C. Pérez, Dania Rodríguez Correa, Pedro Guerrero Posada, Bárbara Mola Fines, Charissa Martínez Der, Miguel A. Machado Caraballo, G. Martínez
The effects of the climatic change in the agricultural sector are more perceptible each day, this is reflected basically through the periods of drought that are increased in frequency and intensity. This reality forces us to carry out an efficient use of the available water; the inadequate water use pumped for the irrigation implies the low efficiency of the electric power for this activity. With the objective of valuing the effectiveness of the energy used in this activity in practice, a pilot study was conducted in Victoria II belonging to the Camagüey Agrarian enterprise. The electric power consumption in the irrigation was controlled in all the irrigation systems of the productive unit during the campaign of the cultivation of the bean in the year 2017, the productivity of the energy used in the irrigation in all irrigation systems of the technologies of pivot machines and sprinkler irrigation systems was determined, the obtained values were compared taking like reference the most favorable result. The evaluations demonstrated that during the cycle of the cultivation, losses take place in the use of the water due to the imperfect irrigation programming and low uniformity of distribution of the water, which is reflected in the low productivity of irrigation water and energy together with the concern about planting. This shows that the efficiency index of pivot machine is only 76%, and the efficiency index of sprinkler system is 63%.
{"title":"Improvement's energy used in sprinkler irrigation systems","authors":"C. Pérez, Dania Rodríguez Correa, Pedro Guerrero Posada, Bárbara Mola Fines, Charissa Martínez Der, Miguel A. Machado Caraballo, G. Martínez","doi":"10.32629/rwc.v5i1.1108","DOIUrl":"https://doi.org/10.32629/rwc.v5i1.1108","url":null,"abstract":"The effects of the climatic change in the agricultural sector are more perceptible each day, this is reflected basically through the periods of drought that are increased in frequency and intensity. This reality forces us to carry out an efficient use of the available water; the inadequate water use pumped for the irrigation implies the low efficiency of the electric power for this activity. With the objective of valuing the effectiveness of the energy used in this activity in practice, a pilot study was conducted in Victoria II belonging to the Camagüey Agrarian enterprise. The electric power consumption in the irrigation was controlled in all the irrigation systems of the productive unit during the campaign of the cultivation of the bean in the year 2017, the productivity of the energy used in the irrigation in all irrigation systems of the technologies of pivot machines and sprinkler irrigation systems was determined, the obtained values were compared taking like reference the most favorable result. The evaluations demonstrated that during the cycle of the cultivation, losses take place in the use of the water due to the imperfect irrigation programming and low uniformity of distribution of the water, which is reflected in the low productivity of irrigation water and energy together with the concern about planting. This shows that the efficiency index of pivot machine is only 76%, and the efficiency index of sprinkler system is 63%.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114370361","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. Mariscal-Romero, Tunuary Roberto Chávez-González, Judith Arciniega-Flores
A physical characterization of the drainage area of the Bahía de Navidad, Jalisco, Mexico was carried out, based on different parameters and hydrographic indices. The results allowed to identify and define more precisely the baseline of the hydrographic behavior of three small "sub" basins that drain and flow into Pacific Ocean. 1) Arroyo El Pedregal, a high-risk creek, impacts independently on San Patricio-Melaque. 2) Arroyo El Organito, a moderate risk creek, runs into El Tule lagoon, and surrounds urbanized areas. 3) Arroyo Seco, its low hazard determines the hydrological conditions of Barra de Navidad lagoon. In conclusion, environmental deterioration, high degree of ecological fragmentation and deforestation, coupled with hydrographic specificities calculated by indexes, make them highly susceptible in different degrees to situations of risk and emergency due to floods and alluvial landslides, in face of increasingly frequent and powerful hydrometeorological events in recent years.
