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Simultaneous removal of CO_(2), NO_(x) and SO_(x) using single stage 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 Engineering Michigan Technological UniversityHoughtonMl 49930USA

Capturing flue gases often require multiple stages of scrubbing, increasing the capital and operating costs. So far, no attempt has been made to study the absorption characteristics of all the three gases(NO, SO_(2) and CO_(2)) in a single stage absorption unit at alkaline p H conditions. We have attempted to capture all the three gases with a single wet scrubbing column. The absorption of all three gases with sodium carbonate solution promoted with oxidizers was investigated 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 gases were discussed individually in detail.

关键词： Carbon dioxide Nitric oxide Hydrogen peroxide Absorbance Kinetics

Opportunities and challenges 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 Engineering Michigan Technological UniversityHoughtonMI 49931USA

CO_(2) utilizations are essential to curbing the greenhouse gas effect and managing the environmental pollutant in an energy-efficient and economically-sound *** paper seeks to critically analyze these technologies in the context of each other and highlight 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 energy Supercritical CO_(2) Electrochemical reduction

Evidence of a Third Body and Photometric Solutions of a High Temperature Marginal 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

Marginal contact binary systems are an important class of binary systems in exploited by astronomers to understand various astrophysical phenomena as they bridge 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 light 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 light 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 signatures were found in the observed light curves which were also evident from the Hαline studies where the filled-in effect was not *** our study suggests that CW Aqr is a marginal contact binary with a low mass ratio evolving toward a semi-detached ***,it may merge if the period increases due to ongoing mass transfer accompanied by a lowering in the mass ratio and later oscillate back to the period-decreasing trend due to angular 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

Graph-based structural joint pose estimation in non-line-of-sight conditions

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Earthquake Engineering and Engineering 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 Engineering University of California-Los AngelesUSA Department of Civil and Environmental Engineering University of WaterlooCanada Department of Civil and Environmental Engineering University of California-Los AngelesUSA

In post-earthquake surveys,it is difficult(and often infeasible)to observe and quantify displacements beyond line-of-sight(LOS),given seismic force-resisting and gravity systems exist completely or partially within a building′s *** overcome this limitation,we develop a novel framework that generalizes graph-based state estimation towards structural joint localization via engineered *** landmarks provide an indirect means to estimate residual displacements where direct LOS is *** our framework,engineered landmarks define topologies 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 rigidly attached to non-visible landmark subsets for each engineered landmark,where the complete set of non-visible landmarks form globally rigid and localizable connectivity graphs via range-based *** subsets of non-visible landmarks are embedded within the base structure and uniquely define joint pose via geometric *** factors are unified within a common graph 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 average 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 gives insight into our method′s application towards post-earthquake building evaluation in non-LOS conditions.

关键词： state estimation engineered landmarks post-earthquake residual displacement

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

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

作者： Kandulapati sriram Pasagada Vivekananda Rao Department of Astronomy Osmania University

The light curve solutions of two W UMa binary systems in the intermediate open cluster NGC 7789 are presented in this paper. These variables were observed using the 2 m telescope of the IUCAA-Girawali Observatory. The V passband photo- metric solutions of the two W UMa binaries were obtained using the latest version of the W-D program. The result shows that both systems are H-subtype W UMa binaries with high mass ratios.

关键词： binaries: eclipsing- binaries: close

Optical and X-Ray Studies of Marginal 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

Marginal 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 degree 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 significantly 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

Significance of compaction time delay on compaction and strength characteristics of sulfate resistant cement-treated expansive soil

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1193-1202页

作者： P.sriram Karthick Raja T.Thyagaraj Department of Civil Engineering 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 insight 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 highlighted the use of sulfate to mitigate the negative effect of compaction time *** only drawback with the use of sulfate along with calcium-based stabilizers is the formation of ettringite,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 mitigate the negative 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 clogs and reduction of strength of SRC-stabilized expansive *** sulfate addition to SRC-stabilized expansive soil,the formation clogs was not curtailed and resulted in the formation of ettringite *** formations were captured with the help of scanning electron microscope(SEM)images and validated with electron dispersive X-ray spectroscopy(EDAX)***,an attempt is also made to explain the mechanism of density and strength reduction with the aid of physico-chemical properties and mercury intrusion porosimetry(MIP)studies.

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

Photovoltaic Cell Panels Soiling Inspection Using Principal Component Thermal Image Processing

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Computer Systems Science & Engineering 2023年第6期45卷 2761-2772页

作者： A.sriram T.D.Sudhakar Arasu Engineering College KumbakonamTamilnadu612501India St.Joseph’s College of Engineering ChennaiTamilnadu600119India

Intended for good productivity and perfect operation of the solar power grid a failure-free system is ***,thermal image processing with the thermal camera is the latest non-invasive(without manual contact)type fault identification technique which may give good precision in all *** soiling issue,which is major productivity affecting factor may import from several reasons such as dust on the wind,bird mucks,*** efficient power production sufferers due to accumulated soil deposits reaching from 1%–7%in the county,such as India,to more than 25%in middle-east countries country,such as Dubai,Kuwait,*** research offers a solar panel soiling detection system built on thermal imaging which powers the inspection method and mitigates the requirement for physical panel inspection in a large solar production ***,in this method,solar panels can be verified by working without disturbing production operation and it will save time and price of *** ranks 3rd worldwide in the usage use age of Photovoltaic(PV)panels now and it is supported about 8.6%of the Nation’s electricity need in the year *** the meantime,the installed PV production areas in India are aged 4–5 years *** the need for inspection and maintenance of installed PV is growing fast day by *** a result,this research focuses on finding the soiling hotspot exactly of the working solar panels with the help of Principal Components Thermal Analysis(PCTA)on MATLAB Environment.

关键词： PV cell thermal imaging PCTA(Principal Components Thermal Analysis) PV cell soiling detection

Photometric study of eclipsing binaries in the Large Magellanic Cloud--I.W UMa type binaries in the Large Magellanic Cloud

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Research in Astronomy and Astrophysics 2011年第2期11卷 175-180页

作者： Devarapalli Shanti Priya Kandulapati sriram Pasagada Vivekananda Rao Department of Astronomy Osmania University Korea Astronomy and Space Science Institute

Eclipsing binaries are among the most important sources of information on stellar parameters like radii,masses,luminosities,*** present the analysis of six W UMa systems discovered in the Large Magellanic Cloud using ... 详细信息

关键词： binaries: eclipsing -- binaries: close