Investigation of GaSb (p+) Pocket doped GaSb/Si Vertical TFETs for High-Frequency Analog Circuits
analog/RF circuit; cutoff frequency and maximum oscillation frequency; GaSb/Si heterojunction; gate capacitance; high-frequency characteristics; output conductance; transconductance; Vertical-TFET
Abstract: This paper reports on the design, modelling, and performance analysis of a GaSb/Si Heterojunction Vertical Tunnel Field-Effect Transistors (HVTFETs), employing band-to-band tunneling (BTBT). The device structure includes a p+-GaSb source and an intrinsic Si-channel/drain, forming a heterojunction that enhances tunneling efficiency due to the staggered band alignment. The obtained ON and OFF currents are 1 105 and 1 1018 A/?m. The saturation drain current (IDSat) rises with gate voltage, measured as: 2.7 108 A for VG = 0.5 V, 3.4 108 A for VG = 0.6 V and 3.9 108 A for VG = 0.7 V. The off-state current (IOFF) is very low (~1019 A) for all the VG values, indicating effective suppression of leakage current. The derived gm values for gate voltages of 0.5, 0.6, and 0.7 V are 5.4 105, 5.5 105, and 5.6 105 S, respectively, indicating effective gate control and transconductive efficiency for signal amplification. The combination of these characteristics would enable high fT and fmax, making the device suitable for broadband and millimeter-wave applications in the radio frequency (RF). The suggested GaSb/Si heterojunction vertical TFET has commendable analog/RF attributes, featuring a peak cutoff frequency (fT) of 8.91 GHz and a maximum oscillation frequency (fmax) of 5.8 GHz. The device demonstrates an intrinsic gain (Av) of 11.2 and a gain-bandwidth product (GBW) of 99.79 GHz, indicating substantial promise for RF front-end applications, including low-noise amplifiers, mixers, and voltage-controlled oscillators, as well as energy harvesting applications. Pleiades Publishing, Ltd. 2026.
Sathishkumar, M.; Geege, A. Sharon; Samuel, T. S. Arun; Anand, I. Vivek; Ramkumar, K.
Restricted Access; Hardcopy may be available in the library
https://doi.org/10.1134/S1063782625603401 https://www.scopus.com/pages/publications/105033787625?origin=resultslist
Sathishkumar M., National Engineering College, K.R. Nagar, Tamilnadu, Kovilpatti, 628503, India; Geege A.S., National Engineering College, K.R. Nagar, Tamilnadu, Kovilpatti, 628503, India; Samuel T.S.A., National Engineering College, K.R. Nagar, Tamilnadu, Kovilpatti, 628503, India; Anand I.V., National Engineering College, K.R. Nagar, Tamilnadu, Kovilpatti, 628503, India; Ramkumar K., Christ University, Bengaluru, Karnataka, 560074, India
Continuum Mechanics Analysis of Surface Vibrations in Piezomagnetic Laminates on Manifold Substrates
heterogeneous half-space; impact analysis; Love-type wave; piezomagnetic materials; semiconductors; viscous liquid
Abstract: This work investigates Love-type wave transmission in a multilayered piezomagnetic (PM) and heterogeneous half-space (HHS) structure with a viscous liquid layer (VL) on top. Wave transmission behavior is investigated in both magnetically open (MO) and magnetically closed (MS) circuit boundary circumstances. The primary study focuses on the scattering behavior of phase velocity in a Love-type wave as influenced by the combination of VL, PM, and HHS. The dispersion relation for Love-type waves was calculated analytically, and phase velocity graphs were displayed and evaluated using Mathematica software. A detailed investigation was undertaken to determine the influence of important variables on phase velocity, such as material heterogeneity, piezomagnetic coupling, and viscous liquid layer thickness. The research results demonstrate the influence of VL, PM, and HHS materials on phase velocity in MO and MS conditions. Graphical comparisons reveal that piezomagnetic coupling causes significant changes in phase velocity, highlighting its role in wave propagation. The open and short circuit conditions exhibited approximately similar phase velocities, suggesting that boundary constraints had a negligible effect on wave propagation. The model only considers linear wave transmission and excludes nonlinear effects. Furthermore, the technique is predicated on idealized material properties that account for heterogeneity. The findings can be used to design and develop energy harvesters, sensors, and wave manipulation instruments using PM with viscous liquid coatings. Understanding the behaviour of surface waves, including phase velocity, is essential for efficient application in these frameworks. Pleiades Publishing, Ltd. 2025.
Acoustical Physics;Volume;71;Issue;4;pp.569-579
https://doi.org/10.1134/S106377102460325X https://www.scopus.com/pages/publications/105022592590?origin=resultslist
Seema, Christ University, Bengaluru, 560029, India; Abhinav Singhal, Christ University, Bengaluru, 560029, India
Analysis of the Viscous Dissipation and Nonlinear Velocity Slip Effect on the Thin Film Nanofluid Flow
Brownian motion; thermophoresis; thin film flow; Thompson and Troian slip; viscous dissipation
Abstract: In the contemporary study, the dynamics of the nanofluid thin film is investigated by considering the viscous dissipation and chemical reaction effects. Additionally, the surface is assumed to have a nonlinear slip rather than the conventional no-slip conditions. This helps in better flow and heat transfer characteristics. This nonlinear velocity slip at the boundary is modelled using the idea proposed by Thompson and Troian. Also, the presence of viscous dissipation in the energy equation, depicts the loss of energy due to the internal friction. Hence, the viscous dissipation turns out to be a critical factor in determining the thermal properties of the nanofluid thin film. The chemical reactions take place within the system because of the presence of nanoparticles, that in turn will have a significant impact on the mass transfer characteristics of the thin film nanofluid. The incorporation of the similarity transformation helps in converting the partial differential equations (PDEs) that govern the fluid flow into a system of nonlinear ordinary differential equations (ODEs). This resulting system is then solved using the BVP package in python whose accuracy is assessed through residual analysis. By this error analysis, convergence of residues was confirmed. Thus validating the method and the results obtained. The outcomes of the study are interpreted through the graphs which highlighted the intensification of heat transfer for the increase in the Eckert number while the magnetic field confirmed its flow controlling feature. Also, the streamlines and contours were plotted to understand and visulaise the flow, all these contours showed the significance of the presence of nonlinear velocity slip at the boundary. Pleiades Publishing, Ltd. 2025.
