Bulletin of the Tomsk Polytechnic University Geo Assets Engineering最新文献

{"title":"Anthropogenic load effect on formation of hydrogeological conditions of the Shirvan steppe of the Kura-Aras lowland in Azerbaijan","authors":"Chingiz J. Gulmammadov","doi":"10.18799/24131830/2024/1/4542","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4542","url":null,"abstract":"Relevance. Azerbaijan water and soil resources are limited and subject to technogenic impacts more and more every year. Use of water and demand for water in the republic are growing at a higher rate every year. On the other hand, global climate changes have a serious impact on formation of hydrogeological processes. In such circumstances, it is very important to study the formation situations of hydrogeological conditions under the influence of natural and anthropogenic factors, to use the available water resources efficiently and economically, and to take preventive measures against negative processes. Aim. To study the regularity of formation of the hydrogeological conditions of the Shirvan steppe of the Kura-Araz lowland in the Republic of Azerbaijan under the influence of natural and anthropogenic processes over a long period time. Object. Subsoil waters of the Shirvan steppe of the Kura-Araz Lowland in the Republic of Azerbaijan. Methods. Based on the results of the studies (1977 to 2020) of perennial average level of groundwater and degree of mineralization, the rate of soil salinization, the regime of groundwater and based on the materials collected in this direction, the regime types of groundwater were separated and correlative dependence was found by the method of least squares between regime types and regime-shaping factors – atmospheric sediments, river networks, irrigation water, irrigation canals, drainage, etc. The genetic types of the regime were selected according to the factors creating the regime and the synchronicity of the groundwater level change. Results. Under the influence of natural and anthropogenic factors, the level of groundwater, degree of mineralization, chemical composition, salinity and chemical composition of soils have changed. From 1958 to 2020, due to the irrigation melioration, the groundwater level of the area rose by 4.1 m, due to the infiltration of surface water and removal of mineralized water through drainage, their mineralization rate decreased by 16.2 g/l. Based on the results of the research on changes in the level, degree of mineralization and chemical composition of groundwater, soil salinity and chemical composition, and based on the analysis of archival materials collected in this direction, groundwater regime types were selected and correlative dependence between regime types and regime-creating factors by the method of least squares was defined. Due to the synchronicity of regime-creating factors and groundwater level changes, the genetic types of the regime were selected – climate, hydrological, irrigation, irrigation-watering, drainage, irrigation-watering and the fields of their distribution areas were determined.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140476247","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":"Improvement of a well bottomhole zone treatment applying a spent sulfuric acid solution","authors":"Marat Ya. Khabibullin","doi":"10.18799/24131830/2024/1/4206","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4206","url":null,"abstract":"Relevance. Caused by the need to ensure highly efficient distribution of spent sulfuric acid solutions during acid treatment of a production well bottomhole zone. The proposed method increases the efficiency of this process by growth of efficiency of production wells exploiting terrigenous limestone reservoirs in the wellbore zone. Aim. To develop and propose a method for using spent sulfuric acid solutions during acid treatment of a production well bottomhole zone, a methodology for its application. The essence of the method is that to increase the efficiency of production wells exploiting terrigenous reservoirs, solutions of sulfuric acid or its derivatives, in particular spent sulfuric acid, are used as an acid reagent. Objects. It was revealed that the surface activity of spent sulfuric acid in fresh water at the interface with hydrocarbon liquids is significantly greater than the activity of solutions of commercial hydrochloric and sulfuric acids. Based on physical and chemical studies, it has been established that spent sulfuric acid solutions can be used in acid treatment of the bottomhole zone of wells to increase formation fluid production. Solutions of hydrochloric (HCl) and sulfuric (H2SO4) acids, as well as waste – spent sulfuric acid, were used as experimental liquids. Compared to commercial acids, the spent sulfuric acid solutions have the greatest ability to interact in carbonate rocks.   Methods. Models of porous medium were created in experimental columns, which were pipes made of organic glass with a length of 0.5 m and a diameter of 0.025 m. The manufactured model of the porous medium was evacuated and saturated with fresh water, after which the water permeability was determined, then the water was replaced with acid solutions. After a certain time for the acid to react with the carbonates of the porous medium, the water permeability was again determined. The experiments were carried out at room temperature and a pressure gradient of 0.05...0.2 MPa/m. Moreover, after completion of the treatment of the near-wellbore zone in order to prevent the deposition of sediments formed in the pores as a result of the interaction of acid with carbonates, the well is put into operation after an eight-hour holding period with large depressions in the near-wellbore zone. Results. Visual observations shown that water filtration through the porous medium at high pressure gradients leads to a large removal of sediments from the porous medium. This is the consequence of an increase in the porous medium permeability after treating it with a 15% solution of waste sulfuric acid. Thus, laboratory experiments shown that the use of spent sulfuric acid solutions under certain conditions can increase well productivity.