• 한국주조공학회지
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• 제36권4호
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• pp.117-125
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• 2016

The effects of the Zn content on the microstructure and corrosion behavior in 1M NaCl solution were investigated in Mg-(0~6)%Zn casting alloys. The MgZn phase was scarcely observed in the Mg-1%Zn alloy, while the Mg-(2~6)%Zn alloy consisted of ${\alpha}$-(Mg) and MgZn phases. With an increase in the Zn content, the amount of the MgZn phase was gradually increased. Immersion and electrochemical corrosion tests indicated that the Mg-1%Zn alloy had the lowest corrosion rate among the alloys, and a further increase in the Zn content resulted in the deterioration of the corrosion resistance. Microstructural examinations of the corroded surfaces and EIS analyses of surface corrosion films revealed that the best corrosion resistance at 1%Zn was associated with the absence of MgZn phase particles in the microstructure and the contribution of Zn element to the formation of a protective film on the surface. A micro-galvanic effect by the MgZn particles led to the increased rate of corrosion at a higher Zn content.

• 한국식품영양과학회지
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• 제28권1호
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• pp.16-21
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• 1999

Taurine content was determined by HPLC equipped with RF detector in commercial milks, meats, edible viscera, ham, sausage, fishes and shellfishes, mollusca and crustacea. Taurine contained 1.06~1.57mg/100g in milks, 37.9~169.8mg/100g in lean meats, 11.3~192.4mg/100g in viscera, 45.0~109.1 mg/100g in ham, 11.7~26.0mg/100g in sausage, 31.6~431.9mg/100g in fishes, 125.9~1078.8mg/100g in shellfishes, 340.2~ 1305.6mg/100g in mollusca and 79.3~316.5mg/100g in crustacea. Webfoot octopus had the highest content of 1,306mg/100g, followed by small ark shell(1,079mg/100g), little neck clam (868mg/100g), hard shelled mussel(852mg/100g) and beka squid(734mg/100g).

• 한국가스학회지
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• 제16권6호
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• pp.1-6
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• 2012

Mg-Al합금 분진의 마그네슘 성분 비율이 분진폭발특성에 미치는 영향을 알기 위하여 Siwek 20 L 구형 분진폭발시험장치를 사용하여 농도를 변화시키면서 실험적으로 조사하였다. 이를 위하여 체적평균입경이 $151{\sim}160{\mu}m$의 Mg-Al합금 분진을 사용하였다. 그 결과 Mg-Al합금에서의 Mg성분의 증가는 폭발하한농도의 감소와 최대폭발압력의 증가로 나타났다. 또한 Mg-Al합금의 최대폭발압력과 최대폭발압력상승속도는 주로 분진 농도에 의존하였다. 그러나 Mg-Al (40:60 wt%), Mg-Al (50:50 wt%) 및 Mg-Al (60:40 wt%)의 폭발지수(Kst)에 있어서, 마그네슘 성분의 증가에 따라서 폭발지수가 증가함을 알 수 있었다.

• 한국세라믹학회지
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• 제31권11호
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• pp.1299-1306
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• 1994

Effect of MgO content on microstructural evolution and microwave dielectric properties of Ba(Mg1/3Ta2/3)O3 system was investigated. MgO content was varied from 10 mol% deficiency to 10 mol% excess of stoichiometric composition, respectively. It was found that MgO-deficient specimen showed faster grain growth rate than stoichometric and MgO excess BMT system. Besides, sandwich type precipitates of Ba5Ta4O15 which was formed within the BMT grain, might lead to the anisotropic grain growth of BMT grain. On the contrary, in MgO excess specimen, BMT grain growth rate was retarded by precipitations of MgO phase in grain boundary. Besides, the Q values of MgO-deficient showed lower than MgO-excess due to precipitations of Ba5Ta4O15 within BMT grain.

