bluuebunny/crossref_metadata_2025 huggingface dataset:
EL IMPACTO DEL ENTORNO MACROECONÓMICO EN EL DESARROLLO DE LA MIPYME: EL CASO DE MÉXICO
Authors: Saavedra García María Luisa , Saavedra García Miriam Edith
Published: October 2021

RESUMEN:

El objetivo de este trabajo consiste en determinar de
qué manera el entornomacroeconómico, enmarcado
bajo el concepto del nivel macro de competitividad
sistémica, influye en el desarrollo de la MiPyME en
México.
Este trabajo se desarrolló en tres partes; la primera,
se conceptualiza y describen los indicadores del nivel
macro de competitividad, así también se da cuenta de
las investigaciones antecedentes que han intentado
establecer una relación entre las variables del entorno
y la competitividad de las empresas; la segunda, se
realiza la descripción del entornomacroeconómico de
la MiPyME en México, mostrando la evolución de las
variablesmás importantes que afectan al desempeño
empresarial; por último, se presenta un análisis FODA
en el que se determina con respecto al entorno
macroeconómico de quemanera este, afecta o beneficia
al desarrollo de la MiPyME.

ABSTRACT:

The aim of this study is to determine how the
macroeconomic environment, framed under theconcept
of systemic competitiveness at the macro level,
influences the development of the SME inMexico.
This work took place in three parts the first is
conceptualized and described themacro-level indicators
of competitiveness, and realizes that background
investigations have attempted to establish a relationship
between environmental variables and competitiveness
of enterprises. In the second part, it is described in the
macroeconomic environment of the SME in Mexico,
showing the evolution of themost important variables
affecting business performance. Finally, we present a
SWOT analysis that is determined with respect to the
macroeconomic environment in which way this affects
or benefits the development of SMEs.
LAS NUEVAS TECNOLOGÍAS EN LA LEGISLACIÓN TRIBUTARIA MEXICANA. ESPECIAL REFERENCIA AL MODELO DE GESTIÓN TRIBUTARIO
Authors: Pons Franco Enrique
Published: October 2021

El objeto del presente documento, como su nombre lo indica, tiene como finalidad realizar una crítica, a guisa de ensayo, breve, y seguramente insuficiente por los amplios contenidos que incluye, sobre la incorporación de las nuevas tecnologías en la legislación gestión tributaria mexicana, especialmente referida al Código Fiscal de la Federación, la cual, como daremos cuenta, incluye la remisión de información contable de los contribuyentes por medios electrónicos. La principal hipótesis de nuestro trabajo se basa en descubrir: ¿De qué manera se integraron al ordenamiento jurídico tributario las nuevas tecnología, particularmente, la relativa a los medios electrónicos; ¿Realizó realmente el legislador un trabajo parlamentario agudo, o simplemente, la incorporación de los medios electrónicos pasó sin mayor debate en su proceso de aprobación?; y por último, verificar si la incorporación de medios electrónicos en el sistema jurídico que regula la gestión del tributo en México reúne los requisitos de carácter constitucional. Todas éstas hipótesis, claro está, en lo que hace al fenómeno de la gestión tributaria, concepto el cual, también nos ocupamos de definir al menos de manera orientadora. Asimismo, como suele acontecer en todas las investigaciones de tipo jurídico, cabe señalar que esta será de tipo documental y dogmático, teniendo especial referencia, en los criterios emitidos por la Suprema Corte de Justicia de la Nación.
DESARROLLO DE SISTEMA WEB PARA VENTA DE LIBROS POR INTERNET EN LA BIBLIOTECA "ING. CÉSAR O. PALACIO TAPIA DE LA UJAT". USANDO LAS REDES SOCIALES
Authors: Ronzón Contreras José Jaime
Published: October 2021

RESUMEN

La Biblioteca «Ing. César O. Palacio Tapia» de la
Universidad Juárez Autónoma de Tabasco, no
cuenta con un Sistema Web para la venta de
libros, como un servicio más que permita a los
usuarios comprar por Internet. Surgió un proyecto
para vender libros en línea, mediante un Sistema
Web, acatando necesidades de estudiantes,
maestros y público en general. El objetivo de este
proyecto es enfocarse al comercio electrónico,
dado que es un medio conocido mundialmente
por los usuarios. La elaboración de este trabajo
se realizó con la herramienta WYSIWYG Web
Builder. Este servicio funciona mediante una
conexión que inicia desde la Biblioteca Campus
Cunduacán «Ing. César O. Palacio Tapia», hacia
la Librería Universitaria de la UJAT, ubicada en
Villahermosa, Tabasco. Al sistema se podrá
acceder desde cualquier terminal, a disposición
del comprador. El punto de venta es la Biblioteca
Campus Cunduacán. Este proyecto favorece a
alumnos, profesores y público en general que
dedican su tiempo libre a la lectura.

ABSTRACT

The Library «Ing. Cesar o. Palacio Tapia « from
«Universidad Juarez Autonoma de Tabasco»,
does not have a Web System for selling books
as a service that allows users to shop online. It
emerged a project to sell books online, through a
Web System, accepting needs of students,
teachers and the general public. The objective of
this project is to focus on electronic commerce,
since it is a means known worldwide for users.
The development of this work was done with the
WYSIWYG Web Builder tool. This service works
by initiating a connection from the Campus Library
Cunduacán «»Ing. Cesar o. Palacio Tapia «from
«Universidad Juarez Autonoma de Tabasco» to
the University Bookstore UJAT, located in
Villahermosa, Tabasco. System can be accessed
from any terminal, to the buyer. The selling point
is the Cunduacán Campus Library. This project
encourages students, teachers and the general
public who devote their free time to reading.
ANÁLISIS CUALITATIVO DE LA PERCEPCIÓN DEL MARKETING COMO FACTOR COMPETITIVO INTERNO: CASO DE UNA MICROEMPRESA FERRETERA DE YUCATÁN
Authors: López Arroyo María De los Ángeles , Morales González María Antonia , Madero Llanes Jorge Emeterio , Hernández Barajas Luis Miguel
Published: October 2021

Objetivo: Conocer la percepción de una microempresa del subsector ferretero de Mérida, Yucatán en cuanto a cómo aplica las herramientas operativas del marketing (producto, precio, plaza y promoción).

