Lakshminath Bezbaroa Central Library Digital Repository
Welcome to the Institutional Digital Repository of Lakshminath Bezbaroa Central Library.
- 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.
- Allowing academics & their departments to share & preserve contents in a managed environment.
Communities in Gyan-IR
Select a community to browse its collections.
Recent Submissions
Performance Analysis and Interference Management in Underlay D2D Cellular Networks
(2024) Tsegay, Mahari Berhe
With the advancement in technology, the demand for wireless data is growing explosively over years. The unprecedented rise in demand for higher data rates is attributed to factors such as an increase in the number of mobile applications, alarming growth in bandwidth-needy applications like video streaming, and the use of multiple devices by the same user. This has resulted in a push for an investigation of new architecture and technologies to satisfy the ever increasing demands and requirements of the wireless networks. Data-based applications have gained immense popularity as a necessity in our day-to-day life. In order to connect the growing number of wireless devices, resources are reused in the cellular system. In the traditional cellular wireless network, the cellular user equipment (UE) communicates its data to the base station (BS) using uplink (UL) network resources. Similarly, the data at the BS is communicated to the cellular UE on employing downlink (DL) network resources. However, if the transmitting and receiving UEs are in close proximity to one another, the BS can allow with control/limited control the UEs to directly communicate with each other. This direct communication mode between the transmitting and receiving UEs is referred as the device-to-device (D2D) communications. The introduction of D2D communication in cellular wireless networks provides advantage in terms of proximity gain at crowded arenas like shopping places, carnivals and festivals, and office buildings. Thus, transmission is achieved with high data rate, lesser delays, and less power consumption. In underlaying D2D mode, the cellular resources are reused by D2D links and achieve a reuse gain as one of the advantages of D2D communications. D2D communication underlying cellular network offers an advantage in terms of improved spectral efficiency but at the cost of increase in interference due to sharing of resour. The main challenge in allowing links using the same resources for the cellular DL or UL transmissions is the mutual interference between the D2D and cellular links. In order to manage the mutual interference an interference cancellation (IC) strategy is presented which considers orthogonal precoding vectors for links sharing the same resources. This IC strategy improves the outage probability and the overall capacity of cellular and D2D UEs sharing the same resources.
Multiparametric Water Quality Sensor: Characterization, Calibration, and Calibration Transfer
(2024) Vignesh, Balakumara M
This thesis focuses on developing a multiparametric water quality sensor using Carbon Nanotubes (CNT)-based ink to measure parameters like active chlorine and pH, along with sensors to measure conductivity, and temperature. Developed under the Indo-EU Horizon 2020 project LOTUS, the sensor integrates a CNT ink-based head, an Analog Front End (AFE), and communication for real-time monitoring. A bypass structure protects the sensor from suspended solids and ensures controlled water flow, facilitating easy maintenance and installation. The sensor was tested across various scales, from lab experiments to water loops, leading to the development of a plastic version to meet the Indian market's needs (affordability, reliability and longevity). However, we faced challenges in ink deposition and delay in sensor desorption, causing performance issues. Nonetheless, the preliminary results suggest the sensor's potential for affordable, real-time and continuous monitoring in field conditions, with lifecycle testing indicating sustained functionality for over five months. Future efforts will focus on enhancing fabrication processes and developing robust models to address these challenges. Overall, this thesis successfully developed and designed an optimized framework and a lab-tested prototype for a low-cost multiparametric water quality sensor tailored for the Indian market.
Individual and collective dynamics of excitable chemical waves: Chaos and Drift, Synchronization and Chimera
(2024) Khan, Parvej
Self-organization and the dynamics of rotating spiral waves have captured the interest of numerous researchers within the realm of nonlinear dynamics over recent decades. Various biological systems, such as the human heart and chicken retina, exhibit the presence of spiral waves.
Mechanistic Insights into the Role of Sulfur Ligation in the Oxidative Reactivity of Non-heme High-valent Iron Complexes
(2024) Satpathy, Jagnyesh Kumar
This thesis investigates the generation, characterization, and reactivity of various sulfur-ligated high-valent non-heme iron intermediates. Specifically, it focuses on the chemistry of non-heme iron(IV)-oxo, iron(IV)-tosylimido, and iron(III)-alkylperoxo systems. Chapter III demonstrates the significant impact of substituting a sulfur ligand for an N-CH3 group on the reactivity of the iron(IV)-oxo species. Chapter IV details the creation of a sulfur-ligated iron(IV)-tosylimido complex and compares its properties with those of the iron(IV)-oxo analogue. Chapter V presents the generation of a sulfur-ligated iron(III)-alkylperoxo species and introduces a novel mechanism for its reaction with aldehydes.
Newer Synthetic Strategies for Novel Polyheteroaromatic (PHA) Compounds and Some of Their Photophysical Studies
(2024) Yashmin, Sabina
The contents of the thesis have been organized into five chapters based on the experimental works, observations and literature survey. Chapter I comprises an introductory discussion about the importance and synthetic methodologies of Polyheteroaromatic compounds (PHAs). The domino and multicomponent reactions are particularly superior to other multi-step syntheses of PHAs due to their remarkable, efficiency and selectivity, involving at least two consecutive reactions within a single step generating lesser number of by-products without the need for isolating intermediates or introducing new reagents. This thesis documents the synthesis of tricyclic, tetracyclic and hexacyclic heteroaromatics through the strategic application of the Domino and Multicomponent reactions. Chapter II describes the preparation of 2-(7,8,9,10-tetrahydrobenzo[c]phenanthridin-6-yl)phenol derivatives as a precursor from the multicomponent reaction of 1-naphthylamine, salicylaldehyde and cyclohexanones. Then, the synthesis of benzo[c]chromeno[4,3,2-gh]phenanthridine derivatives is accomplished using the precursor in a one-step cascade reaction. This includes a consecutive series of reactions such as the formation of o-quinone methide intermediate, 6pe ring closure reaction, hydroxylation, and H2O elimination reactions for the aromatization. Chapter III illustrates the synthesis of 7-bromobenzo[c]chromeno[4,3,2-gh]phenanthridine from the tandem reaction of the same phenolic precursors with a regioselective instalment of the bromo group. This methodology showcases the involvement of radical catalyzed di-bromination, pyran ring formation by intramolecular substitution, and aromatization reactions in a step employing NBS/AIBN. Chapter IV delves into the synthesis of 6-aryl-8,9-dihydro-benzo[c]phenanthridine-10(7H)-ones by using solvent-dependent multicomponent reaction of 1-naphthylamine, salicylaldehyde and cyclohexanones. This methodology flaunts imine formation, adding imine and cyclohexanone, cyclization followed by regioselective benzylic oxygenation using DMSO as a solvent-cum-reactant. Finally, 6-aryl benzo[c]phenanthridin-10-ol derivatives are obtained from the ketone precursor. Chapter V consists of the pseudo-multicomponent reaction of aryl amine (mainly 1-naphthylamine, 2-naphthylamine, 2-aminoanthracene), aryl aldehyde and solvent-cum-reactant dimethyl sulfoxide (DMSO). Herein, DMSO is used as a -CH=C-CH3 synthon. The thesis also demonstrates the brief AIE study of a 7-bromobenzo[c]chromeno[4,3,2-gh]phenanthridine compound and fluoride sensing study of few 6-(2-hydroxyaryl)-8,9-dihydro-benzo[c]phenanthridine-10(7H)-one derivative.