bluuebunny/crossref_metadata_2025_split huggingface dataset:
Curing Soft Clay to Improve Its Strength with Composite Microbially Induced Carbonate Precipitation (MICP) and Coal Fly Ash
Authors: Wang B. , Wei R. , Xiao J. Z. , Cai H. , Feng Y. , Wu S. F. , Wang Z. W. 
Published: March 2022

Abstract
Owing to soft clay’s high water content and low strength, the large volumes of it that are excavated during coastal and waterway construction must be disposed of by being dumped on vacant land or used as fill, and results in increasingly serious environmental problems. Another important regional environmental problem is the large volumes of coal fly ash (CFA) produced by coal-fired power plants. Soft clay disposal methods that can also use CFA can have important practical significance for infrastructure construction projects and can also help the regional economies in areas with limited land resources. At present, microbially induced calcium carbonate precipitation (MICP) is used to strengthen sandy material with high porosity and permeability. Because of the special chemical compositions and complex mechanical properties of both soft clay and CFA, studies on the solidification of soft clay-CFA mixtures by microbial methods are rare. This paper describes the results of systematic MICP curing tests on composite soft clay samples with different amounts of added CFA. Changes in the strength of MICP/CFA-cured soft clay samples and X-ray diffraction analyses are used to study the MICP strengthening mechanisms. The results show the following conclusions. (1) Using composite MICP/CFA solidification can effectively improve the strength of soft clay. The clay unconfined compressive strength can be increased by a factor of 5.96. (2) MICP/CFA-aided solidification cements soft clay particles together and reduces water content by consuming the free water of soft clay during their respective reactions. (3) MICP and CFA synergistically enhance the strength of soft clay, and the solidification effect is more obvious for low water content soft clay. (4) There is an optimal composite ratio under the experimental conditions with a 0.75 mol/L bacterial nutrient concentration; the optimal composite ratio for curing is 30% water content of soft clay with 30% CFA.
Modelado de negocios para empresas cooperativas del municipio de Pasto
Authors: Díaz Dávila Juan Carlos , Delgado-Unigarro Silvio , Martínez-Delgado Diego 
Published: March 2022

Frente a las dificultades que atraviesa el país y sobre todo el municipio de Pasto a raíz de la pandemia y de la difícil situación de orden público, además de las dificultades de acceso a recursos financieros y a los mercados, se requiere con urgencia alternativas de solución que reactiven el desarrollo y las capacidades para generar fuentes de ingresos y empleo estables.
El fomento a las nuevas empresas y especialmente a las de tipo cooperativo cobran especial relevancia por su capacidad para generar autoempleo, lo cual depende en gran medida de procesos adecuados de modelado y estructuración de negocios que conduzcan a la formación de organizaciones empresariales sólidas y perdurables.
En el presente artículo se presentan los resultados preliminares de la investigación: Modelado de negocios para empresas cooperativas del municipio de pasto, cuyo objetivo principal es identificar la manera adecuada en la que un emprendimiento de tipo cooperativo, dada su especificidad y particularidades de carácter solidario, debe adelantar el proceso de diseño de su modelo de negocios y su correcta implementación, para mejorar sus posibilidades de convertirse en una empresa sólida y con posibilidades reales de permanencia y crecimiento en sus mercados.
Conceptualización del diagnóstico del Dengue desde una perspectiva de la ingeniería y las nuevas tecnologías
Authors: Arrubla Hoyos Wilson De Jesus 
Published: March 2022

