bluuebunny/crossref_metadata_2025 huggingface dataset:
Study the Simulation of Hybrid Solar Wind Charging Station
Authors: Ajbale Shubham
Published: July 2021

Electric vehicles play a vital role in energy saving and emission reduction of harmful greenhouse gases. electrical vehicles dispersion into the vehicles market has not been up to the mark because of less value effective and these vehicles have to be compelled to be compelled to recharge once in sixty five to seventy klick drive. The novel hybrid vehicle charging station carries with it fully totally different sources like PV systems, wind systems, the AC provide, batteries area unit used as a main energy storage system, kind DC little grid permanently energy delivery. Thus, grid offers decent quality of power to 3 totally different hundreds notably 110-volt AC single-phase output ,100 v DC output. The grid is at 230 V rms with fifty cps connected isolator in relation to the DC bus. The three-part output of the grid is regenerated to the rippled DC by utilization of DBR (Diode Bridge Rectifier). The regenerated DC voltage is fed to graphic symbol device that might be a DC-DC devices, making the rippled DC to constant DC with the use of a buck device, this paper justifies comparative performance hybrid charging station mistreatment buck and letter convertor to stabilize the DC voltage. planned system analysis in MATLAB Simulink.
Insights of Cleat Attribute of Barakar Coal Deposits of Son Valley Basin, India: Implication for Coal Bed Methane Exploration
Authors:   Centre for Petroleum Exploration, Mizoram University (A Central University), Aizawl, Mizoram, India, Kumar Susheel , Varma Atul Kumar ,   Department of Applied Geology, Indian Institute of Technology (ISM), Dhanbad, India, Mendhe Vinod Atmaram ,   CSIR - Central Institute of Mining and Fuel Research, Dhanbad, India
Published: July 2021

Cleat attributes and coal quality have been evaluated through field observation, SEM images analysis and proximate-ultimate analyses on representative coal samples collected from four different underground coal mines of Son-Valley coal Basin of central India for the characterization of coal bed methane prospective. The coal samples were characterized as durainic-clarodurainic-vitrainic type to durocalrainic-clarainic type based on litho-type composition. Cleats were identified as face cleat and butt cleat range 5-10 cm-1 to 2–3 cm-1 depending on the litho-types whereas, cleat density ranges 7-16 cm-2 revealed that cleat development is influenced by litho-types. The cleat orientation shows two main strikes almost NW-SE to NNW-SSE and NE-SW to ENE-WSW elucidates the face cleat and butt cleats are perpendicular to each other. SEM images for coal samples were analysed to validate the cleat geometry at micro-scale, illustrates that face cleat and butt cleats are orthogonal to each other. The technological properties viz. moisture (Wa), volatile matter yield (VMdaf) ash yield (Ad) of coal samples are placed in the range of 0.66–11.80, 32.0–50.05 and 13.23–43.73 wt.% respectively. The fuel ratios of all the samples varied from 1.05–2.35 indicating that coal samples were of sub-bituminous to bituminous rank. The carbon and hydrogen (Cdaf, Hdaf) content of samples ranges from 68.89–86.08 and 5.22–6.60 wt.% respectively. The atomic ratio H/C and O/C through van-Krevelen diagram demonstrate the predominance of type-III/IV kerogens usually derived from terrestrial source in studied coal belongs to the gas genesis window.
Effect of Urbanization on the Diversity of Beetle Families in and around Aizawl, Mizoram
Authors:   Department of Zoology, Mizoram University, Aizawl, Mizoram, India, Tara Malsawmdawngzuali , Murthy Meesala Krishna , Gurusubramanian Guruswami
Published: July 2021

An increase in urbanization and anthropogenic activities has led to a decrease in the area covered by forests which has an impact on the ecosystem and the diversity of flora and fauna. Coleopterans are a group of insects which are known to play an important role to study the impact of urbanization as they act as bioindicators. A study was conducted from September 2018 to October 2019 to determine the effect of urbanization and forest size on the beetle diversity in selected sites representing urban, semi-urban, and rural areas in and around Aizawl, Mizoram. Collection was done by setting up light traps as well as manual collection and other standard methods on a bi-monthly basis. A total of 445 beetles belonging to 15 families were collected. Identification of beetles was carried out only upto family level. Beetles community showed a significant variation in different degrees of urbanization as abundance and species diversity of beetles declined with increasing urbanization in different sites. In terms of the total number of individuals collected, the family Scarabaeidae was the most dominant (21.35%), followed by Cerambycidae (19.77%) and Lucanidae (11.91%) with the highest numbers collected from rural sites. The soil parameters were analyzed which showed a significant correlation with the forest size and this, in turn, affects the beetle diversity. Overall, the diversity of beetles (diversity index, richness, and abundance) is found to be affected in such a way that it is higher in rural sites as compared to urban sites.
Physico-Chemical Analysis of Selected Potable Water in Parts of Mamit District, Mizoram
Authors:   Department of Geology, Mizoram University, Aizawl, Mizoram, Ramngaihawma B , Kumar Shiva ,   Department of Geology, Mizoram University, Aizawl, Mizoram, Bharti V.K ,   Department of Chemistry, Govt. Kolasib College, Kolasib, Mizoram, tluanga Malsawm , Blick John ,   Department of Geology, Lunglei Govt. College, Lunglei, Mizoram
Published: July 2021