根据不同的参数和水文指数，对墨西哥哈利斯科州Bahía de Navidad流域进行了物理表征。研究结果可以更精确地识别和定义三个汇入太平洋的小“子”盆地的水文行为基线。1)Arroyo El Pedregal是一条高风险的小溪，对圣帕特里西奥-梅拉克有独立的影响。2) Arroyo El Organito是一条中等风险的小溪，流入El Tule泻湖，环绕着城市化地区。3) Arroyo Seco的低危险性决定了Barra de Navidad泻湖的水文条件。综上所述，近年来，面对日益频繁和强大的水文气象事件，环境恶化、生态破碎化程度高、森林砍伐严重，再加上指数计算的水文特性，使其在不同程度上极易受到洪水和冲积性滑坡等风险和应急情况的影响。
{"title":"Hydrographical characteristic of basins of Bahia de Navidad, Jalisco, Mexico","authors":"J. Mariscal-Romero, Tunuary Roberto Chávez-González, Judith Arciniega-Flores","doi":"10.32629/rwc.v5i1.1106","DOIUrl":"https://doi.org/10.32629/rwc.v5i1.1106","url":null,"abstract":"A physical characterization of the drainage area of the Bahía de Navidad, Jalisco, Mexico was carried out, based on different parameters and hydrographic indices. The results allowed to identify and define more precisely the baseline of the hydrographic behavior of three small \"sub\" basins that drain and flow into Pacific Ocean. 1) Arroyo El Pedregal, a high-risk creek, impacts independently on San Patricio-Melaque. 2) Arroyo El Organito, a moderate risk creek, runs into El Tule lagoon, and surrounds urbanized areas. 3) Arroyo Seco, its low hazard determines the hydrological conditions of Barra de Navidad lagoon. In conclusion, environmental deterioration, high degree of ecological fragmentation and deforestation, coupled with hydrographic specificities calculated by indexes, make them highly susceptible in different degrees to situations of risk and emergency due to floods and alluvial landslides, in face of increasingly frequent and powerful hydrometeorological events in recent years.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132319436","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}
María Chamba-Ontaneda, A. Fries, Priscilla Massa-Sánchez
The analysis of demographic pressure on hydrologic resources is fundamental for a sustainable water management. In this work, the Water Demographic Pressure Index (IPDA) was determined for the 55 most populated cantons of Ecuador, combining five variables: distribution of the population, population in arid zones, estimated domestic water consumption, population growth and water stress. The results obtained indicated that the greatest demographic pressure on water resources is concentrated at the Coast, while the lowest pressure occurs in the Amazon region. These results are mainly due to the relative population concentration and the hydrological and climatic conditions, affecting the amount of available water.
{"title":"Demographic pressure on water: a regional analysis for Ecuador","authors":"María Chamba-Ontaneda, A. Fries, Priscilla Massa-Sánchez","doi":"10.32629/rwc.v5i1.1090","DOIUrl":"https://doi.org/10.32629/rwc.v5i1.1090","url":null,"abstract":"The analysis of demographic pressure on hydrologic resources is fundamental for a sustainable water management. In this work, the Water Demographic Pressure Index (IPDA) was determined for the 55 most populated cantons of Ecuador, combining five variables: distribution of the population, population in arid zones, estimated domestic water consumption, population growth and water stress. The results obtained indicated that the greatest demographic pressure on water resources is concentrated at the Coast, while the lowest pressure occurs in the Amazon region. These results are mainly due to the relative population concentration and the hydrological and climatic conditions, affecting the amount of available water.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132347818","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}
The starting point of this research is the identification of a normative and technical gap in planning areas of influence of reservoirs for power generation, understood these as water bodies in which an important part of water supply resources is concentrated. In this sense, a description of the problem and the importance of considering hydroelectric megaprojects as spatial analysis units is made; then, the determination of the land carrying capacity is proposed as a methodological tool, since it is considered that it functions as an Accumulative Impact Assessment, inasmuch as it allows to understand the configuration of the territory after the start of operation of the hydroelectric project and, based on this information, become an input for decision-making with technical support, that answer the question of what to do sustainably in those territories.