Kamath, Ananya V.; Puneeth, V.; Katharin, Sini
https://doi.org/10.1134/S1028335825600579 https://www.scopus.com/pages/publications/105024791831?origin=resultslist
Kamath A.V., Department of Mathematics, Christ University, Karnataka, Bengaluru, 560029, India; Puneeth V., Department of Mathematics, Christ University, Karnataka, Bengaluru, 560029, India; Katharin S., Department of Mathematics, Christ University, Karnataka, Bengaluru, 560029, India
Conformal Invariance and Phase Transitions: Implications for Stable Black Hole Horizons?
Abstract: The behavior of black hole horizons under extreme conditionssuch as near collapse or phase transitionsremains less understood, particularly in the context of soft hair and Aretakis instabilities. We show that the breakdown of conformal symmetry during the balding phase induces a topological reorganization of the horizon, leading to divergent entropy corrections and emergent pressure terms. These corrections exhibit universal scaling laws, analogous to quantum phase transitions in condensed matter systems, with extremal limits functioning as quantum critical points. Interestingly, by employing quasi-equilibrium boundary conditions, one could stabilize horizon dynamics without explicitly introducing ad hoc higher-order corrections, further limiting the universal applicability of conformal invariance in black hole physics. Pleiades Publishing, Ltd. 2025.
Gravitation and Cosmology;Volume;31;Issue;3;pp.326-335
https://doi.org/10.1134/S0202289325700203 https://www.scopus.com/pages/publications/105015105564?origin=resultslist
Keshav MV P., Department of Physics and Electronics, Christ University, Bangalore, India; Kenath A., Department of Physics and Electronics, Christ University, Bangalore, India
Exploring Microplastic Pollution in Bellandur and Madiwala Lakes of Bangalore: A Preliminary Study
analytical techniques; diversity; ecology; freshwater; microplastics; pollution
Abstract: Microplastics are plastic debris/fragments measuring less than 5 mm, either produced as such or obtained due to the weathering and fragmentation of bigger plastics. They are an emerging pollutant that have already caused great havoc on aquatic organisms and are a major environmental concern. Microplastics are also found in the human body, but the extent of their harmful effects is not yet fully understood. The sources of microplastic entry into humans include food, water, and air. This study assesses the microplastic occurrence in water and bank sediment of Bellandur (L1) and Madiwala (L2) lakes in Bangalore. The lakes are surrounded by urban areas and are affected by sewage inlet, waste dumping, and commercial boating. The microplastics in the bank sediment and water samples were segregated using the Wet Peroxide Oxidation process. There were no visible microplastics obtainable from the water samples of both lakes. However, microplastics were segregated from the bank sediment of both lakes. The scanning electron micrographs of the microplastics segregated from the bank sediment of L1 were found to be like sheaths and in uneven form and shape. The microplastics retrieved from L2 bank sediment were uneven and sheaths of globular masses when observed using SEM. The EDAX analysis majorly showed the presence of carbon and oxygen in both samples. From the FTIR analysis, the microplastics derived from L1 bank sediment had characteristic peaks of Acrylonitrile Butadiene Styrene (ABS), and Polystyrene (PS). Whereas, the microplastics from L2 had unique peaks corresponding to both Polypropylene (PP), PS and ABS as identified by the absorption peaks pertaining to both CH3 bending (1366 cm1) and aromatic CH (2922 cm1) stretching vibrations. Similarly, in XRD, the 2? values around 20 could be seen in both samples. These peaks correspond to some form of crystallinity, but the microplastics may have degraded due to several factors in the environment leading to changes in their structural form. The SEM, EDAX, FTIR and XRD data confirm the presence of microplastics in both the samples. This is the first reported study of microplastics in these lakes of Bangalore and it implies the need to focus on mitigation strategies for retrieval of microplastics that continues to accumulate in these lakes. Pleiades Publishing, Ltd. 2025.
Water Resources;Volume;52;Issue;2;pp.355-371
https://doi.org/10.1134/S0097807824604977 https://www.scopus.com/pages/publications/105003798763?origin=resultslist
Jaikumar I.M., Department of Life Sciences, CHRIST (Deemed to be University), Dharmaram College, Bengaluru, 560029, India; Tomson M., Department of Life Sciences, CHRIST (Deemed to be University), Dharmaram College, Bengaluru, 560029, India
Spectrometric Analysis of Decrease in Sodium Dodecyl Sulfate (SDS) Concentration by Klebsiella Species Using the Stains-All Dye
anionic surfactant; bacterial biodegradation; detergent-degrading bacteria; SDS degradation; Stains-all, carbocyanine dye
Abstract: Sodium dodecyl sulfate (SDS)-degrading bacteria were isolated from soil and water samples from multiple locations using basal media with 0.05% SDS as the only carbon source. The bacteria were identified using 16S rRNA sequencing and deposited in the NCBI database with specific accession numbers and strain name. There were six bacteria iidentified as Klebsiella variicola MSK86, Klebsiella sp. MSK86, K. quasipneumoniae MSK86, and three K. pneumoniae strains, MSK86, MSK25, and NET12. The potential for decrease in SDS concentration by the bacteria was assessed using Stains-all. The SDS standard graph was plotted with different SDS concentration of 0 to 0.06%. The SDS-Stains-all complex exhibited a peak with maximum absorbance at 440 nm. The absorbance of the bacteria-inoculated samples was monitored at 440 nm on every 24 h until the sixth day of incubation. The decrease in concentration of SDS in the medium on day 6 of incubation by K. pneumoniae MSK86, K. variicola MSK86, and Klebsiella sp. MSK86 was found to be 86, 84, and 84%, respectively. K. pneumoniae NET12 demonstrated 76% of decrease. K. pneumoniae MSK25 and K.quasipneumoniae MSK86 were able to survive in the SDS medium, with decrease of 20 and 40%, respectively. The focus of this investigation was finding bacteria that can breakdown SDS, that may contribute to the decrease in the amount of detergent pollution in water. Pleiades Publishing, Ltd. 2025.