In the present study, physico-chemical characteristics of potable water from the selected area in the central part of Mamit district, Mizoram were analysed to obtain the quality level for domestic uses. During the non-monsoon period, the residents in the selected area mainly depend on perennial spring (Tuikhur), hand pump, and rainwater harvesting without any treatment for drinking and other domestic purposes. A total of 17 potable water samples were collected from 6 different stations in the study area. The water samples were analysed for their physico-chemical characteristics, viz. pH, Turbidity, EC, Total Dissolve Solids, Total Hardness, Total Alkalinity, chloride, fluoride, nitrate, and sulphate. On comparing the results against water quality standards and standard values recommended by the World Health Organization (WHO) and Bureau of Indian Standard (BIS), it is found that most of the water samples are well within the permissible limit and suitable for drinking and domestic purposes. Analysis of heavy metals such as Iron, Zinc, Cadmium, Magnesium, Copper, Lead, Potassium, Chromium, Manganese, Calcium, Arsenic, and Sodium was also carried out by using Microwave Plasma Atomic Emission Spectroscopy (MPAES). The concentrations of heavy metals were also found within the acceptable limits as per WHO and BIS guidelines.
Application of Machine Learning Techniques in Crop Disease Classification: A Comprehensive Review
Authors:   Department of Information Technology, North-Eastern Hill University Shillong, India, Amitab Khwairakpam , Hmingliana Lal ,   Department of Computer Engineering, Mizoram University, Mizoram, India, Nath Amitabha ,   Department of Information Technology, North-Eastern Hill University Shillong, India
Published: July 2021

Crop diseases are the main threat to agricultural products. Fast, accurate, and automatic detection of diseases can help to overcome this problem. Literature suggests, machine learning techniques are capable of achieving these goals in near real-time. This article presents a comprehensive review of machine learning techniques for crop disease detection and classification. Existing plant disease classification systems are explored and commonly used processing steps are investigated. Analysis of machine learning techniques, accuracy factor, and current state-of-the-art in this domain have been reviewed and presented through this manuscript. The survey resulted in the identification of the strengths and limitations of existing techniques and provides a road map for future research works. These would help researchers to understand and pursue machine learning applications in the field of disease detection and classification
Geochemical Appraisal on History and Evolution of Barail Sandstones of Zote-Ngur, Champhai District, Mizoram, India
Authors:   Department of Geology, Mizoram University, Aizawl, Mizoram, India 5Department of Geology, Govt Zirtiri Residential Science College, Lalnunmawia Jimmy , Hauhnar Malsawmtluangkima , MS Dawngliana Orizen , Kumar Shiva , Zoramthara C.
Published: July 2021

Mizoram is part of Surma basin which later evolved into the present state of geological terrain due to Indo- Myanmar tectonic collision during the Oligocene period. The present work deals with geochemical characteristics of Barail sandstones exposed in Champhai area of eastern region in Mizoram. The major/minor oxides, trace elements and rare earth elements data are used to infer the geological history and evolution of the sandstone in the study area of Champhai. The petrographic study shows the presence of various detrital grains like quartz, lithic fragments, feldspar, chertz, mica, etc., which are cemented by siliceous and ferruginous materials. Geochemically, the sandstones indicate high wt% of SiO2, Al2O3 and MgO compared to Upper Continental Crust (UCC) while rest of the major oxides indicate low concentrations. The geochemical classification indicated the sandstones as litharenite and wacke. The chondrite normalised REE pattern shows the enrichment of HREE and depletion of LREE with negative Eu anomaly. The value of Eu/Eu*, La/Lu, La/Co, Th/Sc, Th/Co, Cr/Th and high ratio of LREE/HREE of Barail sandstone suggest felsic source rock. The analysis of paleoweathering history indicated moderate to intensive weathering in the provenance. Various tectonic discriminant function diagrams suggested Active Continental Margin settings.
Single-copy activation of Bell nonlocality via broadcasting of quantum states
Authors: Bowles Joseph , Hirsch Flavien , Cavalcanti Daniel
Published: July 2021

Activation of Bell nonlocality refers to the phenomenon that some entangled mixed states that admit a local hidden variable model in the standard Bell scenario nevertheless reveal their nonlocal nature in more exotic measurement scenarios. We present such a scenario that involves broadcasting the local subsystems of a single-copy of a bipartite quantum state to multiple parties, and use the scenario to study the nonlocal properties of the two-qubit isotropic state:ρα=α|Φ+⟩⟨Φ+|+(1−α)14.We present two main results, considering that Nature allows for (i) the most general no-signalling correlations, and (ii) the most general quantum correlations at the level of any hidden variable theory. We show that the state does not admit a local hidden variable description for α>0.559 and α>12, in cases (i) and (ii) respectively, which in both cases provides a device-independent certification of the entanglement of the state. These bounds are significantly lower than the previously best-known bound of 0.697 for both Bell nonlocality and device-independent entanglement certification using a single copy of the state. Our results show that strong examples of non-classicality are possible with a small number of resources.
RITUAL KHANDURI BLANG: AGAMA DAN ADAT
Authors: Mugni Abdul
Published: July 2021

