegahan, termasuk penggunaan masker sebagai langkah penting. Selain karena pandemi tersebut penggunaan masker juga sangat penting dilakukan di area tertentu misalnya rumah sakit. Penggunaan masker oleh dokter dan perawat saat merawat pasien sangatlah krusial untuk melindungi mereka dan mencegah penyebaran droplet penyakit. Meskipun penting, tingkat kepatuhan terhadap penggunaan masker di rumah sakit masih bervariasi. Penelitian ini mengembangkan sistem deteksi masker pada wajah menggunakan metode convolutional neural network (CNN) arsitektur VGG16. Sistem deteksi masker ini dapat memberikan alternatif teknologi bagi petugas dalam mengawasi dan memantau penggunaan masker pada individu di lingkungan rumah sakit atau tempat-tempat lain yang memerlukan penggunaan masker sehingga membantu efisiensi pengecekan serta pengurangan beban kerja.  Melalui pengujian dan evaluasi, ditemukan bahwa penggunaan threshold rendah sebesar 0.5 pada sistem deteksi masker memberikan hasil prediksi yang lebih akurat dengan tingkat akurasi mencapai 90% dan f1-score 0,909. Pengaturan threshold ini memungkinkan sistem menjadi lebih sensitif dalam mengenali apakah seseorang menggunakan masker atau tidak.
Wykonywanie zadań publicznych jako determinanta podmiotowych granic publicznego prawa podmiotowego dostępu do informacji publicznej
Authors: Jakimowicz Wojciech
Published: December 2023

The study concerns the subjective limits of the public subjective right to public information. It attempts to answer the question of the addressee of the claim characterizing this right in the Polish legal order from the perspective of constitutional regulations and the provisions of the Act on Access to Public Information. The analysis focuses on the interpretation of the statutory concepts of “public tasks” and “entity performing public tasks” using the method of doctrinal interpretation as necessary in this respect. At the same time, such an understanding of doctrinal interpretation was adopted, according to which it is an interpretation carried out  in the process of implementing the law, i.e. in specific circumstances, by the entity implementing this law and made from the point of view of the science of law, i.e. when referring to scientific arguments in the justification of the position and proposed solutions presented. For this reason, the results of the doctrinal interpretation of the terms “public task” and “entity performing public tasks” were also referred to the views presented in the jurisprudence of administrative courts. The analysis led to the conclusion that an “entity performing public tasks” within the meaning of the Act on Access to Public Information can be spoken of when the obligation to act    of a specific entity corresponding to the content of the public task is anchored in     a legal norm addressed to this entity, and the responsibility for its implementation is borne by the public-law community (state, self-government communities), of which this entity becomes a body in the functional sense. At the same time, this analysis justifies the conclusion that the theoretical constructions of administrative law, apart from their obvious scientific value, also have operational significance, and the need or even necessity to use the method of doctrinal interpretation in the area of this law seems obvious.
Five key differences between chambers of commerce in United Kingdom, Belgium and Poland
Authors: Marciniak Piotr
Published: December 2023

Chambers of commerce play an important role for entrepreneurs and the economy. However, their position, organization, effectiveness and tasks vary from country to country. The challenges of the 21st-century economy require the strengthening of chambers so that they can effectively support business. We should look for possible improvements. Chambers are usually categorized into three main models: Anglo-Saxon, continental and mixed. An additional public (or administrative) model is sometimes added. The analysis of the literature shows, however, that the assignment of chambers to models is sometimes arbitrary or customary. This results in different classiﬁcation of some countries into speciﬁc models – e.g. Poland is assigned to the Anglo-Saxon or mixed model, while Spain is placed in the continental model, although some features of their chambers indicate the properties of the mixed model. The systematic confusion stems from the fact that the current taxonomy is too general to address effectively some of the most important differences between chambers operating in more than 200 countries. But more important is that its design does not provide tools and information that (in the increasing complexity of today’s economy) could support the development of chambers based on the results of comparative research. This article outlines a set of the key differences between British, Polish and Belgian chambers of commerce with several references to Canadian and US chambers. They are all private law and generally listed as Anglo-Saxon model members. But there are major differences between them. It’s important to examine foreign systems when changes to the domestic chambers are considered. It should be clear that there is no single and common framework that can be just replicated. Each country’s history, economy and social norms must be considered before changes are made. This is why comparative studies are the key to ﬁnding the best improvements for local needs.
Monika Horáková, Depolitizace – nesplněný cíl zákona o státní službě (Depolityzacja – niespełniony cel ustawy o służbie cywilnej), „Acta Iuridica Olomucensia” 2022, vol. 17, no. 3
Authors: Dąbrowski Karol
Published: December 2023

