Noraima E. Rangel Sánchez, Leobardo Pedro Plata Perez, Pedro I. González Ramírez
{"title":"Optimización dinámica aplicada al acuífero de San Luis Potosí","authors":"Noraima E. Rangel Sánchez, Leobardo Pedro Plata Perez, Pedro I. González Ramírez","doi":"10.29105/ensayos41.2-2","DOIUrl":"https://doi.org/10.29105/ensayos41.2-2","url":null,"abstract":"Este trabajo usa teoría de control óptimo para determinar el nivel de extracción de agua, de un acuífero, de manera racional. La función objetivo evalúa el valor presente del beneficio social neto de la explotación a lo largo del tiempo. En el beneficio intervienen la demanda y los costos de suministrar agua. La restricción representa la dinámica de la cantidad de agua en el acuífero, dependiendo de los niveles extracción y recarga. El modelo se aplica al acuífero 2411 de San Luis Potosí utilizando información empírica del consumo de agua de la población perteneciente a la zona conurbada de la capital del estado. La condición inicial se deja como parámetro para analizar la posibilidad tanto de óptimo interior como de óptimo de esquina. El óptimo interior recomienda un nivel de extracción de 42,854 miles de metros cúbicos y un precio de 0.00003658 pesos por metro cúbico de agua. El acuífero se encuentra actualmente muy sobreexplotado. Para mantener la sustentabilidad del acuífero se recomienda revisar la normativa de las tarifas y mejorar la micro medición de los consumos para construir un modelo más preciso.\u0000Abstract\u0000Optimal control theory is used to determine the level of water extraction, from an aquifer, in a rational way. The exploitation of the aquifer generates a net social benefit that represents the objective function. The benefit involves the demand and the costs of supplying water. The restriction represents the dynamics of the amount of water in the aquifer, depending on the levels of extraction and recharge. The model is calibrated with data on the 2411 aquifer of San Luis Potosi. Empirical information on water consumption of the population belonging to the metropolitan area of the state capital. The initial condition is left as a parameter in order to study the possibility of both an interior solution or a corner solution. The optimum interior recommends an extraction level of 42.854 thousand cubic meters and a price of 0.00003658 pesos per cubic meter of water. The aquifer is currently highly overexploited. To maintain the sustainability of the aquifer, it is recommended to review the tariff regulations and improve the micro measurement of consumption to build a more accurate model.","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48346857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Francisco Javier Ayvar Campos, Orquidia Elizet Andrea Sosa León
{"title":"Eficiencia de los programas educativos en Colombia, 2007-2018","authors":"Francisco Javier Ayvar Campos, Orquidia Elizet Andrea Sosa León","doi":"10.29105/ensayos41.2-1","DOIUrl":"https://doi.org/10.29105/ensayos41.2-1","url":null,"abstract":"La presente investigación analiza la eficiencia de 24 departamentos colombianos en el uso de sus recursos para cumplir con los objetivos de los programas educativos del país, durante el período 2007-2018. La valoración de la eficiencia se llevó a cabo mediante el Análisis de la Envolvente de Datos, diseñando tres modelos orientados al output y estructurados con rendimientos variables a escala. Los resultados de los modelos muestran que únicamente los departamentos de Bogotá D.C., Antioquia y Quindío emplearon de manera eficiente su personal docente y sedes educativas para incrementar el alfabetismo, la matriculación, y la equidad urbano-rural; por ello, es recomendable el establecimiento de políticas públicas orientadas a fortalecer el sector educativo, y con estas contribuir al bienestar de la sociedad.\u0000Abstract\u0000This research analyzes the efficiency of 24 departments of Colombia in the use of their resources to achieve the objective of the national educational programs, during the 2007-2018 period. The efficiency assessment was carried out through the Data Envelope Analysis (DEA), designing three models oriented to output and structured with variable returns to scale. The results of the three shows that only the departments of Bogota D.C., Antioquia, and Quindio efficiently used their teaching staff and educational facilities to increase literacy, enrollment, and urban-rural equity. Therefore, it is advisable to develop public policies aimed at strengthening the education sector, and thus contribute to the well-being of society.","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47423180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Pobreza infantil y su efecto en la deserción escolar (2002 -2018)","authors":"Eduardo Luis Lechuga Rodríguez","doi":"10.29105/ensayos41.1-4","DOIUrl":"https://doi.org/10.29105/ensayos41.1-4","url":null,"abstract":"La pobreza ha sido blanco de innumerables investigaciones. No obstante, este artículo tiene como objetivo conocer el efecto de este fenómeno sobre la deserción escolar, desde una perspectiva longitudinal utilizando modelos de supervivencia, en el periodo comprendido entre 2002 y 2018 para determinar si la educación es una herramienta eficiente, para romper los ciclos intergeneracionales de pobreza. Para construir el primer pseudo-panel mexicano, se utilizaron 9 presentaciones de la ENIGH.