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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.
Maxwelle-Wagner polarization in grain boundary segregated NiCuZn ferrite
R.A. Mondal,B.S. Murty,V.R.K. Murthy 한국물리학회 2014 Current Applied Physics Vol.14 No.12
The present work investigates the polarization response in polycrystalline Ni0.9yCuyZn0.1Fe1.98O4d (y ¼ 0, 0.1, 0.2, 0.3, 0.4, 0.5) ferrite synthesized by solidestate reaction method. X-ray diffraction analysis confirmed cubic spinel phase formation in the calcined samples. Sintered samples contain a continuous network of CuO-rich segregation along the grain boundaries for y 0.2. Dielectric spectra showed a relaxation peak for y 0.2 in the frequency range of 1 kHze1 MHz. This relaxation has been explained based on MaxwelleWagner polarization considering two-layer model in connection with two heterogeneous dielectric media.
Different 2D materials based polyetherimide mixed matrix membranes for CO2/N2 separation
Ashwin R. Kamble,Chetan M. Patel,Z.V.P. Murthy 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Keeping the global warming and climate change issues in mind, various efforts are being taking placeworldwide to separate/capture CO2 fromflue gas mixture in order to reduce its emission in theatmosphere. Therefore, in this work, we improve the gas transport properties of polyetherimide (PEI)membrane for CO2/N2 separation by embedding three differentfillers of two-dimensional materials suchas graphene oxide (GO), molybdenum disulfide (MoS2), and hexagonal boron nitride (h-BN) in its matrix. Additionally, the effect of different weight fraction (0.5,1.5, and 2.5 wt.%) of thesefillers on the CO2/N2 gasseparation performance have been investigated. Membrane morphology, variation in the chemical bondsand membrane surface roughness were observed by employing Field Emission Gun Scanning ElectronMicroscopy (FEG-SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Atomic Force Microscopy(AFM) analysis. Results obtained from the gas permeation showed that PEI embodied with GO exhibitedhigher gas permeation compared to when embodied with h-BN and MoS2. However, the maximumseparation was achieved with MoS2 particles.
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.
Suresh, K.,PoornachandraRao, Nannapaneni V.,Murthy, K.V.R. Techno-Press 2014 Advances in materials research Vol.3 No.4
$Ce^{4+}$, $Eu^{3+}$, $Tb^{3+}$ co-doped $Ca_3Si_3O_8F_2$ phosphor was synthesized via solid state reaction method using $CaF_2$, $CaCO_3$ and $SiO_2$ as raw materials for the host and $Eu_2O_3$, $CeO_2$, and $Tb_4O_7$ as activators. The luminescent properties of the phosphor was analysed by spectrofluorophotometer at room temperature. The effect of excitation wavelengths on the luminescent properties of the phosphor i.e. under near-ultraviolet (nUV) and visible excitations was investigated. The emission peaks of $Ce^{4+}$, $Eu^{3+}$, $Tb^{3+}$ co-doped $Ca_3Si_3O_8F_2$ phosphor lays at 480(blue band), 550(green band) and 611nm (red band) under 380nm excitation wavelength, attributed to the $Ce^{4+}$ ion, $Tb^{3+}$ ion and $Eu^{3+}$ ions respectively. The results reveal that the phosphor emits white light upon nUV (380nm) / visible (465nm) illumination, and a red light upon 395nm / 535nm illumination. RE ions doped $Ca_3Si_3O_8F_2$ is a promising white light phosphor for LEDs. The emission colours can be seen using Commission international de l'eclairage (CIE) co-ordinates. A single host phosphor emitting different colours under different excitations indicates that it is a potential phosphor having applications in many fields.
K.Venkateswarlu,B.S.R Murthy,V.V Subbarao 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.2
Performance, combustion and emission results of the diesel engine fueled with biodiesel blends with cetane improver as additive are presented in this paper. Cetane improver Ethyl Hexyl Nitrate (EHN) as 0.5% and 1% by volume is added as an additive to diesel-biodiesel blends. Experiments were conducted on a single cylinder, four stroke, and naturally aspirated, direct injection diesel engine with the said fuels using Exhaust Gas Recirculation (EGR) to analyze the performance, combustion and emissions. Experimental results reveal that both cylinder pressure and Heat Release Rate (HRR) decreased with increase in blend percentage and EGR as well. With increase in EHN percentage, CO and HC emissions decreased considerably while NOx decreased marginally. Smoke increases with increase in both EHN and EGR, however, at a particular EGR, blends with cetane improver present the better performance with improved emissions.
Fracture properties of concrete using damaged plasticity model -A parametric study
J.S. Kalyana Rama,D.R. Chauhan,M.V.N Sivakumar,A. Vasan,A. Ramachandra Murthy 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.1
The field of fracture mechanics has gained significance because of its ability to address the behaviour of cracks. Predicting the fracture properties of concrete based on experimental investigations is a challenge considering the quasi-brittle nature of concrete. So, there is a need for developing a standard numerical tool which predicts the fracture energy of concrete which is at par with experimental results. The present study is an attempt to evaluate the fracture energy and characteristic length for different grades of concrete using Concrete Damage Plasticity (CDP) model. Indian Standard and EUROCODE are used for the basic input parameters of concrete. Numerical evaluation is done using Finite Element Analysis Software ABAQUS/CAE. Hsu & Hsu and Saenz stress-strain models are adopted for the current study. Mesh sensitivity analysis is also carried to study the influence of type and size of elements on the overall accuracy of the solution. Different input parameters like dilatation angle, eccentricity are varied and their effect on fracture properties is addressed. The results indicated that the fracture properties of concrete for various grades can be accurately predicted without laboratory tests using CDP model.
Shim, J.,Venkata Reddy, Ch.,Sarma, G.V.S.S.,Narayana Murthy, P.,Ravikumar, R.V.S.S.N. Pergamon 2015 Spectrochimica acta. Part A, Molecular and biomole Vol.142 No.-
A simple co-precipitation method has been used for the synthesis of Co<SUP>2+</SUP> and Ni<SUP>2+</SUP>-doped zinc borate nanopowders. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV/Vis absorption, Scanning electron microscope (SEM) with EDS and photoluminescence (PL) spectroscopies techniques has been employed for their characterization. Powder X-ray diffraction data reveals that the crystal structure belongs to monoclinic for both as-prepared samples. SEM images showed surface morphology of the prepared samples. Optical absorption spectra showed the characteristic bands of doped ions in octahedral site symmetry. From the optical absorption data crystal field and inter-electronic repulsion parameters are evaluated. The FT-IR spectra showed the characteristic vibrational bands related to ZnO, BO<SUB>3</SUB> and BO<SUB>4</SUB> molecules. Photoluminescence spectra exhibited the emission bands in ultraviolet and blue regions.