bluuebunny/crossref_metadata_2025 huggingface dataset:
Crystal structure of [(4-bromobenzyl)triphenylphosphonium] tetrabromoantimony(III), [C25H21BrP]+[SbBr4]−
Authors: Li Xue , Wang Guangyao
Published: February 2025

C25H21Br5PSb, monoclinic, P21/c (no. 14), a = 10.5893(1) Å, b = 14.7743(2) Å, c = 18.9737(3) Å, β = 102.279(1)°, V = 2900.52(7) Å3, Z = 4, R
gt(F) = 0.0481, wR
ref(F
2) = 0.1362, T = 293(2) K.
Numerical stability analysis of incompressible boundary layers over ribbed surfaces
Authors: Demyanko Kirill V. , Klyushnev Nikita V. , Boiko Andrey V. , Nechepurenko Yuri M.
Published: February 2025

A technology for numerical analysis of the local biglobal stability of laminar incompressible boundary layers over streamwise-ribbed surfaces is proposed. Within its framework, the stability is studied using the locally-parallel approximation and Floquet theory. The work of the proposed technology is demonstrated by the example of a boundary layer over a streamwise-ribbed plate of finite thickness. For the considered values of ribbing parameters, it is shown that the presence of ribbing increases the growth of disturbances compared to a plate without ribbing, thereby promoting the natural laminar–turbulent transition.
Co-rumination and depression: A systematic review and future directions
Authors: Badawi Jessica C. , Ingram Rick E.
Published: February 2025

Introduction: Literature on risk for depression largely focuses on intrapersonal risk factors, especially rumination, yet identifying interpersonal behaviors that increase negative affect may have important implications for understanding depression and risk for depression. Co-rumination is an explicitly interpersonal process that entails extensive and repetitive discussion of problems and associated negative affect within a dyad. Co-rumination has been well documented in depression, and may have important implications for understanding the disorder, but to date there has been no systematic review of the co-rumination literature, making it difficult to ascertain how co-rumination might be related to depression, and possibly to depression vulnerability. Method: Accordingly, we present a systematic review and appraisal of the literature on co-rumination, with suggestions for future research. Results: Co-rumination appears associated with depression risk across development through stress generation, parent-child interactions, and depression contagion. Existing research is consistent with the field's current understanding of several depression vulnerability factors, but additional research is needed to replicate and extend these findings. Discussion: Our review suggests that among the multitude of variables associated with risk for depression, co-rumination may deserve a prominent place.
Antineoplastic effects of icaritin: molecular mechanisms and applications
Authors: Luo Piao , Zhang Hao , Cheng Guangqing , Wang Ping , Wong Yinkwan , Chen Junhui , Fang Jingya , Li Wenhui , Cao Ting , Liu Bin , Meng Kun , Zhang Qian , Wang Jigang
Published: February 2025

Icaritin (ICA) is a prenylflavonoid natural product extracted from plants of the Epimedium genus. The approval of ICA softgel capsules as a class 1.2 traditional Chinese medicine (TCM) innovative drug represents a major advancement offering a novel therapeutic approach for patients with advanced hepatocellular carcinoma (HCC). Class 1.2 TCM innovative drugs generally denote extracts and formulations derived from single plants, animals, minerals, or other substances. ICA exhibits diverse pharmacological effects, encompassing anti-inflammatory, immune-regulatory, anti-oxidation, anti-osteoporosis, anti-depression, and notably anti-cancer properties. This review presents a comprehensive overview of the molecular mechanisms underlying the anti-cancer properties of ICA, and further highlights recent progress in use of ICA in cancer research, discusses present challenges, and examines potential opportunities for ICA application and further development.
A distinct Down-to-Up transition assembly in retrosplenial cortex during slow-wave sleep
Authors: Opalka Ashley N , Dougherty Kimberly J , Wang Dong V
Published: February 2025

Understanding the intricate mechanisms underlying slow-wave sleep (SWS) is crucial for deciphering the brain's role in memory consolidation and cognitive functions. It is well-established that cortical delta oscillations (0.5–4 Hz) coordinate communications among cortical, hippocampal, and thalamic regions during SWS. These delta oscillations feature periods of Up and Down states, with the latter previously thought to represent complete cortical silence; however, new evidence suggests that Down states serve important functions for information exchange during memory consolidation. The retrosplenial cortex (RSC) is pivotal for memory consolidation due to its extensive connectivity with memory-associated regions, although it remains unclear how RSC neurons engage in delta-associated consolidation processes. Here, we employed multi-channel in vivo electrophysiology to study RSC neuronal activity in freely behaving male mice during natural SWS. We discovered a discrete assembly of putative excitatory RSC neurons (∼20%) that initiated firing at SWS Down states and reached maximal firing at the Down-to-Up transitions. Therefore, we termed these RSC neurons the Down-to-Up transition Assembly (DUA), and the remaining RSC excitatory neurons as non-DUA. Compared to non-DUA, DUA neurons appear to exhibit higher firing rates, larger cell body size, and lack monosynaptic connectivity with nearby RSC neurons. Furthermore, optogenetics combined with electrophysiology revealed differential innervation of RSC excitatory neurons by memory-associated inputs. Collectively, these findings provide insight into the distinct activity patterns of RSC neuronal subpopulations during sleep and their potential role in memory processes.

