检索结果-南通市图书馆

migration characteristics and profile control capabilities of preformed particle gel in porous media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum 2022年第4期8卷 483-498页

作者： Nanjun Lai Shufang Chen Lei Tang Yuaojie Huang Hongwei Xu School of Chemistry and Chemical Engineering Southwest Petroleum UniversityChengdu610500China

Inspired by the viscoelastic displacement theory,a product called preformed particle gel(PPG)is developed as conformance control agent to enhance oil recovery and control excess water *** migration law of PPG suspension in porous media is related to its deep profile control and displacement *** experiments indicate that PPG suspension has good viscosity increasing,and the apparent viscosity decreases with the increase of shear *** suspension is mainly elastic,and its network structure makes it have certain shear *** particles realize migration in porous media in the way of“accumulation and blockage/pressure increase/deformation and migration”.When the ratio of the PPG particle size to the pore throat diameter d ranges from 35.52 to 53.38,the particles can match through the porous *** the permeability difference of the parallel model is 5,PPG suspension has the highest profile improvement rate,69.10%.PPG suspension can adjust the planar heterogeneity,and increase the oil recovery rate by 20.75%.The PPG suspension can effectively start“cluster"、“film”and“blind end residual oil”,and has a high oil washing *** core NMR T2 spectrum shows that PPG suspension mainly reduces oil saturation in mesopores and *** PPG flooding,the EOR capacity of small pores is the highest,39.11%.

关键词： Preformed particle gel(PPG) migration law Profile control Flow characteristics Microscopic oil displacement

Juridical Status and Rights of Irregular Migrants in Brazil and Italy： An International Comparative Perspective

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sociology Study 2013年第7期3卷 502-514页

作者： Sofia Ciuffoletti Adriana Dias Vieira University of Florence Italy (Sofia Ciuffoletti has developed the Italian paradigm and the conclusion) Federal University of Paraiba Brazil (Adriana Dias Vieira has developed the Brazilian paradigm and the conclusion)

The aim of this paper is to analyse the legal status of irregular migrants, both in Brazil and in Italy, from a comparative law perspective. Irregular migration has always been a sensitive issue in Italian politics and is going to be a core-issue in a time of economic crisis, while in Brazil the current wave of international migration is regarded as a new phenomenon, resulting from the recent economic growth. From a legal standpoint, this study provides an analysis of both national legal order and the jurisprudential trends issued by the Inter-American Court of Human Rights （IACtHR） and the European Court of Human Rights （ECtHR）, specifically underlining the judicial borrowing and interaction between the two courts.

关键词： migration law irregular migration judicial borrowing comparative law

Analysis of impact of outfalls on surrounding soil and groundwater environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Groundwater Science and Engineering 2014年第3期2卷 54-60页

作者： GU Ming-xu LIU Yu HAN Chong SHANG Lin-qun JIANG Xian-qiao WANG Lin-ying Environmental Geology Prospecting Institute of Hebei Province

With certain outfalls in Baoding as an example and in combination with test results of soil and water samples taken from both sides of such outfalls,the organic contamination compounds influence on the surrounding soil and groundwater environment was analysed,the distribution features of the main organic contamination in soil and groundwater in different depth were discussed,and the vertical and longitudinal migration rule of all kinds of main organic contamination compounds in soil and groundwater in the sewage irrigation area was studied.

关键词： Outfall Organic contamination Vadose zone Contamination characteristics migration law

Study on the migration Mechanism of Typical Characteristic Pollutants in Coking Enterprises

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2022年第3期13卷 86-90页

作者： Jun ZHOU Yan WANG Zhi CHEN Zhiqiang GONG Fan LI Ruihai DONG Ce ZHANG Tangshan International Tourism Island Branch of Tangshan Ecological Environment Bureau Tangshan 063015China Hebei Key Laboratory of Geological Resources and Environment Monitoring and Protection Hebei Geological Environmental Monitoring InstituteShijiazhuang 052460China

Groundwater pollution in north China is serious, which is mostly caused by complex factors. Aiming at the problems such as the unknown reasons for the differences in the migration characteristics of typical characteristic pollutants in the same medium and the unknown migration rules of complex pollutants in soil and groundwater, this paper selected a single sample and a mixed sample of typical characteristic pollutants in coking enterprises to carry out the static adsorption test. The results showed that the distribution coefficients of benzene series and aromatic hydrocarbon pollutants in soil-water were K_(d)benzene >K_(d)toluene >K_(d)ethylbenzene >K_(d)pyrene >K_(d)anthracene >K_(d)naphthene, and the distribution coefficients of ammonia nitrogen, phenols and cyanogen were K_(d)ammonia nitrogen >K_(d)phenols >K_(d)cyanogen. The overall distribution coefficient of benzene series was higher than that of PAHs, and it was easier to be adsorbed by silty loam. Different carbon and hydrogen mass and even electron distribution of typical characteristic pollutants led to differences in the migration characteristics of benzene and aromatic pollutants. The more carbon and hydrogen there were, the more even the electron distribution was, and the more difficult it was to migrate in the soil. Among the same kind of pollutants, the migration of complex pollutants was weaker than that of single pollutants. The research could provide the parameter basis for establishing the solute transport model of groundwater and the design basis for developing the related risk control and pollution prevention strategies.

关键词： Coking enterprises Characteristic pollutants migration law Distribution coefficient