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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

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 （M.corchorifolia）aerial part extracts.Methods:Antioxidant activitywas evaluated by using three free radicals（Superoxide,Hydroxyl and DPPH） and hepatoprotective activity was assessed against CCl4 induced liver intoxication in ruts.Results:The extracts produced concentration dependent percentage protection in decrease of serum enzymes and percentage inhibition on free radicals.Among 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 179μg.Conclusions:From the results obtained during the study it could be concluded that M.corchorifolia aerial part extracts have antioxidant and hepaloprotective components.Further 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 CCl4 Hepatoprotective activity

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）.

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)

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

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 technique.Structural,optical and mechanical properties were investigated with increase in CaF_(2) content.Using X-ray diffraction(XRD),synthesized glasses were confirmed to be amorphous in nature.Replacement of oxygen ions by fluorine ions increased the values of density.Decrease in refractive index due to the low polarizability of fluorine ions in the glass matrix was observed.In 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 structure.These data were well supported by Raman spectra.Optical 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 ions.Mechanical parameters such as Vickers hardness,fracture toughness and brittleness were evaluated from the Vickers micro indentation measurements.Increase 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

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(S.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 d.Nephrotoxicity 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 rats.Results:It was observed that the GM treatment induced significant elevation(P<0.001) in plasma and urine urea,creatinine,kidney weight,blood urea nitrogen, renal lipid peroxidation along with significant decrement(P<0.001) in urine output,renal enzymatic and non-enzymatic antioxidants.SXE 200 and 400 mg/kg treatment to GM treated rats recorded significant decrement(up to P<0.001) in plasma and mine urea and creatinine, renal lipid peroxidation along with significanl increment(up to P<0.001) in renal enzymatic and non-enzvmatic antioxidants.Histological obsenatioiis of kidney tissues too correlated with the biochemical obsenatioiis.Conclusions: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

Isolated cerebral aspergillus abscess as a complication of pulmonary alveolar proteinosis in a child

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Chinese Neurosurgical Journal 2019年第3期5卷 182-185页

作者： Rachna Khera venkateswara rao Mohan Krishna Pasam Ravindranath Tagore Sudha SMurthy Challa Sundaram Department of Laboratory Medicine Basavatarakam Indo-American Cancer Hospital and Research InstituteHyderabadTelangana500034India Department of Neurosurgery Basavatarakam Indoamerican Cancer Hospital and Research InstituteHyderabadTelangana500034India

Pulmonary alveolar proteinosis (PAP) poses a risk of opportunistic infections with a variety of organisms with Nocardia being the most common pathogen followed by mycobacteria and fungi. Case presentation: A 7-year-old female child, presented with headache and multiple episodes of vomiting. There was no fever or altered sensorium. On examination, there were no focal deficits or cranial nerve palsies. An MRI brain showed a small T2 hyperintense lesion in the left superior parietal lobe suggestive of an abscess. She was diagnosed as PAP based on CT chest and bronchioloalveolar lavage 7 months earlier and treated with corticosteroids. A left parieto-occipital craniotomy was done with drainage of abscess and abscess wall excision. Histopathology revealed a suppurative lesion with slender septate acute angle branching hyphae which were positive on fungal stains. Culture done on the pus was positive for Aspergil us fumigatus. The patient was treated with voriconazole and stable at 1 year follow-up. Conclusion: Opportunistic infections are common in patients diagnosed with PAP. High index of clinical suspicion and early diagnosis are important for favorable outcome.

关键词： Pulmonary alveolar proteinosis Opportunistic infection Aspergillus fumigatus Cerebral abscess

Effect of carbon-doping on structural and dielectric properties of zinc oxide

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Journal of Advanced Dielectrics 2020年第4期10卷 61-67页

作者： MD.Parvez Ahmad A.venkateswara rao K.Suresh Babu G.Narsinga rao Advanced Functional Materials Research Centre Department of Physics Koneru Lakshmaiah Education Foundation VaddeswaramGunturAndhra Pradesh 522502India Department of Humanities&Sciences Marri Laxman Reddy Institute of Technology and Management Hyderabad Telangana 500043India

In this paper,Carbon-doped Zinc Oxide(C-ZnO)samples were prepared using the solid-state reaction method.The influence of carbon-doping on the structural and dielectric properties of ZnO samples was studied.The shift in the highest peak position(101)in XRD patterns of carbon-doped samples was observed.The Raman peak at 581 cm^(-1) in undoped ZnO was shifted and broadened in carbon-doped ZnO samples.The ZnO samples doped with carbon show higher values of dielectric constant(~2400 at 1 kHz)compared to pure ZnO(~9 at 1 kHz)which was due to increase in native point defects in the samples.The ac conductivity(σ_(ac))value of the carbon-doped sample was enhanced by 103 times for((ZnO)_(0.9) C_(0.1))sample.

关键词： Zinc oxide dielectric properties high dielectric permittivity AC conductivity