نتایج جستجو برای: calcareous composition
تعداد نتایج: 262943 فیلتر نتایج به سال:
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cadmium (cd) concentration in soil solution and its bioavailability is controlled by sorption-desorption reactions. the objective of this research was to compare cd adsorption behavior in six calcareous and four acid soils. soil samples were equilibrated with 0.01 m ca(no3)2 containing 25 to 3200 mg cd l−1. results showed that the tendency for adsorption was high at low cd concentrations (0-400...
این پایان نامه در سه فصل نوشته شده است، در فصل اول تعاریف و قضایای لازم برای فصل های دوم و سوم بیان شده است. فصل دوم به بررسی عملگرهای ترکیبی وزن دار روی فضاهای توابع اندازه پذیر اختصاصداده شده است. فصل سوم که در واقع اصلی ترین فصل پایان نامه است به بیان نرم اساسی عملگر ترکیبی روی فضاهای ارلیز می پردازد. این پایان نامه بر اساس مقالات زیر تدوین گردیده است: • m. r. jabarzadeh the essential...
The presence of large amounts of calcium in the equilibrium system of calcareous soils of arid and semi-arid regions affects the chemical reactions of soluble and exchangeable phases. Exchange phenomenon is one of these chemical reactions in which calcium plays an important role. K-Ca equilibria are important equilibria in calcareous soils and may be an answer to many problems in soil chemistry...
Abstract In mountains, current land-use changes are altering plant communities of semi-natural grasslands with potential cascading effects on associated herbivores. Besides vegetation changes, temperature is also a key driver insect diversity, and in the European Alps predicted to increase by 0.25 °C per decade. Understanding herbivore responses composition mountain environments increasing impo...
Zinc oxide (ZnO) nanoparticles may provide a more soluble and plant available source of Zn in Zn fertilizers due to their greater reactivity compared to equivalent micron- or millimetre-sized (bulk) particles. However, the effect of soil on solubility, spatial distribution and speciation of ZnO nanoparticles has not yet been investigated. In this study, we examined the diffusion and solid phase...
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