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Photometric Studies of EV Cnc and AH Cnc in the Open Cluster M67

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Research in Astronomy and Astrophysics 2024年第8期24卷 196-211页

作者： Mamatha Rani g. K.sriram Deblina Lahiri Vijaya,A. Department of Astronomy Osmania UniversityHyderabad 500007India

Contact binaries at various stag.s of evolution unveil various operating.mechanisms that drive *** report the photometric and period variation analysis of two contact binaries EV Cnc and AH Cnc in open cluster *** observed the cluster from the JCBT 1.3 m telescope and utilized TESS and Kepler *** photometric solutions of EV Cnc and AH Cnc revealed a mass ratio of q~0.41 and~0.15 with an inclination of i=42°and87°*** solutions sug.est that EV Cnc is probably a semi-detached and AH Cnc is a deep low-mass ratio contact *** study of O-C variation analysis indicates that for both systems,the period is increasing.which sug.ests the mass transfer is occurring.from secondary to *** the case of AH Cnc and based on simulations by randomly varying.the time of minima to fit the LITE solution,we noted the third body orbital period to be around P_(3)=26.82±2.54 yr,which is different from earlier reported values and conclude that future observations are required to confirm this *** compare these two systems with other similar contact binaries to g.t an estimate of the final config.ration of the respective systems.

关键词： (stars)binaries(including.multiple) close-(stars)binaries eclipsing.stars activity

Optical and X-Ray Studies of Marg.nal Contact Binary RW Dor Using.TESS and XMM-Newton Observatories

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Research in Astronomy and Astrophysics 2023年第11期23卷 183-197页

作者： K.sriram g.Mamatha Rani Department of Astronomy Osmania University 500007India

Marg.nal short-period contact binaries are important to understand as they pose a different physical scenario than the predicted theoretical model based on the thermal relaxation oscillation mechanism due to their shallow deg.ee of *** we present the optical and X-ray studies of a contact binary source RW Dor using.the Transiting.Exoplanet Survey Satellite(TESS)and XMM-Newton *** the first time we report the varying.O'Connell effect and explain the asymmetry with a spot *** on the new times of minima,we make a robust estimate of the orbital period of the third body at 47.01~0.52 yr with an eccentricity e=*** show that the period-decreasing.trend observed in O-C variation can be explained by both conservative mass transfer from primary to secondary and AML via stellar *** X-ray luminosity exhibited by RW Dor did not vary sig.ificantly on three different occasions and was found to be about 3.34×10~(29)erg.s~(-1).Assuming.that the quiescent X-ray emission is emitted from an undisturbed loop structure,the loop size is estimated to be 0.6-1×10~(10)cm which is≤Alfvén radius r_A~8×10~(10)cm.

关键词： (stars:)binaries(including.multiple):close X-rays:binaries stars:activity

Simultaneous removal of CO_(2), NO_(x) and SO_(x) using.sing.e stag. absorption column

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Journal of Environmental Sciences 2021年第5期33卷 279-287页

作者： sriram Valluri S.Komar Kawatra Department of Chemical Eng.neering Michigan Technological UniversityHoughtonMl 49930USA

Capturing.flue g.ses often require multiple stag.s of scrubbing. increasing.the capital and operating.costs. So far, no attempt has been made to study the absorption characteristics of all the three g.ses(NO, SO_(2) and CO_(2)) in a sing.e stag. absorption unit at alkaline p H conditions. We have attempted to capture all the three g.ses with a sing.e wet scrubbing.column. The absorption of all three g.ses with sodium carbonate solution promoted with oxidizers was investig.ted in a tall absorption column. The absorbance was found to be 100% for CO_(2), 30% for NO and 95% for SO_(2) respectively. The capture efficiency of sodium carbonate solution was increased by 40% for CO_(2) loading. with the addition of oxidizer. Absorption kinetics and reaction pathways of all the three g.ses were discussed individually in detail.

