• 대한수의학회지
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• 제39권3호
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• pp.501-512
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• 1999

We analyzed the contents of 12 types of minerals such as calcium in muscle from various species. Thereafter we observed changes of the concentrations according to age, part and sex in major domestic animals. The concentrations of calcium, iron, sodium, potassium, magnesium and zinc were high respectively whilst the content of cobalt, chromium, copper, manganese, molybdenum and nickel were low respectively in the muscle. The concentration of calcium was high in duck and dog but low in pig and horse. Also high level of sodium content was detected in dog and the content of potassium, iron showed high level in horse compared with the content in other animals. In 6 types of microminerals as cobalt, the level of muscle were no more than 1 ppm showing very low content in all animal, but $2.99{\pm}0.85$ppm of copper in duck was an exceptional case. According to the age some species showed small range of variation centering on macrominerals and there was no remarkable change in microminerals. Distribution of minerals was different according to the part and the variation was very diverse compared with other factors such as age and sex. Additionally, the content of minerals in muscle was higher in female than in male chicken and duck. In conclusion, the difference of the content of minerals according to the species was mainly focused on macrominerals.

• 한국패션뷰티학회지
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• 제2권2호
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• pp.93-100
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• 2004

This study is to measure the heavy metal content of permanent wave products which on marketing correctly as estimating the extent of exposure by a hair permanent wave scientifically. We would like to prevent an affair from arising health obstruction as to the heavy metal who is using those and also show the basic data for proposing the new standard. The results were as follows.: in case of the average heavy metal content for a wave type thioglycol acid ingredient includes 1.61ppm(Pb), 0.03ppm(Cd), 0.05ppm(Ni), 0.27ppm(Mn), 0.82ppm(Cu) and those were recognized the significant gap between products all the heavy metals. In case of a cysteine acid ingredient includes 0.86ppm(Pb), 0.01ppm(Cd), 0.05ppm(Ni), 0.20ppm(Mn) and 0.66ppm(Cu) and those were recognized the significant gap between products except a nickel. Straight type of permanent wave reductant includes 2.11ppm(Pb), 0.01ppm(Cd), 0.27ppm(Ni), 0.66ppm(Mn), 2.53ppm(Cu) and those were recognized the significant gap between products all the heavy metals. Permanent wave reducing agent includes 1.43ppm(Pb), 0.01ppm(Cd), 0.09ppm(Ni), 0.66ppm(Mn), 0.75ppm(Cu) and those were approved the significant gap between products except a cadmium. Exposure level of the heavy metal contents per onetime permanent waving were 242.3ppm(Pb), 2.5ppm(Cd), 17.7ppm(Ni), 89.0ppm(Mn), 174.7ppm(Cu).

• 한국환경생태학회지
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• 제29권1호
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• pp.1-6
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• 2015

In this study, the proximate composition of Pyropia dentata was compared by the analysis of minerals and amino acids that were produced at Seocheon, Chungcheongnam-do and at Wando and Jangheung, Jeollanam-do. Moisture, ash and crude proteins were analyzed using the AOAC method, and crude lipid was analyzed using the Soxhlet method, and inorganic analysis was performed using ICP-OES. Amino acid was used for the amino acid analyzer. The proximate composition analysis, moisture content, maximum values were displayed in Wando while the maximum content of ash appeared at Jangheung's Pyropia. Crude proteins was appeared at Seocheon's Pyropia and the maximum amount of crude lipid, carbohydrate was appeared in Wando's Pyropia. Inorganic analysis, calcium, potassium, magnesium, sodium, phosphorus, cobalt, chromium, copper, iron, manganese, nickel, zinc were analyzed from the Seocheon's Pyropia, however, cobalt, chromium, and nickel was not detected in Wando's Pyropia. For amino acid analysis, a total of 17 amino acids were detected: leucine, valine, aspartic acid, glutamic acid, and the amount of alanine accounted for about 57 % of total amino acids(26.1-28.7 %). The proximate composition, minerals, and amino acid of Pyropia dentata were different depending on the coastal ecological habitats.

