there are many trends in making an ecological city all around the word, one of important cases in this approach is safe and health water. according by definitions, safe and potable water is water needed for conducting the activities of man. potable water is the most important renewable sources and this resource plays important role for survival of most living organisms as well as man based on s...

the city is alive with dynamic systems, where parks and urban green spaces have high strategic importance which help to improve living conditions. urban parks are used as visual landscape with so many benefits such as reducing stress, reducing air pollution and producing oxygen, creating opportunities for people to participate in physical activities, optimal environment for children and decreas...

This paper argues that the most important aspect of central bank transparency is communication about the future path of the policy rate. Despite great progress on transparency, communication on this topic remains shrouded in an obscure code. Central banks can enhance transparency by providing, in decreasing order of importance: i) an unconditional forecast of the policy interest rate; ii) an un...

organotin compound that have at least one sn-c bond have wide commercial applications as pvc stabilizer, antifouling agent in paint and as agrochemicals. the general formula for organotin compounds is r4snx4 - n where r is normally alkyl or aryl groups and x=cl-, oh-, ch3coo- . if n=3, the compound has the highest toxicity, for example et3snoac has ld 50 4mg/kg ( rats ) and this is the most tox...

All living organisms are exposed to ionizing radiation comprising cosmic rays coming from outer space, terrestrial nuclides occurring in the earth’s crust, building materials, air, water and foods and in the human body itself. The exposures are constant and uniform for all individuals everywhere including the dose from ingestion of 40K in food. Cosmic rays are, more intense at higher alt...

built environment does not “simply appear overnight, like a movie-set springing up on a vacant lot, but has to be produced”.thus, the first point in dealing with such an environment is considered to be the tracing of time in the evaluation of the city and keeping in mind that the whole is more than its parts. the last point becomes naturally understood when the process of city building is p...