Microbiology (Russian Federation);Volume;94;Issue;1;pp.128-133
https://doi.org/10.1134/S0026261724606419 https://www.scopus.com/pages/publications/85219586966?origin=resultslist
Mittu Koshy, Department of Life Sciences, CHRIST (Deemed To Be University), Bangalore, 560029, India; Biljo V. Joseph, Department of Life Sciences, CHRIST (Deemed To Be University), Bangalore, 560029, India
Rayleigh-Type Surface Waves in Piezo-Thermoelastic Materials: A Comparative Study Using GreenNaghdi III and Three-Phase-Lag Models with Machine-Learning Surrogates
GreenNaghdi III; Machine learning; Piezoelectric thermoelasticity; Rayleigh-type waves; Three-phase-lag model
Abstract: In this work, the GreenNaghdi type III (GN-III) and Three-Phase-Lag (TPL) thermoelastic theories are used to investigate Rayleigh-type surface wave propagation in a transversely isotropic piezo-thermoelastic half-space. Phase velocity, attenuation, and specific loss may be thoroughly evaluated thanks to the derivation of secular equations for electrically open/shorted and thermally insulated/isothermal boundary conditions. The findings indicate that attenuation and loss show a substantial dependency on boundary restrictions and the chosen thermoelastic model, but phase velocity increases with inclination angle and stabilises for high wave numbers. The TPL framework predicts somewhat greater velocities and damping because of thermal relaxation effects, while electrically shorted isothermal surfaces produce the lowest dissipation. By explicitly incorporating governing equations into its loss function, a Physics-Informed Neural Network (PINN) is utilised to overcome the computational burden of solving difficult transcendental equations. The PINN provides an effective stand-in for optimisation and real-time diagnostics in SAW sensors, ultrasonic devices, and smart piezoelectric materials by precisely reconstructing dispersion trends from sparse analytical data. Pleiades Publishing, Ltd. 2025.
Mechanics of Solids;Volume;60;Issue;8;pp.6860-6887
https://doi.org/10.1134/S0025654425604811 https://www.scopus.com/pages/publications/105036522806?origin=resultslist
Seema, Christ University, Bengaluru, 560029, India; Singhal A., Christ University, Bengaluru, 560029, India
Continuum Mechanical Study of Love-Wave Propagation in Fibre-Reinforced Plate Over an Orthotropic Substrate with Interfacial Imperfection
Characteristic impedance; Dispersion relation; Fibre reinforced material; flawed coupling; Multidirectional Material; Q-response; Stress analysis
Abstract: This paper aims to analyse the propagation of Love-type waves in a fibre-reinforced composite (FRC) over a pre-stressed orthotropic substrate. The upper fibre-reinforced layer is imperfectly bonded to the lower orthotropic half-space. The structure considered has a mechanical imperfection (MI). The purpose is to investigate the integrated effect of fibre reinforcement, initial stress, and flawed interface on the dispersion and attenuation of Love-type waves. The dispersion relation is derived analytically using the boundary condition. The phase velocity of the Love-type wave has been discussed in its typical cases: (i) in the infusion of reinforcement and absence of initial stress, (ii) in the presence of reinforcement subjected to initial stress, considering scenarios with and without the flawed coupling. The numerical computation of the analytical finding was performed and plotted using MATLAB, showing the impact of the parameters considered. It is observed that the interfacial imperfection positively influences the phase velocity of the Love-type wave in the model considered. The increase in the reinforcement parameter and the decrease in lead to attenuation in phase velocity. In engineering, fibres are considered to be oriented in two or more directions, and the study assumes only bidirectional fibres. The results highlight the combined influence of mechanical anisotropy, pre-stress, and interface quality on guided wave characteristics, offering valuable insights for the design and optimisation of layered composites, acoustic sensors, and structural health monitoring systems. Pleiades Publishing, Ltd. 2025.