Significance statementNewly formed memories must undergo memory consolidation, integrating hippocampal-dependent information into pre-existing cortical networks. Recent research highlights a cortical-hippocampal-cortical loop during SWS in this process, indicating the cortex's role in initiating memory consolidation. To investigate how the RSC contributes to SWS and associated consolidation processes, we characterized a novel assembly of RSC neurons that are highly active during SWS Down states, preceding the activity of other RSC neurons during Down-to-Up transitions. We further explored how RSC neurons receive innervation from memory-associated inputs. Our findings shed light on the RSC's role in orchestrating SWS oscillations, revealing a unique assembly of cortical excitatory neurons in potentially promoting SWS Up states.
Consistencia interevaluador en la evaluación de una app móvil para Educación Musical Básica: estudio piloto
Authors: León-Garrido Antonio , Barroso-Osuna Julio Manuel , LLorente-Cejudo Carmen
Published: February 2025

El avance de la tecnología en los contextos educativos, especialmente a través del uso de dispositivos y las aplicaciones móviles, ha transformado significativamente el panorama educativo. Por estos motivos, se planteó como objetivo evaluar el nivel de acuerdo en la entre evaluadores respecto a una aplicación móvil diseñada para el aprendizaje de conceptos básicos de la música. Para ello, se empleó una metodología basada en el Coeficiente de Correlación Intraclase (CCI) y el análisis ANOVA con Friedman como técnicas principales de análisis. El estudio utilizó un instrumento específico de evaluación de apps móviles de Educación Musical. La muestra estuvo compuesta por 60 docentes especializados en música, de los cuales 28 eran docentes universitarios y 32 eran maestros de Educación Primaria. Los resultados evidenciaron un alto nivel de acuerdo entre todos los evaluadores, lo que demuestra una fuerte consistencia y confiabilidad en las evaluaciones realizadas. Esto hallazgos respaldan tanto la solidez de las valoraciones emitidas sobre la aplicación móvil como la alta fiabilidad del instrumento empleado para su evaluación.
ОПРЕДЕЛЕНИЕ СТРУКТУРЫ ПОРОДНОГО МАССИВА В ОКРЕСТНОСТИ ТОННЕЛЯ ПО ФАЗОВЫМ СКОРОСТЯМ ПОВЕРХНОСТНЫХ СЕЙСМИЧЕСКИХ ВОЛН
Authors: СЕРДЮКОВ А.С. , ЕФРЕМОВ Р.А. , ЯБЛОКОВ А.В. , КОРМИН М.Н. , АКУЛОВ К.Б.
Published: February 2025

Проведены натурные исследования геомеханического состояния массива горных пород в окрестности законсервированного железнодорожного тоннеля методом многоканального анализа поверхностных сейсмических волн. Для интерпретации полученных данных выделены и проанализированы спектральные дисперсионные изображения волн, распространяющихся вдоль тоннеля. Это позволило установить распределение скоростей волн во вмещающих породах и выявить низкоскоростные участки. Результаты исследований подтверждают применимость метода определения структуры и диагностики состояния приконтурного массива подземных сооружений.

The field research of the geomechanical behavior of rock mass was carried out in the neighborhood of an abandoned railway tunnel by means of multi-channel analysis of seismic surface waves. For the interpretation of the results, the spectral dispersion images of waves along the tunnel were selected and analyzed. That made it possible to obtain the velocity patterns of waves in enclosing rock mass, and to identify the low-velocity zones in it. The results prove the applicability of the method of determining structure and condition of adjacent rock mass surrounding underground structures.
ОЦЕНКА ФЛОТОАКТИВНОСТИ ТИОЛОВЫХ СОБИРАТЕЛЕЙ НА ОСНОВЕ АНАЛИЗА КИНЕТИЧЕСКИХ КРИВЫХ ФЛОТАЦИИ ПИРИТА
Authors: ГОРЯЧЕВ Б.Е. , ШЕХИРЕВ Д.В. , ЧЖО З.Я. , НАИНГ Л.У.
Published: February 2025

В качестве собирателей при флотации пирита использованы бутиловый ксантогенат калия и бутиловый дитиофосфат натрия. Влияние природы сульфгидрильного собирателя на флотируемость пирита изучалось на его навесках флотационной крупности - 74+ 44 мкм. Приведены результаты исследования пенной флотации пирита с добавлением в операцию одного из двух традиционных сульфгидрильных собирателей, которые проявляют близкое собирательное действие в процессе обогащения пирита при рН 8. На основе анализа кинетических кривых флотации пирита предложен новый подход к оценке флотоактивности тиоловых реагентов.

Test flotation of pyrite used potassium butyl xanthate and sodium butyl dithiophosphate as collectors. The study of the influence exerted by the nature of a sulfhydryl collector on the flotation ability of pyrite included pyrite samples -74+44 µm in size. The findings on froth flotation of pyrite with addition of one or two traditional sulfhydryl collectors which display similar collecting action in treatment of pyrite at pH 8 are described. From the analysis of the kinetic curves of pyrite flotation, a new approach to the assessment of flotation activity of thiol collectors is proposed.
СЕЙСМИЧЕСКИЕ ИССЛЕДОВАНИЯ ШАХТНЫХ ПОЛЕЙ В УСЛОВИЯХ КАРАГАНДИНСКОГО УГОЛЬНОГО БАССЕЙНА
Authors: ОЛЕНЮК С.П. , ХМЫРОВА Е.Н. , БЕСИМБАЕВА О.Г.
Published: February 2025

Рассмотрены результаты внутрипластовых сейсмических исследований в период эксплуатации месторождения на шахтах “Казахстанская”, “Абайская”, “Им. Кузембаева” Карагандинского угольного бассейна с целью изучения и прогнозирования геологических нарушений угольного пласта. Сейсморазведочные работы проводились методами отраженных, проходящих волн, сейсмической локации, а также их сочетанием. Полученные практические результаты внутрипластовой сейсморазведки в сложных горно-геологических условиях показали высокую эффективность применения рассматриваемых методов, что позволило уточнить наличие и положение, а также простирание ожидаемых нарушений, выявить отсутствие непрогнозируемых геологических нарушений, определить зоны изменения гипсометрии угольного пласта и другие аномалии.

