bluuebunny/crossref_metadata_2025_split huggingface dataset:
Prediction of formation fracture pressure based on reinforcement learning and XGBoost
Authors: Wan Bingqian , Xu Shengchi , Luo Shuai , Wei Leipeng , Zhang Ci , Zhou Diao , Zhang Hao , Zhang Yan 
Published: October 2024

Abstract
Clearly determining the magnitude of fracture pressure is a crucial indicator for fracturing design. Traditional methods for predicting fracture pressure suffer from challenges such as difficulties in obtaining required data, low prediction accuracy, and local limitations in application. In light of these issues, the article proposes a fracture pressure prediction model based on reinforcement learning and XGBoost utilizing geophysical well logging data. Based on the relevance analysis, optimal input parameters, including DEPTH, DEN, AC, GR, CRL, and RT, are selected from geophysical well logging data. We have developed a framework for a fracture pressure prediction model based on XGBoost, wherein hyperparameters are fine-tuned using an improved Q-learning algorithm. The optimized XGBoost model for fracture pressure prediction attains outstanding performance metrics, including an R
2 value of 0.992, a root mean square error of 0.006%, and a mean absolute error of 0.539%. In direct comparison with grid search, Bayesian optimization, and ant colony optimization, the improved Q-learning algorithm emerges as the most effective optimization approach. The predictions generated by the proposed method exhibit remarkable consistency with fracture pressure data measured on-site. This approach successfully addresses the shortcomings encountered with traditional fracture pressure prediction methods, such as inadequate accuracy, demanding data prerequisites, and constrained applicability.
Statistical modelling of a tractor tractive performance during ploughing operation on a tropical Alfisol
Authors: Alhassan Elijah Aina , Olaoye Joshua Olanrewaju , Lukman Adewale Folaranmi , Adekanye Timothy Adesoye , Abioye Oluwaseyi Matthew 
Published: October 2024

Abstract
Tractor is the most prominent off-road agricultural machinery that is significant to the global food security. The tractive modelling of tyre–soil interaction and agricultural implement dynamics is a complex phenomenon that require holistic approach. Terramechanics techniques such as empirical, semi-empirical, analytical, and numerical methods such as finite element models and discrete element models have gained traction in tractive performance studies. Some of these approaches are premised on large arrays of variables for modelling tractive performance based on the soil–tyre and tools interactions. In this study, soft computing in R software domain was used to model the tractor tractive performance during ploughing operations on a tropical Alfisol. The research farm at the National Centre for Agricultural Mechanization was used for the field experiment. The experimental design was a nested-factorial under a Randomized Complete Block Design having three replications. The input factors were tractor power size, T, (60, 65, and 70 hp); tyre inflation pressure, P, (83, 124, and 165 kPa); implement configuration, I, (2 and 3 bottoms disc plough); and operational speed, S, (6.31, 7.90, 9.47, 11.05, and 12.63 km/h). Standard procedures were followed to obtain the measured parameters in the field, which were statistically analysed. Correlation analysis and analysis of variance of the measured parameters at 5% significance level were established. Multiple linear regression was used to develop the model, validated using the 10-fold cross-validation method. The results revealed that the evaluated variables have a range of 1.56–7.79 kN, 5.15–27.20%, 9.10–32.00 cm, 4.50–13.94%, 1.31–1.67 g/cm3, 95.89–207.78 kPa, and 98.67–295.56 for draught, wheel slip, depth of cut, moisture content, bulk density, cone index (CI), and shear stress, respectively. A positive correlation exists between the towing force (TF) and the measured variables except for the shear stress and CI. The final developed model has seven variables for predicting TF with a 6.5% error and an average of 0.4735 cross validation root mean square error. The model quality of fit achieved an

R

Adj

2

=
0.8754

{R}_{\text{Adj}}^{2}=0.8754

which satisfactorily described the response variable. The study provides insights into tractive dynamic systems modelling of machine, tractive medium (soil), and agricultural tools anchored on soft computing approach. Its adoption will assist in quality ploughing operation integrating the variables established in the model.
Inspiring Contributions: Fan Leaders’ Directives and Encouragement in the Chinese Online Celebrity Fan Community
Authors: Xiao Yiqing , Ahadzadeh Ashrafsadat 
Published: October 2024