{"title":"Planning of areas of influence of reservoirs. Proposal from land carrying capacity","authors":"Nataly Montoya-Restrepo, Sandra Yanneth Ríos-Gallego, Joaquín Guillermo Hincapié-Pérez","doi":"10.32629/rwc.v4i1.1076","DOIUrl":"https://doi.org/10.32629/rwc.v4i1.1076","url":null,"abstract":"The starting point of this research is the identification of a normative and technical gap in planning areas of influence of reservoirs for power generation, understood these as water bodies in which an important part of water supply \u0000resources is concentrated. In this sense, a description of the problem and the importance of considering hydroelectric megaprojects as spatial analysis units is made; then, the determination of the land carrying capacity is proposed as a methodological tool, since it is considered that it functions as an Accumulative Impact Assessment, inasmuch as it allows to understand the configuration of the territory after the start of operation of the hydroelectric project and, based on this information, become an input for decision-making with technical support, that answer the question of what to do sustainably in those territories.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123120676","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}
With the continuous development of society and the improvement of people's living standard, the construction scale of construction project is increasing and the construction period also increases. In the construction process, the weather changes are often one of the key factors aff ecting the progress and quality of the project. Rainy season construction is the inevitable problem in the construction process, the rainy season construction facing rain, wind, high temperature and other adverse environmental factors, and can directly endanger the production safety, to the enterprise to bring immeasurable losses, so science reasonable organization of construction, to take security technical measures, and actively respond to the rainy season construction of various dangerous situations, to improve the ability to resist risks, to ensure the safety of production, is of great signifi cance. Based on the theory of construction safety management and the characteristics of rainy season, this paper analyzes and controls according the experience and technical characteristics of engineering construction. To ensure the progress and quality of construction and the safety of construction, the principle of minimizing the loss, put forward the corresponding maintenance measures to enhance the safety of the rainy season construction, to enhance the economic interests of enterprises.
{"title":"The Related Problems in the Construction of the Rainy Season","authors":"Xiaowei Chen","doi":"10.32629/rwc.v1i1.5","DOIUrl":"https://doi.org/10.32629/rwc.v1i1.5","url":null,"abstract":"With the continuous development of society and the improvement of people's living standard, the construction scale of construction project is increasing and the construction period also increases. In the construction process, the weather changes are often one of the key factors aff ecting the progress and quality of the project. Rainy season construction is the inevitable problem in the construction process, the rainy season construction facing rain, wind, high temperature and other adverse environmental factors, and can directly endanger the production safety, to the enterprise to bring immeasurable losses, so science reasonable organization of construction, to take security technical measures, and actively respond to the rainy season construction of various dangerous situations, to improve the ability to resist risks, to ensure the safety of production, is of great signifi cance. Based on the theory of construction safety management and the characteristics of rainy season, this paper analyzes and controls according the experience and technical characteristics of engineering construction. To ensure the progress and quality of construction and the safety of construction, the principle of minimizing the loss, put forward the corresponding maintenance measures to enhance the safety of the rainy season construction, to enhance the economic interests of enterprises.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115039716","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}
In building engineering, building waterproofing technology is a comprehensive and highly applied engineering science and technology. It is an important part of construction technology. It is important to improve the function of building use and production, quality of life and improve the living environment. Waterproof engineering is a systematic project, which involves the waterproof material, waterproof engineering design, construction technology, the management of the building and other aspects. The task of building waterproofing project is to synthesize all the above factors, to carry out all-round evaluation, select the high-performance waterproof material to meet the requirements, and carry out reliable, durable, reasonable and economical waterproof function engineering design, careful organization, careful construction, maintenance management system to meet the buildings and structures of the waterproof durability, to achieve high quality waterproofi ng and good comprehensive benefi ts. At the same time, waterproof engineering is a demanding professional technology, so the construction of specialization is to ensure that the quality of roof waterproofi ng works the key, if construction operation is not serious, the technology is not enough, and the consequences will inevitably lead to failure of waterproofing works. Quality of waterproofing works the overall quality requirements of building waterproofi ng works are: impermeable to leakage, to ensure smooth drainage, so that the building has a good waterproof and use function. The quality of building waterproofi ng works is superior to waterproofi ng material, waterproof design, waterproof construction and maintenance management.