Introducción: El dengue es una enfermedad tropical transmitida por mosquito que según reportes de la Organización Mundial de la Salud (OMS) deja unos 390 millones de personas infectadas cada año, es una de las enfermedades que más afecta la salud de la población y la economía a nivel mundial. En consecuencia, Se ha realizado muchos esfuerzos desde diferentes áreas del saber por hacer frente a esta enfermedad.
Objetivo: El objetivo de este artículo es presentar una conceptualización de la enfermedad del dengue desde una perspectiva de la ingeniería, caracterizando su comportamiento en las personas y como las principales tecnologías están realizando investigaciones para la predicción temprana.
Método: Para su desarrollo se consultaron bases de datos especializadas como SCOPUS, WOS, IEEE, PUBMED. De igual forma, se hizo una revisión de como las tecnologías de la información y comunicación TIC y de las ciencias computacionales están adelantando investigaciones para la predicción temprana del dengue.
Resultado: Como resultado se obtuvo que las principales tecnologías son el Machine Learning, el Big Data y la Inteligencia artificial con el desarrollo de modelos capaces de predecir la enfermedad de manera temprana. Existen muchas técnicas específicas que se utilizan, sin embargo, no se abordan en este artículo, solo se presenta la conceptualización de las tecnologías principales.
Conclusiones: Se logra concluir que existen esfuerzos desde el área de la ingeniería en realizar investigaciones asociadas a la predicción del dengue para hacer frente al impacto que está generando la enfermedad.
Modelo de Máxima Verosimilitud
Authors: Gómez-Mejía Alberto 
Published: March 2022

El objetivo de este artículo es hacer una introducción al modelo de Máxima Verosimiltiud (MV), ampliamente usado desde hace décadas en estadística, biometría, ingeniería y en econometría. A pesar de su utilidad, los cursos básicos de econometría siguen haciendo énfasis en los Mínimos Cuadrados Ordinarios (MCO) por lo fácil de su matemática y comprensión conceptual, y dejan el MV para los ejercicios con el software comercial que lo incluye por configuración , por la superioridad de los resultados frente a los del MCO. El MV es bastante utilizado para las regresiones no lineales y muestras grandes, por ejemplo, modelos de variables dependientes dicotómicas como Logit y Probit; heterocedasticidad condicional como GARCH y EGARCH, modelos censurados y truncados, etc. Es de prever que con el desarrollo de la inteligencia artificial en el data science y el machine learning, el MCO será descartado.
Antioxidant Activity Evaluation from Tomatoes’ N-Hexane, Ethyl Asetate, and Water Fraction with DPPH
Authors: Dewi Ratna Sari , Permatasari Desy Ayu Irma , Wardani Tatiana Siska , Mahardika Muladi Putra 
Published: March 2022

Antioxidants are compounds that can stabilize free radicals in the body. Free radicals are highly reactive molecules as they have unpaired electrons to interact with body cell molecules. Tomatoes contain flavonoids, saponins, solanine tannins, folic acid, malic acid, citric acid, protein, fat, vitamins, minerals, and histamine, which can be used as antioxidants. This study aims to evaluate the antioxidant activity of n-hexane, ethyl acetate, water fraction, and ethanol extracts of Tomatoes and to determine the greatest antioxidant activity between n-hexane, ethyl acetate, water and vitamin C. Tomatoes (Lycopersicum esculentum Mill.) was extracted using the maceration method with ethanol followed by fractionation using n-hexane and ethyl acetate solvents. The test of antioxidant activity to DPPH radical was conducted on n-hexane, ethyl acetate, water, and vitamin C. The antioxidant activity results, expressed by IC50 value to the n-hexane, ethyl acetate, water fraction of Tomatoes fruit, were 4.4603 ppm; 4.0868 ppm; and 4.0527 ppm, respectively. Thus, the greatest antioxidant activity was the water fraction.
Rehabilitation of post Covid mucormycosis maxillectomy defect with hollow obturator: A case series
Authors: Chincholikar Swapnil , Lalwani Gaurav 
Published: March 2022

India saw a devastating second wave of Coronavirus and along with the fatal nature of the disease the healthcare professionals saw a huge number of post Covid problems. One of these, is a fungal disease called mucormycosis which although an uncommon fungal infection can cause blackening of skin, redness, inflammation, sores and can encroach the eyes, lungs and even the brain. This warrants for extensive surgical resection and debridement of the necrosed areas resulting in maxillary and orbital defects. Intraoral defects in the maxilla cause communication with the nasopharyngeal complex. The surgically removed palate has a devastating effect on the appearance and speech of the patient. Obturator allows patients to eat and drink without letting the food to enter the oroantral cavities/ pharynx during mastication. This case series focusses on prosthetic rehabilitation of two patients with Hollow obturator post hemimaxillectomy in order to restore form and function.
Cuidado del medio ambiente desde el hogar
Authors: Castillo Sánchez Laura Viviana 
Published: March 2022

