• 한국수소및신에너지학회논문집
• /
• 제7권2호
• /
• pp.165-171
• /
• 1996

The effect of rolling on the charge-discharge property was studied for metal hydride negative electrode. $(LM)Ni_{3.6}Al_{0.4}Co_{0.7}Mn_{0.3}$(pleateau pressure : below 1 atm at room temperature, volume expansion : 9%, entalpy : $8.7kcal/molH_2$) alloy was prepared by arc melting, and then it was coated with various copper weight percent. The copper coated alloys were then rolled with the different reduction ratio. From the results, it was found that the maximum discharge capacity increased with increasing reduction ratio, and 15wt% copper coated sample shows the highest discharge capacity, 324mAh/g, after rolling with 30% reduction ratio. In view of cycle life for the negative electrode, the 15wt% copper coated electrode which was rolled with 13% reduction ratio showed the longest cycle life compared with other electrodes.

• 한국소음진동공학회논문집
• /
• 제15권9호
• /
• pp.1077-1083
• /
• 2005

Electro-Active Paper (EAPap) is one of attractive electro-active polymer (EAP) materials for artificial muscles due to its many advantages such as light weight, biologically degradable, low cost, large displacement output, low actuation voltage and low power consumption. However, drawbacks of EAPap actuators include low force output and humidity dependence. To enhance the performance of EAPap, conductive polymer (PPy) and SWNT/conductive polymer (PANI) are coated on EAPap PPy as conductive polymer is coated on cellulose EAPap by means of electrochemical deposition. Two different dopants are used in PPy through conducting polymer processing. SWNTS are mixed with PANI in emeraldine base along with different dopants. The compound materials are coated on cellulose EAPap using spin coating system. The performance of PPy/EAPap and SWNT/PANI/EAPap are evaluated in terms of bending displacement, blocked force, and the effects of dopants, humidity, coaling time, voltage and frequency are investigated. Comparing with EAPap actuators, SWNT/PANI/EAPap actuators show $200\%$ improvement of bending displacement and $300\%$ increment of blocked force.

• 한국토양비료학회지
• /
• 제50권1호
• /
• pp.49-55
• /
• 2017

Chinese cabbage cultivation and ammonia volatilization experiments were done to evaluate the efficiency of Agrotain coated urea (GSP 80% + Agro; GSP 100% + Agro) against conventional urea (GSP 80%; GSP 100%). Fresh weight of Chinese cabbage were 17.2% and 7.3% higher in the treatments that received GSP 80% + Agro and GSP 100% + Agro, respectively, of those from the treatments that received urea alone. Likewise, the nitrogen use efficiency of Chinese cabbage in the treatments that received Agrotain coated urea were significantly higher at the rate of 3.5% (GSP 80% + Agro) and 1.9% (GSP 100% + Agro) compared to urea alone treatments. Ammonia emission was substantially higher at the rate of $107.6N\;mg\;chamber^{-1}$ with the application of only GSP 100%. However, nearly 28.3% of ammonia emission was considerably reduced with the use of Agrotain coated urea. Hence, we recommend the use of Agrotain coated urea in conventional farming for increased crop yield as well as simultaneous reduction of nitrogenous fertilizer use.

• Journal of Applied Biological Chemistry
• /
• 제64권1호
• /
• pp.1-4
• /
• 2021

Ambient air pollution, in particular, particulate matter (PM) pollution imposes serious health concerns such as hospitalization and premature deaths, worldwide. While commercial breathing masks are in use for protection against this hazardous issue, yet their efficiency in filtering PM was not up to the par, besides several other discomforts such as poor breathability due to reduced air flow, sweat production etc. In this study, commercial face mask coated with β-glucan, a high molecular weight polymer is tested for its efficacy in filtering PM. Quantification of PM before and after filtration and microscopic observation (using scanning electron microscopy (SEM)) of the fabric used in filtering the dust pollutants (generated from wood chips and cigarette) showed that β-glucan coated fabric were significantly efficient in capturing PM (size of 10 and 2.5 ㎛ in diameter) than that of the untreated control fabric, wherein the former had filtration efficacy with fold increase of 11.6 and 2.6 towards capturing PM2.5 and PM10 respectively than the latter. Thus, β-glucan coated fabric was found to be effective in filtering PM.