The article discusses in-situ seismic tests carried out during operation in the mines Kazakhstan, Abay and Kuzembaev in the Karaganda Coal Basin for studying and predicting geological faults in coal seams. Seismic testing used the methods of reflection survey, transmitted waves, seismic location, as well as their combinations. The practical results of the in-situ seismic testing in complex geological conditions proved the efficiency of the listed methods, and enabled adjustment of the presence, position and stretch of expectable faults, revealed the absence of unpredictable faults, and detected the zones of change in hypsometry of coal seams, as well as other anomalies.
Inteligencia artificial en publicaciones científicas. Ética e integridad ante un desafío emergente
Authors: Ramos-Castillo José
Published: February 2025

La aparición de la inteligencia artificial (IA) constituye un enorme desafío para la edición de las publicaciones científicas. Diversas herramientas de IA se han utilizado en redacción y comunicación académica en años recientes. Autores y editores las utilizan para optimizar la gramática, ortografía y la detección de plagio, como es el caso de Grammarly©, ProWritingAid©, Hemingway Editor©, Turnitin©, entre otros (1). Sin embargo, con el creciente desarrollo y aplicación de la IA en el panorama actual, incluyendo la investigación y su producto final, la publicación científica, se plantea la preocupación en torno a la posibilidad de reemplazar la cognición humana para estos fines (2).
Características de los donantes, disponibilidad de hemocomponentes y tendencias de marcadores infecciosos en el Banco de Sangre de Loreto, 2018 - 2022
Authors: Rengifo Peña Andy , Paredes Arbildo Julio , Lopez Mesia Jean P. , Zevallos Karine , Marin Johan
Published: February 2025

The evaluation of donors and blood components ensures quality therapy. Objective. To characterize donors, describe the availability of blood components, and analyze trends in transfusion-transmissible infections (TTIs). Methods. A descriptive-retrospective study was conducted using data from the Loreto Regional Blood Donation Center (2018–2022). Applicants aged over 18 years, screened serologically for HIV, hepatitis B, hepatitis C, HTLV, syphilis, and Chagas disease, were included. sociodemographic variables, deferrals, production, disposal of blood components, and TTI prevalence were analyzed through descriptive analysis. Results. In 2022, 72.5% of donors were eligible and 21.9% were deferred (2020), with low hemoglobin as the leading cause (30%). Male participation predominated (74.3%), as did the 25–44 age group (60%). Blood component production increased from 3487 to 7568 units, with red blood cell concentrates being the most prominent (68.7%). Discards totaled 1583 units, primarily due to expiration (68.4%) and TTIs (29.3%). Syphilis was the most common TTI (1.4%), followed by HTLV (0.5%) and Chagas (0.4%). Conclusion. The study evidenced a sustained increase in the production and demand for blood components. The main characteristic of the donors was male predominance and age between 25 and 44 years. The main causes of elimination were expiration and transfusion-transmissible infections (TTIs), with syphilis standing out as the infection with the highest prevalence and the most marked upward trend during the analyzed period.
Prevención, diagnóstico y tratamiento del golpe de calor
Authors: Huaman Sanchez Karen , Socualaya Sotomayor Patricia , Flores Lovon Kevin , Silva Fiestas Jorge E. , Gutierrez Ericson L.
Published: February 2025

Heat stroke is a serious medical condition that can lead to multiple organ failure and even death if not identified and intervened in a timely manner. The objective is to narratively synthesize the best available evidence regarding the prevention, diagnosis and treatment of heat stroke. A systematic search was conducted in Pubmed/MEDLINE and in repositories of standard-setting bodies. Four clinical practice guidelines and eight technical documents were included. The diagnosis of heat stroke is based on a body temperature above 40°C accompanied by clinical symptoms. Prevention focuses on self-care, avoiding excessive exposure to heat, maintaining proper hydration and wearing appropriate clothing. In case of heat stroke, it is essential to move the patient to a cool environment, hydrate and apply physical cooling methods. Treatment is organized in two phases. The first phase is pre-hospital, which includes stabilization, passive cooling and intravenous fluids. The second phase is the hospital phase, where cooling is continued until a rectal temperature of 39°C is reached. Fluids should be administered for hemodynamic support and antipyretics should be avoided. In conclusion, the present narrative review has identified strategies for the diagnosis, prevention and treatment of heat stroke, based on the best available evidence.
Relación entre los niveles de hemoglobina en niños menores de 36 meses con anemia y el grado de creencia del cuidador sobre adherencia al sulfato ferroso
Authors: Vildózola Herman , Pillaca Karol Jhanet , Placencia Maritza
Published: February 2025

Introducción. La anemia infantil es un problema de salud pública prevalente en Perú. Se ha propuesto que la creencia del cuidador sobre adherencia al sulfato ferroso podría influir en la efectividad del manejo de la anemia. Objetivo. Evaluar la relación entre los niveles de hemoglobina en niños menores de 36 meses con anemia y el grado de creencia del cuidador sobre adherencia al sulfato ferroso. Métodos. Se realizó un estudio descriptivo, correlacional y prospectivo en 67 niños menores de 36 meses con anemia ferropénica atendidos en el Centro de Salud de Quinua, Ayacucho, Perú. Se utilizaron un hemoglobinómetro para medir la hemoglobina y una escala de creencia validada para evaluar la adherencia al sulfato ferroso de los cuidadores. Resultados. No se observó una correlación significativa entre la creencia sobre adherencia al sulfato ferroso del cuidador y los niveles de hemoglobina en los niños. Conclusión. Aunque no se identificó una correlación significativa, fortalecer la adherencia al sulfato ferroso sigue siendo crucial en el manejo integral de la anemia infantil.
Publicación científica de tesis doctorales de una universidad peruana y el uso de las prioridades de investigación en salud
Authors: Chávez Velásquez Manuel Eduardo , Araoz Silva Yola Damiana , Diaz del Olmo Mariana Bouroncle , Vizcarra Vizcarra Cristhian Adolfo
Published: February 2025