Material y método: La investigación fue de enfoque cualitativo, la información se obtuvo mediante entrevistas estructuradas. Los resultados se basan en un análisis de contenido de nivel sintáctico realizado en el software Nvivo 10.0.

Resultados: En la herramienta enfocada al producto las percepciones evidenciaron la ausencia de una metodología para determinar los productos que se comercializan, de igual forma en las herramientas enfocadas al precio y plaza se observó la ausencia de una metodología para la fijación de precios y la ubicación de la empresa respectivamente y finalmente herramienta publicidad, se observó divergencia en su objetivo principal el cual recae en la promoción de los productos o servicios y no en posicionar el nombre de la empresa como fue el caso de la presente investigación.

Conclusiones: La microempresa estudiada realiza las actividades que implican las herramientas operativas del marketing, sin embargo, se observó que las herramientas producto, precio y plaza se desarrollan empíricamente.
CLIMA ORGANIZACIONAL E INNOVACIÓN SEGÚN LA CLASIFICACIÓN DE LOS HOTELES. UN ESTUDIO EN EL SURESTE DE MÉXICO
Authors: Patrón Cortés Roger Manuel , Barroso Tanoira Francisco Gerardo , Santos Valencia Raúl Alberto
Published: October 2021

Objetivos: Son: (1) Determinar el grado de apertura del clima organizacional en los hoteles participantes; (2) Verificar si existe diferencia significativa entre dicho grado según el tipo de hotel, y (3) Identificar la relación entre el grado de apertura del clima organizacional y la innovación, desde la percepción de los trabajadores de los hoteles.

Material y método: Este estudio comienza como exploratorio y evoluciona a descriptivo, con enfoque cuantitativo (Hernández, Fernández & Baptista, 2014). El diseño es no experimental transversal. Se utilizó la encuesta como técnica y el cuestionario como instrumento. Se invitó, como participantes, a dos hoteles de la ciudad de San Francisco de Campeche, uno de cuatro y otro de cinco estrellas.

Resultados: El clima organizacional no depende de la clasificación ni del tamaño del hotel, sino del liderazgo que favorezca un clima de tipo abierto, capaz de fomentar la innovación y, por consiguiente, la adaptación al cambio, por lo que urge a esas empresas preparar a sus directivos y gerentes para ello. Se continuará con este estudio en otros hoteles de diferentes clasificaciones y tamaños en la región para verificar patrones de formación de líderes que favorezcan el clima organizacional necesario para innovar.

Conclusiones: El clima organizacional está en el liderazgo y en factores culturales, no en el tamaño o tipo del hotel. El grado de apertura del clima organizacional en los hoteles participantes, mostró una tendencia hacia uno cerrado o semi-cerrado, el cual no favorece la innovación.
LA ACREDITACIÓN DE LOS PROGRAMAS EDUCATIVOS EN LAS UNIVERSIDADES PÚBLICAS
Authors: Priego Hernández Oscar , De la Rosa Leal María Eugenia , Ramírez Martínez Miguel Ángel
Published: October 2021

Objetivo: Identificar los nuevos roles que deben jugar los docentes y los alumnos en el proceso de la acreditación de los programas educativos de licenciatura en las áreas económico administrativas.

Material y método: El método de estudio que se propone es analítico y descriptivo basado en la experiencia y aplicación de entrevistas personales a profesores, alumnos y personal administrativo. La metodología utilizada es de enfoque cualitativa.

Resultados: Los resultados que se presentan son preliminares en virtud de que la investigación está en proceso y muestran que los profesores y alumnos en las áreas económico administrativas no están debidamente informados de la verdadera filosofía del significado de un programa de estudio acreditado.

Conclusiones: Las universidades que han logrado la acreditación de sus programas educativos deben diseñar estrategias para difundir los resultados entre sus profesores y alumnos así como evaluar las ventajas de los nuevos roles y compromiso en el proceso de acreditación.
EVENTOS GASTRONÓMICOS EN MÉXICO Y TURISMO
Authors: Mejía Rocha Mónica Isabel
Published: October 2021

La historia culinaria mexicana es opulenta a través de la cual se puede apreciar desde la historia prehispánica, así como el mestizaje con otras culturas. La gastronomía como tal alude a la cultura, esencia y espíritu de los pueblos. La cultura prehispánica como tal, sienta sus bases en cuatro elementos principales: el maíz, el chile, el frijol y el cacao. El presente trabajo permite mostrar al lector el inventario de los diferentes eventos gastronómicos que se desarrollan en la República Mexicana a fin de promover la cultura y fortalecer los productos turísticos que ofrecen los destinos nacionales. Dentro de los principales resultados se pudo conocer que existe una variedad significativa en cuanto a las ferias, festivales y encuentros gastronómicos en el país. Estos eventos no siempre aluden a insumos endémicos de la región donde se promueven; sin embargo, si todos se presumen benefician al desarrollo de la actividad turística.
INNOVACIÓN E INFRAESTRUCTURA EN MÉXICO
Authors: Sánchez Trujillo Magda Gabriela , García Vargas María de Lourdes , Rodríguez Lugo Ventura
Published: October 2021

OBJETIVO: Realizar una aproximación al estudio de la infraestructura de información comunicación y tecnología, sistemas de innovación y capacidad emprendedora en las entidades que integran la región Sur del Estado de Hidalgo.

