http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Synthesis of New 8-Formyl-4-methyl-7-hydroxy Coumarin Derivatives
Manidhar, D.M.,Rao, K. Uma Maheswara,Reddy, N. Bakthavatchala,Sundar, Ch. Syama,Reddy, C. Suresh Korean Chemical Society 2012 대한화학회지 Vol.56 No.4
8-Formyl-4-Methyl-7-Hydroxy Coumarin Derivatives were synthesized via Penchem condensation followed by Duffs reaction. Treatment of this with N,N-di substituted cyano acetamides in the presence of piperdine afforded New 8-Formyl-4-Methyl-7-Hydroxy Coumarin Derivatives (7a-o). Their structures were characterized by IR, $^1H$ and $^{13}C$ NMR and Mass spectral and elemental analysis data.
EIGENVALUE PROBLEMS FOR SYSTEMS OF NONLINEAR HIGHER ORDER BOUNDARY VALUE PROBLEMS
A. K. Rao,S. N. Rao 한국전산응용수학회 2010 Journal of applied mathematics & informatics Vol.28 No.3
Values of the parameter are determined for which there ex-ist positive solutions of the system of boundary value problems, u(n) +λp(t)f(ν) = 0,ν(n) + λq(t)g(υ) = 0, for t ∈ [a,b], and satisfying, u(i)(a) =0, υ(a)(b) = 0, v(i)(a) = 0, ν(α)(b) = 0, for 0 ≤ i ≤ n-2 and 1 ≤ α ≤ n-1(but fixed). A well-known Guo-Krasnosel’skii fixed point theorem is ap-plied.
Laccase- and Peroxidase-Free Tyrosinase Production by Isolated Microbial Strain
( Sambasiva Rao K. R. S. ),( N. K. Tripathy ),( Y. Mahalaxmi ),( R. S. Prakasham ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.2
Laccase- and peroxidase-free tyrosinase has commercial importance in the production of L-3, 4-dihydroxyphenylalanine (L-DOPA), which is mainly used in the treatment of Parkinson`s disease. In the present study, isolation of an actinomycetes microbial strain capable of producing only tyrosinase is reported. Among all soil isolates, three individual colonies revealed black color around the colony in the presence of tyrosine. Further screening for laccase and peroxidase activities using syringaldazine denoted that one of the isolates, designated as RSP-T1, is laccase and peroxidase negative and produces only tyrosinase. The microbe was authenticated as Streptomyces antibioticus based on 16S ribotyping. Effective growth of this isolate was noticed with the use of medium (pH 5.5) containing casein acid hydrolysate (10.0 g/l), K2HPO4 (5.0 g/l), MgSO4 (0.25 g/l), L-tyrosine (1.0 g/l), and agar (15 g/l). The scanning electron micrograph depicted that the microbe is highly branched and filamentous in nature. The enzyme production was positively regulated in the presence of copper sulfate. The impact of different fermentation parameters on tyrosinase production depicted that the maximized enzyme titer values were observed when this isolate was grown at 6.5 pH and at 30oC temperature under agitated conditions (220 rpm). Among all the studied physiological parameters, agitation played a significant role on tyrosinase production. Upon optimization of the parameters, the yield of tyrosinase was improved more than 100% compared with the initial yield.
D. Narendar,N. Arjun,K. Someshwar,Y. Madhusudan Rao 한국약제학회 2016 Journal of Pharmaceutical Investigation Vol.46 No.3
The aim of the investigation was to develop and optimize the effervescent floating matrix tablets of Quetiapine Fumarate (QF) by using 23 factorial design. Amount of hydroxyl propyl methyl cellulose K4M (HPMC K4M (A1)), amount of hydroxyl propyl methyl cellulose K15M (HPMC K15M (A2)) and amount of sodium bicarbonate (A3) (as gas-generating agent) were considered as independent variables and floating lag time (FLT, B1) (sec), percent drug release in 2 h (B2, Q2) and 6 h (B3, Q6) as dependent variables, respectively. Floating tablets of QF were prepared by effervescent technique using direct compression method. Drug-excipient compatibility studies were conducted by using DSC and FTIR techniques. The floating tablets were evaluated for physical characteristics, drug content, swelling index, in vitro buoyancy and in vitro release studies. Optimized formulation contains 25 mg of A1, 12.5 mg of A2 and 25 mg of A3 which resulted in 32 s of B1, 32.89 ± 3.1 % of B2, and 73.61 ± 1.8 % of B3, respectively. DSC and FTIR studies revealed that no interaction between the drug and excipients in the developed formulation. The drug release followed Higuchi model and the Fickian transport. Physico-chemical stability studies revealed that the optimized formulation was stable for 90 days. Based on the physical evaluation and in vitro drug release characteristics, it was concluded that QF was suitable for incorporation into a floating drug delivery system.