Propósito. Este ensayo describe el propósito del proyecto Cuidado del medio ambiente desde el hogar, que busca desarrollar, a través de visitas familiares, una serie de temáticas ambientales, con base en la metodología de la enseñanza universal. Con ello se pretende motivar el aprendizaje de cada uno de los miembros de la familia para promover estilos de vida más saludables enfocados en el cuidado ambiental.
Contenidos. El proyecto se fundamenta en las posturas de Edgar Morin y Jorge Riechmann, desde su perspectiva medioambiental, tanto para abordar la crisis que se está viviendo como sus posibles soluciones. Como el proyecto también va dirigido al proceso de educación, se retoma el enfoque de Jacques Rancière de una formación emancipadora.
Conclusiones. Como conclusión de esta iniciativa, se pretende que las personas se aparten de la normalidad, y se formen líderes y personas comprometidas con el cambio. También, a largo plazo, se sugiere la conformación de comités ambientales de bioética que reconozcan el diálogo y la deliberación como verdaderas herramientas transformadoras y emancipadoras de las comunidades, para propiciar cambios desde lo local, lo nacional y lo planetario.
Researchers’ Perceptions and Experiences with an Open Access Subvention Fund
Authors: Doney Jylisa , Kenyon Jeremy 
Published: March 2022

Objective – This study investigated researchers’ perceptions of open access publishing and the ways in which the university’s open access subvention fund could evolve to meet the campus community’s needs.
Methods – In spring 2021, two librarians conducted an anonymous survey using a convenience sample to recruit participants. The survey was directly distributed to 113 University of Idaho (U of I) affiliates who had received funding from, or expressed interest in, the open access subvention fund during the previous three years (FY 2019 to FY 2021). Other U of I affiliates were also offered the opportunity to participate in the survey via a link shared in the U of I’s daily email newsletter as well across the U of I’s graduate student email list. The researchers received 42 usable survey responses. The survey included 26 closed and open-ended questions and analysis included cross-tabulations based on fund applicant status as well as respondent role. Of the 26 questions, 4 were modified from a colleague’s previous study with U of I faculty members (Gaines, 2015).
Results – Survey responses showed that interest in and support for open access were common among respondents. Although a majority of respondents had published an open access journal article and would like to continue to publish open access in the future, only 17% agreed that they had departmental support to do so. Results also demonstrated that researchers were less willing to pay article processing charges (APCs) out-of-pocket and preferred for funding to come from grant budgets first, followed by Office of Research Budgets, department or college budgets, and library budgets. Respondents expressed support for many of the open access subvention fund’s current criteria and processes, but they also indicated an interest in establishing a more equitable fund distribution cycle and allowing researchers to seek pre-approval once their article was accepted for peer-review. Findings related to open access publishing perspectives built upon previous research conducted at the U of I (Gaines, 2015) and across other institutions.
Conclusion – This study confirmed the importance of evaluating and assessing library programs and services to ensure that they continue to meet the needs of campus communities. Through the study results, the researchers demonstrated that respondents were interested in open access publishing and the continuation of the open access subvention fund, as well as offering the U of I an opportunity to adjust the open access subvention fund’s processes to better serve researchers. These results also highlighted the need for those involved in open access publishing support to investigate new open access advocacy and education efforts to ensure that researchers receive the philosophical and financial support they need to pursue different models of scholarly publishing.
Crecimiento poblacional y cambios territoriales en el centro urbano de Salcedo, Puno
Authors: Ccama Condori Hugo Anselmo 
Published: March 2022