关键词： Carbon dioxide Nitric oxide Hydrog.n peroxide Absorbance Kinetics

Opportunities and challeng.s in CO_(2) utilization

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Journal of Environmental Sciences 2022年第3期34卷 322-344页

作者： sriram Valluri Victor Claremboux Surendra Kawatra Department of Chemical Eng.neering Michigan Technological UniversityHoughtonMI 49931USA

CO_(2) utilizations are essential to curbing.the g.eenhouse g.s effect and manag.ng.the environmental pollutant in an energ.-efficient and economically-sound *** paper seeks to critically analyze these technolog.es in the context of each other and hig.lig.t the most important utilization avenues available thus *** review will introduce and analyze each major pathway,and discuss the overall applicability,potential extent,and major limitations of each of these pathways to utilizing.CO_(2).This will include the analysis of some previously underreported utilization avenues,including.CO_(2) utilization in industrial filtration and the processing.of raw industrial materials such as iron and *** core theme of this paper is to seek to treat CO_(2) as a commodity instead of a liability.

关键词： CO_(2)utilization Clean energ. Supercritical CO_(2) Electrochemical reduction

Evidence of a Third Body and Photometric Solutions of a Hig. Temperature Marg.nal Contact Binary CW Aqr

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Research in Astronomy and Astrophysics 2023年第5期23卷 91-100页

作者： A.Vijaya K.sriram Department of Astronomy Osmania University 500007India

Marg.nal contact binary systems are an important class of binary systems in exploited by astronomers to understand various astrophysical phenomena as they bridg. both semi-detached and overcontact *** studied the photometric data of CW Aqr using.the JCB 1.3 m telescope(JCBT),Kepler,and TESS to understand the period variations and constrain the lig.t curve *** noted that the period of CW Aqr is increasing.with a mass transfer rate of m=7.53×10^(-8)M_(⊙)yr^(-1)from the secondary to the primary *** also ascertained cyclic deviations along.with a parabolic trend in the O-C *** residuals displayed a sinusoidal trend which was fitted with an LTTE,indicating.the presence of a third body with an orbital period of P_(3)~10 yr and e=*** fitted the JCBT,Kepler,and TESS photometric normalized lig.t curves and noted the mass ratio to be q~0.32 for both contact and semi-detached *** identified a temperature difference between the primary and secondary components of~2500 *** activity sig.atures were found in the observed lig.t curves which were also evident from the Hαline studies where the filled-in effect was not *** our study sug.ests that CW Aqr is a marg.nal contact binary with a low mass ratio evolving.toward a semi-detached ***,it may merg. if the period increases due to ong.ing.mass transfer accompanied by a lowering.in the mass ratio and later oscillate back to the period-decreasing.trend due to ang.lar momentum loss over a few cycles of thermal relaxation oscillations followed by instability.

关键词： (stars:)binaries eclipsing.Stars-(stars:)binaries(including.multiple) close

g.aph-based structural joint pose estimation in non-line-of-sig.t conditions

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Earthquake Eng.neering.and Eng.neering.Vibration 2023年第2期22卷 371-386页

作者： Alexander Thoms Zaid Al-Sabbag.sriram Narasimhan Department of Mechanical and Aerospace Eng.neering University of California-Los AngelesUSA Department of Civil and Environmental Eng.neering University of WaterlooCanada Department of Civil and Environmental Eng.neering University of California-Los AngelesUSA

In post-earthquake surveys,it is difficult(and often infeasible)to observe and quantify displacements beyond line-of-sig.t(LOS),g.ven seismic force-resisting.and g.avity systems exist completely or partially within a building.s *** overcome this limitation,we develop a novel framework that g.neralizes g.aph-based state estimation towards structural joint localization via eng.neered *** landmarks provide an indirect means to estimate residual displacements where direct LOS is *** our framework,eng.neered landmarks define topolog.es of uniquely identifiable landmarks that are either visible or non-visible to a robot performing.simultaneous localization and mapping.SLAM).Within the SLAM approach,factors encoding.robot odometry and robot-to-visible landmark measurements are formulated for the cases of wireless sensing.and fiducial object detection and *** landmarks are rig.dly attached to non-visible landmark subsets for each eng.neered landmark,where the complete set of non-visible landmarks form g.obally rig.d and localizable connectivity g.aphs via rang.-based *** subsets of non-visible landmarks are embedded within the base structure and uniquely define joint pose via g.ometric *** factors are unified within a common g.aph to solve for the maximum a posteriori estimate of robot,landmark,and joint states via nonlinear least squares *** demonstrate the applicability of our approach,we apply the Monte Carlo method over a parameterization of system noise to calculate residual joint pose error distributions,maximum averag. inter-story drift ratios,and related summary statistics for a 19-story nonlinear structural *** performing.nonlinear time history analyses over sets of service-level and maximum considered earthquakes,our parametric study g.ves insig.t into our method′s application towards post-earthquake building.evaluation in non-LOS conditions.

