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Modelling,Analysis and Computation in Plasticity

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Acta Mathematica Sinica,English Series 2019年第1期35卷 64-82页

作者： B.Daya reddy Department of Mathematics and Applied Mathematics University of Cape Town

The typical problem in the mechanics of deformable solids comprises a mathematical model in the form of systems of partial differential equations or inequalities. Subsequent investigations are then concerned with analysis of the model to determine its well-posedness, followed by the development and implementation of algorithms to obtain approximate solutions to problems that are generally intractable in closed form. These processes of modelling, analysis, and computation are discussed with a focus on the behaviour of elastic-plastic bodies;these are materials which exhibit path-dependence and irreversibility in their behaviour. The resulting variational problem is an inequality that is not of standard elliptic or parabolic type. Properties of this formulation are reviewed, as are the conditions under which fully discrete approximations converge. A solution algorithm, motivated by the predictor-corrector algorithms that are common in elastoplastic problems, is presented and its convergence properties summarized. An important extension of the conventional theory is that of straingradient plasticity, in which gradients of the plastic strain appear in the formulation, and which includes a length scale not present in the conventional theory. Some recent results for strain-gradient plasticity are presented, and the work concludes with a brief description of current investigations.

关键词： Elastoplasticity variational inequalities finite elements algorithms convergence pre-dictor-corrector schemes strain-gradient plasticity

Synthesis and characterization of Y and Dy co-doped ceria solid electrolytes for IT-SOFCs:a microwave sintering

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Rare Metals 2021年第11期40卷 3329-3336页

作者： Ch.Madhusudan Venkataramana kasarapu Madhuri Chittimadula Y.Suresh reddy C.Vishnuvardhan reddy Department of Physics Osmania UniversityHyderabadTelangana 500007India

In this communication,the electrical conductivities and thermal expansion studies of microwave sintered co-doped ceria Ce_(0.8)Y_(0.2-x)Dy_(x)O_(2-δ)(x=0,0.05,0.10,0.15 and 0.20) solid electrolyte materials for intermediate temperature solid oxide fuel cells(IT-SOFCs)synthesized by sol-gel auto-combustion method were *** sintering at 1300℃ for 30 min was used for making dense powder *** relative densities of all the samples are noticed above 95%.Raman spectrum was characterized by the presence of a very strong band near 460 cm^(-1),which along with X-ray diffraction(XRD) analysis ascertain the sample formation with a single-phase cubic fluorite *** lattice parameter values were calculated from XRD *** images show nearly uniform grains with distinct grain *** thermal expansion coefficients(TECs) are found to vary linearly with temperature and were measured in the range from 14.15 to 13.20×10^(-6)℃^(-1).The investigation on total ionic conductivity(TIC) was executed with variation in dopant concentration and relative oxygen *** impedance analysis reveals that the sample Ce_(0.80)Y_(0.10)Dy_(0.10)O_(2-δ) displays the highest TIC,i.e.,7.5×10^(-3) S·cm^(-1) at 500℃ and minimum activation energy 0.90 eV compared to *** the highest TIC and minimum activation energy,the Ce_(0.80)Y_(0.10)Dy_(0.10)O_(2-δ)might be the possible material as the solid electrolyte in intermediate temperature SOFCs.

关键词： Microwave sintering Ionic conductivity Co-doped ceria Solid electrolyte Intermediate temperature solid oxide fuel cells

Developing an Integrated IoT Cloud Based Predictive Conservation Model for Asset Management in Industry 4.0

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Journal of Social Computing 2023年第2期4卷 139-149页

作者： karnam Shanmugam kachhti satyam Thimma reddy Sreenivasula reddy the Department of Computer Applications Annamacharya Institute of Technology and SciencesKarakambadiTirupathi 517520India the Department of Computer Science and Engineering Annamacharya Institute of Technology and SciencesKarakambadiTirupathi 517520India

