• 생물환경조절학회지
• /
• 제10권2호
• /
• pp.106-110
• /
• 2001

양액재배용 배지로 팽연화 왕겨를 사용할 경우 반촉성 및 억제 재배용으로 사용 가능한 횟수는 3회 사용시 $Ca^{++}$의 다량 용출로 인한 배지의 다져짐이 나타나며 원형여지크로마토그래피상의 부숙도 판정에서도 2작기 경과동안 거의 부숙되는 것으로 미루어 2회까지 사용이 안정적인 것으로 판단되였다. 2회 사용일수의 합산이 245일 이고 정상적인 급액은 이루어지지 않았으나 30일 정도의 재상용전 기간 동안에도 습윤상태를 유지한 것으로 미루어 장기재배 1작기에도 사용이 가능한 것으로 판단되나 펄라이트의 적정 사용기간에 비해 1/3 정도로 사용기간은 짧은 편이었다. 교체비용을 포함한 배지 재료비는 펄라이트 대비 65.3% 정도로 경제적이었다.

• 한국세라믹학회지
• /
• 제37권7호
• /
• pp.665-672
• /
• 2000

The ferroelectric YMnO3 thin films were prepared by MOD(metal-organic decomposition) method with Y- and Mn-acetylacetonate as starting materials. Thin films were grown on various substrates by spin-coating technique. The crystalline phases of the thin films were identified by X-ray diffractometer as a function of heat-treatment temperature, pH of coating solution and substrate. In addition, the effect of Mn/Y molar ratio(0.8~1.2) on the formation of hexagonal-YMnO3 phase was investigated. In forming highly c-axisoriented hexagonal-YMnO3 single phase, the Pt coated Si substrate was more effective than the bare Si substrate, and the optimum heat-treatment condition was at 82$0^{\circ}C$ for 30 min. Higher Mn/Y molar ratio within 0.8~1.2 and pH of YMnO3 precursor solution within 0.5~2.5 favored formation of ferroelectric hexagonal phase rather than orthorhombic phase. Leakage current density of the hexagonal-YMnO3 thin film formed on Pt(111)/TiO2/SiO2/Si substrate was low enough as 0.4~4.0$\times$10-8(A/$\textrm{cm}^2$) at 5 V and its remanent polarization(Pr), calculated from the P-E hysteresis loop, was 3 nC/$\textrm{cm}^2$.

• 한국표면공학회지
• /
• 제26권3호
• /
• pp.115-120
• /
• 1993

Aluminum thin films were deposited on the silicon substrate by the pyrolysis of TrilsoButylAluminum (TIBA) in a cold wall LPCVD reactor. The effect of substrate on the surface topograply and the decomposition reaction was investigated. The activation energy for the decomposition of TIBA was turned out to be 1 eV from the Arrhenious plot. The surface topography of the CVD aluminum could be improved by the application of thin metal film, which was in-situ deposited on the silicon prior to CVD process.

• 청정기술
• /
• 제14권3호
• /
• pp.218-223
• /
• 2008

마이크로 에멀젼 수용액에 분산된 반응성 유기화합물을 전기분해를 통하여 얻을 수 있는 수산화이온 및 수소이온을 이용하여 가수분해시키고, 분해속도를 비교하는 실험을 수행하였다. 반응물질로 사용된 p-nitrophenylacetate (PNPA)의 가수분해로부터 발생하는 p-nitrophenoxide 농도 변화에 따른 흡광도 변화를 이용하여 분해속도를 얻을 수 있었다. 자체 조립한 전기분해 장치를 이용하여 전압, 반응온도, 반응물질 양에 따른 분해속도 변화를 관찰하였다. 마이크로 에멀젼 사용으로 인하여 반응물질 용해도를 증가시킬 수 있으며, 전기분해법 사용으로 인하여 반응속도 조절이 용이하며, 유지비용이 저렴하고, 기존 화학물질 투여방법에 비해 소모되는 시약 보충 및 반응 후 부산물 처리 등의 과정이 수월하다. 유기물질 분해에 대한 메커니즘 및 수처리 분야 응용에 대하여 토의하였다.

• 보존과학연구
• /
• 통권30호
• /
• pp.31-46
• /
• 2009

In the study, we confirmed morphological traits and calculated the Risk Class of 25 mould species, including Tyromyces palustris, through decomposition rate of substrate for characteristic confirmation of injured microorganisms. We received the injured microorganisms in wood and it was pure cultivated. We observed growth traits and decomposition rate of substrate. Also, it allows the calculation of Risk Class to be worried in the case of growth in wooden cultural properties. As a result, Tyromyces palustris, representative of brown-rot, has the characteristics about decomposition rate of substrate - Cellulose ; more active(+++), Lignin ; more active(+++), Xylan ; more active(+++), Starch ; active(++). We classified Tyromcyes palustris as a first Risk Class and as a second Risk Class about Schizophyllum commune et al(9 species, See table 1. We look forward to offering standard data base for evaluating Risk Class as a matter of applying preventive conservation in wooden cultural properties through our study.