This article aims to see the phenomenon that occurs in rural communities amid the onslaught of electronic media in changing the way of thinking from traditional to rational, but people are not affected by a variety of media attacks, instead khanduri blang ritual activities themselves are exposed on social media such as Facebook. Sosiety communities perform rituals from generation to generation whose beliefs are based on the creator through symbolic activities whose meaning is understood and stored in deep chambers of thought, inherent as long as the union of spirits with bodies. Actualization of religious values is born through rituals.Keywords: Ritual, Religion, Culture
NEGARA UTAMA MENURUT AL-FARABI (KONSEP DAN RELEVANSINYA DALAM KEHIDUPAN BERNEGARA MASA KINI)
Authors: Mutiani Tika
Published: July 2021

This reseach to find of understand the views of Islamic political philosopher Al-Farabi on the main country (al-madinah al-fadhilah). This method used of analysis description. This result reseach  The country that is the mainstay of Medina is the State of Medina. first Al-Farabi had opinion that the main country is a country that conforms to the ideals of Islam. In Medina this is where the teachings of Islam are practiced perfectly, especially by following Islamic law both in the time of Prophet Muhammad and in the time of al-Khulafa al- Rasyidin. Second difficult to find the concept of country as exemplified by the Prophet Muhammad, the main ideal state.Keywords: Al-Farabi, State, and al-Madinah al-Fadhilah.
METODE DAKWAH ORANG TUA SUKU BANJAR MENDIDIK ANAK-ANAK PATUHI AJARAN ISLAM
Authors: Ismail Abdul Munir , Aula Rashidatul
Published: July 2021

Islamic teachings require parents to educate children by using appropriate and memorable methods. This paper examines the da'wah methods of Banjare parents to educate children so that they adhere to the teachings of Islam. The purpose of this research is to investigate the practice of Islamic values of Banjare parents in raising their children to obey the teachings of Islam perfectly. This research uses quantitative survey methods. Survey forms are distributed to 160 at Sekolah Menengah Pertama (Junior High School). Data were analyzed using the SPSS application method for Windows (Version 23). The results found that parents of Banjare tribes told their children to pray five times a day, train children to fast, read the Koran, respect parents and teachers, guard the limits of genitalia, keep halal food and non-halal food, control emotional stability, design emotional periods, front of the child, guiding the child's behaviour and having the children dress modestly. The implication of this research shows that parents from the Banjare tribe are seen teaching their children to obey God, educating children so that children are of good morality and obedient to Islamic law.Keywords: Da'wah Method, Parents, Education Child, and Obedience to Islamic Teachings.
STRATEGI KOMUNIKASI KEPEMIMPINAN DALAM MENINGKATKAN MOTIVASI KINERJA PEGAWAI PADA DINAS PERHUBUNGAN GAYO LUES
Authors: Rusnawati Rusnawati
Published: July 2021

The number of employees lacking discipline in entering, leaving work hours, lack of enthusiasm at work, not showing the level of performance at work, and several of these factors occur in the Gayo Lues Transportation Agency. This study aims to determine the Constraints faced by Leaders in Increasing Employee Motivation at the Gayo Lues Transportation Agency, to determine the leadership communication strategy in increasing employee work motivation at the Gayo Lues Transportation Service. This research is a field research (Field research). The method in this research is descriptive method, with a qualitative approach. Data were collected through methods: interviews, observation and documentation. From the results of this study, the authors found that the obstacle to the Department of Transportation was a lack of discipline, lack of facilities and infrastructure and human resource factors, the impact of this made employees appear not to show enthusiasm at work. However, the communication strategy at the Department of Transportation carried out by the leadership with its employees is good even though the communication carried out is not verbal but non-verbal, which is transferred to the Secretary and supported by applicable rules, this rule is applied to part of the strategy of the Gayo Lues Transportation Service. Namely regarding discipline at work, if there are employees who still violate these rules, they will be given sanctions ranging from mild, moderate and severe. Suggestions given by researchers to get maximum results, personal approach must be improved. Without ever differentiating employees from one another which can lead to conflict and jealousy by each employee.Keywords:  Communication Strategy, Leadership, Motivation, and Employee Performance.
A Bayesian Approach to Modal Acoustic Emission Source Location
Authors: Zárate Boris A.
Published: July 2021

Modal Acoustic Emission (MAE) is a branch of Acoustic Emission (AE) with proven capabilities for Structural Health Monitoring (SHM) of plate-like structures. MAE differences from AE in that MAE uses the understanding of the wave propagation to characterize and locate the source. The analysis of the waveform includes the use of time frequency techniques to determine the Time Of Arrival (TOA) of the different modes. This paper proposes the use of Bayesian inference to quantify the uncertainty in the source location for two different MAE location techniques. The first technique uses only the TOA of the extensional (symmetric) mode, while the second technique uses the TOA of both extensional and flexural (antisymmetric) modes. The Morlet wavelet is used to determine the scalogram of the waveform. The scalogram is reassigned and Markov Chain Monte Carlo (MCMC) is used to sample the posterior distribution built through Bayesian inference. Results are presented from location of Pencil Lead Breaks (PLBs) in an aluminum plate of 1/8in of thickness and 36in by 36in. Results show that using the TOA of only the symmetric mode leads to a lower level of uncertainty compared to using both extensional and flexural modes, because of the difficulty in assessing the time of arrival of the flexural mode.
El Método Singapur como estrategia didáctica para el fortalecimiento de la competencia de resolución de problemas aditivos en estudiantes de básica primaria
Authors: Meneses-Patiño Yeslyn Paola , Ardila Laudid
Published: July 2021

