نتایج جستجو برای: and water quality as environmental indicators
تعداد نتایج: 17551394 فیلتر نتایج به سال:
Qualitative status of the environment is signaled by a group of indicators, known as bioindicators, several of which are responsible for showing progressive impacts of different types of pollutants. Having addressed the influence of various bioindicators in environmental pollution, it has been revealed that bioindicators are sensitive to any disturbance in any environment. With regards to the p...
the community dynamics of aquatic coleoptera(insecta)in one of the spring-stream habitats of bammo national park in fars province called cheshmeh-ye-ghanbari is studied as a pilot project and model for acquaintance with and furthering the biodiversity studies on fauna of iran. sixteen species-populations out of nineteen of this community were already identified for their taxonomy and for thei...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
The stream functioning is closely influenced by land uses, along the stream itself and throughout the catchment. Land uses can be seen as both the expression of the natural environment and the result of increasing human activities. Land uses generate various (in kind and intensity) pressures (positive or negative) that alter river water quality at different scales of time and space. The objecti...
Marginalization is one of the consequences of economic and social crises in Iran during recent years, which has caused many problems on the margin of large cities such as Tehran. Lack of living standards, as well as urban management supervision, have caused environmental problems to be one of the damages of these areas to its inhabitants and surrounding urban areas. Environmental degradations i...
Water as one of the most essential natural elements of landscape and consequently urban landscape from yesterday till today has had a great impact on the formation and effectiveness of urban spaces and its various effects have always stimulated human tendency towards beauty. It should be noted that the existential values of water are not merely aesthetic, rather it goes back to the deepest an...
Environmental health inequalities (EHIs) refer to general differences in environmental health conditions. This research aimed at introducing the EHI indicators and providing general recommendations that could improve environmental health and reduce the inequalities observed.This research is the review of WHO reports in various regions. A set of 14 EHI indicators was developed and categorized in...
one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...
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