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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.
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.
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.
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.
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.
( Shinya Fujie ),( Hirotoshi Ishiwatari ),( Keiko Sasaki Junya Sato ),( Hiroyuki Matsubayashi ),( Masao Yoshida ),( Sayo Ito ),( Noboru Kawata ),( Kenichiro Imai ),( Naomi Kakushima ),( Kohei Takizawa 대한간학회 2019 Gut and Liver Vol.13 No.3
Background/Aims: To compare the diagnostic yield of 20-gauge forward-bevel core biopsy needle (CBN) and 22-gauge needle for endoscopic ultrasound (EUS)-guided fine needle aspiration (FNA) of solid pancreatic masses. Methods: The use of 20-gauge CBN was prospectively evaluated for 50 patients who underwent EUS-FNA from June 2016 to December 2016. Data were compared with those obtained by a retrospective study of 50 consecutive patients who underwent EUS-FNA using standard 22-gauge needles between December 2016 and April 2017. At least two punctures were performed for each patient; the sample from the first pass was used for cytology with or without histology and that from the second pass was used for histology. Sample quantity was evaluated using the sample obtained from the second pass. Results: There was no significant difference in the diagnostic accuracy rate between the first and second passes (20-gauge CBN: 96% [48/50]; standard 22-gauge needle: 88% [44/50]). Samples >10× power fields in length were obtained from 90% (43/48) and 60% (30/50) of patients using the 20-gauge CBN and standard 22-gauge needle, respectively (p=0.01). Technical failure occurred for two patients with the 20-gauge CBN. Conclusions: Diagnostic accuracy of the 20-gauge CBN was comparable to that of the 22-gauge needle. However, two passes with the 20-gauge CBN yielded a correct diagnosis for 100% of patients when technically feasible. Moreover, the 20-gauge CBN yielded core tissue for 90% patients, which was a performance superior to that of the 22-gauge needle. (Gut Liver 2019;13:349-355)