• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.07b
• /
• pp.1204-1207
• /
• 2003

BiSrCaCuO superconducting thin films have been fabricated by co-deposition using IBS(ion Beam Sputtering) method. Despite setting the composition of thin film Bi2212 or Bi2223, in both cases, Bi2201, Bi2212 and Bi2223 phase were appeared. It was confirmed the obtained field of stabilizing phase was represented in the diagonal direction of the right below end in the Arrhenius plot of temperature of the substrate and $PO_3$, and it was distributed in the rezone.

• Proceedings of the KSME Conference
• /
• 2001.11b
• /
• pp.468-474
• /
• 2001

The shock process represents an abrupt change in fluid properties, in which finite variations in pressure, temperature, and density occur over a shock thickness which is comparable to the mean tree path of the gas molecules involved. The fluid phenomenon is simulated by using finite difference lattice Boltzmann method (FDLBM). In this research, the new model is proposed using the lattice BGK compressible fluid model in FDLBM for the purpose of shortening in calculation time and stabilizing in simulation operation. The numerical results agree also with the theoretical predictions.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.3 no.2
• /
• pp.37-41
• /
• 1979

In order to obtain tasic information for solvent dyeing, polyethylene terephthalate (PET) films was pretreated with water, tetrachloroethylene (TCE) and water/TCE emulsion for three hours at $140^{\circ}C$ for stabilizing the substrate. By film roll cyliderical method, Disperse Red 60, Disperse Yellow 42, and Disperse Blue 27 were diffused in the films and examined dyeing properties. The results are summarized as follows; 1) Diffusion coefficient increases in the order, waterTCE>water/TCE 2) A linear relationship between diffusion coefficient and shrinkage was Observed 3) The temperature dependence of the diffusion coefficient can't be expressed by WLF equation.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1994.11a
• /
• pp.160-163
• /
• 1994

Tungsten and Tungsten Nitride thin films deposited by RF and DC sputtering and the resistivity of these films was measured. We deposited tungsten and tungsten nitride films by RF and DC sputtering at various conditions and derived equations that determines the resistivity and sheet resistivity by stabilizing the basic theory. We investigated properties of the resistivity and sheet resistivity of theme films under various conditions like temperature of substrate, flow rate of the argon gas and content of nitrogen from nitrogen-argon mixtures

• Journal of the Korean Applied Science and Technology
• /
• v.27 no.2
• /
• pp.99-106
• /
• 2010

We have investigated the rheological behaviours of emulsions containing polymers. The polymers used in this study were polyacrylamide and carboxy vinyl polymer. The emulsion with polyacrylamide shows better prior preference than that with carboxy vinyl polymer on the skin texture. In the toxicity test, such as, LLNA cell toxicity, skin organ culture and human patch test, polyacrylamide was the appropriate materials for the cosmetics. The viscosity of polyacrylamide shows maximum value in neutral pH and good stability against temperature. The decreasing effect of viscosity against salt was not good enough but showed a better result than that of carboxy vinyl polymer. Two times the amount of polyacrylamide should be used for the formation of a similar viscosity of carboxy vinyl polymer. Yield value of polyacrylamide was low and the effect for the stabilizing emulsions was also low.

• Journal of Powder Materials
• /
• v.2 no.1
• /
• pp.36-43
• /
• 1995

Rapidly solidified and mechanically alloyed Al-Ti base alloys were prepared by gas atomization and attritor milling separately. The gas atomized and the mechanically alloyed powders were consolidated after preheating at $450^{\circ}C$, and then heat treated isochronally for 1 hour to observe the microstructures and to investigate the mechanical properties. Stable phases of precipitates in the Al-Ti-Si and the Al-Ti-Zr alloys were identified as DO22-$(Al,Si)_3Ti$ and $Do_{23}-Al_3(Ti, Zr)$ each. Among the alloys, the mechanically alloyed Al-l0Ti-2Si alloy showed superior thermal stability and mechanical properties at elevated temperature. The additions of third elements, such as Si and Zr, to Al-Ti alloys seemed to improve the mechnical properties remarkably by stabilizing the microstructure and the precipitate phases in the consolidated alloys.

• Preventive Nutrition and Food Science
• /
• v.5 no.1
• /
• pp.1-6
• /
• 2000

The binding capacity of chitin and chitosan to anthocyanin pigmentss isolated from purple perilla leaves was inves-tigated. The pigment binding capacity increased with increasing pigment concentrations and decreasing pH without being affected by reaction temperature and particle sizes. Regression analysis revealed significantly high corre-lations between pigment binding capacity of chitin and chitosan and pigment concentration at ranges of 25-100 mg of pigment/g of sample, After 1 hr settling, release of pigment from pigmented chitin and chitosan increased with increasing pH, up to 24.9% and 17.4%, respectively, at pH 9. In general, pigment binding capacity of chitosan was higher than that of chitin. There results suggest that chitosan may be useful as a potential adsorbent capable of stabilizing anthocyanin pigment.

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.26 no.12
• /
• pp.2032-2038
• /
• 1989

Single mode optical fiber interferometeric sensors using phase tracking homodyne detection are typically susceptible to environmentally indured temperature fluctuations and other types of disturbances. A simple and effective phase tracking feedback electronic circuit for compensator is described to achieve stabilizing signal output, maximum sensitivity and linearity in the fiber optic Mach-Zehnder infterferometer in the presence of differential phase drift. The phase tracking range of the piezoelectric cyclinder in the reference arm is \ulcorner.7 \ulcornerad and the prabe mass about 1 gram in the sensing arm was used for measurements of the gravity acceleration.

• Journal of Ocean Engineering and Technology
• /
• v.13 no.1 s.31
• /
• pp.121-129
• /
• 1999

Double-diffusive convection with verical temperature and concentration gradients in thermally stratified fluids has been investigated experimentally using an electrochemical technique. Cupric sulfuric-sulffuric acid solution confined between two horizontal copper electrodes was used. The change of thermal and solutal buoyance has no influence on the range of voltage for the limiting current. Due to Soret effect, the onset time of natural convection is delayed as the stabilizing thermal buoyancy decreases. Also it is found that the shrinkage of the unstabilizing solutal buoyancy makes the onset of natural convection retard. Multi-layered convective phenomena do not appear because cupric sulfate-sulfuric acid solution is thermally stratified, and heat diffuses faster than cupric sulfate solfate solution.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.11a
• /
• pp.583-586
• /
• 2003

BiSrCaCuO superconducting thin films have been fabricated by co-deposition using the faraday cup. Despite setting the composition of thin film Bi2212, Bi(2201, 2212, 2223) phase were appeared. It was confirmed the obtained field of stabilizing phase was represented in the diagonal direction of the right below end in the Arrhenius plot of temperature of the substrate and $PO_3$, and it was distributed in the rezone.