Przegląd wybranych czasopism zagranicznych: Monika Horáková, Depolitizace – nesplněný cíl zákona o státní službě (Depolityzacja – niespełniony cel ustawy o służbie cywilnej) „Acta Iuridica Olomucensia” 2022, vol. 17, no. 3, s. 62–70.
Numerical Solution of the Fokker-Planck Equation Using Orthogonal Collocation
Authors: Lima William Junio , Lobato Fran Sérgio
Published: December 2023

This study aims to propose a numerical methodology to solve the Fokker-Planck Equation using the Orthogonal Collocation Method. In this approach, the original problem, represented by a partial differential equation, is rewritten as a system of initial value equations via discretization of spatial variable. The resulting system is integrated considering the Runge-Kutta-Fehlberg Method. The proposed methodology is applied in three case studies that presented an analytical solution. The obtained results demonstrate that the proposed approach is a good alternative for solving this class of problems.
Keywords: Fokker-Planck Equation, Orthogonal Collocation, Numerical Method.
Vertical mixing strategies in the Opendrift platform: analytical solution and Random Walk scheme
Authors: Souza Nikolas Gomes Silveira de , Lugon Jr Jader , Silva Neto Antônio José da
Published: December 2023

Predicted scenarios for microplastic displacement in the ocean is still a challenging task, where particle trajectory evolution is based on stochastic strategies at each timestep. The Opendrift platform presents a microplastic trajectory evolution solution using two strategies for turbulent vertical mixing. This work simulated microplastic particles emission in the Rio de Janeiro region (Guanabara Bay) and observed its depth over one year. Attentive to subtle differences, a statistical analysis was proposed to observe how particles are affected by the strategies individually. The preliminary observations showed no significant modification on the surface, but the depth had important motion modification. A dispersion was observed in XY coordinates of each particle using statistical analysis. The results demonstrated significant individual movement of microplastic particles. This study encourages the need for a protocol to decide which strategy to be used in computational simulations so that monitoring tasks can have optimum efficiency.
Utilização de Redes Neurais Convolucionais Recorrentes na previsão meteorológica de curto prazo (nowcasting) utilizando imagens de radar da cidade de Chapecó-SC
Authors: Copceski Rossatto Felipe , Pereira Härter Fabricio , Hideiti Shiguemori Elcio , Calvetti Leonardo
Published: December 2023

Neste trabalho, propõe-se uma nova abordagem computacional que faz uso de Redes Neurais Convolucionais Recorrentes, na qual imagens de radar meteorológico são utilizadas para a previsão de propagação e intensidade de tempestades com até 3h de antecedência, conhecida como nowcasting. Para tal, utilizou-se imagens do radar meteorológico localizado na cidade de Chapecó-SC. Esses dados são públicos e estão disponíveis no site do Instituto de Pesquisas Espaciais do Brasil (INPE). Para isso, é proposta a avaliação do emprego de uma rede neural convolucional recorrente de aprendizagem espaço temporal chamada PredRNN++. Os resultados foram validados através de estudos de casos de tempestades ocorridas na região de cobertura do radar utilizado. Para avaliar a performance da rede neural, além de uma análise visual dos resultados, foram utilizadas as métricas RMSE e SSIM. Os resultados mostram que a PredRNN++ foi capaz de simular o formato e local onde ocorreu o sistema meteorológico.
Identificação de danos estruturais empregando modelos de funções exponenciais, transformação integral e inferência Bayesiana
Authors: De Andrade Renan Pinto , Stutz Leonardo Tavares , Knupp Diego Campos
Published: December 2023