• 한국분말재료학회지
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• 제3권1호
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• pp.49-56
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• 1996

The effect of$H_{2}/N_{2}$gas sintering atmosphere on the carbon content and mechanical properties during the metal injection molding process of carbonyl iron-nickel powder was studied. The carbon content of the specimen after debinding in the pure$N_{2}$atmosphere appeared 0.78 wt%. After showing the maximum value of 1.48 wt.% in the debinding atmosphere of 10%$H_{2}/N_{2}$gas mixture, the carbon content of the debinded specimen decreased gradually with increasing the$H_2$content in the$H_{2}/N_{2}$gas mixture. The carbon contents of the sintered specimen were 0.46~0.63wt% in Na gas atmosphere, while they appeared extremely low above 40%$H_{2}/N_{2}$gas atmosphere. The relative sintered density increased abruptly from 88~90% to 93~96% with the addition of Ni, while the density nearly unchanged above 2% Ni addition. The sintered density increased with increasing the fraction of$H_{2} in H_{2}/N_{2}$gas mixture. Tensile strength and hardness increased, and elongation decreased with increasing carbon and Ni content. In spite of high carbon content of 0.63 wt%, the superior elongation value of 10% was shown.

• 한국표면공학회지
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• 제43권4호
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• pp.165-169
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• 2010

$Ni-Al_2O_3$ nanocomposite coatings were fabricated by conventional electrodeposition technique using nickel sulfamate bath. Effect of plating parameters on electrodeposition of $Ni-Al_2O_3$ nanocomposite were studied. The properties of the nano composite were investigated by using SEM, XRD, and Vicker's microhardness test. The results demonstrated that $Al_2O_3$ incorporation in the composite coatings was found to be increased by increasing stir rate and $Al_2O_3$ content in plating bath. Microhardness of the composite coatings was also increased with increasing content of the nano particles in the plating bath. The surface morphologies of the nanocomposite coatings were found to be varied with varying pH, current densities as well as alumina content in the plating bath.

• 자원환경지질
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• 제17권1호
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• pp.17-34
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• 1984

어상천 망간광상은 조선계 홍훨리층의 돌로마이트와 삼태산층의 석회암내에 발달한 단층 파쇄대를 따라 형성된 표성산화망간광상이다. 본 산화망간광상의 하부에는 백악기 석영반암에 의하여 형성된 열수교대 내지 충진광상이 본 단충파쇄대를 따라 발달한다. 석영반암은 주성분으로 부터 계산한 노음치를 Q-K-F-PI 삼각도에 점시하면 북서단은 화강섬록암의 영역에 그리고 주암체는 화강암의 영역에 점시되고 D.I.치는 상기 북서단에서 부터 주암체쪽으로 증가한다. 따라서 이것은 마그마의 분화작용과 관계되는 것으로 보인다. 본 석영반암내 암질의 차이는 미량성분에도 반영이 되어 나타나고 있는 데 북서단에서 아연, 닉켈, 크롬, 몰리브텐의 함량이 높고 주암체에서는 동, 연의 함량이 높은 현상은 산성암과 염기성암에서 일반적으로 볼 수 있는 함량의 변화와 일치한다. 경상분지내 백악기 화강암류와 비교해 보면 동, 연, 아연, 닉켈, 크롬의 함량은 석영반암쪽이 분지내 동광상구의 화강암류보다 낮으나 동과 닉켈의 함량은 연 아연 광상구의 화강암류보다도 높은 경향을 보인다. 석회암 및 돌로마이트로 구성된 모암은 석영반암에 의한 광화작용으로 단층파쇄대에서는 망간, 연, 아연, 동등의 함량이 현저히 높고 멀어짐에 따라 감소되는 일차후생분산형태를 보인다. 토양중 미량원소의 함량은 토양의 생성조건 및 물리화학적조건과 밀접한 관계를 보이며 모암에서의 그들이 형성하는 탄산염의 용해도와도 주목할만한 관계를 보인다. 즉 난용성의 탄산염을 형성하는 미량원소는 토양중의 함량도 낮은 경향을 보인다.