Abstract
In the neoliberal era, there is a new phenomenon where numerous fans follow fan leaders’ instructions to make tangible or intangible contributions to support celebrities, which has exacerbated economic polarization. Although past studies have explored fan empowerment in the Internet era, fan leaders’ promotion effect has remained unstudied. This study aimed to discover fan leaders’ role in guiding fans’ contributions in the Chinese fan community. By integrating a two-step flow model and participatory culture theory, it used qualitative content analysis to analyze 410 posts and 972 comments in the Chinese singer Song Yaxuan’s fan community from February 3 to 10, 2023. Through an inductive approach, four main themes were derived from results: (1) task delegation and empowerment; (2) user-friendly instructions and seamless communication; (3) highlighting a sense of crisis and putting pressure on fans; and (4) fostering a collective mindset. The findings revealed fan leaders use different techniques and the top-down structure in the community to encourage fans to give voluntary contributions of money or time to the celebrity’s development. Theoretically, this study showed internal operation logic in Chinese fan community. Practically, the study shed light on how to lessen the harmful consequences of neoliberalism’s features within the Chinese entertainment industry and realize healthy development.
Impact of Disaggregated External Debt on Economic Growth: Evidence from Asian Developing Economies
Authors: Dawood Muhammad , Feng Zhao Rui , Ilyas Muhammad 
Published: October 2024

Abstract
This study investigate the impact of total and disaggregated external debt on economic growth, across 32 Asian developing economies (ADE) from 1995 to 2020. The study applied the generalized method of moments (GMM) and dynamic common correlated estimator (DCCE) with interaction terms of institutional quality and macroeconomic policy to address the non-linearity, across-country heterogeneity, cross-sectional dependence and endogneity. The empirical results indicate that total external debt and its types initially harm economic growth, except for commercial creditors’ debt, which has positive effects. Short-term, private, and multilateral debt show weaker negative associations compared to long-term, public, and bilateral debt. Incorporating interaction terms in non-linear models reveal a shift from negative to positive impacts, highlighting the importance of robust institutional quality and stable macroeconomic policy in mitigating adverse debt effects. Our findings underline the necessity of tailored policies accounting for specific impacts of different debt types on economic growth. Moreover, highlight the significance of institutional quality and macroeconomic policy standards to manage risks, optimize debt management practices, adjust fiscal policies, and foster sustainable economic growth. Future research should further investigate the broad impact of domestic debt in conjunction with external debt across different countries, time periods, and methodological approaches.
КАМЕННЫЕ УГЛИ КУЗБАССА - ОСНОВНОЕ СЫРЬЕ ДЛЯ ВОССТАНОВЛЕНИЯ ПРОИЗВОДСТВА АКТИВНЫХ УГЛЕЙ
Authors: МУХИН В.М. 
Published: October 2024

Показана широта применения активных углей (АУ) во многих сферах экономики, экологии и обороны страны. Отмечены уникальные физико-химические характеристики АУ и представлено современное их определение. Установлено, что в настоящее время Российская Федерация существенно отстает по объему производства АУ от промышленно развитых стран. Обращено внимание к каменным углям Кузбасса как сырью для многотоннажного производства АУ, рассмотрены различные технологии получения на их основе АУ.
The breadth of the use of activated carbons (AC) in many areas of economy, ecology and defense of the country is shown. The unique physicochemical characteristics of AC are denoted, and their modern determination is presented. It is established that the Russian Federation is currently lagging far behind industrialised countries in the output of AC production. Attention is paid to the coals of Kuzbass as a raw material for the large-tonnage production of AC. Various technologies for manufacturing active coals on this basis are considered.
A leitura compartilhada como instrumento de desenvolvimento da compreensão textual de alunos do 3º ano do Ensino Fundamental
Authors: Leite Jan Edson Rodrigues , Luna Morgana Farias de 
Published: October 2024