Abhilasha; Singhal, Abhinav; Saeed, Abdulkafi Mohammed; Chaudhary, Anjali
Mechanics of Solids;Volume;60;Issue;8;pp.6823-6840
https://doi.org/10.1134/S0025654425604161 https://www.scopus.com/pages/publications/105037440515?origin=resultslist
Abhilasha, Christ University, Bengaluru, 560029, India; Singhal A., Christ University, Bengaluru, 560029, India; Saeed A.M., Department of Mathematics, College of Science, Qassim University, Buraydah, 51452, Saudi Arabia; Chaudhary A., Department of Management, College of Business Administration, Princess Nourah Bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
Mathematical Modelling of Love-Type Wave Transmission in Magnetostrictive Smart Materials with Imperfect Interface
Heterogeneity; NiFe2O4; Piezomagnetic material; Terfenol-D; Wave controlling
Abstract: The purpose of this study is to investigate the propagation of Love-type surface acoustic waves through two magnetostrictive materials, NiFe2O4 (Nickel Ferrite) and Terfenol-D, embedded in a plate-substrate configuration with an imperfect interface. The study aims to investigate the effect of plate thickness, imperfect parameter, and heterogeneity parameter on both the materials under magnetically open and short scenarios. Methodology: To accomplish this, the study uses a variable-separable approach with the Direct Sturm-Liouville technique along with suitable boundary conditions, to construct frequency relations for both magnetically open and short-circuit conditions. Numerical simulations are carried out to explore the impacts of plate thickness, imperfect parameter, and heterogeneity parameter on Terfenol-D and NiFe2O4 materials under magnetically open and short circumstances. These results have been discussed through graphs that are plotted with the help of Mathematica software. Findings: The results of the study show that the phase velocity increases greater in Terfenol-D than in NiFe2O4, regardless of whether the case is magnetically open or closed. Graphical comparisons clearly demonstrate the impact of width plates, faulty parameters, and heterogeneity parameters on wave propagation characteristics. Research Limitations: The study is limited to linear wave propagation and excludes non-linear effects. Furthermore, the research is based on the attributes of the idealized material and the contact conditions. Practical implications: The findings of this study can help with the design and optimization of sensors, energy harvesters, and wave manipulation devices that use piezomagnetic materials. Understanding the behaviour of surface waves in these structures is critical for their proper use. Originality: This paper provides a complete investigation of surface wave propagation in two types of piezomagnetic composite structures, taking into account heterogeneity and interface circumstances. The comparison of several piezomagnetic models, as well as the addition of heterogeneity and contact circumstances, contribute to the researchs originality. Pleiades Publishing, Ltd. 2025.
Mechanics of Solids;Volume;60;Issue;6;pp.4921-4936
https://doi.org/10.1134/S0025654425600448 https://www.scopus.com/pages/publications/105023873813?origin=resultslist
Dispersion Analysis of Love-Type Waves in a Multilayered Piezomagnetic-Heterogeneous Structure with a Viscous Liquid Layer
Heterogeneity; Love-type waves; Piezomagnetic materials; Semiconductors; Viscous liquid
Abstract: Purpose. This paper examines Love-type wave transmission in a multilayered piezomagnetic (PM) and heterogeneous half-space (HHS) structure with a viscoelastic layer (VL) on top. Wave transmission behaviour is examined in magnetically open (MO) and magnetically closed (MS) circuit boundary conditions. The main study focuses on the dispersion behaviour of phase velocity of a Love-type wave influenced by the combination of VL, PM and HHS. Methods. : The dispersion relation for Love-type waves was determined analytically, and phase velocity graphs were plotted and analysed using numerical simulations with Mathematica software. A comprehensive study was conducted to acquire the effects of significant variables on phase velocity, including material heterogeneity, piezomagnetic coupling, and viscoelastic layer thickness. Findings. : The research results show the attenuation properties of the VL, PM, and HHS materials in MO and MS situations. Graphical comparisons show that piezomagnetic coupling caused the phase velocity curves to alter regularly, indicating its importance in wave propagation. The open and short circuit situations had nearly identical phase velocity, demonstrating that boundary limitations have little effect on how waves propagate. Research limitations. : The model is limited to linear wave transmission and ignores nonlinear effects. Furthermore, the approach is based on idealized material qualities, which account for heterogeneity. Practical Implications. : The studys findings can help build and improve energy harvesters, sensors, and wave manipulation instruments that use PM with viscoelastic coatings. Understanding the behaviour of surface waves is required for effective use in these structures. Novelty. : This article investigates Love-type surface wave transmission in a VL-PM-HHS composite structure that includes a viscoelastic layer, piezomagnetic material, and a heterogeneous half-space. Itexplores how material heterogeneity, piezomagnetic coupling, and viscoelastic attenuation affect phase velocity under magnetic circumstances. Pleiades Publishing, Ltd. 2025.
Mechanics of Solids;Volume;60;Issue;3;pp.2135-2149
https://doi.org/10.1134/S0025654424607158 https://www.scopus.com/pages/publications/105012411738?origin=resultslist
Seema, Christ University, Bengaluru, 560029, India; Singhal A., Christ University, Bengaluru, 560029, India; Bareja U., Department of Mathematics, Mukand Lal National College, Haryana, Yamunanagar, 135001, India
Characteristic Equation Development for Conical Active Solar Still With/Without Photovoltaic Thermal for Sustainable Solution to Clean Water Scarcity: A Comparative Study
clean energy; collector; conical solar still; efficiency; heat transfer; photovoltaics; PVT collector; renewable; renewable energy; solar; solar distillation; sustainability; thermal modeling; thermodynamics; water scarcity
To address global water scarcity and promote sustainable freshwater solutions, a novel solar distillation system has been developed and numerically analyzed. Three cases namely (a) conical solar still (CSS) consisting of partially covered photovoltaic thermal (PVT) flat plate collectors (FPCs), (b) CSS with fully covered PVT-FPCs, and (c) CSS containing FPCs have been considered. Detailed thermal models for different cases have been developed, and the results are compared. An experimental validation of case (a) has been presented. The root mean square percentage deviation for water temperature, condensing cover temperature, and yield is obtained as 5.30%, 4.90%, and 9.11%, respectively. The conical geometry of the proposed system increases the condensing surface area and reduces the shading effect, improving distillation performance. Results show that the maximum collector outlet and basin water temperatures reached approximately 99.8 C and 95.2 C, respectively, at the mass flow rate of 0.04 kg/s and N = 8. Among the configurations, case (c) demonstrated the best performance, achieving a daily distillate yield of 6.44 kg and a maximum instantaneous efficiency of 88.28%. However, case (c) is not self-sustainable. In comparison, cases (a) and (b) recorded yields of 4.70 kg and 3.33 kg and maximum instantaneous efficiency of 79.76% and 25.32%, respectively. The suitability of cases (a) and (b) depends on the requirements of users. Case (a) is suitable when comparatively low electrical output and high yield are required, whereas case (b) is suitable when high electrical output and low yield are required. Copyright 2026 by ASME.
