• 한국세라믹학회지
• /
• 제30권9호
• /
• pp.740-746
• /
• 1993

TiO2-SnO2 fine powders prepared by coprecipitation from TiCl4-SnCl4 aqueous solution, and their crystal structures were studied. All the TiO2-SnO2 fine powders calcined at 180~$700^{\circ}C$ showed the complete solid solution between TiO2(rutile structure) and SnO2(rutile structure). This crystal structure of TiO2-SnO2 powders is thought to be originated mainly from the heterogeneous nucleation of Ti-hydroxde on the Sn-hydroxide with coherent structure.

• 한국분말재료학회지
• /
• 제7권2호
• /
• pp.85-92
• /
• 2000

The Cu55Ti45 system was effectively mechanically-alloyed using a pulverizer. Noncrystallinities of the powders were characterized by TEM, X-ray and DSC. The amorphous powders were consolidated without losing their noncrystallinities. The consolidating conditions keeping a non-crystalline were obtained by building a TTT diagram of the amorphous powders. The microhardness of the crystallite and bulk amorphous alloys are also compared.

• 한국세라믹학회지
• /
• 제28권5호
• /
• pp.353-358
• /
• 1991

Fine powders of the 2212 superconducting phase of bismuth system have been prepared directly from solution using ultrasonic spray pyrolysis. The fine superconducting powders produced by pyrolysis were characterized for the size, shape, and crystalline phase by SEM and XRD. The pyrolysis temperature, flow rate of the carrier gas, residence time of the droplets greatly influenced the size, shape, and crystalline phase. The optimum temperature and flow rate of the carrier gas for the preparation of fine powders of the 2212 superconduting phase were found to be 830$^{\circ}C$and 3ι/min, respectively.

• 한국세라믹학회지
• /
• 제28권3호
• /
• pp.205-214
• /
• 1991

Calcium carbonate fine powders were synthesized by blowing CO2 gas in CaO or Ca(OH)2 suspension, and the shapes of powders obtained were examined for each synthetic condition. When water was used as a solvent, ultrafine calcite powders with the average size of∼0.03$\mu\textrm{m}$ were obtained. When synthesized using methanol as a solvent, amorphous phase and spherical vaterite phase were obtained by suction filtering and non-filtering, respectively. Reaction did not occured in ethanol medium, but spherical vaterite phase was obtained by adding ethylene glycol in ethanol.

• 한국분말야금학회:학술대회논문집
• /
• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
• /
• pp.451-452
• /
• 2006

The influence of Hi-flux powders characteristics on the performance of magnetic powder cores was studied. It was found that different cooling rate and nozzle configuration could change the shape and microstructure of powders. Smooth surface and spherical shape of powders were beneficial to improve DC bias performance and reduce core losses of magnetic powder core.

