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FEM based Electromagnetic Signature Analysis of Winding Inter-turn Short-Circuit Fault in Inverter fed Induction Motor

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CES transactions on Electrical Machines and Systems 2019年第3期3卷 309-315页

作者： Praveen Kumar N isha t b Department of Electrical and Electronics Engineering Amrita School of EngineeringCoimbatoreAmrita Vishwa VidyapeethamIndia

the intent of this paper is to analyze the electromagnetic signature of stator winding inter-turn short-circuit fault in a closed loop speed controlled Induction Motor(IM)employing Finite Element *** winding short-circuit nearly covers 21%of faults in *** the inter-turn fault at an incipient stage is one of the challenging task in the area of fault detection of IM to prevent crucial damages in industrial *** detecting the faults in inverter fed IM under variable speed applications under varying load is one of the major issues in industrial *** the signatures of electromagnetic field contains the entire data in association with the location of rotor,stator and mechanical parts of the motor,a regular monitoring of fields in the airgap can be used to diagnose the inter-turn fault in the stator winding of *** this direction,an IM is modeled with several inter-turn fault severities like 30 turns,15 turns,5 turns&1 turn short using ANSYS Maxwell FEA tool and coupled with ANSYS Simplorer for loading *** PWM inverter with closed loop speed controlled strategy is implemented in Matlab Simulink and co-simulated with ANSYS Simplorer to integrate all the components in one common simulation platform environment for accurate design&analysis for realistic *** electromagnetic variables like flux density,flux lines and airgap flux density distribution over the machine are *** spatial FFt spectrum of radial component of flux density in the airgap contains the information related to the diagnosis of inter-turn fault at the incipient stage.

关键词： Electromagnetic fields finite element analysis inter-turn fault PWM inverter radial flux density.

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the impact of alpha-fetoprotein (AFP), child-turcotte-pugh (CtP) score and disease staging on the survival of hepatocellular carcinoma (HCC) patients: a retrospective cohort from single oncology center

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Oncology research 2025年第1期33卷 149-160页

作者： Nasser Mulla Yousef Katib Asim M Almughamsi Duaa S Alkhayat Mohamed Mosaad Samir t Alfotih Rawan Alaofi Department of Internal Medicine Faculty of Medicine Taibah University Madinah 42278 Saudi Arabia. Department of Radiology Faculty of Medicine Taibah University Madinah 42278 Saudi Arabia. Department of Surgery Faculty of Medicine Taibah University Madinah 42278 Saudi Arabia. Department of Endemic and Infectious Diseases Suez Canal University Ismailia 41522 Egypt. King Salman bin Abdulaziz Medical City Madinah 42311 Saudi Arabia. Prince Mohammed bin Abdulaziz Hospital Madinah 41511 Saudi Arabia.

background:Hepatocellular carcinoma (HCC) is the most common cause of cancer-related death in Saudi Arabia. Our study aimed to investigate the patterns of HCC and the effect of tNM staging, Alfa-fetoprotein (AFP), and Child-turcotte Pugh (CtP) on patients' overall survival (OS).Methods:A retrospective analysis was conducted on 43 HCC patients at a single oncology center in Saudi Arabia from 2015 to 2020. All patients had to fulfill one of the following criteria: (a) a liver lesion reported as definitive HCC on dynamic imaging and/or (b) a biopsy-confirmed diagnosis.Results:the mean patient age of all HCC cases was 66.8 with a male-to-female ratio of 3.3:1. All patients were stratified into two groups: viral HCC (n = 22, 51%) and non-viral HCC (n = 21, 49%). Among viral-HCC patients, 55% were due to HbV and 45% due to HCV. Cirrhosis was diagnosed in 79% of cases. Age and sex did not significantly statistically differ in OS among viral and non-viral HCC patients (-value > 0.05). About 65% of patients had tumor size >5 cm during the diagnosis, with a significant statistical difference in OS (-value = 0.027). AFP was >400 ng/ml in 45% of the patients. there was a statistically significant difference in the OS in terms of AFP levels (-value = 0.021). A statistically significant difference was also observed between the CtP score and OS (-value = 0.02). CtP class b had the longest survival. bSC was the most common treatment provided to HCC patients followed by sorafenib therapy. there was a significant statistical difference in OS among viral and non-viral HCC patients (-value = 0.008).Conclusions:the most common predictors for OS were the underlying cause of HCC, AFP, and tumor size. being having non-viral etiology, a tumor size >5 cm, an AFP > 400 ng/mL, and a CtP score class C were all negatively associated with OS.

