• 한국대기환경학회지
• /
• 제31권4호
• /
• pp.368-377
• /
• 2015

Bunker C fuel oil is a high-viscosity oil obtained from petroleum distillation as a residue. The sulfur content of bunker C fuel oil is limited to 4.0% or even lower to protect the environment. Because bunker C fuel oil is burned in a furnace or boiler for the generation of heat or used in an engine for the generation of power, carbon dioxide is emitted as a result of combustion. The objective of this study is to investigate $CO_2$ emission characteristics of bunker C fuel oil by sulfur contents. Calorific values and carbon contents of the fuels were measured using the oxygen bomb calorimeter method and the CHN elemental analysis method, respectively. Sulfur and hydrogen contents, which were used to calculate the net calorific value, were also measured and then net calorific values and $CO_2$ emission factors were determined. The results showed that hydrogen content increases and carbon content decreases by reducing sulfur contents for bunker C fuel oil with sulfur contents less than 1.0%. For sulfur contents between 1.0% and 4.0%, carbon content increases as sulfur content decreases but there is no evident variation in hydrogen content. Net calorific value increases by reducing sulfur contents. $CO_2$ emission factor, which is calculated by dividing carbon content by net calorific value, decreases as sulfur content decreases for bunker C fuel oil with sulfur contents less than 1.0% but it showed relatively constant values for sulfur contents between 1.0% and 4.0%.

• 한국잠사곤충학회지
• /
• 제37권2호
• /
• pp.109-113
• /
• 1995

와그너폿트(1/20,000a)에 묘목을 심고 유리온실내에서 황(98% S함유)의 시비량을 0, 30, 60, 120kg/10a의 4수준으로 하고 황시용이 뽕나무 생육, 토양 및 뽕잎의 화학성에 미치는 영향을 조사한 결과는 다음과 같다. 1. 뽕나무의 가지길이는 황 30kg/10a시용구에서 무시비구 대비 3.2cm 더 자랐으나, 60kg/10a 이상 다량시용한 구에서는 3.7cm 자람이 떨어졌다. 2. 토양의 pH는 황시비에 따라 떨어졌으며, 황 120kg/10a시용구에서 가장 많이 떨어져 무시비구 대비 pH3.0이 떨어졌으며, 시용된 황의 용해는 시비후 4~11일 사이에 일어나는 것으로 판단되었다. 3. 황시비는 뽕잎중의 수분율, 전질소, No3-N, K, S의 함량을 떨어뜨렸으며 F, Ca은 증가시켰다. 황시비량이 60kg/10a 이상이면 P, S, K, 함량은 증가하였으며, Ca는 감소하는 경향을 보였다.

• 한국환경보건학회지
• /
• 제14권2호
• /
• pp.29-41
• /
• 1988

This study was performed to investigate the air pollution levels in Daegu area titrough measuring of contents of water, chlorophyll, water soluble sulfur and lead metal in the leaves of roadside trees and chemical properties of soil under the urban trees. The results can be summarized as follows 1. The range of water content was from 60.4% to 74.6%. The comparisons of chlorophyll, water soluble sulfur and water content were regression equation, chlorophyll=0.1981+ 0.0040 water content (July), water soluble sulfur=3,139-0.0416 water content (July). and correlation coefficient, r=0.561 and r=0.549 respectively 2. Average contents of chlorophyll, water soluble sulfur and lead metal in the leaves of roadside tree at sampling sites were chlorophyll 0.050, 0.072mg/cm$^2$, water soluble sulfur 0.244, 0.333%, and lead metal 12.25, 12.68ppm in Oct. and Jul. respectively. 3. Correlation between chlorophyll and contents of water soluble sulfur and lead metal in the leaves of roadside tree at sampling sites were water soluble sulfur r=-0.564, -0.613 and lead metal r=-0.693, -0.699 in October and July, respectively. 4. Correlation between chlorophyll and water content, water soluble sulfur and lead metal in the leaves of tree showed positive significance.

• Preventive Nutrition and Food Science
• /
• 제21권2호
• /
• pp.160-164
• /
• 2016

Two onions (Sulfur-1 and Sulfur-4) cultivated with different sulfur applications were thermally processed to elucidate the effects of heat treatment on browning index and antioxidant activity. Sulfur-4 onion had higher sulfur content compared with the Sulfur-1 onion. After thermal processing, browning intensity was different between the two onions juices, with lower values observed for Sulfur-4 onion juice. This suggests that sulfur inhibits the Maillard browning reaction. The total reducing capacity of the juices increased at higher thermal processing temperatures; however, it was also lower in the Sulfur-4 onion juice. This suggests that the heat treatment of onions enhanced their antioxidant activity, but the effect was offset in the Sulfur-4 onion juice presumably due to higher sulfur content. This study indicates that sulfur, a core element for the functionality of onions, can decrease the antioxidant activity of thermally processed onions because of its potential as a Maillard reaction inhibitor.

• Corrosion Science and Technology
• /
• 제7권4호
• /
• pp.193-196
• /
• 2008

This article briefly tests and analyzes the sulfur content and the distribution of active sulfur in the crude oil of Kurkow Kazakhstan and Siberian Russian, and discusses the relationship between active sulfur content and total sulfur content, active sulfur and corrosion. At the same time, it measures the open circuit potential of X70 steel and X60 steel witch have been immerged in the above two kind of crude oil for a period of time, discusses the sulfur corrosion to metal.