O presente artigo é resultado de uma pesquisa realizada com alunos do 3º ano do ensino fundamental dos anos iniciais de uma escola pública em João Pessoa (PB). Tendo como propósito investigar os efeitos da leitura compartilhada na compreensão leitora dos alunos, partimos da hipótese de que quando a criança é envolvida na prática de leitura compartilhada, suas habilidades linguístico-cognitivas para as tarefas de compreensão de textos se expandem consideravelmente. A problemática do presente trabalho baseia-se na seguinte indagação: de que forma a leitura compartilhada, como prática pedagógica, pode afetar o desenvolvimento das habilidades cognitivas necessárias à compreensão de leitura em crianças do terceiro ano do ensino fundamental? Para responder à essa questão realizamos uma pesquisa quali-quantitativa com dois grupos de alunos, na qual aplicamos atividades de leitura compartilhada e de interpretação de quatro textos, analisando algumas habilidades da BNCC referentes à interpretação do texto: i) localizar informações explícitas em textos – EF15LP03; ii) inferir informações implícitas nos textos lidos – EF35LP04; iii) inferir o sentido de palavras ou expressões desconhecidas em textos, com base no contexto da frase ou do texto – EF35LPO5; e iv) opinar e defender ponto de vista sobre tema polêmico relacionado a situações vivenciadas na escola e/ou na comunidade, utilizando registro formal e estrutura adequada à argumentação, considerando a situação comunicativa e o tema/assunto do texto – EF35LP15. As duas turmas foram submetidas a diferentes práticas de leitura, sendo que a turma A (controle) realizou a leitura da maneira convencional e a turma B (experimental) foi submetida à prática da leitura compartilhada. Ambas as turmas responderam aos mesmos testes de compreensão textual após as atividades de leitura. Os dados gerados após as análises dos resultados das atividades de interpretação de texto, indicaram que a turma (B) experimental apresentou melhor desempenho geral em relação à turma (A) controle, no desenvolvimento das quatro habilidades testadas (EF15LP03; EF35LP04; EF35LPO5 e EF35LP15).
Contação de histórias: contribuições da leitura de textos literários para o letramento
Authors: Zappone Mirian Hisae Yaegashi , De Sousa Thais Fernanda , De Sousa Isabelly Oliveria Fernandes 
Published: October 2024

A realização de práticas de letramento, ou seja, de práticas sociais que envolvam a leitura e a escrita, é fundamental para o desenvolvimento dos processos de aprendizagem escolar nos anos iniciais e seguintes. Para que o ensino nas séries iniciais seja efetivo, para tanto, há necessidade de que família e escola favoreçam diferentes práticas de letramento oportunos à formação acadêmica e social do indivíduo. Os estudos de Shirley Heath (1982), por exemplo, defendem que a contação de histórias constitui evento de letramento fundamental para o desenvolvimento de habilidades cognitivas relevantes nas primeiras séries escolares. Tendo como base este estudo, este artigo objetiva demonstrar, por meio de levantamento de dados feito com contadores de história associado a dados de pesquisa realizada por Heath (1982), o quanto essa prática de leitura pode favorecer o desenvolvimento escolar. Nesse sentido, o ambiente escolar pode ser um espaço importante para suprir práticas de letramento de grupos minoritários que não têm a oportunidade de ofertar um ambiente letrado aos filhos. Por isso, a análise do letramento escolar permite compreender seu papel na inclusão social para mitigar desvantagens escolares advindas da pertença social de muitos estudantes – com o intuito de que crianças não favorecidas com ambientes onde as práticas de letramento são desenvolvidas tenham a possibilidade de participar ativamente na escola e na sociedade.
Dziennik z getta łódzkiego / Das Tagebuch aus dem Lodzer Getto
Authors: Hauser Irene , Sitarek Adam 
Published: October 2024

Od godziny siódmej do dziesiątej ciągle nie ma chleba. Straszny głód. Jest mi niedobrze od żołądka i jestem całkowicie osłabiona. Nie jestem już w stanie pościelić dwóch prycz, nogi już mnie nie niosą. Cud, że ręka jeszcze pisze. Biorę walerianę bez cukru, kładę się. Bubi z głodu liże kwasek cytrynowy. Jest godzina jedenasta i jego ciągle jeszcze nie ma z chlebem. Wszystko w nas się trzęsie. On ma kartkę na chleb, a nikt nic nam nie pożyczy. Dwa takie dni i nie będzie nas wśród żywych.
Irene Hauser, Dziennik
Antenna Tracker System for Unmanned Aerial Vehicles: A Short Review
Authors: Yusuf Hayyan , Rahutomo Faisal , Sutrisno Sutrisno 
Published: October 2024