With the advent of Industry 4.0(I4.0),predictive maintenance(PdM)methods have been widely adopted by businesses to deal with the condition of their *** the help of I4.0,digital transformation,information techniques,computerised control,and communication networks,large amounts of data on operational and process conditions can be collected from multiple pieces of equipment and used to make an automated fault detection and diagnosis,all with the goal of reducing unscheduled maintenance,improving component utilisation,and lengthening the lifespan of the *** this paper,we use smart approaches to create a PdM planning *** five key steps of the created approach are as follows:(1)cleaning the data,(2)normalising the data,(3)selecting the best features,(4)making a decision about the prediction network,and(5)producing a *** the outset,PdM-related data undergo data cleaning and normalisation to get everything in order and within some kind of *** next step is to execute optimal feature selection in order to eliminate unnecessary *** research presents the golden search optimization(GSO)algorithm,a powerful population-based optimization technique for efficient feature *** first phase of GSO is to produce a set of possible solutions or objects at *** objects will then interact with one another using a straightforward mathematical model to find the best feasible *** to the wide range over which the prediction values fall,machine learning and deep learning confront challenges in providing reliable *** is why we recommend a multilayer hybrid convolution neural network(MLH-CNN).While conceptually similar to VGGNet,this approach uses fewer parameters while maintaining or improving classification correctness by adjusting the amount of network modules and *** projected perfect is evaluated on two datasets to show that it can accurately predict the future state of components for upkeep prepara

关键词： Industry 4.0 predictive maintenance golden search optimization multilayer hybrid convolution neural network data cleaning

Molybdenum disulfide and magnesium oxide nanoparticle performance on micropolar Cattaneo-Christov heat flux model

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Applied Mathematics and Mechanics(English Edition) 2021年第4期42卷 541-552页

作者： M.G.reddy S.A.SHEHZAD Department of Mathematics Acharya Nagarjuna University CampusOngole 523001Andhra PradeshIndia Department of Mathematics COMSATS University IslamabadSahiwal 57000Pakistan

This article intends to illustrate the Darcy flow and melting heat transmission in micropolar *** major advantage of micropolar fluid is the liquid particle rotation through an independent kinematic vector named the microrotation *** novel aspects of the Cattaneo-Christov(C-C)heat flux and Joule heating are incorporated in the energy transport *** different nanoparticles,namely,MoS2 and MgO,are suspended into the *** governing partial differential equations(PDEs)of the prevailing problem are slackening into ordinary differential expressions(ODEs)via similarity *** resulting mathematical phenomenon is illustrated by the implication of fourth-fifth order Runge-Kutta-Fehlberg(RKF)*** fluid velocity and temperature distributions are deliberated by using graphical phenomena for multiple values of physical *** results are displayed for both molybdenum disulphide and magnesium oxide nanoparticles.A comparative benchmark in the limiting approach is reported for the validation of the present *** is revealed that the incrementing material constraint results in a higher fluid velocity for both molybdenum disulphide and magnesium oxide nanoparticle situations.

关键词： micropolar fluid Cattaneo-Christov(C-C)heat flux molybdenum disulphide nanoparticle melting effect numerical solution

Effects of Phosphate-Solubilizing Bacteria, Rock Phosphate and Chemical Fertilizers on Maize-Wheat Cropping Cycle and Economics

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Pedosphere 2015年第3期25卷 428-437页

作者： Gurdeep kaUR Mondem Sudhakara reddy Department of Biotechnology Thapar University

A two-year field study was conducted to test the effects of two phosphate-solubilizing bacteria(PSB), Pantoea cypripedii(PSB-3)and Pseudomonas plecoglossicida(PSB-5), inoculated singly or together with rock phosphate(RP) fertilization on maize and wheat cropping cycle by comparing with chemical P fertilizer(diammonium phosphate, DAP), mainly in the crop yield, soil fertility and economic returns. Inoculation of PSB together with RP fertilization increased the crop growth in terms of shoot height, shoot and root dry biomass, grain yield and total P uptake in both maize and wheat crops compared to the other treatments. Soil fertility in the context of available P, enzyme activities and PSB population in both maize and wheat crops was significantly improved with PSB inoculation together with RP fertilization compared to DAP treatment. The combined use of PSB inoculation and RP fertilization was more economical due to minimal cost and maximum returns. These results suggested that PSB inoculation along with RP fertilization would be an appropriate substitute for chemical phosphate fertilizer application in sustainable agriculture systems.

