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Mohammed, B.S.,Ibrahim, R.,Perumal, N.,Rao, K.S. Rama The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.1
This paper analyses the power flow of a three-feeder/multi-bus distribution system by a custom Generalized Power Quality Conditioner (GUPQC). The GUPQC has been realized by three voltage source converters (VSCs) coupled back-to-back through a common DC-link capacitor on the DC-side. One feeder was controlled by the shunt compensator, whereas each of the other two feeders was controlled by the proposed novel series compensator. The GUPQC has the capability to simultaneously compensate voltage and current quality problems of a multi-bus/three-feeder distribution system. Besides that, the power can be transferred from one feeder to other feeders to compensate for poor power quality problems. Extensive simulation studies were carried out by using MATLAB/SIMULINK software to establish the ability of the GUPQC to improve power quality of the distribution systems under distorted supply voltage conditions.
B. S. Mohammed,R. Ibrahim,N. Perumal,K. S. Rama Rao 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.1
This paper analyses the power flow of a three-feeder/multi-bus distribution system by a custom Generalized Power Quality Conditioner (GUPQC). The GUPQC has been realized by three voltage source converters (VSCs) coupled back-to-back through a common DC-link capacitor on the DC-side. One feeder was controlled by the shunt compensator, whereas each of the other two feeders was controlled by the proposed novel series compensator. The GUPQC has the capability to simultaneously compensate voltage and current quality problems of a multi-bus/three-feeder distribution system. Besides that, the power can be transferred from one feeder to other feeders to compensate for poor power quality problems. Extensive simulation studies were carried out by using MATLAB/SIMULINK software to establish the ability of the GUPQC to improve power quality of the distribution systems under distorted supply voltage conditions.
N. J. Suthan Kissinger,NATARAJAN VELMURUGAN,K. Perumal 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.4
Zinc-Selenide (ZnSe) thin films were prepared by using physical vapor deposition under a vacuum of 5 × 10−6 Torr by using an electron beam evaporated technique at different substrate temperatures, RT, 100, 200, and 300 ˚C. X-ray diffraction analysis (XRD) indicates that the films are polycrystalline, having a f.c.c zincblende structure irrespective of their substrate temperature. All the films show preferred orientation along the (1 1 1) plane parallel to the substrates. The microstructural parameters, such as the lattice constant, crystallite size, stress, strain, and dislocation density, are calculated, and the effect of substrate temperature on the deposited films was discussed. The grain size of the deposited ZnSe films is observed to be small and is within the range of 12 to 32 nm, and the grain size is observed to be increase from 12.5 to 31.9 nm with increasing substrate temperature. Optical measurements indicate the existence of a direct-bandgap-allowed optical transition with a corresponding energy gap in the range of 2.95 – 2.70 eV. Zinc-Selenide (ZnSe) thin films were prepared by using physical vapor deposition under a vacuum of 5 × 10−6 Torr by using an electron beam evaporated technique at different substrate temperatures, RT, 100, 200, and 300 ˚C. X-ray diffraction analysis (XRD) indicates that the films are polycrystalline, having a f.c.c zincblende structure irrespective of their substrate temperature. All the films show preferred orientation along the (1 1 1) plane parallel to the substrates. The microstructural parameters, such as the lattice constant, crystallite size, stress, strain, and dislocation density, are calculated, and the effect of substrate temperature on the deposited films was discussed. The grain size of the deposited ZnSe films is observed to be small and is within the range of 12 to 32 nm, and the grain size is observed to be increase from 12.5 to 31.9 nm with increasing substrate temperature. Optical measurements indicate the existence of a direct-bandgap-allowed optical transition with a corresponding energy gap in the range of 2.95 – 2.70 eV.
Lone, N.,Cheong, I. W.,Cho, M.,Hong, Y. K.,Choi, Y. S.,Perumal, S.,Oh, B. T.,Joo, J. Springer Science + Business Media 2017 Journal of coatings technology and research Vol.14 No.3
<P>Synthesis of an eco-friendly and efficient antibacterial and antifouling coatings is presented by exploiting urushiol, a natural varnishing material. Since urushiol has inherent outstanding surface-protecting and antimicrobial properties, a series of poly (methyl methacrylate)-urushiol polymer compositions were prepared and fabricated into films. The prepared films were subjected to antimicrobial and antifouling studies. The polymer systems were characterized by various physico-spectroscopic techniques such as H-1 NMR, Fourier transform infrared spectroscopy, differential scanning calorimetry, atomic force microscopy, and thermal gravimetric analysis. The confocal laser scanning micrographs, obtained for Pseudomonas aeruginosa biofilm formation, demonstrated an excellent antimicrobial response of the urushiol-incorporated polymers against this bacterial strain. We also demonstrated an inhibitory attachment effect against Navicula incerta, a fouling microalgal strain.</P>
J. Suthagar,N. J. Suthan Kissinger,G. M. Sharli Nath,K. Perumal 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.1
ZnSe1−xTex films with different tellurium (Te) contents were deposited by using an electron beam(EB) evaporation technique onto glass substrates for applications to optoelectronic devices. Thestructural and the optical properties of the ZnSe1−xTex films were studied in the present work. The host material ZnSe1−xTex, were prepared by using the physical vapor deposition method ofthe electron beam evaporation technique (PVD: EBE) under a pressure of 1 × 10−5 mbar. TheX-ray diffractogram indicated that these alloy films had cubic structure with a strong preferentialorientation of the crystallites along the (1 1 1) direction. The optical properties showed that theband gap (Eg) values varied from 2.73 to 2.41 eV as the tellurium content varied from 0.2 to 0.8. Thus the material properties can be altered and excellently controlled by controlling the systemcomposition x.
