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
Fabrication and Testing of PVDF Based Peng Devices for IoT Applications
(2024) Kulkarni, Nikhil Dilip
Increasing environmental pollution and battery durability have redirected energy research toward eco-friendly renewable technologies. There is a pressing need to create energy conversion and power supply devices that are both high-performing and sustainable due to the rapid development of wearable electronics and the Internet of Things (IoT). The rapid development of polymer based flexible piezoelectric sensors have attracted considerable attention due to their promising applications in nanogenerators. PVDF thin films have a wide prospect in energy harvesting applications due to flexible design and presence of electroactive phase. Despite massive work in this domain, commercial applications are very rare since PVDF based thin films have low piezo response. Composite film samples are fabricated using DMF as a solvent through low cost solvent casting approach. This research work focuses on the fabrication and testing of flexible PENG devices made up of PVDF-based composites with enhanced mechanical, dielectric, and piezoelectric response for energy scavenging purposes. PVDF-TiO2 composite films are fabricated to assess their piezoelectric performance for energy scavenging. Effect of varying rGO content on energy scavenging capacity of PVDF-TiO2 composite films is then studied. Further, the MCDM-based TODIM technique is used to select the best piezoelectric material from the samples available. Role of reinforcement of rGO in PVDF-BTO composites for enhanced mechanical and piezoelectric performance is then studied. Further, naturally available bio-compatible filler materials are explored to develop sustainable piezoelectric energy harvesters. PVDF composites based on treated BMP are tested for their suitability as impact sensor under a variety of impact loading conditions. After that, PVDF-FS based bio based energy scavenging device interacting with human body parts to monitor real-time physiological signals is developed. The surface morphology, beta phase fraction, thermal stability, mechanical behaviour, and dielectric response of all the nanocomposite structures are examined. Conductive electrodes are deposited on the top and bottom surfaces of fabricated composite films to create a PENG device. The device is then put through a series of bio-mechanical operations, including tapping, thumb pressing, film twisting, and bending, to measure piezo response.These kind of flexible piezo devices prove to be ideal for mechanical energy harvesters used in sensing applications due to their excellent overall properties and good cost-performance balance.
Development of activated carbon-supported bimetallic catalysts and microreactors for the production of lactic acid, 2,5-furandicarboxylic acid, and 5-hydroxymethylfurfural
(2024) Pemmana, Hanumanth Reddy
Essential biomass-derived platform chemicals such as lactic acid, 5-hydroxymethylfurfural (HMF), and 2,5-furandicarboxylic acid (FDCA) hold significant potential in the polymer and fine chemical industries. This study focuses on catalytic transformations: glycerol to lactic acid and HMF to FDCA, employing activated carbon-supported bimetallic catalytic systems, and fructose to HMF, using homogeneous catalysts in helical coiled reactors.
Stability and Error Analysis of Numerical Schemes for 1D and 2D Fractional Differential Equations
(2024) Seal, Aniruddha
"The aim of this thesis is to construct and analyze some simple, yet very efficient numerical
methods to approximate solutions to fractional differential equations (FDEs) which
find wide-ranging applications across numerous fields. From understanding fluid dynamics
in engineering to modeling chemical reactions in chemistry, and from analyzing electrical
networks in physics to optimizing control systems in robotics, these mathematical models
underpin crucial aspects of modern technology and scientific inquiry. In FDEs, weakly singular
kernels play a significant role. These kernels have singularities that are milder compared
to classical calculus. Since most FDEs lack analytical solutions, we look towards different
numerical methods as the optional way. However, when dealing with FDEs with weakly singular
kernels, standard numerical techniques may not suffice, and thus specialized techniques
are needed to ensure accurate and efficient computations. The non-uniform mesh generation
strategies help us to get rid of this issue of singularities by distributing a sufficient number
of mesh points near the singular point."
Guidelines For Craftspeople’s Bamboo Products To Meet United Nation’s Sustainable Development Goals 2030
(2024) Das, Monikuntala
"Bamboo is becoming a significant material in the Indian market due to its eco-friendly properties and versatile
applications in construction, automobiles, furniture, and interior design. Its mechanical strength, easy processability,
and widespread availability in tropical and subtropical regions make it a renewable resource ideal for product and
furniture design. As a non-timber product with a short replenishment time, bamboo addresses concerns over
depleting natural resources"
Single and Co-Feed Pyrolysis of Erythrina Indica and Azadirachta Indica: Analysis of Products, Kinetics and Thermodynamics
(2024) Ahmed, Gaffer
Growing concerns over fossil fuel utilization and their impending scarcity have spurred a transition towards renewable energy sources. Biomass has gained remarkable traction due to its widespread availability and adaptability. Pyrolysis, amid various biomass conversion routes, boasts advantages like moderate operating conditions, facile handling and efficient product distribution. However, commercialization faces hurdles due to the large fraction of non-fuel phase in pyrolytic bio-oil. This thesis focusses on the fuel phase extraction of bio-oil obtained from pyrolytic conversion of Erythrina indica (EI) and Azadirachta indica (AI) biomass using dichloromethane and n-hexane at four vol.% (10, 20, 30 and 40%) of solvent relative to the volume of pyrolytic raw bio-oil. Average yields of bio-oil, biochar and non-condensable gases from EI biomass pyrolysis were 26.873 wt.%, 42.870 wt.% and 30.257 wt.%, respectively; for AI biomass, the values were 27.286 wt.%, 41.053 wt.% and 31.662 wt.%. n-hexane proved superior for isolating fuel phases, showing improved properties in terms of density, viscosity and calorific value compared to dichloromethane and without using any solvent for separating the fuel phases. Fuel phases extracted using 30 vol.% and 40 vol.% n-hexane depicted properties similar to conventional gasoline. The average calorific values of biochar from EI and AI biomass were 28.030 MJ/kg and 28.500 MJ/kg, respectively, and for non-condensable gases, the respective values were 14.486 MJ/Nm³ and 14.882 MJ/Nm³. EI and AI biochar exhibited physiochemical properties, flowability and combustion indices comparable to conventional coal. In the non-condensable gases obtained from EI and AI biomass pyrolysis, approximately 50-65% (by volume) of the gases were constituted by combustible gases including H2, CO and CH4. Co-feed pyrolysis of EI and AI biomass yielded bio-oil, biochar and non-condensable gases in the range of 29.512-32.399 wt.%, 38.249-42.480 wt.% and 26.901-30.730 wt.%, respectively. The 1:1 co-feed ratio showed optimal outcomes, with a maximum calorific value of 36.798 MJ/kg for the fuel phase (extracted using 10 vol.% of n-hexane) and 29.233 MJ/kg for biochar and 13.761 MJ/Nm3 for non-condensable gases. Economic analysis for setting a 10-ton batch-type pyrolysis plant indicated viable projects with positive net present values by the end of the project. Payback periods were 3.90 years for EI, 6.46 years for AI and 4.05 years for their 1:1 co-feed ratio.