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Evaluación de dos pruebas inmunocromatográficas para el diagnóstico de la enfermedad de Chagas
Authors: Cornejo William , Alva Pilar , Roldán William , Espinoza Irma , Ruelas Nancy
Published: February 2025

Introducción. La tripanosomiasis americana es una enfermedad parasitaria desatendida que afectaría entre siete y ocho millones de personas principalmente en 21 países de las Américas, incluido el Perú. Es necesario contar con pruebas diagnósticas confiables, rápidas y fáciles de usar en las áreas endémicas de la enfermedad de Chagas como parte de la estrategia para controlar la enfermedad.  Objetivo. Comparar el desempeño de la prueba rápida inmunocromatográfica OnSite Chagas Ab Rapid test con la prueba rápida inmunocromatográfica SD Bioline Chagas Ab Rapid en muestras de suero de participantes peruanos, utilizando la prueba de inmunofluorescencia indirecta (IFI) y el ensayo de inmunoabsorción enzimática (ELISA) como referencia para el diagnóstico de la enfermedad de Chagas. Métodos. Estudio transversal realizado con 114 muestras de suero, de las cuales 36 y 38 fueron positivas y negativas, respectivamente, por métodos serológicos convencionales (IFI y ELISA), y 40 correspondieron a muestras de pacientes con otras infecciones parasitarias (IFI y ELISA negativas). Resultados: La especificidad fue de 97,4% [intervalo de confianza (IC) del 95% IC95% = 90,0 - 99,8] y 98,7% [IC95% = 92,3 - 100], y la sensibilidad fue de 83,3% [IC95% = 67,6 - 92,4] y 72,2% [IC95% = 55,8 - 84,2], para OnSite Chagas Ab Rapid test y SD Bioline Chagas Ab Rapid, respectivamente. El valor predictivo positivo y negativo fue de 93,8 [IC95% = 85,4 - 100] y 92,3 [IC95% = 86,4 - 98,2], respectivamente para OnSite Chagas Ab Rapid test y 96,3 [IC95% = 89,2 - 100] y 88,5 [81,8 - 95,2], respectivamente para SD Bioline Chagas Ab Rapid. La eficiencia diagnóstica de las pruebas varió entre 90,4% y 92,9%. Conclusiones. Las sensibilidades de ambas pruebas rápidas inmunocromatográficas fueron bajas en la muestra estudiada, por lo tanto, son inadecuadas para ser incorporadas como herramientas para el diagnóstico o tamizaje de la enfermedad.
Incidencia acumulada y distribución espaciotemporal de la malaria en el Perú en el periodo 2000 al 2022
Authors: Vidarte Cano Rodrigo Rafael , Guerra Cabrera Juan Manuel , Segami Makiya Jose Masayoshi , Rojas Ramos Claudia Andrea , Romero Espinoza Joaquín Rodrigo , Molina Rosas Oscar Renzo , Díaz Salazar Guido Enrique , Medrano Colmenares Ricardo Carlos
Published: February 2025

Introducción. La malaria es una enfermedad metaxénica causada por el Plasmodium spp., de los cuales, las especies más prevalentes en Perú son el P. vivax y P. falciparum. En Perú fueron reportados 22 617 casos de malaria en el 2023. Objetivo. Describir la evolución de los casos de malaria en Perú entre los años 2000 y 2022, caracterizar a la población afectada y estimar la  incidencia acumulada (IA) en los periodos 2000-2005, 2006-2011, 2012-2017 y 2018-2022. Métodos. Usamos un diseño descriptivo observacional longitudinal de fuente secundaria. Los datos fueron extraídos de la base de datos llamada «Vigilancia epidemiológica de Malaria». Se estimó la IA usando la base de datos y la población estimada anual por departamentos brindada por el Instituto Nacional de Estadística e Informática. El estudio abarcó la totalidad del territorio peruano, y analizamos los casos individuales de malaria.  Resultados. La IA por 1000 habitantes en el departamento de Loreto fue superior en comparación a los demás departamentos en todos los periodos, llegando a un pico máximo de 51,84 en el periodo 2012-2017 (6,28, 12,45, 51,84, 22,93). Madre de Dios presentó un pico de 9,77 por 1000 habitantes en el periodo 2006-2011, luego bajó a 1,13 en el periodo 2012-2017. Además, Amazonas tuvo un incremento de la IA por 1000 habitantes en el periodo 2018-2022, llegando a 3,02. Conclusión.  Loreto fue el departamento con mayor riesgo de infección de malaria a lo largo de los periodos 2000-2005, 2006-2011, 2012-2017 y 2018-2022.
El estado actual de crisis de la arqueología posprocesual. Un análisis desde el modelo de desarrollo teórico
Authors: Guevara Chumacero Miguel
Published: February 2025