R Sambath Kumar,T Sivakumar,V Senthil,N Venkateswara Murthy,V Balasubramaniam,R Kanaga Sabi,R. Shanmuga Sundram,P Perumal,U K Mazumder,M Gupta 경희대학교 융합한의과학연구소 2008 Oriental Pharmacy and Experimental Medicine Vol.8 No.2
The methanol extract of stem barks of Careya arborea Roxb. (MECA) (Family- Myrtaceae) was evaluated for antitumor activity and antioxidant status against Ehrlich’s Ascites Carcinoma (EAC) bearing Swiss albino mice. After 24 h of tumor inoculation the MECA was administered at the doses of 50, 100 and 200 mg/kg body weight/mice/day for 14 days. After the last dose and 18 h fasting mice were sacrificed. The effect of MECA on the growth of transplantable murine tumor, life span of EAC bearing hosts, hematological profiles, serum and liver biochemical parameters were estimated. The MECA showed significant (P < 0.01) decrease in ascites volume, packed cell volume and viable cell count and prolonged the life span of EAC tumor bearing mice. Hematological profiles reverted to more or less normal levels in extract treated mice. The MECA also produced protective effect by decreasing the activity of serum enzymes, bilirubin and increase the protein and uric acid levels. MECA significantly (P < 0.05) decreased the levels of lipid peroxidation, while significantly (P < 0.05) increased the levels of glutathione content, vitamin C, vitamin E, superoxide dismutase and catalase CAT. The results indicate that MECA exhibited significant antitumor and antioxidant activity in EAC bearing mice. The methanol extract of stem barks of Careya arborea Roxb. (MECA) (Family- Myrtaceae) was evaluated for antitumor activity and antioxidant status against Ehrlich’s Ascites Carcinoma (EAC) bearing Swiss albino mice. After 24 h of tumor inoculation the MECA was administered at the doses of 50, 100 and 200 mg/kg body weight/mice/day for 14 days. After the last dose and 18 h fasting mice were sacrificed. The effect of MECA on the growth of transplantable murine tumor, life span of EAC bearing hosts, hematological profiles, serum and liver biochemical parameters were estimated. The MECA showed significant (P < 0.01) decrease in ascites volume, packed cell volume and viable cell count and prolonged the life span of EAC tumor bearing mice. Hematological profiles reverted to more or less normal levels in extract treated mice. The MECA also produced protective effect by decreasing the activity of serum enzymes, bilirubin and increase the protein and uric acid levels. MECA significantly (P < 0.05) decreased the levels of lipid peroxidation, while significantly (P < 0.05) increased the levels of glutathione content, vitamin C, vitamin E, superoxide dismutase and catalase CAT. The results indicate that MECA exhibited significant antitumor and antioxidant activity in EAC bearing mice.
Hajjaj H. M. Abdu-Allah,Bahaa G. M. Youssif,Mostafa H. Abdelrahman,Mohammed K. Abdel-Hamid,Rudraraju Srilakshmi Reshma,Perumal Yogeeswari,Tarek Aboul-Fadl,Dharmarajan Sriram 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.2
The antitubercular drug; para-aminosalicylicacid (PAS) was used as the core scaffold for the design of aseries of 1H-1,2,3-triazolylsalicylhydrazones upon couplingwith triazole and arylhydrazone moietis to furnish asingle molecular architecture. The obtained derivativeswere screened against Mycobacterium tuberculosis H37Rvrevealing good to high activity for the active compounds(MIC values of 0.39–1.5 lg/mL) compared to the marketeddrugs isoniazid, rifampicin and ethambutol. Moreover, themost active analogue N-(1-(4-chlorobenzyl)-2-oxoindolin-3-ylidene)-2-hydroxy-4-(4-phenyl-1H-1,2,3-triazol-1-yl)-benzohydrazide (20) was found to be ten-fold more potentthan PAS and equipotent to rifampicin (MIC 0.39 lg/mL),while exhibiting low cytotoxicity with a selectivity indexof[128. In addition, this compound was shown to beactive against persistent forms of mycobacteria comparableto standard drugs in nutrient starvation model. Accordingly,we introduce compound 20 as a valuable lead forfurther development. A 3D-QSAR study was also conductedto help in explaining the observed activity and toserve as a tool for further development.
Kumar, R Sambath,Sivakumar, T,Senthil, V,Murthy, N Venkateswara,Balasubramaniam, V,Sabi, R Kanaga,Sundram, R. Shanmuga,Perumal, P,Mazumder, U K,Gupta, M Kyung Hee Oriental Medicine Research Center 2008 Oriental pharmacy and experimental medicine Vol.8 No.2
The methanol extract of stem barks of Careya arborea Roxb. (MECA) (Family- Myrtaceae) was evaluated for antitumor activity and antioxidant status against Ehrlich's Ascites Carcinoma (EAC) bearing Swiss albino mice. After 24 h of tumor inoculation the MECA was administered at the doses of 50, 100 and 200 mg/kg body weight/mice/day for 14 days. After the last dose and 18 h fasting mice were sacrificed. The effect of MECA on the growth of transplantable murine tumor, life span of EAC bearing hosts, hematological profiles, serum and liver biochemical parameters were estimated. The MECA showed significant (P < 0.01) decrease in ascites volume, packed cell volume and viable cell count and prolonged the life span of EAC tumor bearing mice. Hematological profiles reverted to more or less normal levels in extract treated mice. The MECA also produced protective effect by decreasing the activity of serum enzymes, bilirubin and increase the protein and uric acid levels. MECA significantly (P < 0.05) decreased the levels of lipid peroxidation, while significantly (P < 0.05) increased the levels of glutathione content, vitamin C, vitamin E, superoxide dismutase and catalase CAT. The results indicate that MECA exhibited significant antitumor and antioxidant activity in EAC bearing mice.