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Impact of Cyclone Nilam on Tropical Lower Atmospheric Dynamics

Advances in Atmospheric Sciences 2016年第8期33卷 955-968页

作者： P.VINAY KUMAR Gopa DUTTA M.V.RATNAM E.KRISHNA b.bAPIRAJU b.venkateswara rao Salauddin MOHAMMAD Vignana bharathi Institute of Technology HyderabadTS 501301India National Atmospheric Research Laboratory GadankiAP 517112India Jawaharlal Nehru Technological University HyderabadTS 500085India

A deep depression formed over the bay of bengal on 28 October 2012, and developed into a cyclonic storm. After landfall near the south coast of Chennai, cyclone Nilam moved north-northwestwards. Coordinated experiments were conducted from the Indian stations of Gadanki（13.5？N, 79.2？E） and Hyderabad（17.4？N, 78.5？E） to study the modification of gravity-wave activity and turbulence by cyclone Nilam, using GPS radiosonde and mesosphere–stratosphere–troposphere radar data. The horizontal velocities underwent large changes during the closest approach of the storm to the experimental sites. Hodograph analysis revealed that inertia gravity waves（IGWs） associated with the cyclone changed their directions from northeast（control time） to northwest following the path of the cyclone. The momentum flux of IGWs and short-period gravity waves（1–8 h） enhanced prior to, and during, the passage of the storm（±0.05 m2s-2and ±0.3 m2s-2, respectively）, compared to the flux after its passage. The corresponding body forces underwent similar changes, with values ranging between ±2–4m s-1d-1and ±12–15 m s-1d-1. The turbulence refractivity structure constant（C2n） showed large values below 10 km before the passage of the cyclone when humidity in the region was very high. Turbulence and humidity reduced during the passage of the storm when a turbulent layer at ～17 km became more intense. Turbulence in the lower troposphere and near the tropopause became weak after the passage of the cyclone.

关键词： inertia gravity waves turbulence momentum flux convective process tropical cyclone

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Hepatoprotective and antioxidant capacity of Melochia corchorifolia extracts

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Asian Pacific Journal of Tropical Medicine 2013年第7期6卷 537-543页

作者： b Ganga rao Y venkateswara rao T Mallikarjuna rao A.U College of Pharmaceutical Sciences Andhra UniversityVisakhapatnamAndhra PradeshIndia-530003 Department of botany College of Science and TechnologyAndhra University.VisakhapatnamAndhra PradeshIndia-530003

Objective:To evaluate bepato protective and antioxidant capacity of Melochia corchorifolia （***）aerial part ***:Antioxidant activitywas evaluated by using three free radicals（Superoxide,Hydroxyl and DPPH） and hepatoprotective activity was assessed against CCl4 induced liver intoxication in ***:The extracts produced concentration dependent percentage protection in decrease of serum enzymes and percentage inhibition on free *** all extracts methanol extract showed better activity with percentage protection of SGOT（78.98%）,SGPT（79.65%）,ALP（82.48%） and total bilirubin（80.0%）levels against CCl4 liver intoxication and also methanolic extract showed better activity with IC50 values on superoxide. hydroxyl and DPPH radicals were 127μg.240μg and 179μ***:From the results obtained during the study it could be concluded that *** aerial part extracts have antioxidant and hepaloprotective *** study is necessary for isolation and characterization of bioactive molecules which are responsible for hepatoprotective and antioxidant activity.