Pal, Narayan Das; Kumar, Nandan; Saxena, Abhishek; Harender; Singh, Desh Bandhu
Journal of Solar Energy Engineering ;Volume;148;Issue;3;Article No.;31004;
American Society of Mechanical Engineers (ASME)
https://doi.org/10.1115/1.4070979 https://www.scopus.com/pages/publications/105031770492?origin=resultslist
Pal N.D., Department of Mechanical Engineering, Graphic Era (Deemed to be University), Uttarakhand, Dehradun, 248002, India; Kumar N., Department of Mechanical Engineering, Shiv Nadar Institution of Eminence, Deemed to be University, Delhi NCR, NH-91, Tehsil Dadri, Gautam Buddha Nagar, Uttar Pradesh, 201314, India; Saxena A., Department of Mechanical Engineering, School of Engineering, Dev Bhoomi Uttarakh and University, Uttarakhand, Dehradun, 248007, India; Harender, Department of Mechanical Engineering, Shiv Nadar Institution of Eminence, Deemed to be University, Delhi NCR, NH-91, Tehsil Dadri, Gautam Buddha Nagar, Uttar Pradesh, 201314, India; Singh D.B., Department of Mechanical Engineering, Graphic Era (Deemed to be University), Uttarakhand, Dehradun, 248002, India, Centre of Energy Research, Graphic Era (Deemed to be University), Uttarakhand, Dehradun, 248002, India
Surface Effects Study: A Continuum Approach from Fundamental Modes to Higher Modes and Topological Polarization in Orthotropic Piezoelectric Materials
electromechanical coupling factor; group velocity; impact; laminates; multiple modes; strain gradient theory; stress analysis; structures; surface effect; vibration; wave controlling; wave propagation
The primary goal of the current work is to investigate how wave propagation influences the performance of surface acoustics wave (SAW) macro-and nano-sensors. Therefore, shear horizontal (SH) waves use the surface piezoelectricity theory to explore SH waves in an orthotropic piezoelectric quasicrystal (PQC) layer overlying an elastic framework (Model I), a piezoelectric substrate, and an orthotropic PQC substrate (model II). This study employs a variable-separable technique. The theoretical forms are constructed and used to present the wavenumber of surface waves in any direction of the piezoelectric medium, based on the differential equations and matrix formulation. In addition, we take into account the surface elasticity theory in order to obtain the phase velocity equation. Two configurations are examined: An orthotropic piezoelectric material layer over an elastic framework and a piezoelectric material half-space with a nanosubstrate. Analytical expressions for frequency equations are derived for both symmetric and antisymmetric waves. This study investigates the effects of surface elastic constants, surface density, anisotropic piezoelectric constant, and symmetric and antisymmetric modes on phase velocity. This study is confined to only linear wave propagation. Additionally, the analysis is based on idealized material properties, surface properties, and characteristic length of the material. Copyright 2024 by ASME.
Journal of Applied Mechanics;Volume;92;Issue;1;Article No.;11008;
https://doi.org/10.1115/1.4067204 https://www.scopus.com/pages/publications/105001234647?origin=resultslist
Seema S., Department of Mathematics, Christ University, Bengaluru, Karnataka, 560029, India; Singhal A., Department of Mathematics, Christ University, Bengaluru, Karnataka, 560029, India
Colonial Migration and Cultural Transformation in India and Burma: Exploring the Role of Transnational Mobility in Shaping Chettinad Heritage
Chettinad; cultural transformation; globalisation; heritage; Indian knowledge systems
Migration has played an important role in the transformation of tangible and intangible cultural heritage across regions, including in the Global South, especially among postcolonial nations, due to their longstanding people-to-people contacts leading to socio-economic and historical-cultural transferences over time. In the case of India, global migratory forces have irreversibly transformed its tangible and intangible sociocultural landscape into a form of syncretism reflected in our civilizational ethos of Vasudhaiva Kutumbakam. In this context, this paper explores the role of international in-/outmigration in historical and contemporary times toward the evolution of India's regional cultural identities using a case of Chettiars' migration from the hinterlands of Chettinad in present-day Tamil Nadu, which is in the south of the Indian subcontinent, to the far-flung nation state of Burma/Myanmar in the northeast, including their subsequent return, primarily during the 19th and the 20th centuries. Using the 3i Framework (Interests, Ideas and Institutions), the study explains the role of cross-border migration in shaping the tangible and intangible heritage of Chettinad, as reflected in its architecture, cuisine and social customs. 2026 Association for the Study of Ethnicity and Nationalism and John Wiley & Sons Ltd.
Kadam, Meghan; Deshpande, Madhumati; Balakrishnan, C.; Ilankumaran, G.; Kunnumpurath, Biju; Thomas, Joby; Paul, Ajith; Suseelan, Anitha; Prakash, Vishnu P.
