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Combined pars plana vitrectomy and suture less scleral fixation of foldable intraocular lens:single surgery visual rehabilitation of dislocated lens/intraocular lens

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Annals of Eye Science 2017年第1期2卷 90-96页

作者： Brijesh Takkar Shorya Vardhan Azad Neelima Aron ravi bypareddy Rajvardhan Azad Dr.Rajendra Prasad Centre for Ophthalmic Sciences AIIMSNew DelhiIndia Bharti Eye Hospital New DelhiIndia

Background:To evaluate efficacy and safety of combined pars plana vitrectomy(PPV)and scleral fixated intraocular lens(SFIOL)surgery as a single ***:Retrospective interventional case series done at a tertiary eye care center in Northern *** patients who underwent combined PPV and SFIOL surgery were included and analyzed ***:Mean age of the patients was 43.36±15.12 years(range,22-64 years).Eight were *** baseline best corrected visual acuity(BCVA)was 0.78±0.63 logMAR units while the mean post-operative BCVA at 6 months follow-up was 0.37±0.29 logMAR units,the visual gain being statistically significant(P=0.021).None of the patients had a drop in BCVA with nine patients having final BCVA better than 0.48 logMAR *** detachment(CD)was the only notable complication,seen in three *** complications included two cases of intraoperative retinal breaks,a case each of reversible corneal edema,ocular hypertension and cystoid macular ***:Combined PPV and SFIOL is an efficacious procedure for managing IOL/lens dislocation and aphakia in a single *** may be short-term reversible complications with no impact on final visual gain.

关键词： Pars plana vitrectomy(PPV) intraocular lens(IOL) posterior segment anterior segment surgery intraocular lens implantation(IOL implantation) intraocular lens surgery(IOL surgery) lens surgery

Delayed presentation of intracameral graphite foreign body in a child: school trauma

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Eye Science 2016年第3期31卷 189-191页

作者： Brijesh Takkar Shorya Vardhan Azad ravi bypareddy Sudarshan Khokhar Dr.R.P.Center AIIMS

We report a case of large graphite foreign body(FB) in the anterior chamber of eye of a 4-yearold child,incurred during unsupervised *** delayed presentation,the eye had few signs of resolved inflammation which allowed safe extraction of the FB bimanually through *** play,especially in young children,should be under supervision and free of sharp *** is inert while inside the eye,and even large pieces can be well tolerated for long time in absence of infection.

关键词： Graphite foreign body intraocular foreign body in children school trauma

Global Piecewise Analysis of HIV Model with Bi-Infectious Categories under Ordinary Derivative and Non-Singular Operator with Neural Network Approach

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 609-633页

作者： Ghaliah Alhamzi Badr Saad TAlkahtani ravi Shanker Dubey Mati ur Rahman Department of Mathematics and Statistics College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh13318Saudi Arabia Department of Mathematics College of ScienceKing Saud UniversityRiyadh11989Saudi Arabia Department of Mathematics Amity School of Applied SciencesAmity University RajasthanJaipur302002India School of Mathematical Sciences Jiangsu UniversityZhenjiang212013China Department of Computer Science and Mathematics Lebanese American UniversityBeirut13-5053Lebanon

This study directs the discussion of HIV disease with a novel kind of complex dynamical generalized and piecewise operator in the sense of classical and Atangana Baleanu(AB)derivatives having arbitrary *** HIV infection model has a susceptible class,a recovered class,along with a case of infection divided into three sub-different levels or categories and the recovered *** total time interval is converted into two,which are further investigated for ordinary and fractional order operators of the AB derivative,*** proposed model is tested separately for unique solutions and existence on bi *** numerical solution of the proposed model is treated by the piece-wise numerical iterative scheme of Newtons *** proposed method is established for piece-wise derivatives under natural order and non-singular Mittag-Leffler *** cross-over or bending characteristics in the dynamical system of HIV are easily examined by the aspect of this research having a memory effect for controlling the said *** study uses the neural network(NN)technique to obtain a better set of weights with low residual errors,and the epochs number is considered *** obtained figures represent the approximate solution and absolute error which are tested with NN to train the data accurately.

