• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1997년도 추계학술대회 논문집
• /
• pp.94-97
• /
• 1997

We investigated the sheet resistance properties of tungsten nitride thin films deposited by RF and DC sputtering system. It deposited at various conditions that determine the sheet resistance. The properties of the sheet resistance of these films were measured under various conditions. Sheet resistance analysed under the flow rate of the argon gas and contents of nitrogen from nitrogen-argon gas mixtures. We found that these sheet resistance were largely depend on the temperature of substrate, gas flow rate and RF power. Very high and low sheet resistance of tungsten films obtained by DC sputtering. As the increase of contents of nitrogen gas obtained from nitrogen-argon gas mixture, tungsten nitride thin films deposited by the reactive DC sputtering and the sheet resistance of these films were increased.

• 생약학회지
• /
• 제4권2호
• /
• pp.71-74
• /
• 1973

The contents of volatile oil and camphor in the oil of Artemisia messer-schmidtiana $B_{ESSER}$ var. viridis $B_{ESSER}$ f. typica $N_{AKAI}$ and Artemisia asiatica $N_{AKAI}$ which were known to be effective as antibacterial, antifungal and antineoplastic agents by screening experimentation, were determined quantatively by gas chromatography. The volatile oil contents of Artemisia messer-schmidtiana $B_{ESSER}$ var. viridis $B_{ESSER}$ f. typica $N_{AKAI}$ and Artemisia asiatica $N_{AKAI}$ are 0.17% and 0.19%, and the camphor contents are 8.51% and 1.46%, respectively.

• Journal of Welding and Joining
• /
• 제28권5호
• /
• pp.93-98
• /
• 2010

The properties of GTA weld for ferritic stainless steel have been studied with different $O_2$ contents in Ar shielding gas at the constant welding speed. A small amount of $O_2$ (0.01~1.0%) was mixed in Ar shielding gas in order to improve the weld penetration. The fully penetrated GTA weld was acquired at 160A weld current shielded by pure Ar gas. Addition of oxygen larger than 0.1% made a full penetration at lower weld current than 160A. The small addition of $O_2$ in Ar shielding gas improved the penetration properties of GTA weld because the $O_2$ in the molten pool accelerated the flow of molten pool and changed the flow pattern from outward to inward direction. The impact energy and DBTT (Ductile- Brittle- Transition-Temperature) of the GTA weld shielded by Ar+$O_2$ (less 0.3%) was similar and the corrosion properties of GTA weld was slightly inferior to those of GTA weld shielded by pure Ar gas.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2011년도 제36회 춘계학술대회논문집
• /
• pp.375-378
• /
• 2011

덕티드로켓 추진기관에 사용되는 불완전연소 가스발생기를 설계/제작하고 연소시험을 수행하여 그 연소특성을 분석하였다. 추진시스템 설계요구조건을 바탕으로 가스발생기를 설계하고 산화제 함유량을 줄이고 금속연료 함량을 증가시킨 불완전연소용 고체연료 조성을 개발하여 가스발생기를 제작하였고, 이를 이용한 연소시험을 통해 다상 유동의 불완전연소 가스가 존재하는 가스발생기의 성능예측을 위해서는 별도의 해석기법이 요구됨을 확인하였다.

• 한국공작기계학회논문집
• /
• 제12권6호
• /
• pp.97-103
• /
• 2003

Currently, due to serious increase of pollution scones, lots of technology has been involved to reduce exhaust gas in diesel engine. But the amounts of exhaust gas can not be decreased somehow due to the increase of diesel vehicles. Moreover, emission standards of each counties are being stringent in advanced countries such as USA and Europe. In the near future, sulfur contents in fuel must be essentially reduced f3r health and environment because sulfur can basically reduce exhaust gas. Therefore, when will be applied to Bio-diesel and ULSD, they could reduce sulfur contents of fuel without aftertreatment and might conform the influence of engine performance, emission, smoke and fuel consumption.

• 전기학회논문지
• /
• 제61권11호
• /
• pp.1650-1655
• /
• 2012

AC-PDPs have recently achieved good performance and their image quality can sufficiently compete with the LCD TV. However, it is necessary more effort to improve the luminance and luminous efficacy in the PDP technology. The gas mixture ratio plays a very important role in discharge characteristics, but the mechanism of gas discharge is complex and complicated. In this paper, we investigate the mechanism of gas discharge with Ne+Xe miture ratio through zero and two dimensional fluid simulation.