MATERIAL Y MÉTODO: Se realizó una adaptación a la metodología del Banco Mundial que integra las características fundamentales para calcular la economía del conocimiento: infraestructura tecnológica en materia de comunicación que permita la transferencia de conocimiento entre los sectores, el capital humano.

RESULTADOS: El alcance de la infraestructura tecnológica, así como la provisión de acceso a internet, la disponibilidad de equipos telefónicos y de cómputo en la población, continúa siendo limitada y heterogénea en su distribución, por lo que es posible inferir la limitada interconexión y el acceso a oportunidades de intercambio conocimiento e información, no solo al interior del país, sino también con el exterior.

CONCLUSIONES: Los hallazgos pueden ser de utilidad y tener implicaciones importantes para el desarrollo de políticas empresariales de tal forma que permita a las autoridades gubernamentales plantear estrategias para incrementar la cobertura en infraestructura de información, fortalecer la capacidad emprendedora e incidir en generar mayor innovación a nivel nacional.
FACTORES DE ÉXITO PARA LA CREACIÓN DE HOSPEDAJES EN ZONAS DE RIESGO VOLCÁNICO
Authors: Santamaría Freire Edwin , Sánchez Ocaña Nataly Belén , Moncayo Robinson Adela
Published: October 2021

OBJETIVO: Determinar los factores de éxito de hospedajes en zonas de riesgos volcánico.

MATERIAL Y MÉTODO: Se ha recurrido a la investigación descriptiva, con la aplicación de encuesta validada a 129 turistas que acuden a hospedajes en zonas de riesgo volcánico.

RESULTADOS: Muestran que los turistas encuentran como atractivo seleccionar un hospedaje ubicado en lugares de riesgo de los cuales un porcentaje elevado consideran que el riesgo en general es un atrayente por encontrarse con la cercanía de la fuerza de la naturaleza, además, se ve como una experiencia diferente por la descarga de adrenalina. La investigación establece el análisis sistemático de las ventajas y otras implicaciones que se generan al implementar un emprendimiento turístico en zonas de riesgo especialmente volcánico.

CONCLUSIONES: El riesgo volcánico es un atractivo para el turista que busca aventura y experiencias únicas que incentivan a la creación de nuevos hospedajes turísticos en zonas de riesgo.
MARKETING DE UNIVERSIDADES, ¿OFERTA EDUCATIVA O IMAGEN?
Authors: Acosta Ruiz Karen Giselle , Camacho Gómez Manuela , Zapata Cortes Julio Alejandro
Published: October 2021

OBJETIVO: Conocer la percepción que se tiene sobre el marketing en las universidades y su relevancia en la imagen institucional.

MATERIAL Y MÉTODO: La investigación se realizó con el método cualitativo fenomenológico, utilizando la técnica de sondeo flash, donde los informantes fueron estudiantes de pregrado de dos universidades: una pública y una privada.

RESULTADOS: Los principales resultados muestran una tendencia de los jóvenes para elegir instituciones con una imagen institucional reconocida socialmente, oferta de servicios educativos diferenciados, calidad y prestigio.

CONCLUSIONES: La percepción que los alumnos tienen de marketing universitario y de imagen institucional de sus universidades (pública y privada), lo confirman con el producto; es decir, con la oferta de servicios educativos y la calidad educativa que les ofrecen; además valoran la existencia de los planes estratégicos y el prestigio que estas han obtenido a lo largo del tiempo.
Para los estudiantes de la universidad privada, la imagen institucional se basa en la responsabilidad social universitaria y la oferta de servicios educativos, mientras que para los estudiantes de la universidad pública, la refieren como prestigio y reconocimiento social y destacan la calidad educativa de su institución.
EMPRENDIMIENTO INNOVADOR: EL CASO DE LOS EMPRESARIOS DE SOFTWARE EN YUCATÁN
Authors: Flores Novelo Anel , Bojórquez Carrillo Ana Laura
Published: October 2021

OBJETIVO: Evaluar el efecto del capital humano emprendedor y la innovación en el desempeño de la organización.

MATERIAL Y MÉTODO: El estudio fue transversal, con alcance correlacional. Fue elaborado bajo el método mixto, mediante un diseño embebido (embedded or nested design). El diseño mixto embebido, implica que en el diseño de recolección de datos cuantitativos hay insertar técnicas de recolección de datos cualitativas (Creswell y Plano, 2007).

RESULTADOS: Las empresas de software yucatecas muestran resultados positivos en actividades de innovación y muestran que la innovación es una variable con un aporte positivo al desempeño de las empresas de software en el contexto de Yucatán.

CONCLUSIONES: Este trabajo aporta evidencia que robustece el papel de la innovación en el desempeño de los negocios. Analiza los factores que propician el desarrollo de estas innovaciones como son los antecedentes familiares, la formación profesional.
Destaca la importancia de los emprendimientos proactivos y el papel de este tipo de motivación para lograr que negocios innovadores de corte tecnológico como el software, generen buenos resultados en un ecosistema emprendedor poco favorable, como el de Yucatán.
LA GASTRONOMÍA COLOMBIANA. ATRACTIVO TURÍSTICO EN CRECIMIENTO
Authors: Naranjo Arango Rodrigo , Naranjo Africano Gloria , Leones Viana Ader Ricardo
Published: October 2021

OBJETIVO: Demostrar que la gastronomía colombiana se ha convertido en un atractivo para el turismo, con un potencial de crecimiento y desarrollo.

