Use of electrical resistivity method to quantify accumulated sediments in Wellington reservoir, India

Jagannathan Shanmugam,Krishnaveni Muthiah,Mathiazhagan Mookiah 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.1

Accumulated Sediment layer thickness is an important parameter to assess the capacity lost in any reservoir. The study focuses on assessing the quantity and depth of sediment layers at various points of Wellington reservoir using geophysical survey method. This electrical resistivity survey was done in fifteen locations in Wellington reservoir using ABEM Terrameter SAS 1000 with Schlumberger electrode arrangement. The data interpretation was carried out using IX1D v2 software. The results revealed that the resistivity of deposited sediments carried by inflow water ranges from, 0.8 Ωm to 58 Ωm and Sampling of sediments was done in those vertical electrical sounding points to validate the results and to characterize the type of soil. The thickness of sediments is around 4 m near embankments and around 0.5 m thickness in the far ends of the reservoir. This study also revealed the native bed level of the reservoir and also the total volume of sediments of about 30.51 × 106 m3 which is responsible for the capacity loss of reservoir. Reservoir management practices against sedimentation like dredging needs information about the depth and distribution of sedimentdeposition. This method can only be adopted when the reservoir is dry and will give optimum results of sediment deposition by giving their depths.

Sensitivity to Nuclear Data Libraries in the Physics Core Characteristics of Conceptual Thorium Breeders

V. Jagannathan,U. Pal,R. Karthikeyan,A. Srivastava,S. A. Khan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23

Nuclear data plays a vital role in the design of nuclear power reactors, especially for new conceptual ones where adequate validation base does not exist. For the continuity of ssion nuclear power beyond the present day power reactors operated in an open cycle mode, it is necessary to explore the possibility of reactor designs with higher conversion, rather higher breeding potential. In this context two reactor designs in the thermal and fast spectrum have been conceived having the above desired characteristics. The thermal version called `A Thorium Breeder Reactor' (ATBR) has conversion ratio higher by about 55% compared to an LWR [1]. The fast version called the `Fast Thorium Breeder Reactor' (FTBR) considers internal blanket or fissile breeding zones and hence has a reasonably high breeding ratio of at least 1.25 [2]. In this paper we present the variations in the salient physical core characteristics of the thermal version for three different sets of nuclear data libraries based on ENDFB/VI.8, ENDFB/VII and JEFF3.1 datasets [3].

Role of Anatomical Landmarks in Identifying Normal and Transitional Vertebra in Lumbar Spine Magnetic Resonance Imaging

Devimeenal Jagannathan,Venkatraman Indiran,Fouzal Hithaya,M. Alamelu,S. Padmanaban 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3

Study Design: Retrospective study. Purpose: Identification of transitional vertebra is important in spine imaging, especially in presurgical planning. Pasted images of the whole spine obtained using high-field magnetic resonance imaging (MRI) are helpful in counting vertebrae and identifying transitional vertebrae. Counting vertebrae and identifying transitional vertebrae is challenging in isolated studies of lumbar spine and in studies conducted in low-field MRI. An incorrect evaluation may lead to wrong-level treatment. Here, we identify the location of different anatomical structures that can help in counting and identifying vertebrae. Overview of Literature: Many studies have assessed the vertebral segments using various anatomical structures such as costal facets (CF), aortic bifurcation (AB), inferior vena cava confluence (IC), right renal artery (RRA), celiac trunk (CT), superior mesenteric artery root (SR), iliolumbar ligament (ILL) psoas muscle (PM) origin, and conus medullaris. However, none have yielded any consistent results. Methods: We studied the locations of the anatomical structures CF, AB, IC, RRA, CT, SR, ILL, and PM in patients who underwent whole spine MRI at our department. Results: In our study, 81.4% patients had normal spinal segmentation, 14.7% had sacralization, and 3.8% had lumbarization. Vascular landmarks had variable origin. There were caudal and cranial shifts with respect to lumbarization and sacralization. In 93.8% of cases in the normal group, ILL emerged from either L5 alone or the adjacent disc. In the sacralization group, ILL was commonly seen in L5. In the lumbarization group, ILL emerged from L5 and the adjacent disc (66.6%). CFs were identified at D12 in 96.9% and 91.7% of patients in the normal and lumbarization groups, respectively. The PM origin was observed from D12 or D12–L1 in most patients in the normal and sacralization groups. Conclusions: CF, PM, and ILL were good identification markers for D12 and L5, but none were 100% accurate.