关键词： Melochia corchorifolia Aerial parts Free radicals Antioxidant Activity CCl_4 Hepatoprotective activity

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Development of STEP AP224 Extractor for Interfacing Feature based CAPP to STEP-NC(AP238)

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International Journal of Automation and computing 2019年第5期16卷 655-670页

作者： Deepanshu Srivastava venkateswara rao Komma Department of Mechanical Engineering Motilal Nehru National Institute of Technology

Manufacturing features represent area of interest on the machinable surface of a part, which can provide a unique set of removable volumes from part. Feature description in standard for exchange of product(STEP) AP224 is an efficient neutral format for the development of feature based process planning. Process planning information of features can be converted to numerical control(NC)code to have complete manufacturing information of part. STEP-NC code provides an efficient manufacturing information model compared to G-M codes. In this work, an interface is developed for extraction of feature information available in AP224(AIM) format and the ruled-based approach is used to select different process planning parameters. A graphical user interface(GUI) is developed for the interface for displaying features information as represented in AP224 file. Furthermore, the interface generates STEP-NC code in AP238 format. The developed interface has three modules. 1) Module I: Reading interface for STEP AP224 file and development of GUI. 2)Module II: Selection of feature based process planning parameters. 3) Module III: Writing interface for STEP-NC(AP238). The developed interface has been implemented in Java through Java standard data access interface(JSDAITM). The generated STEP-NC AP238 code for the test part has been successfully simulated on STEP-NC Machine TM, an AP238 simulator. This article also provides an in-depth view of application interpreted model(AIM) representation format of STEP for AP224 and AP238.

关键词： Standard for exchange of product (STEP) AP224 AP238 Java standard data access interface (JSDAITM) computer aided design(CAD)/computer aided process planning(CAPP)/computer aided manufacturing(CAM)

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STEP-based Feature Recognition System for b-spline Surface Features

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International Journal of Automation and computing 2018年第4期15卷 500-512页

作者： bitla Venu venkateswara rao Komma Deepanshu Srivastava Department of Mechanical Engineering Motilal Nehru National Institute of Technology

The geometrical and topological information of 3D computer aided design （CAD） models should be represented as a neut- ral format file to exchange the data between different CAD systems. Exchange of 3D CAD model data implies that the companies must exchange complete information about their products, all the way from design, manufacturing to inspection and shipping. This informa- tion should be available to each relevant partner over the entire life cycle of the product. This led to the development of an international standard organization （ISO） neutral format file named as standard for the exchange of product model data （STEP）. It has been ob- served from the literature, the feature recognition systems developed were identified as planar, cylindrical, conical and to some extent spherical and toroidal surfaces. The advanced surface features such as b-spline and its subtypes are not identified. Therefore, in this work, a STEP-based feature recognition system is developed to recognize t--spline surface features and its sub-types from the 3D CAD model represented in AP203 neutral file format. The developed feature recognition system is implemented in Java programming language and the product model data represented in STEP AP203 format is interpreted through Java standard data access interface （JSDAI）. The developed system could recognize b-spline surface features such as b-Spline surface with knots, quasi uniform surface, uniform surface, rational surface and bezier surface. The application of extracted b-spline surface features information is discussed with reference to the toolpath generation for STEP-NC （STEP AP238）.

关键词： Feature recognition 3D computer aided design(CAD)model geometrical information standard for the exchange ofproduct model data(STEP)AP203 Java standard data access interface(JSDAI).

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The Role of Vanadia for the Selective Oxidation of benzyl Alcohol over Heteropolymolybdate Supported on Alumina

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催化学报 2011年第11期32卷 1719-1726页

作者： Pasupulet Siva Nageswara rao Kasanneni Tirumala venkateswara rao Potharaju S. SAI PRASAD Nakka LINGAIAH Catalysis Laboratory Inorganic and Physical Chemistty Division Indian Institute of Chemical Technology Hyderabad 500 607 lndia

A series of 12-molybdophosphoric acid (MPA) supported on V2O5 dispersed γ-Al2O3 catalysts with different vanadia loadings were prepared by impregnation and characterized by N2 adsorption-desorption, X-ray diffraction, temperature-programmed reduction, in situ laser Raman spectroscopy, UV-Vis diffused reflectance spectroscopy, scanning electron microscopy, and temperature-programmed desorption of NH3 techniques. Their catalytic activities were evaluated for the vapor phase aerobic oxidation of benzyl alcohol. The catalysts exhibited high catalytic activity and the conversion of benzyl alcohol depended on the vanadia content while the catalyst with 15 wt% V2O5 content showed optimum activity. The characterization results suggest the presence of well-dispersed V2O5 and partially disintegrated Keggin ions of MPA on the support. In situ Raman studies showed a reduced Mo(IV) species when the catalysts were calcined at high temperatures. The high oxidation activity of the catalysts is related to the synergistic effect between MPA and V2O5.

