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RISS 인기검색어
- 검색키워드
- 저자 : ( N. Subba Reddy ) (검색결과 6 건)
- 무료
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Montmorillonite Clay Catalyzed Three Component, One-Pot Synthesis of 5-Hydroxyindole Derivatives
Reddy, B.V. Subba,Reddy, P. Sivaramakrishna,Reddy, Y. Jayasudhan,Bhaskar, N.,Reddy, B. Chandra Obula Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
A highly efficient and environmentally benign protocol has been developed for the first time to produce a wide range of biologically active 5-hydroxyindole derivatives using montmorillonite KSF clay as a reusable solid acid catalyst. The use of recyclable clay makes this procedure quite simple, more convenient and cost-effective.
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Synthesis and Physical Characterization of -Fe2O3 and (+ )-Fe2O3 Nanoparticles
P. Bhavani,N. Ramamanohar Reddy,I. Venkata Subba Reddy 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.2
Magnetic nanoparticles were synthesized at different hydrothermal temperatures (HT; 100, 130, 160 and 190 C) by using a facile hydrothermal route combined with a subsequent calcination process. The calcined materials were analyzed for phase, microstructure, and magnetic and dielectric properties through different characterization techniques. The structural analyses revealed that the material prepared at a HT of 100 C and sequentially calcined at 300 C for 3 h showed a high degree of the maghemite structure. On the other hand calcined materials showed a small additional peak belonging to the hematite structure. FESEM micrographs of the materials calcined at HT, of 100 C and 190 C showed spherical-like nanoparticles with diameters in range 30 - 54 nm. Materials prepared at a HT of 160 C followed by calcination at 300 C for 3 h exhibited the highest saturation magnetization, Ms = 67 emu/g, with a lower coercivity; all materials were in a single domain state. A high dielectric constant (105.54) was observed for the calcined material that had been prepared at a HT of 130 C. The dielectric properties of synthesized materials showed an almost frequency- independent behavior.
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Montmorillonite Clay Catalyzed Three Component, One-Pot Synthesis of 5-Hydroxyindole Derivatives
B. V. Subba Reddy,P. Sivaramakrishna Reddy,Y. Jayasudhan Reddy,N. Bhaskar,B. Chandra Obula Reddy 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
A highly efficient and environmentally benign protocol has been developed for the first time to produce a wide range of biologically active 5-hydroxyindole derivatives using montmorillonite KSF clay as a reusable solid acid catalyst. The use of recyclable clay makes this procedure quite simple, more convenient and cost-effective.
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Localization of lung abnormalities on chest X-rays using self-supervised equivariant attention
Gavin D’Souza,N. V. Subba Reddy,K. N. Manjunath 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.1
Chest X-Ray (CXR) images provide most anatomical details and the abnormalities on a 2D plane. Therefore, a 2D view of the 3D anatomy is sometimes sufficient for the initial diagnosis. However, close to fourteen commonly occurring diseases are sometimes difficult to identify by visually inspecting the images. Therefore, there is a drift toward developing computer-aided assistive systems to help radiologists. This paper proposes a deep learning model for the classification and localization of chest diseases by using image-level annotations. The model consists of a modified Resnet50 backbone for extracting feature corpus from the images, a classifier, and a pixel correlation module (PCM). During PCM training, the network is a weight-shared siamese architecture where the first branch applies the affine transform to the image before feeding to the network, while the second applies the same transform to the network output. The method was evaluated on CXR from the clinical center in the ratio of 70:20 for training and testing. The model was developed and tested using the cloud computing platform Google Colaboratory (NVidia Tesla P100 GPU, 16 GB of RAM). A radiologist subjectively validated the results. Our model trained with the configurations mentioned in this paper outperformed benchmark results.
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( A. Geetha Bhavani ),( N. Subba Reddy ) 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.4
Zeolite HY is wet impregnated with Ni (0.1, 0.3, 0.4, 0.5 wt%), Pt (0.1 wt%) and reduced in presence of hydrogen to form nanosized particles of Ni and Pt. All the catalysts were characterized by XRD, TEM, ESCA, NH<sub>3</sub>-TPD, Pyridine adsorbed FT-IR and BET. Characterization results confirm that the Ni and Pt fractions effectively rehabilitated the physio-chemical properties of the zeolite HY catalysts. Further, all the reduced catalyst were screened with hydroisomerization of m-xylene at LHSV = 2.0 h-1 in the temperature range 250-400 ºC in steps of 50 ºC in hydrogen atmosphere (20 ml/g). The addition of Ni to Pt catalyst increases hydroisomerization conversion, as well as maximizes p-xylene selectivity by restricting the pore size. The increasing trend in activity continues up to 0.3 wt% of Ni and 0.1 wt% Pt addition over zeolite HY. The increasing addition of Ni increases the total number of active metallic sites to exposed, which increases the metallic sites/acid sites ratio towards the optimum value for these reactions by better balance of synergic effect for stable activity. The rate of deactivation is pronounced on monometallic catalysts. The results confirm the threshold Ni addition is highly suitable for hydroisomerization reaction for product selectivity over Ni-Pt bimetallic/support catalysts.
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Jamwal, Hem Suman,Kumari, Sapana,Chauhan, Ghanshyam S.,Ahn, Jou-Hyeon,Subba Reddy, N. Elsevier 2016 Journal of environmental chemical engineering Vol.4 No.2
<P><B>Abstract</B></P> <P>Large surface area, high porosity and good mechanical strength are some of the attributes of the polymer–inorganic hybrid materials those make these attractive candidates for use as adsorbents. New silica/titania–based polymer–inorganic hybrid material was synthesized via the sol–gel process. While SiO<SUB>2</SUB> and TiO<SUB>2</SUB> were used as the inorganic components, poly(2–Hydroxypropyl methacrylate) was used as the polymeric component. The material was well characterized by FTIR, SEM, TEM and BET. The synthesized hybrid material was used as adsorbent for the removal of Cu(II) ions from their aqueous solutions. Parametric study of the factors affecting adsorption was carried out to find the optimum adsorption conditions. Different kinetic and isotherm models applied show that the adsorption best follows pseudo–second order kinetics and Langmuir isotherm. The maximum adsorption capacity of the HPMA/SiO<SUB>2</SUB>/TiO<SUB>2</SUB> hybrid material was found to be 192.23mgg.<SUP>−1</SUP> In order to see the validity of the experimental procedure and results obtained, artificial neuron network model was employed to predict the adsorption capacity values following the experimental adsorption parametric frame. There is a close agreement with the experimental and the predicted values as very high values of R<SUP>2</SUP> of 0.99957 and 0.99961 were obtained for the predicted vs. experimental values with training and testing data set.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New HPMA/SiO<SUB>2</SUB>/TiO<SUB>2</SUB> hybrids were synthesized by sol-gel process. </LI> <LI> Synthesized materials were used as Cu(II) adsorbents following a parametric framework. </LI> <LI> Materials exhibited high maximum adsorption capacity of 192.23mgg <SUP>−1</SUP> under optimum conditions. </LI> <LI> ANN model was employed to validate the experimental adsorption capacity values. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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