• 한국표면공학회지
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• 제32권6호
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• pp.695-702
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• 1999

We have explored the factors affecting the resistivity of Cu (Mg) alloy, which was prepared by sputtering. The results show that the resistivity is a function of Mg content, annealing temperature, annealing time, and Cu-alloy thickness. Addition of Mg to copper increases the resistivity through solute scattering. In addition, increasing Mg content promotes the interfacial reaction between Mg and SiO$_2$ to produce the free silicon and the generated free silicon dissolves into copper, resulting in a significant increase of resistivity. Furthermore, increasing oxidation temperature rapidly decreases the resistivity at the initial stage of oxidation and then continues to increase the resistivity to the saturation value with increasing oxidation time. The saturation value depends on the residual Mg content and the thickness of the alloy. TEM and AES analyses reveal that dense, uniform MgO grows to the limiting thickness of about $150\AA$. However, interfacial MgO does not show the limiting thickness, instead continues to grow until Mg is completely exhausted. From these facts, we proposed the maximum available Mg content needed to from the dense MgO on the surface and suppress the excessive interfacial reaction.

• 대한한의학회지
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• 제18권1호
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• pp.470-479
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• 1997

In order to determine the effect of Sopungchukdamtang experimental studies were performed in Hyperlipidemia Rats. The contents of serum Total cholesterol, Triglyceride, Free fatty acid, Phospholipid, HDL-cholesterol and LDL-cholesterol were measured The results were summarized as follows; 1. The content of Total cholesterol in the serum compared with control group tended to be decreased in Sopungchukdamtang(34mg/l00g) group, but did not show a significance. Sopungchukdamtang (17mg/l00g) group showed a significant value. 2. The content of Triglyceride in the serum compared with control group tended to be decreased in Sopungchukdamtang(17mg/l00g) group and Sopungchukdamtang(34mg/l00g) group, but did not show a significance. 3. The content of Free fatty acid in the serum was significantly decreased in Sopungchukdamtang(17mg/l00g) group and Sopungchukdamtang(34mg/l00g) group. 4. The content of Phospholipid in the serum compared with control group tended. to be decreased in Sopungchukdamtang(34mg/l00g) group, but did not show a significance. Sopungchukdamtang(17mg/l00g) group showed a significant value. 5. The content of HDL-cholesterol in the serum compared with control group tended to be increased in Sopungchukdamtang(17mg/l00g) group, but did not show a significance. Sopungchukdamtang(34mg/l00g) group showed a significant value. 6. The content of LDL-cholesterol in the serum compared with control group tended to be decreased in Sopungchukdamtang(34mg/l00g) group, but did not show a significance. Sopungchukdamtang(17mg/100g) group showed a significant value. According to the above results, it is assumed that Sopungchukdam-tang has a valid effect on Hyperlipidemia.

• Journal of Plant Biotechnology
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• 제32권2호
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• pp.139-144
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• 2005

본 연구는 기내 배양한 나도 풍란에 식물생장억제제인 Uniconazole, Ancymidol, Paclobutrazol의 종류별, 농도별 처리가 식물체내 내생 GA 유사물질의 활성 및 ABA 유사물질의 함량의 변화에 미치는 영향을 알아보기 위하여 실시되었다. 지상부인 잎에서는 Uniconazole 0.05 mg/L, Ancymidol 0.1 mg/L, Paclobutrazol 0.3 mg/L 처리 시 ABA 유사물질의 함량은 대조구보다 낮았으며, GA유사물질의 활성은 대조구 보다 높거나 비슷한 수준이었다. 하지만 처리농도가 높아짐에 따라 ABA 유사물질의 농도는 높아졌으나, GA 유사물질의 활성은 비교적 억제되었다. 지하부인 뿌리에서는 Uniconazole 0.05, 0.2mg/L, Ancymidol 0.2 mg/L, Paclobutrazol 0.1 mg/L 처리에서 ABA 유사물질의 함량이 대조구보다 낮았고, 그 이상의 농도에서는 높았다. GA 유사물질의 활성은 비교적 저 농도에서는 높았으나, 고농도 처리에서는 저 농도와 비교하여 활성이 억제되었다.

