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Pitting corrosion resistance and bond strength of stainless steel overlay by friction surfacing on high strength low alloy steel

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Defence Technology（防务技术） 2015年第3期11卷 299-307页

作者： Amit kumar SINGH G.Madhusudhan REDDY k.srinivas rao Defence Metallurgical Research Laboratory Andhra University

Surface modification is essential for improving the service properties of components. Cladding is one of the most widely employed methods of surface modification. Friction surfacing is a candidate process for depositing the corrosion resistant coatings. Being a solid state process, it offers several advantages over conventional fusion based surfacing process. The aim of this work is to identify the relationship between the input variables and the process response and develop the predictive models that can be used in the design of new friction surfacing applications. In the current work, austenitic stainless steel AISI 304 was friction surfaced on high strength low alloy steel substrate. Friction surfacing parameters,such as mechtrode rotational speed, feed rate of substrate and axial force on mechtrode, play a major role in determining the pitting corrosion resistance and bond strength of friction surfaced coatings. Friction surfaced coating and base metal were tested for pitting corrosion by potentiodynamic polarization technique. Coating microstructure was characterized using optical microscopy, scanning electron microscopy and X-ray diffraction. Coatings in the as deposited condition exhibited strain-induced martensite in austenitic matrix. Pitting resistance of surfaced coatings was found to be much lower than that of mechtrode material and superior to that of substrate. A central composite design with three factors(mechtrode rotational speed, substrate traverse speed, axial load on mechtrode) and five levels was chosen to minimize the number of experimental conditions. Response surface methodology was used to develop the model. In the present work, an attempt has been made to develop a mathematical model to predict the pitting corrosion resistance and bond strength by incorporating the friction surfacing process parameters.

关键词：奥氏体不锈钢摩擦堆焊粘结强度低合金高强度抗蚀性钢表面耐点蚀性能

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Adaptive Signal Enhancement Unit for EEG Analysis in Remote Patient Care Monitoring Systems

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Computers, Materials & Continua 2021年第5期67卷 1801-1817页

作者： Ch.srinivas k.Chandrabhushana rao Department of Electronics and Communication Engineering J.N.T.UniversityKakinada533003India Department of Electronics and Communication Engineering JNTUK-UCEVVizianagaram535003India

In this paper we propose an efcient process of physiological artifact elimination methodology from brain waves(BW),which are also commonly known as electroencephalogram(EEG)*** a clinical environment during the acquisition of BW several artifacts contaminates the actual BW *** leads to inaccurate and ambiguous *** the statistical nature of the EEG signal is more non-stationery,adaptive ltering is the more promising method for the process of artifact *** clinical conditions,the conventional adaptive techniques require many numbers of computational operations and leads to data samples overlapping and instability of the algorithm *** causes delay in diagnosis and decision *** overcome this problem in our work we propose to set a threshold value to diminish the problem of round off *** resultant adaptive algorithm based on this strategy is Non-linear Least mean square(NL2MS)***,to improve this algorithm in terms of ltering capability we perform data normalization,using this algorithm several hybrid versions are developed to improve ltering and reduce computational *** the method,a new signal enhancement unit(SEU)is realized and performance of various hybrid versions of algorithms examined using real EEG signals recorded from the *** ability of the proposed schemes is measured in terms of convergence,enhancement and multiplications *** various SEUs,the MCN2L 2MS algorithm achieves 14.6734,12.8732,10.9257,15.7790 dB during the artifact removal of RA,EMG,CSA and EBA components with only two ***,this algorithm seems to be better candidate for artifact elimination.

关键词： Adaptive algorithms artifacts brain waves clipped algorithms signal enhancement unit wireless EEG monitoring

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Analysis of vibrational spectra of nano-bio molecules: Application to metalloporphrins

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Chinese Physics B 2013年第9期22卷 225-232页

作者： k.srinivasa rao G srinivas J.Vijayasekhar V.U.M.rao Y.srinivas k.Sunil Babu V.Sunndadara Siva kumar A.Hanumaiah Department of Electronics & Instrumentation Engineering Lakireddy Bali Reddy College of Engineering Department of Physics KL University Research Scholar Department of MathematicsJawaharlal Nehru Technological University Department of Applied Mathematics College of Science & TechnologyAndhra University Department of Computer Science GITAM University Department of Physics Miracle Engineering College Department of Electronics & Instrumentation Rajeev Gandhi Memorial Engineering College Department of Physics Lara's Vignan Institute of Technology and Science

In this paper, we have applied the Lie algebraic model to nano-bio molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The determined vibrational energy levels by the Lie algebraic model are compared with the experimental data. The results from the theoretical mode[ are consistent with the experimental data. The vibrational energy levels are clustering in the excited states.

