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- 저자 : Subrahmanyam Ch (검색결과 4 건)
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Prime $L$-fuzzy filters of a semilattice
Ch. Santhi Sundar Raj,B. Subrahmanyam,U. M. Swamy 원광대학교 기초자연과학연구소 2020 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.20 No.1
In this paper, we study the notion of prime $L$-fuzzy filter of a bounded distributive semilattice S with truth values in a frame $L$. A characterization theorem of prime (maximal) $L$-fuzzy filters of $S$ is established and, the set of all prime $L$-fuzzy filters of $S$ is topologized and the resulting space is discussed.
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Chandana L.,Ray Debjyoti,Subrahmanyam Ch 한국물리학회 2022 Current Applied Physics Vol.36 No.-
An atmospheric-pressure plasma jet (APPJ) was directly irradiated at a gas-liquid interface under ambient conditions. The reactive oxygen species (ROS) like hydroxyl radicals (•OH), hydrogen peroxide (H2O2) and ozone (O3) and also reactive nitrogen species (RNS) such as nitrogen oxides (NOx) and nitric acid (HNO3) formed during the plasma discharge were quantified under various experimental parameters. In a chemical dosimetry method, terephthalic acid (TA) was employed for the quantification of •OH and titanium sulfate was used to quantify the H2O2. Quantitative determination of NO3 − was carried out by using Ion chromatography (IC). The changes in the solution pH were studied during the plasma treatment. Strong acidification along with the production of dominant reactive nitrogen species and ozone formation were observed with air. The effect of various gases, gas flow rate, various applied voltage and catalyst were studied to optimize the experimental conditions for the best performance. The influence of catalyst Fe2+ salt, TiO2 on the formation of reactive species were studied. The efficiency of the plasma device for the degradation of crystal violet (CV) was also investigated with TiO2 and Fe2+ salt.
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ZSM-5 위에 지지된 Heteropolyacid 하에서 Methacrylic acid와 Ethylene glycol의 에스테르화 반응
Prabhakarn, A.,Fereiro, J.A.,Subrahmanyam, Ch. Korean Chemical Society 2011 대한화학회지 Vol.55 No.1
methacrylic acid과 ethylene glycol과의 에스테르화 반응을 ZSM-5에 지지된 heteropolyacids [HPA: $H_4SiW_{12}O_{40}$(STA)와 $H_3PW_{12}O_{40}$(PTA)] 하에서 수행하였다. 비교를 위하여, 지지하지 않은HPA, $H_2SO_4$, $BF_3$와 PTSA 하에서 같은 반응을 수행하였다. 연구한 촉매 중에서, HPA는 $H_2SO_4$, $BF_3$와 PTSA와 비교하여 더 좋은 활성을 보여주었다. 촉매 활성을 HPA지지 ZSM-5 촉매와 비교하였는데, 그 결과 ZSM-5위에 지지된 30 wt% PTA는 bulk PTA와 거의 같은 활성을 나타내었다. 이 반응은 methacrylic acid에 관하여 1차 속도 법칙을 따랐으며, 반응 생성물은 $^1H$-NMR과 FT-IR을 이용하여 확인하였다. Esterification of methacrylic acid with ethylene glycol was carried out over Heteropolyacids [HPA: $H_4SiW_{12}O_{40}$ (STA) and $H_3PW_{12}O_{40}$ (PTA)] supported on ZSM-5. For comparison, the same reaction was carried out over unsupported HPA, $H_2SO_4$, $BF_3$ and PTSA. Among the catalysts studied, HPA showed better activity compared to $H_2SO_4$, $BF_3$ and PTSA. Catalytic activity was compared with HPA supported ZSM-5 catalysts. Typical results indicated that 30 wt% PTA supported on ZSM-5 showed nearly the same activity as that of bulk PTA. It was found that the reaction follows first order kinetics with respect to methacrylic acid. The reaction products were identified by $^1H$-NMR and FT-IR.
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Esterification of Methacrylic acid with Ethylene glycol over Heteropolyacid supported on ZSM-5
A. Prabhakarn,J. A. Fereiro,Ch. Subrahmanyam 대한화학회 2011 대한화학회지 Vol.55 No.1
Esterification of methacrylic acid with ethylene glycol was carried out over Heteropolyacids [HPA: H_4SiW_(12)O_(40) (STA)and H_3PW_(12)O_(40) (PTA)] supported on ZSM-5. For comparison, the same reaction was carried out over unsupported HPA, H_2SO_4,BF_3 and PTSA. Among the catalysts studied, HPA showed better activity compared to H_2SO_4, BF_3 and PTSA. Catalytic activity was compared with HPA supported ZSM-5 catalysts. Typical results indicated that 30 wt% PTA supported on ZSM-5 showed nearly the same activity as that of bulk PTA. It was found that the reaction follows first order kinetics with respect to methacrylic acid. The reaction products were identified by ^1H-NMR and FT-IR.
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