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Zone 연신 조건이 PVDF 필름의 압전성에 미치는 영향
김상용,최진환,설창,지병철,Kim, Sang-Yong,Choi, Jin-Whan,Seoul, Chang,Ji, Byung-Chul 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.5
Mechanical and piezoelectrical properties of zone-draw poly(vinylidene fluoride) films were studied. Effects of draw ratio and drawing temperature on the mechanical and piezoelectrical behavior were investigated and they were compared with those of hot-drawn films. As draw ratio increases so does the piezoelectric strain constant, but the increase of piezolectric strain constant of zone-drawn films is higher than that of hot-drawn films. Drawing temperature seems to be independent of the piezolectric stain constant. The glass transition temperature determinded by mechanical experiment tends to increase with the increase of draw ratio but that determined by piezoelectrical experiment is independent of draw ratio. This result is the same in both hot and zone-drawn cases.
김상용,한성수,최경식,Kim, Sang-Yong,Han, Seong-Su,Choe, Gyeong-Sik 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.7
Gel films and mats of ultra-high molecular weight polyethylene were stretched by zone drawing to orient biaxially, and their physical and mechanical properties were studied. The maximum storage modulus of the drawn films at -15$0^{\circ}C$ and room temperature were 215 and 165 GPa, respectively. The drawability of gel film is better than that of gel mat but the maximum storage modulus of gel mat is higher than that of gel film.
축차이축연신 Poly(vinylidene Fluoride) 필름의 압전성과 역학적 성질
김상용,박철,최경식,Kim, Sang-Yong,Park, Chul,Choi, Kyung-Shik 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.7
Piezoelectric and mechanical properties of uniaxially and two step biaxially drawn poly(vinylidene fluoride) films were investigated and discussed in terms of morphology. Piezoelectric constants(e31) of two step biaxially drawn films were higher than those of uniaxially drawn films under the same poling conditions(about 0.5MV/cm.) In two step biaxially drawn films, dynamic tensile moduli in the drawing direction were higher than those in perpendicular direction to the drawing direction. Thermal stability of two step biaxially drawn films were better than that of uniaxially drawn films.
김상용,나상현,설창,Kim, Sang-Yong,Na, Sang-Hyun,Seoul, Chang The Korean Fiber Society 1988 한국섬유공학회지 Vol.25 No.6
Effect of zone-drawing conditions (draw temperature and draw ratio) on the structure and properties of the ultrahigh molecular weight polyethylene(UHMWPE) single crystal mats(SCM) was investigated. Mats were made by slow filtering and drying of single crystals crystallized in the dilute xylene solution of UHMWPE. These mats have platelike lamellar structure with mp 137$^{\circ}C$ and crystallinity 0.71. High draw ratio up to 40 was obtained by zone-drawing of the UHMWPE SCM near melting temperature. The birefringence, crystallinity, tensile modulus and breaking tensile stress of drawn mats appeared not to depend on the draw temperature but increased with increasing draw ratio. The maximum tensile modulus obtained in this experiment was 78 GPa.
체류시간(滯留時間)과 원판회전속도(圓板回轉速度)가 회전원판생물막법(回轉圓板生物膜法)의 처리효율(處理?率)에 미치는 영향(影響)
김상용,Kim, Sang Yong 대한토목학회 1984 대한토목학회논문집 Vol.4 No.3
본(本) 연구(硏究)는 고정미생물막(固定微生物膜)을 이용한 회전원판법(回轉圓板法)이 저농도(低濃度)의 유입수(流入水)로부터 고농도(高濃度) 유입수(流入水)로 단계별(段階別)로 변(變)하는 오수(汚水)에 대해 각(各) 단계별(段階別) 처리효율(處理?率)과 회전원판(回轉圓板)의 회전속도(回轉速度)와 체류시간(滯留時間)이 처리효율(處理?率)에 어떤 영향을 미치는지를 분석(分析)하여 국내오수처리(國內汚水處理)에 대한 회전원판법(回轉圓板法)이 개발(開發)에 기여코자 한다. 고농도(高濃度)의 유입수(流入水)는 저농도(低濃度)의 일반오수(一般汚水)에 분뇨(糞尿)를 투입(投入)하여 그 농도(濃度)를 인위적(人爲的)으로 만들어 사용했으며, 이들 유입수(流入水)에 대한 pilot plant의 실험결과(實驗結果)는 원판(圓板)의 회전속도(回轉速度)가 3 rpm, 체류시간(滯留時間)이 120 분(分)인 경우가 경제성(經濟性)이 있는 것으로 나타났으며, 단계별(段階別) 처리효율(處理?率)은 첫 단계(段階)에서 유입수(流入水)의 농도(濃度) 관계(關係)없이 40~50%정도의 $BOD_5$ 제거율(除去率)을 나타내었고, 용적부하(容積負荷) $2.0kgBOD/m^2$ 일(日)이 고농도(高濃度)에서도 방류수(放流水)의 $BOD_5$ 제거율(除去率)이 88~90% 정도로 양호(良好)하였다. A mult-stage rotating biological contactor process was evaluated by using the mixtures of nightsoil and sewage as influent substrate. An emphasis was concentrated on the BOD removal efficiency at each stage of the process with respect to hydraulic detention times, rotating speeds of the disc and influent organic substrate concentrations. The results indicated that the process was found to be economically feasible when operated at hyduraulic detention time of 2 hours and disc rotating speed of 3 RPH. As to treatment efficiency, BOD removal efficiency of 40 to 50 percent could be obtained at the first stage regardless of influent organic substrate concentrations. The overall BOD removal efficiency of the process was found to be 88 to 90 percent at even high organic loading of $2.0kgBOD/m^3{\cdot}day$.