关键词： Lie algebraic model vibrational spectra vibrational modes metalloporphyrins

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Dolochar as a reductant in the reduction roasting of iron ore slimes

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International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1341-1351页

作者： Swagat S. Rath Danda srinivas rao Institute of Minerals and Materials Technology Council of Scientific&Industrial ResearchBhubaneswar 751013India

The present investigation examines the viability of dolochar, a sponge iron industry waste material, as a reductant in the reduction roasting of iron ore slimes, which are another waste generated by iron ore beneficiation plants. Under statistically determined optimum conditions, which include a temperature of 900°C, a reductant-to-feed mass ratio of 0.35, and a reduction time of 30–45 min, the roasted mass, after being subjected to low-intensity magnetic separation, yielded an iron ore concentrate of approximately 64 wt% Fe at a mass recovery of approximately 71% from the feed iron ore slime assaying 56.2 wt% Fe. X-ray diffraction analyses indicated that the magnetic products contain magnetite and hematite as the major phases, whereas the nonmagnetic fractions contain quartz and hematite.

关键词： iron ore slime reduction roasting dolochar reductant magnetic separation

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Inflammation and dry eye disease——where are we?

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International Journal of Ophthalmology(English edition) 2022年第5期15卷 820-827页

作者： srinivas k rao Rishi Mohan Nikhil Gokhale Himanshu Matalia Paras Mehta Darshan Eye Care&Surgical Centre ChennaiTamil NaduIndia MM Eyetech Institute of Ophthalmology New DelhiIndia Gokhale Eye Hospital MumbaiMaharashtraIndia Narayana Nethralaya Electronic CityBangaloreKarnatakaIndia Sameep Eye Hospital and Corneal Center VadodaraGujaratIndia

The presence of inflammation in dry eye disease(DED)results in increased patient symptomatology,ocular surface damage and worsening tear *** also affects the health of meibomian glands and their secretions which further aggravates ocular surface *** article reviews current knowledge regarding ocular surface inflammation in DED and explores the relationships between the vicious cycles of DED,inflammation and meibomian gland dysfunction(MGD).The clinical evaluation of eyes with such changes,markers that identify the presence of inflammation on the ocular surface and current treatment options are discussed.

关键词： dry eye disease inflammation meibomian gland dysfunction vicious cycle ocular surface disease

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Effectiveness of sodium silicate as gangue depressants in iron ore slimes flotation

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 515-522页

作者： Danda srinivas rao Tadiparthi Venkata Vijayakumar Sripada Subba rao Swarna Prabhakar Guntamadugu Bhaskar Raju National Metallurgical Laboratory-Madras Centre Council of Scientific and Industrial Research-Madras ComplexChennai 600 113India

The recovery of iron from the screw classifier overflow slimes by direct flotation was studied. The relative effectiveness of sodium silicates with different silica-to-soda mole ratios as depressants for silica and silicate bearing minerals was investigated. Silica-to-soda mole ratio and silicate dosage were found to have significant effect on the separation efficiency. The results show that an increase of Fe content in the concentrate is observed with concomitant reduction in SiO2 and A1203 levels when a particular type of sodium silicate at a proper dosage is used. The concentrate of 58.89wt% Fe, 4.68wt% SiO2, and 5.28wt% A1203 with the weight recovery of 38.74% and the metal recovery of 41.13% can be obtained from the iron ore slimes with 54.44wt% Fe, 6.72wt% SiO2, and 6.80wt% A1203, when NazSiO3 with a silica-to-soda mole ratio of 2.19 is used as a depressant at a feed rate of 0.2 kg/t.

关键词： iron ores sodium silicate depressants flotation

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Unilateral visual impairment in rural south India-Andhra Pradesh Eye Disease Study(APEDS)

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International Journal of Ophthalmology(English edition) 2016年第5期9卷 763-767页

作者： srinivas Marmamula Rohit C khanna Gullapalli N rao Allen Foster Community Eye Health Research Centre Gullapalli Pratibha Rao-International Centre for Advancement of Rural Eye careL V Prasad Eye Institute Brien Holden Eye Research Centre L V Prasad Eye Institute School of Optometry & Vision Science University of New South Wales

AIM： To report the prevalence and causes of unilateral visual impairment（UVI） in rural population of all ages in rural Andhra Pradesh, India.·METHODS： A population-based cross sectional study using a multi-stage cluster sampling methodology was carried out in West Godavari, Adilabad and Mahbubnagar districts in south India. A comprehensive eye examination that included presenting and best corrected visual acuity and dilated fundus examination was conducted by trained professionals. UVI is defined as presenting visual acuity 6/18 in one eye but ≥6/18 in other eye. Multiple logistic regression analysis was used to test association of UVI with socio-demographic risk factors.· RESULTS： Data were analyzed for 6634/7771 participants after excluding those with bilateral visual impairment. The mean age of the participants was 27.4y（Standard deviation： 17.9y）, 51.9% were women and49.1% were educated. The prevalence of UVI was 7.8%（95% CI： 7.2%- 8.5%）. Uncorrected refractive error（60.8%）, cataract（17.4%） and retinal causes（6.6%） were the leading causes of UVI. On multiple logistic regression analyses, older age, not having education, living in welloff district had significantly higher odds of being associated with UVI. UVI was not associated with gender.·CONCLUSION： UVI is common in rural south *** of it is due to cataract and refractive errors, both of which can be addressed at primary and secondary levelsof eye care. Burden of UVI should also be considered in planning eye care services.

