Nowadays, a noticeable part of the relations among the states turn around the environment protection. Therefore, the right for ever-creasing use of the existing resources of this inland sea cannot be exclusive to any Caspian State and the aftermath involves all countries of this basin. In this respect, agreement on political border and boundaries with the Caspian Sea?s ecosystem is a difficul...

The calculation of pollution mass balances is explained with reference to modelling indoor air quality in museums, and the implication of pollution deposition on building interior and museum objects is discussed. A short overview of the museum environments key pollutants and their effect on materials are given. Case studies, which compare buildings with and without air-filtration, old and new b...

Elevated CO2 and nitrogen (N) addition directly affect plant productivity and the mechanisms that allow tidal marshes to maintain a constant elevation relative to sea level, but it remains unknown how these global change drivers modify marsh plant response to sea level rise. Here we manipulated factorial combinations of CO2 concentration (two levels), N availability (two levels) and relative se...

The largest city of Bulgaria – the capital Sofia (1,2 million inhabitants) is located in a broad valley at 550 m a.s.l. (above sea level) and the second largest town is Plovdiv at the Maritza river. Other major towns are located at the Black-sea cost (Varna and Bourgas), and there are a number of smaller towns in mountainous regions. Local circulation systems are therefore significant for the a...

In recent years there has been a significant increase in the development and application of ever more sophisticated multi-dimensional models for solving the hydrodynamic and constituent transport equations which govern the flushing of pollution. However, advanced numerical modelling techniques can sometimes be augmented by alternative mathematical approaches which use simplified analytical solu...