• 한국세라믹학회지
• /
• 제41권5호
• /
• pp.410-416
• /
• 2004

초음파 여기 페라이트 플레이팅(ultrasound-enhanced ferrite plating)법으로 복잡한 형상을 가진 코디어라이트 허니컴에 마그네타이트(Fe$_3$O$_4$)를 코팅하고, 제조 공정 조건의 변화가 마그네타이트 코팅 막의 형성과 미세구조에 미치는 영향에 대해 고찰하였다. 또한, 수소 환원과정을 통해 제조된 산소부족형 마그네타이트 막을 이용하여 코팅막의 형성조건이 $CO_2$가스 분해 특성에 미치는 영향에 대해 검토하였다. pH 완충제($CH_3$COONH$_4$)의 몰농도가 증가함에 따라 제조된 허니컴에 코팅된 마그네타이트 막의 평균 입자 크기는 약 200∼250 nm로 증가하였다. 이들 코팅막을 30$0^{\circ}C$에서 2시간동안 수소 환원시켜 산소부족형 마그네타이트를 만든 후 $CO_2$ 가스 중에서 온도를 올리면서 반응기 내부의 압력변화를 측정한 결과, 약 315∼34$0^{\circ}C$를 시작으로 $CO_2$가 분해하면서 반응기 내부의 압력이 감소하였다. 350"$^{\circ}C$에서 수소 환원된 시편에서는 산소부족형 마그네타이트와 일부 $\alpha$-Fe 상이 나타났다. 허니컴에 코팅된 마그네타이트의 수소 환원 및 $CO_2$ 가스 분해 과정에서 생기는 중량 변화를 측정한 결과 수소 환원 과정에서 약 320∼34$0^{\circ}C$에서부터 급격한 중량감소가 일어났고, $CO_2$ 가스 분해 과정에서는 중량의 증가가 나타났다.

• 현장농수산연구지
• /
• 제13권1호
• /
• pp.19-26
• /
• 2011

최근 우리나라에서는 육묘에서 이앙작업 단축을 위하여 본답육묘(못자리)에서 하우스 육묘(육묘공장) 시스템을 전국적으로 채택하고 있으나 이앙당시 유묘의 연약한 생장으로 모내기 약 2주전 별도로 본답 또는 외기로 육묘상자를 옮겨 경화를 시키는 번거로운 문제점에 있다. 따라서 본 시험에서는 철분코팅볍씨를 이용할 경우 다음과 같은 결과를 얻어 육묘공장(못자리)에서도 본 연구결과를 활용할 경우 유용할 것으로 사료되어진다. 1. 철분코팅을 한 볍씨는 무처리에 비하여 발아, 출아, 유묘생장에 극히 정상적이었다. 2. 이앙당시 유묘의 초장 생장은 무처리에 비하여 작아 육묘상자 운반과정, 이앙작업 시 손상이 줄어 들 것으로 보였다. 3. 유묘의 엽수 뿌리 생육이 무처리에 비하여 양호하여 초기 유묘생장에 유리할 것으로 보였다. 4. 철분코팅을 한 유묘의 지상부, 지하부 생장이 무처리에 비하여 양호하여 건묘육성에 유리한 것으로 나타났다.

• Archives of Pharmacal Research
• /
• 제13권2호
• /
• pp.151-160
• /
• 1990

In order to develop a controlled-release oral drug delivery system (DDS) which sustains the plasma acetaminophen (AAP) concentration for a certain period of time, microporous membrane-coated tablets were prepared and evaluated in vitro. Firstly, highly water-soluble core tablet of AAP were prepared with various formulations by wet granulation and compression technique. Then the core tablets were coated with polyvinychloride (PVC) in which micronized sucrose particles were dispersed. Effect of formula compositions of core tablets and coating suspensions on the pharmaceutical characteristics such as drug release kinetics and membrane stability of the coated tablets was investigated in vitro. AAP was released from the coated tablets as a zero-order rate in a pH-independent manner. This independency of AAP release to pH change from 1.2 to 7.2 is favorable for the controlled oral drug delivery, since it will produce a constant drug release in the stomach and intestine regardless of the pH change in the GI tract. Drug release could be extended upto 10 h according to the coating condition. The release rate could be controlled by changing the formula compositions of the core tablets and coating suspensions, coat weight per each tablet, and especially PVC/sucrose ratio and particle size of the sucrose in the coating suspension. The coated tablets prepared in this study had a fairly good pharmaceutical characteristics in vitro, however, overall evaluation of the coated tablet should await in vivo absorption study in man.

