The reliability of innovative membrane contactors technology (i.e. Gas/Liquid Membrane Contactors, Membrane Distillation/Crystallization) is today increasing for seawater desalination processes, where traditional pressure-driven membrane separation units are routinely operated. Furthermore, conventional membrane operations can be integrated with membrane contactors in order to promote possible improvements in process efficiency, operational stability, environmental impact, water quality and cost. Seawater is the most abundant aqueous solution on the earth: the amount of dissolved salts covers about 3% of its composition, and six elements (Na, Mg, Ca, K, Cl, S) account for more than 90% of ionic species. Recent investigations on Membrane Distillation-Crystallization have shown the possibility to achieve significant overall water recovery factors, to limit the brine disposal problem, and to recover valuable salts (i.e. calcium sulphate, sodium chloride, magnesium sulphate) by combining this technology with conventional RO trains. In this work, the kinetics of CaSO4 ⋅ 2H2O, NaCl and MgSO4 ⋅7H2O crystallization is experimentally investigated in order to improve the design of the membrane-based crystallization unit.

The aim of this study is, by examining physical teachers' understanding of curriculum for managing advanced optional subjects of physical education, organizing and managing of the subjects, and the reality of class management and evaluation, to reflect pi

High Energy Milling (HEM) is applied for the grinding of cement and this can lead to substantial refinement (<2μm) and mechanically activation of the powder particles. The present paper reviews the preliminary studies, explains the novel technique and suggests the route into commercial application. Particular attention is paid to wear results with an applied unit where no substantial wear was found after 4000 h of operation.

The processes of P/M affect the properties of sintered gears. The different techniques of P/M lead to the different properties of sintered gears. This paper summarizes new progress in powder metallurgy for sintered gears. These progresses include warm compaction, high velocity compaction, sinter hardening, high temperature sintering, infiltration, CNC powder press and surface densification etc.

The 21st Century Frontier Program, which is one of the R&D programs funded by Korean government, was launched in 1999 to elevate the status of Korean science and engineering capabilities to the advanced nation in the strategic fields. Currently, 23 different fields of science and engineering programs are carried out by researchers in institutes, universities and industries. Center for Advanced Materials Processing (CAMP) was formulated in 2001 to develop the advanced materials as well as to improve the parts manufacturing process. The main role of CAMP is proposing and forecasting the long term vision in Materials Processing Technology and also supporting the project teams for their best performance in R&D. The CAMP program consists of 5 research areas such as, Multi-layer Ceramic Electronic Parts, Powder Formed Precision Parts, 3 Dimensional Polymer Based Composites, Functional Metal Sheets, Parts Integration Technology. An introduction of R & D activities at CAMP, specially focusing on powder metallurgy, will be presented.

The development of Fe-based metal matrix composites (MMCs) with high content of hard phase has been approached by combining the use of advanced powder metallurgy techniques like high-energy milling (HEM), cold isostatic pressing (CIP) and vacuum sinterings. A 30% vol. of NbC particles was mixed with Fe powder by HEM in a planetary mill during 10h, characteristing the powder by the observation of morphology and microstructure by scanning electron microscopy (SEM). After of sintering process the variation of density, hardness,carbon content and the microstructural changes observed, permits to find the optimal conditions of processing. Afterwards, a heat treatment study was performed to study the hardenability of the composite.

경수로 원자로 하부구조물에서 발생되는 유포의 불균일성에 기인하는 교차류와 핵연료집합체의 수력저항의 차이에 의해 발생하는 교차류, 그리고 축류 등에 의해 유발되는 연료봉의 불안정성은 핵연료손상의 원인이 될 수 있으므로, 새로운 연료 개발 시 연료봉에 대한 진동 및 안정성 해석을 수행하여 연료봉 진동과 불안정성 발생 여부를 확인하고 있다. 본 연구에서는 새로 개발된 고리 2호기용 형 개량핵연료 집합체에 대한 연료봉의 진동 및 안정성 해석을 수행하여 지지격자 높이와 위치, 그리고 지지조건 등이 연료봉의 진동특성 및 안정성에 미치는 영향을 평가하였다 그리고 해석결과에 근거하여 개량연료 집합체에서 중간지지격자 높이와 각 지지격자의 위치를 제안하였다.

The aim of the present study was to investigate the impact of two task-processing conditions (10 minutes of pre-task planning time and content familiarity of the task) on spoken performance in terms of the fluency, complexity, and accuracy in a narrative task. The subjects were 20 Korean undergraduate students with a high language proficiency. The results of the two-way interaction effect between the planning and familiarity of the MANOVA were significant in terms of pause length. The univariate test of familiarity in an unfamiliar condition for subordinate clauses in the MANOVA test was significant. The study also found a trade-off effect between complexity and accuracy in terms of the effects of planning time in planned and unfamiliar conditions. These results suggest that the performance of learners could be varied depending on the different combinations of task-processing conditions even in a single narrative task.

선진국일수록 서비스 산업의 비중이 큰 것은 주지의 사실이다 선진국 진입을 위해 진력하는 한국의 입장애서 신 진국 서비스 산업의 연구 및 정보는 긴요하다 이 연구는 세계 400 대 최량 기업들 중 서비스 기업들의 다양한 경영 업적들이 서비스 산업의 여러 분야와 그 하부 부문에서 어떻게 나타나고 있는지를 기술통계, 분산분석, 던칸 검정 등을 활용해 분석하였다 이로써 서비스 산업 분야에 대한 진입, 투자, 벤치마킹 등에 관해 활용할 수 있는 유의 한 결과들을