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A new two-degree of freedom combined PID controller for automatic generation control of a wind integrated interconnected power system

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Protection and Control of Modern Power systems 2022年第1期7卷 300-315页

作者： Appala naidu Karanam Binod shaw Department of Electrical Engineering National Institute of TechnologyRaipurIndia

Frequency control of an interconnected power system in the presence of wind integration is complex since wind speed/power variations also affect system frequency in addition to load ***,improving existing control schemes is necessary to maintain a stable frequency in such complex power system *** this paper,a new 2-degree of freedom combined proportional-integral and derivative control scheme is applied to a wind integrated interconnected power *** designing the controller,several inputs used for a secondary frequency control loop are considered along with the merits of the existing *** combined controller provides better control action than existing controllers in the presence of wind as is evidenced by the wide variety of results *** tuning of the controller gains,a crow search optimization algorithm(CRsOA)is *** are obtained via the MATLAB/simulink software.

关键词： Load frequency control 2-DOF-PID controller Crow search optimization algorithm

Detection of latent fingerprints using luminescent Gd_(0.95)Eu_(0.05)PO_(4) nanorods

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Journal of Rare Earths 2022年第4期40卷 572-578,I0003页

作者： Pushpendra Indranil suryawanshi Rimple Kalia Ravi K.Kunchala shyam Lal Mudavath Boddu s.naidu Energy and Environment Unit Institute of Nano Science and Technology(INST)MohaliPunjab-140306India Chemical Biology Unit Institute of Nano Science and Technology(INST)MohaliPunjab-140306India

Lanthanide ions doped luminescent materials are widely studied for latent fingerprint ***,most of these materials are synthesized at very high temperatures and use UV C light for visualization,which is harmful to eye,skin,***,the Gd_(0.95)Eu_(0.05)PO_(4) nanorods synthesized by a simple co-precipitation method at 185℃ were reported for latent fingerprint visualization under 395 nm *** Gd_(0.95)Eu_(0.05)PO_(4) nanomaterial has monoclinic crystal structure and shows rod-shaped ***,these Gd_(0.95)Eu_(0.05)PO_(4) nanorods exhibit excellent photoluminescence properties and strong fuchsia emission under UV *** nanorods have been employed for developing latent fingerprints on various porous and non-porous substrates by the powder dusting technique,which exhibits clear and well defined details with high contrast,selectivity and sensitivity under 395 nm UV *** fingerprints developed after 72 h of their deposition also show clear contrast with these ***,the Gd_(0.95)Eu_(0.05)PO_(4) nanorods can be used for latent fingerprint visualization applications.

关键词： GdPO_(4) Nanorods Europium Photoluminescence Latent fingerprint visualization Rare earths

Minimisation of electric field stress at triple junction of a functionally graded cone type spacer in a gas insulated busduct with metal inserts

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High Voltage 2017年第2期2卷 110-118页

作者： Yerra swamy naidu Gundavarapu Venkata Nagesh Kumar Department of EEE Vizag Institute of TechnologyVisakhapatnamIndia Department of EEE Vignan's Institute of Information TechnologyVisakhapatnamIndia

Insulation integrity of supporting insulator plays a vital role for determining the continuity of service of the gas insulated substation which depends upon the electric field stress distribution on the surface of the *** junction formed by the conductor,sF6 gas and support insulator is another critical area where the field stress is to be maintained at minimum *** control is a technique employed for obtaining uniform field stress along the surface of the spacer but this technique may sometimes leads to very uneven *** this study,a functional graded material is designed for the standard cone type spacer to obtain uniform field stress along the surface of spacer to overcome the above *** grading of spacer is done with different *** field is computed for three cases namely grading to high,grading to low and U *** metal inserts were tuned and stress is obtained in account of lower fields at the triple point junction and an improved uniform field distribution along the surface is obtained.

关键词： stress graded field

Mercury remediation potential of a mercury resistant strain sphingopyxis ***2 isolated from contaminated soil

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Journal of Environmental sciences 2017年第1期29卷 128-137页

作者： Khandaker Rayhan Mahbub Kannan Krishnan Ravi naidu Mallavarapu Megharaj Global Centre for Environmental Remediation(GCER) Cooperative Research Centre for Contamination Assessment and Remediation of the Environment(CRC-CARE)Faculty of Science and Information TechnologyThe University of NewcastleCallaghanNSW 9308Australia.