El proceso de expansión urbana genera efectos negativos sobre los escenarios naturales, este proceso es ocasionado principalmente por el crecimiento poblacional que transforma los territorios naturales para usos urbanos. El estudio tiene como objetivo explicar los cambios territoriales como efecto del crecimiento poblacional en el centro urbano de Salcedo (Puno), entendiéndose que el crecimiento poblacional es una de las acciones humanas que transforma los territorios naturales y que genera efectos ambientales irreversibles. Metodológicamente, el estudio se basó en la descripción de la situación actual (diagnóstico), para ello se realizó el análisis territorial con apoyo de cartografía temática, referida a aspectos físico-espaciales y ambientales, para luego procesar la información en el software SIG (ARC VIEW 3.2); posteriormente se valoró la percepción de la población sobre la ocupación de territorios naturales y deterioro del medio ambiente. Los resultados obtenidos reportan que el centro urbano de Salcedo experimentó, un crecimiento poblacional acelerado en las últimas décadas, el cual incidió directamente en el incremento de su área urbana en 319 hectáreas; reduciéndose las áreas rurales naturales a 302,4 hectáreas; esta modificación en el incremento de su área urbana ha generado efectos negativos y adversos sobre el territorio natural, ocupando zonas no aptas para usos urbanos, deterioro del medio ambiente y contaminación.
RESPON PERTUMBUHAN KELAPA DALAM (Cocos nucifera) TERHADAP LAMA KEKERINGAN DI PEMBIBITAN ; RESPONSE TO TALL COCONUT (Cocos nucifera) PLANT GROWTH AT LONG DROUGHT IN THE NURSERY
Authors: Manambangtua Alfred P. , Mahayu Weda M. , Hidayat Toni S. 
Published: March 2022

Hal yang harus diperhatikan dalam penyedian bahan tanam untuk tanaman perkebunan adalah pembibitan. Salah satu masalah utama bagi pertumbuhan dan perkembangan tanaman kelapa di pembibitan adalah kekurangan air atau kekeringan. Semua aspek pertumbuhan tanaman meliputi proses fiologis, biokimia, anatomi dan morfologi terpengaruh akibat kekurangan air. Bencana kekeringan atau kemarau panjang sering terjadi di Indonesia. Sehingga penelitian ini bertujuan untuk mengetahui respon pertumbuhan tanaman kelapa terhadap lama kekeringan di pembibitan. Penelitian dilaksanakan selama 5 bulan, dimulai bulan Oktober 2019 hingga bulan Maret 2020. Lokasi pelaksanaan penilitian di lakukan di Rumah Kaca Balai Penelitian Tanaman Palma. Jl. Raya Mapanget, Manado. Penelitian menggunakan rancangan acak lengkap (RAL) dengan lima perlakuaan dan lima ulangan. Sehingga didapat dua puluh lima satuan percobaan. Perlakuan yang diuji adalah periode kekeringan yang terdiri atas: Kontrol (Disiram dari awal), 1 bulan kering, 2 bulan kering, 3 bulan kering, 4 bulan kering, 5 bulan kering. Tanaman yang mengalami periode kekeringan selama satu dan dua bulan untuk tinggi dan lingkar batang tidak berbeda nyata terhadap tanaman yang disiram (kontrol). Pada persen tanaman yang hidup terdapat tanaman yang mati pada perlakuan A4 dan A5. Untuk berat basah dan berat kering tajung perlakuan tanaman yang disiram tidak berbeda nyata pada perlakuan A1, namun berbeda nyata pada perlakuan lainnya. Pada kondisi perakaran, perlakuan A0 memiliki perakaran yang lebih banyak.
Robust Value Quantification of Enhanced Oil Recovery Methods Using Ensemble-Based Optimization
Authors: Oguntola Micheal , Lorentzen Rolf 
Published: March 2022

Summary
Over the last decades, the development of different oil reservoirs with gas or chemical enhanced oil recovery (EOR) methods have been studied, and the EOR effects of the recovery methods are found to be sensitive to fluid and rock properties in the reservoirs. The use of a single reservoir model with the assumption of known reservoir parameters is not enough to guarantee an accurate prediction of EOR effects. The best decision related to the injection strategies of EOR methods can be appropriately found using an optimization setup that accounts for the uncertainty quantification in the reservoir. In this paper, we present mathematical tools for optimizing and ranking the value of the commonly used EOR methods. The methodology is demonstrated with Smartwater, carbon dioxide (CO2), and polymer EOR methods on synthetic 2D and 3D oil reservoirs. To capture the uncertainties in the reservoirs, we use an ensemble of geological realizations obtained by engineering upscaling of the initial model. The usefulness of this study is to improve the understanding of the actual benefit of EOR methods and to provide a methodology that quickly allows users to appropriately predict EOR injection strategies that maximize the annually discounted economic values of the injected and production data. The control variables of optimization problems include EOR gas rate or chemical concentration, water rates, oil rate, or bottomhole pressures. An ensemble-based optimization method with covariance adaptation is used to solve the optimization problem. For the different reservoirs considered, we find the optimal well controls for EOR methods. A comparative study of the economic benefits of the optimal solutions of EOR methods using optimized waterflooding as a reference point is presented. CO2 is found to rank high compared with other EOR methods in both cases. Finally, we investigate the effect of different injection costs of CO2 on the optimization results of CO2 EOR methods for the 3D reservoir field.
Nonlinear Dynamic Modeling of Drillstring-Bit-Rock Coupling System Based on Bit/Rock Interaction Simulation
Authors: Han Yiwei , Kuang Yuchun , Yang Bo , Ai Zhijiu 
Published: March 2022