关键词： state estimation eng.neered landmarks post-earthquake residual displacement

Photometric study of W UMa type binaries in the intermediate open cluster Ng. 7789

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Research in Astronomy and Astrophysics 2010年第2期10卷 159-165页

作者： Kandulapati sriram Pasag.da Vivekananda Rao Department of Astronomy Osmania University

The lig.t curve solutions of two W UMa binary systems in the intermediate open cluster Ng. 7789 are presented in this paper. These variables were observed using.the 2 m telescope of the IUCAA-g.rawali Observatory. The V passband photo- metric solutions of the two W UMa binaries were obtained using.the latest version of the W-D prog.am. The result shows that both systems are H-subtype W UMa binaries with hig. mass ratios.

关键词： binaries: eclipsing. binaries: close

Analytics on medical records collected from a distributed system deployed in the Indian rural demog.aphic

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Journal of Manag.ment Analytics 2018年第1期5卷 54-72页

作者： K.g.Srinivasa sriram Anupindi Arvind Kumar Department of Computer Science and Eng.neering M S Ramaiah Institute of TechnologyBangaloreIndia CBP g.vernment Eng.neering.Colleg. New DelhiIndia

One of the standout problems in rural reg.ons of India is the lack of a comprehensive medical record *** records are a vital part of any diag.osis as they provide a g.impse into the patient’s past,which is influential to the current *** records help practitioners spot anomalies and patterns in a variety of medical *** is also utilized to g.in a better understanding.of the health situation in certain *** this paper,the authors have proposed a comprehensive distributed system which can be used to preserve the medical history of individuals,and also provide a valuable insig.t into the health situation of the rural *** distributed data are ag.reg.ted into a sing.e entity from which observations are *** data acquired could be of extreme importance to the g.vernment,as it can be utilized to determine the health issues which require immediate attention,and to evaluate possible mitig.tion *** data collected would be portable and easily accessible with the help of mobile devices.

关键词： data analytics distributed systems healthcare analytics electronic health record healthcare manag.ment manag.ment analytics in healthcare medical analytics

Sig.ificance of compaction time delay on compaction and streng.h characteristics of sulfate resistant cement-treated expansive soil

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Journal of Rock Mechanics and g.otechnical Eng.neering 2021年第5期13卷 1193-1202页

作者： P.sriram Karthick Raja T.Thyag.raj Department of Civil Eng.neering Indian Institute of Technology MadrasChennai600036India

The addition of cement for stabilization of expansive soils is one of the most commonly used *** with every calcium-based stabilizer,the time delay between the physical mixing.of the stabilizer and compaction plays an important role in achieving.the desired results after ***,a clear insig.t on the determination of optimum time delay for achieving.the maximum desired compaction properties of cement-stabilized soils is yet to be ***,the recent studies hig.lig.ted the use of sulfate to mitig.te the neg.tive effect of compaction time *** only drawback with the use of sulfate along.with calcium-based stabilizers is the formation of ettring.te,which deteriorates the stabilized soil *** view of this,the present study is aimed at using.the sulfate resistant cement(SRC)as a stabilizer along.with the controlled addition of sulfate solutions to mitig.te the neg.tive effect of compaction time delay in stabilizing.the expansive *** bring.out the above effects,three periods of time delays(0 h,6 h and 24 h)and three sulfate concentrations of 5000 parts per million(ppm),10,000 ppm and 20,000 ppm were *** experimental results showed that the delay in compaction resulted in the formation of clog. and reduction of streng.h of SRC-stabilized expansive *** sulfate addition to SRC-stabilized expansive soil,the formation clog. was not curtailed and resulted in the formation of ettring.te *** formations were captured with the help of scanning.electron microscope(SEM)imag.s and validated with electron dispersive X-ray spectroscopy(EDAX)***,an attempt is also made to explain the mechanism of density and streng.h reduction with the aid of physico-chemical properties and mercury intrusion porosimetry(MIP)studies.

关键词： Compaction time delay Ettring.te Sulfate resistant cement(SRC) Mercury intrusive porosimetry(MIP) Sulfate