A mercury resistant bacterial strain sE2 was isolated from contaminated *** 16 s rRNA gene sequencing confirms the strain as sphingopyxis belongs to the sphingomonadaceae family of the α-Proteobacteria *** isolate showed high resistance to mercury with estimated concentrations of Hg that caused 50%reduction in growth（EC_（50）） of 5.97 and 6.22 mg/L and minimum inhibitory concentrations（MICs） of 32.19 and 34.95 mg/L in minimal and rich media,*** qualitative detection of volatilized mercury and the presence of mercuric reductase enzyme proved that the strain sE2 can potentially remediate ***-QQQ-Ms analysis of the remaining mercury in experimental broths indicated that a maximum of 44%mercury was volatilized within 6 hr by live sE2 *** a small quantity（23%） of mercury was accumulated in live cell *** no volatilization was caused by dead cells,sorption of mercury was *** mercuric reductase gene merA was amplified and *** was observed among the amino acid sequences of mercuric reductase enzyme of different organisms from a-Proteobacteria and ascomycota groups,

关键词： Mercury resistance sphingopyxis Mercury volatilization Mercury remediation Mercury reductase

secure workflow scheduling in cloud environment using modified particle swarm optimization with scout adaptation

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International Journal of Modeling, simulation, and scientific Computing 2018年第1期9卷 74-95页

作者： P.sanyasi naidu Babita Bhagat Department of Computer science and Engineering Gitam University Visakhapatnam 530045Andhra PradeshIndia Department of Computer Engineering Pillai HOC College of Engineering and TechnologyRasayaniKhalapur 410207MaharashtraIndia

In the distributed data-intensive computing environment,securely assigning tasks to appropriate machines is a big job scheduling *** complexity of this problem increases with the number of jobs and their job *** meta-heuristic algorithms including particle swarm optimization(PsO)technique and variable neighborhood particle swarm optimization(VNPsO)technique are employed to solve the problem to a certain *** paper proposes a modified PsO with scout adaptation(MPsO-sA)algorithm,which uses a cyclic term called mutation operator,to solve the job scheduling problem in the cloud *** comparative study between the proposed MPsO-sA scheduling mechanism and the conventional scheduling algorithms show that the proposed method decreases the probability of security risk on scheduling the jobs.

关键词： Cloud scheduling meta-heuristic MPsO-sA GA PsO VNPsO

Bioavailability of Arsenic and Antimony in Terrestrial Ecosystems:A Review

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Pedosphere 2019年第6期29卷 681-720页

作者： saeed BAGHERIFAM Trevor CBROWN Christopher MFELLOWs Ravi naidu Chemistry-school of science and Technology University of New EnglandArmidale NSW 2351(Australia Global Centre for Environmental Remediation Faculty of Science and Inform ation TechnologyUniversity o f NewcastleUniversity DriveCallaghan N S W 2308(Australia

Arsenic (As) and antimony (sb) are metalloids that belong to group 15 of the periodic table and exhibit toxic properties in the environment. They mostly occur naturally at low concentrations in soil, although these can be significantly elevated in both aquatic and terrestrial food chains as a result of dispersion from anthropogenic sources, e.g ., mining activities. The bioavailability, i.e., the proportion of the contaminant in soil and dust that is available for uptake by plants and other living organisms, presents the greatest risk to terrestrial ecosystems. Various in vivo and in vitro methods have been used to measure As and sb bioaccessibility in soil and dust. In vivo measurement of bioavailability can be time consuming, expensive, and unethical;thus, in vitro methods are commonly preferred. However, there is considerable uncertainty around the efficacy of in vitro tools used to measure the bioavailable fractions of As and sb. The results of these methods are dependent on many variables, e.g., soil characteristics, contaminant sources, and chemical composition of in vitro methods. Therefore, substantial variations are observed between in vitro and in vivo results obtained from different test animals and endpoints. In this paper, we review the literature on As and sb bioavailability in terrestrial ecosystems and current in vivo and in vitro techniques used for assessing bioavailability and bioaccessibility of metalloids. This would reveal research gaps and allow scientists and environmental policy makers to gain a deeper understanding of the potential risks associated with these metalloids in the environment.

关键词： Bioaccessibility Bioavailable fraction Contamination Environmental risk assessment Metalloids Phytoavailability Relative bioavailability soil characteristics Toxicant

A review of electrokinetically enhanced bioremediation technologies for PHs

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Journal of Environmental sciences 2020年第2期32卷 31-45页

作者： Anish saini Dawit Nega Bekele sreenivasulu Chadalavada Cheng Fang Ravi naidu Global Centre for Environmental Remediation University of NewcastleCallaghanNewcastle 2308NSWAustralia Cooperative Research Centre for Contamination Assessment and Remediation of the Environment(CRC CARE) University of NewcastleCallaghanNewcastle 2308NSWAustralia

since the early 1980’s there have been several different strategies designed and applied to the remediation of subsurface environment including physical, chemical and biological *** have had varying degrees of success in remediating contaminants from subsurface soils and *** objective of this review is to examine the range of technologies for the remediation of contaminants, particularly petroleum hydrocarbons, in subsurfaces with a specific focus on bioremediation and electrokinetic ***, this review examines the efficiency of remediation carried out by combining bioremediation and electrokinetic ***, which are slowly becoming the selected chemicals for mobilizing contaminants, are also considered in this *** current knowledge gaps of these technologies and techniques identified which could lead to development of more efficient ways of utilizing these technologies or development of a completely new technology.

