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Elastoplastic analysis of AA7075-O aluminum sheet by hybrid micro-scale representative volume element modeling with really-distributed particles and in-situ SEM experimental testing

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Journal of Materials Science & Technology 2022年第28期123卷 201-221页

作者： Qingping Sun Shahryar Asqardoust Abhishek Sarmah Mukesh K.jain College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China Department of Mechanical Engineering McMaster UniversityHamiltonON L8S4L7Canada

This paper addresses the challenge of reconstructing randomly distributed second-phase particlestrengthened microstructure of AA7075-O aluminum sheet material for computational *** particle characteristics in 3D space were obtained from focused ion beam and scanning electron microscopy(FIB-SEM)and SEM-based Electron Backscatter Diffraction/Energy Dispersive X-ray Spectrometry(EBSD/EDS)techniques.A theoretical framework for analysis of elastic-plastic deformation of such3D microstructures is ***-induced shear band formation,void initiation,growth and linkage at large plastic strains during uniaxial tensile loading were investigated based on reconstructed 3D representative volume element(RVE)models with real-distribution of particles and the results compared with experimental ***-situ SEM interrupted tension tests along transverse direction(TD)and rolling direction(RD),employing microscopic-digital image correlation(μ-DIC)technique,were carried out to investigate slip bands,micro-voids formation and obtain microstructural strain *** resulting local strain maps were analyzed in relation to the experimentally observed plastic flow localization,failure modes and local stress maps from simulations of RVE *** influences of particle size,shape,orientation,volume fraction as well as matrix-particle interface properties on local plastic deformation,global stress-strain/strain-hardening curves and interfacial failure mechanisms were studied based on 3D RVE *** possible,the model results were compared with in-situ tensile test *** general,good agreement was observed,indicating that the real 3D microstructure-based RVE models can accurately predict the plastic deformation and interfacial failure evolution in AA7075-O aluminum sheet.

关键词： Representative volume element AA7075-O aluminum sheet In-situ SEM Microscopic-digital image correlation(μ-DIC) Elastoplastic behavior

Organorhenium(Ⅶ) oxides

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Rare Metals 2006年第Z1期25卷 411-421页

作者： KüHN Fritz E. jain Kavita R. Department für Chemie der Technischen Universitt München Lichtenbergstrasse 4 D-85747 Garching bei München Germany

Methyltrioxorhenium (MTO) and its derivatives were utilized as catalysts for a broad variety of organic reactions after the discovery of an easy synthetic access way to this class of compounds. Among the numerous characterization techniques, 17O-NMR spectroscopy and vibrational spectroscopy were exemplary discussed. The immobilization of MTO and its derivatives is of significant current interest as is the synthesis of chiral derivatives.

关键词： catalysis epoxidation immobilization olefination rhenium

HIOC:a hybrid imputation method to predict missing values in medical datasets

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International Journal of Intelligent Computing and Cybernetics 2021年第4期14卷 598-616页

作者： Pooja Rani Rajneesh Kumar Anurag jain MMEC Maharishi Markandeshwar(Deemed to be University)MullanaIndia and MMICT&BMMaharishi Markandeshwar(Deemed to be University)MullanaIndia CSE MMECMaharishi Markandeshwar(Deemed to be University)MullanaIndiaand Virtualization Department School of Computer ScienceUniversity of Petroleum and Energy StudiesDehradunIndia

Purpose-Decision support systems developed using machine learning classifiers have become a valuable tool in predicting various ***,the performance of these systems is adversely affected by the missing values in medical *** methods are used to predict these missing *** this paper,a new imputation method called hybrid imputation optimized by the classifier(HIOC)is proposed to predict missing values ***/methodology/approach-The proposed HIOC is developed by using a classifier to combine multivariate imputation by chained equations(MICE),K nearest neighbor(KNN),mean and mode imputation methods in an optimum *** of HIOC has been compared to MICE,KNN,and mean and mode *** classifiers support vector machine(SVM),naive Bayes(NB),random forest(RF)and decision tree(DT)have been used to evaluate the performance of imputation ***-The results show that HIOC performed efficiently even with a high rate of missing *** had reduced root mean square error(RMSE)up to 17.32%in the heart disease dataset and 34.73%in the breast cancer *** prediction of missing values improved the accuracy of the classifiers in predicting *** increased classification accuracy up to 18.61%in the heart disease dataset and 6.20%in the breast cancer ***/value-The proposed HIOC is a new hybrid imputation method that can efficiently predict missing values in any medical dataset.

关键词： Imputation methods Multivariate imputation by chained equations KNN imputation Mode imputation Mean imputation Hybrid imputation

Should we redefi ne large common bile duct stone?