La presente  investigación titulada  “El Método Singapur como Estrategia Didáctica para el fortalecimiento de la Competencia de Resolución de Problemas Aditivos, en estudiantes de segundo y tercer grado de Básica Primaria de la Institución Educativa Colegio Luis Carlos Galán Sarmiento Cúcuta”, tuvo como objetivo fortalecer la competencia  de resolución de problemas aditivos en estudiantes de los grados segundo y tercero de primaria de la Institución Educativa Colegio Luis Carlos Galán Sarmiento a través de la implementación de una estrategia didáctica basada en el método Singapur. La investigación es de tipo cualitativo debido a que produce datos descriptivos (las propias palabras de las personas, habladas o escritas, y la conducta observable, adicional), se utilizó el diseño de la investigación-acción la cual permite analizar y describir las acciones humanas y las situaciones sociales experimentadas por sus integrantes, tales como problemáticas susceptibles de cambio y aquellas que requieran una respuesta práctica.  Para su planteamiento se partió de una revisión bibliográfica, que dio luces al sustento teórico del problema y su posible solución, así como para la implementación de aspectos metodológicos, diseño de instrumentos como el test inicial, el diario pedagógico, la entrevista a otros docentes, estrategias didácticas como referentes para el diseño de las propias y el test final.  Paso seguido, se procedió al desarrollo de las estrategias didácticas que generaron aprendizajes significativos en los estudiantes, específicamente en el tema de resolución de problemas aditivos. El impacto en el grupo de estudio fue satisfactorio por cuanto permitió un avance importante en la construcción de conocimiento, capacidad de debatir y argumentar propuestas de solución a los diferentes problemas aditivos planteados en las actividades de clase
Errores y dificultades en la resolución de problemas algebraicos
Authors: Sánchez-García Zulma consuelo
Published: July 2021

El estudio se desarrolló para determinar los errores y las dificultades que presentan los estudiantes del grado once de la Institución Educativa Misael Pastrana Borrero de Cúcuta al enfrentarse a la solución de problemas algebraicos. Se aplicó un diseño descriptivo con dos instrumentos. Los resultados permitieron detectar que, de los 12 errores que se tomaron como dimensiones de estudio, siguiendo a García (2010), se replican ocho, siendo el más significativo el error de cálculo simple. Se puede concluir que los errores que se evidencian, muy bien podrían ser producto de sus experiencias de aprendizaje que han tenido en sus estudios previos. Con respecto a las dificultades, la de mayor aparición fue la relacionada con los procesos de enseñanza.
Crea, Innova, comunica y emprende. Competencias básicas a desarrollar en cálculo en programas de pregrado
Authors: Vergel-Ortega Mawency , Gómez-Vergel Carlos Sebastián , Villamizar-Laguado Dilmar
Published: July 2021

La investigación tiene por objeto el identificar competencias básicas a desarrollar en el marco de oferta de programas de pregrado en la juventud.  Sigue un enfoque cualitativo descriptivo de tipo documental. Resultados permiten observar que el pensamiento matemático, lógico, variacional son requeridos dentro de los objetivos de aprendizaje. Se concluye que la creatividad, la innovación, comunicación y el emprendimiento son competencias a desarrollar en los programas.
Development of logical-mathematical thinking in first graders by using ict
Authors: Sanabría-Pérez Jesús Hernando , Villamizar-Mendoza María Eugenia
Published: July 2021

Nowdays the implementation of teaching strategies, incorporating the most well-known Information and Communication Technologies such as ICT in the teaching-learning process have increased in different areas of knowledge, and mathematics is not exception, it allows the strengthening of logical-mathematical thinking in students and it is essential to start from the first grade of the basic primary. Taking in account that ICTs are now part of the daily lives of most of students, it was concluded that by taking advantage of the interest that students have in ICTs today, no matter their age, this interest can be channeled to strengthen logical-mathematical thinking from an early age, as ICTs allow the teaching-learning process to be more enjoyable and participatory, also the process can continue, outside the classroom.
Methodological strategy for the teaching of the pythagorean theorem in the eighth grade of the institution monseñor Jaime Prieto Amaya
Authors: Gómez-Sánchez Henyi Maryan , Vergel-Ortega Mawency , Rojas-Suárez Jhan Piero
Published: July 2021

This experimental quantitative research with a descriptive approach, which was developed in a period of time of one year with the participation of the teacher of the mathematics area and a total of 100 students who were in grade 8, arose due to the difficulties that the students presented. students in the application of the Pythagorean theorem in everyday life.

Due to this, the need arose to propose methodological strategies for the contextualization of the teaching of the Pythagorean Theorem and in this way, achieve a better understanding regarding this concept; For this reason, it was investigated with the students from a pre - test of prior knowledge which allowed to show the rhythms and styles of learning.

After this search for information, it was possible to corroborate that the students felt more comfortable when classes were held outside the classroom; In this way, the activities were more experiential and significant, which made it possible to relate the Pythagorean theorem in a transversal way with areas such as physical education, in terms of the identification of the right triangle in different spaces of the court, measurements and distances; on the other hand, in relation to the artistic area in the formation of triangles the rectangles from origami and the way to find their measurements for the creation of these figures.