关键词： HIV infection model qualitative scheme approximate solution piecewise global operator neural network

Impact of Pollutant Concentration and Particle Deposition on the Radiative Flow of Casson-Micropolar Fluid between Parallel Plates

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 665-690页

作者： Ghaliah Alhamzi Badr Saad T.Alkahtani ravi Shanker Dubey Vinutha Kalleshachar Neelima Nizampatnam Department of Mathematics and Statistics College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11564Saudi Arabia Department of Mathematics College of ScienceKing Saud UniversityRiyadh11989Saudi Arabia Department of Mathematics Amity School of Applied SciencesAmity University RajasthanJaipur302002RajasthanIndia Department of Studies in Mathematics Davangere UniversityDavangere577002India Department of Electronics and Communication Engineering Amrita School of EngineeringAmrita Vishwa VidyapeethamBengaluru560035India

Assessing the behaviour and concentration of waste pollutants deposited between two parallel plates is essential for effective environmental *** the effectiveness of treatment methods in reducing pollution scales is made easier by analysing waste discharge *** waste discharge concentration analysis is useful for assessing how effectively wastewater treatment techniques reduce pollution *** study aims to explore the Casson micropolar fluid flow through two parallel plates with the influence of pollutant concentration and thermophoretic particle *** explore the mass and heat transport features,thermophoretic particle deposition and thermal radiation are *** governing equations are transformed into ordinary differential equations with the help of suitable similarity *** Runge-Kutta-Fehlberg’s fourthfifth order technique and shooting procedure are used to solve the reduced set of equations and boundary *** integration of a neural network model based on the Levenberg-Marquardt algorithm serves to improve the accuracy of predictions and optimize the analysis of *** outcomes are displayed to analyze the characteristics of the relevant dimensionless parameters in the current *** reveal that concentration upsurges as the micropolar parameter *** concentration reduces with an upsurge in the thermophoretic *** upsurge in the external pollutant source variation and the local pollutant external source parameters enhances mass *** surface drag force declines for improved values of porosity and micropolar parameters.

关键词： Micropolar fluid thermal radiation porous medium thermophoretic particle deposition waste discharge concentration

Optimizing bone marrow harvesting sites for enhanced mesenchymal stem cell yield and efficacy in knee osteoarthritis treatment

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World Journal of Methodology 2025年第2期15卷 92-107页

作者： Arulkumar Nallakumarasamy Sandeep Shrivastava ravi Velamoor Rangarajan Naveen Jeyaraman Avinash Gandi Devadas Swaminathan Ramasubramanian Madhan Jeyaraman Department of Orthopaedics Datta Meghe Institute of Higher Education and ResearchWardha 442004MaharashtraIndia Department of Regenerative Medicine Mother Cell Regenerative CentreTiruchirappalli 620017Tamil NaduIndia Department of Orthopaedics Government Medical CollegeOmandurar Government EstateChennai 600002Tamil NaduIndia Department of Orthopaedics ACS Medical College and HospitalDr MGR Educational and Research InstituteChennai 600077Tamil NaduIndia

Knee osteoarthritis(OA)is a debilitating condition with limited long-term treatment *** therapeutic potential of mesenchymal stem cells(MSCs),particularly those derived from bone marrow aspirate concentrate,has garnered attention for cartilage repair in *** the iliac crest is the traditional site for bone marrow harvesting(BMH),associated morbidity has prompted the exploration of alternative sites such as the proximal tibia,distal femur,and proximal *** paper reviews the impact of different harvesting sites on mesenchymal stem cell(MSC)yield,viability,and regenerative potential,emphasizing their relevance in knee OA *** iliac crest consistently offers the highest MSC yield,but alternative sites within the surgical field of knee procedures offer comparable MSC characteristics with reduced *** integration of harvesting techniques into existing knee surgeries,such as total knee arthroplasty,provides a less invasive approach while maintaining thera-peutic ***,variability in MSC yield from these alternative sites underscores the need for further research to standardize techniques and optimize clinical *** directions include large-scale comparative studies,advanced characterization of MSCs,and the development of personalized harvesting ***,the findings suggest that optimizing the site of BMH can significantly influence the quality of MSC-based therapies for knee OA,enhancing their clinical utility and patient outcomes.

