نتایج جستجو برای: generally changes due to anthropogenic causes eg nutrients
تعداد نتایج: 10819194 فیلتر نتایج به سال:
in recent years, the topic of desertification has been discussed in different ways in scientific areas. this event occurred globally, regionally and nationally and many steps were taken to stop it. desertification is challenged universally and its destructive effects are unavoidable and its consequences do endanger the life of inhabitants. the identification of sensitive regions and prevention ...
The bioavailability of nutrients in sediments is one of the most important factors controlling ecological and physiological processes in the mangrove ecosystem (Alongi et al. 2002; Feller et al. 2002; Cheeseman & Lovelock 2004; Krauss et al. 2008). Although mangroves are highly productive, they are generally nutrient-deficient, relying on microbial and plant cycling processes for nutrients (Hol...
occurances of cyanobacterial bloom typically appear in eutrophic lakes which either have been affected by anthropogenic nutrient loading or are naturally rich in nutrients. microcystis blooms have been reported all over the world in freshwater ecosystems mainly due to increased population which results in increased the waste water production. the aim of this study was to recognize the basic re...
Abstract Extreme surface ocean waves are often primary drivers of coastal flooding and erosion over various time scales. Hence, understanding future changes in extreme wave events owing to global warming is socio-economic environmental significance. However, our current knowledge potential high-frequency (defined here as having return periods less than 1 year) largely unknown, despite being str...
with the growth of more humanistic approaches towards teaching foreign languages, more emphasis has been put on learners’ feelings, emotions and individual differences. one of the issues in teaching and learning english as a foreign language is demotivation. the purpose of this study was to investigate the relationship between the components of language learning strategies, optimism, duration o...
copper extraction from heap 3 low grade ore at sarchechmeh is limited due to its mixed composition (copper oxide and sulphide minerals). changing this heap to a bioheap could improve the copper recovery.
abstract in first part of this project, the use of a new and biguanid-like catalyst supported on silica as a recyclable catalyst provides a new route for the synthesis of a variety of arylalkylidene rhodanine derivatives through knoevenagle reaction in at present of solvent at room temperature. rhodanine derivatives and especially arylalkylidene rhodanines have proven to be attractive compound...
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