Thunderstorms are among the most hazardous convective systems in the Indian subcontinent, and their occurrence is particularly frequent over the complex terrain of Northeast India. This study highlights the role of Very High Frequency (VHF) Stratosphere-Troposphere (ST) radar observations from Gauhati University in advancing the understanding of thunderstorm dynamics in Assam. A detailed...
Imperfections in magnetic nanowires can lead to significant changes in their magnetic behavior. Therefore, it is essential to study the effects such defects can have on their magnetic properties. In this work, we perform micromagnetic simulations of magnetic nanowires with artificial defects, and investigate how surface and internal defects influence their hysteresis loops and coercive fields....
Artificial neutron sources are used in many research and industrial fields, and among them, Inertial Electrostatic Confinement (IEC) fusion devices are well known for their small size, flexible operation, and wide range of applications. These devices can produce neutrons in both continuous and pulsed modes, which makes them suitable for future space power systems, making medical isotopes,...
Precision and accurate measurements with neutron beams require a monochromatic, background-free, variable-energy neutron source. Also, the accuracy of absolute normalization of the neutron flux is essential. We are working towards developing a neutron source that meets these criteria. This is also in support of the mandates D1, D3 of the CUPAC-NE Collaboration$^{[1]}$. In particular, IUAC-PAC...
abstract: The Cotton University Particle Accelerator Centre and North East (CUPAC-NE)[1] is developing the first particle accelerator facility in Northeast India, a region with the nation’s highest cancer incidence. This work focuses on Accelerator-Driven Boron Neutron Capture Therapy (AD-BNCT), an emerging cancer treatment based on the $^{10}$B(n,$\alpha$)$^{7}$Li reaction that selectively...
Abstract: Lorentz Invariance Violation (LIV) refers to the breaking of Lorentz symmetry, which ensures that the laws of nature remain identical for all inertial observers. If such violations exist, they could appear as intrinsic effects even in vacuum, independent of external influences. Studying how LIV modifies standard neutrino oscillation probabilities therefore provides a powerful tool to...
Recent results from the Dark Energy Spectroscopic Instrument (DESI) collaboration, based on Baryon Acoustic Oscillation (BAO) measurements, have provided intriguing evidence in favor of dynamical dark energy. In particular, DESI has released a dedicated analysis of dark energy parameterizations by combining their BAO DR2 observations with the Planck 2018 cosmic microwave background data and...
Cd1-xMnxS thin films were successfully deposited onto soda–lime glass substrates via the cost-effective chemical bath deposition (CBD) technique at varying deposition durations. Structural characterization using XRD confirmed the formation of a polycrystalline cubic zinc blende structure. The enhanced intensity of the prominent (111) diffraction peak indicates improved crystallinity....
The direct detection of dark-matter mainly relies on the nuclear recoil energy in detector materials, where only a fraction of the recoil energy contributes to measurable ionization or scintillation signals. This fraction is termed as the quenching factor (QF) and is an essential parameter to reconstruct the nuclear recoil energy accurately. Lindhard's model provides a theoretical framework to...
The eco-friendly biosynthesis of silver nanoparticles (AgNPs) using plant leaf extract offers a cost-effective and sustainable route to value-added nanomaterials using plant metabolites as both reductants and capping agents. In this study, silver nanoparticles were synthesised using a green method that employed the leaf extract of Houttuynia cordata (Mosondori), an indigenous medicinal plant...
Environmental contamination by heavy metals in water and Particulate matter (PM) in air poses severe risk to ecosystems and human health. Heavy Metals such as Arsenic (As), Lead (Pb) and Mercury (Hg) in drinking water are linked to cancers, neurological damage, and developmental disorders, while airborne Particulate Matter especially, PM₂.₅ and PM₁₀ contribute to respiratory and cardiovascular...
In this work, we extend the semiclassical WKB (Wentzel–Kramers–Brillouin) approximation method, previously applied with success to heavy quark–antiquark (meson) systems, to the more challenging and less understood domain of tetraquark states. Tetraquarks, exotic states composed of two quarks and two antiquarks, provide a unique window into the dynamics of multiquark interactions and the...