 The construction of this knowledge could be verified through the application of a post test which resulted in an improvement in the understanding of the practical use of the Pythagorean theorem in different contexts.
Formación inicial docente en México: hacia una caracterización del conocimiento matemático inclusivo
Authors: López-Mojica José Marcos , Hernández-Sánchez Judith Alejandra , Aké-Tec Lilia Patricia , Ordaz-Arjona María Guadalupe
Published: July 2021

La formación del profesorado es un elemento relevante en la capacidad formativa de los estudiantes para hacer frente a los desafíos que demanda la sociedad actual y también para atender la educación de los estudiantes en condiciones de vulnerabilidad. Si hablamos de la educación matemática de estudiantes con discapacidad, el desafío educativo es amplio. Por ello, se reflexiona sobre la presencia de la inclusión en la formación de profesores de matemáticas en México; esto a través de investigaciones que los autores han realizado sobre los planes de estudio que los forman. También, de manera más general, se expone la necesidad de caracterizar el conocimiento matemático inclusivo; discutiendo antes una posible interpretación de la noción de inclusión en la educación matemática. Las reflexiones generadas de esta revisión apuntan a que la presencia de la inclusión en las carreras que forman a los futuros profesores de matemáticas en México es incipiente. Además de la necesidad de establecer una categoría de análisis para el conocimiento matemático inclusivo; aquí se presenta un primer acercamiento a su estructura. Ésta comprende tareas para el desarrollo del pensamiento matemático basado en la diversidad en el aula y alternativas de enseñanza que reconozcan e identifiquen los procesos cognitivos de los niños con discapacidad. Consideramos que profundizar en esta categoría podría incidir en los planes de estudios encargados en formar a los futuros profesores de matemáticas teniendo en cuenta las nuevas políticas de la educación inclusiva en el mundo; esto coadyuvará en la diversificación de los procesos de enseñanza, promoviendo un aula de matemáticas inclusiva.
Descripción de los problemas sociales influyentes en la transición moral en una sociedad cambiante a través del enfoque cuantitativo
Authors: Contreras-Manrique Rocío de Belén , Contreras-Manrique Liliana , Ovalle-Lizcano Tatiana Valentina , Espinosa-Bohórquez Luz Marina , Valero-Bencardino Juvenal , Coronel-Peñuela Diego Luis , Cabrera-Reyes Alfonso
Published: July 2021

Describe los problemas sociales influyentes en la transición moral en una sociedad cambiante. Metodología/Enfoque.  Cuantitativa,  muestra 100 universitario. Resultados/Hallazgos. Las normas jurídicas sinónimo del derecho, han tenido diversas transiciones por medio de la historia; relevante recordar que el derecho y la moral deben ir en conjunto, no puede coexistir la una sin la otra ya que son estrechamente dependientes, porque la moral va a establecer lo que es correcto, el deber ser de determinadas conductas y es una interioridad constante, evolutiva, acorde a las condiciones.  Discusión/Conclusiones/Contribuciones. El derecho ha tenido cambios históricos a través del tiempo, es inconcebible no pensar que el mismo llegue a una mutación por falta de condiciones en el futuro. Las diversas crisis por las que constantemente ha tratado de sobrevivir el planeta tales como la sobrepoblación, las pandemias que reducen la durabilidad, que inducirán al derecho a dar una vuelta y acoplarse a la civilización, llegará el tiempo, que el deber del estado ya no será asegurar la vida sino la supervivencia; en el caso del aborto, podría esta carencia de condiciones cambiar la opinión colectiva respecto a este tema de controversia mundial y pasar de ser una aberración a una solución eficaz para reducir la población, en  consecuencia a un control de integrantes en la familia y la aprobación de la eutanasia como recurso que justifique una muerte digna, dejando lo ético y predomina lo conveniente; siendo la moral y el derecho piezas moldeables a las necesidades de la sociedad.
Dificultades alrededor de tareas algebraicas, ¿Existen diferencias de genero?
Authors: Duran-Lamus Josué , Hernández-Suárez Cesar Augusto , Prada-Núñez Raúl
Published: July 2021

Este artículo es un avance de los resultados derivados de una investigación que pretende determinar las debilidades y fortalezas que exhiben los estudiantes de décimo grado de una institución educativa de carácter privado al momento de resolver problemas algebraicos. Se adopta un enfoque cuantitativo a nivel descriptivo de corte transversal. Se selecciona una muestra no probabilística de tamaño 40 estudiantes, con edad promedio de 15 años a los que se les aplica un cuestionario compuesto por 15 ítems en dónde se proponen situaciones cotidianas o de interés general en las que se articulan diversos registros semióticos de representación. A nivel general, se encontró un nivel de desacierto de 54% de los casos. En cuanto a las fortalezas, se resalta que al menos tres de cada cuatro estudiantes pueden articular correctamente entre enunciados de situaciones cotidianas con su respectivo registro gráfico en dos dimensiones dónde se relaciona las variables Tiempo vs otra variable como Velocidad, Temperatura o Longitud. Finalmente, se evidenciaron dificultades en situaciones asociadas con la aplicación de la descomposición factorial en la solución de ecuaciones y en el establecimiento de relaciones de orden entre cantidades expresadas en diversas unidades de medida.
Intervención pedagógica tendiente a desarrollar el pensamiento variacional en estudiantes de educación básica primaria
Authors: Contreras-Jaimes Karen Yuletzi , Martínez-Aguilar Jessica Paola , Prada-Núñez Raúl
Published: July 2021