MATERIAL Y MÉTODO: Tipo descriptivo y se apoyó en revisión de un material bastante amplio como fuentes secundarias, que permitieran construir una caracterización con base en la literatura de como la gastronomía constituye un atractivo turístico en la actualidad.

RESULTADOS: Se pudieron evidenciar datos significativos con relación a los platos más representativos de cada región, del mismo modo se encontraron hallazgos como cifras muy dicientes acerca de cómo ha avanzado el sector gastronómico dentro del país y las potencialidades que éste tiene.

CONCLUSIONES: La gastronomía del país es uno de los grandes pilares de la economía pues las cifras y los resultados obtenidos hablan por sí solos, y que de ser potencializado se estarían generando resultados extraordinarios no solo a nivel de crecimiento sino de desarrollo económico.
ÍNDICE DE ESPECIALIZACIÓN PUNTO BASE Y COEFICIENTE DE ESPECIALIZACIÓN: ANÁLISIS COMPARATIVO Y ESTADÍSTICO
Authors: Gutiérrez Lagunes Mario , Romo Orozco José Manuel , Quintana Estrada Aderak
Published: October 2021

OBJETIVO: Presentar la metodología del índice de especialización punto base (IEPB), que puede ser utilizada para establecer tendencias de actividades productivas con suficiente precisión, para ser comparado con el coeficiente de especialización (CE), reportado por la literatura especializada.

MATERIAL Y MÉTODO: La presente investigación es de tipo descriptivo, explicativo y estadístico; descriptivo debido a que se identifican las principales características de ambos índices al ser usados con datos del sector manufacturero mexicano, comparativo ya que se encuentran características y diferencias que presentan cada uno, y estadístico porque al realizarse una prueba de hipótesis de muestras apareadas se identifica similitud entre ambos índices.

RESULTADOS: Al aplicarse el IEPB y CE a los diferentes subsectores del sector manufacturero mexicano para establecer tendencias se pudieron observar comportamientos similares; a partir de la prueba estadística realizada, ambas metodologías arrojan resultados similares.

CONCLUSIÓN: El análisis demuestra que ambos índices, el IEPB y CE, son estadísticamente indistintos. Además existe una relación de complementariedad, sobre todo cuando son usados en análisis sectoriales, ya que el primero se ve reforzado y ampliado cuando se recurre al segundo índice.
PARTICIPACIÓN CIUDADANA Y RESPONSABILIDAD SOCIAL PARA EL DESARROLLO SUSTENTABLE
Authors: Amador Angón Liliana , Sarquís Ramírez Jorge Isaac , Juárez Rivera Omar
Published: October 2021

Este ensayo, presenta una serie de argumentos que pretenden contribuir a la construcción teórica de la participación ciudadana, responsable como objeto de estudio en relación a la sustentabilidad del desarrollo. Sostenemos que la responsabilidad ciudadana individual es requisito sine qua non para poder exigir responsabilidad social empresarial; asimismo sostenemos que el poder político representativo ha agotado sus posibilidades de orientar del mejor modo el tema económico y por ello se ha agotado también su credibilidad. Juntas, responsabilidad ciudadana y responsabilidad social de las empresas conforman la única base sólida sobre la que se puede lograr una injerencia de la sociedad sobre la construcción de políticas públicas que atiendas al bien común; rompan con el paradigma desarrollista y con la rancia componenda cupular que sigue definiendo el interés general a espaldas de la sociedad. Se describe la aportación que desde la esfera organizacional ha permeado hasta la sociedad y sus estructuras para potenciar el cambio necesario en la ética del ciudadano de a pie que dé viabilidad a la economía ecológica. Por último, se ejemplifica el tipo de organización civil que puede coadyuvar al tránsito social local hacia estos fines con la descripción de la incipiente experiencia del Observatorio Urbano de Orizaba.
Conhecendo as diferentes faces do ozônio
Authors: Yamamoto Ana Letícia Campos , Reboita Michelle Simões , Corrêa Marcelo de Paula
Published: October 2021

O ozônio (O3) é um gás presente em duas camadas da atmosfera terrestre: na troposfera (altura 0-15 km), camada que contém 75% do volume total de gases presentes na atmosfera, e na estratosfera, camada que se estende entre 15 e 50 km de altitude. O processo de formação do O3 em cada uma dessas camadas é diferente, bem como os impactos na saúde humana: enquanto o O3 troposférico é deletério à saúde, o estratosférico tem um efeito indireto benéfico. A fim de contribuir para a disseminação do conhecimento sobre o O3, aqui é descrito, por meio de uma revisão atualizada da literatura, o processo de formação do O3 em cada camada atmosférica, seu impacto na saúde humana e, também, os fatores que causam a depleção da camada de ozônio.
Alternative Für Deutschland Strategy in 2017 Germany Legislative Election: Analysis of Posters as Visual Campaign Media
Authors: Priyanto Nafila Maulina
Published: October 2021