D. Sreekantha Reddy,강병원,유성초,Y. Dwarakanadha Reddy,S.K. Sharma,K.R. Gunasekhar,K.N. Rao,P. Sreedhara Reddy 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Nanostructured Zn1-xMnxS films (0 ≼ x ≼ 0.25) were deposited on glass substrates by simple resistive thermal evaporation technique. All the films were deposited at 300 K in a vacuum of 2 × 10-6 m bar. All the films temperature dependence of resistivity revealed semiconducting behaviour of the samples. Hot probe test revealed that all the samples exhibited n-type conductivity. The nanohardness of the films ranges from 4.7 to 9.9 GPa, Young’s modulus value ranging 69.7–94.2 GPa.
Sreekantha Reddy, D.,Kang, B.,Yu, S.C.,Dwarakanadha Reddy, Y.,Sharma, S.K.,Gunasekhar, K.R.,Rao, K.N.,Sreedhara Reddy, P. Elsevier 2009 Current Applied Physics Vol.9 No.2
Nanostructured Zn<SUB>1-x</SUB>Mn<SUB>x</SUB>S films (0=<x=<0.25) were deposited on glass substrates by simple resistive thermal evaporation technique. All the films were deposited at 300K in a vacuum of 2x10<SUP>-6</SUP>m bar. All the films temperature dependence of resistivity revealed semiconducting behaviour of the samples. Hot probe test revealed that all the samples exhibited n-type conductivity. The nanohardness of the films ranges from 4.7 to 9.9GPa, Young's modulus value ranging 69.7-94.2GPa.
Experimental investigation of Wheeler's hardening model for Pusan clays
Chung, S.G.,M. Suneel,K.N. Prasad,Rao, K.G. 東亞大學校建設技術硏究所 2004 硏究論文集 Vol.28 No.1
The present paper adopts Wheeler's model (1997) to evaluate its application to Pusan clays. A program of triaxial and consolidation tests on samples of Pusan clays at Yangsan, Korea was under taken to investigate the applicability of the model adopted. The model parameters are evaluated by describing the initial state of the soil. Model predictions are shown to be qualitatively consistent with experimental observations, but refinement seems to be required to have much better agreement between experimental results and model predictions.
Reshmi Maity,N. P. Maity,Srinivasa Rao Karumuri,Girija Sravani,K. Guha 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
The output acoustic energy of a capacitive micromachined ultrasonic transducer (CMUT) can be enhanced by adjusting its membrane structure. In this paper three dissimilar membranes shapes of CMUT: circular, rectangular and hexagonal, were aimed and 3D finite element method simulated using adaptive meshing technique. The displacement as well as strain and stress outputs for a single membrane and an array of four membranes on a single substrate were obtained. The simulated results are supported by analytical modeling. A static bias of 40 V and a signal of amplitude 100 mV are employed. A pressure of 8603.98 N/m 2 resulting in a force of 16.894 μN was applied at the membrane. Fixtures were provided on every possible face of the structure except the face 1 (membrane). The outcomes showed that the membrane displacement is highest for a circular geometry under same uniform pressure and area of vibration. Moreover as the distance between the elemental membranes increases the displacement decreases for circular and hexagonal membranes while the reverse behavior is observed for rectangular membranes.
Prabhakar, M. N.,Sudhakara, P.,Subha, M. C. S.,Rao, K. Chowdoji,Song, Jung Il Taylor Francis 2015 Polymer-Plastics Technology and Materials Vol.54 No.16
<P>Nanocomposite hydrogels were prepared through a blend solution of poly(lactic acid) and poly(N-isopropylacrylamide)-co-acrylamide via free radical polymerization. Plant extractions were used for the synthesis of Ag nanoparticles to study the antibacterial activity of the hydrogels. Similarly, 5-Fluorouracil drug was loaded through both in situ and ex situ methods to study thecontrolled release profiles. The nanocomposite hydrogels were characterized by ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, Thermo gravimetric analysis - Differential scanning calorimetry (TGA-DSC), X-ray diffractometer, scanning electron microscopy, and transmission electron microscope. The dissolution and the agar diffusion test were performed to evaluate the drug release and antibacterial activity, respectively. The results suggested that the fabricated nanocomposite hydrogels can be used as a promising candidate for dual functions in biomedical applications.</P>
Low Pull-in-Voltage RF-MEMS Shunt Switch for 5G Millimeter Wave Applications
P. Ashok Kumar,K. Srinivasa Rao,B. Balaji,M. Aditya,N. P. Maity,Reshmi Maity,Santanu Maity,Ameen El Sinawi,Koushik Guha,K. Girija Sravani 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
RF MEMS switches have been employed in many commercial and defense applications due to their high potentiality at microwave and millimeter wave frequencies. In this paper, an RF MEMS shunt switch is designed with perforations and without perforations and simulated using iterative meanders for millimeter wave 5G applications. The proposed iterative meander offers a low spring-constant of 0.68 N/m and reduces the pull-in-voltage upto 1.8 V. The proposed perforated switch design is more reliable which operates with less transition time of 11.2 μs with a quality factor of 1.69. The switch possesses high capacitance ratio of 63. During ON condition, the switch shows low insertion loss of − 0.24 dB at 41 GHz and high isolation of − 46.7 dB at 38 GHz. The performance of the switch is analyzed by simulating it using COMSOL Multiphysics 5.2v (FEM tool). The obtained simulation results shows close approximation with the theoretical results and the switch is efficiently used for 5G millimeter wave applications.