https://doi.org/10.1111/sena.70053 https://www.scopus.com/pages/publications/105039480840?origin=resultslist
Kadam M., Department of International Studies, Political Science and History, Christ University, Bengaluru, India; Deshpande M., Department of International Studies, Political Science and History, Christ University, Bengaluru, India; Balakrishnan C., Department of Computer Science, Christ University, Bengaluru, India; Ilankumaran G., Alagappa Institute of Management, Alagappa University, Karaikudi, India; Kunnumpurath B., Department of Media Studies, Christ University, Bengaluru, India; Thomas J., School of Business and Management, Christ University, Bengaluru, India; Paul A., Department of Media Studies, Christ University, Bengaluru, India; Suseelan A., School of Architecture, Christ University, Bengaluru, India; Prakash V.P., School of Architecture, Christ University, Bengaluru, India
Role of Globalization and Innovation Pattern in Growth of Bank Credit: Evidence From Emerging and Advanced Asia
Asian economies; domestic bank credit; globalization; innovation
This study examines the role of globalization and innovation pattern (i.e., innovation by the residents and non-residents) in the growth of domestic bank credit across emerging and advanced Asian economies spanning from 1996 to 2022. The bank credit growth model includes economic growth and real interest rate as important control variables. This study employs Cross Sectional-Autoregressive Distributed Lag (CS-ARDL) as an appropriate baseline method because of the cointegration, endogeneity, and cross-sectional dependency present in the data. The long-run results for emerging Asian economies indicate that globalization exhibits a negative impact on banking credit, contrasting with the positive influence observed in advanced Asian economies due to heightened economic growth and increased credit demand. Residential innovation consistently bolsters banking credit in both sets of economies, albeit with mixed effects stemming from non-resident innovation. The long-run results further indicate the positive (negative) impact of economic growth (real interest rate) on bank credit in emerging and advanced Asian economies. These findings are reliable due to the similar results obtained from using Driscoll-Kraay Robust Standard Errors (DKSEs) as robust method. For policymakers in emerging economies, the imperative policy lies in striking a delicate balance between economic openness and bank credit, while counterparts in advanced economies are poised to bolster bank credit accessibility through foreign innovation while upholding stringent regulatory oversight. 2024 John Wiley & Sons Ltd.
Review of Development Economics;Volume;29;Issue;3;pp.1647-1662
https://doi.org/10.1111/rode.13187 https://www.scopus.com/pages/publications/85212970832?origin=resultslist
Pal S., Indian Institute of Plantation Management Bengaluru, Bengaluru, India, School of Business and Management, Christ University Bangalore, Bengaluru, India, Department of Humanities and Social Sciences, Indian Institute of Technology Kharagpur, Kharagpur, India; Mahalik M.K., Department of Humanities and Social Sciences, Indian Institute of Technology Kharagpur, Kharagpur, India
SARIMA-Random Forest Framework for Forecasting Anthracnose Severity in Bottle Gourd Under Variable Transplanting Dates
artificial intelligence; climate-resilient disease management; disease forecasting; epidemiological modelling; machine learning; time series modelling
Anthracnose, caused by Colletotrichum lagenarium, is an economically important disease affecting bottle gourd. This study aimed to evaluate the influence of transplanting time and weather parameters on anthracnose progression and to develop a forecasting framework using statistical and machine-learning models. Field experiments were conducted during the monsoon seasons of 2023 and 2024, with four transplanting dates: 1 June, 15 June, 1 July and 15 July. Disease severity was assessed weekly on leaves and fruits along with concurrent recording of weather data. Correlation and regression analyses revealed minimum temperature as the most influential weather variables, particularly during early transplanting dates. The regression models yielded the highest explanatory power for 1 June fruits (R2 = 0.675), while later transplanting dates showed reduced disease pressure and lower model accuracy. To capture seasonal trends and short-term predictability, Seasonal Autoregressive Integrated Moving Average (SARIMA) models with configuration (1,1,1) (1,1,1) [15] were applied. These models effectively forecasted disease progression, especially for July transplanting with lower mean squared errors (MSE < 200). Time series decomposition showed strong seasonal and trend components in early sowings, while cross-correlation analysis confirmed a 13-week lag between weather triggers and disease expression. This study emphasises the importance of transplanting time in disease development and demonstrates the potential of combining SARIMA and random forest models for developing weather-based early warning systems. These findings contribute to climate-resilient crop protection strategies and can aid in timely decision-making for anthracnose management in bottle gourd and related cucurbits. 2025 British Society for Plant Pathology.
Chittaragi, Amoghavarsha; Patil, Balanagouda; Manjesh, M.; Sridhar, S.; Hurakadli, Manjunath S.; Praveenakumar, R.; Dharamveer, S. Duhan; Kumar, Anil; Kumar, Rakesh; Mohan, Man; Kasniya, Pawan Kumar
Plant Pathology;Volume;75;Issue;1;Article No.;e70093;
https://doi.org/10.1111/ppa.70093 https://www.scopus.com/pages/publications/105021523092?origin=resultslist