Paham Populisme-Ekstrem Sayap Kanan mengalami kenaikan di Eropa utamanya pascakrisis pengungsi 2014-2015. Krisis ini menjadi momentum bagi partai populis ekstrem sayap kanan untuk memobilisasi suara masyarakat. Di Jerman, partai Alternative für Deutschland (AfD) mendapat dukungan yang masif ketika partai memutuskan untuk berfokus pada ideologi dan kritiknya mengenai krisis pengungsi Eropa pada pemilihan legislatif tahun 2017. Salah satu cara strategi yang digunakan oleh partai adalah dengan kampanye melalui poster. Oleh karena itu, untuk menjawab pertanyaan bagaimana karakter populis ekstrem sayap kanan direpresentasikan dalam poster kampanye partai AfD, penelitian ini menggunakan konsep Populisme Sayap Kanan dan teori Strategic Political Communication yang dianalisis dengan menggunakan metode CDA untuk dapat menganalisis poster secara spesifik. Penelitian ini menyimpulkan bahwa partai AfD lebih menunjukkan karakter rasis pada poster-poster kampanyenya yang ditunjukkan oleh atribut-atribut budaya yang digunakan. Kata-kata kunci: Populisme-ekstrem sayap kanan; Alternative Für Deutschland; Krisis Pengungsi Eropa Right-wing populism-extreme views have increased in Europe, especially after the 2014-2015 refugee crisis. This crisis has become a momentum for extreme right-wing populist parties to mobilize people’s voices. In Germany, the Alternative für Deutschland (AfD) party received massive support when it decided to focus on its ideology and criticism of the European refugee crisis in the 2017 legislative elections. One of the strategies used by the party was through poster campaigns. Therefore, to answer how the extreme right-wing populist character is represented in the AfD party’s campaign poster, this study uses the concept of Right-wing Populism and the theory of Strategic Political Communication, which is analyzed using the CDA method be able to analyze the poster specifically. This study concludes that the AfD party shows more of a racist character on its campaign posters which is indicated by the cultural attributes used. Keywords: Alternative für Deutschland, Right-wing extremism, Refugee Crisis
EXAMINING THE RELATIONSHIPS BETWEEN FEMALE FRONTLINE EMPLOYEES’ AESTHETIC LABOUR AND BURNOUT
Authors: Katircioglu Esra , Akgun Tekin Omer
Published: October 2021

Purpose –The objective of the study is to reveal the relationships between aesthetic labour performance of female employees and their burnout level. Additionally, their aesthetic labour performance is to be compared in terms of their demographic characteristics and personal characteristics. Design – To test the proposed hypotheses, a correlational research design was used and a causalcomparative design was adopted to compare the aesthetic performance of frontline employees in terms of their demographic and personal characteristics. Methodology- Quantitative research methods were used in this study. Findings – The results showed that there was a significant, weak, and negative relationship between aesthetic labour performance in guest interactions factor and employee burnout levels. Additionally, there were significant differences in female frontline employees’ aesthetic labour performance in terms of their demographic and personal characteristics as education, tourism educational background, monthly average income and departments. Originality of the Research – Aesthetic labour is an important concept for the hospitality industry. Yet, there are few studies designed to figure out the aesthetic labour levels of employees in hospitality enterprises. Furthermore, there are limited studies focusing on the relationship between aesthetic labour and burnout. This study aims to fill a gap in the literature by developing a scale to assess female frontline employees’ aesthetic labour performance and providing large-scale survey data.
Evaluation of the speed of the plant photosynthesis process with a fuzzy description of impact factors and indicators
Authors: Pashchenko Ruslan , Mariushko Maksym
Published: October 2021

The subject of the study is evaluation of the speed (intensity) of the crop photosynthesis process with a fuzzy description of external impact factors and special indicators. The object of the study is to determine the speed (intensity) of the plant photosynthesis process at a given time with known impact factors and indicators of the photosynthesis process, obtained using remote sensing data. The goal of this work is to consider the possibility of applying fuzzy set theory to problem solving of evaluation the speed of the plant photosynthesis. As a result of the study, a fuzzy description of impact factors and indicators of the plant photosynthesis process was introduced. Based on this description, a method was developed to decide on the nature (speed) of the photosynthesis process taking into account NDVI and fractal dimension. The results of determining the speed of the plant photosynthesis process with three different values sets of impact factors and indicators of the photosynthesis process are presented. Conclusions. It is shown which fuzzy values of factors and indicators impact the evaluation of the speed of the plant photosynthesis process.
Small-scale Automated Drip Circulation System
Authors: Obeng Okofo Dartey Yaw , Boamah Osei Antwi Eno , Munagah Bassit Maryam , Ayaw Oduro-Koranteng Elizabeth
Published: October 2021

Hunger and Poverty are one of the major problems faced in Sub-Saharan Africa. To get rid of this problem in line with the aim of the sustainable development goals, there is the need to increase current production levels of food. This can be achieved by mechanizing farming systems and introducing technology to farming systems. This paper seeks to introduce an automation system that uses automated drip irrigation with a circulation system to efficiently use energy and avoid the amount of water wasted during farming activities to attempt to increase food production levels..
Localization of Optic Disc in Normal and Pathological Retinal Images
Authors: Khare Vijay
Published: October 2021

In this paper a new method for optic disc (OD) detection in retinal images has been proposed. It is based on computing the OD location using dictionary based approach. The idea behind the approach is that OD properties within the retinal images remain consistent (i.e. brightness, circular shape and blood vessel convergence at the OD center) and thus OD region can be linearly represented in terms of dictionary elements composed using similar patterns selected from subimage in the training phase. The robustness of OD center detected is ensured by verifying the presence of main blood converges at OD center in its neighbourhood. These main blood vessels are obtained by estimating the background information using large window sized median filter. Also for reducing the average computation time, we have performed OD detection in test image only on bright pixels and assumed pixel intensity as primary component for OD detection. These bright pixels are selected by local thresholding (i.e. 15*15 block) in the test retinal image using Otsu algorithm. The result of proposed method has been obtained on DRIVE, STARE, and DIARETDB1 datasets includes 210 retinal images with success rate of 100%, 95.06% and 98.8%.
Development and Performance Evaluation of TaqMan Real-time Fluorescence Quantitative Methylation Specific PCR for Detecting Methylation Level of PER2
Authors: Jiang Huihui , Yang Xin , Mi Miaomiao , Wei Xiaonan , Wu Hongyuan , Xin Yu , Jiao Liping , Sun Shengjun , Sun Chengming
Published: October 2021