O presente trabalho aborda o problema inverso de identificação de danos estruturais em uma viga de Euler-Bernoulli. No modelo direto, o campo de dano estrutural é descrito de forma continua por funções de base exponenciais e a resposta dinâmica do modelo é obtida por meio de uma solução híbrida (analítica-numérica) fornecida pela Transformada Integral Generalizada. O problema inverso de identificação de danos é formulado segundo a inferência Bayesiana e o método Transitional Markov Chain Monte Carlo é utilizado para a amostragem da função densidade de probabilidade a posteriori dos parâmetros incertos que descrevem o campo de dano. A verificação da metodologia proposta é feita a partir de simulações numéricas considerando uma viga de Euler-Bernoulli simplesmente apoiada de modo que três cenários de dano distintos são analisados.
Validação e verificação de modelo numérico para simulação do princípio de funcionamento do coluna de água oscilantedo
Authors: De Oliveira Sersana Sabedra , Antunes Pinto Junior Edis , Oliveira Rocha Luiz Alberto , Domingues dos Santos Elizaldo , André Isoldi Liércio
Published: December 2023

Resumo: O presente trabalho apresenta a validação de um modelo computacional empregando a Metodologia Ar para a simulação numérica de um conversor de energia das ondas do mar em energia elétrica do tipo Coluna de Água Oscilante (CAO), através de resultados experimentais de um escoamento turbulento sobre um degrau descendente, característica essa que se assemelha ao escoamento do ar no interior de um dispositivo CAO. Posteriormente, o modelo foi verificado com os resultados numéricos produzidos num estudo onde o escoamento de ar turbulento sobre o degrau descendente foi simulado e a validação destes também foi realizada com os dados experimentais utilizados na validação do presente estudo. O modelo que utiliza ? − ? padrão para turbulência, o Enhanced Wall Function como função de parede e o SIMPLE para o acoplamento pressão velocidade, obteve convergência em aproximadamente 30 min de simulação e apresentou erro de 1,25% na validação na verificação foi possível constatar a acurácia ao se calcular o MAE (Mean Absolute Error) entre o presente estudo com dados numérico e experimentais para as secções transversais x/H = 1, 4 e 16, onde x é a componente cartesiana e H o parâmetro de admencionalização do domínio.
Archaeological observations on agro-pastoralist integration in south-central Inner Mongolia during the Eastern Zhou
Authors: Cao Jian’en
Published: December 2023

This paper archaeologically investigates three representative Eastern Zhou cemeteries in south-central Inner Mongolia. Through analysis, two types of tombs can be distinguished, according to the forms of tombs and assemblages of grave goods. Type A tombs belong to Zhao state agricultural immigrants from the south; Type B, pastoralists from the north. The coexistence of two groups of people with distinct subsistence economies in one cemetery reflects the integration process of agriculturalists and pastoralists. The emergence of agro-pastoralist integration in central-southern Inner Mongolia cross-confirms historical trajectory of the southward advance of pastoralists and the strategic management of northwestern areas by the Zhao state.
Further discussion on the origins of horse stirrups
Authors: Li Yunhe
Published: December 2023

This study re-examines the origins of stirrups and related issues by reassessing two prevailing theories: the “leather toe loop theory” and the “toe stirrup theory.” Through analysis of original archaeological material from the Scythian, Indian, and the Yunnan Dian cultures, along with new insights from fieldwork and examination of a variety of horse tack, this study points out that both outdated theories misinterpret the original material and present unreliable arguments. Consequently, it is unconvincing to claim that stirrups originated from either leather toe loops or toe stirrups. The improvement of saddle structure should not be ignored in an exploration of the origin of stirrups. The solid-tread saddle, which first appeared during the Wei and Jin periods, not only stimulated the invention of the stirrup but also provided necessary structural support for its use.
Fast and facile pH tailored green synthesized ZnO photocatalyst by biogenic reduction using water extract of Averrhoa bilimbi (L) fruit
Authors: Ramanarayanan Rajita , Swaminathan Sindhu , Meethal Bhabhina Ninnora
Published: December 2023