El presente artículo destaca la importancia que tiene el desarrollo del pensamiento variacional desde la educación básica primaria, para lo cual la investigación se orienta en identificar problemas para su enseñanza que permitan establecer una estrategia didáctica y novedosa que atiende al contexto y no compartimenta los pensamientos matemáticos. Cuyo objeto es determinar el efecto de algunas intervenciones pedagógicas tendientes a desarrollar dicho pensamiento en estudiantes de quinto primaria, cuyo enfoque es cuantitativo con un nivel descriptivo. Para esto, se realizó un análisis de la praxis del docente, se aplicó un test cuyos resultados permitieron la preparación de una serie de intervenciones pedagógicas en conjunto con el desarrollo de un proyecto transversal, posteriormente se aplicó nuevamente el test para determinar el impacto de las intervenciones pedagógicas. En los resultados se evidenció que algunos niños lograron llegar a la abstracción y modelación algebraica de problemas, para dar solución mediante el planteamiento y posterior resolución de ecuaciones y así mismo basarse en el empleo de tablas y gráficas para la compresión de dichos problemas, permitiendo comprobar que el pensamiento variacional se puede desarrollar desde los primeros años escolares; concluyendo así que relacionar su entorno e incluir el uso de material concreto en el proceso de enseñanza-aprendizaje les permite comprender con facilidad la aplicabilidad del conocimiento adquirido.
Uso del análisis multivariado factorial mixto para caracterizar variables climáticas y edáficas en sistemas agropecuarios colombianos
Authors: Castillo Vargas Julián Andrés , Cuervo Vivas Wilmer Alfonso
Published: July 2021

Contextualización: La productividad de los sistemas agropecuarios se define como la combinación de las variables climáticas y edáficas que los caracteriza. Por tanto, el entendimiento de la interrelación de tales variables debe ser estudiado bajo un abordaje multivariado.

 Vacío del conocimiento: Hasta ahora, no han sido desarrollados estudios que determinen la estructura multivariada de variables asociadas a climatología y edafología de los sistemas agropecuarios en Colombia.

Propósito: determinar la estructura multivariada de variables climáticas y edáficas en los sistemas agropecuarios colombianos usando la técnica de análisis multivariado factorial mixto (AMFM).

Metodología: Se construyó una base de datos con 167 registros de variables climáticas (altitud, temperatura y humedad relativa) y edáficas (textura del suelo, pH, actividad enzimática de la ureasa y actividad enzimática de la catalasa) de predios destinados a la producción agrícola o pecuaria primaria en 21 departamentos y 120 municipios de Colombia. La estructura de las variables anteriormente mencionadas fue analizada usando un AMFM utilizando el software Statistica, versión 7.0, siendo estas clasificadas en factores latentes. Una variable era asociada a un factor latente, cuando el valor absoluto de su correlación con el factor era mayor que 0.5.

 

Resultados y conclusiones: Usando el AMFM, se extrajeron cuatro factores latentes para las siete variables estudiadas, los cuales representaron un 75% de la varianza total. El primer factor se asoció positivamente con la altitud (0,950) y negativamente con la temperatura (-0,957), siendo denominado como “Climático”. El segundo factor se correlacionó negativamente con la humedad relativa (-0,790) y la actividad ureasa (-0,706). Adicionalmente, este tuvo una asociación negativa secundaria con el pH (-0,343), siendo denominado como “Ureasa-agua-pH”. El tercer factor fue denominado como “Fisicoquímica-suelo” y se correlacionó positiva y fuertemente con la textura del suelo (0,917). Variables como la humedad relativa (-0,281), pH (0,306) y actividad ureasa (0,211), también tuvieron una contribución secundaria a este factor. El cuarto factor se correlacionó positivamente con el pH (0,544) y la actividad catalasa (0,887), siendo denominado como “Catalasa-pH”. Del presente estudio se puede concluir que el AMFM reveló la estructura multivariada de variables climáticas y edáficas asociadas a los sistemas de producción agropecuaria colombiana.
Sex-dependent differential transcript expression in the placenta of growth restricted infants
Authors: O'Callaghan Jessica , Clifton Vicki , Prentis Peter , Ewing Adam , Saif Zarqa , Pelzer Elise
Published: July 2021

Objective: To characterise placental gene expression at term to evaluate
sex-specific genetic changes that occur in small for gestational age
(SGA) infants. Design: Case control study. Setting: Australian
hospitals. Samples: Twelve human placental samples from pregnancies that
were either SGA or appropriate for gestational age (AGA). Methods:
RNA-sequencing of term placental tissue from both SGA and AGA infants.
Candidate genes associated with fetal size and fetal sex were identified
using differential gene expression and weighted gene co-expression
network analyses. Single-cell sequencing data was used for candidate
validation and to estimate candidate transcript expression in specific
placental cell populations. Main outcome measures: Functions of
differentially expressed genes in the placenta of SGA infants that
differed by fetal sex. Results: Differential gene expression and
weighted gene co-expression network analyses identified 403 candidate
transcripts associated with SGA infants. One hundred and three of these
transcripts showed sex-specific expression. Sex-independent transcript
expression for genes involved in protein synthesis, and sex-dependent
transcript expression for genes involved in cell cycle processes in
males and endoplasmic reticulum stress in females was validated (17 and
7 transcripts for females and males) in published placental
RNA-sequencing datasets. Conclusions: Sexual dimorphism is an important
consideration when examining placental dysfunction and poor fetal
growth. This study identified activation of shared and divergent
molecular mechanisms (i.e., cell cycle and endoplasmic reticulum
stress), in response to an adverse environmental stressor.
METHOD OF GENERALIZED FUNCTIONS IN PLANE BOUNDARY VALUE PROBLEMS OF UNCOUPLED THERMOELASTODYNAMICS
Authors: Dadayeva Assiyat , Alexeyeva Lyudmila
Published: July 2021