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"484 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140478282","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":"Determination of controlled parameters for designing a network for geotechnical monitoring of underground pipelines in the cryolithozone","authors":"Andrey A. Filimonov, Lyudmila A. Strokova","doi":"10.18799/24131830/2024/1/4389","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4389","url":null,"abstract":"Relevance. Determined by the need for geotechnical monitoring in the areas of distribution of permafrost soils for underground pipelines. The geotechnical system “permafrost soil – underground pipeline” is subject to the influence of exogenous geological processes during operation, cyclical changes in the state of soils of the seasonal layer of thawing and freezing, thawing of permafrost soils from the thermal effect of the pipeline, changing the plan-altitude position. The variety of schemes for interaction of the pipeline body with varieties of lithological structure of permafrost soils along the route should be worked out in detail at the design stage and also assessed in detail during geotechnical monitoring of the pipeline. The lack of regulatory requirements for the monitored parameters of underground pipelines leads to the use of non-standardized and varied monitoring networks from project to project. The lack of standard values ​​for the maximum deformations of an underground pipeline leads to the need to use calculation methods for determining the maximum deformations of the base and pipeline. The authors proposed the use of a comprehensive methodology for calculating underground pipelines, developed by employees of JSC TomskNIPIneft to determine the maximum permissible deformations of the pipeline at each point of the route with the presence of permafrost soils at the design stage, with further use of the results obtained as a controlled criterion when conducting geotechnical monitoring. Aim. To determine the controlled parameters for geotechnical monitoring of underground pipelines in the cryolithozone at the operational stage based on the application of a comprehensive methodology for calculating underground pipelines, as well as the formation of requirements for the system of information points. Methods. Review of the regulatory framework for geotechnical monitoring, analysis and evaluation of the applied methods and designs for monitoring underground pipelines, analysis of a comprehensive methodology for calculating underground pipelines in relation to the purposes of geotechnical monitoring. Results. Based on the results of the review of regulatory and technical documentation, the authors have revealed a lack of specification of methods, equipment, volume of the geotechnical monitoring network and frequency of pipeline monitoring, as well as the requirement for the use of the calculation method of limiting deformations and the lack of description of possible methods. A detailed analysis of the complex methodology for pipeline calculations, developed at JSC TomskNIPIneft, substantiates its use for geotechnical monitoring purposes, and notes the advantage of the methodology in the detail of the obtained limit values ​​of deformation with an accuracy of one meter along the axis of the pipeline route. The authors studied the methods and designs used for monitoring deformations of underground pipelines and established the compatibility ","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"400 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140472845","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":"Technology for killing gas wells at managed pressure","authors":"Mikhail V. Dvoynikov, Yakov D. Minaev, Vildan V. Minibaev, Evgenii Yu. Kambulov, Mikhail E. Lamosov","doi":"10.18799/24131830/2024/1/4315","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4315","url":null,"abstract":"Relevance. The need to solve the problem of developing gas wells after multistage hydraulic fracturing. This problem consists in losses of process fluids during killing gas wells with high permeability by traditional methods, and reducing the achieved productivity of gas deposits. Aim. To develop and justify a method for gentle killing of gas and gas condensate wells after working out in operation mode. Objects. Gas and gas condensate wells after multistage hydraulic fracturing. Methods. Filtration experiment to determine the effect of killing fluid on reservoir permeability; mathematical modeling of gentle killing of a gas well using flexible tubing and equipment for work at controlled pressure; laboratory studies of the mechanical properties of the blocking pack – liquid packer. Results. According to the results of the filtration experiment, the negative effect of the silencing fluid on low-permeable gas layers is justified. The authors developed the technology of gentle killing of gas and gas condensate wells using flexible tubing and equipment for operations at controlled pressure. Laboratory studies were carried out and technological parameters were selected for the second blocking pack – a liquid packer for additional isolation of a gas reservoir. The authors constructed a mathematical model of killing gas wells using the presented technology; a calculation was carried out for the conditions of a gas condensate field in Eastern Siberia. The paper introduces the results of modeling technological operations reflecting the change in the main technological parameters during well killing.