关键词： Alpha-fetoprotein (AFP) Child-turcotte-pugh Hepatocellular carcinoma Pattern Progression free survival

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Measuring vacuum polarization with high-power lasers

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High Power Laser Science and Engineering 2016年第1期4卷 29-40页

作者： b.King t.Heinzl Centre for Mathematical Sciences Plymouth University

When exposed to intense electromagnetic fields, the quantum vacuum is expected to exhibit properties of a polarizable medium akin to a weakly nonlinear dielectric material. Various schemes have been proposed to measure such vacuum polarization effects using a combination of high- power lasers. Motivated by several planned experiments, we provide an overview of experimental signatures that have been suggested to confirm this prediction of quantum electrodynamics of real photon–photon scattering.

关键词： Heisenberg–Euler photon–photon scattering vacuum birefringence vacuum polarization

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A new adaptive bending method using closed loop feedback control

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transactions of Nonferrous Metals Society of China 2010年第11期20卷 2111-2117页

作者： t.WELO b.GRANLY Department of Engineering Design and Materials Norwegian University of Science and Technology(NTNU)

As the competition from companies in low cost countries increases,the need for more automated production which reduces labour cost while improving product quality is required.A new rotary compression bending set-up with automated closed-loop feedback control is thus being *** transferring in-process measurement data into an algorithm for predicting springback and bend angle prior to the unloading sequence,the dimensional accuracy is *** work focuses on the development of this steering *** the method used does not increase cycle time,it is attractive for high-volume industrial *** than 150 bending tests of AA6060 extrusions were conducted to determine the capability of the *** results show that by activating the automated closed-loop feedback system,the dimensional accuracy of the bent parts is more than three times better than that obtained by traditional compression *** the steering model permits the direct use of additional process data,such as instant wall thickness and cross sectional distortions,it is believed that extension of the measurement capabilities would improve the accuracy of the methodology even further.

关键词： adaptive bending closed-loop feedback dimensional accuracy springback aluminium extrusion

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CompactChain:an efficient stateless chain for UtXO-model blockchain

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Frontiers of Computer Science 2024年第2期18卷 167-179页

作者： b Swaroopa REDDY t Uday Kiran REDDY Department of Electrical Engineering Indian Institute of Technology HyderabadHyderabadTelangana 502285India

In this work,we propose a stateless blockchain called CompactChain,which compacts the entire state of the UtXO(Unspent transaction Output)based blockchain systems into two RSA *** first accumulator is called transaction Output(tXO)commitment which represents the tXO *** second one is called Spent transaction Output(StXO)commitment which represents the StXO *** this work,we discuss three algorithms:(i)to update the tXO and StXO commitments by the *** miner also provides the proofs for the correctness of the updated commitments;(ii)to prove the transaction’s validity by providing a membership witness in tXO commitment and non-membership witness against StXO commitment for a coin being spent by a user;(iii)to update the witness for the coin that is not yet spent;the experimental results evaluate the performance of the CompactChain in terms of time taken by a miner to update the commitments and time taken by a validator to verify the commitments and validate the *** compare the performance of CompactChain with the existing state-of-the-art works on stateless *** shows a reduction in commitments update complexity and transaction witness size which inturn reduces the mempool size and propagation latency without compromising the system throughput(transactions per second(tPS)).