A theoretical analysis is done to explore the dynamics of nonlinear gravito-electrostatic wave in the molecular clouds. It contains warm lighter electrons, ions and massive positively and negatively charged dust grains. The effects of multi-fluidic viscous drag forces, the gradient forces, naturalistic equilibrium inhomogeneities and nonlinear convective dynamics are also considered. A couple...
Spectroscopic and DFT insights of Ophthalmic Acid
Primary author: Amar Jyoti Saikia*1,2
Co-author: Lakhi Nath Borah3, Bhargab Borah4
Presenter: Amar Jyoti Saikia
Track Classification: Track 03
1 Department of Physics, Dhemaji College, Dhemaji
2 Department of Physics, Madhabdev University
3 Department of Physics, Madhabdev University
4 Department of Physics, DDR College,...
Accurately measuring blood glucose levels without drawing blood remains difficult because glucose has weak optical absorption and biological tissue introduces strong background interference. In this work, we explore whether a compact, low-cost multispectral sensor (SparkFun Triad AS7265x, 410–940 nm) can detect glucose-related optical changes. Sugar solutions ranging from 5–35% w/v were...
Surface-enhanced Raman scattering (SERS) is a highly effective analytical technique for ultrasensitive detection of chemical and biological species. Hybrid plasmonic-semiconductor systems are particularly notable for their reproducibility and multifunctionality. Ag/ZnO/AZO heterostructures achieve enhancement factors (EFs) of about 10⁷ and detection limits as low as 10⁻¹² M [1]. Ag-decorated...
This work presents the methodology and results of calibrating an organic liquid scintillator (EJ-315) [1] for gamma-ray spectroscopy using standard gamma sources, followed by spectral unfolding using a pre-determined detector response matrix using GEANT4 [2]. Energy calibration was performed via identification of known gamma peaks, and their Compton edge positions from Ba-133, Co-60, Na-22,...
A minimal and predictive Majorana neutrino mass matrix texture is proposed. The texture involves four parameters that reveal unique correlations and predict the three neutrino mass eigenvalues, while strictly ruling out the inverted hierarchy. Furthermore, it imposes constraints on the three CP-violating phases. Based on these predictions, we estimate both the effective Majorana neutrino mass...
Secure long-distance communication has become a fundamental requirement in modern information systems, particularly in satellite-based networks where the exchange of sensitive data across vast distances is often exposed to eavesdropping, signal degradation, and transmission errors. Classical communication systems, though widely deployed, face limitations in ensuring unconditional security due...
Abstract: Tunability of the Ne ́el temperatures (TN) in case of antiferromagnetic (AFM) materials has significanct importance in exchange bias studies, magnetic and spintronic device applications etc. Interestingly, AFM transition metal oxide thin films demonstrate TN dependance on film thickness and stoichiometry. This article reports the estimation of TN for AFM nickel oxide (NiO) ultrathin...
We investigate Hawking radiation of spin-1/2 particles from a five-dimensional Myers-Perry black hole with two independent rotation parameters. Using the semiclassical WKB approximation applied to the covariant Dirac equation, we compute the fermionic tunneling probability and recover the standard Hawking temperature at the outer horizon. Extending the analysis to include the inner horizon, we...
The ability to generate and control spin current efficiently is a central challenge for advancing next-generation spintronic technologies. While nonmagnetic materials typically host spin Hall conductivity (SHC) [1] and ferromagnets are studied for anomalous Hall conductivity (AHC) [2], realizing both effects within a single material system remains rare and highly desirable for multifunctional...
Neuron excitation and generation of action potential can be simplified by using the FitzHugh–Nagumo (FHN) model [1]. Such models are not only required for understanding complex neural activity but also to predict and replicate in software and hardware [2]. Hardware emulation is indispensable for building brain computing platforms inspired by brain, medical devices and analyzing real time...
In this work, we investigate the nonlinear structures excited by moving external charged debris in a collisionless, unmagnetized plasma with thermal ions and Cairns-distributed electrons. The results indicate that the interplay between the debris motion and the nonthermal electron population strongly influences the properties of such structures. Our findings provide new insights into...
