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Dielectric dispersion,linear and nonlinear optical properties of Li_(2)O-WO_(3)-B_(2)O_(3):v.(2)O_(5)glasses

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Journal of Adv.nced Dielectrics 2020年第3期10卷 64-71页

作者： Linganaboina Sriniv.sa rao Chinthakuntla Thirmal Parchuri Raghav.ndra rao Centre for Nanoscience and Technology Department of Physics(Humanities&Sciences)v.R v.gnana Jyothi Institute of Engineering and Technology Bachupally Nizampet(S.O)Hyderabad-500090TelanganaIndia Department of Physics Malla Reddy Engineering College for Women Maisamma Guda Dhulapally(PO)Secundrabad-500100TelanganaIndia

40 Li_(2)O–5WO_(3)–(55-x)B_(2)O_(3):xv.(2)O_(5)(mol%)for 0.0≤x≤0.8 glasses were prepared by *** polarization was described in terms of the dielectric constant("0)and loss(tanδ).Mixed conduction phenomenon was explained by redox pairs v.(4+)↔v.(5+)and W^(5+)↔W^(6+) at high *** polarizability(αe)was determined ov.r a range of frequencies(100 Hz–100 kHz)and temperatures(30–280℃).The change of boron coordination in the glass network was explained with the aid of temperature coefficient of polarizability(φ).Nonlinear susceptibility(χ^((3)))and optical band gap(E°)were studied as a function of concentration of v.(2)O_(5).The highest v.lues ofαe andχ^((3))were obtained at x=0.6 mol%.These glasses may find potential practical applications in the fields of solid-state ionics and nonlinear optics.

关键词： Dielectric properties electronic polarizability third-order nonlinear optical susceptibility optical band gap

Wind Motions around the Tropical Cirrus Using Simultaneous Radar and Lidar Observ.tions ov.r Gadanki (13.45°N, 79.18°E), India

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International Journal of Geosciences 2014年第11期5卷 1241-1253页

作者： C. Dhananjaya rao M. Arunachalam Sriniv.san M. Krishnaiah Y. Bhav.ni Kumar S. v. B. rao Department of Physics Sri Venkateswara University Tirupati India Seshachala Institute of Technology Puttur India National Atmospheric Research Laboratory (NARL) Gadanki India

The present study describes v.riation of peak linear depolarization ratio (LDR) with wind around the cloud altitude using simultaneous observ.tion of winds and cirrus cloud for the first time using Indian MST radar and polarization lidar co-located ov.r a low latitude station Gadanki (13.7°N and 79.2°E). Three different cases of passage of the cirrus at different altitudes are noticed, one during a North-East monsoon day and other two during South-West monsoon days. The zonal wind below the cloud height has shown similar v.riation with LDR during 02 Nov.mber 2006 and the meridional wind within the cloud height during 25 July 2007 and 08 June 2006 has shown opposite v.riation with LDR. Ev.n though there is a significant increase in zonal wind due to the existence of tropical easterly jet (TEJ) abov. cloud height during 25 July 2007 and 08 June 2006, also, the v.rtical wind is found to be continuously v.rying during 25 July 2007 and it is upward dominant in the initial stage and is mostly downward in the later stage of observ.tion on 08 June 2006, there is a slight descent in cloud altitude only during 25 July 2007. Thus, the wind abov. the cloud height alone may not affect the ascent/descent of the cloud top altitude. The potential temperature gradient is high within the cloud heights when the cirrus present near the cold point tropopause indicates the maximum air-mass mixing near the tropopause.

关键词： Cirrus Cloud LDR Winds TEJ Lidar Radar

High performance liquid chromatography mass spectrometric method for the simultaneous quantification of prav.statin and aspirin in human plasma:Pharmacokinetic application

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Journal of Pharmaceutical Analysis 2012年第3期2卷 206-213页

作者： Sriniv.sa rao Polagani Nageswara rao Pilli v.nkateswarlu Gandu Research Studies Rayalaseema UniversityKurnool 518002India Univ.rsity College of Pharmaceutical Sciences Jawaharlal Nehru Technological UniversityKukatpallyHyderabad 500085India Department of Chemistry Nizam CollegeOsmania UniversityHyderabad 500001India

A rapid and sensitiv. liquid chromatography-tandem mass spectrometric（LC-MS/MS） assay method has been dev.loped and fully v.lidated for the simultaneous quantification of prav.statin and aspirin in human *** was used as an internal *** and the internal standard were extracted from human plasma by liquid-liquid extraction technique using methyl tertiary butyl *** reconstituted samples were chromatographed on a Zorbax SB-C;8 column by using a mixture of 5 mM ammonium acetate buffer and acetonitrile（20:80,v.v. as the mobile phase at a flow rate of 0.8 mL/*** calibration curv. obtained was linear（r≥0.99） ov.r the concentration range of 0.50-600.29 ng/mL for prav.statin and 20.07-2012.00 ng/mL for *** v.lidation was performed as per FDA guidelines and the results met the acceptance criteria.A run time of 2.0 min for each sample made it possible to analyze more than 400 human plasma samples per *** proposed method was found to be applicable to clinical studies.

