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Synthesis and optical characterization of porous ZnO

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Journal of Advanced Ceramics 2013年第3期2卷 260-265页

作者： k.SOWRI BABU A.RAMACHANDRA reddy Ch.SUJATHA k.venugopal reddy A.N.MALLIkA Department of Physics National Institute of Technology WarangalWarangal-506004Andhra PradeshIndia

In this paper,a simple and cheap method to prepare porous ZnO by using zinc nitrate,ethanol and triethanolamine(TEA)is *** as-prepared sample consisted of nano and micro *** sample was calcined at 300℃,400℃and 500℃with different heating *** 500℃,the nano pores disappeared but the sample maintained its micro *** emission scanning electron microscopy(FE-SEM)pictures confirmed that the size and growth of ZnO nanoparticles depended on the heating *** infrared(IR)absorption peak of Zn-O stretching vibration positioned at 457 cm^(-1)was split into two peaks centered at 518 cm^(-1)and 682 cm^(-1)with the change of *** results confirmed that Fourier transform infrared(FT-IR)spectrum was sensitive to variations in particle size,shape and *** photoluminescence(PL)spectrum of porous ZnO contained five emission peaks at 397 nm,437 nm,466 nm,492 nm and 527 *** intensity enhanced monotonously with increase of temperature and the change was rapid between temperatures of 300℃and 500℃.This was due to the elimination of organic species and improvement in the crystallanity of the sample at 500℃.

关键词： semiconductors porous ZnO optical properties

BHLM:Bayesian theory-based hybrid learning model for multi-document summarization

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第2期9卷 229-250页

作者： S.Suneetha A.venugopal reddy Computer Science and Engineering Department Hasvita Institute of Engineering and Technology Hyderabad India Jawaharlal Nehru Technological University Hyderabad India

In order to understand and organize the document in an efficient way,the multidocument summarization becomes the prominent technique in the Internet *** the information available is in a large amount,it is necessary to summarize the document for obtaining the condensed *** perform the multi-document summarization,a new Bayesian theory-based Hybrid Learning Model(BHLM)is proposed in this ***,the input documents are preprocessed,where the stop words are removed from the ***,the feature of the sentence is extracted to determine the sentence score for summarizing the *** extracted feature is then fed into the hybrid learning model for ***,learning feature,training error and correlation coefficient are integrated with the Bayesian model to develop ***,the proposed method is used to assign the class label assisted by the mean,variance and probability ***,based on the class label,the sentences are sorted out to generate the final summary of the *** experimental results are validated in MATLAB,and the performance is analyzed using the metrics,precision,recall,F-measure and *** proposed model attains 99.6%precision and 75%rouge-1 measure,which shows that the model can provide the final summary efficiently.

关键词： Multi-document text feature sentence score hybrid learning model Bayesian theory

Influence of Rotational Speed on Microstructure and Mechanical Properties of Dissimilar Metal AISI 304-AISI 4140 Continuous Drive Friction Welds

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Journal of Iron and Steel Research International 2012年第10期19卷 64-73页

作者： G Subhash Chander G Madhusudhan reddy A venugopal Rao Swarna Bharathi Institute of Science and Technology Khammam 507002APIndia Defense Metallurgical Research Laboratory Kanchanbagh 500058APIndia

Fundamental investigation of continuous drive friction welding of austenitic stainless steel (AISI 304) and low alloy steel (AISI 4140) is described. The emphasis is made on the influence of rotational speed on the microstructure and mechanical properties such as hardness, tensile strength, notch tensile strength and impact toughness of the dissimilar joints. Hardness profiles across the weld show the interface is harder than the respective parent metals. In general, maximum peak hardness is observed on the stainless steel side, while other peak hardness is on the low alloy steel side. A trough in hardness distribution in between the peaks is located on the low alloy steel side. Peak hardness on the stainless steel and low alloy steel side close to the interface increases with a decrease in rotational speed. All transverse tensile joints fractured on stainless steel side near the interface. Notch tensile strength and impact toughness increase with increase in rotational speed up to 1 500 r/min and decrease thereafter. The mechanism of influence of rotational speed for the observed trends is discussed in the torque, displacement characteristics, heat generation, microstructure, fractography and mechanical properties.

