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B. Sivakumar,S. Gokul Raj,G. Ramesh Kumar,R. Mohan 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
Single crystals of lithium potassium phthalate (LiKP) were successfully grown from aqueous solution by solvent evaporation technique. The grown crystals were characterized by single crystal X-ray diffraction. The lithium potassium phthalate C16 H12 K Li3 O11 belongs to triclinic system with the following unit-cell dimensions at 298(2) K; a = 7.405(5) Å; b = 9.878(5) Å; c = 13.396(5) Å; α = 71.778(5)°; β = 87.300(5)°; γ = 85.405(5)°; having a space group P1. Mass spectrometric analysis provides the molecular weight of the compound and possible ways of fragmentations occurs in the compound. Thermal stability of the crystal was also studied by both simultaneous TGA/DTA analyses. The UV-Vis-NIR spectrum shows a good transparency in the whole of Visible and as well as in the near IR range. Third order nonlinear optical studies have also been studied by Z-scan technique. Nonlinear absorption and nonlinear refractive index were found out and the third order bulk susceptibility of compound was also estimated. The results have been discussed in detail.
Sivakumar, B.,Raj, S. Gokul,Kumar, G. Ramesh,Mohan, R. Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
Single crystals of lithium potassium phthalate (LiKP) were successfully grown from aqueous solution by solvent evaporation technique. The grown crystals were characterized by single crystal X-ray diffraction. The lithium potassium phthalate $C_{16}\;H_{12}\;K\;Li_3\;O_{11}$ belongs to triclinic system with the following unit-cell dimensions at 298(2) K;$a=7.405(5){\AA}$;$b=9.878(5){\AA}$;$c=13.396(5){\AA}$;${\alpha}=71.778(5)^{\circ}$;${\beta}=87.300(5)^{\circ}$;${\gamma}=85.405(5)^{\circ}$; having a space group P1. Mass spectrometric analysis provides the molecular weight of the compound and possible ways of fragmentations occurs in the compound. Thermal stability of the crystal was also studied by both simultaneous TGA/DTA analyses. The UV-Vis-NIR spectrum shows a good transparency in the whole of Visible and as well as in the near IR range. Third order nonlinear optical studies have also been studied by Z-scan technique. Nonlinear absorption and nonlinear refractive index were found out and the third order bulk susceptibility of compound was also estimated. The results have been discussed in detail.
CAPACITY ASSESSMENT OF A WINDOW AIR-CONDITIONER RETROFITTED WITH A REFRIGERANT MIXTURE
M. HERBERT RAJ,D. MOHAN LAL,D. B. JABARAJ 대한설비공학회 2011 International Journal Of Air-Conditioning and Refr Vol.19 No.1
R22 being a HCFC is to be phased out soon as per the Montreal protocol. This paper presents the experimental performance study of an air-conditioner retrofitted with M20 (a refrigerant mixture of R407C, R600a and R290 in the mass fraction 80:10.96:9.04 respectively). M20 is considered as a substitute for R22 in window air-conditioners with mineral oil as the compressor lubricant. Previously, the performance of the same mixture has been reported with 19% extra condenser length as compared to that in the R22 system. In this study, experiments were conducted in a 5.25 kW window airconditioner to assess the potential of M20 as a retrofit refrigerant without making any system alteration other than changing the capillary. The system performance study was carried out with R22 and later with the M20 charge in a psychrometric test facility as per BIS and ASHRAE standards. Experimental results showed that with the M20, the system had 4.18% to 7.47% lower cooling capacity with respect to that of R22. The COP for the M20 refrigerant was lower, in the range of 0.58% to 7.78% than that of R22. Hence, M20 can be used as a drop- in-substitute for R22 in window air-conditioners but with a marginal reduction in cooling capacity.
Sundara Sekar, B.,Mohan Raj, S.,Seol, E.,Ainala, S.K.,Lee, J.,Park, S. Pergamon Press ; Elsevier Science Ltd 2014 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.39 No.28
Carbon monoxide (CO) is highly toxic but is an abundant carbon source that can be utilized for the production of hydrogen (H<SUB>2</SUB>). CO-dependent H<SUB>2</SUB> production is catalyzed by a unique enzyme complex composed of carbon monoxide dehydrogenase (CODH) and CO-dependent hydrogenase (CO-H<SUB>2</SUB>ase), both of which contain metal cluster(s). In this study, CODH and the required maturation proteins from the novel facultative anaerobic bacterium Citrobacter amalonaticus Y19 were cloned and heterologously expressed in Escherichia coli. For functional expression of CODH in E. coli, only CooF (ferredoxin-like protein) and CooS (CODH), not the maturation proteins, were needed. The recombinant E. coli BL21(DE3)-cooFS showed a 3.5-fold higher specific CODH activity (4.9 U mg protein<SUP>-1</SUP>) compared to C. amalonaticus Y19 (Y19) (1.4 U mg protein<SUP>-1</SUP>). Purified heterologous CODH from the soluble cell-free extract of the recombinant E. coli showed a specific activity of 170.6 U mg protein<SUP>-1</SUP>. Recombinant E. coli harboring Y19 CODH and maturation proteins did not produce H<SUB>2</SUB> from CO, suggesting that the native hydrogenases present in E. coli could not substitute the Y19 CO-H<SUB>2</SUB>ase for CO-dependent H<SUB>2</SUB> production.