In the framework of the hybrid type-I + type-II seesaw mechanism, we propose a minimal and predictive texture for the Majorana neutrino mass matrix. The texture contains four free parameters that lead to intriguing correlations and yield several notable predictions, including the exclusion of the inverted hierarchy of neutrino masses, the determination of the octant of the atmospheric mixing...
Abstract: Power Line Communication (PLC) utilizes the available power lines (PLs) for various utilities, such as smart metering, control, Internet of Things (IoT) etc. [1] in places where the implementation of new wires is impossible or costly, and the use of wireless is restricted. However, the cables offer a harsh environment for data transfer characterized by high attenuation, multi-path...
Momentum-Resolved Spin Splitting in 3D Altermagnets: Interplay of Ferromagnetic and Antiferromagnetic orders
Primary author: Rotish Sarkar1
Co-author: Dr. Nimisha Raghuvanshi*1
Presenter: Rotish Sarkar
Track Classification: Track 03
1 Department of Engineering Sciences, Assam Energy Institute (RGIPT), Assam
*Corresponding Author: rotishs23ea@rgipt.ac.in
Abstract: This...
In this work, we treat black holes as bifurcation points and explore their thermodynamic phase structure using the framework of bifurcation theory which is a commonly used method from non- linear dynamics. By constructing an appropriate bifurcating function, we analyze how black holes transition between different thermodynamic phases through changes in the number and stability of fixed points....
Abstract: Atmospheric turbulence significantly influences the dynamics of the surface, lower, and upper troposphere. The refractivity turbulence structure constant (Cn2) serving as a crucial indicator for parameters such as kinetic energy dissipation rate and eddy diffusivity. In this study, continuous wind data from the Stratosphere Troposphere (ST) Radar system of Gauhati University (26.10N,...
Abstract: This paper presents a bio-inspired slotted microstrip patch antenna (MPA) designed as a dual-parameter sensor for monitoring soil moisture and water salinity. The antenna employs a radiating patch patterned with spider-web-like and circular cross-shaped slots, which enhances its sensitivity to variations in the dielectric properties of materials placed in its near field. To enable...
Abstract: The performance of silicon semiconductor based piezoresistive pressure sensors is depends on mechanical properties and electrical properties of the material, structural configuration, and doping concentration. Among different materials, polycrystalline silicon (poly-Si) has gained significant attention due to its compatibility with standard microfabrication processes,...
In this work, we have studied the used of a thin film-based metal-semiconductor junction to improve the optical absorption, scattering and field intensities of the electromagnetic spectrum in the ultra-violate (UV) region. Nanoparticles (Nps) of copper (Cu), silver (Ag) and gold (Au) with size 14nm are individually incorporated on 5nm thick CdS thin film. The finite difference time domain...
Abstract: The sodium-to-potassium (Na+/K+) ratio serves as an important biomarker with relevance to electrolyte balance, renal health, hypertension, and metabolic and inflammatory conditions. Non-invasive body fluids offer practical routes for assessing the Na⁺/K⁺ ratio in point-of-care applications. Traditional methods for measuring Na⁺ and K⁺ such as flame photometry, ion-selective...
X-ray binaries provide a powerful framework for studying accretion processes and compact objects such as neutron stars and black holes. Their flux variability, spanning time scales from milliseconds to years, reflects the complex interplay of mass transfer, disk instabilities, and emission mechanisms. We present a statistical characterization of flux variability using probability distribution...
With the advent of new physics scenarios in the neutrino sector, several models have been introduced to give an indepth view of the texture of the neutrino mass matrix. Here, we attempt to study the neutrino mass matrix considering the left-right symmetric model and its different phenomenological implications in the light of current neutrino oscillation data. The dihedral group D4 and cyclic...
Paper-based electrochemical biosensors are gaining an importance as disposable devices for ion detection in healthcare and environmental applications. Their performance depends on the combined effects of ion transport within the porous paper medium, receptor-ion interactions and electrochemical transduction at the electrode. While experimental studies provide valuable demonstrations, a clear...
