IFE Brage (Institute for Energy Technology)
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Enhancing image data security using the APFB model
Full text linkEnsuring the confidentiality of transmitting sensitive image data is paramount. Cryptography recreates a critical function in safeguarding information from potential risks and confirming the identity of authorised individuals, thereby addressing the growing demand for enhanced image security. This paper presents a novel AES-permuted Feistel Blowfish (APFB) model that aims to improve image data security cost-effectively and enhance data protection by incorporating AES and Blowfish algorithms. The proposed model’s utility over existing approaches stems from its computational efficiency and speed. The proposed model’s resilience and security against several attack modalities are validated through a comprehensive range of methods, including extensive experimentation, histogram analysis, PSNR, entropy, MSE, CC, computational time, and NIST statistical tests. The outcomes yielded a PSNR of 67.26, NPCR of 99.6354, and UACI of 33.412. Additionally, the applicability of the proposed model is validated by utilising a practical case analysis. The outcomes exhibit the relevance of the proposed model in real-world applications.Enhancing image data security using the APFB modelpublishedVersio
Beam–plasma dynamics in finite-length, collisionless inhomogeneous systems
Full text linkThis study investigates the streaming instability triggered by ion motion in a plasma system that is finite in length, collisionless, and inhomogeneous. Employing numerical simulations using particle-in-cell techniques and kinetic equations, the study examines how inhomogeneity emerges from integrating a cold ion beam with a background plasma within a confined system. The findings suggest that steady ion flow can modify ion sound waves through acoustic reflections from system boundaries, leading to instability. Such phenomena are known to be a hydrodynamic effect. However, there are also signatures of the beam-driven ion sound instability where kinetic resonances play a pivotal role. The main objective is to understand the impact of a finite-length system on beam–plasma instability and to identify the wave modes supported in such configurations.publishedVersio
Experimental studies on the heat transfer performance of MHP-PV/T enhanced by Reynolds number
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Aerodynamic and Structural Assessment of Floating Wind Turbine Rotor Under Varying Tilt Angle
Full text linkPredicting the aerodynamic performance of floating offshore wind turbines (FOWTs) proves challenging due to platform motion induced by waves. The effect of wind and waves results in a six-degree-of-freedom motion of the platform, directly influencing turbine performance. Understanding the impact of specific degrees of freedom (DOF) motions on aerodynamics and structural response is crucial for effective wind turbine design. This research examines the impact of rotor tilt on both aerodynamic performance and structural response. The investigation employs computational fluid dynamics (CFD) analysis and mapping aerodynamic loads onto the finite element (FE) mesh for structural analysis. The study employs a comprehensive 3D simulation, utilizing the moving reference frame (MRF) method for the NREL 5 MW reference wind turbine CFD simulations. It explores different rotor tilt angles (5°, 10°, 15°, and 20°) encountered by offshore structures during their operation and examines their impact on aerodynamic performance. Predicted aerodynamic loads were mapped onto the blade FE mesh using the radial basis function (RBF) interpolation technique and solved using the open-source FE solver CalculiX. The analysis shows that the turbine performance is relatively unaffected up to a tilt angle of 10°. However, further increase in rotor tilt angle adversely impacts turbine performance, leading to notable reductions in thrust and power output. The fluid-structure coupled analysis provided insights into the deformations and stresses experienced by the turbine blade, indicating a notable increase in flap-wise displacement for larger tilt angles, while edge-wise displacement is not as significantly affected. The maximum stress location on the blade generally correlates well with actual observations.Aerodynamic and Structural Assessment of Floating Wind Turbine Rotor Under Varying Tilt AnglepublishedVersio
A numerical modeling framework for predicting the effects of operational parameters on particle size distribution in the gas atomization process for Nickel-Silicon alloys
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A review of imaging methods for detection of photoluminescence in field-installed photovoltaic modules
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Engineering a Galinstan-based ferromagnetic fluid for heat management
Full text linkThe development of increasingly smaller electronic devices brings on heat dissipation challenges, which can severely hinder their performance. Consequently, there is a critical need to maintain the working temperature of these devices at optimal values. At room temperature, the versatile design and adaptability of fluidic thermal switches makes them an auspicious solution. In this work, the large heat conductivity and magnetic material compatibility of Galinstan motivated the production of a novel ferromagnetic fluid. Through mechanical alloying within an inert atmosphere, we embedded Ni microparticles in a Galinstan matrix, which provided a liquid metal with a ferromagnetic behavior. This fluid is suitable for a wide range of applications in thermal management. Here, we experimentally demonstrate that a Galinstan-based mixture containing 2.6 wt% of Ni can serve as heat exchange medium in a magnetically activated fluidic thermal switch device. This mixture establishes an optimal thermal bridge between heat source and sink, enabling heat dissipation from the source. This effect intensifies with the device operating frequency, reaching a maximum temperature span of 19.8 % and a maximum switching ratio of 1.26. These results demonstrate the potential of the developed fluid to be integrated into fluidic technologies for temperature control of electronic components.Engineering a Galinstan-based ferromagnetic fluid for heat managementpublishedVersio