En este artículo se realiza un análisis epistemológico de los componentes teóricos de la arqueología posprocesual a lo largo de su historia. Utilizo el modelo de desarrollo que indica las etapas que poseen las teorías científicas. El análisis describe que la inconsistencia entre estos componentes ha conducido a la arqueología posprocesual a una situación de crisis.
El Intermedio Temprano y las relaciones sociales en el extremo norte de los Andes centrales. Informe preliminar de las excavaciones en Cerro La Plaza de Portachuelo de Culucán, provincia de Ayabaca, Piura
Authors: Martini Sarah Joy , Espinoza Escobar Luis Javier , Lopez Cordova Andrea Pierina , Nicolas Lorenzo Dennis
Published: February 2025

The PAPAYA archaeological investigation project excavated the multicomponent site Cerro La Plaza de Portachuelo de Culucán in Ayabaca, Peru with the goals of understanding the pre-Inca occupations of the Piura highlands in the extreme north of the Central Andes and interactions with the societies of the Northern Andes. Contrary to ex- pectations of an Early Horizon (800-200 BCE) occupation, the contexts, material culture, and radiocarbon dates indicate occupation from the 3rd/4th through 7th centuries CE. The characteristics of the site and its material assemblage suggest relations with the Vicús culture of the Alto Piura, the northern coast of Peru and the southern part of Ecuador. Stronger connections are present at a regional level with the cemeteries excavated by Mario Polia close to the village of Olleros.
Elaboración del perfil patológico de niños en edad escolar de la zona urbano marginal de Machala, expuestos a pesticidas utilizados en cultivos de banano en Machala, Ecuador (2013-2014)
Authors: Santos Luna Jovanny , Iraizoz Barrios Ana María , Falconí Peláez Sandra , Tovar Torres María Clarisa , Chávez Machado Jesús Ángel
Published: February 2025

This paper presents the results obtained in a study conducted in the period 2013-2014 to determine the pathological profile of a sample of 200 schoolchildren from two urban-marginal schools in Machala, El Oro province, Ecuador, aged between 4-12 years, exposed to contact with pesticides used in the fumigation of banana crops.Individual characteristics of the children analyzed, such as sex, nutritional status and social stratum, among others, were determined and studies of blood cytometry and plasma cholinesterase were performed.Laboratory tests were not conclusive for the diagnosis of chronic intoxication, which may be related to the type of pesticide used, the time of exposure and the absence of reference values for this age group differentiated by sex.The symptomatology determined in almost all children is related to muscarinic or parasympathetic symptoms that occur in pesticide poisonings.
Estudio de la electrocoagulación para controlar la turbidez y el pH en el tratamiento de efluentes minero metalúrgicos polimetálicos
Authors: Calderón Marilú , Aramburú Vidal
Published: February 2025

Electrocoagulation is an electrochemical method to remove contaminants, using an anode and a cathode, where chemical and physical reactions occur, between ions with opposite charge, which facilitates the attraction of the individual particles that form a flocculus with Greater density than the individual particles, being able to decant them spontaneously to form the anodic mud that will be treated like dangerous solid residue. The extraction of mineral concentrates generates effluents and when the variables for contaminated discharges are not controlled, the rivers and the sea are impacted. For hundreds of years, electrocoagulation has been discovered as a treatment for industrial waters and is now taking up the interest of the application of this technology, because of its low cost compared to other technologies. In Colombia this technology is applied in the textile industry in the process of natural and synthetic fibers, dyeing and stamping, as well as in the agricultural sector. It is thus that electrocoagulation is profiled, as a process that can be innovated for the treatment of water from the metallurgical mining processes and optimize control parameters. The reuse and recirculation are operations that help in the management of the water, but it is necessary to carry out treatments to the waste water so that when discharging them, the pollution of the sea and the rivers is avoided, in this way the water resource would be protected Which in the future is known to be scarce. The hypothesis raised in this research is that electrocoagulation will allow control of turbidity and pH in the treatment of metallurgical mining effluents, which will be a contribution for companies to comply with the mining metallurgical discharges law. The result before treatment was: absorbance 2,223 and 2769,175 mg / l, total suspended solids, pH 10, pH meter efficiency 95%. After treatment was: absorbance 0.045 and 46.68 mg / l of total suppressed solids, pH = 8, pH meter efficiency 98%. Area 0.0925m2, Anode and Cathar side 0.3041 m2, Current current 86.47 A / m2, 2 V and 5 A The objective of this research was to study electrocoagulation to control turbidity and pH in the treatment of polymetallic metallurgical mining effluents The result will be the uliram methodology for the electrocoagulation applied to polymetallic metallurgical mining effluents. The participating units are full-time and full-time faculty and graduate students.
Vulnerabilidad a nivel de ecosistema de Páramo frente al Cambio Climático en la zona de Igualata Parroquia San Isidro, Cantón Guano Provincia de Chimborazo
Authors: Echeverría Magdy , Rosero Carlos , Bravo Lelys
Published: February 2025

The present study has as purpose to establish an index and a level of vulnerability associated with Páramo ecosystem to the effects of climate change through the identification of the different hazards that could cause an impact on this system. To achieve a reliable and concise analysis was delimited the study area by three geographical approaches: ecosystem, data collected of carbon and bordering features, data both t emperature and current precipitation are generated based on climate models implemented by the Ministry of the Environment through meteorology Stations validated at the national level by the National Institute of Meteorology and Hydrology, also is achieved in the present study to analyze the variable precipitation through the meteorology station M390 (Urbina). Another variable considered in this study is the likely future climate where are used data provides by the Japanese Climate Model TL959. The vulnerability in this study is focused on the analysis of 8 indicators under the conceptualization of the 3 elements of vulnerability, ie; Exposure, sensibility and adaptability. It is necessary to take into account that is determined in the same way the potential impact as part of this process. The indicators are focused under the analysis of scales (1-3) for the analysis of the elements of vulnerability and (0-100) for Total vulnerability index. The study found an equivalent of vulnerability in the ecosystem of 62.5 which is considered as high level of vulnerability.
Determinación de metales pesados en los cuerpos de agua del Área de Conservación Regional Humedales de Ventanilla, Región Callao, Perú
Authors: Fajardo Vidal Narda , Solís Acosta Hilda , Gil Villacres Fernando
Published: February 2025

