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Journal of Advanced Dielectrics 2012年第2期2卷 74-84页

作者： SEIJI KOJIMA MUHTAR AHART venkatasubramanian sivasubramanian ALEXEI.A.BOKOV ZUO-GUANG.YE PAS University of Tsukuba TsukubaIbaraki 305-8573Japan Geophysical Laboratory Carnegie Institution of Washington Washington DC 20015 USA Indira Gandhi Centre for Atomic Research Kalpakkam-603102 India Department of Chemistry and 4D LABS Simon Fraser University Burnaby BCCanada V5A 1S6

This paper reviews the recent progress in the understanding of the dynamics of Pb(B_(1/2)B0_(1/2))O_(3)-type relaxor ferroelectrics using of broadband micro-Brillouin scattering spectroscopy,which covers a large frequency range from 1 to 1000 GHz by a tandem multi-pass FabryPerot inter*** contrast to Pb(B_(1/3)B0_(2/3))O_(3)-type relaxors,there is no frustration on the B-site of perovskite structure and the degree of order of B-site cations depends on heat *** softening of sound velocity and an intense central peak are observed above the Curie temperature TC owing to the polarization°uctuations in polar nanoregions(PNRs).Unlike the Pb(B_(1/3)B0_(2/3))O_(3)relaxors,Pb(B_(1/2)B'_(1/2))O_(3)does not undergoes a typical diffuse phase transition without lead vacancies on A-site which enhances *** the(1-x)Pb(B_(1/2)B'_(1/2))O_(3-x)PbTiO_(3)solid solutions,the long range polar order increases as the PbTiO_(3)content ***,a central peak owing to dynamic PNRs still remains even for the composition near the MPB,and a critical slowing down is clearly observed in the vicinity of TC.

关键词： Ferroelectric relaxor elastic anomaly central peak Brillouin scattering

Graphene oxide/hydrotalcite modified polyethersulfone nanohybrid membrane for the treatment of lead ion from battery industrial effluent

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中国化学工程学报:英文版 2023年第8期60卷 253-261页

作者： Sinu Poolachira sivasubramanian Velmurugan Department of Chemical Engineering National Institute of Technology CalicutCalicut 673601India

In the present study, polyethersulfone based nanohybrid membranes were effectively fabricated by incorporating graphene oxide(GO) and hydrotalcite(HT) nanosheets into the membrane structure. HT was prepared to overcome the irreversible agglomeration behavior of GO at a high concentration which affects the performance of the membranes. In particular, the shedding of HT in formamide provides a two-dimensional nanosheet with a higher positive charge density to prevent the restacking of GO nanosheets. Here, exfoliated GO and HT with different combinations(1:1, 1:2 and 1:3) were infused in the membrane matrix to treat lead-acid battery effluent effectively. Finally, the hybrid membranes were characterized for hydrophilicity, mechanical strength and pure water flux. In combination with the superior properties of GO and HT, the prepared hybrid membranes can be used as effectively to improve the separation and permeation performance. The phase inversion process eliminated the leaching of nanoparticles from the membrane matrix. The reusability of the hybrid membrane was achieved using0.1 mol·L^(-1)NaOH solution and reused without significant reduction in lead removal efficiency. The cost analysis of the membrane was also estimated from the lab study. Therefore, the present study suggested the selective and sustainable treatment of lead from a real-life effluent.

关键词： Nanohybrid membrane Polyethersulfone Graphene oxide Hydrotalcite Lead battery effluent Reusability Cost analysis

DTFab:A Digital Twin based Approach for Optimal Reticle Management in Semiconductor Photolithography

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Journal of Systems Science and Systems Engineering 2023年第3期32卷 320-351页

作者： Chandrasekhar Komaralingam sivasubramanian Robert Dodge Aditya Ramani David Bayba Mani Janakiram Eric Butcher Joseph Gonzales Giulia Pedrielli School of Computing and Augmented Inteligence Arizona State UniversityTempeAZUSA Intel Corporation ChandlerAZUSA

Photolithography is among the key phases in chip *** is also among the most expensive with manufacturing equipment valued at the hundreds of millions of *** is paramount that the process is ran efficiently,guaranteeing high resource utilization and low product cycle times.A key element in the operation of a photolithography system is the effective management of the reticles that are responsible for the imprinting of the circuit path on the *** reticles means determining which are appropriate to mount on the very expensive scanners as a function of the product types being released to the *** the importance of the problem,several heuristic policies have been developed in the industry practice in an attempt to guarantee that the expensive tools are never ***,such policies have difficulties reacting to unforeseen events(e.g.,unplanned failures,unavailability of reticles).On the other hand,the technological advance of the semiconductor industry in sensing at system and process level should be harnessed to improve on these"expert policies".In this manuscript,we develop a system for the real time reticle management that not only is able to retrieve information from the real system,but also is able to embed commonly used policies to improve upon *** develop a new digital twin for the photolithography process that efficiently and accurately predicts the system performance,thus allowing our system to make predictions for future behaviors as a function of possible *** results demonstrate the validity of the developed model,and the feasibility of the overall approach demonstrating a statistically significant improvement of performance as compared to the current policy.