• Journal of the Korean Wood Science and Technology
• /
• 제31권6호
• /
• pp.83-88
• /
• 2003

The woodceramics are porous amorphous carbon and glassy carbon composite materials. Woodceramics attracted a lot of attention in recent years because they are environmentally friendly and because of their unique functional characteristics such as catalysis, moisture absorption, deodorization, purification, carrier for microbial activity, specific stiffness, corrosion and friction resistance, and their electromagnetic shielding capacity. In this paper, we made new products of clay-woodceramics to investigate the industrial analysis and ethylene gas adsorption for basic data of building- and packging- materials keeping fruit fresh for a long time. Clay-woodceramics were carbonized for 3 h of heating in a special furnace under a gas flow of nitrogen(15 ml/min.) from 3 layers-clay-woodparticleboard made from pallet waste wood, phenol- formaldehyde resin(hereafter PF, Non volatile content:52%, resin content 30%), and clay(10%, 20% and 30%). Carbonization temperature was 400℃, 600℃ and 800℃. Experimental results shows that the higher the carbonization temperature, the higher the fixed carbon and the lower the volatile contents. The higher the clay content, the more the ash content. The higher the carbonization temperature, the more the ethylene gas adsorption. Carbonization temperature of 800℃ gave the best reslts as same as that of white charcoal and activated carbon.(800℃-clay-woodceramic: 5.36 ppm, white charcoal: 5.66 ppm, activated carbon: 5.79 ppm) The clay contents did not make difference of ethylene gas adsoption.

• 전기학회논문지
• /
• 제58권1호
• /
• pp.155-159
• /
• 2009

To increase the luminance and luminous efficacy in the discharge for alternating current plasma display panel (ac PDP), the increment of Xe contents and long discharge gap are necessary. However, the driving voltage and the cost of driving circuit increases in the high Xe contents and long discharge path condition. In this paper, a long gap ITO hump electrode (LGH) model for discharge cells of ac PDP is evaluated in the various Xe contents($5{\sim}20%$). The discharge voltage of LGH structure is lower about 30V than that of ITa reference structure with same main discharge gap. The LGH structure has lower power consumption and higher luminance than those of reference structure, respectively. Also, the luminous efficacy of LGH structure is higher about 20% than that of ITO reference structure in the 20% Xe contents.

• 약학회지
• /
• 제22권4호
• /
• pp.242-249
• /
• 1978

We have compared the panaxadiol and panaxatriol contents of white ginsengs from different countries and red ginseng, by using gas and high-pressure liquid chromatographies. Oleanolic acid contents in various ginseng species were compared by gas liquid chromatography and densitometry. Korean ginseng was found to contain greater amount of panaxadiol and panaxatriol than those of any other countries. The ginsengs from other countries, especially Chikusetzu ginseng, were found to contain far greater amount of oleanolic acid than Korean ginseng.

• 한국환경농학회지
• /
• 제6권1호
• /
• pp.38-43
• /
• 1987

수도(水稻)의 영양상태(營養狀態)와 Ozone가스 피해(被害)와의 관계(關係)를 구명(究明)하기 위(爲)하여 진주(眞珠)벼를 공시(供試)하여 질소(窒素), 린산(燐酸), 가리(加里), 표준비(標準肥)에 각각(各各) 50%증비(增肥) 및 50%감비(減肥)하여 Ozone가스 0.3ppm을 3시간접촉후(時間接觸後)에 엽피해율(葉被害率), malondialdehyde, peroxidase의 전기영동(電氣泳動) 및 무기성분함량변화(無機成分含量變化)을 조사(調査)한 결과(結果)는 다음과 같다. 1. 질소증시(窒素增施) 및 가리감비(加里減肥)로 Ozone가스의 피해(被害)가 증가(增加)된다. 2. Ozone가스 피해율(被害率)에서 malondialdehyde의 함량(含量)이 증가(增加)된다. 3. $K_2O/N$비(比)가 낮을수록 엽피해(葉被害)가 증가(增加)한다. 4. Ozone가스 피해(被害)로 엽중(葉中) 질소(窒素), 린산(燐酸), 가리함량(加里含量)이 감소(減少)하는 경향(傾向)이다. 5. Peroxidase를 전기영동(電氣泳動)한 결과(結果) 시비량(施肥量)에 따른 band의 차이(差異)는 발견(發見)하지 못하였으나 Ozone가스 접촉(接觸)으로 2, 3, 4번째 band에서 변화(變化)가 있었다.