关键词： diammonium phosphate Pantoea cypripedii Pseudomonas plecoglossicida soil fertility sustainable agriculture

Design,synthesis and screening of some novel benzoxazole based 1,3,4-oxadiazoles as potential antimicrobial agents

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Chinese Chemical Letters 2013年第7期24卷 625-628页

作者： Sunil Vodela Raghu Vardhan reddy Mekala Ravinder reddy Danda Venkateshwarlu Kodhati Talla Padmavathi College of Engineering SomidiKazipet 506003Andhra PradeshIndia Department of Chemistry Kakatiya UniversityWarangal 506009Andhra PradeshIndia Department of Chemistry Mahathma Gandhi UniversityNalgonda 508254Andhra PradeshIndia Vaagdevi College of Pharmacy RamnagarHanamkonda 506001Andhra PradeshIndia

A series of novel 2-（5-substituted-[ 1,3,4]oxadiazol-2-yl）-benzoxazoles （Ta-h） were synthesized in good yields in two different directions by involving benzoxazole-2-carboxylic acid （1） as raw material and benzoxazole-2-carbonyl chloride （2）, benzoxazole-2-carboxylic acid methyl ester （3）, benzoxazole-2- carboxylic acid hydrazide （4）, benzoxazole-2-carboxylic acid N＇-acetyl hydrazide （sa-d） and benzoxazole-2-carboxylic acid-ethylidene-hydrazides （6a-d） as reactive intermediates. The chemical structures of all the synthesized compounds were elucidated by their IR, 1H NMR and 13C NMR and mass spectral data. Further, the target compounds were screened for their antimicrobial activity against various Gram-positive and Gram-negative bacteria.

关键词： Benzoxazoles 1 3 4-Oxadiazoles Antimicrobial activity

Extracorporeal shock wave lithotripsy for pancreatic and large common bile duct stones

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World Journal of Gastroenterology 2011年第39期17卷 4365-4371页

作者： Manu Tandan D Nageshwar reddy reddy Asian Institute of Gastroenterology 6-3-652 SomajigudaHyderabad 500 082India

Extraction of large pancreatic and common bile duct(CBD)calculi has always challenged the therapeutic *** shockwave lithotripsy(ESWL)is an excellent tool for patients with large pancreatic and CBD calculi that are not amenable to routine *** calculi in the head and body are targeted by ESWL,with an aim to fragment them tosalinea simple maneuver which helps to facilitate *** aim is to fragment calculi tosame during *** clearance of the CBD was achieved in 84.4%of and partial clearance in 12.3%of 283 *** than 90%of the patients with pancreatic and biliary calculi needed three or fewer sessions of ESWL with 5000 shocks being de-livered at each *** use of epidural anesthesia helped in reducing patient ***,together with the better focus achieved with newer third-gen-eration lithotripters,prevents collateral tissue damage and minimizes the *** in our experience with nearly 1300 patients were minimal,and no extension of hospital stay was *** rates of clearance of pancreatic and biliary calculi with minimal adverse effects have been reported from the centers where ESWL is performed *** view of its high efficiency,non-invasive nature and low complication rates,ESWL can be offered as the first-line therapy for selected patients with large pancreatic and CBD calculi.