• Journal of Korean Vacuum Science & Technology
• /
• 제3권1호
• /
• pp.16-23
• /
• 1999

Deposition of parylene (PA) films has been explored at substrate temperatures below 2$0^{\circ}C$ and pressures below 4 torr. The film thickness was measured using AFM and the film thickness measured was 3,500-12,000$\AA$ and the growth rate was 20-70$\AA$/min. T도 dielectric constant of the deposited PA films was found to be 2.66 and the dielectric strength was in excess of 2$\times$105V/cm. The growth rate became a maximum at a precursor decomposition temperature of $600^{\circ}C$. It was found that the growth rate decreased with increasing substrate temperature, whereas it increased with increasing pressure. At a precursor decomposition temperature of 75$0^{\circ}C$ or at a deposition pressure above 1 Torr the film surface became rough due to particle formation in the gas phase. The condensation of a p-xylylene monomer on the substrate surface turned out to be a rate-limiting step in the growth of the PA films.

• 대한환경공학회지
• /
• 제39권8호
• /
• pp.489-493
• /
• 2017

미생물연료전지는 하폐수에 존재하는 다양한 유기성물질을 전기에너지로 변환시킬 수 있는 생물전기화학적공정이다. 본 연구에서는 전산모사를 통하여 산화전극의 크기, 전극간 거리, 전체 산화전극면적이 기질분해에 미치는 영향을 알아보고자 하였다. 생활하수를 처리하는 다중산화전극 및 SPA (Spaced electrode assembly)형 연속식 미생물연료전지공정을 모사하였으며, 전산모사결과에 따르면 단일전극의 크기에 의한 영향보다는 전극간 거리가 짧을수록 기질분해속도가 빠른 것으로 나타났다. 특히 전체 산화전극의 면적이 큰 경우가 기질분해가 가장 빠른 것으로 나타났다. 본 연구를 통하여 미생물연료전지공정의 설계에 있어서 율속단계로 알려진 환원전극의 크기 외에도 산화전극의 크기 및 전극간 거리 또한 기질분해 속도에 영향을 미칠 수 있는 중요한 인자임을 알 수 있었다.

• 한국전기전자재료학회논문지
• /
• 제11권6호
• /
• pp.458-464
• /
• 1998

This paper gives characterization of substrate and PZT(53/47) thin film deposited by metalorganic decomposition, which is concerned in deposition process and device fabrication process, to fabricate micro electro mechanical system (MEMS) device with piezoelectric material. The PZT thin films deposited by MOD at 700^{\circ}C$ for 30 minutes had a polycrystallinity, that is, no substrate dependence, while different interface were developed depending on the bottom electrodes. Such a structural variation could influence on not only the properties of the PZT film but also etching process for fabricating MEMS devices. Therefore the electrode structure is a very important factor in the deposition of the PZT film during etching process by HF acid for MEMS device with piezoelectric material. Piezoelectric coefficients of the PZT films on the different substrates were 40 and 80 pm/V at an applied voltage of 4V. Based in these results, it was possible for deposition of the PZT film by MOD to apply MEMS device fabrication process based on piezoelectricity after selection of proper bottom electrode.

• Journal of Information Display
• /
• 제8권4호
• /
• pp.1-4
• /
• 2007

In the present study, we propose Monte Carlo simulation that takes into consideration the interface phenomena between liquid crystal and substrate. We use rigid model molecules of liquid crystal and substrate. Interface is generated using potential field that induces decomposition of molecules. We use hard spherocylinders as model liquid crystal molecules. Substrate is modeled as region composed of shorter spherocylinders. Our results show that there is a case in which nematic order is reinforced in the vicinity of rubbed substrate.

• 한국분말재료학회지
• /
• 제16권1호
• /
• pp.56-62
• /
• 2009

The degree of WC decomposition and hardness of thermally sprayed WC-Co coatings are important factors determining the wear resistance of the coatings. In order to minimize the degree of decomposition and to increase hardness, the effects of processing parameters of high velocity oxyfuel(HVOF) spraying on various characteristics of nanostructured WC-12Co coating have been evaluated by an experimental design method. The HVOF sprayed WC-12Co coatings consisted of various carbide phases including WC, $W_2C$ and $W_3Co_3C$, with a much reduced carbon content. The degree of WC decomposition and decarburization was affected by changing barrel length and spray distance. The hardness of WC-Co coatings was strongly related to droplet temperature at substrate, and increased with increasing fuel addition and/or decreasing spray distance. The effective control of processing parameters was discussed in detail for manufacturing a high performance WC-Co coating.