<p class="Abstract">Unmanned Aerial Vehicle (UAV) is a modern technology used to perform difficult and dangerous aerial missions that cannot be carried out by manned aerial vehicles. Ground Control Station (GCS) is a system that manages all the parameters of the UAV. GCS and UAV communicate using radio waves through telemetry, which functions to transmit and receive flight data. Antenna tracker is a device used to connect the GCS (Ground Control Station) and the UAV (Unmanned Aerial Vehicle). The antenna tracker works by performing tracking to direct the antenna towards the UAV. Nowadays, there are various forms of antennas used in telecommunication technology. Each type of antenna has its own radiation characteristics, some are directional, while others are more omnidirectional. Directional antennas are the right choice to be used with an antenna tracker. Generally, directional antennas have a narrow radiation range but a relatively long transmission distance. This paper provides a review of the state-of-the-art in antenna tracker technology for unmanned aerial vehicles (UAVs), with a focus on design, performance, and type of antenna. The study involved a literature search of various databases. The design approaches for antenna tracker systems range from simple single-axis trackers to sophisticated dual-axis trackers with pan-tilt mechanisms, and type of antenna such as helical were explored. The study concludes that antenna trackers have numerous applications in various industries, including military, agriculture, and surveying, and the demand for reliable and accurate antenna trackers is expected to continue to grow with the increasing popularity of UAVs. </p><p class="Abstract"> </p><p class="Abstract"> </p><p class="Keywords"> </p>
The Benkar Fault Zone: An Orogen-Scale Cross Fault in the Eastern Nepal Himalaya
Authors: Giri Bibek , Hubbard Mary , McDonald Christopher S. , Seifert Neil , KC Bishal 
Published: October 2024

AbstractThe Benkar Fault Zone (BFZ) is a recently recognized, NNE-striking, brittle to ductile, cross fault that cuts across the dominant metamorphic fabric of the Greater Himalayan Sequence (GHS) and the Lesser Himalayan Sequence (LHS) in eastern Nepal. 40Ar/39Ar-muscovite cooling ages along a transect across the BFZ in the GHS indicate movement younger than 12 Ma. To understand the mode of genesis, and seismo-tectonic implications of the BFZ, we mapped this fault from the Everest region in the upper Khumbu valley toward the south, across the Main Central Thrust, into the LHS and the Greater Himalayan Nappe. We recognize a series of cross faults segments, which we interpret the BFZ system. The currently mapped section of the BFZ is &gt;100 km long, and its width is up to 4 km in the LHS. The BFZ is semi-ductile in the GHS region but is brittle in the south, where it is expressed as gouge zones, tectonically brecciated zones, sharp fault planes, and segments of nonpenetrative brittle deformation zones. From petrographic and kinematic analysis, we interpret largely a right-lateral, extensional sense of shear. Our work did not continue into the Sub-Himalaya, but the BFZ may continue through this zone into the foreland as documented in other Himalayan cross faults. While several genetic models have been proposed for cross faults in the Himalaya and other convergent orogens, we suggest that the BFZ may be related to extensional structures in Tibet. Understanding cross faults is not only important for the tectonic history of the Himalaya but due to the co-location of cross faults and seismogenic boundaries, there may be a causal relationship. Cross faults also follow many of the north-south river segments of the Himalaya and weakened fault rocks on the valley walls may enhance the landslide hazard in these areas.
A Study of Dimethyl Ether-Steam Coinjection Using a Large-Scale Physical Model
Authors: Amer Hassan , Sheng Kai , Okuno Ryosuke , Filstein Alex , French Matthew , Sanchez Javier O. , Al-Gawfi Abdullah , Nakutnyy Petro 
Published: October 2024