Background: PER2 gene methylation is closely related to the occurrence and progress of some cancers, but there is no method to quantitatively detect PER2 methylation in conventional laboratories. So, we established a TaqMan real-time fluorescence quantitative methylation specific PCR (TaqMan real-time FQ-MSP) assay and use it for quantitative detection of PER2 methylation in leukemia patients. Methods: According to the PER2 sequence searched by GenBank, a CpG sequence enrichment region of the PER2 gene promoter was selected, and the methylated and unmethylated target sequences were designed according to the law of bisulfite conversion of DNA to construct PER2 methylation positive and negative reference materials. Specific primers and probe were designed. The reference materials were continuously diluted into gradient samples by 10-fold ratio to evaluate the analytical sensitivity, specificity,accuracy and reproducibility of the method, and the analytical sensitivity of TaqMan real-time FQ-MSP assay was compared with that of the conventional MSP assay. At the same time, the new-established TaqMan real-time FQ-MSP assay and the conventional MSP assay were used to detect the PER2 methylation level of 81 patients with leukemia, and the samples with inconsistent detection results of the two assays were sent to pyromethylation sequencing to evaluate the clinical detection performance .Results: The minimum detection limit of TaqMan real-time FQ-MSP assay for detecting PER2 methylation level established in this study was 6 copies/uL, and the coefficient of variation(CV) of intra-assay and inter-assay was less than 3%. Compared with the conventional MSP assay, it has higher analytical sensitivity. For the samples with inconsistent detection results, the results of pyrosequencing and TaqMan real-time FQ-MSP assay are consistent. Conclusion: TaqMan real-time FQ-MSP assay of PER2 methylation established in this study has high detection performance and can be used for the detection of clinical samples.
The Asymmetric Effect of Environmental Policy Stringency On CO2 emissions in OECD Countries
Authors: Albulescu Claudiu Tiberiu , BOATCA-BARABAS Maria-Elena , DIACONESCU Andra
Published: October 2021

This paper uses a quantile fixed-effect panel data approach to investigate how environmental policy stringency affects CO2 emissions in a set of 32 OECD countries from 1990 to 2015. This approach allows us to identify the asymmetric impact of policy stringency on emissions, considering the emission level recorded in each analysed country. More precisely, we posit that the effectiveness of environmental regulations and policies is influenced by the air pollution level. Our results show that an increase in policy stringency has a negative impact on emissions. As a new contribution, we show that environmental stringency has a more powerful impact in the countries with lower level of carbon emissions. This result is also recorded for the subset of EU member countries of the OECD. Moreover, we show that policy stringency measures only become effective after the implementation of the Kyoto agreement. Finally, the policy stringency effect is stronger for EU countries at high risk of missing the 20-20-20 target in terms of greenhouse gas emissions.JEL codes: Q43, Q56, F21
Efficacy of Intrauterine Insemination in Women with Endometrioma-Associated Subfertility: Analysis Using Propensity Score Matching
Authors: Xie Jinlin , Cai He , Shi Juanzi , Wang Hui
Published: October 2021

Background: Intrauterine insemination (IUI) treatment is recommended in subfertile women with AFS/ASRM stage I/II endometriosis. However, the efficacy of IUI in women with ovarian endometriomas with tubal patency is uncertain. We explored the efficacy of IUI for the treatment of endometrioma-associated subfertility.Methods: We performed a retrospective matched cohort study using propensity matching (PSM) analysis. Subfertile couples undergoing IUI with and without ovarian stimulation between January 1, 2015, and May 30, 2020 were reviewed.Results: After PSM, 56 women with endometrioma alone were matched to 173 patients with unexplained subfertility. The per-cycle pregnancy rate (PR) was comparable between women with endometrioma-associated subfertility (n=56, 87 cycles) and women with unexplained subfertility (n=173, 280 cycles) (9.2% vs. 17.9%, OR 0.47; 95% CI, 0.21–1.03). Subgroup analyses based on IUI with or without stimulation also resulted in comparable results. A trend toward a lower cumulative pregnancy rates (CPRs) was seen in women with endometrioma (14.3%, 8/56) compared with women with unexplained subfertility (28.9%, 50/173), but the differences were not significant (OR, 0.54; 95% CI, 0.26-1.15). However, patients with endometrioma were nearly twice as likely to converse to IVF treatment compared with those without the disease (60.7% versus 43.9%; OR, 1.97; 95% CI, 1.07-3.65).Conclusion: IUI may be a viable approach for subfertile women with endometrioma and no other identifiable infertility factor. More studies are needed to reassure the findings.
Investigation on the application of by-product steam in iron ore sintering: performance and function mechanism
Authors: Wu Yufeng , Fan Xiaohui , Ji Zhiyun , Gan Min , Zhou Haoyu , Li Haorui , Chen Xuling , Zhao Yuanjie , Zhang Rongchang , Lai Ruisi
Published: October 2021

The combustion-supporting effect of steam to coke breeze in sintering has the potential to improve sinter quality and reduce pollutants emissions. The results show that increasing the by-product steam injection concentration(0.32-0.47vol%) and prolonging the injection time(5min) within a proper range(10-15min) can improve sinter quality. 2.13kgce/t−sinter of the fuel consumption was decreased by reducing coke breeze usage from 5.60–5.45% under the recommended parameters, with 15.16% decrease of CO in sintering waste gas. By comparing experimental data with thermodynamic calculations, although the reaction between CO and steam can reduce CO emission and generate H2, steam tends to react with coke breeze to generate H2 and CO(react at 674℃), and OH radical produced by H2 which can reduce the activation energy of CO oxidation reaction is the key to reducing pollutant emissions. The application of steam injection technology, excluding the equipment modification and steam injection cost of $300,000, can achieve a profit of $737491.2 per year. Therefore, low-carbon and cleaner iron ore sintering production can be realized through applying by-product steam.
Novel Ca2+-modulated Photoactivatable Imaging Reveals Neuron-Astrocyte Glutamatergic Circuitries within the Nucleus Accumbens
Authors: Serra Irene , Esparza Julio , Delgado Laura , Martin Cristina , Puigròs Margalida , Podlesniy Petar , Trullas Ramon , Navarrete Marta
Published: October 2021