\u0000Los resultados muestran que los estudiantes mexicanos tienen una probabilidad promedio de abandonar la escuela de 84% desde el momento en que están en edad de iniciar la educación formal y hasta los 18 años, cifra que se incrementa en áreas rurales, y el riesgo de padecer deserción escolar varía en función de la edad, el género y el lugar de residencia. Conviene mencionar que, en algunas zonas, la condición de pobreza empeora; han pasado más de tres décadas, sin que esta situación mejore en México. Se requiere de políticas públicas que mitiguen la deserción escolar entre la población más vulnerable, generando así alternativas para reducir la pobreza.\u0000Abstract\u0000Poverty has been the objective of innumerable research; however, this article aims to know the effect of this phenomenon on school dropout using survival models from a longitudinal perspective and using the period between 2002 and 2018 to determine if education is an efficient tool to break intergenerational cycles of poverty. To build the first Mexican pseudo-panel, 9 periods of the ENIGH were used.\u0000The results show that the households experiencing poverty in the initial stage of the period are not able to get out of poverty. It is worth mentioning that in some areas this condition worsens, more than three decades have passed without this situation improving in Mexico. Therefore, public policies are needed that address this serious problem, the most innovative theories indicate that minors must attend especially from early childhood to obtain authentic positive effects on society.","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48209020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Strategic Environmental Policies in the Presence of Differentiated Goods","authors":"R. S. Espinosa Ramírez, Salvador Sandoval","doi":"10.29105/ensayos41.1-3","DOIUrl":"https://doi.org/10.29105/ensayos41.1-3","url":null,"abstract":"We develop a theoretical model of partial equilibrium where firms, located in a country, compete and produce differentiated goods in a duopolistic market. Emission of pollution is related to production, and firms produce their output using different levels of polluting technology. To control pollution emission, the government applies discriminatory pollution quotas considering the benefits for firms, consumers, and environmental damage. The results show that if the disutility to be polluted is very high, the government imposes a zero-emission quota on the companies. But, if such disutility is not significantly high, it allows a certain amount of emissions, imposing different quotas on firms depending on the levels of technology they use to control their emissions. The proposed model stresses the importance of the rational establishment of strategic environmental policies, which benefit all economic agents in the market, firms, consumers, and the environment.\u0000 \u0000Resumen\u0000Desarrollamos un modelo teórico de equilibrio parcial donde las empresas, ubicadas en un país, compiten y producen bienes diferenciados en un mercado duopolístico. La emisión de contaminación está relacionada con la producción, y las empresas producen utilizando diferentes niveles de tecnología contaminante. Para controlar la emisión de contaminación, el gobierno aplica cuotas de contaminación discriminatorias teniendo en cuenta el beneficio para las empresas, los consumidores y el daño ambiental. Los resultados muestran que si la desutilidad a contaminar es muy alta, el gobierno impone una cuota de cero emisiones a las empresas. Pero, si dicha desutilidad no es significativamente alta, permite una cierta cantidad de emisiones, imponiendo diferentes cuotas a las empresas dependiendo de los niveles de tecnología que utilizan para controlar sus emisiones. El modelo propuesto subraya la importancia del establecimiento racional de políticas ambientales estratégicas, que actúen en beneficio de todos los agentes económicos en el mercado, las empresas, los consumidores y el medio ambiente.","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44605213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modelo de puntuación crediticia para tarjeta de crédito en México: una aproximación logística","authors":"Marco Antonio Reyes Morales, Miriam Sosa","doi":"10.29105/ensayos41.1-2","DOIUrl":"https://doi.org/10.29105/ensayos41.1-2","url":null,"abstract":"El riesgo de crédito es una de las principales preocupaciones de los organismos de supervisión y regulación financiera, así como de las instituciones bancarias. Así, se propone un modelo de puntuación crediticia basado en una regresión logística, para analizar la probabilidad de incumplimiento por segmentos de una cartera de clientes de tarjeta de crédito de una institución mexicana. Los resultados muestran que el modelo propuesto tiene un alto nivel de predictibilidad y de estabilidad, tanto fuera como dentro del periodo de modelado, la comprobación de monotonicidad, también asegura que el modelo tenga un alto nivel de precisión. La originalidad subyace en que existen escasos estudios sobre modelos de puntuación crediticia para México, el resultado del modelo tiene alto nivel de precisión y arroja como resultado una tabla de puntuación de fácil interpretación para el personal bancario. Se concluye que el modelo es confiable y con alto nivel de ajuste.","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42935094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Héctor Paulino Elizalde Guzmán, M. Á. Martínez Damián, Jose de Jesus Arana Coronado, Martha Elva Ramírez Guzmán