• 한국약용작물학회지
• /
• 제12권6호
• /
• pp.454-458
• /
• 2004

잇꽃 종실의 품질 향상에 효과적인 황 시용방법을 구명하고자 황분말 20 kg/10a와 유안의 시용방법 및 시용량을 달리하여 종실의 영양적 품질에 미치는 영향을 비교 조사한 결과는 다음과 같다. 1. 종실의 질소와 황 함량은 황 무시용구에 비해 시용구에서 높은 경향이었다. 황 처리간에는 질소 함량은 차이가 없었으나, 황 함량은 유안 토양시비량이 증가할수록 높아졌다. 유안 시비방법 간에는 토양시비 33 kg/10a와 엽면시비 간에 큰 차이는 없었다. 질소/황 비율은 황 시용으로 질소/황 비율이 저하되었고, 유안 토양시비 간에는 시용량이 증가할수록 감소하여 유안 49.5 kg/10a 처리시 가장 낮았다. 2. 종실의 조지방과 조단백질 함량은 황 시용시 무시용에 비하여 높았으며, 황 유형 간에는 조지방이 유안 엽면시비에서 가장 높았고, 조단백질이 유안 16.5 kg/10a에서 가장 낮았던 것을 제외하고 차이가 없었다. 3. 총페놀성 화합물 함량과 항산화 활성은 황 시용으로 증가하였다. 황 처리 간에는 총페놀성 화합물 함량은 차이가 없었으나, 항산화 활성은 황분말과 유안 33.0 kg/10a 처리에서 다소 높았다.

• 한국초지조사료학회지
• /
• 제8권3호
• /
• pp.152-157
• /
• 1988

The effect of gypsum application was tested on dry matter yield, sulfur uptaken, composition of Ritrogen compound and sulhr compound and sulfur balance in mixed pasture. Total dry matter yields and sulfur uptake by grasses increased with the increasing of gypsum application rates. The ratios between total nitrogen and total sulfur in masses decreased with the increase of sulfur uptake at 2nd and 3rd cutting times. Cysteine content was little affected by gypsum while methionine content slightly increased an 4.0, 6.0 kg3 per 10a levels at 2nd and 3rd cutting times. The uptake of nitrate nitrogen decreased with gypsum application and dry matter digestibility increased about 1.1 to 3.3%. The soil pHs after experiment become high in surface and subsoil till 6.0 kg.S per 10a, but low at 10.0 kg.S per 10a. The content of sulfur in surface soil was 19.9 ppm after experiment, but very high in subsoi1,ranging from 94 to 143 ppm.S. Sulfur leached from the surface soil by 0.69, 2.39, and 6.24 kg.S per 10a in the plots of 4.0, 6.0, and 10.0 kg.S per 10a, respectively.

• Elastomers and Composites
• /
• 제27권4호
• /
• pp.275-280
• /
• 1992

Vulcanization reaction was studied by DSC through the comparison cure states to physical properties and the investegation of chemicals effect on vulcanization. Reaction enthalpy showed a good correlation with physical properties, increased with the increase of sulfur content, and increased with accelerator content, as well, where the ratio of MOR to sulfur was less than 1.0. Reaction temperature was decreased with increasing accelerator content and decreased also with sulfur content where the ratio of MOR to sulfur was more than 1:3. As a result, the cure state and reaction temperature could be controlled effectively with the ratio of accelerator to sulfur in the range of a third to unity.

• 한국수소및신에너지학회논문집
• /
• 제17권3호
• /
• pp.317-323
• /
• 2006

Electric conductive material should be homogeneously mixed with sulfur in sulfur electrode fabrication of lithium/sulfur battery, because sulfur is electric insulator. In this paper electrochemical properties of Li/S battery was studied with various compositions of sulfur electrodes. When content of sulfur changed from 40 wt.% to 80 wt.%, the 60 wt.% sulfur electrode showed the maximum capacity of 1489 mAh/g-sulfur. Electrochemical properties of Li/S battery using 60 wt.% sulfur was also investigated with various carbon contents. The discharge capacity changed as a function of carbon contents. The optimum composition was 25 wt.% carbon for 60 wt.% sulfur electrode.

• 한국환경농학회지
• /
• 제4권1호
• /
• pp.52-56
• /
• 1985

아황산(亞黃酸)가스가 배출(排出)되는 공단주변(工團周邊)에서 재배(栽培)되는 배나무와 수도(水稻)의 엽내(葉內) 류황함량(硫黃含量) 및 감수율(減收率)을 조사(調査)하여 아황산(亞黃酸)가스가 수량(收量) 및 엽내(葉內) 류황(硫黃) 축적에 미치는 영향과 이들간의 관계(關係)를 규명하기 위해 실시한 실험(實驗)의 결과(結果)를 요약(要約)하면 다음과 같다. 1) 배나 수도(水稻) 공(共)히 대조지점(對照地點)에 비해 피해지점(被害地點)의 엽내(葉內) 류황함량(硫黃含量)이 높고 감수(減收)가 되는 경향을 보였다. 2) 배나 수도(水稻) 모두 엽내(葉內) 류황함량(硫黃含量)과 감수율간(減收率間)에는 매우 높은 유의상관(有意相關)을 보여 공해(公害)의 영향(影響)으로 감수(減收)가 된다는 것을 보여 주었다. 3) 류황산화물(硫黃酸化物)(SOx)을 주로 배출(排出)하는 공단주변(工團周邊)에 재배(栽培)되는 배나 수도(水稻)의 공해피해(公害被害)에 의한 보상(補償)을 위(爲)해서는 엽내(葉內) 류황함량(硫黃含量)과 실감수율(實減收率)과의 회귀식(回歸式)을 아황산(亞黃酸)가스 피해지(被害地)에서의 수량감수율(收量減收率) 조사(調査)에 참고(參考)함이 좋을 것으로 생각된다.