Summary
Dimethyl ether (DME) as a water-soluble solvent has been studied as a potential additive to steam for improving the energy efficiency of steam-assisted gravity drainage (SAGD). The main objective of this research was to study in-situ flow characteristics and energy efficiency of DME-SAGD using a large-scale physical model. Results from DME-SAGD were compared with the control experiment of SAGD with no solvent injection using the same experimental setup. The main novelty of this research lies in the experimental data that demonstrated enhanced bitumen drainage by DME-SAGD in comparison with SAGD.
The experiment was conducted in a cylindrical pressure vessel with a diameter of 0.425 m and a length of 1.22 m, which contained a sandpack with a porosity of 0.34 and a permeability of 5.0 darcies. The DME-SAGD experiment used a DME concentration of 10 mol% and a steam coinjection rate of 27.6 cm3/min [cold-water equivalent (CWE)] at 3000 kPa. Temperature distributions within the sandpack, along with injection and production histories, were recorded during the experiment. Subsequently, numerical simulations were performed to history match the experimental data, and the calibrated simulation model was used to analyze the details of compositional flow characteristics.
Results showed that the 10 mol% DME-SAGD experiment yielded a recovery factor (RF) of 92.7% in 4.2 days, and the SAGD experiment yielded an RF of 68.6% in 6.0 days; for both experiments, the first 2 days were the preheating and the steam-only injection (SAGD) stages. The peak rate of bitumen production was 43.8 mL/min in the DME-SAGD experiment, which was more than twice greater than the peak rates observed in the SAGD experiment. The substantially increased rate of bitumen production resulted in a cumulative steam/oil ratio in DME-SAGD that was less than half of that in SAGD.
Analysis of experimental results indicated that the solubility of DME in the aqueous and oleic phases caused different flow characteristics between DME-SAGD and SAGD. For example, the oleic and aqueous phases were more uniformly distributed in the sandpack in the former. Simulations indicated that DME-SAGD had a greater distribution of grid-scale inverse mobility ratio and increased oleic-phase mobilities in comparison with SAGD.
Acquisition Study of Downhole Explosion Limit in Air Drilling
Authors: Li Hongtao , Li Yibo , Li Gao , Meng Yingfeng , Huang Wanni , Li Yongjie 
Published: October 2024

Summary
Downhole explosions adversely affect air drilling; however, the explosion limit can facilitate the adjustment of the flow rate to prevent downhole explosions. The downhole explosion limit, comprising lower and upper limits, can be determined through diverse methodologies. In this study, the interrelation between absolute enthalpy and adiabatic flame temperature (AFT) enabled the deduction of the lower explosion limit (LEL) prediction method, and an equilibrium between heat generation and heat transfer formed the basis for the upper explosion limit (UEL) prediction method. Additionally, a variable-volume apparatus was established to measure the explosion limit and adjust the pressure precisely without changing the amount of gas. The explosion limit of methane in the air was determined using both predicted and experimental methods, mirroring the scenarios of natural gas entering the wellbore during air drilling. The theoretical model exhibited the same reliability as the experimental results, and the prediction method for the explosion limit proved more efficient. Moreover, the effects of initial temperature and pressure on the explosion limit are discussed. The LEL decreased by an average of 15.5% when the initial pressure increased from 0.1 MPa to 2 MPa, while the UEL experienced a significant increase by an average of 152%. The UEL exhibited a logarithmic dependence on the initial pressure. The effect of the initial temperature on the explosion limit was noticeably less pronounced than that of the initial pressure. This study provides the essential theoretical basis and experimental results for avoiding downhole explosions during air drilling.
Polyphenol Retention, Antioxidant Capacity, and Economic Importance of Spent Gin Botanicals
Authors: Umego Ekene Christopher , Barry-Ryan Catherine 
Published: October 2024

Abstract

Purpose
Gin ranks among the most widely consumed alcoholic beverages globally. It is produced by the flavouring of neutral alcohol with botanicals. Volatile organic compounds in botanicals give gin its flavours. The solid residue left at the end of gin distillation is the spent gin botanicals (SGB). SGB can be valorised as a bioresource for polyphenols. As a result, the study examined gin botanicals mix (GBM) and SGB to assess the impact of gin distillation on polyphenol retention and antioxidant capacity of SGB as well as its economic significance.
Methods
Samples of GBM and SGB were obtained from three gin distilleries in Ireland. The samples were prepared for extracting polyphenols and evaluating them using parameters optimised from a prior study, along with standard assay methods. The economic importance of SGB was assessed using data and information gathered from various industry reports and market research tools.
Results
The assays for polyphenol content and antioxidant capacity showed that the SGB samples retained up to 50% of their polyphenol content and antioxidant capacity post distillation through the various in-vitro assays used. The economic importance of SGB highlighted its market potential and this included utilisation in health and beauty products, functional foods and beverages, and food process technologies. Trends in polyphenols market together with the market outlook were identified.
Conclusion
There is a growing demand for natural and potent sources of polyphenols, and based on the findings of this study, SGB has demonstrated potential to be utilised as a valuable bioresource for polyphenols.