Chittaragi A., Department of Plant Pathology, College of Agriculture, Chaudhary Charan Singh Haryana Agricultural University, Haryana, Hisar, India, ICAR-KVK, Chintamani, University of Agricultural Sciences, Karnataka, Bangalore, India; Patil B., Department of Plant Pathology, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Karnataka, Shivamogga, India; Manjesh M., Department of Life Sciences, Christ University, Bengaluru, India; Sridhar S., Centre for Climate Resilient Agriculture, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Karnataka, Shivamogga, India; Hurakadli M.S., Department of Plant Pathology, College of Agriculture, Chaudhary Charan Singh Haryana Agricultural University, Haryana, Hisar, India; Praveenakumar R., ICAR-KVK, Chintamani, University of Agricultural Sciences, Karnataka, Bangalore, India; Dharamveer S.D., Department of Vegetable Sciences, Chaudhary Charan Singh Haryana Agricultural University, Haryana, Hisar, India; Kumar A., Department of Nematology, College of Agriculture, Chaudhary Charan Singh Haryana Agricultural University, Haryana, Hisar, India; Kumar R., Department of Plant Pathology, College of Agriculture, Chaudhary Charan Singh Haryana Agricultural University, Haryana, Hisar, India; Mohan M., Department of Plant Pathology, College of Agriculture, Chaudhary Charan Singh Haryana Agricultural University, Haryana, Hisar, India; Kasniya P.K., Department of Plant Pathology, College of Agriculture, Chaudhary Charan Singh Haryana Agricultural University, Haryana, Hisar, India
Pollination versus carnivory: functional distribution of naphthoquinones in Nepenthes khasiana
Floral nectar; naphthoquinone distribution; nectar chemistry; Nepenthes; pollination; pollinatorprey conflict; toxicity
Nepenthes, a major genus of carnivorous plants, secrete floral and extrafloral nectars (FN and EFN) in their flowers and pitchers, respectively. Recently we demonstrated Nepenthes khasiana EFN as a sugar mix with minimal nitrogenous metabolites and vitamin C. N. khasiana EFN showed insect toxicity due to its strong acetylcholinesterase (AChE) inhibition, and the active principle has been characterized as the naphthoquinone derivative, (+)-isoshinanolone. These findings prompted us to study the chemical composition and toxicity of N. khasiana FN. N. khasiana FN was analyzed for its sugars, amino acids, proteins, fatty acids and vitamin C by HPTLC-densitometry, UFLC, GCMS and biochemical assays. C:N ratio and naphthoquinones were analyzed by CHNS analyzer, headspace-GCMS, and GC-FID, respectively. Toxicity of FN and the naphthoquinone droserone, found in its pitcher fluid, was evaluated using the AChE inhibition assay. N. khasiana FN showed a similar chemical pattern as its EFN, viz., sugar (Glc-Fru-Suc)-mix with minimal amino acids, vitamin C, and moderate protein and fatty acid contents. It showed fairly high C:N ratio. The naphthoquinone, plumbagin, was the major volatile constituent in N. khasiana flowers. Crucially, the AChE inhibitors, (+)-isoshinanolone and plumbagin, were absent in N. khasiana FN, which showed no AChE inhibition. Droserone, however, exhibited strong AChE inhibitory activity. The chemical profiles of EFN and FN reflect a nitrogen-limited metabolism in N. khasiana. Notably, the functional allocation of neurotoxic naphthoquinones abundant in EFN, absent in FN, and present in the pitcher fluid reflects an adaptive strategy that optimizes both nutritional gain through prey capture and reproductive success through pollination. 2026 Wiley-VCH GmbH. Published by John Wiley & Sons Ltd.
Lathika, C.C.; Sujatha, G.B.; Sabulal, N.; Johnson, A.J.; Viswanathan, G.; Remadevi, R.K.S.; Shereefa, L.A.; Baby, S.
Plant Biology;Volume;28;Issue;2;pp.461-467
https://doi.org/10.1111/plb.70146 https://www.scopus.com/pages/publications/105026886695?origin=resultslist
Lathika C.C., Phytochemistry and Phytopharmacology Division, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Kerala, Pacha-Palode, Thiruvananthapuram, India, Department of Botany, Christian College, Kerala, Kattakada, Thiruvananthapuram, India, University of Kerala, Kerala, Kariavattom, Thiruvananthapuram, India; Sujatha G.B., Phytochemistry and Phytopharmacology Division, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Kerala, Pacha-Palode, Thiruvananthapuram, India, University of Kerala, Kerala, Kariavattom, Thiruvananthapuram, India; Sabulal N., Department of Chemistry, Christ University, Karnataka, Bengaluru, India; Johnson A.J., Phytochemistry and Phytopharmacology Division, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Kerala, Pacha-Palode, Thiruvananthapuram, India; Viswanathan G., Phytochemistry and Phytopharmacology Division, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Kerala, Pacha-Palode, Thiruvananthapuram, India; Remadevi R.K.S., Phytochemistry and Phytopharmacology Division, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Kerala, Pacha-Palode, Thiruvananthapuram, India; Shereefa L.A., Department of Botany, Christian College, Kerala, Kattakada, Thiruvananthapuram, India; Baby S., Phytochemistry and Phytopharmacology Division, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Kerala, Pacha-Palode, Thiruvananthapuram, India
Genetics Analysis and Identification of SSR Makers Linked to Downy Mildew Resistance Through BSA in Cucumber (Cucumis sativus L.)
BSA; cucumber; Downy mildew; resistance; SSR marker
The research was carried out to divulge the genetics of inheritance, nature of gene action, correspondingly to identify the SSR markers linked to downy mildew resistance in cucumber. The parents Swarna Agethi and IIHR-438 were used and developed six generations (P1, P2, F1, F2, BC1 and BC2), the parents, filial generations and backcross populations were deployed for genetic studies. The Mendelian segregation suggested that the downy mildew resistance was governed by two pairs of recessive genes with inhibitory recessive epistasis (3 resistant: 13 susceptible) gene interaction. IIHR-438 possessed a higher degree of resistance; and epistatic interaction (additive dominance) was of greater importance than the main effect. Bulk segregant analysis (BSA) aided in identifying the two SSR markers (SSR 35 and SSR 413), which had polymorphism between resistant and susceptible bulk, and the markers among backcross population segregated in an equal (1:1) ratio. Genetic distance between identified markers was found to be 16.6 cM from the QTL IciMapping V3.2 software, which depicted two new quantitative trait loci (QTLs) on chromosome number 3. These findings on genetics of downy mildew resistance provide an implication to advance the reciprocal recurrent selection followed by pedigree selection to aid in the development of resistant varieties in cucumber. 2025 Wiley-VCH GmbH. Published by John Wiley & Sons Ltd.
