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了解阅片者差异性：一项25名放射科医师检测CT肝转移灶的研究

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国际医学放射学杂志 2023年第2期 236-236页

作者： s.s.Hsieh D.A.Cook A.Inoue H.Gong p.s.pillai M.p.Johnson 惠情情

摘要在CT成像的常见任务中，例如对肝转移灶的检测在阅片者间存在相当大的差异性。这种差异性可能会导致误诊并影响治疗。目的在腹部增强CT影像上，确定与（a）阅片

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Unlocking hypoglycemia–associated brain microvascular dysfunction:critical insights from proteomic analysis

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Neural Regeneration Research 2025年第6期20卷 1707-1708页

作者： siva s.V.p.sakamuri Anil sakamuri Department of Chemistry Auburn University at MontgomeryMontgomeryALUSA Vascular Biology Center and Department of Medicine Medical College of Georgia at Augusta UniversityAugustaGAUSA

Hypoglycemia-a critical complication linked to worsened brain function in diabetic subjects:Hypoglycemia is characterized by a decline in circulatory glucose levels below sta nda rd physiological *** hypoglycemia,classified as level 1 hypoglycemia,is defined by blood glucose levels below 70 mg/dL and can be effectively addressed through carbohydrate *** hypoglycemia,denoted by blood glucose levels less than 54 mg/dL,poses a life-threatening risk if left *** with type 1 and type 2 diabetes undergoing insulin treatment are particularly susceptible to hypoglycemia due to impaired counterregulatory mechanisms.

关键词： impaired intake critical

Aerodynamic characteristics of unsymmetrical aerofoil at various turbulence intensities

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Chinese Journal of Aeronautics 2019年第11期32卷 2395-2407页

作者： s.ARUNVINTHAN s.NADARAJA pillai Turbulence & Flow Control Lab School of Mechanical Engineering SASTRA Deemed University

A series of wind tunnel tests were performed to investigate the effect of turbulent inflows on the aerodynamic characteristics of the unsymmetrical airfoil at various turbulence intensities and Reynolds number. To assess the aerodynamic characteristics, surface pressure measurements were made over the unsymmetrical airfoil surface by using a simultaneous pressure scanner Mps4264 of scanivalve make. self-generated passive grids made of parallel arrays of round bars were placed at four different locations to generate various Turbulence Intensities(TI) in the wind tunnel. The location of the passive grid has been normalized in terms of considering the distance between the entry of the test section and the leading edge of the model. Based on the wind tunnel results, by comparing the baseline without grid low turbulence case TI = 0.51% with other turbulence generated cases like TI = 4.68%, 4.73%, 6.04% and 8.46% at different Reynolds number, it is found that the coefficient of lift increases with the increase in the turbulence intensity. Results also reveal that the flow featuring turbulence can effectively delay the stall characteristics of an airfoil by attaching the flow over the airfoil for an extended region. Additionally, attempts were made to understand the influence of turbulence on the aerodynamic hysteresis.

关键词： Aerodynamic efficiency Aerodynamic hysteresis passive grid simultaneous pressure distribution Turbulence intensity

Collapse of charge ordering in Bi_(0.5)sr_(0.5)MnO_3 by cation disorder: a magnetic and structural investigation

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Journal of Rare Earths 2008年第2期26卷 237-240页

作者： s. savitha pillai Rajasekhar Madugundo santhosh. p. Nagappan Nair Low Temperature physics Laboratory Department of Physics Indian Institute of Technology Madras Chennai -600036 Defence Metallurgical Research Labora- tory

The structure, transport, and magnetic properties of ***0.5MnO3 （LBsMO）（x=0.1 and 0.4） were studied through X-ray diffraction, magnetization, and electron spin resonance （EsR） measurements. The structural analysis showed that the LBsMO crystallized in an orthorhombic perovskite structure with pbnm space group for x=-0.1 and Imma space group for x=0.4 and the highly polarizable 6s^2 lone pair of Bi^3＋ was the ttming factor for the structural variations. Magnetic studies revealed that the replacement of Bi ions by La ions resulted in the collapse high temperature charge ordering state of BsMO and it order Ferro Magnetically （FM） with Tc around 355 and 330 K for x=0.1 and 0.4, respectively. Both EsR, temperature and field dependant magnetization suggested that there was a coexistence of FM and the paramagnetic phases well below Tc and the FM and CO-AFM phases below 250 K of LBsMO.