{"title":"Impacto del riesgo-país en la inversión extranjera directa en México","authors":"Héctor Paulino Elizalde Guzmán, M. Á. Martínez Damián, Jose de Jesus Arana Coronado, Martha Elva Ramírez Guzmán","doi":"10.29105/ensayos41.1-1","DOIUrl":"https://doi.org/10.29105/ensayos41.1-1","url":null,"abstract":"Un mayor flujo de inversión extranjera directa (IED) en México puede servir de financiamiento para la fabricación de bienes y servicios que contribuyan al crecimiento económico; sin embargo, los inversionistas enfrentan riesgos que pueden llevarlos a bajos niveles de ganancias o incluso pérdidas. A través de un modelo de transferencia, este documento tiene como objetivo revelar la relación entre el Índice de Riesgo-País (IRP) y la IED en México, y con ello contribuir al conocimiento sobre el comportamiento de los capitales extranjeros. Los resultados confirmaron la relación inversa entre estas variables; así mismo, la función de correlación cruzada indica que el IRP tiene un efecto retardado cuatro trimestres sobre la IED.\u0000 Por tanto, si este país quiere colocarse como una alternativa viable para los capitales extranjeros y beneficiarse de las inversiones a largo plazo, se deberán implementar políticas que lo coloquen como una economía de bajos índices de riesgo.\u0000 \u0000Abstract\u0000 \u0000\u0000A greater flow of foreign direct investment (FDI) in Mexico can serve as financing for the manufacture of goods and services that contribute to economic growth; however, investors face risks that can lead to low levels of profits or even losses. Through a transfer model, this document aims to reveal the relationship between the Country Risk Index (IRP) and FDI in Mexico, and thereby contribute to knowledge about the behavior of foreign capital. The results confirmed the inverse relationship between these variables; Likewise, the cross-correlation function indicates that the IRP has a lagged effect of four quarters on FDI. Therefore, if this country wants to position itself as a viable alternative for foreign capital and benefit from long-term investments, policies that place it as a low-risk economy should be implemented.\u0000\u0000 \u0000 ","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47492114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Interrelación entre la competitividad internacional y el desarrollo humano en la región Asia-Pacífico","authors":"A. I. Zamora Torres, Mitchell Rigel Ortiz Zamora","doi":"10.29105/ensayos40.2-4","DOIUrl":"https://doi.org/10.29105/ensayos40.2-4","url":null,"abstract":"Mucho se habla del impacto que tiene la competitividad en el bienestar y desarrollo humano de los países, no obstante, existe en la actualidad un debate al respecto, puesto que pareciera que esta relación es inexistente; por lo que, el presente trabajo tiene como objetivo identificar la interrelación entre las variables de competitividad internacional (tecnología, comercio internacional y tamaño de mercado) respecto de las variables de desarrollo humano, como son: educación, ingreso y salud para la región Asia Pacifico durante el periodo 2010 a 2019; mediante la técnica Partial Least Squares (PLS). La aplicación de dicha técnica es uno de los elementos de originalidad del presente estudio, además del impacto social que representa conocer cuáles variables e indicadores de la competitividad realmente permean el desarrollo social de las economías. Los resultados muestran que existe una relación entre las variables analizadas, siendo la relación más cercana la que existe con la variable ingreso.\u0000 \u0000Abstract\u0000 \u0000\u0000A lot has been said about the impact of competitiveness on both the human development and wellbeing of the population of a country. Yet, this is a contested subject due to the almost non-existent nature of this relationship. This paper aims to identify the interrelation between the variables of international competitiveness (technology, market size, and international trade) and those regarding human development like education, income, and health, for the Asia-Pacific region in the period from 2010 to 2019; by using the Partial Least Squares (PLS) technique. The application of this technique is one of the original elements of the present study and the social impact represented by knowing which variables and indicators of competitiveness permeate the social development of economies. The results show a relationship between the variables analyzed, being the closest relationship with the variable income.\u0000","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44455040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antonio Ruiz-Porras, Javier Emmanuel Anguiano-Pita