Nonstationary boundary value problems of uncoupled thermoelasticity are
considered. A method of boundary integral equations in the initial
space-time has been developed for solving boundary value problems of
thermoelasticity by plane deformation. According to generalized
functions method the generalized solutions of boundary value problems
are constructed and their regular integral representations are obtained.
These solutions allow, using known boundary values and initial
conditions (displacements, temperature, stresses and heat flux), to
determine the thermally stressed state of the medium under the influence
of various forces and thermal loads. Resolving singular boundary
integral equations are constructed to determine the unknown boundary
functions.
PD-L1 TESTING AND IMMUNOTHERAPY SELECTION – EARLY LABORATORY EXPERIENCE AND ITS POTENTIAL ROLE IN HEAD AND NECK CANCER MANAGEMENT
Authors: Bancu Bancu , Cowan Richard , Chaturvedi Anshuman
Published: July 2021

Anti-programmed cell death protein-1 (PD-1) therapy has been relatively recently approved in a defined context by NICE in adults in the management of recurrent and metastatic head and neck squamous cell carcinomas (HNSCC). In this context, companion diagnostic programmed cell death ligand-1 (PD-L1) testing, previously established at our center for lung and bladder tumors, was undertaken in a few head and neck cancer cases. The scope of this study was to audit the relevant PD-L1 data and integrate the findings in our current clinical practice, with a view to promote improved routine laboratory biomarkers in HNSCC. Histopathology reports documenting tumor type, PD-L1 result and type of clone/assay were included in this study. Over a 5-year period, PD-L1 testing was undertaken in 199 cancer cases, including 3 with head and neck squamous carcinoma with low focal positive staining. Immunotherapy treatment in HNSCC demonstrates a discreet but still significant improvement in the overall survival of PD-L1 positive subjects.
Building an Automated win-win Negotiation Process Model
Authors: Ghalayini Latifa , Deeb Dana
Published: July 2021

This paper builds an automated negotiation process model for integrative negotiations. The process model defines and automates the necessary phases and activities along with the integrative negotiation approach principles to create win-win outcomes that mutually satisfy negotiating parties. However, to realize this objective, the negotiation literature and theories are reviewed to determine the relevant theories for integrative negotiations that help to develop and form the basis of the process model. After investigation, it became evident that three main theories, which are Decision Theory, Rational Choice Theory and Mutual Gains Theory, contribute to building the integrative process model by setting its phases and components. The model is composed of five main phases with several sub-phases. Decision theory with mutual gains theory provides the robust process model through several phases, and rational choice theory with mutual gains theory ensures they are implemented in a fair, objective manner to come up with a satisfying win-win solution. Hence, automated negotiation processes when designed in a robust manner that is based on the theory that serves integrative approaches could lead to win-win negotiation outcomes. The foundation of the win-win negotiation process model contributes to designing win-win negotiation outcomes through structuring automated negotiation and setting its phases along with the integrative negotiation principles. It develops the negotiation field by integrating automation and the integrative approach principles in a process model.
Morphometric characterization of Pirot pramenka
Authors: Ruzic-Muslic Dragana , Petrovic Milan , Cekic Bogdan , Cosic Ivan , Pavlovic Ivan , Maksimovic Nevena , Caro-Petrovic Violeta
Published: July 2021

The strategy of conservation of endangered sheep populations implies
morphological and genetic characterization, as basic preconditions for their
conservation. The aim of this study was to determine the morphometric
characteristics, their correlations and the index of physical development of
Pirot pramenka, which has the status of the most endangered population in
Serbia. The measuring was performed on 30 sheep, aged 3 years, reared in the
area of Stara Planina. The descriptive statistical procedure was performed
using the statistical package Statistica (version 8). The average height at
the withers was 56.31 cm, body length 62.93 cm, chest width 18.37 cm, chest
depth 25.96 cm, chest circumference 77.59 cm, shin circumference 6.70 cm.
The strongest and significantly positive correlation (P <0.05) was found
between chest depth and height at withers (0.65), body length (0.58) and
body weight (0.56). Pirotska pramenka has slightly higher indices of format,
chest and massiveness, in relation to breeds Vitoroga Zuja and Travnik
Pramenka. These morphometric traits suggest that, compared to previous
research, the body frame of Pirot pramenka sheep did not change
significantly, which means that there were no crosses with other breeds due
to geographical isolation and enthusiasm of breeders to preserve the
indigenous Pirot pramenka which was the starting point for following
authentic brands: Pirot lamb, cheese and carpet. Hence the biological and
moral imperative: to preserve this highly endangered population.
The SARS-COV-2 pandemic and the challenges of intellectual property rights
Authors: Lukinovic Mario , Vitosevic Zdravko
Published: July 2021