스마트시티 운영의 요소들

비제이 자가나단(Vijay Jagannathan) 국토교통부, 국토교통과학기술진흥원 2023 스마트시티 탑 아젠다(Smart City Top Agenda) Vol.3 No.1

Elements of Smart City Management

비제이 자가나단(Vijay Jagannathan) MOLIT(국토교통부), KAIA(국토교통과학기술진흥원) 2023 스마트시티 탑 아젠다(Smart City Top Agenda) Vol.3 No.E

Controlled Synthesis and Luminescence Properties of Ca0.5Y1-x(MoO4)2:xRE3+ (RE = Eu, Pr, Sm, Tb, Dy, Yb/Er, Yb/Tm, and Yb/Ho) Phosphors by Hydrothermal Method Versus Pulsed Laser Deposition

Venkatakrishnan Mahalingam,Jagannathan Thirumalai,Rajagopalan Krishnan,Rathinam Chandramohan 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.1

Herein, we report on rare-earth (RE) activated Ca0.5Y1-x(MoO4)2:xRE3+(RE = Eu, Pr, Sm, Tb, Dy, Yb/Er, Yb/Ho, and Yb/Tm) phosphorssynthesized using a surfactant-mediated hydrothermal route. Timedependentexperiments were performed, and the morphological evolutionof the phosphors was studied. From prepared powder samples ofCa0.5Y1-x(MoO4)2:xRE3+ (RE = Eu and Yb/Er), nano-sized thin phosphorfilms were grown using pulsed laser deposition (PLD). The surfacetopography of the as-grown thin phosphor films was analyzed. The aspreparedphosphors were characterized by structural and optical studies. The powder phosphor exhibited bi pyramid-like micro-architectures. Structural studies indicated that Ca0.5Y1-x(MoO4)2 possesses the scheelitetetragonal crystal structure. The down-conversion luminescence ofCa0.5Y1-x(MoO4)2:xRE3+ (RE = Eu, Pr, Sm, Tb, and Dy) as powderphosphors and Eu3+ doped Ca0.5Y1-x(MoO4)2 thin phosphor film werestudied. Upon irradiation with a 980 nm laser, the Ca0.5Y1-x(MoO4)2:xRE3+ (RE = Yb/Er, Yb/Ho, and Yb/Tm) powder phosphors andCa0.5Y1-x(MoO4)2:xRE3+ (RE = Yb/Er) thin phosphor film showed intenseup-converted visible emissions in green, yellow, and blue regions. Thefluorescence decay time and color co-ordinates were determined for allsynthesized phosphors. From the obtained results, the prepared powderand thin film phosphors are suggested to be suitable candidates fordisplay and electro-luminescence applications.

Luminescence and Magnetic Properties of Novel Nanoparticle-Sheathed 3D Micro-Architectures of Fe0.5R0.5(MoO4)1.5:Ln3+ (R = Gd3+, La3+), (Ln = Eu, Tb, Dy) for Bifunctional Application

Rajagopalan Krishnan,Jagannathan Thirumalai,Arunkumar Kathiravan 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1

For the first time, we report the successful synthesis ofnovel nanoparticle-sheathed bipyramid-like and almond-likeFe0.5R0.5(MoO4)1.5:Ln3+ (R = Gd3+, La3+), (Ln = Eu, Tb, Dy) 3Dhierarchical microstructures through a simple disodium ethylenediaminetetraaceticacid (Na2EDTA) facilitated hydrothermalmethod. Interestingly, time-dependent experiments confirmthat the assembly-disassembly process is responsible for theformation of self-aggregated 3D architectures via Ostwald ripeningphenomena. The resultant products are characterized byx-ray diffraction (XRD), field emission scanning electronmicroscopy (FESEM), high resolution transmission electronmicroscopy (HRTEM), photoluminescence (PL), and magneticmeasurements. The growth and formation mechanisms of theself-assembled 3D micro structures are discussed in detail. Toconfirm the presence of all the elements in the microstructure,the energy loss induced by the K, L shell electron ionization isobserved in order to map the Fe, Gd, Mo, O, and Eu components. The photo luminescence properties of Fe0.5R0.5(MoO4)1.5doped with Eu3+, Tb3+, Dy3+ are investigated. The room temperature and low temperature magnetic properties suggest that theinteraction between the local-fields introduced by the magnetic Fe3+ ions and the R3+ (La, Gd) ions in the dodecahedral sitesdetermine the magnetism in Fe0.5R0.5(MoO4)1.5:Eu3+. This work provides a new approach to synthesizing the novelFe0.5R0.5(MoO4)1.5:Ln3+ for bi-functional magnetic and luminescence applications.