In this work, five (05) samples of YBCO have been synthesized via sol-gel
technique. The samples were prepared by varying the concentrations of polyvinylpyrrolidone
(PVP), keeping all other reaction parameters constant. The synthesized samples were then
characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy
Dispersive Analysis of X-rays (EDAX), Transmission...
This study presents a time-delayed analysis of a firefly flash model derived from the bioluminescent mechanism of fireflies[1]. The model is formulated on the basis of the well-established enzymatic reactions responsible for light emission. Numerical findings are validated against experimentally reported results. Additionally, multiple peak pulses at low temperatures, including double peak...
Ag-Au bimetallic nanoparticles deposited on filter paper as a simple SERS substrate for the quantitative analysis of Carbofuran and 2,4-dinitrophenol
Primary author: Nituraj Changmai1,
Co-author: Dipjyoti Sarma2, Pabitra Nath1*
Presenter: Nituraj Changmai
1Department of Physics, Tezpur University
2Faculty of Science, Assam down town University
*Corresponding author:...
A frequency selective surface (FSS) is a thin, repetitive surface designed to reflect, transmit or absorb electromagnetic fields based on the frequency of the incoming radiation and resonant frequency of the elements. By altering the electromagnetic waves that strikes them, the frequency produce dispersive transmitted and/or reflected attributes. The desired characteristics of FSS include a...
We present a comparative analysis of Mellin moments of parton distribution functions (PDFs) using two parametrization strategies, viz. exponential-smooth polynomial weights and generalized polynomial expansions. Both approaches extend beyond the conventional constant-term model, introducing flexibility in modeling quark and gluon dynamics across the momentum fraction domain. Mellin moments are...
The observation of collective phenomena, a hallmark of the quark-gluon plasma (QGP) formed in heavy-ion collisions, in small systems like proton-proton (pp) collisions, remains a topic of intense debate. This study presents the first investigation of radial flow in high-multiplicity (HM) pp collisions using the novel transverse momentum correlation observable, $v_{0}[p_{\rm T}]$. Analogous to...
Assuming that neutrinos are Majorana particles, we have realized two-zero textures using the $\Gamma_{3}$ modular group. The $\Gamma_{3}$ modular group is a finite modular group isomorphic to the $A_{4}$ group. By assigning the matter fields of the model to irreducible representations of $A_{4}$ and choosing appropriate modular weights, we successfully construct two-zero textures of the...
Density Functional Theory (DFT) is used to investigate the optical, electrical and vibrational properties of titanium dioxide nanoparticles (TiO2 NPs) by altering the solvent conditions from DI water to ethanol. From the theoretical calculations, it was observed that their HOMO-LOMO energy gaps are comparable with the experimental results. To study the electronic properties in detail,...
Blue-emitting phosphors hold significant potential for applications in solid-state lighting. We synthesised Y₂O₃ phosphors co-doped with 1 mol% Ce³⁺ and varying concentrations (1, 2, 3, and 4 mol%) of Eu²⁺ using the solution combustion method. Structural, compositional, optical absorption, and emission properties were investigated. X-ray diffraction analysis confirmed the formation of a cubic...
One of the unsolved problems of the Standard Model (SM) is the flavor structure of the fermions. The hierarchy in the mixing angles and masses, both in the quark and lepton sectors, can only be explained by theories beyond the SM. The Froggatt-Nielsen (FN) mechanism is one of the elegant frameworks to explain the flavor structure of quarks and neutrinos. In general, the Froggatt-Neilsen...
Abstract: This study presents the design and simulation of a Multilayer Perceptron (MLP)-based Artificial Neural Network for predicting stages of liver cirrhosis using the Cirrhosis Prediction Dataset from Kaggle. The dataset includes medical and demographic records of 418 individuals, with 20 attributes such as age, sex, treatment type, and clinical conditions (ascites, edema, hepatomegaly),...
