Numerical Simulation for Migration of the Pollutants in Soil

2010 ◽  
Vol 113-116 ◽  
pp. 1684-1687 ◽  
Author(s):  
Ge Hu ◽  
Shu Ai Peng ◽  
Wei Wang

In the soil environment,through analyzing the numerical solutions of pollutant migration, the time-space law of the transmission of organic pollutants in soil can be mastered, which has both theoretical and practical significance. The general mathematical model of the migration of volatile pollutant in soil was established; and typical models of pollution sources emission were calculated, and the influence of various parameters in model on calculation results were compared, such as diffusion, convection, adsorption and degradation parameters; finally a correlation analysis and discussion was made on calculation results of the pollutant concentration distribution. The calculation results show that the convection is the main reason causing pollutants migration, and the influence of volatility to migration process cannot be ignored. It provides the scientific basis and approach for the pollution forecasting and prevention.

Author(s):  
Y. Jiang ◽  
J.-R. Liu ◽  
Y. Luo ◽  
Y. Yang ◽  
F. Tian ◽  
...  

Abstract. Groundwater in Beijing has been excessively exploited in a long time, causing the groundwater level continued to declining and land subsidence areas expanding, which restrained the economic and social sustainable development. Long years of study show good time-space corresponding relationship between groundwater level and land subsidence. To providing scientific basis for the following land subsidence prevention and treatment, quantitative research between groundwater level and settlement is necessary. Multi-linear regression models are set up by long series factual monitoring data about layered water table and settlement in the Tianzhu monitoring station. The results show that: layered settlement is closely related to water table, water level variation and amplitude, especially the water table. Finally, according to the threshold value in the land subsidence prevention and control plan of China (45, 30, 25 mm), the minimum allowable layered water level in this region while settlement achieving the threshold value is calculated between −18.448 and −10.082 m. The results provide a reasonable and operable control target of groundwater level for rational adjustment of groundwater exploited horizon in the future.


Ekonomika APK ◽  
2020 ◽  
Vol 311 (9) ◽  
pp. 86-94
Author(s):  
Yurii Kernasiuk

The purpose of the article is to highlight the conceptual understanding of the cluster as an innovative organizational and economic form of production in the system of sustainable development on the example of the agricultural sector and substantiate the scientific basis for ensuring its implementation at the regional level. Research methods. When carrying out the research, a set of general scientific methods and techniques was used; monographic - in the study of domestic and foreign publications and the above-mentioned problems; a systematic approach based on the principles of systems analysis and synthesis - to substantiate the relationship between sustainable development, the efficiency of agricultural production and the cluster model; abstract-logical - for the theoretical generalization of research results and determination of measures to ensure the implementation of the cluster model of agricultural development; economic analysis - to study the efficiency of agricultural production. Research results. The essence of the cluster in modern economic theory in the context of the concept of sustainable development has been studied and analyzed. Globalization, climate change and the aggravation of socio-economic and environmental problems in many countries of the world necessitate the search for new models of economic development. It has been established that one of the most optimal organizational and economic forms of effective agricultural production in the system of sustainable development is clusters. On the example of the Kirovograd region, a scientifically grounded regional model of the development of agro-clusters in the agro-industrial complex. Scientific novelty. Based on the synthesis of scientific theories of cluster and sustainable development, further study of theoretical and methodological approaches to the definition of the essence of clusters as a promising organizational and economic form of effective agricultural production in the system of sustainable development was obtained. Practical significance. The research results will find practical use in substantiating regional strategies for the development of agro-industrial production. They can be used in educational and educational programs, when providing consulting services for the creation of projects of agricultural clusters and in further scientific research.