Bommesh, J.C.; Pitchaimuthu, M.; Manjunathagowda, D.C.; Ravishankar, K.V.; Manjesh, M.
https://doi.org/10.1111/pbr.70058 https://www.scopus.com/pages/publications/105025396959?origin=resultslist
Bommesh J.C., Department of Horticulture, College of Agriculture, V C Farm Mandya, University of Agricultural Sciences, Mandya, Karnataka, Mandya, India; Pitchaimuthu M., Division of Vegetable Crops, ICAR-Indian Institute of Horticultural Research, Karnataka, Bengaluru, India; Manjunathagowda D.C., Division of Vegetable Crops, ICAR-Indian Institute of Horticultural Research, Karnataka, Bengaluru, India; Ravishankar K.V., Division of Basic Sciences, ICAR-Indian Institute of Horticultural Research, Karnataka, Bengaluru, India; Manjesh M., Department of Life Sciences, Christ University, Karnataka, Bengaluru, India
Offering copyright protection for non-fungible tokens in India: Legal frameworks and strategies
block-chain technology; copyright law; economic rights; enforcement rights; non-fungible tokens; ownership
Non-fungible tokens have caused a complete revolution in the digital space regarding how one thinks of unique assets such as pieces of art, music, and digital collectables, and how one trades them. Originating from blockchain technology, NFTs first came into existence in the year 2014 on a platform known as Counterparty. Since then, they have grown as an influential part of the digital economy. NFT is nonfungible, each token is unique and cannot be replaced-which results in unprecedented possibilities and issues in the digital world. However, with the increasing demand for NFTs, several legal issues have emerged particularly in India, where the laws are still underdeveloped. As NFTs are representations of copyrighted works primary issues arising from NFTs are also related to Copyright. Ambiguities with NFTs are misapprehension over ownership, the challenge of managing and licensing NFTs using smart contracts, and the risk of unauthorized minting of copyrighted materials. This paper addresses these critical issues evaluates the current legal status of NFTs in India and explores their intersection with copyright laws. The focus is particularly on buyers' rights, including ownership complexities, the management of rights through licensing and assignments, and the issues around copyright infringement. The research highlights the urgent need for a legal framework for NFTs, delves into the intricacies of NFT ownership, transfers, and licensing, examines the challenges of unauthorized minting and the enforcement of buyers' rights and offers possible solutions. 2025 John Wiley & Sons Ltd.
Journal of World Intellectual Property;Volume;28;Issue;3;pp.830-853
https://doi.org/10.1111/jwip.12356 https://www.scopus.com/pages/publications/105003488518?origin=resultslist
Amith Sriram K.S., Christ University, Bengaluru, India; Valarmathi R., Christ University, Bengaluru, India
Indian Wives of Incarcerated Men Tell Their Own Stories: An Intersectional Narrative Analysis of Disenfranchisement and Resilience
feminism; incarceration; intimate relationships; qualitative methodology; resilience
Objective: Guided by intersectional feminism and symbolic interactionism, the purpose of this study was to document the untold stories of women with incarcerated spouses in India. Background: When a family member is incarcerated, the task of emotionally and financially supporting the family often falls upon women, who are likely to be underresourced and overwhelmed. Women whose husbands are incarcerated in India are likely to possess multiple marginalized identities, increasing their vulnerability to intersecting forms of oppression. Empirical research is lacking on wives of incarcerated men in India, contributing to their invisibility in policy-making and programmatic interventions. Method: In-depth, semi-structured interviews were conducted with 14 wives of prison inmates who resided in or around the capital city of Delhi, all of whom either held a lower caste identity or a Muslim religious identity. Transcribed interviews were analyzed following the steps of narrative analysis. Results: Results illustrate the diversity of storied experiences of wives of incarcerated husbands in India. Participants' narratives represented three types of stories: Ambivalent but Hanging On, Unconditionally Devoted, and Independent and Disillusioned. Four overarching themes characterized women's experiences with spousal incarceration: gendered care work, being stigmatized and sexualized, staying in the marriage, and ceilings of aspiration. Conclusion: This study renders visible women on the margins of Indian society, illustrating how they make meaning of extraordinary life circumstances and persevere through dire hardship. 2025 The Author(s). Journal of Marriage and Family published by Wiley Periodicals LLC on behalf of National Council on Family Relations.
Journal of Marriage and Family;Volume;88;Issue;1;pp.7-22
All Open Access; Hybrid Gold Open Access
https://doi.org/10.1111/jomf.13119 https://www.scopus.com/pages/publications/105004732716?origin=resultslist
Gupta S., Department of Psychology, Christ University, Karnataka, Bangalore, India; Sanner C., Human Development & Family Science, Virginia Tech, Blacksburg, VA, United States
Segregation and researcher's positionality: Challenges of conducting policy ethnography in Southern polarized settings
Researchers conducting policy ethnography in conflict environments are faced with a valuable ethical dilemma is there an ethical standard to determine how a dataset should be pursued in the field? What if the method of pursuing data carries the potential of possibly disrupting one's rapport with the community and being perceived as a partisan ideologically driven researcher with ulterior motives? This question becomes more pronounced in socio-legal, conflict and public policy research in spatially polarized settings of the South. In these settings, knowledge is co-produced through one's own positionality and the nuances of grey areas that do not often feature in aggregated datasets. Scholarship on positionality has questioned whether scholars should explicate their position on the field by pointing towards the intentional or unintentional perpetuation of hierarchies. This paper situates itself in the positionality debate with reference to castelessness in socio-legal research through nine months of ethnographic fieldwork in a Southern spatially polarized setting. It grapples with an emerging contrasting view of whether researchers should at all engage in explicating their positionality. The paper argues that data is a socio-spatial product. It is to suggest that the production of data in conflict settings is informed by the spatial dynamics of social relations that emerge in the co-production of knowledge, and the researcher's reflexive positionality that itself impacts the outcome of data that emerges. 2025 The Author(s). Journal of Law and Society 2025 Cardiff University (CU).
Journal of Law and Society;Volume;52;Issue;S1;pp.S224-S240
https://doi.org/10.1111/jols.12556 https://www.scopus.com/pages/publications/105012894186?origin=resultslist
Shrivastava D., Department of International Studies, Political Science and History, CHRIST (Deemed to be University), Bengaluru, India, Doctoral Scholar, Institute of Public Policy, National Law School of India University, Bengaluru, India