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World Journal of Gastroenterology 2008年第4期14卷 651-652页

作者： Shyam Sunder Sharma Pankaj jain Department of Gastroenterology SMS Medical College and Hospital JaipurJaipur-302021India

The definition of large stones is not clear ranging from 10 mm to 15 mm and does not include the lower common bile duct (CBD) diameter. Three hundred and four patients who underwent endoscopic retrograde cholangiopancreatography and stone extraction were retrospectively analyzed over a 1-year period. Sixteen patients were different from others in that 10 patients with large stones had stone extraction with a wire basket or a balloon catheter and 6 patients with small stones had stone extraction with mechanical lithotripsy. The defi nition of large stones should include diameter of the lower CBD and any stone in lower CBD with its diameter greater than 2 mm.

关键词： Large common bile duct stone Definition

Optimized Tuning of LOADng Routing Protocol Parameters for IoT

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Computer Systems Science & Engineering 2023年第8期46卷 1549-1561页

作者： Divya Sharma Sanjay jain Vivek Maik Department of Electronics and Communication New Horizon College of EngineeringBengaluru560103India CMR Institute of Technology Bengaluru560037India Department of Electronics and Communication SRM Institute of Science and TechnologyKattankulathurChennai603203India

Interconnected devices and intelligent applications have slashed human intervention in the Internet of Things(IoT),making it possible to accomplish tasks with less human ***,it faces many problems,including lower capacity links,energy utilization,enhancement of resources and limited resources due to its openness,heterogeneity,limited resources and *** is challenging to route packets in such a constrained *** an IoT network constrained by limited resources,minimal routing control overhead is required without packet *** constrained environments can be improved through the optimal routing *** is challenging to route packets in such a constrained ***,this work is motivated to present an efficient routing protocol for enhancing the lifetime of the IoT *** On-demand Ad hoc Distance-vector Routing Protocol—Next Generation(LOADng)protocol is an extended version of the Ad Hoc On-Demand Distance Vector(AODV)*** AODV,LOADng is a lighter version that forbids the intermediate nodes on the route to send a route reply(RREP)for the route request(RREQ),which originated from the source.A resource-constrained IoT network demands minimal routing control overhead and faster packet ***,in this paper,the parameters of the LOADng routing protocol are optimized using the black widow optimization(BWO)algorithm to reduce the control overhead and ***,the performance of the proposed model is analyzed with the default LOADng in terms of delay,delivery ratio and *** results show that the LOADng-BWO protocol outperforms the conventional LOADng protocol.

关键词： Internet of things optimization algorithm routing protocol LOADng

Effect of Ipomea carnea Jacq. flowers on hematological changes in toluene diisocyanate-induced inflammation in Wistar rats

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Chinese Journal of Natural Medicines 2014年第3期12卷 161-166页

作者： jain Smita Patil U.K. Department of Pharmacognosy VNS Institute of Pharmacy Department of Pharmaceutical Sciences Dr. H.S. Gour Central University

AIM： To investigate the active chloroform fraction of the ethanol extract oflpomoea carnea flowers on hematological changes in toluene diisocyanate-induced inflammation in Wistar rats. METHOD： Except for the control group, all of the rats were sensitized with intranasal application of 5 μL of 10% toluene diiso- cyanate （TDI） for 7 days. One week after second sensitization, all of the rats were provoked with 5 ~tL of 5% TDI to induce airway hypersensitivity. After the last challenge, blood and bronchoalvelor lavage （BAL） fluid were collected and subjected to total and differential leucocytes count. Flash chromatography was performed on the most active chloroform fraction to isolate an individual component. RESULTS： Treatment with the ethanolic extract and its chloroform fraction at an oral dose of 200 mg·kg^ -1 showed a significant decrease in circulating neutrophil and eosinophil in blood and BAL as compared with standard dexamethasone （DEXA）. The structure of the compound obtained from chloroform fraction oflpomea carnea was elucidated as stigmast-5, 22-dien-3β-ol on the basis of spectral data analysis. CONCLUSION： The chloroform fraction was found to be more effective to suppress airway hyper reactivity symptoms, and de- creased count of both total and differential inflammatory cells.