关键词： friction welding dissimilar metal joint austenitic stainless steel low alloy steel microstructure impact toughness tensile strength

Reputation-based secure routing protocol in mobile ad-hoc network using Jaya Cuckoo optimization

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第3期10卷 85-108页

作者： Ch.Ram Mohan venugopal reddy Ananthula CVR College of Engineering TelanganaIndia Jawaharlal Nehru Technological University Hyderabad 500085 TelanganaIndia

The advancements in Mobile Ad-hoc Network(MANET)are suitable to wide applications,which involve military applications,civilian domains,and disaster recovery *** is assumed that the nodes present in the routing protocols of MANETs are cooperative and *** assumption makes MANET more prone to manipulation and interception,which generates several possibilities of different suspicious attacks,such as Denial of Service(DoS)***,security is considered as an important parameter as the network is fond of suspicious *** paper addresses the security issues by proposing an optimization algorithm,named Jaya Cuckoo Search(JCS)algorithm,which is the combination of Jaya algorithm and Cuckoo Search(CS)algorithm for initiating secure route among the MANET nodes so that the path attained is feasible and *** proposed JCS algorithm uses a fitness function,which considers a multiobjective function using parameters,such as distance,link lifetime,delay,energy,trust,along with the reputation factor to select a secured *** JCS algorithm shows maximum performance with energy,throughput,and PDR values as 27.826 J,0.554,and 0.628,respectively.

关键词： Secure routing Cuckoo Search(CS) Jaya algorithm trust reputation

Catalytic decomposition of CH_4 over Ni-Al_2O_3-SiO_2 catalysts:Influence of pretreatment conditions for the production of H_2

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Journal of Natural Gas Chemistry 2008年第2期17卷 113-119页

作者： Jangam Ashok Gangadhara Raju Padigapati Shiva reddy Machiraju Subrahmanyam Akula venugopal Catalysis and Physical Chemistry Division Indian Institute of Chemical TechnologyTarnakaHyderabadIndia-500 607

This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, and effect of reductive pretreatment on the decomposition of methane activity is investigated. The physico-chemical characteristics of fresh and deactivated samples were characterized using BET-SA, XRD, TPR, SEM/TEM, CHNS analyses and correlated with the methane decomposition results obtained. The Ni-Al-Si （4 ： 0.5 ： 1.5） catalyst reduced with hydrazine hydrate produced better H2 yields of ca. 1815 mol H2/mol Ni than the catalyst reduced with 5% H2/N2.

关键词： in situ reduction Ni-Al2O3-SiO2 catalyst methane decomposition hydrogen production carbon nanofibers

Solvent-free aerobic oxidation of ethylbenzene over supported Ni catalysts using molecular oxygen at atmospheric pressure

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Journal of Natural Gas Chemistry 2008年第3期17卷 293-297页

作者： G.Raju P.Shiva reddy J.Ashok B.Mahipal reddy A.venugopal Catalysis & Physical Chemistry Division Indian Institute of Chemical Technology

We investigated the aerobic oxidation of ethylbenzene in the absence of solvent or any additive carried out over Ni on different types of supports namely SiO2, hydroxyapatite, SBA-15, and USY Zeolites. The oxidation of ethylbenzene activities was measured in a round bottom flask immersed in oil bath at known reaction temperature. The physicochemical characteristics of the catalysts were examined by BET surface area, XRD, FT-IR and the oxidation activities were correlated with the acidities of the catalysts obtained by TPD of NH3. It was observed that both hydroxyapatite and USY （13% Na2O） supported Ni catalysts displayed higher ethylbenzene conversion and 80% selectivity towards acetophenone.

关键词： nickel SBA-15 zeolites hydroxyapatite ethylbenzene oxidation TPD of NH3

Simultaneous determination of asenapine and valproic acid in human plasma using LC-MS/MS:Application of the method to support pharmacokinetic study

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Journal of Pharmaceutical Analysis 2013年第6期3卷 394-401页

作者： Ambavaram Vijaya Bhaskar reddy Nandigam venugopal Gajulapalle Madhavi Department of Chemistry Sri Venkateswara University