Author(s):  
Руслан Олександрович Костирко ◽  
Денис Вікторович Прозоров

Formulation of problem. Disclosing information about the social responsibility reguires the formation of social accounting model and the justification of specific tools that allow to reflect incomes and expenses that are due to socially responsible activity of enterprise. The aim of the research is scientific basis for preconditions, underlying assumptions, priority directions oforganization of social accounting. The object of the research is the process of accountingfor social responsibility. Methods, used in research: scientific generalization, logical and informative, induction, deduction, analysis. The hypothesis of the research is the assumption that social accounting should be oriented to disclosing information regarding socially responsible activity for different stakeholders and formation of integrated reporting. The statement of basic materials. The increasing social responsibility of enterprises specifies the necessity of the transformation of accounting in order to give transparent information about social and ecological activity for different groups of users, as well as the formation of integrated reporting. The base of development ofsocial accountingmethodology is concept of social responsibility, sustainable development, creation of value, object and classification of socially responsible expenses are specified. It is proved that the model of combined socially oriented accounting that includes the parallel reflection business operations in accounting that are due to social activity based on additional system of analytical accounts, the formation of indicators of financial and social reporting is rational. The classification of objects in the context of realization of concepts of value and socially responsible expenses is proposed in order to organize to rationally organize case -by -case social accounting. The originality and practical significance of the research are determined by the development of underlying assumptions of the development of social accounting methodology, oriented to ensuring social responsibility of the enterprise and scientific and methodical recommendations for the classification of socially responsible expenses. Conclusions and perspectives of further research. Taking into account the need sofdifferent stakeholders for disclosingin formation about effectiveness of the economic, social and ecological activity of entities, further researches will be focused on elucidation of the methodical basis of the organization of accounting for socially responsible expenses .


2020 ◽  
Vol 77 (2) ◽  
pp. 93-99
Author(s):  
Р. Л. Степанюк ◽  
С. І. Перлін

The authors of the article have studied the problems and perspectives of the formation of specific branch of forensic technology, which is devoted to DNA analysis in order to solve the tasks arising in criminal proceeding. Particular attention has been paid to the lack of a corresponding component in the domestic system of forensic technology, unlike the forensic science of foreign countries. The necessity of development of forensic DNA analysis as an independent branch of forensic technology has been argued. It is confirmed by the following main arguments: the methodology of this field of research is based on the theory of forensic identification; its objects are traces of human and other living organisms; DNA analysis technologies are developed using the achievements of different sciences and adapted to solve problems of crime detection and investigation; they are aimed to ensuring the activities of law enforcement agencies in counteracting crime; the scope of DNA analysis application in crime combating should not be limited to forensic activities; legislative regulation of collecting and using personal genetic data is essential; DNA analysis technologies in terms of practical significance and fundamental scientific basis exceed all other branches of forensic technology. The authors have offered to define forensic DNA analysis as the branch of forensic technology that studies individual genetic characteristics of living organisms contained in their DNA, in order to identify them and solve diagnostic tasks in the detection and investigation of criminal offenses. Its structure has been determined. The authors have provided perspective development directions of forensic DNA analysis: ensuring the appropriate state of legislative regulation of relations in the field of selection and use of personal genetic information; implementation of effective means and methods of detection and removal of biological traces and samples; improvement of methods of forensic DNA testing; formation of recommendations concerning the peculiarities of using DNA analysis results for proving; development of the latest technologies of forensic DNA analysis.


2020 ◽  
Vol 12 (18) ◽  
pp. 7551
Author(s):  
Xiaoxia Zhang ◽  
Tonggang Zha ◽  
Jiangang Zhu ◽  
Xiaoping Guo ◽  
Yi Liu

The application of sewage sludge (SS) in forestry is considered a viable option. However, the long-term application of SS potentially leads to metal accumulation, posing an environmental risk. Understanding the loading capacity of SS for forestry application is therefore of great significance. We used data from published studies and statistical bulletins across 31 provincial capital cities (PCCs) in China to calculate the loading capacity (LC) of SS for forestry application for each PCC. The results are as follows: (1) the mean value of the priority control threshold was 33 t·ha−1·y−1 in 31 PCCs, while the variations ranged from 7 to 91 t·ha−1·y−1 among different PCCs. The priority control thresholds (Smins) of 1/2 PCCs were higher than 30 t·ha−1·y−1 (CJ-T 362-2011). The Smin values of Lanzhou, Tianjin, Hohhot, Shanghai, and Yinchuan were above 55 t·ha−1·y−1, but Smin values of Kunming and Changsha were below 10 t·ha−1·y−1. (2) Cd was the priority control metal in most of the PCCs (27/31), with the exception of Shanghai and Guangzhou (Cu), Beijing (Hg), and Tianjin (Zn). (3) The total loading capacity was 507 million t·y−1, which was 125 times higher than the total quantity of the dry SS (404 × 104 t) for the 31 PCCs. Our results have important practical significance for the use of urban sludge forest land in China and suggest that SS disposal policies need to be tailored to specific regions. We provide a scientific basis to guide the development of national and provincial forestry policies.