{"title":"Los precios del petróleo y la actividad económica en México","authors":"Antonio Ruiz-Porras, Javier Emmanuel Anguiano-Pita","doi":"10.29105/ensayos40.2-3","DOIUrl":"https://doi.org/10.29105/ensayos40.2-3","url":null,"abstract":"Estudiamos la interdependencia entre los precios del petróleo y la actividad económica, en México, usando un análisis de spillovers estáticos y dinámicos en los dominios del tiempo y de la frecuencia. Los principales hallazgos muestran, que: 1) Las relaciones entre los precios del petróleo y la actividad económica han fluctuado en el tiempo; 2) las variaciones de los precios del petróleo tienen efectos de corto plazo y sus volatilidades, efectos de largo plazo sobre la actividad económica; 3) los precios del petróleo MAYA tienen las mayores interdependencias con la actividad económica; 4) los spillovers netos más altos entre los precios del petróleo y la actividad económica ocurrieron entre abril de 2009 y junio de 2012. El estudio usa series de variaciones y volatilidades mensuales de los precios spot del petróleo MAYA, WTI y Brent y del indicador IGAE, del período de febrero de 1993 a diciembre de 2019.\u0000Abstract\u0000We study the interdependence between oil prices and economic activity in Mexico using an analysis of static and dynamic spillovers in the time and frequency domains. The main findings show that: 1) The relationships between oil prices and economic activity have fluctuated over time; 2) variations in oil prices have short-run effects and their volatilities have long-run effects on economic activity; 3) MAYA oil prices have the main interdependences with economic activity; 4) the highest net spillovers between oil prices and economic activity occurred between April 2009 and June 2012. The study uses a series of variations and monthly volatilities of the spot oil prices MAYA, WTI, and Brent, and the IGAE indicator from February 1993 to December 2019.","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49022895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Medición de la actividad económica en las principales zonas turísticas de playa en México a través imágenes satelitales","authors":"Irving Llamosas-Rosas, Erick Rangel González, Maritza Sandoval Bustos","doi":"10.29105/ensayos40.2-1","DOIUrl":"https://doi.org/10.29105/ensayos40.2-1","url":null,"abstract":"\u0000\u0000\u0000\u0000Se utiliza la metodología desarrollada por Henderson, Storeygard y Weil (2012), quienes analizan fotografías satelitales para medir el desempeño económico de las principales 15 zonas turísticas de playa en México, para el periodo de 1993 a 2017, tomando en consideración que son subregiones y muchas pueden abarcar más de una entidad federativa. El análisis se basa en la existencia de una correlación directa y positiva entre la actividad económica y la luminosidad observada desde el espacio. Los resultados indican que las áreas de mayor crecimiento se ubican en la región centro-norte del país, específicamente en Baja California Sur. En el periodo de análisis, existió una gran heterogeneidad en el grado de crecimiento económico entre los distintos destinos de playa en México, en donde se destacan dos factores, los destinos de playa orientados al turismo receptivo y los niveles de inseguridad en dichas zonas.\u0000Abstract\u0000We use the methodology developed by Henderson, Storeygard, and Weil (2012), which analyze satellite photographs to measure the economic performance of the main 15 beach tourist areas in Mexico for the 1993-2017 period, considering that these are sub-regions and many of them spread over more than one state's boundaries. The analysis is based on the fact that there is a direct and positive correlation between economic activity and luminosity observed from space. The results indicate that the areas of higher growth rates are in the central-northern region, specifically in Baja California Sur. The analysis period exhibits significant heterogeneity in the degree of economic growth among the different beach destinations in Mexico, where two factors stand out: beach destinations oriented to receptive tourism and levels of insecurity in these areas.\u0000\u0000\u0000\u0000","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49259862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. A. Alvarado, Miroslava Quiroga, Leonardo E. Torre, Daniel Chiquiar
{"title":"REGIONAL INPUT-OUTPUT MATRICES AND AN APPLICATION TO ANALYZE A MANUFACTURING EXPORT SHOCK IN MEXICO","authors":"J. A. Alvarado, Miroslava Quiroga, Leonardo E. Torre, Daniel Chiquiar","doi":"10.29105/ensayos38.2-4","DOIUrl":"https://doi.org/10.29105/ensayos38.2-4","url":null,"abstract":"Based on the national Input-Output Matrix (IOM) 2012 calculated by INEGI, we estimate with the Flegg approach four regional Input-Output Matrices (RIOMs) using Banco de México’s regionalization (Northern, North-Central, Central and Southern). These RIOMs are employed to evaluate the impact on regional gross output, value added and employment from a 10,000 million dollar shock on Mexican manufacturing exports. The results show that the effects on the absolute values of gross output, value added and employment in the North are clearly larger than those estimated for the other regions. Another finding is that the total effects of the regional shocks tend to concentrate in the manufacturing sector, with the highest concentration observed in the North, and the lowest in the South. It is also shown that the North is, by far, the region experiencing the greatest change in its value added relative to GDP, followed by the North Central, the Central and the South. The results suggest a strong linkage between the manufacturing sector and tertiary activities, particularly commerce and services in the central regions, as well as between manufacturing and oil and gas extraction in the South.","PeriodicalId":53025,"journal":{"name":"Ensayos Revista de Economia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49537356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}