Quantum Dots (QDs) are elite class of semiconductor nanoparticles which have potential applications in optoelectronics, photocatalytic activity and biomedical sector as they possess high fluorescent nature as well as high surface-to-volume ratio due to their atom like behaviour [1-3]. Despite having such promising ability, synthesis of these QDs adopting eco-friendly pathway is still a...
We investigate the thermodynamics of asymptotically flat black holes in four-dimensional Einstein-Gauss-Bonnet (4D-EGB) gravity using Rényi entropy as a non-extensive generalization of the Bekenstein-Hawking entropy. The resulting thermodynamic structure, formulated within a restricted phase space-like (RPST-like) framework, reveals a striking resemblance to the thermodynamics of AdS black...
We present a theoretical investigation of back-action noise cancellation in a hybrid optomechanical cavity system, equipped with a quantum well (QW) [1] and supplemented with an optical parametric amplifier (OPA). In conventional optomechanical systems, quantum back-action noise arising from radiation-pressure fluctuations imposes the standard quantum limit (SQL) on force sensitivity [2,3],...
The increasing demand for clean energy has led researchers to find alternatives for efficient energy storage solutions. While lithium-ion batteries (LIBs) are a promising technology, they face problems in terms of safety, availability, environmental impact and cost. Hence, aqueous metal ion batteries such as Na-ion, Zn-ion, Al- ion batteries are being explored. Aqueous Aluminum ion batteries...
Assuming dark matter to be asymmetric as well as self-interacting and neutrinos to be Dirac fermions, we propose a framework to address the observed baryon imbalance of the universe. We add three right-handed neutrinos $\nu_{R_i},\,{i=1,2,3}$, one singlet fermion $\chi$, a doublet fermion $\psi$, and heavy scalar doublets $\eta_i,\,{i=1,2}$ to the Standard Model. Both $\chi$ and $\psi$ are...
Microspectrophotometry (MSP), which integrates microscopic imaging with spectrophotometric analysis, is a powerful technique for concurrent morphological and spectral characterization of samples at the micron scale, supporting critical applications in biological sciences, forensic investigations, and materials research. However, the high cost and operational complexity of conventional MSP...
Kaniadakis Holographic Dark Energy extends the standard holographic dark energy (HDE) model by integrating Kaniadakis entropy, a generalization of the classical Bekenstien-Hawking entropy. Kaniadakis entropy incorporates relativistic statistical mechanics into standard HDE model and is characterized by a deformation parameter K. This study aims to construct a new form of f(R) gravity theory by...
We study a quantum particle confined to a two-dimensional parallelogram with infinite potential walls. By employing a suitable non-orthogonal coordinate system, we derive exact expressions for the energy eigenvalues and eigenfunctions. The results generalize the rectangular case and reveal how skewing the domain modifies both the spectrum and the wave functions.
We investigate the local gravitational instability of self-gravitating, rotating thin astrofluidic disks within the fourth order gravity (FOG) framework [1], [2]. The analysis is performed in the weak-field non-relativistic regime. This consideration is well motivated as the dynamical timescales associated with the disk instabilities are much longer than the relativistic ones. In this regime,...
The nature of dark matter remains one of the most compelling puzzles in modern cosmology and astrophysics. Different observational evidences on galactic and cosmological scales strongly indicate the presence of a non-luminous matter component
in the Universe, the existence of which is still a mystery. In this work, we consider a promising modified framework, the f(R) theory of gravity, as a...
Design of a Compact UWB Microstrip Patch Antenna for Wireless Application
Primary author: Debajit Patir
Track Classification: Track 02
Department of Physics, Silapathar Science College
Dibrugarh University
*debajit.patir@gmail.com
Abstract: In this paper, a novel configuration of microstrip line fed ultra wide band (UWB) patch antenna using a defected ground plane structure...
Electrostatic probes are widely used in various ion sources to measure the plasma parameters. Such probes are cost effective, easy to construct in laboratory and one can easily analyse the current-voltage (I-V) characteristics of the probe to find out the local plasma conditions in an ion source. However, due to unfavourable alterations in plasma conditions, a random fluctuation is often...