Summary
In this paper, based on the dynamic model of the geometrically exact drillstring in horizontal well, a nonlinear dynamic model of drillstring-bit-rock coupling system is established. First, the contact model of drillstring and borehole wall in vertical well is extended to the contact model of drillstring and borehole wall in 3D well. Then a new numerical rock model is proposed, in which rock is discretized to spherical particles and each particle behaved in three states including undeformed state, elastic deformation, and crushing state. Equivalent stiffness is used to describe the mechanical properties of rock particles. The relationship between the equivalent stiffness of rock particles and mechanical specific energy (MSE) of rock is established. Finally, the coupling dynamic model of drillstring-bit-rock is established by coupling the dynamic model of drillstring, the contact model between drillstring and borehole wall, and the bit/rock interaction model. The coupling model is spatially discretized by quadrature element method; a mixed explicit-implicit numerical integration method is used for time integration; the nonlinear equations are solved by Newton’s method; and the solving efficiency is improved by using sparse matrix and parallel computing techniques. The numerical model is verified by laboratory experiments. By the above methods, the drilling process of an actual well is simulated. The results show that the mechanical model and numerical calculation method can capture the coupling vibration phenomenon of the drillstring-bit coupling system in real-time. The innovation of this paper is to propose a new drillstring-bit-rock coupling dynamic system model, including a new bit-rock model, so that the dynamic excitation of the drillstring system in the bit section is closer to the actual situation. It provides a new idea for the research of drill string-bit coupling system and lays a theoretical foundation for drilling optimization.
Effect of Pore Structure and Capillary Number on Gas-Water Flow Patterns in Carbonate Rocks
Authors: Li Yingwen , Yang Yongfei , Dong Mingzhe , Liu Changfu , Iglauer Stefan , Kang Lixin , Yao Jun , Zhang Kai , Sun Hai , Zhang Lei 
Published: March 2022

Summary
Rock pore structure and capillary number determine gas-water flow through limestone. Limestone is of key importance for natural gas production and gas storage; however, there is still limited direct evidence on the precise influence of the pore space morphology (vugs, fractures, and homogeneous pore matrix) and capillary number. Here, we thus studied gas-water flow patterns in various limestones via in-situ X-ray microtomography combined with numerical flow simulations. Pore structure heterogeneity significantly affected the fluid migration path. Gas flowed rapidly through large pores and vugs but flowed slowly through microfractures. In contrast, water flowed through microfractures and small pores but did not enter large pores at low capillary number conditions. Water flow simulations [performed for different capillary numbers directly on microcomputed tomography (μ-CT) images] demonstrated that snap-off and dead-end corners controlled the distribution of residual gas, consistent with the experiments. In addition, the simulations showed that less residual gas distributed around dead-end corners at a low capillary number, and a part of the residual gas can be displaced by increasing viscous forces. Moreover, a power-low relationship between gas cluster volume and surface area was observed, and the gas cluster size distribution could also be fitted with a power-law correlation. In all types of tested limestones, the power-law exponents (p ≈ 0.77, τ ≈ 0.86) were lower than that predicted by simple percolation theory (which predicts p ≈ 1, τ ≈ 2.189). There was evidence that a simple percolation model was unlikely to provide reliable predictions in homogeneous porous media, and we further extended the application scope of this conclusion to heterogeneous porous media. This work therefore provides fundamental data and improves fundamental understanding of gas-water flow through limestones and aids in the further advancements of improved hydrocarbon recovery and gas storage in limestone reservoirs.