关键词： Semiconductor manufacturing reinforcement learning reticle management digital twin

Effect of Process Parameters on Tensile Strength of Friction Stir Welded Cast LM6 Aluminium Alloy Joints

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Journal of Materials Science & Technology 2009年第5期25卷 655-664页

作者： M.Jayaraman R.sivasubramanian V.Balasubramanian Department of Mechatronics Engineering Kongu Engineering CollegeErodeTamil NaduIndia Department of Mechanical Engineering Coimbatore Institute of TechnologyCoimbatoreTamil NaduIndia Centre for Materials Joining&Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalainagarTamil NaduIndia

This paper reports the effect of friction stir welding （FSW） process parameters on tensile strength of cast LM6 aluminium alloy. Joints were made by using different combinations of tool rotation speed, welding speed and axial force each at four levels. The quality of weld zone was investigated using macrostructure and microstructure analysis. Tensile strength of the joints were evaluated and correlated with the weld zone hardness and microstructure. The joint fabricated using a rotational speed of 900 r/min, a welding speed of 75 mm/min and an axial force of 3 kN showed superior tensile strength compared with other joints. The tensile strength and microhardness of the welded joints for the optimum conditions were 166 MPa and 64.8 Hv respectively.

关键词： LM6 aluminium alloy Friction stir welding Tool rotation speed Welding speed Axial force Tensile strength

Preliminary studies for a new antibiotic from the marine mollusk Melo melo(Lightfoot,1786)

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Asian Pacific Journal of Tropical Medicine 2011年第4期4卷 310-314页

作者： Kanagasabapathy sivasubramanian Samuthirapandian Ravichandran Kumaresan M Centre of Advanced Study in Marine Biology Annamalai University

Objective:To search for new bioactive compounds from marine mollusks Melo melo(***). Methods:Preliminary work for bioactive compound was identified by using disc diffusion methods against human *** analyses of compound were done by using TLC, *** also estimate the amount of protein in the samples by following Biuret ***:In antibacterial activity the maximum diameter of 24 mm zone of inhibition was recorded against Klebsiella pneumoniae(***) strain of the mucus extract and minimum zone of inhibition of 11 mm was observed in Salmonella typhi(***) strain of body tissue *** antifungal activity of the extraction shows maximum activity against Trichophyton mentagarophytes(***)(14 mm) and minimum activity was recorded in Aspergillus flavus(***)(11 mm).The extract of mucus,nerve tissue,body tissue and kidney that showed antimicrobial activity was subjected to TLC to determine the presence of the peptides and amide groups,and also subjected to SDS-PACE to estimate the molecular weight of proteins in a clear band were detected in the gel that represented kidney,body tissue,brain and mucus represent 14,17,22,45 ***:The extracts from marine mollusks *** is the potential source of producing bioactive compounds against human pathogens and can be used for synthesis of new drugs.

关键词： Antibacterial Antifungal TLC SDS-PAGE Melo melo

System Identification of Heritage Structures Through AVT and OMA:A Review

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Structural Durability & Health Monitoring 2019年第1期13卷 1-40页

作者： Vinay Shimpi Madappa V.R.sivasubramanian S.B.Singh Department of Civil Engineering National Institute of Technology PuducherryKaraikal609609India Department of Civil Engineering Birla Institute of Technology and Science PilaniPilani333031India

In this review article,the past investigations carried out on heritage structures using Ambient Vibration Test(AVT)and Operational Modal Analysis(OMA)for system identification(determination of dynamic properties like frequency,mode shape and damping ratios)and associated applications are summarized.A total of 68 major research studies on heritage structures around the world that are available in literature are surveyed for this *** first,field investigations carried out on heritage structures prior to conducting AVT are explained in ***,specifications of accelerometers,location of accelerometers and optimization of accelerometer networks have been elaborated with respect to the geometry of the heritage *** addition to this,ambient vibration loads and data acquisition procedures are also ***,the state of art of performing OMA techniques for heritage structures is explained ***,various applications of system identification for heritage structures are ***,conclusions are made towards errorless system identification of heritage structures through AVT and OMA.