关键词： charge ordering (CO) colossal magneto resistance (CMR) rare earths

Effect of surface blowing on aerodynamic characteristics of tubercled straight wing

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Chinese Journal of Aeronautics 2019年第5期32卷 1111-1120页

作者： N.GANEsH s.ARUNVINTHAN s.NADARAJA pillai Turbulence and Flow Control Lab School of Mechanical Engineering SASTRA Deemed University

Recent research proves that wings with leading-edge tubercles have the ability to perform efficiently in post-stall region over the conventional straight wing. Moreover, the conventional straight wing outperforms the tubercled wing at a pre-stall region which is quintessential. Even though tubercled wing offers great performance enhancement, because of the complexity of the flow, the trough region of the tubercled wing is more prone to flow separation. Henceforth, the present paper aims at surface blowing – an active flow control technique over the tubercled wing to enhance the aerodynamic efficiency by positively influencing its lift characteristics without causing any additional drag penalty. Flow parameters like blowing velocity ratios and the location of blowing were chosen to find the optimised configuration keeping the amplitude and frequency of the leading-edge tubercles constant as 0.12 c and 0.25 c respectively. Numerical investigations were carried out over the baseline tubercled wing and tubercled wing with surface blowing at various blowing jet velocity ratios 0.5, 1 and 2 over four different chordwise locations ranging from 0.3 c to 0.8 *** results confirm that blowing at various x/c with different blowing velocity ratios performs better than the conventional tubercled wing. Comparatively, blowing velocity ratio 2 at 0.3 c shows peak performance of about 28% enhancement in the lift characteristics relative to the baseline model. particularly, in the pre-stall region, 25–50% increase in aerodynamic efficiency is evident over the tubercled wing with surface blowing compared with the baseline case. Additionally,attempts were made to delineate the physical significance of the flow separation mechanism due to blowing by visualizing the streamline pattern.

关键词： Active flow control Aerodynamic efficiency Biomimetics Blowing Tubercles

Detection of Fuel Adulteration Using Wave Optical with Machine Learning Algorithms

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Computer systems science & Engineering 2022年第4期41卷 19-33页

作者： s.Dilip Kumar T.V.sivasubramonia pillai Department of Instrumentation and Control Engineering Sri Krishna College of TechnologyCoimbatore641105TamilnaduIndia Department of physics University College of EngineeringNagercoil629004TamilnaduIndia

Fuel is a very important factor and has considerable inﬂuence on the air quality in the environment,which is the heart of the *** increase of vehi-cles in lived-in areas results in greater emission of carbon particles in the *** fuel causes more contaminated particles to mix with breathing air and becomes the main source of dangerous *** is the mixing of foreign substances in fuel,which damages vehicles and causes more health problems in living beings such as humans,birds,aquatic life,and even water resources by emitting high levels of hydrocarbons,nitrogen oxides,and carbon *** frequent blending liquids are lubricants and kerosene in the petrol,and its adulteration is a considerable problem that adds to environ-mental *** study focuses on detecting the adulteration in petrol using sensors and machine learning algorithms.A modiﬁed evanescent wave opticalﬁber sensor with discrete wavelet transform is proposed for classiﬁcation of adult-erated data from the ***,support vector machine classiﬁer is used for accurate *** sensor isﬁrst tested with fuel and numerical data is classiﬁed based on machine learning ***,the result is eval-uated with less error and high accuracy of 99.9%,which is higher than all existing techniques.