• Elastomers and Composites
• /
• 제1권1호
• /
• pp.49-55
• /
• 1966

Based upon the results of the previous work, the experiments are concentrated on the improvement of the durability of rubber coated fabrics as a rain garment material. To obtain a much lighter and durable coated fabric, several kinds of light weight cotton prints having almost equal density in warp and fillingwise were chosen. Rubber coating on these prints was made by topping and spreading process using rubber compound of various viscosity, and the physical properties of final product were analysed and interpreted in terms of adhesion and durability. The results are as follows. 1. Any noticeable difference between two coating processes was not found in terms of physical properties. 2. Base fabrics should be dipped once into a dilute rubber compound before coating operation in order to obtain a uniform adhesion and physical properties, and the optimum range of the viscosity of dipping paste are from 100 poise to 200 poise. 3. Generally, the tearing strength of the coated fabrics is inversely proportional to the adhesion. 4. It was assumed that the increase of the water proofness after water immersion on the finished material which have dense base fabric is chiefly due to the swelling of the cellulosic fiber.

• 현장농수산연구지
• /
• 제12권1호
• /
• pp.53-62
• /
• 2010

사과 홍로품종에서 칼슘이 코팅된 포장지의 수확 후 저장기간 연장에 미치는 효과를 알아보기 위해 과실을 포장한 후 저장 조건을 달리하여 과실의 품질, 감모율과 부패과율, 이산화탄소와 에틸렌 발생량을 조사한 결과는 다음과 같다. 칼슘 포장지는 다른 포장지에 비하여 당도(가용성고형물)가 상온저장(20~25℃)에서 4주후 약간 높았으며 저온저장(0~1℃)에서는 14주 후 높았다. 과실 경도는 상온저장에서 4주후까지 저온저장에서 14주까지 유지되었다. 총산함량 및 과피의 적색도(Hunter a값)는 오히려 감소되는 경향을 보였다. 감모율은 왁스 및 칼슘 포장지는 다른 처리에 비하여 낮아 상품성 과실이 많게 나타났으나, 저온저장에서는 큰 차이를 인정할 수 없었다. 부패과율과 이산화탄소 발생량은 칼슘포장지가 가장 낮았다. 에틸렌 발생량은 포장지 종류, 저장조건에 따라 차이는 없었다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제30권1호
• /
• pp.34-41
• /
• 2017

Objective: Two experiments were performed to evaluate the effects of coated slow-release urea on nutrient digestion, ruminal fermentation, nitrogen utilization, blood glucose and urea concentration (Exp 1), and average daily gain (ADG; Exp 2) of steers. Methods: Exp 1: Eight ruminally fistulated steers [$503{\pm}28.5kg$ body weight (BW)] were distributed into a d $4{\times}4$ Latin square design and assigned to treatments: control (CON), feed grade urea (U2), polymer-coated slow-release urea A (SRA2), and polymer-coated slow-release urea B (SRB2). Dietary urea sources were set at 20 g/kg DM. Exp 2: 84 steers ($350.5{\pm}26.5kg$ initial BW) were distributed to treatments: CON, FGU at 10 or 20 g/kg diet DM (U1 and U2, respectively), coated SRA2 at 10 or 20 g/kg diet DM (SRA1 and SRA2, respectively), and coated SRB at 10 or 20 g/kg diet DM (SRB1 and SRB2, respectively). Results: Exp 1: Urea treatments (U2+SRA2+SRB2) decreased (7.4%, p = 0.03) the DM intake and increased (11.4%, p<0.01) crude protein digestibility. Coated slow-release urea (SRA2+-SRB2) showed similar nutrient digestibility compwared to feed grade urea (FGU). However, steers fed SRB2 had higher (p = 0.02) DM digestibility compared to those fed SRA2. Urea sources did not affect ruminal fermentation when compared to CON. Although, coated slow-release urea showed lower (p = 0.01) concentration of $NH_3-N$ (-10.4%) and acetate to propionate ratio than U2. Coated slow-release urea showed lower (p = 0.02) urinary N and blood urea concentration compared to FGU. Exp 2: Urea sources decreased (p = 0.01) the ADG in relation to CON. Animals fed urea sources at 10 g/kg DM showed higher (12.33%, p = 0.01) ADG compared to those fed urea at 20 g/kg DM. Conclusion: Feeding urea decreased the nutrient intake without largely affected the nutrient digestibility. In addition, polymer-coated slow-release urea sources decreased ruminal ammonia concentration and increased ruminal propionate production. Urea at 20 g/kg DM, regardless of source, decreased ADG compared both to CON and diets with urea at 10 g/kg DM.