Combination of asenapine with valproic acid received regulatory approval for acute treatment of schizophrenia and maniac episodes of bipolar disorders. A simple LC-MS/MS method was developed and validated for simultaneous quantification of asenapine and valproic acid in human plasma. Internal standards were added to 300 ~L of plasma sample prior to liquid-liquid extraction using methyl tertiary butyl ether （MTBE）. Chromatographic separation was achieved on Phenomenex C18 column （50 mm ~ 4.6 mm, 5 pm） in isocratic mode at 40 ~C. The mobile phase used was 10 mM ammonium formate-acetonitrile （5：95, v/v） at a constant flow rate of 0.8 mL/min monitored on triple quadrupole mass spectrometer, operating in the multiple reaction monitoring （MRM） mode. The injection volume used for LC-MS/MS analysis was 15 taL and the run time was 2.5 min. These low run time and small injection volume suggest the high efficiency of the proposed method. The method was validated over the concentration range of 0.1-10.02ng/mL and 10-20,000ng/mL for asenapine and valproic acid respectively. The method recoveries of asenapine （81.33%）, valproic acid （81.70%）, gliclazide （78.45%） and benzoic acid （79.73） from spiked plasma samples were consistent and reproducible. The application of this method was demonstrated by a pharmacokinetic study in 8 healthy male volunteers with 5 mg asenapine and 250 mg valproic acid administration.

关键词： Asenapine Gliclazide PharmacokineticsBipolar disordersSchizophrenia Valproic acid

Dynamic Fracture Toughness of Armour Grade Quenched and Tempered Steel Joints Fabricated Using Low Hydrogen Ferritic Fillers

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Journal of Iron and Steel Research International 2010年第5期17卷 51-56页

作者： G Magudeeswaran V Balasubramanian S Sathyanarayanan G Madhusudhan reddy A Moitra S venugopal G Sasikala Department of Mechanical Engineering Pannaikkadu Veerammal Paramasivam College of Engineering andTechnology for Women Department of Manufacturing Engineering Annamalai University Materials Mechanics Section Indira Gandhi Center for Atomic Research Metal JoiningSection Defence Metallurgical Research Laboratory

The armour grade quenched and tempered steel joints fabricated using low hydrogen ferritic steel （LHF） filler exhibited superior joint efficiency owing to preferential ferrite microstructure in the welds and also they offered required resistance to HIC. However, the combat vehicles used in military operations will be required to operate under a wide range of road conditions ranging from first class to cross country. Structural components in combat vehicles are subjected to dynamic loading with high strain rates during operation. Stress loadings within the vehicle hull of these vehicles are expected to fluctuate considerably and structural cracking especially in welds during the service life of these vehicles can lead to catastrophic failures. Under these conditions, fracture behaviour of high strain rate sensitive structural steels can be better understood by dynamic fracture toughness （k1d）. Hence, an attempt was made to study dynamic fracture toughness of the armour grade quenched and tempered steel and their welds fabricated using LHF consumables. The experimental results indicate that the k1d values of the joints fabricated by shielded metal arc welding （SMAW） are higher than those of the joints fabricated using flux cored arc welding （FCAW） process.

关键词： quenched steel tempered steel low hydrogen ferritic steel dynamic fracture toughness

RUDIE:Robust approach for underwater digital image enhancement

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Journal of Electronic Science and Technology 2024年第4期22卷 96-108页

作者： V.Sidda reddy G.Ravi Shankar reddy k.Sivanagi reddy Department of Information Technology Stanley College of Engineering and Technology for WomenHyderabad500001India Department of Electronics and Communication Engineering CVR College of EngineeringHyderabad501510India Department of Electronics and Communication Engineering Sridevi Women’s Engineering CollegeHyderabad500075India

Processing underwater digital images is critical in ocean engineering,biology,and environmental studies,focusing on challenges such as poor lighting,image de-scattering,and color *** to environmental conditions on the sea floor,improving image contrast and clarity is essential for underwater navigation and obstacle *** in turbid,low-visibility waters,we require robust computer vision techniques and *** the past decade,various models for underwater image enrichment have been proposed to address quality and visibility issues under dynamic and natural lighting *** research article aims to evaluate various image improvement methods and propose a robust model that improves image quality,addresses turbidity,and enhances color,ultimately improving obstacle avoidance in autonomous *** proposed model demonstrates high accuracy compared to traditional *** result analysis indicates the proposed model produces images with greatly improved visibility and exceptional color ***,research can unlock new possibilities for underwater exploration,monitoring,and intervention by advancing the state-of-the-art models in this domain.

关键词： Computer vision Digital image Fuzzy logic Histogram Image processing