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.
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Recent Submissions
Material Design and Properties of 3D Printable Cementitious Mixtures for Underwater Applications
(2025) Srinivas, Dodda
The rapid advancements in 3D printing technology within the construction industry over the past decade have driven extensive research into the development of sustainable and high-performance cementitious materials. This study explores the potential of such materials, focusing on their printability, mechanical properties, and ecological suitability for applications in underwater environments and artificial reefs. The main objective of this research is two-fold: (1) investigation of the influence of mixture composition including admixtures and fiber on printability and performance of cementitious mortar deposited in air and underwater environments, (2) development of low-pH mortars suitable for artificial reef applications and influence of mixture composition, carbonation curing on printability, mechanical and durability properties.
Techniques for Evaluation of Occupational Safety and Health (OSH) Signage to Ensure Better Comprehensibility
(2024) Chaudhuri, Sangeeta Bhanja
‘Safety first’ is the slogan of every organization to avoid any unwanted Occupational safety and health (OSH) hazards. The purpose of the OSH signs is to grab the attention of people rapidly to objects or situations affecting OSH and to gain a rapid understanding of a specific message. However, they are not always effective in communicating the intended message or necessary information to the employees or ordinary people. The result is that people misinterpret the signs, which may cause disaster and become hazards for them. Literature reveals a need for more study concerning the methods or techniques of sign comprehensibility, which is essential for the proper evaluation of the signs. Hence this necessitated the study of the techniques of comprehensibility of OSH signs.
Experimental Investigation of Solid Flow Pattern in Gas-Solid Circulating Fluidized Bed Riser
(2024) Tribedi, Trilokpati
Circulating fluidized bed (CFB) technology finds extensive applications across various industries, including petrochemical, chemical, fine chemical, metallurgical, and power generation. Its widespread use can be attributed to its exceptional heat and mass transfer capabilities, higher throughput rates, and operational versatility. CFBs are employed in various applications, each tailored to handle different levels of solid fluxes. Low-solid-flux CFBs are instrumental in processes such as drying, alumina calcination, and iron ore reduction. On the other hand, high-solid-flux CFBs are mostly used for fluid catalytic cracking (FCC), making maleic anhydride, burning gasifying coal and biomass, and chemical looping combustion, among other things. Although CFB has been in use for many decades, there is still a lack of fundamental knowledge. CFB is still designed empirically and scaled up based on experience rather than science. The complexity of gas-particle, particle-particle, and particle-wall interactions is primarily to blame for this. Geometry and scale have an impact on these interactions. There is a scarcity of detailed velocity flow field data especially in the case of Geldart Group B particles.
Unsaturated Soil Behavior Under the Combined Influence of Water-absorbing Polymer and Vegetation
(2024) Rattan, Bharat
This study deals with the study on soil-WAP-vegetation-atmosphere interaction under drought or water stress condition and its impact on unsaturated soil behavior. The WAP interaction with soil and external ionic materials (such as fertilizers) significantly affects their water-absorbing capacity and overall performance. Therefore, the combined interaction of WAP- fertilizers and WAP degradation may inhibit the functionality of WAP, which needs to be thoroughly investigated by observing the changes in the SWCC of WAP amended soil. It is well-known that
plant physiological parameters (stomatal conductance (SC) and photosynthetic yield (PY)) undergoes changes during the period of drought stress. However, there is lack of understanding on how these changes (SC and PY) can be linked with the unsaturated soil properties. Therefore, this study investigated the drought stress stages by establishing the relationship between plant's physiological characteristics and soil suction (SS).
Negative and zero Poisson’s ratio cellular metamaterials with enhanced mechanical properties
(2024) Sahariah, Bikram Jyoti
Cellular metamaterials are man-made structures that have unusual mechanical properties. Lattice structures belong to a category of cellular metamaterials formed by periodic arrangement of interconnected struts or plates. With a change in the arrangement of struts, the lattice structures can be made to exhibit positive, negative, or zero Poisson's ratio. In contrast to the extensive research focusing on positive Poisson's ratio lattices, only a few studies focus on enhancing the mechanical properties of lattice structures exhibiting negative Poisson's ratio (NPR) or zero Poisson's ratio (ZPR). These negative or zero Poisson's ratio lattices can find potential applications in different industries, including automobile, defense, aerospace, bio-medical, and sports. This thesis demonstrates different techniques, such as unit cell topology modification, design of dual-phase lattices, and tapered-strut lattices to enhance the mechanical properties of the NPR and ZPR lattices. The NPR lattices made of AlSi10Mg and polyamide 12 (PA12), and the ZPR lattices made of PA12 were fabricated using two different additive manufacturing techniques. Uniaxial compression tests were performed to understand the mechanical behavior of the lattices. The mechanical properties of the metallic lattices were studied under quasi-static and high-strain rate loading conditions, while the mechanical properties of the polymeric lattices were studied under only quasi-static loading conditions. The quasi-static tests were conducted using the universal testing machine, and the high-strain rate tests were conducted using a split Hopkinson pressure bar. Finite element simulations were performed to study the deformation modes and mechanical performance of the lattice structures, which were corroborated by the experiments. The compressive strength, Young's modulus, and energy absorption ability of the proposed NPR and ZPR lattices were compared with the commonly studied NPR or ZPR lattices. Moreover, the effect of unit-cell geometric parameters of the lattices on the mechanical properties was also investigated. This thesis work demonstrated that the conventional composite rule of mixture can predict Young's modulus and Poisson's ratio of the dual-phase lattices. In addition, modifying the existing unit cells by using additional struts or by replacing uniform cross-section struts with tapered struts proved promising to enhance the mechanical properties. Zero Poisson's ratio tubular lattices were also designed, and the effect of unit-cell parameters was studied by the Design of Experiments (DoE) technique with Analysis of Variance (ANOVA). The tubular lattices were optimized for high-energy absorption or high-strength-stiffness applications.