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Zero Emission Production for Conservation of Water Environment
FUJIE, Koichi 嶺南大學校 環境問題硏究所 1999 環境硏究 Vol.18 No.2
AbstractsThis paper aims to give basic information for the minimization of pollution load to environment by reducing wastewater discharge from production process and by selecting appropriate wastewater treatment processes based on characteristic evaluation of both treatment processes and that of wastewaters. Strategies and methodologies to analyze emissions from the production processes to reduce those by refining and/or replacing the unit process with the alternatives are introduced as well. It was stressed that taking materials and energy balances of the production process are the essential to clarify emissions quantitatively for the reduction of pollutants in the focused process. A procedure including biological degradability, activated carbon adsorption, chemical oxidation for mineralization and for improvement of biodegradability of pollutants, coagulation, and so on, was proposed to evaluate wastewaters for appropriate selection of treatment processes.
APPROPRIATE SELECTION AND OPTIMIZATION OF BIOLOGICAL WASTEWATER TREATMENT PROCESSES
FUJIE,Koichi 嶺南大學校 環境問題硏究所 1994 環境硏究 Vol.14 No.1
Characteristics of aerobic biological wastewater treatment processes, such as activated sludge process, trickling filter process, rotating biological contactor, land application and so on, was studied from view points of the power economy, which is defined as the amount of BOD removed per unit power consumption, and the rate of BOD removal per unit floor area of each process. Effects of the operating conditions and the configurations of the process on their performance were clarified for the appropriate selections and their operating conditions to give a high power economy and to maintain a high quality effluent as well.
Fujie,Koichi,Okada,Mitumasa,Kawashima,Hiroyuki,Okazaki,Minoru 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
A hollow fiber microfiltration (HMF) membrane featured an unique air-backwashing and a high filtrate flux under a low pressure and a low cross flow rate was successfully incorporated with the aerobic submerged biofilters for the advanced treatment of domestic wastewater. HMF system A in which the wastewater filtrated directly by the HMF membrane was treated by the aerobic submerged biofilter and HMF system B in which the moving bed aerobic biofilter (MBF) was followed by the HMF were proposed and were investigated in terms of the filtrate fluxe, the organic removal, the power consumption and the running cost based on the experimental results. The running cost was comparable with the conventional activated sludge process, whereas the effluent quality was superior than that.
ZERO-EMISSION MATERIALS CYCLE IN PRODUCTION PROCESS AND REGIONAL SCALE
FUJIE, Koichi The Korean Society of Clean Technology 1997 청정기술 Vol.3 No.2
The present paper aims to give basic information to establish zero emission material cycle including the minimization of emissions from industrial production processes and the area in regional scale. Strategies and methodologies to analyze emissions from the production processes and our human activities and to reduce those emissions by refining and/or replacing the unit process with the alternatives are introduced as well. Quantitative evaluation and management systems of any raw materials and the production process are from vie points of treatment are essential. Estabiishment of a process networking for the recycle of discharged non-products materials by the intra-process, trans-process and the trans-industries are proposed. Procedures and priorities to formulate industrial and regional zero emission system are proposed as well.
On the Motion of the Structure Varying Multibody Systems with Two-Dimensional Dry Friction
Fujie Xia,Peter Wolfs,Colin Cole 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.4
In the present paper the dynamics of the structure varying multibody systems caused by stick-slip motion with two-dimensional dry friction are analyzed. The methods to determine friction force both in stick and slip states are described. The direct method of considering the wagon bogie system as a structure varying system was used to consider two dimensional friction at the wheelset-side frame connection. The concept of friction direction angle used to determine the friction force components of two-dimensional dry friction both in the stick and slip motion states was used. A speed depended friction coefficient was used and described approximately by hyperbolic secant function. All switch conditions were derived and friction forces both for stick and slip states. Some simulation results are provided.
Ductile crack initiation evaluation in stiffened steel bridge piers under cyclic loading
Wataru Fujie,Miki Taguchi,Lan Kang,Hanbin Ge,Bin Xu 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.4
Although detailed shell analysis is suitable to predict the ductile crack initiation life of steel members, such detailed method adds time expense and complexity. In order to simply predict the ductile crack initiation life of stiffened steel bridge piers, a total of 33 cases are simulated to carry out the parametric analyses. In the analysis, the effects of the width-to-thickness ratio, slenderness ratio, plate thickness and so on are considered. Both shell analyses and beam analyses about these 33 cases are conducted. The plastic strain and damage index obtained from shell and beam analyses are compared. The modified factor βs is determined based on the predicted results obtained from both shell and beam analyses in order to simulate the strain concentration at the base corner of the steel bridge piers. Finally, three experimental results are employed to verify the validity of the proposed method in this study.
On the Motion of the Structure Varying Multibody Systems with Two-Dimensional Dry Friction
Xie Fujie,Wolfs Peter,Cole Colin The Korean Society of Mechanical Engineers 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.4
In the present paper the dynamics of the structure varying multibody systems caused by stick-slip motion with two-dimensional dry friction are analyzed. The methods to determine friction force both in stick and slip states are described. The direct method of considering the wagon bogie system as a structure varying system was used to consider two dimensional friction at the wheelset-side frame connection. The concept of friction direction angle used to determine the friction force components of two-dimensional dry friction both in the stick and slip motion states was used. A speed depended friction coefficient was used and described approximately by hyperbolic secant function. All switch conditions were derived and friction forces both for stick and slip states. Some simulation results are provided.