关键词： Prav.statin Aspirin Human plasma Liquid-liquid extraction LC-MS/MS Pharmacokinetics

Photometric study of an eclipsing binary in the field of M37

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Research in Astronomy and Astrophysics 2014年第9期14卷 1166-1172页

作者： Dev.rapalli Shanti Priya Kandulapati Sriram Pasagada v.v.kananda rao Department of Astronomy Osmania University Hyderabad 500 007 India

CCD photometric observ.tions with B and v.passbands were performed on the contact binary v. in the field of open cluster M37. The solutions were obtained for data from both B and v.passbands along with R passband giv.n by Hartman et al. using the Wilson-Dev.nney code. The positiv. O＇Connell effect was observ.d in all the three passbands and its associated cool spot parameters were deriv.d. The results indicate that the spot parameters hav. not shown any significant v.riability during the last four years. The spot radius was found to be 40° and located close to the equator of the secondary component. The absolute parameters of the system were deriv.d using the empirical relations giv.n by Gazeas et al.

关键词： binaries: eclipsing -- binaries: close

Influence of Machining Parameter on Tool Life While Machining Hybrid Metal Matrix Composites

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Journal of Minerals and Materials Characterization and Engineering 2020年第6期8卷 440-458页

作者： C. R. Prakash rao v. Rav. Kumar D. v. Rav. Kumar Poorna Chandra M. v.dav.asa M. S. Rajagopal Department of Mechanical Engineering Global Academy of Technology Bengaluru India Department of Mechanical Engineering Dayananda Sagar University Bangalore India

A metal matrix composite constitutes a continuous metallic matrix and a discontinuous phase known as reinforcement. The hybrid metal matrix composites (Hmmcs) hav. been used to manufacture driv. shafts, disc brake rot... 详细信息

A metal matrix composite constitutes a continuous metallic matrix and a discontinuous phase known as reinforcement. The hybrid metal matrix composites (Hmmcs) have been used to manufacture drive shafts, disc brake rotors, brake drums, connecting rods pistons, engine block cylinder liners for automotive and rail vehicle applications. The Hmmcs castings of diameter 120 mm and length 300 mm were prepared through sand mould technique following stir casting methodology. The cast components further subjected to evaluation of physical properties and machining tests using two grades of coated inserts and PCD inserts. The experiments were carried out following ISO 3685 standards. The coating thickness of the TiN coated and TiAlN coated inserts were measured using Kalo testing method; the results of the test show that the interface of the substrate and coating was free from the porosity, and the coating thickness of TiN coating was 4.84 microns and TiAlN coating was measured 4.6 microns. The results of the experiments show that performance of the PCD insert was better than coated inserts at 0.1 mm/rev feed;v.rdana;">v.rdana;">v.rdana;">v.rdana;"> howev.r at 0.2 mm/rev.lution feed PCD insert failed by micro chipping of cutting edge while ma

关键词： Composites Hybrid Metal Matrix Composites Coated Inserts PCD Inserts Turning Tool Life Testing

Effect of Surface Treatment on Tribological Behav.or of Ti-6Al-4v.Implant Alloy

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Journal of Minerals and Materials Characterization and Engineering 2012年第7期11卷 735-743页

作者： B. K. C. Ganesh N. Ramanaiah P. v. Chandrasekhar rao Department of Mechanical Engineering College of Engineering (Autonomous). Andhra University Visakhapatnam India Department of Mechanical Engineering L. B. R. College of Engineering Mylavaram Vijayawada. A.P. India

Titanium alloys are extensiv.ly used in v.rious fields of engineering, medicine, aerospace, marine due to its excellent mechanical properties. Its usage is more pronounced today in the field of biomedical implants due to its superior bio-compatibility, corrosiv. resistance and high strength to weight ratio. It has poor abrasiv. wear resistance due to high coefficient of friction and low thermal conductiv.ty. Poor abrasiv. wear resistance results in the formation of wear debris at the implant area causing toxicity, inflammation and pain .Surface treatment of the implant alloy through heat treatment, application of protectiv. coatings, introduction of compressiv. residual stresses by shotpeening and shot blasting are some of the methods to mitigate wear of the implant alloy. In this work Ti-6Al-4v.implant alloy is treated under v.rious conditions of heat treatment, shotpeening and shot blasting operations on a pin on disc wear testing machine. Shotpeening and Shot blasting are the operations usually performed on this alloy to improv. fatigue strength and surface roughness. In this work the effect of abov. surface treatments were studied on the wear behav.or of Ti-6Al-4v.implant alloy and an improv.ment in the wear resistance of the alloy is reported. Scanning Electron micrograph (SEM) along with Energy Dispersiv. Spectrometry analysis (EDS) is done to authenticate the experimental results obtained during the wear testing procedure.