The present study reports an economical and environmentally friendly technique for the synthesis of zinc oxide nanoparticles. The water extract of Averrhoa bilimbi (L) fruit was used in this one-pot synthesis approach for ZnO nanoparticle reduction and stabilisation. Varied size, shape and properties of the synthesized nanomaterials were obtained by tuning the pH of the synthesis medium. X-ray diffraction techniques, diffuse reflectance spectroscopy, photoluminescence and scanning electron microscopy analysis were used for characterizing phytochemical capped ZnO nanoparticles. The morphological change with varying pH was observed from scanning electron microscopy images. Short duration of synthesis with high yield product at ambient room temperature are the salient features of this procedure. The synthesised ZnO nanoparticles showed excellent photocatalytic activity and superhydrophilicity to be used in a wide range of applications.
Seriality and Individualization: Carving the Fluted Sarcophagi from Hierapolis of Phrygia
Authors: Anguissola Anna
Published: December 2023

Several marble sarcophagi, including both plain or fluted coffins and chests decorated with garlands, friezes, and elaborate compositions framed by columns and covered with roof-shaped or kline lids, are attested in the Roman burial grounds at Hierapolis in Phrygia (Turkey). Because of their repetitive, standardized pattern, fluted sarcophagi have been dismissed by scholars as the formulaic, more affordable output of local workshops. Contrary to the apparent simplicity, however, each item is highly individual with respect to the morphology of its mouldings and flutes, surface treatment, and decorative details. The majority of the pieces from the North Necropolis seem to have been carved in response to individual requirements. While rationalized modes of production likely dominated the economic landscape of the Roman sarcophagus industry, customers could exercise a significant degree of control over the pieces carved by local quarry-based workshops. Exploration of these processes, operational flows, and histories may yield new perspectives on the social and economic relationships that underpinned the production and trade of Roman sarcophagi.
Preparation of PVDF-HFP/CB/Ni nanocomposite films for piezoelectric energy harvesting
Authors: Wang Yang , Lei Dan , Wu Liangke , Hu Ning , Ning Huiming , Alamusi  , Liu Yaolu
Published: December 2023

As a representative flexible piezoelectric polymer, polyvinylidene fluoride (PVDF) and its copolymers have been widely used in energy harvesters and piezoelectric sensors. In this work, hybrid nanocomposite films were prepared by adding a small amount of carbon black (CB) and Ni nanoparticles to the poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix using the solution casting method, followed by stretching and poling to increase the electroactive β-phase content. The results show that the hybrid fillers consisting of 0.3 wt% CB and 0.1 wt% Ni nanoparticles exhibit the best piezoelectric performance. The maximum output voltage of the PVDF-HFP/CB/Ni films reaches 3.5 V under 1 mm micro-vibration, which is 75% higher than that of pure PVDF-HFP films. Characterization results by X-ray diffraction analysis, Fourier-transform infrared spectrometry, and differential scanning calorimeter analysis show that the hybrid fillers are more effective in promoting the phase transformation from the α-phase to the β-phase in the matrix due to synergistic effect.
Quantum mechanical investigation of the mechanism of Ni(0)-catalyzed cycloaddition reaction of 2-cyclobutanone with alkyne
Authors: Badawi Mohammad Abd Al-Hakim , Al-Zaben Maha I. , Sotal Ahmad , Alzahrani Abdullah Y. , khairbek Ali , Thomas Renjith
Published: December 2023