Abstract
This study explores at the excimerization of acriflavine dye in ethylene glycol and glycerol solvents. Acriflavine, a member of the acridine dye family, is well-known for its distinctive fluorescence capabilities, which are used in cellular imaging, nucleic acid analysis, and dye laser active media. The study investigates the effect of solvent environment, dye concentration, and pH...
The generation of higher-order optical modes has become an important area of research owing to their unique phase and intensity distributions, which enable advanced applications in optical trapping, high-capacity communication systems, and quantum information processing. Among these, Laguerre–Gaussian (LG) and Hermite–Gaussian (HG) beams represent two fundamental families of structured light,...
Abstract: This study reports the successful hydrothermal synthesis of high-quality 1T´/2H mixed phase molybdenum disulfide (MoS2) three-dimensional (3D) microspheres in a highly alkaline medium under optimized synthesis parameters. MoS2 nanostructures have gained significant interest due to their unique properties and potential applications in electronics, optoelectronics, environmental...
The core objective of this study was to quantitatively determine the shear viscosity and thermal conductivity the key transport properties of strongly coupled dusty plasma when subjected to both ion streaming and an external magnetic field. Using Langevin dynamics simulations, we modeled the complexities introduced by the ion stream (typically from sheath electric fields) and its subsequent...
Nuclear power provides a stable and reliable source of energy that can reduce dependence on fossil fuels. Nuclear power is capable of providing large scale base load electricity. India’s Nuclear programme has led to the development of indigenous technologies and highly skilled manpower. It helps diversify India’s energy mix, reducing vulnerability to international fuel price shocks. In this...
We study the possibility of leptogenesis within the Alternative Left Right Model (ALRM). ALRM is a variant of the Left Right Symmetric Model. Unlike the usual Left Right Symmetric Model, it avoids the flavour changing neutral current. Type-I seesaw generates the majorana mass of the heavy RH neutrino ($\nu_R$), which gives the lepton number violating decay. We find that even for a large value...
We propose a hybrid scotogenic inverse seesaw framework in which the Majorana mass term is generated at the one-loop level through the inclusion of a singlet fermion. This singlet Majorana fermion also serves as a viable thermal relic dark matter candidate due to its limited interactions with other fields. To construct the model, we adopt an
$A_4$ flavour symmetry in a modular framework,...
We present a theoretic investigation to analyze the low-frequency nucleus-acoustic waves excitable in the completely degenerate (CD) cores of ONe (oxygen-neon) and CO (carbon-oxygen) white dwarfs and their nearly degenerate (ND) envelopes. We use a quantum hydrodynamic formalism to model the complex system dynamics comprising of the electronic species, light nuclear species (LNS), and heavy...
Zinc oxide (ZnO) nanoparticles (NPs) were prepared in distilled deionized water by pulsed laser ablation for various ablation durations (5, 10 and 15 mins) and pulse energies (30, 45, 60 mJ/pulse). All the samples possessed characteristic Raman peaks; E2 (low), E2 (high), A1 (TO), A1 (LO) etc. attributed to the wurtzite crystal structure of ZnO [1]. TEM and SAED results revealed nearly...
The ubiquitous development of multiple charged layers and their characteristics has been widely investigated in recent years under varied experimental conditions in hollow cathode discharges due to their wide variety of applications [1], [2]. However, no controlled plasma source could be developed during these earlier studies to investigate the underlying cause of formations of complex charged...
In the present work, breakdown characteristics in air and in Argon gas are studied in a discharge tube. The experiment is performed in a glass tube with two circular electrodes. A dc voltage (~ 300 – 600 V) is applied between the electrodes to create the discharge. The breakdown voltage is measured for different gas pressures at a fixed electrode gap. The Paschen curve is then obtained at...
Abstract: The last few decades have been revolutionary for semiconductor processing and applications due to their extraordinary optical and electronic properties. In this paper, ZnO and PbO nanoparticles are prepared by chemical bath deposition technique. The structural morphologies of the prepared samples are verified with the help of XRD analysis and HRTEM technique. XRD analysis shows the...