关键词： petrol adulteration discrete wavelet transform modiﬁed evanescent wave opticalﬁber sVM classiﬁer

New preamble sequence for WiMAX system with Improved synchronization Accuracy

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Intelligent Automation & soft Computing 2023年第3期35卷 3187-3197页

作者： suma sekhar sakuntala s.pillai s.santhosh Kumar Department of Electronics and Communication Engineering LBS Institute of Technology for WomenThiruvananthapuramKeralaIndia Mar Baselios College of Engineering and Technology ThiruvananthapuramKeralaIndia Department of Electronics and Communication Govt.Engineering CollegeIdukkiKeralaIndia

Worldwide Interoperability for Microwave Access(WiMAX)trusts Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing(MIMO-OFDM)combination for the deployment of physical layer functions and for connecting the medium access control to the wireless *** though Orthogonal Frequency Division Multiplexing(OFDM)facilitates reliable digital broadband transmission in the fading wireless channels,the presence of synchro-nization errors in the form of Carrier Frequency Offset(CFO)and Time Offset(TO)adversely affect the performance of OFDM based physical *** objective of this work is to improve the accuracy of the frequency and the time offset estimation in the WiMAX physical layer.A method to enhance the synchro-nization accuracy byﬁne-tuning the merit factor of the preamble sequence is sug-gested in this ***,a new preamble with improved synchronization accuracy is proposed for the WiMAX *** performance of the proposed preamble is evaluated in a Rayleigh fading channel and the results of simulations show that the Mean square Error(MsE)in offset estimation is signiﬁcantly reduced and it outperforms the standard WiMAX preamble.

关键词： WiMAX MIMO OFDM time offset carrier frequency offset preamble sequence integrated sidelobe level merit factor

physical,Mechanical,and Tribological Attributes of stir-Cast AZ91/siC_p Composite

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Acta Metallurgica sinica(English Letters) 2014年第2期27卷 295-305页

作者： K.K.Ajith Kumar Abhilash Viswanath T.p.D.Rajan U.T.s.pillai B.C.pai Material science and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology

In the present investigation, composites with silicon carbide particle （siCp） as reinforcement and AZ91 magnesium alloy as matrix have been synthesized using liquid metal stir-casting technique with optimized processing conditions. The composites with good particle distribution in the matrix, and better grain refinement and good interfacial bonding between the matrix and reinforcement have been obtained. The effect of siCp content on the physical, mechanical, and tribological properties of Mg-based metal matrix composite （MMC） is studied with respect to particle distribution, grain refinement, and particle/matrix interfacial reactions. The electrical conductivity, coefficient of thermal expansion, microas well as macro-hardness, tensile and compressive properties, and the fracture behavior of the composites along with dry sliding wear of the composites have been evaluated and compared with the base alloy.

关键词： Composite AZ91D alloy Casting alloy Mechanical properties Wear

seed Extract of psidium guajava as Ecofriendly Corrosion Inhibitor for Carbon steel in Hydrochloric Acid Medium

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Journal of Materials science & Technology 2011年第12期27卷 1143-1149页

作者： K.p.Vinod Kumar M. sankara Narayana pillai G. Rexin Thusnavis Department of Chemistry University College of Engineering Nagercoil Anna University of TechnologyTirunelveli Nagercoil-629004 Tamil Nadu India Department of Chemistry Noorul Islam UniversityKumaracoil Nagercoil Tamilnadu India Department of Chemistry St. Xavier s Catholic College of EngineeringChunkankadai Nagercoil-629003 Tamil Nadu India

The anticorrosion characteristics of the seeds of psidium guajava （p. guajava） fruits on carbon steel in acid medium were examined with weight loss data and subsequently thermodynamic factors such as heat of ad- sorption of the inhibitor on the metal surface （Q）, change in entropy （Δs）, change in flee energy of the reaction （ΔG）, corrosion rate （CR） and energy of activation for corrosion reaction of carbon steel （E） were also evaluated. Adsorption isotherm was plotted to study the adsorption of the inhibitor on the metal surface with increasing concentration of the inhibitor. The functional groups responsible for inhibition were investi- gated using Fourier transform infrared （FT-IR） spectra. Electrochemical parameters were evaluated through the potentiodynamic Tafel polarization and impedance spectral studies. scanning electron microscopy （sEM） micrographs were recorded to investigate the change in surface morphology. The complete study reveals the efficiency of seed extract of p. guajava as a safe, ecofriendly and alternate corrosion inhibitor for carbon steel in acid medium.

关键词： psidium guajava (p. guajava) steel Corrosion polarization Impedance Ecofriendly