Polystyrene-halloysite nano tube membranes for water purification

Kezia Buruga,Jagannathan T. Kalathi,김기현,옥용식,Boukhvalov Danil 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-

Membrane technologies are a sustainable solution for treatment of water and wastewater. Here, the technical feasibility of polystyrene-halloysite nanotube (PS-HNT) membranes, fabricated by an ultrasound-assisted solution casting method, was explored for water purification. To this end, the effects of various solvents on the structure, morphology, thermal, and mechanical properties of PS-HNT membranes were investigated. Introduction of HNTs (5 wt%) into the polystyrene matrix demonstrated excellent thermal and mechanical properties along with good water flux, rejection of unwanted components, recovery, and regeneration cycles. These membranes were overall useful enough to purify real wastewater collected from pulp and paper mill.

Decentralized Neural Network-based Excitation Control of Large-scale Power Systems

Wenxin Liu,Jagannathan Sarangapani,Ganesh K. Venayagamoorthy,Li Liu,Donald C. Wunsch II,Mariesa L. Crow,David A. Cartes 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.5

This paper presents a neural network based decentralized excitation controller design for large-scale power systems. The proposed controller design considers not only the dynamics of generators but also the algebraic constraints of the power flow equations. The control signals are calculated using only local signals. The transient stability and the coordination of the subsystem control activities are guaranteed through rigorous stability analysis. Neural networks in the controller design are used to approximate the unknown/imprecise dynamics of the local power system and the interconnections. All signals in the closed loop system are guaranteed to be uniformly ultimately bounded. To evaluate its performance, the proposed controller design is compared with conventional controllers optimized using particle swarm optimization. Simulations with a three-machine power system under different disturbances demonstrate the effectiveness of the proposed controller design.

The impact of yoga on stress, metabolic parameters, and cognition of Indian adolescents: A cluster randomized controlled trial

Ranjani Harish,Jagannathan Narayanaswamy,Rawal Tina,Vinothkumar Radhakrishnan,Tandon Nikhil,Vidyulatha Jayaram,Mohan Viswanathan,Gupta Yashdeep,Anjana Ranjit Mohan 한국한의학연구원 2023 Integrative Medicine Research Vol.12 No.3

Background: This project aimed to assess the impact of yoga on stress, metabolic parameters and cognition (attention & concentration) in adolescents, aged 13–15 years from public and private schools in two cities (Chennai and New Delhi) in India. Methods: The study recruited 2000 adolescents from 24 schools in a cluster randomized controlled trial design. The yoga group participants underwent 17 yoga sessions, which included: pranayama, basic asanas, meditation and relaxation exercises. Yoga sessions, were held in the school premises once a week. A total of five awareness talks on healthy lifestyle were delivered once a month to the education group. ADOlescence Stress Scale (ADOSS), salivary cortisol, metabolic and clinical parameters and Letter Cancellation Test (LCT) score were measured at baseline and post-intervention (5–6 months). Results: The yoga group showed statistically significant differences in the mean ADOSS score, metabolic parameters, salivary cortisol, and LCT scores compared to the education group. In the intention- to- treat analysis, a significant reduction [5.11, 95% CI (4.78, 5.36), p = 0.001] in ADOSS score was seen in the yoga group compared to education. Conclusion: Implementation of a 17-week standardized yoga program at the school level significantly decreased stress, improved attention and concentration, metabolic and clinical parameters in Indian adolescents.