• 한국식품영양과학회지
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• 제33권5호
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• pp.905-910
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• 2004

과잉생산된 참외를 효율적으로 이용하기 위해 참외주스 제조공정에서 중요한 변수로 작용하는 가열온도 및 가열시간을 달리하면서 제조한 참외 착즙액에 대한 이화학적 품질변화를 측정하였다. 착즙액을 가열 후 여과시간을 측정한 결과 가열온도가 98.57$^{\circ}C$일 때, 가열시간이 11.29min일 때 가장 낮은 여과시간인 55.53 sec를 나타내었다. 참외 농축액 제조를 위한 최적 열처리 조건은 가열온도 98$^{\circ}C$로, 가열시간 13 min으로 처리하는 것이 우수하였다. Pectin분해효소 처리를 하면서 청징화 실험을 행한 결과 탁도가 가장 낮은 조건은 pectin분해효소의 함량 4.40 mg%, gelatin 함량 39.72 mg% 및 효소반응시간이 24.09 min일 때였으며, 갈색도가 가장 낮은 조건은 pectin분해효소의 함량 9.33 mg%, gelatin의 함량 44.70 mg% 및 효소반응시간이 115.56 min일 때였다. 참외 농축액 제조를 위해서는 pectin분해효소는 6.6 mg%, gelatin은 33.6 mg% 첨가하여 70 min 처리하는 것이 바람직함을 알 수 있었다.

• The Korean Journal of Ceramics
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• 제6권1호
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• pp.68-73
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• 2000

The effects of oxygen annealing on the carbon content in MgO thin films were investigated, MgO thin films were deposited on Si(100) substrate at different temperatures of 400 to $700^{\circ}C$ and different deposition rates of 3.4 to 11.6$\AA$/min. Using rf magnetron sputtering method. Carbon content change on the surface of MgO thin films with the oxygen annealing at different temperatures was investigated using various method. The carbon content decreased as the annealing temperature increased. $Pb(Zr_{0.53}Ti_{0.47})O_3$(PZT) thin films were deposited on the MgO/Si(100) substrates. The effects of carbon content on the phase formation and the electrical properties of PZT thin films were also investigated.

• 한국식품저장유통학회지
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• 제10권4호
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• pp.534-539
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• 2003

본 연구는 뜰보리수의 영양성분 및 생리활성 물질의 조사 및 기능성 식품의 개발에 대한 연구의 일환으로 완숙된 열매의 영양성분을 분석하였다. 뜰보리수의 수분함량은 82.34%이었고, 탄수화물, 조단백질, 조지방 및 회분의 함량은 각각 15.4, 1.29, 0.79, 0.54%이었다. 과즙의 pH와 적정산도는 각각 3.29, 0.64%이었으며, 당도는 14.0 Brix이었다. 환원당과 총당의 함량은 각각 1.03, 3.27 g/100g이었고, 수용성단백질의 함량은 0.48g/100g이었으며, 폴리페놀의 함량은 0.28g/100g이었다. 유리당인 glucose와 fructose의 함량은 각각 401.96, 370.34 mg/100g으로 대부분을 차지하였고, 총 유리당의 함량은 781.44mg/100g이었다. 유기산인 citric, malic, succinic acid의 함량은 각각 265.01, 18.16, 8.50 mg/100g이었고, 총 유기산의 함량은 294.44mg/100g이었다. 유리아미노산중에서는 serine과 alanine의 함량이 각각 13.93, 13.16mg/100g으로 가장 많았고, 다음으로 aspartic acid, cystine, methionine등이 비교적 높은 함량을 보였다. Phosphoetolamine, $\beta$-alanine의 함량은 각각 13.93, 13.16mg/100g으로 높았다. 그리고 총 아미노산 및 유사물질의 함량은 94.13mg/100g이었다. 환원형 비타민 C의 함량은 131.35mg/100g이었고, 산화형 비타민 C의 함량은 431.37mg/100g이었다. 무기질 성분 중에 칼륨, 마그네슘, 나트륨의 함량이 각각 1627.44, 140.28, 56.70mg/100g으로 높게 분석되었다.