2019 ◽  
Vol 11 (7) ◽  
pp. 2159 ◽  
Author(s):  
Jizhe Zhou ◽  
Quanhua Hou ◽  
Wentao Dong

There are frequent population flow and complex spatial structures in suburban villages. Understanding the spatial characteristics of population activities in suburban villages helps to coordinate the relationship between urban and rural areas and guide the development of suburban villages and the formulation of sound policies. Taking the rural area of Qin and Han New City as the research object, this paper constructs a population time-space analysis framework of “population attribute-activity characteristics-spatial analysis” based on cellphone signaling data. According to the characteristics of the population activity curve, K-means clustering algorithm was used to classify rural space and analyze their characteristics. This study has shown that migrants, who are showed as young and energetic, account for 49.8% of the local registered population per day. Bidirectional flow of residents and commuters is generally presented in urban and rural areas. The urban-rural relation curve was characterized by “double peaks”. The changes in the population in each village and the intensity of urban-rural relation were affected by location, industry and land use. The village population activity curve was classified into three categories, and nine characteristic villages are formed combined with the activity function. The research results can provide a scientific basis for urban and rural planning, spatial planning, industrial guidance and the facility layout.


Symmetry ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1446
Author(s):  
Weidong Yang ◽  
Xuehui Chen ◽  
Yuan Meng ◽  
Xinru Zhang ◽  
Shiyun Mi

In this paper, we develop a new time-space fractional constitution relation to study the unsteady boundary layer flow over a stretching sheet. For the convenience of calculation, the boundary layer flow is simulated as a symmetrical rectangular area. The implicit difference method combined with an L1-algorithm and shift Grünwald scheme is used to obtain the numerical solutions of the fractional governing equation. The validity and solvability of the present numerical method are analyzed systematically. The numerical results show that the thickness of the velocity boundary layer increases with an increase in the space fractional parameter γ. For a different stress fractional parameter α, the viscoelastic fluid will exhibit viscous or elastic behavior, respectively. Furthermore, the numerical method in this study is validated and can be extended to other time-space fractional boundary layer models.


2014 ◽  
Vol 552 ◽  
pp. 240-243 ◽  
Author(s):  
Shuo Wang ◽  
Xiao Han ◽  
Qian Wang

An urban intersection group consists of a set of intersections which are geographically adjacent and strongly correlated with each other. It is an effective way to relieve traffic congestion in the networks to set the key intersection of the road network as the core, radiate outward to find the scale of its influence and divide the intersections into groups according to their relevance. Determining intersections group is the fundament of improving traffic control. Therefore, analyzing the associated features of intersections group and the research method of determining the scope of intersection group to ensure the compatibility of "time", " space" and "traffic flow", is of high research value and practical significance[1]. This paper focuses on operating characteristics of adjacent intersections with factor (CF) as indicators of the value of the associated metric of the adjacent sections and developing dynamic partitioning intersection group program in VISSIM, and take the road network near Guangzhou Road as example.


2012 ◽  
Vol 18 (5) ◽  
pp. 744-751 ◽  
Author(s):  
Zora Mistríková ◽  
Norbert Jendželovský

The paper presents analyses of deformations and stress of the circular rotationally symmetric tanks. The reinforced concrete tanks – water reservoirs – resting on elastic subsoil have been analyzed. The elastic subsoil has been modeled using three basic subsoil models: half-space model, two-parametric model and one-parametric (Winkler) subsoil model. Particular modifications have been applied to the basic models which yield in seven models presented. The cylindrical tank has been analyzed in the interaction with the subsoil, while the elastic subsoil has been characterized by different parameters. The differences in modeling using individual calculation models have been highlighted. The results from analytical and numerical solutions have been presented and compared in graphs and tables. The method for the calculation of settlement of the circular foundation plate was verified experimentally. The settlement of the circular plate was measured while the silo was fully loaded by its contents. The experimentally obtained values have been compared with the calculation results. In the conclusion the recommendations for the suitable model subsoil for these types of structures have been presented.


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