Heavy metals are often found as contaminants in the water. Accordingly, the current study was conducted to determine heavy metals (Hg, Cd, Pb, As) in water bodies from the Regional Conservation Area Wetlands of Ventanilla by the method of Inductively Coupled Plasma (ICP). Water samples were collected at 17 sampling stations for three monitoring periods for the analysis of four variables of the physico-chemical quality of the water bodies. The presence of these elements in water are important for environmental and health of human communities associated with water bodies. Some metals are quickly trapped by sediments, so its presence in the water column is indicative of recent contamination. The physicochemical characteristics found were compared with the proposed concentration limits of the Peruvian law of 2008 and 2015. In the case of heavy metals, lead, arsenic and mercury have higher values so that their potential sources are discussed.
Método de investigación geológico-geotécnico para el análisis de inestabilidad de laderas por deslizamientos zona Ronquillo-Corisorgona Cajamarca-Perú
Authors: Rodríguez Cruzado Reinaldo , Tolentino Iparraguirre Víctor
Published: February 2025

The research analyzes the geostructural, geomorphological and geomechanical behavior of rock masses of Farrat, Inca, Chulec and Pariatambo Formations, found in Ronquillo-Corisorgona area massifs have unstable slopes by strong fracturing caused by the regional tectonics and local as well as superficial and deep weathering conditions that have determined geodynamic events as a paleodeslizamiento approximately 500 meters long and slopes between 19° and 45°, intermediate landslides, disturbed areas and a recent slide; evidence to determine the likelihood of a future large sliding in the Cerro Ronquillo. Consequently aimed to analyze the slope instability associated with internal factors, and their intrinsic characteristics conditioned by the material properties and resistance, and extrinsic, related to the morphology of the slopes and environmental conditions; and external or triggers such as water infiltration and seismicity. By correlating these variables by Geostructural analysis of information from each control point using Software Dips and incidence of hydrological variable parameters precipitation and infiltration, we obtained safety factors in three geological sections using geomechanical parameters, water table and seismicity, according Bieniawski89 and Software RocData, having minimum and maximum FS 0.524 1,609. Tested the hypothesis by correlation and causality conditions geological, geomechanical and numerical models, which the Geological and Geotechnical Operational and Conceptual Model of Instability Hillsides essence of the investigation had raised initially defined.
Modelo matemático para determinar el índice de inestabilidad de suelos arcillosos en laderas aprovechables para transporte carrozable, Huaraz – Ancash
Authors: Tarazona Claudia
Published: February 2025

The slopes of clayey soil and its characteristics do not allow behave in a tough way to geodynamic agents, generating instability by geological factors, similarly, the external manifestation of processes creates serious difficulties in the sustainability of transit, and physical insecurity people and vehicles by her passing, so the need to quantify these features so it can establish in the future a solution or improvement to these types of soils for roads and with the effectiveness of evaluation using mathematical models we can to determine the technical solution to propose. The mathematical model developed, used the endogenous variable displacement (I) and exogenous variables, Moisture content (W), permeability (K), density (ρ) and overload (SC), leading to the following linear regression equation.The verification technique with pre-test and post-test, was performed by involving control groups and experimental before groups and after application of the formulated linear modeling, evaluated and processed, resulting in a total displacement of the slope, 0.16 m at 3.5 months, meaning that the slope sampled presents a Slow Instability Index.
Microzonificación urbana y desarrollo sostenible territorial: caso de Puerto Bolívar-Ecuador
Authors: Berrú Juan C. , Lapo Byron , Chávez Jesús A.
Published: February 2025

Rural environmental microzonation is a way to plan the land use within particular urban area, based on the precepts of sustainable development, it becomes important in developing countries where land use planning is essential. There are several ways and tools to carry out such plans, the choice of methodology will determine the success or failure of micro-zoning, so the choosing and applying techniques and tools for this are the main concern when planning begins. Procedures based on three phases arise in this review, such as preparation phase, diagnostic phase and proposal phase. Tools such as use of drones, establishments of orthophoto, GIS development, participatory techniques, scene construction, among others are exposed. It is showed the case of Puerto Bolivar in Ecuador, whose population settlement stands at seaport, accompanied of the high tourism potential and economic movement.
Avaliação da potência de um protótipo de aerogeradortipo savonius
Authors: De Matos Lucas , Falcão Goncalves Jorge Rafael , Mallqui Espinoza Fidel Romel
Published: February 2025