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"522 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140479761","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":"Study of the composition of high molecular asphaltenes of bituminous oils using ruthenium ion-catalyzed oxidation reaction","authors":"T. V. Cheshkova, Darya V. Ostapenko, E. Y. Kovalenko, Татyana А. Sagachenko, R. Min","doi":"10.18799/24131830/2024/1/4296","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4296","url":null,"abstract":"Relevance. Conditioned by the need to expand the amount of data on composition and structure of the asphaltene constituents of heavy oils. The data are important for creation of new and modernization of existing technologies for processing unconventional hydrocarbon raw materials. Aim. To study the composition of structural fragments in macromolecules of asphaltenes of bituminous oils from the Ashalchinskoe, Usinskoe, and Nurlatskoe oilfields using the ruthenium ion-catalyzed oxidation. Object. Fractions of high-molecular asphaltenes, which make up the bulk of the asphaltene constituents of the Ashalchinskoe, Usinskoe, and Nurlatskoe oils (94.1; 92.1 and 95.0 rel. %). Methods. Elemental analysis, cryoscopy in benzene, selective chemical destruction of Car–C bonds using a ruthenium ion-catalyzed oxidation, gas chromatography–mass spectrometry. Results. It has been established that the structure of high-molecular asphaltenes of bituminous oils from the Ashalchinskoe, Usinskoe, and Nurlatskoe oilfields contains fragments bound to the core of their molecules through Car.–C bridges and compounds trapped in the hollow cells of macromolecular entities of asphaltenes during kerogen cracking. It follows from the analysis of the oxidation products that the covalently bonded fragments are represented by C8–C32 n-alkanes, branched C9–C30 alkanes (2-methylalkanes and C15, C19, C20 isoprenoids), C22–C24 cheilanthanes, C27, C29–C33 hopanes and long chain alkyl bridges (C9–C30) connecting aromatic blocks. Most of the fragments linked by Car.–C bridges are linear paraffin chains. Typical biological markers, i. e. n-alkanes and hopanes were identified among the occluded compounds.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"38 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140477455","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":"Organic carbon in surface sediments of Chaunskaya Bay (East Siberian Sea): results of pyrolytic analysis using the Rock-Eval method","authors":"N. Poltavskaya, E. Gershelis, Aleksandr N. Charkin, E. Yaroshchuk, Natalya V. Guseva, Igor P. Semiletov","doi":"10.18799/24131830/2024/1/4415","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4415","url":null,"abstract":"Relevance. Dictated by the need to assess functioning of the biogeochemical regime of the Arctic region by studying geochemical properties of organic matter of bottom sediments on the example of the Chaunskaya Bay (East-Siberian Sea). Aim. To study the spatial variability of geochemical parameters of organic matter of bottom sediments of the Chaunskaya Bay using the Rock-Eval method, as well as to identify a possible relationship between the parameter TOC and the pelite fraction. Objects. Samples of bottom sediments of the Chaunskaya Bay (East Siberian Sea). Sampling took place in stages from three horizons (upper 0–2 cm, intermediate 2–5 cm, lower 5–10 cm) during a comprehensive scientific expedition to the R/V \"Academician Oparin\" in September–October 2020. Methods. Granulometric composition of bottom sediments was determined using the Analysette 22 NanoTec particle analyzer (Fritsch, Germany). The analysis of hydrocarbon compounds of organic matter was performed using pyrolytic analysis on the device (Rock Eval 6 Turbo of Vinci Technologies, France). Results. The results of pyrolytic analysis considered by the authors have shown that such factors as the primary productivity of the waters of the studied water area and the processes of erosion of the coastal zone play a decisive role in the formation of the composition of the TOC in bottom sediments of the Chaunskaya Bay. We also do not exclude the contribution of river runoff to the composition of the TOC in bottom sediments; however, we consider it small due to the insignificant inflow of river sediments into the waters of the studied area. The pyrolytic data obtained by us indicate that both the marine component (primary productivity) and the terrigenous component (erosion of the coastal complex) are present in the composition of the TOC in bottom sediments of the studied area.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"423 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140472805","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":"Modeling and designing the features of inflow to a horizontal gas borehole fitted with coiled tubing within the filtering interval","authors":"Sergey K. Sokhoshko","doi":"10.18799/24131830/2024/1/4141","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4141","url":null,"abstract":"Relevance. The need to study the parameters of inflow (permeability rates, production inflow profile, flow rate along the horizontal wellbore) into the horizontal gas and gas condensate wellbores, when  tubing is at the downhole zone. This allows scheduling well production rates, managing removal of water and mechanical impurities from the bottom-hole, carrying out well stimulation and completion activities, etc. Aim. To substantiate a mathematical model of the perforated horizontal gas borehole when the tubing shoe is within the perforation interval, as well as to calculate gas inflow parameters, flow rate along the wellbore and fluid permeability rates at the bottomhole zone of the wellbore. Object. Horizontal gas and gas condensate boreholes in anisotropic formations, methods for calculating gas inflow into perforated strings of horizontal boreholes, gas inflow rates and flow rates along the wellbore when tubing shoe is within the perforation interval. Methods. Modeling gas inflows into horizontal wellbores using a point source function, as well as the Leibenzon function; the use of local and hydraulic resistances theory in simulation of developing gas flow along the wellbore; determining gas inflow rates into the horizontal wellbore using the Reynolds number value. Results. The authors have carried out design calculation for the Bovanenkovskoe oil and gas condensate field using the model of gas inflow into a perforated horizontal (sloping) wellbore and analyzed the inflow parameters (flow velocity and permeability rates at the bottomhole zone, developing flow velocity along the wellbore) at various tubing shoe positions within the wellbore perforation interval. It was observed that when the tubing moves along the perforation interval the gas inflow to the wellbore can change from linear to non-linear. The authors made a conclusion that whenever extended periods of tubing positioning within the perforation interval is required, it is essential to select a low-pressure area which ensures a linear rate of gas inflow into the wellbore of a horizontal gas well.