关键词： Knee Osteoarthritis Mesenchymal stem cells Bone marrow harvest Regenerative medicine

Effect of local longitudinal shortening on the transport of luminal contents through small intestine

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Acta Mechanica Sinica 2019年第1期35卷 45-60,I0002页

作者： ravi Kant Avvari Sasi Institute of Technology and Engineering Tadepalligudem 534101India

A theoretical analysis of the rheological fluid flow due to peristalsis is studied. We have applied the classical lubrication theory to predict the near physiological behavior of the intestinal segment, mixing and transport. A parametric study involving the changes in local longitudinal shortening (LLS) magnitude, LLS spacing, fluid viscosity, wavelength of the wave, and occlusion of lumen caused by the wave provided insights into the dynamics of the peristalsis flow of a non-Newtonian fluid. LLS appear to have little significance in modulating the flow patterns that are caused by circular contraction alone. Results also indicate that there exists trade-off between the power requirement for peristalsis at a certain occlusion against the percentage LLS. LLS appear to be more advantageous to perform the peristalsis activity at higher occlusion than lower occlusion. Having mucosal folds in the inner lining of the intestine allows for one more advantage of slowing the transit due to increased friction factor and increase in time for absorption of the nutrients.

关键词： Circular contraction Local longitudinal shortening Lubrication theory

Multiferroism in Pr_2FeCrO_6 perovskite

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Journal of Rare Earths 2018年第11期36卷 1175-1178页

作者： S.ravi Department of Physics Mepco Schlenk Engineering College

Pr2FeCrO6 perovskite crystallizes in an orthorhombic structure with R3c space group. Magnetic stuay nas revealed that Pr2FeCrO6 exhibits room-temperature ferromagnetism with a Curie temperature of about 562 K. Pr2FeCrO6 also exhibits weak ferroelectricity. Thus, given its ferroelectric and ferromagnetic na- ture, the Pr2FeCrO6 material can be considered as a multiferroic. In addition, due to its high Curie temperature and multiferroicity, it could be a promising candidate for spintronics applications.

关键词： Magnetic materials Double perovskite Magnetoresistance Spintronics Rare earths

Exploring nitrogen reduction reaction mechanisms in electrocatalytic ammonia synthesis:A comprehensive review

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Journal of Energy Chemistry 2024年第5期92卷 681-697页

作者： Abhishek Umesh Shetty ravi Sankannavar School of Chemical and Materials Science Indian Institute of Technology GoaFarmagudiPonda 403401GoaIndia Department of Chemical Engineering M.S.Ramaiah Institute of TechnologyMSR NagarMSRIT PostBengaluru 560054KarnatakaIndia

The electrochemical nitrogen reduction reaction(eNRR)holds significant promise as a sustainable alternative to the conventional large-scale Haber Bosch process,offering a carbon footprint-free approach for ammonia *** the process is thermodynamically feasible at ambient temperature and pressure,challenges such as the competing hydrogen evolution reaction,low nitrogen solubility in electrolytes,and the activation of inert dinitrogen(N_(2))gas adversely affect the performance of ammonia *** hurdles result in low Faradaic efficiency and low ammonia production rate,which pose obstacles to the commercialisation of the *** have been actively designing and proposing various electrocatalysts to address these issues,but challenges still need to be resolved.A key strategy in electrocatalyst design lies in understanding the underlying mechanisms that govern the success or failure of the electrocatalyst in driving the electrochemical *** mechanistic studies,we gain valuable insights into the factors affecting the reaction,enabling us to propose optimised designs to overcome the *** review aims to provide a comprehensive understanding of the various mechanisms involved in eNRR on the electrocatalyst *** delves into the various mechanisms such as dissociative,associative,Mars-van Krevelen,lithium-mediated nitrogen reduction and surface hydrogenation mechanisms of nitrogen *** unravelling the intricacies of eNRR mechanisms and exploring promising avenues,we can pave the way for more efficient and commercially viable ammonia synthesis through this sustainable electrochemical process by designing an efficient electrocatalyst.

关键词： Green ammonia synthesis Electrolysis Electrocatalysis Nitrogen reductionreaction Electrochemical reaction pathways Reactionmechanism

The bioinformatics of next generation sequencing:a meeting report

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Journal of Molecular Cell Biology 2011年第3期3卷 147-150页

作者： ravi Shankar Studio of Computational Biology&Bioinformatics Institute of Himalayan Bioresource TechnologyCouncil of Scientific&Industrial Research(CSIR)PalampurHimachal PradeshIndia

The Studio of Computational Biology&Bioinformatics(SCBB),IHBT,CSIR,Palampur,India organized one of the very first national workshop funded by DBT,*** India,on the Bioinformatics issues associated with next generation sequencing *** course structure was designed by SCBB,*** workshop took place in the IHBT premise on 17 and 18 June 2010.

关键词： struc India workshop