关键词： Pancreatic calculi Extracorporeal shock-wave lithotripsy Common bile duct calculi

Enhanced hydrogen production activity over BiOX–TiO2 under solar irradiation:Improved charge transfer through bismuth oxide clusters

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Journal of Energy Chemistry 2017年第3期26卷 390-397页

作者： Police Anil Kumar reddy Chennaiahgari Manvitha Pullagurala Venkata Laxma reddy Ki-Hyun Kim Valluri Durga Kumari Department of Civil&Environmental Engineering Hanyang University222WangsimniRoSeoul 133-791Republic of Korea Inorganic and Physical Chemistry Division Indian Institute of Chemical TechnologyHyderabad 500 607India sarojini Naidu Vanitha Mahavidyala Osmania UniversityHyderabad 500 001India Program in Environmental Science and Engineering University of Texas El PasoEl PasoTexas 799038USA

A series of titania nanoparticles and nanotubes deposited with various quantities of bismuth（Bi） were prepared via sol-gel and hydrothermal methods, respectively. They were then characterized using X-ray diffraction spectroscopy（XRD）, X-ray photo electron spectroscopy（XPS）, UV–Vis diffused reflectance spectra（DRS）, photoluminescence spectra（PLS）, transmission electron microscopy（TEM）, energy dispersive analysis of X-rays（EDAX）, and BET surface analysis. These catalysts were employed for the photocatalytic production of hydrogen from a mixture of pure water and glycerol under solar light irradiation. The presence of the Bispecies was found to play a vital role in enhancing activity while minimizing electron hole recombination（relative to bare TiO）. The nanotubes exhibited better activity than the nanoparticles of Bi-deposited TiO, showing the significance of the morphology; however, photocatalytic activity is predominantly dependent on the deposition of bismuth. The activity increased by approximately an order of magnitude at the optimum concentration of Bi deposited over TiO（2 wt%）. The presence of the Bispecies played a vital role in minimizing electron hole recombination, resulting in higher activity compared to bare TiO.

关键词： Bismuth TiO2 nanotubes Visible photocatalysis Water splitting Hydrogen

Development of cost effective personnel armour through structural hybridization

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Defence Technology（防务技术） 2020年第6期16卷 1089-1097页

作者： P.Rama Subba reddy T.Sreekantha reddy I.Srikanth Juhi Kushwaha V.Madhu Defence Metallurgical Research Laboratory Hyderabad500058India Advanced Systems Laboratory Hyderabad500058India

The objective of the present study is to develop cost effective thermoplastic hybrid laminate using Dyneema®HB50 and Tensylon®HSBD 30A through structural hybridization *** having 20 mm thickness were fabricated and subjected to 7.6239 mm mild steel core projectile with an impact velocity of 730±10 ms*** such as energy absorption,back face deformation and rate of back face deformation were measured as a function of hybridization *** was observed that hybrid laminate with 50:50 ratio(w/w)of Tensylon®and Dyneema®with Tensylon®as front face showed 200%more energy absorption when compared to 100%Tensylon®laminate and showed equal energy absorption as that of expensive 100%Dyneema®***,hybrid laminate with TD50:50 ratio showed 40%lower in terms of final back face deformation than Dyneema®*** of back face deformation was also found to be slow for hybrid laminate as compared to Dyneema®*** mechanical analysis showed that,Tensylon®laminate has got higher stiffness and lower damping factor than Dyneema®and hybrid *** interface between Tensylon®and Dyneema®layers was found to be separating during the penetration process due to the poor interfacial *** behaviour of laminates for different hybridization ratios were studied by sectioning the impacted *** was observed that,the Tensylon®laminate has undergone shear cutting of fibers as major failure mode whereas the hybrid laminate showed shear cutting followed by tensile stretching,fiber pull out and *** inputs are highly useful for body armour applications to design cost effective armour with enhanced performance.

关键词： Dyneema® Tensylon® Hybrid laminate Ballistic impact Energy absorption Back face signature