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Recently, several research groups has started extensive research on Sr₂Nb₂O_(7) (SNO)- Sr₂Ta₂O_(7) (STO) binary solid solution. As it may be suitable for non- volatile memory devices such as ferroelectric gate field effect transistor . Ferroelectric Sr₂ (Nb1- xTax )₂O_(7) (SNT O) thin films were prepared by sol- gel process . Sol- gel derived stock solutions were spin- coated onto either Pt/ T i/ SiO₂/ Si(100) or Pt/T iO₂/ SiO₂/ Si(100) substrate. After multiple coating/ baking steps, dried films were annealed for crystallization and densification at 850℃ for 24hour s in flowing oxygen. Form IR and NMR analyses of stock solutions, it was revealed that acetic acid is most effective to stabilize solutions during solution preparation steps. From the study, it was found that the film remains ferroelectric regardless of x values, i.e. molra ratio between SNO and STO compounds. This is not in agreement with published single crystall data, where the cryst al with x values exceeding 0.88 is non- ferroelectric. This rather contradictory looking result may indicate the effect of residual stress in this films , which is often existent due to thermal expansion mismatch with underlying substrat e. Remanent polarization value, which si important for ferroelctric memory applications , was the highest when the x value of the film was 0.7. Leakage current and relative permittivity (εr ) values were typically about 10^(-8) ∼ 10^(-7)A/ ㎠, and 30 at 1MHz, respectively . Remanent polarization (2P_(r) ) and coercive field(E_(c) ) values of Sr₂ (Nb_(0.3)Ta_(0.7) )O_(7) film were 0.5 μC/ ㎠, and 17 kV/ ㎝, respectively, when ±3V triangular pulse was applied.
Microencapsulated phenacetin were prepared by coacervation of aqueous Cellulose Acetate Phthalate(C.A.P) solutions. Appropriate solutions were made by dissolving C.A.P. in an equivalent concentration of Disodium hydrogen phosphate. The C.A.P. shells are plasticized by imbibition with 5% Glycerol solution and that dissolution rate determined in 0.1N Hydrochloric acid solution containing 0.4% sodium lauryl sulfate. As a result, plasticized microencapsulated phenacetin during 2 minutes, 5 minutes and 8 minutes correlated between dissolution rate and plasticizing time in microcapsules. Plasticized microencapsulated phenacetin during 12 minutes and 15 minutes was not correlated between dissolution rate and plasticizing time in microcapsules. And the other, microcapsuies were dyed with Methylene blue solution. As a result, nonmicroencapsulated phenacetin was not dyed. but microencapsulated phenacetin was dyed with Methylene blue solution.
The effects of antacids on the bioavailability of Scopolamine Hydrobromide and l-Hyscyamine were studied in rabbits. The plasma concentration of Scopolamine and l-Hyocsyamine were determined by selected ion monitoring in GC/MS(Scopolamine ; m/z= 138, l-Hyoscyamine; m/z=124). Biphasic elimination was shown by intravenous injection. The AUC of Scopolamine and l-Hyoscyamine was increased as 1.2∼1.3 times by the oral coadministration with antacids. The stability of Scopolamine and l-Hyoscyamine in artificial gastric juicewas increased by antacids, the degradation of Scopolamine and l-Hyoscyamine in the artificial intestinal juice and the optimal pH condition (pH 7.4) was accelerated by Lipase.