关键词： molybdophosphoric acid vanadia alumina oxidation benzyl alcohol

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High accuracy offering attention mechanisms based deep learning approach using CNN/bi-LSTM for sentiment analysis

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International Journal of Intelligent Computing and Cybernetics 2022年第1期15卷 61-74页

作者： venkateswara rao Kota Shyamala Devi Munisamy CSE Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and TechnologyChennaiIndia CSE Andhra Loyola Institute of Engineering and TechnologyVijayawadaIndia

Purpose-Neural network(NN)-based deep learning(DL)approach is considered for sentiment analysis(SA)by incorporating convolutional neural network(CNN),bi-directional long short-term memory(bi-LSTM)and attention *** the conventional supervised machine learning natural language processing algorithms,the authors have used unsupervised deep learning ***/methodology/approach-The method presented for sentiment analysis is designed using CNN,bi-LSTM and the attention ***2vec word embedding is used for natural language processing(NLP).The discussed approach is designed for sentence-level SA which consists of one embedding layer,two convolutional layers with max-pooling,oneLSTMlayer and two fully connected(FC)*** the system training time is 30 ***-The method performance is analyzed using metrics like precision,recall,F1 score,and *** is helped to reduce the complexity and bi-LSTM is helped to process the long sequence input ***/value-The attention mechanism is adopted to decide the significance of every hidden state and give a weighted sum of all the features fed as input.

关键词： Sentiment analysis NLP Neural networks bi-LSTM Attention mechanism Word embedding Dropout Fully connected(FC)layer Performance metrics

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Structural,optical and mechanical properties of ternary CaO-CaF_(2)-P_(2)O_(5) glasses

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Journal of Advanced Ceramics 2014年第2期3卷 109-116页

作者： G.venkateswara rao H.D.SHASHIKALA Department of Physics National Institute of Technology KarnatakaSurathkalPost SrinivasanagarMangalore-575025KarnatakaIndia

The ternary phosphate glass series(50-x)CaO-xCaF_(2)-50P_(2)O_(5)(x=0-20 mol%)were synthesized using melt quench ***,optical and mechanical properties were investigated with increase in CaF_(2) *** X-ray diffraction(XRD),synthesized glasses were confirmed to be amorphous in *** of oxygen ions by fluorine ions increased the values of *** in refractive index due to the low polarizability of fluorine ions in the glass matrix was *** Fourier transform infrared(FTIR)spectra,the slight variation in v_(as)(PO_(2))band position and intensity could be attributed to replacement of fluorine ions for oxygen ions in phosphate glass *** data were well supported by Raman *** band gap energy increased from 3.44 eV to 3.64 eV with increase in CaF_(2) content,and Urbach energy decreased suggesting that the fluorine ions reduced the tail energy states in the band gap compared to the oxygen *** parameters such as Vickers hardness,fracture toughness and brittleness were evaluated from the Vickers micro indentation *** in Vickers hardness,decrease in fracture toughness and increase in brittleness were observed with increase in CaF_(2) content.

关键词： phosphate glass Fourier transform infrared(FTIR)spectra Raman spectra mechanical properties

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Estimating aquifer transmissivity using Dar-Zarrouk parameters to delineate groundwater potential zones in Alluri Seetharama Raju District,Andhra Pradesh, India

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Journal of Groundwater Science and Engineering 2023年第2期11卷 116-132页

作者： bakuru Anandagajapathi Raju Palavai venkateswara rao Mangalampalli Subrahmanyam Department of Geophysics Colleges of Science&TechnologyAndhra UniversityVisakhapatnam 530003Andhra PradeshIndia