Astrocytes are key elements of brain circuits that are involved in different aspects of the neuronal physiology relevant to brain functions. Although much effort is being made to understand how the biology of astrocytes affects brain circuits, astrocytic network heterogeneity and plasticity is still poorly defined. Here, we have combined structural and functional imaging of astrocyte activity using the Ca2+-modulated photoactivatable ratiometric integrator and specific optostimulation of glutamatergic pathways to map the functional neuron-astrocyte circuitries in the nucleus accumbens (NAc). We showed pathway-specific astrocytic responses induced by selective optostimulation of main inputs from the prefrontal cortex, basolateral amygdala, and ventral hippocampus. Furthermore, the differences in basal Ca2+ dynamics between the NAc shell and core astrocytes were associated with differences in mitochondrial DNA copy number, exhibiting molecular heterogeneity in the regulation of their mitochondrial genomes. Finally, co-stimulation of glutamatergic pathways induced non-linear Ca2+-signaling integration, revealing integrative properties of NAc astrocytes. All these results demonstrate the existence of specific neuron-astrocyte circuits in the NAc, a critical insight to the understanding of how the NAc integrates information.
Identification and Validation of Prognosis-Associated DNA Repair Gene Signatures in Colorectal Cancer
Authors: Song Dingli , Zhang Dai , Chen Sisi , Wu Jie , Hao Qian , Zhao Lili , Ren Hong , Du Ning
Published: October 2021

Colorectal cancer (CRC) is the third most common malignant tumor. DNA damage played a crucial role on tumorigenesis, and abnormal DNA repair pathways affected the occurrence and progress of CRC. In current study, we aimed to construct a DNA repair-related genes (DRG) signature to predict the overall survival (OS) of CRC patients. Differentially expressed DRGs (DE-DRGs) were analyzed using The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) databases. The prognostic gene signature was identified by univariate Cox regression and Least Absolute Shrinkage and Selection Operator (LASSO)-penalized Cox proportional hazards regression analysis. The predictive ability of the model was evaluated by utilizing Kaplan-Meier curves and Time-dependent receiver operating characteristic (ROC) curves. Gene set enrichment analysis (GSEA) was performed to explore the underlying biological processes and signaling pathways. Single sample gene set enrichment analysis (ssGSEA) was implemented to estimate the immune status between the different risk group. A total of 118 DE-DRGs were identified between 42 normal samples and 488 CRC samples in TCGA cohort, and 36 DE-DRGs were associated with OS in the univariate Cox regression. A 9 DE-DRGs (ESCO2, AXIN2, PLK1, CDC25C, IGF1, TREX2, ALKBH2, ESR1 and MC1R) signature was constructed to classify patients into high-risk and low-risk group. The risk score was an independent prognostic indicator for OS (HR>1, P<0.001). Genetic alterations analysis indicated that the 9 DE-DRGs in the signature were changed in 63 required samples (100%) and the major alteration was missense mutation. The function enrichment analysis indicated that RNAi effector complex, sensory perception of smell and olfactory receptor activity were the main biological processes. The high-risk group had higher immune cell infiltration levels than low-risk group. The 9 DE-DRGs signature was significantly associated with OS and provided a new insight for the diagnosis and treatment for CRC. The predictive ability of this model need be supported by further basic researches.
Observation of anyonic Bloch oscillations
Authors: Zhang Weixuan , Yuan Hao , Wang Haiteng , Di Fengxiao , Sun Na , Zheng Xingen , Sun Houjun , Zhang Xiangdong
Published: October 2021

Bloch oscillations are exotic phenomena describing the periodic motion of a wave packet subjected to the external force in a lattice, where the system possessing single- or multiple-particles could exhibit distinct oscillation behaviors. In particular, it has been pointed out that quantum statistics could dramatically affected the Bloch oscillation even in the absence of particle interactions, where the oscillation frequency of two pseudofermions with the anyonic statistical angle being π becomes half of that for two bosons. However, these statistic-dependent Bloch oscillations have never been observed in experiments up to now. Here, we report the first experimental simulation of anyonic Bloch oscillations using electric circuits. By mapping eigenstates of two anyons to modes of designed circuit simulators, the Bloch oscillation of two bosons and two pseudofermions are verified by measuring the voltage dynamics. It is found that the oscillation period in the two-boson simulator is almost twice of that in the two-pseudofermion simulator, which is consistent with the theoretical prediction. Our proposal provides a flexible platform to investigate and visualize many interesting phenomena related to particle statistics, and could have potential applications in the field of the novelty signal control.
High-temperature thermal decomposition of iso-octane based on reactive molecular dynamics simulations
Authors: Guan Yulei , Gao Yanyan , Lou Junpeng , Zhu Xingzhen , Pan Dandan , Ma Haixia
Published: October 2021