关键词： stateless blockchain RSA Accumulator StXO commitment tXO commitment UtXO Non-interactive Proof of Exponentiation(NI-PoE) transactions per second(tPS)

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Exact solutions to drift-flux multiphase flow models through Lie group symmetry analysis

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Applied Mathematics and Mechanics(English Edition) 2015年第8期36卷 1105-1112页

作者： b.bIRA t.R.SEKHAR Department of Mathematics National Institute of Science and Technology Department of Mathematics Indian Institute of Technology Kharagpur

In the present paper, Lie group symmetry method is used to obtain some exact solutions for a hyperbolic system of partial differential equations （PDEs）, which governs an isothermal no-slip drift-flux model for multiphase flow problem. those sym- metries are used for the governing system of equations to obtain infinitesimal transforma- tions, which consequently reduces the governing system of PDEs to a system of ODEs. Further, the solutions of the system of ODEs which in turn produces some exact solutions for the PDEs are presented. Finally, the evolutionary behavior of weak discontinuity is discussed.

关键词： multiphase flow drift-flux models Lie group analysis exact solution weakdiscontinuity

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A note on general solution of Stokes equations

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Acta Mechanica Sinica 2016年第6期32卷 1044-1045页

作者： b.Sri Padmavati t.Amaranath School of Mathematics & Statistics University of Hyderabad

Li et al. (2015) claim that it is sufficient to use two harmonic functions to express the general solution of Stokes equations. In this paper, we demonstrate that this is not true in a general case and that we in fact need three scalar harmonic functions to represent the general solution of Stokes equations (Venkatalaxmi et al., 2004).

关键词： Stokes equations General solution Harmonic functions

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Reaction of diaminoglyoxime and cyclic azine compounds in high temperature and pressure water

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Chinese Science bulletin 1998年第16期43卷 1395-1399页

作者： t.b.brill Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Department of Chemistry and biochemistry University of Delaware Newark USA

Diaminoglyoxime was reacted in water at 150-400℃ and at 27.5 MPa pressure in metal ti tubing reactor. Experimental results indicate that, diaminoglyoxime can be converted into NH-3 and CO-2, either through direct hydrolysis or through pyrolysis and polymerization, and then further hydrolysis. the possible reaction mechanism is nucleophilic addition of water.

关键词： diaminoglyoxime cyclic azine compound supercritical water pyrolysis hydrolysis organic wastes.

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Heat transfer analysis of MHD and electroosmotic flow of non-Newtonian fluid in a rotating microfluidic channel:an exact solution

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Applied Mathematics and Mechanics(English Edition) 2021年第7期42卷 1047-1062页

作者： t.SIVA S.JANGILI b.KUMbHAKAR Department of Mathematics National Institute of Technology MeghalayaShillong 793003India Department of Mathematics National Institute of Technology WarangalTelangana 506004India

the heat transfer of the combined magnetohydrodynamic(MHD)and electroosmotic flow(EOF)of non-Newtonian fluid in a rotating microchannel is analyzed.A couple stress fluid model is scrutinized to simulate the rheological characteristics of the *** exact solution for the energy transport equation is ***,this solution is utilized to obtain the flow velocity and volume flow rates within the flow domain under appropriate boundary *** obtained analytical solution results are compared with the previous data in the literature,and good agreement is obtained.A detailed parametric study of the effects of several factors,e.g.,the rotational Reynolds number,the Joule heating parameter,the couple stress parameter,the Hartmann number,and the buoyancy parameter,on the flow velocities and temperature is *** is unveiled that the elevation in a couple stress parameter enhances the EOF velocity in the axial direction.

关键词： microfluidic electric double layer(EDL) electroosmotic flow(EOF) magnetohydrodynamic(MHD) couple stress fluid

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Inclusive Cross Section Production of J/ψ in LEP

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Communications in theoretical Physics 2017年第2期67卷 212-216页

作者： t.Osati b.Abubakri Department of Physics Razi University Kermanshah Iran

Cross section production is one of the observable quantities in the hadronic systems. Inclusive cross section production J/ψ may be calculated through the use of the fragmentation c → J/ψ. In this paper we calculate the inclusive cross section production J/ψ about the pole of Z^0 in the e^+e^- annihilation, through the lowest order regim of perturbative of QCD ananlyticaly. the obtained results arrive an excellent agreement with the exprimental data to produce the inclusive cross section production c → J/ψ.

关键词： inclusive cross section fragmentation

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