The mechanism of the Ni(0)-catalyzed cycloaddition reaction of 2-cyclobutanone with alkyne was studied using the function M06-2X with two basis sets. The computational results indicate that the reaction occurs through two independent pathways, one of which is related to the coordinating of C=O bond of oxidative addition of 2-cyclobutanone to the Ni(0) center (pathway 1), and the other involves coordination of C(sp3)–H bond (pathway 2) to form an intermediate containing either a Ni–C(O) or Ni–C (sp3) bond, then insertion an alkyne into either Ni–C(O) or Ni–C(sp3) bond. In the last step, the products are formed and the catalyst is regenerated through the reductive elimination. Our computational results are consistent with previous computational studies for cycloaddition of 3-azetidinone to alkyne except that the mechanism takes place through two independent pathways, i.e. there are no transition states or intermediates involved in the two pathways, which is contrary to what it has been indicated in previous studies. In addition, our results show that the Ni-catalyzed cycloaddition reaction of the 3-azetidinone with the alkyne is more active compared to the 2-cyclobutanone by free energy of 10.4 and 9.3 kcal/mol according to pathway 1 (7.4 and 8.1 kcal/mol according to pathway 2) calculated by the M06-2X(I) and M06-2X(II) methods, respectively. An analysis of the electrophilic and nucleophilic indices of the reactants was carried out.
Representación poética del yo en los diarios de Alejandra Pizarnik
Authors: García Gallegos Nancy
Published: December 2023

El libro es el resultado de una investigación que pretende y logra traspasar el espectro de la especulación mediática para ofrecer una perspectiva crítica sobre el proceso transformacional que los diarios de Pizarnik revelan.
Exploring Individual and Contextual Factors Associated With Sexual Risk and Substance Use Among Underserved GBQMSM and Transgender and Nonbinary Persons in South Central Appalachia
Authors: Sucaldito Ana D. , Tanner Amanda E. , Mann-Jackson Lilli , Alonzo Jorge , Garcia Manuel , Chaffin John W. , Faller Rachel , McGuire Tucker , Jibriel Mohammed , Mertus Sulianie , Kline David M. , Russell Laurie , Stafford Jeanette , Aviles Lucero Refugio , Weil Peggy H. , Wilkin Aimee M. , Rhodes Scott D.
Published: December 2023

Gay, bisexual, queer, and other men who have sex with men (GBQMSM) and transgender and nonbinary persons are at elevated risk for HIV, sexually transmitted infections (STIs), and hepatitis C (HCV); in Appalachia, these communities experience more disease burden. However, little is known about the factors influencing risk. Sixteen semistructured in-depth interviews were conducted examining factors influencing prevention and care. Data were analyzed using constant comparison methodology. Fifteen themes emerged within four domains: social environment (e.g., microaggressions across gender, sexual orientation, and racial identities), substance use (e.g., high prevalence, use as coping mechanism), sexual health (e.g., misinformation and denial of risk for HIV and STIs), and access to health care (e.g., cost and transportation barriers, lack of local respectful care). Findings highlighted salient barriers and assets influencing prevention and care and suggest that multilevel interventions are needed to improve access to and use of HIV, STI, and HCV prevention and care services.
Nanoparticle-Based Vaccines against Zoonotic Viruses: A Review
Authors: Zhang Xiaowei , Cui Zongqiang
Published: December 2023

Vaccines are the most promising tools for maintaining public health. Most emerging human infectious diseases are caused by viruses originating from an animal reservoir via zoonotic transmission. Therefore, zoonotic virus spillover and spread in humans have become global health threats. Nanoparticle-based vaccines are ideal for antigen delivery, as adjuvants, and as viral structure mimics. Nanoparticles benefit vaccine design and are utilized to protect the antigen cargo, and increase the immunogenicity and efficacy. Therefore, nanoparticle vaccines are a novel method of immunization by which optimal immune responses are elicited. Herein we review current approaches in the development of nanoparticle vaccines and highlight the role of nanoparticle vaccines against zoonotic viral diseases.
Inclusion of managers and other practitioners in scientific research (pros and cons)
Authors:   Uniwersytet Jagielloński, Poland, Lenart-Gansiniec Regina
Published: December 2023