关键词： Ambient Vibration Test(AVT) heritage structures Operational Modal Analysis(OMA) structural assessment system identification

An analysis of land use development city using imagery pattern in the industrial high resolution satellite

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Journal of Geographical Sciences 2011年第1期21卷 79-88页

作者： John Prince Soundranayagam P. sivasubramanian N. Chandrasekar K.S.P. Durairaj Centre for GeoTechnology Manonmaniam Sundaranar University Tirunelveli-627012 India Department of Geology V.O.Chidambaram College Tuticorin-628008 India The controller Manonmaniam Sundaranar University Tirunelveli-627012 India

The spatial differentiation of land use changes of Tuticorin is studied using high resolution LISS III satellite imagery and Maximum Likelihood algorithms. The classification accuracy of 95.2% was obtained. In this study,the land use of Tuticorin is classified as settlement,salt pan,agricultural land,wasteland,water bodies and shrubs. The settlement area is increased to 4.6 km2 during the year 2001 and 2006. The settlement area change is mainly driven by growth of industries and migration of people from peripheral villages. Shrub is increased to 3.63 km2 in the six year period. Water logging due to growth of shrubs in Tuticorin leads to several environmental and health hazard. This study warrants proper urban planning for Tuticorin for sustainable use of resource and environment.

关键词： land use urban planning remote sensing environment health hazard

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机器学习:行业挑战的应对之道

软件和集成电路 2022年第11期 2-3页

作者： Swami sivasubramanian 亚马逊云科技

机器学习(ML)是当今世界极具变革性的技术之一。无论是在增强客户体验、提高员工生产力、削减成本还是在减少欺诈事件方面,机器学习都能帮助企业应对他们面临的棘手挑战,把握发展机遇。如今,机器学习不再只是大型企业的专享,亚马逊云科... 详细信息

机器学习(ML)是当今世界极具变革性的技术之一。无论是在增强客户体验、提高员工生产力、削减成本还是在减少欺诈事件方面,机器学习都能帮助企业应对他们面临的棘手挑战,把握发展机遇。如今,机器学习不再只是大型企业的专享,亚马逊云科技已帮助逾10万客户在其核心业务中应用机器学习,包括从披萨订单量预测到医疗预诊的包罗万象的各种业务。

关键词：削减成本机器学习订单量客户体验变革性核心业务行业挑战亚马逊

Low temperature Raman scattering study of barium doped lead ytterbium tantalate ceramics

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Journal of Advanced Dielectrics 2017年第1期7卷 17-21页

作者： Dibyaranjan Rout Swetapadma Praharaj V.Subramanian V.sivasubramanian Department of Physics School of Applied SciencesKIIT University Bhubaneswar-751024OdishaIndia Department of Physics Indian Institute of TechnologyMadras Chennai-600036India Materials Science Division IGCARKalpakkam-603102India

Raman spectra of a complex perovskite system(Pb_(1-x)Ba_(x))(Yb_(0.5)Ta_(0.5))O_(3),x=0.0;0.1 and 0.2 have been studied at low temperature in the range of 10–250 *** fascination of the system is that it undergoes a crossover from a highly ordered antiferroelectric(x=0.0)to ferroelectric(x=0.1)to disordered relaxor ferroelectric(x=0.2).The nature of splitting that prevails in F_(2g)(≈60 cm^(-1)),F_(1g)(≈538 cm^(-1))modes and their gradual merging and disappearance with x indicates an orthorhombic symmetry for x=0.0 and a pseudo-cubic structure for x=*** mode at 420 cm^(-1) suggests the existence of rhombohedral distortion in all the *** soft mode behavior of the F2g modes has been analyzed by fitting the data with the power law ω_(s)=A(T_(C)-T)^(β).

关键词： Perovskite oxides B-site ordering Raman scattering soft mode

Optimization of Lab-Scale Preparation of Biodiesel from Rubber Seed Oil Using Modified Calcium Oxide as Catalyst

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Journal of Sustainable Bioenergy Systems 2016年第3期6卷 55-65页

作者： Uma Krishnakumar V. sivasubramanian Department of Chemical Engineering National Institute of Technology Calicut (NITC) Calicut India

Statistical analysis of product yield for biodiesel preparation by transesterification process was performed using the Minitab software. A standard RSM Design tool known as CCD was applied to study the transesterification reaction variables. The obtained parameters were verified experimentally for the transesterification reaction of rubber seed oil using solid metal oxide catalyst. The factors affecting the methyl ester yield during transesterification reaction were identified as the catalyst content, molar ratio of oil to alcohol and reaction time. High methyl ester yield and fast reaction rate could be obtained even if reaction temperature was relatively low, which is quite favorable to the industrial production of biodiesel from the rubber seed oil. 98.54% of methyl ester was formed from the transesterification of RSO with methanol. R-squared is a statistical measure of how close the data are to the fitted regression line. It is also known as the coefficient of determination, or the coefficient of multiple determination for multiple regression. In this study, an R2 value of 0.98 is obtained.

关键词： Biodiesel Rubber Seed Oil Transesterification Calcium Oxide