Lakshminath Bezbaroa Central Library Digital Repository
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- This digital archive comprised of the Institutes' intellectual output.
- It manages, preserves & makes available the academic works of faculty and research scholars.
- It is established to facilitate deposit of digital content of scholarly or heritage nature.
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Recent Submissions
Word-Representability of Graphs via Split Decomposition
(2026) Dwary, Tithi
The theory of word-representable graphs lies at the intersection of graph theory and combinatorics on words. This thesis uses a graph decomposition technique, viz., split decomposition, to study the theory of word representable graphs. Further, the thesis constructs minimum-word-representants for certain classes of graphs.
Enzymatic and Non-Enzymatic Aspects of Sensor Design
(2026) Das, Sheetal
Biosensors have emerged as powerful analytical tools for the rapid and sensitive detection of biomolecules, with gold nanoparticles (AuNPs) playing a crucial role due to their unique optical properties, high surface area, and excellent biocompatibility. This thesis focuses on understanding biomolecular interactions at gold nanoparticle interfaces through a combination of experimental investigations and molecular simulations to support the development of efficient biosensing platforms. The first part of the study investigates the adsorption behavior of the enzyme allantoinase, identifying the structural and spatial factors that influence protein adsorption. Computational analyses provided molecular-level insights into protein orientation, surface accessibility, and adsorption characteristics, contributing to a better understanding of enzyme–surface interactions.The second part examines the functionalization of citratestabilized AuNPs using two thiol-based crosslinkers, 3,3′-dithiobis(sulfosuccinimidyl propionate) (DTSSP) and dithiobis(succinimidyl propionate) (DSP). Successful surface modification was confirmed through UV–Visible spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy. Adsorption isotherm models were employed to evaluate linker adsorption behavior and determine the thermodynamic parameters governing the interaction. Molecular dynamics simulations, including binding free energy, radial distribution function, mean residence time, and mean square displacement analyses, provided atomistic insights that complemented the experimental observations. Overall, the findings demonstrate that linker chemistry significantly influences nanoparticle surface functionalization and adsorption behavior. By integrating experimental characterization with computational modelling, this work advances the understanding of AuNP-based biointerfaces and provides a foundation for the rational design of stable and sensitive nanomaterial-based biosensing systems.
First Sterile Neutrino Search at NOvA Experiment Using both Neutrino and Anti-Neutrino Data
(2026) Shivam
Neutrinos are among the most abundant fundamental particles in the universe, and yet they are so elusive that they pass through almost everything without leaving a trace. For decades, researchers have measured neutrino oscillations in great detail, refining our understanding of the theories. Yet, once again, neutrino shows their incredibly surprising nature through some recent experimental results, suggesting that our current understanding might be incomplete. Several experiments have observed an unexpected difference in the observed neutrino behaviour from what the Standard Model predicts, showing an excess in some cases (e.g. LSND, MiniBooNE) and a deficit of neutrino events in others (e.g. SAGE, GALLEX). These anomalies challenge our conventional theories of standard three neutrino flavors and phenomenologically motivate the sterile neutrino hypothesis, which does not interact through the usual weak force. While some results appear consistent with this idea, others have found no supporting evidence (e.g. MicroBooNE), leaving the question unanswered. NOvA is one such long-baseline neutrino experiment with its Near Detector (ND) at Fermilab and a Far Detector (FD) at 810 km in Minnesota. It uses the NuMI beam as its primary source of neutrinos for oscillation studies. Its two-detector setup, extended baseline, and ability to conduct combined $\nu$-$\bar\nu$ analyses position it to explore these phenomena in new ways.
Quantum Noise Cancellation beyond the Standard Quantum Limit in Hybrid Optomechanical Systems
(2026) Roy, Alolika
Cavity optomechanical systems have established themselves as powerful platforms for high precision measurements of weak forces, displacements, and fields, with prominent applications in gravitational wave detection, quantum metrology, nanoscale sensing, and emerging quantum technologies. In these systems, the interaction between an optical cavity field and a mechanical oscillator enables the transduction of minute mechanical motion into measurable optical signals. Despite remarkable experimental and theoretical progress, the ultimate sensitivity of optomechanical measurements is fundamentally constrained by quantum measurement noise. Overcoming the Standard Quantum Limit (SQL) represents a long-standing challenge in precision measurement and has motivated extensive research into finding effective strategies. In this thesis, we have come up with a set of experimentally feasible schemes to beat the SQL. Our schemes are primarily based on the so-called coherent quantum noise cancellation technique. The main contributions of this thesis lie in demonstrating that coherent quantum noise cancellation can be systematically realized across a broad class of hybrid optomechanical systems, leading to complete elimination of radiation-pressure back-action and force sensitivities beyond the Standard Quantum Limit.
Development of Novel Bio-composite Phase Change Material for Passive Design Interventions in Rural Households for Thermal Management
(2026) Bordoloi, Urbashi
The continuously increasing demand for high-quality energy for space cooling, coupled with the associated environmental emissions, necessitates the development and adoption of alternative and sustainable solutions. The present study focuses on developing an affordable material for building envelopes to passively reduce the energy demand for space cooling in hot and humid climates. Porous biochar for providing shape stability to organic PCM (OM35) has been systematically explored by using three abundant biomasses. Sugarcane bagasse (SCB), water hyacinth (WH), yellow oleander (YO), and their binary and ternary blends have been pyrolyzed at a temperature of 550°C to produce biochar. The biochar has been mixed with OM35 through simple impregnation method for the preparation of seven different form-stable biocomposite PCMs. In addition to exhibiting substantially enhanced leakage resistance relative to pure OM35, the WH-PCM demonstrates a marked improvement in thermal transport properties, with its thermal conductivity increased by 50.5 %. A controlled study in a developed thermal chamber demonstrates that the WH-PCM-impregnated brick achieves a maximum temperature difference of 7.98°C across its thickness compared to an identical red clay brick. Following the preliminary results, a (1m × 1m) wall section has been constructed using clay bricks incorporated with WH-PCM. The optimum results in terms of reduction in inside wall temperature and heat flux are found in the west direction when the WH-PCM layer is applied in the middle of the wall thickness. The maximum peak temperature reduction is found to be 4.66°C compared to the control wall, and the average reduction in daily heat flux is found to be 76%. WH-PCM-enhanced walls are beneficial in reducing the overall room temperature during peak summer hours, with a maximum temperature difference of 6°C compared to a reference room of identical dimensions. Based on directional analysis, the application of WH-PCM is recommended for the west and south walls for that particular climate.Techno-economic results showed that with WH-PCM integration, the annual cooling energy load has decreased by 31.5%. PCM intervention in walls results in an approximate 30% reduction in global warming potential. The present study provides a comprehensive analysis and techno-economic comparison, offering critical insights into the optimal preparation of biochar-based PCMs and their cost-effective application in rural housing, as well as the most effective placement and orientation of PCM layers within brick walls to achieve indoor temperature reduction in hot and humid climates.