• Journal of Nutrition and Health
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• 제8권1호
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• pp.39-46
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• 1975

This studies were designed to know the contents of trace element and magnesium in cereals. Twenty two kinds of cereal, 104'samples, were analyzed by atomic absorption spectrophotometer for the determination of Manganese, Iron, Magnesium, Chrome, Cupper, Nickel, Zinc, Stannous, Lead and Cadmium. The results are as follows: 1) The contents of Mn and Fe in the sesame group show highest value and next is bean group. In the rice group its content shows lowest value than other cereals. 2) In the Cr content its value is lower than other elements in cereals respectively. Cr content of sesame and bean group show higher than rice and barley group. 3) The contents of Cu and Ni in the sesame and bean group show higher value than the value of rice and barley group. Its contents of rice and barley group is almost equal in Cu and Ni. 4) For the Zn content the value of sesame group is higher than other cereals and next is bean group. In the Sn content the value of bean group shows higher one than other cereals. The contents of Zn and Sn in rice and barley group are lower than other cereals. 5) The value of Pb is almost equal to each cereal. The content of Cd in bear group and barley group show higher than other cereals and its value of rice group is equal to the value of barley group.

• The Korean Journal of Ecology
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• 제20권5호
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• pp.385-391
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• 1997

충남 광천과 홍성 일대의 사문암과 변성암 지역의 암석, 토양 및 출현빈도가 높은 대나물의 중금속 함량을 측정하여 사문암 토양의 독성화 정도와 식물체의 흡수관계를 조사하였다. Ni, Cr 및 Co는 사문암에 매우 높았으며 Zn, Sc, Mo 및 Fe 는 변성암에서 더 높았다. 사문암 풍화토에서는 Ni, Cr 및 Co가 높았으며 Zn과 Fe는 비사문암 풍화토(사문암 및 변성암 풍화토와 변성암 풍화토)에서 높았고, 토양의 중금속은 암석내의 함량보다 낮았다. 사문암 풍화토에 출현하는 대나물내 중금속 함량은 혼합 풍화토의 그것보다 높게 나타났으며, 같은 사문암 지역이라도 홍성보다 광천의 중금속 함량이 높았다. 대나물의 평균 Fe:Ni의 비율은 혼합 풍화토에서는 216이고 사문암 풍화토에서는 49였다. 대나물내 Ni, Cr, Co, Fe 및 Sc 등은 지상부보다 지하부에서 높았으며, Zn과 Mo 함량은 지상부에서 높았다. 암석과 식물체의 중금속 함량 비교 결과 식물체에서보다 암석의 중금속 함량이 높았고, 대나물에 의한 Zn의 흡수는 사문암과 변성암 지역에서 높았으며 Sc와 Fe는 사문암 지역에서 뚜렷이 높았다.

• 한국결정성장학회지
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• 제17권5호
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• pp.210-216
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• 2007

극청정 가스필터용 다공성 멤브레인을 제조하기 위해 금속산화물 분말의 in-situ한 환원/소결 공정을 이용하였다. 또한 기공도의 향상을 위해 solid pore forming agent로써 구형의 폴리머 입자를 첨가하여 금속 섬유를 사용한 멤브레인과 비슷한 52%의 기공도를 가지는 니켈 멤브레인을 제조하였다. 제조된 니켈 멤브레인은 폴리머의 첨가에 따라 평균기공크기와 기공도가 증가하였다. 한편 환원/소결 온도가 $800^{\circ}C$에서 $1000^{\circ}C$로 상승함에 따라 평균기공크기와 기공도는 감소하였다. 이는 환원/소결 온도가 상승함에 따라 격자확산 및 입계확산이 진행되어 멤브레인의 수축률 증가를 일으켰기 때문이다.

• 공업화학
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• 제8권6호
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• pp.927-933
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• 1997

알칼리형 연료전지용 라니니켈 수소극에서 카본블랙이 전극 성능 및 촉매층 구조에 미치는 영향을 전기화학적 방법과 질소 흡착법등을 이용하여 조사되었다. 본 연구에서 라니니켈 수소극 촉매층의 최적 카본블랙 함량은 2wt% 였다. 카본블랙의 첨가는 한계전류밀도를 증가시켰으며, 이는 기액접촉면적의 증가에 기인한 것으로 사료된다. 또한 한계전류밀도에서의 속도결정단계는 수소가 기액접촉면에서녹는 단계일 가능성이 높은 것으로 조사되었다.