关键词： subsurface contamination Remediation Petroleum hydrocarbons (PH) Electrokinetics Bioremediation

Early warning system for shallow landslides using rainfall threshold and slope stability analysis

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Geoscience Frontiers 2018年第6期9卷 1871-1882页

作者： shruti naidu K.s.sajinkumar Thomas Oommen V.J.Anuja Rinu A.samuel C.Muraleedharan Department of Earth sciences Pondicherry UniversityPondicherry 605 014India Department of Geology University of KeralaThiruvananthapuram 695 581KeralaIndia Department of Geological&Mining Engineering&sciences Michigan Technological University1400 Townsend DriveHoughtonMI 49931USA Department of Civil Engineering University of TexasArlingtonTX 76019USA Geological survey of India Thiruvananthapuram 695 013KeralaIndia

A combined cluster and regression analysis were performed for the first time to identify rainfall threshold that triggers landslide events in Amboori, Kerala, India. Amboori is a tropical area that is highly vulnerable to landslides. The 2, 3, and 5-day antecedent rainfall data versus daily rainfall was clustered to identify a cluster of critical events that could potentially trigger landslides. Further, the cluster of critical events was utilized for regression analysis to develop the threshold equations. The 5-day antecedent(xvariable) vs. daily rainfall(y-variable) provided the best fit to the data with a threshold equation of y = 80.7-0.1981 x. The intercept of the equation indicates that if the 5-day antecedent rainfall is zero, the minimum daily rainfall needed to trigger the landslide in the Amboori region would be 80.7 mm. The negative coefficient of the antecedent rainfall indicates that when the cumulative antecedent rainfall increases, the amount of daily rainfall required to trigger monsoon landslide decreases. The coefficient value indicates that the contribution of the 5-day antecedent rainfall is～20% to the landslide trigger threshold. The slope stability analysis carried out for the area, using Probabilistic Infinite slope Analysis Model(PIsA-m), was utilized to identify the areas vulnerable to landslide in the region. The locations in the area where past landslides have occurred demonstrate lower Factors of safety(Fs) in the slope stability analysis. Thus, rainfall threshold analysis together with the Fs values from slope stability can be suitable for developing a simple, cost-effective, and comprehensive early-warning system for shallow landslides in Amboori and similar regions.

关键词： Landslide Cluster analysis Rainfall threshold analysis Factor of safety slope stability analysis PIsA-m

Effect of Root-Induced Chemical Changes on Dynamics and Plant Uptake of Heavy Metals in Rhizosphere soils

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Pedosphere 2010年第4期20卷 494-504页

作者： K.R.KIM G.OWENs R.naidu Climate Change & Agroecology Division Department of Agricultural EnvironmentNational Academy of Agricultural Science Centre for Environmental Risk Assessment and Remediation University of South Australia Cooperative Research Centre for Contamination Assessment and Remediation of the Environment

It is increasingly recognized that metal bioavailability is a better indicator of the potential for phytoremediation than the total metal concentration in soils; therefore, an understanding of the influence of phytoremediation plants on metal dynamics at the soil-root interface is increasingly vital for the successful implementation of this remediation technique. In this study, we investigated the heavy metal and soil solution chemical changes at field moisture, after growth of either Indian mustard （Brassica juncea） or sunflower （Helianthus annuus L.）, in long-term contaminated soils and the subsequent metal uptake by the selected plants. In addition, the fractions of free metal ions in soil solution were determined using the Donnan membrane technique. After plant growth soil solution pH increased by 0.2-1.4 units and dissolved organic carbon （DOC） increased by 1-99 mg L^-1 in all soils examined. soluble Cd and Zn decreased after Indian mustard growth in all soils examined, and this was attributed to increases in soil solution pH （by 0.9 units） after plant growth. Concentrations of soluble Cu and Pb decreased in acidic soils but increased in alkaline soils. This discrepancy was likely due to a competitive effect between plant-induced pH and DOC changes on the magnitude of metal solubility. The fractions of free Cd and Zn ranged from 7.2% to 32% and 6.4% to 73%, respectively, and they generally decreased as pH and DOC increased after plant growth. Metal uptake by plants was dependant on the soil solution metal concentration, which was governed by changes in pH and DOC induced by plant exudates, rather than on the total metal concentrations. Although plant uptake also varied with metal and soil types, overall soluble metal concentrations in the rhizosphere were mainly influenced by root-induced changes in pH and DOC which subsequently affected the metal uptake by plants.

关键词： bioavailability phytoremediation speciation