{"title":"Application of Waterproof Technology in Construction Engineering","authors":"Jianglong Du","doi":"10.32629/RWC.V1I1.1","DOIUrl":"https://doi.org/10.32629/RWC.V1I1.1","url":null,"abstract":"In building engineering, building waterproofing technology is a comprehensive and highly applied engineering science and technology. It is an important part of construction technology. It is important to improve the function of building use and production, quality of life and improve the living environment. Waterproof engineering is a systematic project, which involves the waterproof material, waterproof engineering design, construction technology, the management of the building and other aspects. The task of building waterproofing project is to synthesize all the above factors, to carry out all-round evaluation, select the high-performance waterproof material to meet the requirements, and carry out reliable, durable, reasonable and economical waterproof function engineering design, careful organization, careful construction, maintenance management system to meet the buildings and structures of the waterproof durability, to achieve high quality waterproofi ng and good comprehensive benefi ts. At the same time, waterproof engineering is a demanding professional technology, so the construction of specialization is to ensure that the quality of roof waterproofi ng works the key, if construction operation is not serious, the technology is not enough, and the consequences will inevitably lead to failure of waterproofing works. Quality of waterproofing works the overall quality requirements of building waterproofi ng works are: impermeable to leakage, to ensure smooth drainage, so that the building has a good waterproof and use function. The quality of building waterproofi ng works is superior to waterproofi ng material, waterproof design, waterproof construction and maintenance management.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117279129","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}
The present study conducted a detailed analytical research from the aspect of hydrodynamics, on the air fl ow of an exhaust fan model selection influenced by model selection. The effects of friction, local resistance, duct diameter and radius of curvature of elbow on air fl ow and pressure of a pipeline system are discussed. The characteristics of centrifugal fan and pipe network of exhaust system, and the relationship between actual resistance and rated fl ow/ pressure are also discussed. Using FLUENT, acomputational fl uid dynamics software, the 3D gas fl ow inside 4-73 №10D centrifugal ventilator was numerically simulated and analyzed, and the pressure and velocity distribution of each part are analyzed emphatically.
{"title":"Hydrodynamic Analysis of Gas Flow in Centrifugal Ventilator","authors":"Yue Yang","doi":"10.32629/rwc.v1i1.3","DOIUrl":"https://doi.org/10.32629/rwc.v1i1.3","url":null,"abstract":"The present study conducted a detailed analytical research from the aspect of hydrodynamics, on the air fl ow of an exhaust fan model selection influenced by model selection. The effects of friction, local resistance, duct diameter and radius of curvature of elbow on air fl ow and pressure of a pipeline system are discussed. The characteristics of centrifugal fan and pipe network of exhaust system, and the relationship between actual resistance and rated fl ow/ pressure are also discussed. Using FLUENT, acomputational fl uid dynamics software, the 3D gas fl ow inside 4-73 №10D centrifugal ventilator was numerically simulated and analyzed, and the pressure and velocity distribution of each part are analyzed emphatically.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129005978","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}
A device that converts hydraulic energy from a hydraulic cylinder to mechanical energy is known as actuator. The actuator is a direct performer, and has the opposite role of the hydraulic pump from the point of view of energy conversion. According to principle of energy conversion, the actuators can be divided into three types: hydraulic motors, hydraulic cylinders, and swing hydraulic motor (also called swing hydraulic cylinder). The hydraulic motor is a hydraulic actuator that continuously rotates and outputs torque; and the hydraulic cylinder is a hydraulic actuator for reciprocating linear motion and output. This manual is of the hydraulic cylinder working environment and requirements to determine the pressure of the hydraulic cylinder, carrying capacity which determine the cylinder diameter, wall thickness and piston rod diameter. The process of parts is determined based on the requirements of the hydraulic cylinder parts. Based on the precision requirements of parts, the processing method is determined and is used in the making of process cards to complete the processing of parts.
