The key nodes and main factors influencing accumulation of soil arsenic in Pteris vittata L. under field conditions

Subject. This article examines the issues related to changes in reproduction capacity and heterogeneity of the development of Russian regions. Objectives. The article aims to assess regional differentiation and investigate the main factors influencing the uneven development of the areas. Methods. For the study, we used the methods of comparative and correlation analyses. Results. The article identifies groups of leading and lagging Russian regions and assesses the possibility of convergence of Russian regions according to the analyzed indicators, such as GRP, GRP per capita, and the output of industry. Conclusions. The results obtained can be used when preparing strategic policy documents, spatial development programmes and concepts. The observed heterogeneity suggests that the regions maintain their positions throughout the research period.

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Polymer composites as sensing materials for liquid organic solvents – preliminary results

e-Polymers ◽

10.1515/epoly.2011.11.1.362 ◽

2011 ◽

Vol 11 (1) ◽

Cited By ~ 1

Author(s):

Stanislaw Frackowiak ◽

Monika Maciejewska ◽

Andrzej Szczurek ◽

Marek Kozlowski

Keyword(s):

Electrical Resistivity ◽

Carbon Black ◽

Polymer Composites ◽

Percolation Theory ◽

Liquid Mixtures ◽

Organic Liquids ◽

Volumetric Fraction ◽

Factors Influencing ◽

Benzene Toluene ◽

Main Factors

AbstractCarbon black-filled polymer composites were investigated as sensing materials for organic liquids. Polypropylene and polystyrene which were selected as matrices and various amounts of carbon black were considered as the main factors influencing sensitivity of the composites in view of the percolation theory. Disposable filaments were produced of these materials. Change in their electrical resistivity was measured upon immersion in benzene, toluene, xylene, ethylbenzene and their mixtures. It has been found that studied materials were sensitive to the composition of liquid mixtures of organic solvent. Relationships between the filament response and volumetric fraction of the components were presented. The studied materials have shown promising sensing properties, which suggest their applicability for identification and quantification of multicomponent organic liquids.

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Micro-distribution of arsenic and polycyclic aromatic hydrocarbons and their interaction in Pteris vittata L

Environmental Pollution ◽

10.1016/j.envpol.2021.117250 ◽

2021 ◽

pp. 117250

Author(s):

Xiao-Yong Liao ◽

Xue-Gang Gong ◽

Li-Li Zhang ◽

Daniel P. Cassidy

Keyword(s):

Polycyclic Aromatic Hydrocarbons ◽

Aromatic Hydrocarbons ◽

Pteris Vittata ◽

Polycyclic Aromatic ◽

Pteris Vittata L

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Factors Influencing Saudi Parents’ Choice of International Schools in Saudi Arabia

Journal of Research in International Education ◽

10.1177/1475240920976259 ◽

2020 ◽

Vol 19 (3) ◽

pp. 220-232

Author(s):

Hamdah Abdullah Alfaraidy

Keyword(s):

Socioeconomic Status ◽

International Education ◽

School Quality ◽

International Schools ◽

Traditional Schools ◽

Ministry Of Education ◽

Public And Private ◽

Mandated Curriculum ◽

Factors Influencing ◽

Main Factors

The Saudi Ministry of Education has recently begun to allow all Saudi families to enroll their children in international schools. The international curriculum offered by such schools represents a notably different choice compared with Saudi traditional public and private schools, both of which teach the same state-mandated curriculum. As a result of the change, there has been a surge in demand for international education; the number of schools has increased rapidly, and there has been a steady “student leak” towards them and away from traditional schools. Little is known about why Saudi parents choose to enroll their children in international schools. We explored this question by surveying 431 Saudi parents of children attending such schools to identify the main factors contributing to their choice. Although all factors examined were important to parents, curriculum and overall school quality emerged as the most important; socioeconomic status was not influential in their decisions.

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Implementation Constraints on Israel–Palestine Water Cooperation: An Analysis Using the Water Governance Assessment Framework

Water ◽

10.3390/w13050620 ◽

2021 ◽

Vol 13 (5) ◽

pp. 620

Author(s):

Liping Dai

Keyword(s):

Water Governance ◽

Political Environment ◽

Assessment Framework ◽

Foreseeable Future ◽

Current Technology ◽

Factors Influencing ◽

Water Cooperation ◽

Main Factors ◽

Enforcement Mechanisms ◽

Business As Usual

This study uses a diagnostic and multidisciplinary water governance assessment framework to examine the main factors influencing water cooperation on the shared Mountain Aquifer between Israel and Palestine. It finds that effective cooperation between Israel and Palestine is unlikely in the foreseeable future if both parties persist with the business-as-usual approach. What constrains the two parties from achieving consensual agreement are political tensions, the constraints of current technology, the different perceptions of the value of the shared water, the mistrust between the two parties, the lack of external enforcement mechanisms, and the impacts of the domestic political environment.

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