Islamic Azad University, Tehran

Safe and adaptive control of non-stationary stochastic systems via Lyapunov-constrained distributional reinforcement learning

Abstract Non-stationary environments pose significant challenges for reinforcement learning (RL), particularly in safety-critical applications like robotics and energy systems, where adaptability, stability, and robustness to uncertainty are essential. This paper introduces Lyapu...

Analytical determination of contamination depth of 137 Cs point sources in reactor building walls

Abstract The presence of radioactive contamination in concrete structures poses a silent yet serious threat to both environmental safety and public health. Such contamination, if not properly localized, can lead to prolonged radiation exposure, difficulties in decommissioning, an...

Interactions of Multiple Curved Cracks in an FGP Strip: Mixed Mode Analysis

ABSTRACT This paper investigates multiple embedded curved cracks in a functionally graded piezoelectric (FGP) strip. In order to compute Mode I/II stress intensity factors (SIFs) and electric displacement intensity factor (EDIF), distributed dislocation technique (DDT) is employe...

Vibration-based non-destructive evaluation of dual cracks in bidirectionally functionally graded nanobeams: a nonlocal elasticity–metaheuristic optimisation framework for structural health monitoring

Cracks in functionally graded nanobeams used in MEMS/NEMS devices can significantly reduce stiffness and reliability, and identifying multiple cracks at the nanoscale is challenging because nonlocal effects and bidirectional material gradation must be accounted for. To address th...

A soft-switched, trans-inverse step-up DC-DC converter with minimal components based on built-in transformer

A new single-switch, high-gain DC-DC converter with low component count and low input current ripple is proposed for renewable energy systems. The proposed topology integrates a Three-Winding Built-In Transformer (TWBIT) with zero DC magnetizing current and a voltage multiplier t...

Suggestibility, Psychic Pain, and Body Dysmorphic Disorder Symptoms: The Mediating Role of Defense Mechanisms

Body dysmorphic disorder (BDD) is characterized by an increased self-perception of one’s own appearance and an intense aspiration for beauty, which may elevate the likelihood of being easily suggestible, cause mental suffering, and impair ego functions. This study investigated th...