{"title":"Design and Realization of Hydraulic Cylinder","authors":"P. Luo","doi":"10.32629/RWC.V1I1.2","DOIUrl":"https://doi.org/10.32629/RWC.V1I1.2","url":null,"abstract":"A device that converts hydraulic energy from a hydraulic cylinder to mechanical energy is known as actuator. The actuator is a direct performer, and has the opposite role of the hydraulic pump from the point of view of energy conversion. According to principle of energy conversion, the actuators can be divided into three types: hydraulic motors, hydraulic cylinders, and swing hydraulic motor (also called swing hydraulic cylinder). The hydraulic motor is a hydraulic actuator that continuously rotates and outputs torque; and the hydraulic cylinder is a hydraulic actuator for reciprocating linear motion and output. This manual is of the hydraulic cylinder working environment and requirements to determine the pressure of the hydraulic cylinder, carrying capacity which determine the cylinder diameter, wall thickness and piston rod diameter. The process of parts is determined based on the requirements of the hydraulic cylinder parts. Based on the precision requirements of parts, the processing method is determined and is used in the making of process cards to complete the processing of parts.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133010621","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}
In recent years, due to the rapid increase of China's economic level, agriculture and industry have developed vigorously, and the demand for electricity has increased accordingly. Water conservancy project construction investment is also increasing, too much water conservancy construction projects will inevitably affect the natural environment, the human environment. China's water conservancy and hydropower construction is facing a diffi cult task. In terms of environmental impact, compared with other projects, water conservancy and hydropower projects have prominent characteristics: the impact of a wide geographical area, affecting the population, the local social, economic and ecological environment is huge, the external environment on the project also exert a huge impact The At present, the whole society has paid more and more attention to environmental problems, and the environmental quality has become higher and higher. Environmental problems have become one of the restrictive factors in the construction of water conservancy and hydropower projects. As the human environment continues to deteriorate, the public is increasingly concerned about environmental issues and sustainable development. At the same time, people are also aware that the impact of agricultural water conservancy construction on the environment is also twofold, so avoid or mitigate the adverse eff ects, Fully rational use, is the water conservancy workers in the construction of agricultural water conservancy planning must be carefully studied and to solve the important issues.
{"title":"The Influence of Agricultural Water Conservancy Project on Environment","authors":"Lei Yu","doi":"10.32629/RWC.V1I1.4","DOIUrl":"https://doi.org/10.32629/RWC.V1I1.4","url":null,"abstract":"In recent years, due to the rapid increase of China's economic level, agriculture and industry have developed vigorously, and the demand for electricity has increased accordingly. Water conservancy project construction investment is also increasing, too much water conservancy construction projects will inevitably affect the natural environment, the human environment. China's water conservancy and hydropower construction is facing a diffi cult task. In terms of environmental impact, compared with other projects, water conservancy and hydropower projects have prominent characteristics: the impact of a wide geographical area, affecting the population, the local social, economic and ecological environment is huge, the external environment on the project also exert a huge impact The At present, the whole society has paid more and more attention to environmental problems, and the environmental quality has become higher and higher. Environmental problems have become one of the restrictive factors in the construction of water conservancy and hydropower projects. As the human environment continues to deteriorate, the public is increasingly concerned about environmental issues and sustainable development. At the same time, people are also aware that the impact of agricultural water conservancy construction on the environment is also twofold, so avoid or mitigate the adverse eff ects, Fully rational use, is the water conservancy workers in the construction of agricultural water conservancy planning must be carefully studied and to solve the important issues.","PeriodicalId":280522,"journal":{"name":"Region - Water Conservancy","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116280250","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：