ammonium ions wastewater pollution has become one of the most serious environmental problems today. the treatment of ammonium ions is a special concern due to their recalcitrance and persistence in the environment. in recent years, various methods for ammonium ion removal from wastewater have been extensively studied. this paper reviews the current methods that have been used to treat ammonium ...

In simple vacuum systems employing a' single ion pump, it is common to use the linear pump current pressure relationship to advantage, eliminating the need for a separate vacuum gauge by reading the ion pump power supply current. In large systems it becomes prohibitively expensive to install a power supply for each pump and in such systems one or more central supplies are usually used with a di...

Natural indicators of the electrical polarity of a direct current (DC) source is limited to semiconductor based diodes and transistors. Recently a novel bio-natural indicator of the polarity of a DC source have been reported. Mimosa Pudica or sensitive plant is found to be a natural detector of a DC source polarity, however the mechanism underlying this phenomenon is not known. This paper aims ...