The aim of the article is to identify positive and negative consequences of inclusion of managers and other practitioners in scientific research in management and quality science. The article presents the results of qualitative research in the form of semi-structured interviews conducted with forty scientists. The results show that positive consequences of inclusion of managers and other practitioners in scientific research include the possibility of confirming the researcher’s findings, obtaining a broader view of the research problem, being provided with ideas for conducting scientific research, formulating research questions, making scientific language more accessible for people outside academia, the utilitarian and practical application of research, better creating research tools, accessing resources, collecting research data, involvement in interpretation and, subsequently, writing research reports, and commercializing research results. On the other hand, the negative consequences are the perceived lack of benefits from including managers and other practitioners in scientific research in the research process, the lack of opportunity to involve society in all scientific problems, organizational reluctance due to lack of benefits, pressure from organizations concerning the final form of results, difficulty in understanding the specifics of research by managers and other practitioners in scientific research, cost and time consumption, researcher subjectivity, and the risk of violating methodological rigor and intellectual property rights.
Exploring polyphenols extraction from Thuja occidentalis L. bark: Optimization, phytochemical profiling, and biological evaluation
Authors: Coman Năstaca-Alina , Babotă Mihai , Nădășan Ingrid , Lucian Rideg , Ștefănescu Ruxandra , Frumuzachi Oleg , Mocan Andrei , Nicolescu Alexandru , Tanase Corneliu
Published: December 2023

Polyphenols were extracted from Thuja occidentalis L. bark and characterized in terms of phytochemical composition and biological activity. The optimization process investigated the impacts of extraction duration, ultrasound amplitude, and ethanol concentration on the total phenolic content in the extract. The antioxidant capacity was examined using DPPH and ABTS assays, and anti-enzyme activity against alpha-glucosidase, alpha-amylase, lipase, acetylcholinesterase, and tyrosinase was determined. The experimental model revealed optimal extraction parameters: a hydroethanolic solvent with 44% v:v ethanol, a 15-minute extraction time, and a 40% ultrasound amplitude. These parameters were validated and confirmed by reaching the target Total Phenolic Content (TPC) predicted by MODDE software. The resulting lyophilized extract exhibited a high polyphenolic content (161.84 ± 23.48 mg GAE/g dry extract) and demonstrated strong antioxidant properties. Notably, it showed significant inhibition of alpha-glucosidase and alpha-amylase, suggesting potential antidiabetic effects, though its inhibition of tyrosinase activity was relatively weak. These findings provide a foundation for further investigations to confirm the qualitative and quantitative presence of specific polyphenolic metabolites in the extract and elucidate the mechanisms underlying its bioactive properties.
The influence of marine and continental waters on the clay minerals transformation processes of evaporite deposits (on the example of the Kalush-Holin’ deposit, Carpathian Foredeep)
Authors: Hryniv Sofiya , Yaremchuk Yaroslava , Radkovets Natalia
Published: December 2023

The influence of the chemical composition of marine and continental waters on the formation and transformation of clay minerals is considered on the example of evaporites of the Kalush-Holin’ potash deposit of the Carpathian Foredeep. Clay minerals under variable physical and chemical conditions become unstable and transformed, adapting to new conditions. The main factor that causes changes in their composition and structure is the concentration of brines. The increased concentration of brines at the stage of deposition of potassium salts contributed to the aggradational transformation of clay minerals, the transformation of labile minerals into illite and chlorite that are stable in the hipersaline environment. These two minerals – illite and chlorite are characteristic of the Kalush-Holin’ potash deposit. Further arrangement of the structure leads to the transformation of part of the illite into mica. On the clay fraction diffractograms of some potash rocks, the basal reflex 001 is wide and bifurcated at the top on a line with interplanar distances of 0.99 and 1.0 nm, this indicates the presence of structurally similar minerals – mica and illite. Under conditions of hypergenesis, when evaporite deposits are washed away by fresh surface waters, a reverse process (degradational transformation) takes place, which occurs in the leaching of potassium from the interlayer space of a part of illite and the formation of labile clay structures. The clay mineral association of the gypsum-clay caprock of evaporite deposits, in addition to illite and chlorite, also contains mixed-layer illite-smectite and kaolinite – the appearance of these clay minerals in hypergenic deposits is the result of degradational transformation (illite-smectite) and formation de novo (kaolinite) under conditions of decreased saline brine concentration. Capture of potassium by the structure of the mixed-layer illite-smectite and its transition into illite (aggradational transformation) occurs more easily than the reverse process – potassium leaching and transformation of illite into a mixed-layer illite-smectite (degradational transformation).
Thirty years of research in tropical medicine: historical trends for the world and for the Revista de Biología Tropical (1990-2020)
Authors: Monge-Nájera Julián , Ho Yuh-Shan
Published: December 2023

