Background: Radon as a potential risk of radiation exposure is a natural radioactive element that can emit from rocks and soils. Due to solubility in water, it can be inhaled or consumed by the public. The purpose of this study was carrying out measurement and evaluation of radon concentration in samples of drinking water which are collected from water supplies of Borujerd. Materials and Method...

The given paper deals with uninterruptible power supplies utilizing supercapacitors (ultracapacitors). Different types of supercapacitor are described. Various opportunities of supercapacitor implementation are discussed, pros and cons are compared. Experimental comparison of lead-acid battery with supercapacitor is done.

full adder cell is often placed in the critical path of other circuits. therefore it plays an important role in determining the entire performance of digital system. moreover, portable electronic systems rely on battery and low-power design is another concern. in conclusion it is a vital task to design high-performance and low-power full adder cells. since delay opposes against power consumptio...

The droop current sharing method is analyzed, and a general design procedure is proposed. It is shown that the current-sharing accuracy of N+1 power supplies is a function of the output-voltage set-point accuracy, the slope of the outputvoltage droop, and gains of the control loop. It was found that to achieve a current sharing accuracy of 10% the output voltage of the paralleled power supplies...

due to the increasing cost and environmental impacts of fossil fuel consumption, using the renewable energies in data center has become an important and essential priority. although using renewable energies has less environmental harmful effects, but the high investment needed for their installations as well as their fluctuating power production characteristic, restricts their usage such that m...