Application of Separation Technology to Waste Water Treatment

We have various kinds of separation methods for aqueous solution, such as solvent extraction,ion exchange resin, adsorption method, etc. They are applicable to the treatment of waste water discharged in various industries. The important thing is how they can be combined for the suitable purpose

Effects of exchange temperature on properties in field-assisted ion-exchanged glass

In situ strain measurements were performed during field-assisted ion-exchange processes at high (380(DEGREES)C) and low temperatures (290(DEGREES)C). Results of strain measurements confirmed that the residual stress in field-assisted ion-exchanged glasses depended on the ion exchange temperature. Measured strain data indicated that structural relaxation of the parent glass occurred during the field-assisted ion exchange;The stresses in a mixed-alkali-ion layer in doubly ion-exchanged glass were dependent on the ion-exchange temperature and the ratio of the integrated flux of alkali ions in the second ion-exchange process to the one in the first ion-exchange process. It was found that the mixed-alkali-ion layer was not a thermo-rheologically simple material;A viscoelastic model for field-assisted ion-exchanged glass was proposed based on the known residual-stress data for both singly and doubly ion-exchanged glass and on the strain data. The governing viscoelastic stress-strain equations for a field-assisted ion-exchanged glass tube were solved numerically by iterative finite-difference techniques

Current Status of Recycling of WEEE in Korea

Recently, the amount of Waste Electrical and Electronic Equipment (WEEE) in Korea has greatly been increasing, as well as that from manufacturing sites. At an early stage, the driving force for the recycling of WEEE was the reclamation of precious metals such as gold, silver, plat-inum and palladium. However, the profitability of recycl-ing diminishes as the amount of noble metals contained in each individual piece of equipment decreases, thus requir-ing more efficient recycling technology. Moreover, WEEE has been accompanied by environmental problems. In 2003, the Korean government introduced the Extended Producer Responsibility (EPR) Program for personal computers and white-goods appliances such as TVs, washers, refrigerators and air conditioners. The program is scheduled to extend to cellular phones and audio equipment from 2005. However, the lack of recycling technology is expected to inhibit the success of the program. Realizing this, Korea Insti-tute of Geoscience & Mineral Resources (KIGAM) has endea-vored to develop WEEE recycling technology under a gove-rnment-sponsored 1D year project. This presentation will introduce the present status of the recycling of WEEE in Korea and the activities of KIGAM on this subject

Non-market Leadership Experience and Labor Market Success : Evidence From Military Rank

There has been much recent interest in the effects of pre and non-market skills on future labor market outcomes. This paper examines one such effect : the effect on future wages of military leadership experience among "Vietnam generation" American men. We study rank, not just veteran status. We argue that rank is a good measure of pre-market leadership skills because of the clear military hierarchy and the primarily youth experience of Vietnam service. Two sources of selection bias are accounted for : non-random military entry and eventual rank attained. We apply a modified 2-stage parametric sample selection method. The rank premia on future wages are estimated using the parametric selection corrections and a propensity score matching with two indices. We find evidence of a leadership premium, but not a veterans' premium. It is the rank that matters. If one joins the military believing that military service commands a future wage premium, he had better become an NCO or an officer.non-market skills, military, future wages, parametric sample selection