• Clean Technology
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• v.2 no.1
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• pp.7-21
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• 1996

• Clean Technology
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• v.2 no.2
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• pp.126-139
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• 1996

• Clean Technology
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• v.2 no.2
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• pp.142-147
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• 1996

• Clean Technology
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• v.2 no.2
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• pp.60-84
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• 1996

• Clean Technology
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• v.2 no.2
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• pp.15-29
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• 1996

• Clean Technology
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• v.2 no.2
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• pp.150-164
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• 1996

• Clean Technology
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• v.1 no.1
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• pp.67-79
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• 1995

• Clean Technology
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• v.1 no.1
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• pp.28-33
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• 1995

• Journal of the Korean Mathematical Society
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• v.47 no.2
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• pp.247-261
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• 2010

An associative ring R with identity is called a clean ring if every element of R is the sum of a unit and an idempotent. In this paper, we introduce the concept of f-clean rings. We study various properties of f-clean rings. Let C = $\(\array{A\;V\\W\;B}\)$ be a Morita Context ring. We determine conditions under which the ring C is f-clean. Moreover, we introduce the concept of rings having many full elements. We investigate characterizations of this kind of rings and show that rings having many full elements are closed under matrix rings and Morita Context rings.

• Clean Technology
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• v.18 no.1
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• pp.22-30
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• 2012

Separation of $SO_2$ from the flue gases of fossil fuel power plants are important issue because of its strong environmental impact. Industrially, $SO_2$ is being removed with a slurry of limestone, lime or aqueous caustic soda. However, these scrubbing processes possess several drawbacks such as the generation of huge amount of wastewater and the production of metal salts. Recently, ionic liquids have gained increasing interest as an absorbent for acid gas, $CO_2$ and $SO_2$. In this review, we have introduced the recent progress of ionic liquids as a $SO_2$ absorbent.