The branched alkanes are the major components of endothermic fuels used for advanced aircrafts. Reactive molecular dynamics (RMD) simulations are carried out to explore the detailed kinetic mechanism for the thermal decomposition of iso-octane widely used as the primary reference fuel of branched alkanes. The RMD calculations indicate that the initial decomposition mechanism of iso-octane is mainly through two pathways: (1) the C−C bond cleavage to produce smaller hydrocarbon radicals and (2) the hydrogen-abstraction reactions by small radicals including •H and •CH3. Most of the alkenes which are associated with the endothermic capacities in the iso-octane pyrolysis are produced from the C–C β-scission reactions of alkyl radicals. Propylene and ethylene are observed to be formed in large amounts. Kinetic parameters with the activation energy of 52.12 kcal mol–1 and pre-exponential factor of 7.21 × 1014 s–1, based on the first-order kinetic analysis, are in good agreement with previous work.
Analysis of the Glucose-Dependent Transcriptome in Murine Hypothalamic Cells
Authors: Webert Leonhard , Faro Dennis , Zeitlmayr Sarah , Gudermann Thomas , Breit Andreas
Published: October 2021

We have previously shown that glucose activates CREB-regulated transcriptional co-activator-2 (CRTC-2) in murine, hypothalamic (mHypoA-2/10) cells. Thus, we now analysed the entire glucose-dependent transcriptome of mHypoA-2/10 cells by total RNA-seq. 831 genes were up- and 1390 genes down-regulated by at least 50 %. Signalling pathway analysis revealed activation of the cholesterol biosynthesis pathway by glucose. Accordingly, protein expression of both sterol regulatory element-binding proteins (SREBP) and total cholesterol levels were enhanced by glucose. Analysis of single genes involved in fundamental signalling processes suggested a significant impact of glucose. Thus, we chose ~100 genes and validated the effects of glucose on mRNA levels by qRT-PCR. We identified 15 genes with strong glucose-dependent mRNA expression. Among these genes were gnai1 to -3, adyc6, irs1, igfr1, hras and elk3. cAMP measurements revealed decreased basal and enhanced noradrenalin-induced cAMP levels at higher glucose concentrations. Serum-response element-dependent reporter assays indicated enhanced basal and insulin-like growth factor-induced activity at higher glucose levels. siRNA against CRTC-2 dampened the effects of glucose on cholesterol synthesis and IRS-1, SREBP-1, SREBP-2 or AC-6 protein expression. These findings could help to understand the functional consequences of physiologically occurring alterations of extracellular glucose concentrations as well as pathologically increased glucose levels.
Highly efficient and reusable energy-absorbing metamaterials exploiting soft rate-dependent frictional interfaces
Authors: Li Jinyou , Chen Zhe , Li Qunyang , Jin Lihua , Zhao Zhihua
Published: October 2021

Energy-absorbing materials with both high absorption efficiency and good reusability are ideal candidates of impact protection products. Despite the prosperous needs, the current designs are either efficient but one-time-use, or reusable but low capacity. Here, we show that metamaterials with unprecedentedly high energy-absorbing efficiency and good reusability can be designed, reaching an energy-absorbing capacity of >2000 kJ/kg per lifetime. The extraordinary performance is achieved by exploiting rate-dependent frictional dissipation between soft elastomer and hard constituents in a porous structure. Particularly, the compliant elastomer in the metamaterials ensures a large real contact area, while the stiff porous supporting frame offers high and robust compressive pre-stress for the sliding interfaces, both of which are essential for vast frictional dissipation. Owing to the rate-dependent friction of elastomer interface, the metamaterials also exhibit a self-adapting feature such that more energy can be absorbed when subjected to higher impact rates. We believe this design opens an avenue to develop high-performance reusable energy-absorbing metamaterials that enable completely novel designs of machines or structures.
Modifiable Factors Associated with Reversion from Mild Cognitive Impairment to Cognitively Normal Status: A Prospective Cohort Study
Authors: Sha Feng , Zhao Ziyi , Wei Chang , Yang Zhirong , Li Bingyu
Published: October 2021

Background
Previous studies found that about 24% of the mild cognitive impairment (MCI) patients reverse to cognitively normal (CN) status. However, it is unclear which modifiable factors are associated with this reversion.
Method
We conducted a prospective community-based cohort study based on 2002-2018 Chinese Longitudinal Health Longevity Survey (CLHLS). Of 35,474 older adults from 22 provinces in China in the 5 waves of CLHLS, 7,422 eligible participants with MCI were included. Multivariable Cox regression with least absolute shrinkage and selection operator (LASSO) penalty for variable selection was adopted to investigate the associations between reversion to CN and potential modifiable dietary/lifestyle, cardiometabolic, and psychological factors.
Results
Our analysis included 7,422 MCI participants [average age: 90.0 (SD 9.5) years]. Among these participants, 1,604 (21.6%) reversed from MCI to CN with a mean (SD) follow-up of 2.9 (1.8) years. Several dietary/lifestyle factors, including daily consumption of fresh fruits (Hazard Ratio [HR]: 1.28, 95% CI: 1.15 to 1.42; P༜.001), engagement in reading (HR: 1.24, 95% CI: 1.00 to 1.54; P =.047), housework (HR: 1.21, 95% CI: 1.08 to 1.35; P =.001), and mah-jong or other card games (HR: 1.23, 95% CI: 1.08 to 1.39; P =.001), were positively associated with possibility of reversion. Cigarette smoking (HR: 0.92, 95% CI: 0.84 to 1.00; P= .041) and duration of alcohol drinking (HR: 0.97, 95% CI: 0.94 to 0.99; P = .012) were negatively associated with possibility of reversion. None of the modifiable cardiometabolic and psychological factors was found to be significantly associated with reversion to CN. Difference was identified among different age and gender group.
Conclusion
This study identified several dietary/lifestyle factors associated with MCI reversion that may transfer into large-scale dementia prevention practices.