关键词： Ipomea carnea Toluene diisocyanate Bronchoalvelor lavage Neutrophils Stigmasterol

THE EFFECT OF MAGNETIC FIELDS ON LOW FREQUENCY OSCILLATING NATURAL CONVECTION WITH PRESSURE GRADIENT

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Applied Mathematics and Mechanics(English Edition) 2003年第3期24卷 274-283页

作者： G.C.Sharma Madhu jain Mahesh Chandra School of Mathematical Sciences Institute of Basic ScienceSchool of Mathematical SciencesInstitute of Basic ScienceSchool of Mathematical SciencesInstitute of Basic Science KhandariAgra-282002IndiaKhandariAgra-282002IndiaKhandariAgra-282002India

The oscillating natural convection in the presence of transverse magnetic field with time depending pressure gradient is studied. The analysis of the problem is carried out by assuming that the fluid is flowing in a parallel plate configuration. The emphasis is on low frequency oscillating convective flows induced by g-jitter associated with micro gravity because of their importance to the space processing materials. A general solution for an oscillating flow in the presence of transverse magnetic field is carried out. Some special cases of the oscillating flow and its response to an applied magnetic field are performed. It was observed that the behavior of oscillating free convective flows depends on frequency, amplitude of the driving buoyancy forces, temperature gradient,magnetic field and the electric conditions of the channel walls. In the absence of magnetic field, buoyancy force plays a predominant role in driving the oscillatory flow pattern, and velocity magnitude is also affected by temperature gradients. To suppress the oscillating flow external magnetic field can be used. It is also found that the reduction of the velocity is inversely proportional to the square of the applied magnetic field with conducting wall but directly proportional to the inverse of the magnetic field with insulating wall. Detailed calculations and computational results are also carried out to depict the real situation.

关键词： convection g- jitter acceleration buoyancy force magnetic field pressure gradient

Effects of multiple subcavities with floor subcavity in supersonic cavity flow

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Propulsion and Power Research 2023年第1期12卷 114-137页

作者： Priyansh jain Anbarasan Sekar Aravind Vaidyanathan Indian Institute of Space Science and Technology ThiruvananthapuramKerala 695547India

Experimental and computational analysis has been carried out by many researchers on supersonic cavity flow,but detailed analysis based on Rossiter’s model still requires some *** the current study an open rectangular cavity with a length to depth ratio of 2(L/D=2)and Mach number at the inlet as 1.71,was considered as a baseline configuration for experimental *** techniques such as power spectral density(PSD),correlation,and overall sound pressure level(OASPL)were carried out on the unsteady pressure data,to analyze the aero-acoustic flow ***-speed schlieren images were processed to obtain spatially coherent modes by proper orthogonal decomposition(POD).The analysis was extended for different dimensions of subcavities on the aft,floor,and front *** detailed analysis of these configurations with different dimensions and combinations revealed the various flow features and mode frequencies in supersonic *** the front wall subcavity act as a passive control device,reducing the overall sound pressure level inside the cavity whereas,the aft wall subcavity acts as a passive resonator with distinct harmonic fluidresonant modes,a similar phenomenon was observed for floor subcavity at different locations.A novel method was employed to analyze Rossiter’s model and its applicability in estimating experimental modes was verified,as it accurately predicted the dominant frequencies with a maximum of 2.74% uncertainty among all the configurations.

关键词： Supersonic cavity flow Fast Fourier transform High speed schlieren Proper orthogonal decomposition Rossiter’s feedback mechanism

Fuzzy System Design Using Current Amplifier for 20 nm CMOS Technology

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Computers, Materials & Continua 2022年第7期72卷 1815-1829页

作者： Shruti jain Cherry Bhargava Vijayakumar Varadarajan Ketan Kotecha Jaypee University of Information Technology Waknaghat172234India Symbiosis Institute of Technology Symbiosis International(Deemed University)Pune411021India School of Computer Science and Engineering The University of New South WalesSydneyNSW 2052Australia Symbiosis Centre for Applied Artificial Intelligence Symbiosis International(Deemed University)Pune411021India

In the recent decade,different researchers have performed hardware implementation for different applications covering various areas of *** this research paper,a novel analog design and implementation of different steps of fuzzy systems with current differencing buffered amplifier(CDBA)are proposed with a compact structure that can be used in many signal processing *** proposed circuits are capable of wide input current range,simple structure,and are highly *** electrical parameters were compared for the proposed fuzzy system when using different membership *** novelty of this paper lies in the electronic implementation of different steps for realizing a fuzzy system using current *** the power supply voltage of CDBA is 2V,it results in 155mW,power dissipation;4.615KΩ,input resistance;366KΩ,output resistances;and 189.09 dB,common-mode rejection ratio.A 155.519 dB,voltage gain,and 0.76V/μs,the slew rate is analyzed when the power supply voltage of CDBAis *** fuzzy system is realized in 20nm CMOS technology and investigated with an output signal of high precision and high speed,illustrating that it is suitable for realtime *** this research paper,a consequence of feedback resistance on the adder circuit and the defuzzified circuit is also analyzed and the best results are obtained using 100K *** structure has a low hardware complexity leading to a low delay and a rather high quality.

关键词： Current amplifiers membership functions fuzzy system fuzzy operators defuzzified circuit feedback resistance