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"11 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140478531","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":"Steel degassing in continuous steel melting units","authors":"Viacheslav A. Murashov, Konstantin V. Strogonov, Andrey A. Borisov, Dmitry D. Lvov","doi":"10.18799/24131830/2024/1/4154","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4154","url":null,"abstract":"The requirements for the quality of steel products dictate the need to increase the share of evacuated steel. In addition, the growing cost of fuel, as well as the desire of society and the state to decarbonize various industries, including ferrous metallurgy, requires companies to reduce fuel costs and switch to more modern and cleaner technologies. Reducing the specific fuel consumption, and, accordingly, emissions, is possible due to the transition to continuous production, minimizing the cost of heating the equipment and maintaining the set temperature in the degasser during technological downtime. The article deals with the issues of steel melt degassing in U-type continuous degassers in continuous steel making units. Aim. To consider the influence of rarefaction of a gas bubble on the characteristic size over the melt, speed and time of its surfacing in a U-type degassing unit. Based on the obtained dependences, to determine the characteristic size of a vacuum chamber and energy effect of switching to a continuous vacuumization. Methods.. Results. The authors have determined a bubble characteristic size in a steel melt under vacuum of different degrees. They studied the effect of vacuum on vacuumization speed and the degassing unit dimensions. The energy effect of switching to continuous vacuumization was determined. The proposed methodology is valid for liquid media, the calculations are presented on the example of molten steel. Based on the conducted calculations, the depression influence on molten steel vacuumization was determined. The vacuum chamber dimensions, comparable with RH-vacuum cleaners presented at the market of similar productivity and quality of finished products, as well as reducing energy consumption for steel degassing in a continuous vacuum degasser, compared with the existing circulating installation, were determined.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"63 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140477412","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":"Mathematical modeling of rocks fracture within local structures","authors":"Sh. Kh. Gaynanov, Valeriy N. Aptukov, V. Seredin","doi":"10.18799/24131830/2024/1/4541","DOIUrl":"https://doi.org/10.18799/24131830/2024/1/4541","url":null,"abstract":"Soil massif fracturing has a significant impact on change in engineering and geological conditions and, as a result, on stability of structures. Development of tectonic fracturing of local structures, taking into account the history of the process, its mechanism, resulting stresses in the massif and subsequent deformations of the rocks, led to a change in their structure, composition and strength characteristics, activation of hypergenesis and exogenous processes. The above circumstances require careful attention to identification of areas of increased fracturing, as the most dangerous in terms of risks during the construction of engineering structures. Field methods for assessing the fracturing of rock masses are laborious. It is not always possible to conduct instrumental surveys that allow solving the final problem – establishing patterns and sizes of damaged areas within local structures. The existing mathematical models for assessing fracturing, as a rule, are used to solve local problems: assessing the stability of developed pits, water content of rock masses, degree of fragmentation of individual blocks, etc. This information is not sufficient when assessing the areal distribution of weakened zones and clarifying their boundaries, since it does not take into account the history of the development of the structure, its parameters (dimensions, amplitude of the foundation block uplift, deformation properties of rocks). Aim. To develop a mathematical model of formation of the red-colored strata tectonic fracturing zones based on deformation criterion of destruction and mechanism of development of local structures. Results. The authors have developed a new mathematical model for predicting damage (fracturing) of terrigenous rocks of the red-colored strata that make up local structures, based on the mechanism of formation of local tectonic structures of the 3rd order and the deformation criterion of destruction. The paper introduces the mathematical dependencies that make it possible to predict the size (area) of taxa based on the data on the uplift amplitude of local structures. The results of the research can be used in assessing the fracturing of massifs composed of terrigenous rocks, and make it possible to judge the regularities in distribution of weakened zones within the entire massif being assessed.","PeriodicalId":513946,"journal":{"name":"Bulletin of the Tomsk Polytechnic University Geo Assets Engineering","volume":"60 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140475434","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}