This study aimed to explore groundwater potential zones in the EGMb of Alluri Seetharama Raju district, Andhra Pradesh, India, for drinking and agriculture purposes. To achieve this goal, 72 Vertical Electrical Soundings(VES) were conducted using the Schlumberger electrode configuration. The resistivity sounding data were analyzed to determine the aquifer thickness, basement depth, Dar-Zarrouk parameters,and aquifer transmissivity. Spatial distribution maps were generated for these parameters to understand the subsurface formation. The analysis revealed a linear groundwater potential zone(8.46 km~2) in the eastern part of the study area, extending in the NNE-SSW direction for 9.6 km. Six VES locations(P24, P27, P29,P30, P33, and P38) in this zone exhibit good potential(>30 m aquifer thickness), while the three VES locations(OP19, P5, and P46) in the central region are recommended for drilling bore wells. Additionally,moderate aquifer thickness(20–30 m) are identified in other VES locations(OP14, OP20, P4, P10, P12,P13, P15, P17, P18, P31, P46, and P50) along streams in the western and central part of the area, which can yield reasonable quantities of water. This information is useful for groundwater exploration and watershed management to meet the demands of tribal population in the study area.

关键词： Vertical electrical sounding Longitudinal conductance Transverse resistance Coefficient of anisotropy Potential groundwater locations

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Representation of classifier distributions in terms of hypergeometric functions

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China Particuology 2007年第4期5卷 274-283页

作者： b.Venkoba rao Engineering and Industrial Services Tata Consultancy Services Ltd.1 Mangaldas RoadPune 411001India

This paper derives alternative analytical expressions for classifier product distributions in terms of Gauss hypergeometric function, 2F1, by considering feed distribution defined in terms of Gates-Gaudin-Schumann function and efficiency curve defined in terms of a logistic function. It is shown that classifier distributions under dispersed conditions of classification pivot at a common size and the distributions are difference similar. The paper also addresses an inverse problem of classifier distributions wherein the feed distribution and efficiency curve are identified from the measured product distributions without needing to know the solid flow split of particles to any of the product streams.

关键词： Classifier Efficiency curve Inverse problem

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Nephroprotective activity of Solanum xanthocarpum fruit extract against gentamicin-induced nephrotoxicity and renal dysfunction in experimental rodents

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Asian Pacific Journal of Tropical Medicine 2012年第9期5卷 686-691页

作者： Talib Hussain Ramesh K Gupta K Sweety bavani Eswaran M Vijayakumar Chandana venkateswara rao Pharmacognosy and Ethnopharmacology Division National Botanical Research InstituteLucknowUttar Pradesh226001India Department of Pharmacology and Toxicology Faculty of PharmacyIntegral UniversityLucknowUttar Pradesh226001India

Objective:To evaluate nephroprotective potential of Solarium xanthocarpum(***) fruit extract(SXE) against gentamicin(GM) induced nephrotoxicity) and renal dysfunction. Methods:Twenty-four Wistar rats were divided into four groups(n=6).Control rats that received normal saline(i.p.) and 0.5%carboxymethyl cellulose(p.o.) per day lor 8 *** was induced in rats by intraperitoneal administration of GM(100 mg/kg/d for 8 d) and were treated with SXE(200 and 400 mg/kg/d(p.o.) for 8 d).Plasma and urine urea and creatinine,kidney weight,urine output,blood urea nitrogen,renal enzymatic and non-enzymatic antioxidants and lipid peroxidation was evaluated along with histopathological investigation in various experimental groupsof ***:It was observed that the GM treatment induced significant elevation(Pblood urea nitrogen, renal lipid peroxidation along with significant decrement(Pbsenatioiis of kidney tissues too correlated with the biochemical ***:These finding powerfully supports that S,xanthocarpum fruit extract acts in the kidney as a potent scavenger of free radicals to prevent the toxic effects of GM both in the biochemical and histopathological parameters and thus validates its elhnomedicinal use.

关键词： Solanum xanthocarpum Gentamicin Antioxidants Nephrotoxicity Renal dysfunction

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