• 한국식품조리과학회지
• /
• 제20권2호
• /
• pp.126-132
• /
• 2004

늙은 호박분말을 첨가한 기능성 식빵을 개발하기 위해 밀가루(강력분)에 100 mesh체로 분리한 늙은 호박분말을 1%, 2%, 4%, 8%의 비율로 혼합하여 식빵을 제조한 후 이화학적, 물리적 특성을 조사하였다. 늙은 호박분말의 일반성분은 수분 6.47%, 조회분 5.49%, 조단백질 9.38%의 비율이었고, 늙은 호박분말을 첨가한 식빵의 수분함량은 42.22∼44.39% 수준으로 호박분말의 첨가량이 증가할수록 증가하였으며, 수분활성도(0.528∼0.576) 역시 높아지는 경향이었다. 비용적은 늙은 호박분말의 첨가량이 1%에서 8%로 증가함에 따라 비용적은 감소하였으나, 중량은 증가하는 경향이었다. 또한, 보수력은 첨가량이 증가할수록 증가하는 경향이었다. 기계적 색도 중 명도 L값과 적색도 a값이 늙은 호박분말의 첨가량이 증가할수록 그 값이 감소하였고, 황색도인 b값은 무첨가군 ＋12.65보다 호박분말 첨가군이 ＋29.44∼＋45.58로 매우 높은 값을 나타내었다. 기계적 조직감 중 굳기는 호박분말의 첨가량이 증가함에 따라 무첨가군에 보다 단단하였고, 호박분말 8% 첨가군이 561g으로 무첨가군 248g보다 단단하였다. 관능평가에서는 색은 4% 호박분말첨가군이 3.91로, 단맛은 4%와 8% 호박분말첨가군이 각각 4.55로 조직감은 무첨가군과 1% 호박분말첨가군에서 각각 3.36으로, 전체적인 기호도의 경우는 4% 호박분말첨가군이 3.64로 가장 높은 관능점수를 얻었다. 따라서, 위의 결과를 종합해 볼 때 식빵의 제조에 있어 늙은 호박분말의 첨가량은 4%으로 수준으로 첨가함이 호박분말 특유의 색과 맛을 가미한 새로운 호박분말이 적절하게 첨가된 식빵을 제조할 수 있으리라 생각된다.

• 한방비만학회지
• /
• 제12권1호
• /
• pp.33-47
• /
• 2012

Objectives This study was designed to investigate the effects of fermented soybean upon anti-inflammation, cytotoxicity, antioxidant and intestinal mucous membrane permeability by measuring the cell viability, NO (nitric oxide) production, DPPH, Polyphenol, HRP and TEER in cells like Raw 264.7 and HCT 116 using fermented soybean. Methods Raw 264.7 cell and HCT 166 cell were used in this study. And fermented soybean powders were used for the experimental group and soybean powders for the control group. There was inflammation response upon using lipopolysaccharide(LPS). Fermented soybean powders and soybean powders were in a respectively different dose added to the cells with LPS. MTT assay, NO, DPPH and Polyphenol measurement, TEER, HRP were conducted for each cell. The results of this study were presented in mean and standard deviation. Results 1. In Raw 254.7 cells added with $100{\mu}l/ml$ unfermented soybean powders, 104.95% higher than 62.59% was measured. In Raw 254.7 cells added with $100{\mu}l/ml$ fermented soybean powders, there was 74.90% measured higher than 62.59%, which was a significant result. 2. By a gradual increase of unfermented soybean powders like $0.1{\mu}l/ml$, $1.0{\mu}l/ml$, $10{\mu}l/ml$, $100{\mu}l/ml$, the measured NO were also gradually decreased $53.12{\mu}M$, $47.57{\mu}M$, $37.02{\mu}M$, $28.16{\mu}M$. In case of cells added with fermented soybean powders, $43.95{\mu}M$ NO was measured in $0.1{\mu}l/ml$ which is significant, and in other cases, mostly measured over$ 56.72{\mu}M$. 3. It was inferred that fermented soybean powders have anti-inflammatory effects of maintaining intestinal mucous membrane permeability because the measured values of cells in both groups were all higher than $133.62{\Omega}$ measured of cells added with only LPS. And measured values of cells in both groups were all lower than 2.26 measured of cells added with only LPS. 4. In case of experiment DPPH and polyphenol measurement, fermented group was all higher than unfermented group. Conclusion From the results of conducting MTT assay, NO measurement, and TEER, HRP by using cells Raw 264.7 and HCT-116, even though there was no significance in the correlation between cytotoxicity, anti-inflammatory effects, both unfermented soybean powders and fermented soybean powders were shown to have intestinal mucous membrane permeability improvement effects. This effects could be applicable for autoimmune diseases, chronic inflammatory diseases and so additional studies are expected in the future. From the results of conducting DPPH, Polyphenol measurement, Fermented soybean may be useful as potential antioxidant.