Introduction: The importance of tropical medicine cannot be overstated, since by the end of the 2030s, most humans will live in the tropics and will need protection from tropical diseases. Nevertheless, until now, there are no bibliometric studies about tropical medicine as a whole; all previous studies are limited to diseases, countries or particular journals, and are often limited to brief periods of time. Here we present an analysis of historical trends for the world and for the Revista de Biología Tropical in celebration of the journal’s 70th anniversary. 

Objective: To assess geographic and historical trends in the study of tropical medicine included in a general database, the Web of Science and from a detailed analysis of one journal of particular importance for the field in the neotropical region. 

Methods: We limited our data to journals covered by the Web of Science category “tropical medicine” in the Science Citation Index Expanded (data updated 19 January 2022) and the Journal Citation Report on 30 June 2021. 

Results: We retrieved 69 480 articles, of which 44 % resulted from international collaboration with 194 participating countries; articles may reach 17–21 citations each, and the countries with outstanding results in the database include USA, Brazil, UK, Kenya and Switzerland. Research focus changes as diseases such as HIV, Dengue and tuberculosis become more or less important over time, but overall there was much research on Plasmodium, leishmaniasis and schistosomiasis. The journal Revista de Biología Tropical has significantly increased the number of topics covered, but still publishes studies about tropical biomedical subjects.

Conclusions: While countries with large research budgets have a large presence in this database, lower income tropical countries like Brazil and Kenya have done a remarkable contribution in the field of tropical medicine. The Revista de Biología Tropical has been publishing quality research about tropical medicine for the last seven decades.
Microbiologia Integrada
Authors: Wille Caroline Neugebauer , Escott Clarice Monteiro , Pizzato Michelle Camara
Published: December 2023

Para o desenvolvimento de um produto educacional (PE) adequado ao ensino de Microbiologia no contexto do Ensino Médio Integrado (EMI), foi avaliada a percepção de professores e estudantes sobre materiais disponíveis para o ensino de Microbiologia no EMI. Com base nos resultados obtidos, foi proposta a elaboração de um PE tendo a Pedagogia Histórico-crítica como possibilidade de desenvolver os conteúdos de Microbiologia em uma perspectiva integrada. O PE foi aplicado em turmas de EMI e avaliado por estudantes e uma equipe multidisciplinar de professores e pedagogos. A avaliação sugere que o PE “Microbiologia Integrada” cumpre seu propósito, oferecendo um material adequado ao EMI, que se destaca pela linguagem acessível e visual atrativo.
UTILIZATION OF MACKAREL TUNA IN LIQUID ORGANIC FERTILIZER AGAINST PHOSPHORUS AND CALCIUM CONTENT
Authors: Adharani Nadya , Agustin Cici , Sulthoniyah Siti Tsaniyatul Miratis
Published: December 2023

Mackarel tuna is one of the fish that is quite abundant in Banyuwangi, its existence in the Java and Bali seas is found throughout the month, therefore the use of mackerel tuna fish into processed food products is often made by the community. In addition to being a valuable product, mackerel tuna fish bones can be processed into other products that are useful in agriculture, namely organic liquid fertilizer. This study was conducted on a laboratory scale with four different treatments (length of fermentation time) including 5, 10, 15, and 20 days, where each treatment was repeated 4 times. The purpose of the study was to find out the best phosphorus and calcium content from four different treatments. The results of the study found that the best fermentation period of liquid organic fertilizer was on the 20th day of fermentation with a value of phosphorus (P) content of 0.091%, calcium (Ca) of 0.377%.