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하수종말처리장의 인 처리시설에 티탄염 응집제 적용 및 슬러지 재활용
김종호 ( Jong Ho Kim ),김종범 ( Jong Beom Kim ),박희주 ( Hee Ju Park ),이기원 ( Ki Won Lee ),조아라 ( A Ra Jo ),김명완 ( Myung Wan Kim ),이영준 ( Young Jun Lee ),박세민 ( Se Min Park ),이광영 ( Kwang Young Lee ),손호경 ( Ho Kyong 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
As the regulation of total phosphorus (T-P) concentration in biologically treated sewage effluent is reduced to 0.2~2 mg/L, flocculation process is recommended to remove T-P. In this study, the performance of Tisalt coagulant was investigated in terms of dosage and pH in removing phosphorus and the collected sludge after Ti-salt flocculation was calcined to produce titania for effective sludge recycling. The flocculation performance was carried out using two methods: sedimentation and air floatation. Both methods were feasible to apply for Tisalt flocculation. Ti-salt flocculation was effective in reducing phosphorus concentration in sewage effluent, which showed similar performance of alum (Al2(SO4)3). The calcined sludge was recycled to titania which is the widely used metal oxide. Titania produed from Ti-salt sludge indicated similar charateristics of commercially-available P- 25 in regard to photocatalytic activity and surface area. Therefore, this can be easily adopted to titania application by replacing P-25.
김종호 ( Jong Ho Kim ),( Saravanamuthu Vigneswaran ),( Jaya Kandasamy ),손호경 ( Ho Kyong Shon ),김종범 ( Jong Beom Kim ) 한국공업화학회 2011 공업화학 Vol.22 No.1
물은 인간에게 가장 소중한 자원이지만 여러 유기물에 의해 오염되어 있다. 이러한 유기물은 인간과 환경에 큰 영향을 끼칠 수 있으므로 물 속 유기물의 특성 분석이 중요하다. 본 총설에서는 물 속 유기물의 자세한 분석 방법과 특성을 고찰하였다. 각 유기물의 물리적, 화학적, 생물학적면에 의거하여 전통적인 방법과 고도 특성 분석을 정리하였다. Water is the most precious resource to human being, but it is polluted by different organic compounds. Organic matter (OM) in aqeous solutions is one of the important parameters of concern for human and environmental impact, and thus, it is essential to better characterize specifically targeted organic matter in aggregated and individual level of concentrations. This review presents different analytical tools and protocols to investigate detailed properties and characterization. Physical, chemical and biological aspects of OM are envisaged in terms of traditional and advanced measurement methods.
輸出增大를 위한 中小企業의 近代化 方案 : 開發途上 國家에 있어서의
孫鎬經 명지대학교 1971 明大論文集 Vol.4 No.-
It is admitedly known that our country is one of the most rapidly developing economics over the world. The rapidly developing economy implies the one in which the investment rate per year exceeds the growth rate of income. If a nation has plunged into a stage of high growth by moving from tradition steadiness to transition and resulted in higher investment rate than the income growth, every aspects of industries begins to change, especially in the structure of industries and in the growth rate of every industry. According to H.B. chenery, the main reason that brings the changes in industrial structure and growth rate to the industrial society in the process of rapid economic growth is the income amplification. But Eugene Staly and Richard Morse who research at the Standford Research Institute, point more sensibly and more concretly the forces that moderate the trend toward bigness and, in some circumstances, give the competitive advantage to small and medium plants as follows: (1) physical and engineering relationships, (2) products in which skilled labour or high precision are critical, (3) mass production of specialized components or end items, (4) products made in small lots and short runs, (5) locational factors and transfer costs, (6) technical excellence in design or innovation in the speclized products, (7) personal relations in the small firm, (8) operating flexibility and lower overheads, (9) selling services, (10) rapid response to growth opportunities. This classification of reasons by Staley and Morse cuts the both ways. In the process of developing economy the small and medium industries can complement the large industries if they accomodate and grow harmoniously throuh the behalf of the above forces. And the small and medium industries, therefore, can enhances the efficiencies of the economy as the result of the missing complement, and can also give higher competitiveness to the economy internationlly. But if they accomdate unfittingly, both themselves and large industries are bound to frustrate in and out. What are the measures that the small and medium industries could be given the appropriate opportunities for accomodations and growth for meeting the higher developing pace. For the purpose of answer, this study have developed the arguement in three stages: First, the method that can specify the approprate and indispensable types of small and medium industries in the developing economy. As the methods of specification three method are suggested; (1) statistical and inductive method, (2) technoeconomic method, (3) historical and developmental stages mothod. Second, the standard criteria of the choices of investment, products and technique that the types of small and medium industries must adhere to in the developing process. Finally the developmental measures the development planners, administrator, technical assistance expert, or business leader are supposed to apply to aid the small and medium industries in developing economy, through promoting efficiency, adaptation to new cirsumstances, growth and international competitiveness of the industries, and through enhancement of complement between the large industries and small medium industries. For the final measures this study summarizes the methods as follows (a) Ways of increasing the number of efficient entrepreneur-managers. (b) Developmental facilities for small an medium industries aid. (c) Development finance. It is needless to say that the small and medium industries can achieve the abilities to accomodation and international competitiveness in the goings of the economy's high rate development.