• 한국산림과학회지
• /
• 제52권1호
• /
• pp.31-36
• /
• 1981

The infrared specta of wood powders have been recorded both in the untreated stste and after treatment through 1%-NaOH extraction(2hrs) and alcohol-benzene mixture extraction. Differences between the spectra of 3 species(Pinus densiflora, Populus alba x glandulosa and Quercus mongolica) can be explained chiefly in terms of theirs chemical compositions through comparisions of the spectra of pure cellulose powders. 1. The peak near $3400cm^{-1}$ from wood powders appeared at $3420cm^{-1}$, which was shifted to left compared with pure cellulose powders. 2. Many new peaks appeared at 2725, 1730, 1660, 1640, 1600, 1510, 1500, 1460, 1385, 1270, 830 and $810cm^{-1}$ etc., which were not appeared in pure cellulose powders. 3. Pinus densiflora spectra of untreated powders showed small peak appeared at $2840cm^{-1}$, which was the most characteristic band. There were peaks at $1240cm^{-1}$ in Populus alba x glandulosa and Quercus mongolica spectra of untreated wood powders. 4. Treated wood powder spectra showed weak or no peaks at near $1730cm^{-1}$ and also at near $2920cm^{-1}$. $2840cm^{-1}$, near $1385-1365cm^{-1}$, near $1235cm^{-1}$ and $1110-1095cm^{-1}$ etc. 5. The Alcohol-benzene extractive spectrum from Pinus densiflora showed many peaks at $3600-2300cm^{-1}$, $3100-2800cm^{-1}$, $1700cm^{-1}$, $1450cm^{-1}$ and $1375cm^{-1}$ etc. The most characteristic band of the extractives appeared at $3100-2900cm^{-1}$.

• Journal of Acupuncture Research
• /
• 제27권2호
• /
• pp.105-113
• /
• 2010

Objectives : This study was performed to analyze the quality of Ojeok-san extract powders distributed in Korea. Methods : HPLC analyses of Ojeok-san decoction produced in laboratory and 8 kinds of Ojeok-san extract powders were done. Also, quantity analyses of paeoniflorin in Paeonia lactiflora, Glycyrrhizin in Glycyrrhiza uralensis, alkaloid in Ephedra sinica, Hesperidin in Citrus unshiu Markovich, and cinnamic acid in Cinnamomum cassia Blume were performed to investigate the accurate content of 6 kinds of Ojeok-san extract powders. Results : In the pattern analysis, the peaks were compared. The content of components in herbal extract powders was 14.7 to 15.8% of that of decoction in average. The range was measured from 8.5 to 25.7%. The pattern comparison showed significant differences among the pharmaceutical companies' products. As for the quantity analysis, one of herbal extract powder contained insufficient amount of Paeonia lactiflora components and one of herbal extract powder was in short of Ephedra sinica components. All of the others contained more than standard component(over 90%). Conclusions : Because herbal extract powders are also medicine, standardized manufacturing methods and consistent quality management are necessary. Therefore exaction and operation of national standards and various researches to improve the quality management of herbal extract powders is urgent.

• 한국분말재료학회지
• /
• 제12권3호
• /
• pp.201-207
• /
• 2005

Nickel powders were synthesized by the hydrazine reduction of nickel chloride solution containing ammonia in DEA solutions. The size distribution of nickel powders were investigated as a function of ammonia concentration, hydrazine concentration and the mixed composition ratio of diethanolammine (DEA) and triethanolammine (TEA). Nickel powders with the size in submicron range were obtained at $185^{\circ}C$ for 45 minutes by hydrazine reduction of nickel chloride solution in DEA solutions. The hydrazine concentrations showed significant effects on the particle size and shape distribution of nickel powders under $NH_3/Ni^{2+}$ molar ratio of 2.0 condition. As the mixed volume ratio of TEA and DEA increased, nickel powders with relatively larger particle size and low agglomeration were obtained. Nickel powders with particle size in the ranged from 0.4 to $0.9\;{\mu}m$ were obtained at the 50 $vol.%$ of TEA.