关键词： visual impairment cataract refractive errors India Andhra Pradesh Eye Disease Study

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One Pot Reduction of Imines Generated in-situ from Aldehydes and Amines by the NaBH4-InCl3 System

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Chinese Journal of Chemistry 2006年第6期24卷 807-810页

作者： RAVI, Varala RAMU, Enugala VIJAY kUMAR, Ponnamaneni srinivas rao, Adapa Indian Institute of Chemical Technology Hyderabad-500 007 India

A combination of sodium borohydride and a catalytic amount of indium（Ⅲ） chloride in acetonitrile reduces imines formed in-situ from aldehydes and amines to the corresponding functionalised secondary and tertiary amines in moderate to good yields. Noteworthy is that highly chemoselective reactions were achieved in the presence of other functional groups such as halogens, carbon-carbon double bonds and hydroxyl groups.

关键词： NaBH4-InCl3 aldehyde amine One Pot Reduction

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Long-term outcomes of endothelial keratoplasty in Chinese eyes at a University Hospital

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Eye and Vision 2014年第1期1卷 51-54页

作者： Alvin L Young Rachel PW kwok Vishal Jhanji Lulu L Cheng srinivas k rao Department of Ophthalmology and Visual Sciences The Chinese University of Hong KongPrince of Wales HospitalShatinHong KongChina Darshan Eye Clinic ChennaiIndia.

Background:Endothelial keratoplasty(Ek)is used increasingly for the management of cases with endothelial ***-term outcomes of the surgery are not widely reported in the *** report our experience of Ek in Chinese eyes at a University teaching ***:Retrospective analysis was performed for all cases of Ek performed between 2005 and *** analyzed included indication for surgery,associated surgical procedures,complications,best-corrected visual acuity(BCVA)and overall graft ***:Overall,22 eyes of 21 patients underwent Ek(13 males,8 females,mean age 71.8±11.3 years).Pseudophakic bullous keratopathy was the leading indication for surgery(n=12)followed by Fuchs’endothelial dystrophy(n=4),or both(n=3).Other indications for surgery included failed penetrating keratoplasty(n=2)and endothelial decompensation due to multiple surgeries(n=1).Triple procedure was performed in 5(22.7%)*** were noted in the form of postoperative interface hemorrhage(n=2,9%)and graft dislocation(n=1,4.5%).The mean postoperative endothelial cell density was 1069±585.8 cells/*** mean postoperative pachymetry was 675.8±108.5μ*** mean preoperative and postoperative intraocular pressure was 11.3±3.2 and 13.9±4.5 mmHg *** the last follow-up(mean,47.4±13.7 months),BCVA was≥20/70 in 9(40.9%)*** of poor BCVA included primary graft failure(n=4),graft decompensation(n=4),advanced glaucoma(n=2)and irreversible graft rejection(n=2).Graft remained clear in 12(54.5%)cases at the last *** graft survival was 19.7±17.7 months(median 17.5 months).Conclusions:Nearly half of the Ek grafts in our study survived over a period of five *** failure,glaucoma and graft rejection were the main causes of poor graft survival.

关键词： Endothelial keratoplasty keratoplasty Long-term outcomes

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Beneficiation of a low grade limestone sample

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Mining Science and Technology 2011年第5期21卷 631-636页

作者： rao Danda srinivas Vijayakumar Tadiparthi Venkata Subba rao Sripada Bhaskar Raju Guntamadugu Prabhakar Swarna National Metallurgical Laboratory Madras Centre CSIR Madras Complex Chennai 600 113 India

Pilot scale column flotation studies were conducted on a low grade siliceous limestone ore. Silica content was reduced to less than 13g in the concentrate so that it became satisfactory for use in the paper or rubber industries. The limestone sample was crystalline and constituted primarily of calcite that contained quartz, feldspar, pyroxene, and biotite as gangue minerals. Quartz is the major silicate gangue whereas feldspar, pyroxene, and biotite exist in minor to trace quantities. Traces of pyrite were also observed within the sample. A reverse flotation process was adopted where the silicate gangue minerals were floated using two different commercial cationic collectors： Chem-750 F or Floatamine-D. The studies clearly suggest it is possible to produce a limestone concentrate assaying around 96-97% CaCO3 containing less than 1 % Si02. The effect of feed flow rate, percent solids, froth depth, and wash water on the grade and recovery of the CaC03 concentrate is discussed.

关键词： Low grade limestoneReverse flotationColumn flotationCationic collector

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