IMU Institutional Digital Repository
Welcome to the Institutional Digital Repository of IMU. The Central Library of IMU maintains this repository and provides metadata and full-text files of all the IMU Publications. The repository aims to preserve and disseminate access to IMU publications, including Articles, Working Papers, Books, Book Chapters, Project Reports, and more authored by Faculty, Experts, Research Scholars, and Students enrolled in IMU. For access to the repository or any clarifications, do not hesitate to get in touch with the Central Library at:repository@imu.ac.in
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Linking personality traits with perceived augmented stress with mediation of interpersonal relationship behaviours: an explorative study on indian marine engineers
(Indian Maritime University, 2024-06) Mitra, Toorban
Human resources are considered invaluable to any business organisation, especially when such resources are equipped with a blend of techno-human skills and at the same time, scarce in nature. While human resources can be of extreme potential, at the same time, such a resource can be prone to experiencing psychological stress at times. Such a situation is not uncommon nowadays in many business organisations due to rapid technological development, competitive business environment, multiple job roles, etc. Worth mentioning here is that the concept of stress is relative in nature. While some individuals perceive a situation as significantly stressful, others may not. Scientific pieces of evidence establish that such a difference exists among others due to differences in personality as well as preferences towards building interpersonal relationships. However, different mediating factors may soothe such linkage between personality traits and stress. For instance, support from peers is a significant way of reducing stress, particularly while working in a team environment. This is more so under uncertain situations like COVID-19, which demand a collaboratively competitive teamwork environment. The present study tries to test such linkage between personality traits and augmented occupational stress and the mediating impact of interpersonal relationships of an employee on such linkage during COVID-19. The Indian marine engineers are taken as a case study to understand such dynamics.
THERMOHYDRAULICS OF TURBULENT FLOW THROUGH SQUARE AND RECTANGULAR DUCTS WITH TRANSVERSE RIBS AND TWISTED TAPES WITH AND WITHOUT OBLIQUE TEETH
(Journal of Enhanced Heat Transfer, 2022-06-22) Sujoy Saha
Thermal and friction characteristics of turbulent flow through square and rectangular ducts with periodic transverse ribs and different types of twisted tapes with and without oblique teeth have been studied experimentally. Circular ducts have also been used. Correlations for predicting the friction factor and the Nusselt number have been developed and performance has been evaluated. Although both the friction factor and the Nusselt number are higher for all types of twisted tapes with oblique teeth in combination with transverse ribs, the performance evaluation has shown that the ducts with transverse ribs and regularly spaced twisted-tape elements with oblique teeth are better than those in the case without oblique teeth and this is recommended. Also, since the pressure drop in a heat exchanger is a small fraction of the total system pressure drop, the heat transfer being higher, full-length and short-length twisted tapes with oblique teeth in combination with transverse ribs can be recommended since the heat exchanging surface area requirement will be less.
The investigation on stability and physicochemical properties of multi ferrites nanoparticles dispersed Tamarindus indica biodiesel
(International Journal of Thermofluids | Elsevier, 2025-02-28) Jaikumar Sagari
This study aims to investigate the stability and physicochemical properties of nickel and manganese doped bismuth ferrite nanoparticles (BNiFMO) in a Tamarindus indica biodiesel. The BNiFMO nanoparticles were evaluated at concentrations of 50 mg/L and 75 mg/L. In addition, the BNiFMO nanoparticles were supplemented with dispersants (Tritonx and QPAN) at different ratios, namely 1:0.25, 1:0.5, 1:0.75 and 1:1, respectively. The stability study was carried out using the principle of photo spectroscopy at three different time intervals: Week 1, 2 and 3. The stability was evaluated by transmittance and absorbance. In addition, the physicochemical properties were evaluated according to ASTM standards. The transmittance of BNiFMO nanofuel spiked with Tritonx and QPAN80 was lower compared to the base nanofuel, while the absorbance increased, indicating better stability. At lower ratios of nanoparticles and Tritonx/QPAN, stability decreased, but better stability was achieved at a 1:1 ratio. The QPAN-based nanofuel was found to be more stable overall than the base nanofuel and the Tritonx-based nanofuel. The lower transmittance and higher absorbance were noticed with B20 +BNiFMO75 mg/L +QPAN 75 mg/L, while the stability decreased slightly with increasing duration. The minimum transmittance and higher absorbance values recorded were 87.75 % and 4.42 in week 1, 89.93 % and 4.23 in week 2, and 91.21 % and 4.18 in week 3. Finally, the addition of Tritonx and QPAN to BNiFMO nanofuel led to an increase in calorific value and cetane number. The highest calorific value and cetane number recorded were 41.456
MJ/kg and 64, respectively, for the B20 +BNiFMO 75 mg/L +QPAN 75 mg/L blend. However, the kinematic viscosity and density exhibited somewhat inconsistent trends.
Exploring the necessary upgrades in port infrastructure to accommodate and support the operation of the next‑generation green ships
(Marine Systems & Ocean Technology | Springer, 2025-04-14) Abhijit Arvind Mohite, Emil Mathew
The transition to green shipping is critical for addressing the maritime industry’s environmental challenges amid rising concerns about climate change and pollution. Green ships utilize alternative fuels and innovative technologies to reduce their carbon footprint, necessitating substantial upgrades to port infrastructure. This study employs a positivist approach, using a quantitative research methodology to analyze the financial, technological, and environmental requirements for accommodating these vessels. A descriptive research design, coupled with stratified random sampling, captures stakeholder perceptions from diverse groups, including industry experts and port authority officials, through a Likert-scale questionnaire. The findings reveal strong consensus on the urgent need for improvements in docking facilities, modern fuel supply systems, and waste management, indicating financial and technological challenges. Stakeholders largely believe that adequate financial resources exist for these upgrades, emphasizing the importance of government funding and private investment. There is a general agreement that upgrading infrastructure will decrease carbon emissions, while calls for stricter regulatory enforcement and legal incentives persist. Overall, this research underscores the readiness of ports to accommodate green ships and highlights the potential for aligning investments with global sustainability goals. The originality of this study lies in its comprehensive analysis of stakeholder perceptions and the integration of multiple dimensions—financial, legal, environmental, and technical—in evaluating port infrastructure upgrades for green shipping.
PHOTOVOLTAIC-FED MOTOR DRIVE SYSTEM FOR NEXT-GENERATION ELECTRIC VEHICLES
(INTERNATIONAL JOURNAL OF ADVANCES IN SIGNAL AND IMAGE SCIENCES, 2025-06-30) S Thangalakshmi
The growing demand for zero-emission, environmentally friendly Electric Vehicles (EVs) is driven by both current and anticipated energy crises, supported by government policies and evolving market trends. Addressing this need, the present study proposes a novel control strategy for an induction motor drive system in EVs, primarily powered by solar PhotoVoltaic (PV) panels. The system employs Field-Oriented Control (FOC) technology to ensure precise motor control, enhanced performance, and reduced energy losses. To enable real-time monitoring and control, an Internet of Things (IoT) based system is integrated, providing valuable insights into the motor drive’s operation and energy consumption. The incorporation of solar PV energy offers a sustainable, long-term alternative to conventional grid-powered sources. The FOC technique further ensures efficient and reliable motor drive operation under varying load conditions. Overall, the synergy of solar energy, advanced motor control, and IoT monitoring presents a highly efficient and eco-friendly solution for future EV applications.