The objective of this article is to construct a prototype of a wind turbines with vertical axis type Savonius us-ing materials that are easily accessible and available on the market. Due to the increase in energy demand in Brazil, other sources have been sought for the genera-tion of energy, especially renewable sources since there is an increasing concern for the environment and the attempt to mitigate gas emissions of fossil origin. Wind energy in Brazil has presented an excellent alternative of electric power generation due to the high potential of wind efficiency. The present work aims to construct a prototype of wind turbines of a vertical axis of the type Savonius using materials of easy access and available in the market aiming a low cost in the construction of the same one. Savonius vertical axis aerogenerators are known to be simple, both in terms of construction and operation. They have the power conversion devices at the base of the wind turbine, in which it facilitates the operations of possible maintenance. In addition, in this turbine model no turbine orientation devices are re-quired, but since they are low-height wind turbines, they have lower yields due to the quality of the winds near the ground. In this project, the prototype is being as-sembled with ¾-inch diameter steel tubes and a struc-ture of approximately 1.3 meters, and the blades were constructed using 1 millimeter-thick aluminum. The structure is being designed in such a way that the tur-bine can be easily moved so that it is possible to per-form tests in several places aiming the behavior in dif-ferent types of wind. The connection of the wind turbine to the generator will be made by pulleys of different sizes interconnected by a belt. In addition, the project will use a low-cost generator, where it will be possible to draw the data through a multimeter. The project aims to evaluate the power of the prototype of the aerogener-ator in different environments aiming at a low cost in construction.
Incidencia de la pesca artesanal en la contaminación de la Playa del Cantón Puerto López, de la Provincia de Manabí - Ecuador
Authors: Osejos Merino Miguel Ángel , Merino Conforme Martín Verisimo , Merino Conforme Monserrate Cristina
Published: February 2025

The following research was conducted on the beach of Puerto Lopez town located in the province of Manabí. In this research the impact of artisanal fisheries in the pollution of the beach during the months of February to July of this year. The information was collected using signing, direct observation and survey. As results of this study ten areas of fishing, where fishermen perform their work, having greater incidence of fishing cauldrons of Bollita and Punta Mala, fishing gear used by artisanal fishermen are varied, being the most used, trammel surface and bottom, these gear used in artisanal fishing activity suggest evidence of contamination residue of different type in beach areas the same that cause air pollution and this can be perceived in different areas of the beach odors also harm marine species, the combination of these problems end not pretty the place, what is a tourist place visited. With the analysis of these results we proceeded to raise the proposed Fishery Management Plan for artisanal fishermen of Puerto Lopez town.
Identificación de minerales de alteración hidrotermal aplicando métodos hiperespectrales a imágenes multiespectrales
Authors: Chacón Abad Néstor , Mayor Pastor Santiago
Published: February 2025

Advance spaceborne thermal emission and reflection radiometer (aster) is the first sensor with multi band observation in thermal infrared region (8-12 micrometers) with 90 meters of spatial resolution and 5 spectral bands specially designed to discriminate rocks from earth crust. Different process were applied in order to discriminate alteration minerals and rock groups by using not only the thermal infrared band but also the visible and near infrared bands.The area of study is located is situated in the Department of Cuzco in the southern portion of the Peru Tertiary Volcanic Belt and located 170 kilometres northwest of Arequipa. The area lies within the Peruvian altiplano at an altitude of 4,470 to 5,370 metres. The availability of multispectral data from the satellite- borne ASTER (advance Spaceborne Thermal emission Reflection Radiometer) instrument has provided and increased potential for mapping hydrothermal alteration systems.The ASTER instrument has six bands in the Swir region strategically positioned to map distinctive absorption features of alteration minerals with Al- OH and Mg-OH bonds. That permits to interact with the Terra Spec.
Evaluación de la contaminación de las aguas del río Yamanigüey
Authors: Dunán-Avila Pedro , Fernández-Rodríguez Moraima , Riverón-Zaldívar Amalia Beatriz , Bassas-Noa Pedro Rafael
Published: February 2025

Water is essential for the economy and community welfare, but its quality can be affected by natural and human factors. The present research aimed to analyze water contamination in the Yamanigüey River through contamination indexes such as organic matter, suspended solids, pH and Trophy, given that it is one of the most important rivers in Moa. Twelve samples were collected to initially evaluate their physicochemical and bacteriological properties according to the Cuban Standard (NC 1021, 2014) "Communal hygiene - water supply sources - quality and sanitary protection", the Cuban Standard (NC 827, 2017) "Drinking water - sanitary requirements" and the World Health Organization (WHO, 2011) standard "Guidelines for the quality of water for human consumption", followed by the application of the contamination indexes. As main results it was obtained that, according to the Cuban Standards evaluated and the World Health Organization Standard, the waters are both below and above the maximum and minimum acceptable limits. We concluded that the waters of the Yamanigüey River are classified in waters with medium, low and no degree of contamination according to the evaluated indexes.
Contaminación hídrica por metales pesados en la cuenca alta del río Moche debido a pasivos ambientales mineros y propuesta de remediación
Authors: Malo Méndez Sarai Masako , Aduvire Pataca Osvaldo
Published: February 2025

La presente investigación busca identificar el grado de contaminación hídrica por metales pesados en la cuenca alta del río Moche a causa de los pasivos ambientales mineros. Para ello, se analizaron muestras de agua en estaciones de monitoreo ubicadas aguas arriba y aguas abajo de la zona de vertimiento de los drenajes ácidos. Los resultados obtenidos exceden los límites establecidos por el estándar de calidad de agua para la categoría 3 [D1: Riego de cultivos de tallo alto y bajo], con valores de Aluminio (70.48 mg/L), cadmio (3.43 mg/L), cobalto (0.46 mg/L), cobre (31.58 mg/L), manganeso (32.16 mg/L), plomo (1.26 mg/L), zinc (109.50 mg/L) y un pH de 3.69.
Con base en la información obtenida de los monitoreos de calidad de agua realizados por la Autoridad Nacional del Agua (ANA), en la estación RChan1, ubicada aguas arriba de la descarga de la quebrada Agua Dulce, los valores se encontraron dentro del estándar de calidad de agua para la categoría 3. Sin embargo, en las estaciones QADul1 y RMoch12 se registraron concentraciones de metales y un pH de 2.89, lo cual está fuera de los límites permitidos por la categoría 3. Estos resultados evidencian el estado crítico actual de la cuenca alta del río Moche.
Provincia de Chancay (Lima): apogeo y desaparición
Authors: Miranda Valdivia Franklin
Published: February 2025

