Amirkabir University of Technology

Comparative Surface and Early Biological Responses of α ‐, α + β ‐, and β ‐Type Titanium Alloys

This study investigates the surface and early biological responses of three titanium (Ti) alloys with different phase constitutions and alloy chemistries. Commercially, pure Ti (CP‐Ti), Ti‐6Al‐4V, and Ti‐45Nb were selected as representative α ‐, α + β ‐, and β ‐type alloy systems...

Radiation dose analysis in the IR-IECF device: numerical analysis with geant4 simulation and experimental measurements

This study presents a combined experimental and Geant4-based assessment of the radiation field and shielding performance of the Iranian Inertial Electrostatic Confinement fusion device (IR-IECF) operating in deuterium–deuterium (D–D) mode and producing 2.45 MeV neutrons. A detail...

Experimental investigation of the effects of transverse step position and height on the hydrodynamic performance of an asymmetric catamaran craft in calm water

High-speed catamarans are widely recognized among planing hull configurations due to their superior hydrodynamic stability. The incorporation of transverse steps can enhance performance by promoting flow separation, reducing wetted surface area, and consequently lowering resistan...

Thermal performance enhancement of microchannel heat sinks under an oblique magnetic field for electronic cooling applications

Efficient thermal management of microchannel heat sinks (MCHSs) is essential for high-power electronic systems. This numerical study examines the influence of a magnetic field with variable angles on the flow structure, heat transfer, and hydraulic performance of a rectangular MC...

A new insight into digital rock analysis using deep learning: a comparative study on the effect of hyperparameter selection and data augmentation

Convolutional neural networks (CNNs) have proven to be powerful tools in deriving rock properties from micro-computed tomography (micro-CT) images, providing a data-driven alternative to conventional digital rock physics workflows. However, the reliability performance and computa...

Collapse performance and subsystem response of dual SMF–SCBF systems under nonlinear soil–structure interaction and near-fault motions

Existing collapse assessments do not clarify whether nonlinear soil–structure interaction (SSI) and near-fault ground motions with forward-directivity characteristics only alter global demand or also modify subsystem interaction in dual Special Moment Frame–Special Concentrically...

Alternative Dispute Resolution in Construction Projects in the Middle East: A Systematic and Bibliometric Review

Abstract The construction industry in the Middle East is undergoing unprecedented growth driven by megaprojects, strategic national visions, and large-scale infrastructure development. This expansion has intensified the complexity of contractual relationships, leading to frequent...

Financial, innovation and fiscal drivers of ecological efficiency across Western and Eastern European Union member states

Abstract This study quantifies how green finance, financial development, green technology innovation efficiency and environmental taxes shape ecological efficiency in the European Union, and tests whether these effects differ between Western and Eastern member states. The sample...

Quantum photonic treatment of nano-polarization in diffraction gratings

Diffraction grating devices are composed of equally spaced, identical slits separated by opaque strips. Discrete or monolithic gratings are fabricated by applying fine grooves with a diamond point either on a plane glass surface or on a polished metal mirror to produce transmissi...

A robust model for improving digital marketing using sentiment analysis and two-agent off-policy proximal policy optimization

Understanding consumer sentiment is important in digital marketing because it strongly influences brand perception and purchasing decisions. This paper proposes a novel two-agent off-policy proximal policy optimization (PPO) framework. Unlike standard multi-agent reinforcement le...

Ultrahigh Performance Concrete Beams with Transverse Openings: Evaluating Effects and Reinforcement Strategies

Abstract This paper evaluates the behavior of ultrahigh performance concrete (UHPC) beams with transverse openings, a topic with practical implications that has not been studied thus far. Various parameters were examined; including the opening shape, location, and height; compres...

Artificial intelligence and machine learning applications in Behçet’s disease: a scoping review protocol

Abstract Background Behçet's disease (BD) is a chronic multisystem vasculitis of unknown aetiology with a characteristic geographic distribution along the historic Silk Road, with highest prevalence in Turkey, Iran, and surrounding regions. Diagnosis remains clinical and often de...

Synergistic enhancement of PLA/PBAT-based active packaging films using yarrow extract and cloisite 30B nanoclay

This study investigates the synergistic effects of yarrow (Achillea millefolium L.) extract and Cloisite 30B nanoclay on the structural, mechanical, thermal, antibacterial, and biodegradation behavior of poly(lactic acid)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) (70/30)...

LiDAR-Based Pavement Marking Detection for Construction Engineering: A Systematic Review of Methods and Applications

Abstract Accurate detection of pavement markings is increasingly vital for construction engineering applications such as roadway asset management, site planning, progress tracking, and quality assurance. This systematic review consolidates computational methods for light detectio...

A stock coupled water and material circularity framework quantifies the trade off between water and carbon in data center cooling

Abstract Circular-economy research has centered on materials, carbon and energy, while water circularity remains fragmented and rarely linked to data-center water demand. The gap matters across the Sustainable Development Goals: the build-out pursued under SDG 9 claims directly o...

A new power transformer risk modelling considering cumulative surge effects in insulation coordination studies

Accurate insulation risk assessment plays a critical role in ensuring the reliability of power transformers, given the significant technical complexities involved in their design. Back flashover failure (BF) caused by lightning overvoltages on incoming substation lines must be co...

Fabrication and performance assessment of a new dry in-ear EEG sensor for brain monitoring

Bioelectrodes are commonly utilized for sensing electrical signals from the electrochemical activity of excitable cells, recording ionic currents from the body, and translating them into detectable electrical signals. Conventional scalp EEG electrodes, nonetheless, are subject to...

Nanoparticle-enhanced polymeric fluid for sand control in unconsolidated petroleum wells

Abstract Reservoir pressure depletion can disrupt the stress equilibrium around the wellbore, increasing effective stress and promoting formation failure and sand production in unconsolidated sandstone reservoirs. Conventional mechanical sand-control methods, such as gravel packi...

Design of extremal reentrant auxetics using optimization algorithms

A comprehensive understanding of the optimal achievable ranges of their key mechanical properties and the tradeoffs that govern them, which is foundational for the targeted design of multifunctional, performance-optimized lattices, remains elusive. The purpose of this study is to...

Teaching heat exchanger design using COMSOL Multiphysics in a computer-based lab

Abstract The operation of a heat exchanger is a multiphysics problem, involving the simultaneous flow of two fluids and heat transfer between them. Velocity, pressure and temperature gradients within each fluid vary with location, operating conditions, flow arrangement and heat e...