The COVID-19 virus pandemic had a drastic impact on the social lives of billions of people, hitting certain industries like a hurricane. What the answer will be to this and possible other occurrences of pandemics in the future will largely depend on the inventiveness of the researchers. Intellectual property is the first system to offer answers, opening patent bases to anyone developing new technologies to fight the COVID-19 pandemic. The need for the means of prevention, treatment, and care has caused thousands of different researches, which find inspiration and guidance for discovering new solutions in patents that already exist. Publication of scientific papers has never been so intense in any scientific field as in medicine since the fight against this virus began. The time since the beginning of the virus pandemic has shown that science and innovators are ready for such challenges, but the global health crisis has imposed a new challenge on the intellectual property system, which refers to the strict implementation of its rights at times when rapid and global effect is needed in order to avoid additional deterioration due to further circulation of the virus among the population, which inevitably leads to the emergence of new strains of the virus.
Advanced calculators and advanced-level mathematics
Authors: Ruthven Kenneth
Published: July 2021

In July 1988, six small groups of teachers, from Bury, Essex, East Sussex, Leicestershire, Northamptonshire and Suffolk, met together to launch the Graphic Calculators in Mathematics project, sponsored by the National Council for Educational Technology. Each group was locally coordinated by an adviser or advisory teacher, while I was on 0.2 secondment to act as national coordinator of the project. Over the following two years, the project teachers worked with classes of students who had permanent access to graphic calculators throughout their advanced-level mathematics courses. Rather than following any prescribed programme of calculator activities, the teachers were free to plan the work of their classes within the normal syllabus constraints, meeting together from time to time to exchange ideas and review progress. In this article, I want to draw on experience from this project to discuss two major issues that new technology raises for advanced-level mathematics.
Pre-implantation Screening and Diagnosis
Authors: O’Brien Kaylin
Published: July 2021

Through cellular biopsy of a developing embryo, genetic testing can be performed as part of the embryo selection phase of an in vitro fertilization (IVF) cycle. Preimplantation genetic screening (PGS) and preimplantation genetic diagnosis (PGD) allow embryos to be tested for genetic conditions on a chromosome and gene level, respectively, prior to implantation in the uterus and prior to pregnancy. Included in this review are indications for PGS and PGD, the biopsy and diagnostic methods that are most frequently utilized, advances in recent non-invasive technologies, and potential impacts that PGS/PGD and IVF may have on developing embryos.
This review contains 5 figures, 1 table, and 53 references. 
Keywords: Preimplantation genetic diagnosis, preimplantation genetic screening, blastocyst biopsy, blastomere biopsy, advances in PGS/PGD, indications for PGS/PGD, non-invasive embryo biopsy, infertility
Prohibitin Inactivation in Adipocytes Results in Reduced Lipid Metabolism and Adaptive Thermogenesis Impairment
Authors: Gao Zhanguo , Daquinag Alexes C. , Fussell Cale , Djehal Amel , Désaubry Laurent , Kolonin Mikhail G.
Published: July 2021

Prohibitin-1
(PHB) is a multifunctional protein previously reported to be important for
adipocyte function. PHB is expressed on the surface of adipose cells, where it
interacts with a long
chain fatty
acid (LCFA) transporter.
Here, we show that mice lacking PHB in adipocytes (PHB Ad-KO) have a defect in fat tissue
accumulation despite having larger lipid droplets in adipocytes due to reduced lipolysis. Although PHB Ad-KO mice do not display glucose
intolerance, they are insulin resistant. We show that PHB Ad-KO mice are lipid intolerant due
to a decreased capacity of adipocytes for LCFA uptake. Instead, PHB Ad-KO mice have increased expression
of glucose transporter GLUT1 in various tissues and use glucose as a preferred
energy source. We demonstrate that PHB Ad-KO mice have defective brown AT, are
cold-intolerant, and display a reduced basal energy expenditure. Systemic
repercussions of PHB inactivation in adipocytes were observed in both males and
females. Consistent with lower cellular mitochondrial content and reduced UCP1
protein expression, brown adipocytes
lacking PHB display decreased proton leak and switch from aerobic metabolism to
glycolysis. Treatment of differentiating brown adipocytes
with small molecules targeting PHB suppressed mitochondrial respiration and uncoupling. Our results demonstrate that
PHB in adipocytes is essential for normal fatty acid uptake, oxidative
metabolism, and adaptive thermogenesis. We conclude that PHB inhibition could
be investigated as an approach to altering energy substrate utilization.
Price Analysis, Marketing Communication, and Brand on Costumer Loyalty
Authors: Pratiwi Cyndy Melliani , Purba Purnama Yanti , Han's James , Tanadi Stevent
Published: July 2021

This study aims to test and analyze the influence of the test and analyze the influence of Price, Marketing Communication and Brand Loyalty of the Customers. The phenomenon of decrease in number of subscribers, the price of which is not optimal, marketing communication has not been satisfactory and brands that are less well interesting background of this research. The research method is quantitative approach, type of research is descriptive and quantitative nature of this research is descriptive explanatory. The population was 144 customers from January to December 2019. The sample in this study was 106 customers. The sampling technique used is simple random sampling. Testing the validity and reliability of 30 consumers taken from the rest of the population that is not used in the sample. The data was collected using questionnaires distributed to consumers as respondents, interviews were conducted with consumers, and documentation studies. Methods of data analysis is multiple linear regression analysis. The test results obtained the calculated F value (25.019) > F table (2.69) and the significance probability was 0.000 <0.05. The results of the calculation of partial hypothesis testing obtained tcount > ttable or 2,581 > 1,983 and significant obtained 0.011 < 0.05. So, it can be concluded that price analysis, marketing and brand communication has positive and significant effect on customer loyalty.