La provincia de Chancay, entre los años cuarenta y sesenta del siglo veinte, respecto a las otras provincias de Lima fue la que más creció en población, pasando de ser una sociedad rural a una sociedad urbana; transformándose así en un eje económico debido a las migraciones rurales desde las provincias andinas de Lima, Áncash, Huánuco y Pasco y el potencial de sus amplios y fértiles valles, en las cuencas de Pativilca, Huaura, Supe y Chancay, lo que acrecentó la producción agroindustrial, comercial e industrial pesquera. Los intensos movimientos sindicales y de yanaconas precipitaron las reformas agrarias mediatizadas por el poder oligárquico gamonalista en la década del sesenta, luego de la crisis agraria y la descapitalización de haciendas y cooperativas agrarias, todo esto inició la etapa del derrumbe y desaparición de Chancay denominada la “década perdida”, de la más importante provincia de la costa central, intensificada por las acciones del Congreso de la República y el Poder Ejecutivo. El presente artículo constituye una reflexión sobre este significativo y atípico fenómeno socio histórico cultural, y político de la provincia de Chancay y la sobrevivencia de su legado en el Puerto de Chancay, que por su estratégica ubicación geopolítica se proyecta como una obra de perspectiva regional y mundial.
Chylous ascites in a patient with down syndrome: a case report
Authors: Edgar Alberto Jorge Chang , Acosta Cecilia Villanueva , Barquet Deneb Algedi Morales , Vaca Alfredo José Machuca , Kanan Ricardo Guillermo Guerrero , García Laura Isela Torres
Published: February 2025

Chylous ascites is the accumulation of chyle in the peritoneal cavity, it is a rare entity in the neonatal age. The causes are related to a delay in the maturation of the lymphatic capillaries at the level of the intestinal microvilli or their poor development, destruction of the lymphatic capillaries secondary to neoplasms, infections or inflammation. We present the case of a patient with a prenatal diagnosis of non-immune fetal hydrops with 46XY + 21 karyotype, diagnosed with chylous ascites on day 40 of life. The diagnostic approach, treatment and evolution in this rare entity are presented.
Health-and skill-related physical fitness in Costa Rican special operations police units
Authors: Cervantes-Sanabria Jorge , Hernández-Elizondo Jessenia , Carazo-Vargas Pedro , Siles-Canales Francisco , Brazo-Sayavera Javier , Castillo-Hernández Isaura M. , Salicetti-Fonseca Alejandro , Camacho-Sánchez Gerald
Published: February 2025

The aims of this study were: a) to provide a detailed health-and skill-related physical fitness profile of a cohort of Costa Rican Special Operations Police (SOP) units and b) to compare selected physical measures by age groups: body weight, body mass index (BMI), fat mass, body fat percentage, lean mass, resting heart rate, blood pressure, grip strength, flexibility, vertical jump height, muscular resistance, agility, anaerobic resistance and cardiorespiratory capacity were measured in SOP active members. Seventy-nine officers (age = 37.68 ± 7.86 years, height = 172.58 ± 5.35 cm, body weight = 80.49 ± 10.69 kg, BMI = 27.05 ± 3.34 kg∙m-2) participated in the study. Health-and skill-related physical fitness results of the participants were sub-optimal. Statistically significant differences were observed between age subgroups in lean mass in kg (F = 6.581, p = 0.002), A/G ratio (F = 10.078, p = 0.000), right-and left hand grip (F = 5.680, p = 0.005; F = 8.386, p = 0.001), vertical jump (SQJ , F = 8.047, p = 0.001; CMJ , F = 8.167, p = 0.001), muscular resistance (F = 4.063, p = 0.021), agility (F = 9.055, p = 0.000), anaerobic resistance (F = 7.572, p = 0.001), and cardiorespiratory capacity (F = 5.034, p = 0.009). Police officers should review their strength and conditioning programs because their fitness profile would be below general fitness standards. Age was shown to be an important factor in SOP units’ strength and conditioning performance.
Base de datos para Efecto de los programas de actividades físico y físico-recreativas en la calidad de vida de personas adultas y adultas mayores
Authors: Obando-Piedra Adriana , Jiménez-Díaz Judith , Araya-Vargas Gerardo
Published: February 2025

El objetivo del presente estudio fue identificar el tamaño de efecto (TE) de los programas de actividades físico recreativas en la calidad de vida percibida por las personas adultas y adultas mayores y analizar posibles variables moderadoras, por medio de la técnica de metaanálisis. Treinta y dos estudios cumplieron con los criterios de elegibilidad establecidos a priori. La calidad de los estudios incluidos en el metaanálisis se evaluó utilizando la escala PEDro. Bajo el modelo de efectos aleatorios se calculó el TE de la diferencia de medias estandarizadas, calculando el impacto que generan las actividades físico recreativas en la percepción de la calidad de vida de las personas participantes. Se examinó la heterogeneidad (Q de Cochran) y la inconsistencia (I2) de los datos. Se encontró que participar en actividades físico recreativas mejora la percepción en la calidad de vida (TE=0.382, p<0.001., n=224), mientras que el grupo control no mejoró la percepción de la calidad de vida (TE=0.031, p=0.285, n=116). La edad, el sexo, la condición de salud, el nivel de actividad física, ni la cantidad de sesiones del programa influye en la percepción de la calidad de vida, mientras que la duración de las sesiones si influyen en la percepción de la calidad de vida.