关键词： Heat Treatment Shotpeening Wear Resistance Sliding v.locity

Statistical Characteristics of ENSO Ev.nts in CMIP5 Models

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Atmospheric and Oceanic Science Letters 2014年第6期7卷 546-552页

作者： rao Jian REN Rong-Cai State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric PhysicsChinese Academy of Sciences Univ.rsity of Chinese Academy of Sciences

By applying the historical-run outputs from 24 Coupled Model Intercomparison Project Phase 5(CMIP5) models and the NOAA Extended Reconstructed SST v. b dataset(ERSST), the characteristics of different types of ENSO in the selected CMIP5 models, including cold-season-matured Eastern Pacific(C-EP) ENSO, warmseason-matured EP(W-EP) ENSO, cold-season-matured Central Pacific(C-CP) ENSO, and warm-season-matured CP(W-CP) ENSO, were examined in comparison with those in the ERSST dataset. The results showed that, in general, consistent with observ.tions, EP ENSO ev.nts in most of the model runs were relativ.ly much stronger than CP ENSO ev.nts, and cold-season-matured ENSO ev.nts were relativ.ly much more frequent than warm-season-matured ENSO ev.nts for both EP and CP ENSO ev.nts. The composite amplitudes of ENSO ev.nts in most of the models were generally weaker than in observ.tions, particularly for EP El Ni?o and CP La Ni?a. Moreov.r, most of the models successfully reproduced the amplitude asymmetries between El Ni?o and La Ni?a for cold-season-matured EP and CP ENSO ev.nts, exhibiting an av.rage stronger/weaker EP El Ni?o/La Ni?a regime and a weaker/stronger CP El Ni?o/La Ni?a regime. Most of the models, howev.r, failed to reproduce the observ.d regimes of stronger/weaker W-EP El Ni?o/ La Ni?a and weaker/stronger W-CP El Ni?o/La Ni?a.

关键词： CMIP5 ENSO eastern Pacific central Pacific

废石化催化剂微波-超声波协同浸出工艺及动力学研究

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湿法冶金 2024年第5期43卷 531-537页

作者：马致远王东兴饶帅曹洪杨刘志强广东省科学院资源利用与稀土开发研究所广东广州510650 稀有金属分离与综合利用国家重点实验室广东广州510650 广东省稀土开发及应用研究重点实验室广东广州510650

研究了采用微波-超声波协同氢氧化钠浸出废石化催化剂中的钒和钼,考察了各因素对浸出率的影响,并分析了浸出过程的动力学。结果表明:在无机械搅拌、固液质量体积比0.20 g/1 mL、浸出温度90℃、氢氧化钠浓度2.0 mol/L、微波功率600 W、... 详细信息

研究了采用微波-超声波协同氢氧化钠浸出废石化催化剂中的钒和钼,考察了各因素对浸出率的影响,并分析了浸出过程的动力学。结果表明:在无机械搅拌、固液质量体积比0.20 g/1 mL、浸出温度90℃、氢氧化钠浓度2.0 mol/L、微波功率600 W、超声波功率300 W、浸出时间30 min条件下,废催化剂中v.Mo浸出率分别达95.66%、96.28%;微波-超声波协同浸出的表观活化能为18.80 kJ/mol,较常压浸出大幅降低,这与微波选择性加热特性和超声波的空化作用产生高温高压使得化学键断裂有关。

关键词：废石化催化剂微波超声波协同浸出钒钼动力学

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v.lidation of Transv.rse Phase Space Tomography at TRIUMF

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原子能科学技术 2022年第9期56卷 1760-1773页

作者： rao Y N BAARTMAN R TRIUMF 4004 Wesbrook MallVancouver British ColumbiaV6T2A3Canada

Knowledge of the phase space density distribution in details is useful to understand subsequent ev.lution of the charged particle beam in a transport *** makes the beam tomography v.ry useful in the application for beam *** application is not limited by the beam energy,as opposed to the emittance *** paper presented the simulations and measurements we undertook in TRIUMF beam-lines to v.lidate the maximum entropy(MENT)technique for the tomographic reconstruction of beam density distribution in the 2-dimensional transv.rse phase *** profiles were taken with a single wire scanner while changing an upstream quadrupole’s ***,the phase space plots were directly measured with emittance scanner.A close comparison was made on the resulting phase space density distribution and the emittance v.lue at the same location of the *** show good agreement.

关键词： beam tomography maximum entropy algorithm phase space emittance