Search Results for Hayder I. Khaleel
Abstract
In this work, we do a comprehensive examination of the mechanisms of magneto-optical amplification in silicon nanostructured photodetectors, including laser-assisted fabrication and coupling with an external magnetic field. The performance of photodetectors is improved by the crystallinity of Au@Pb core-shell nanoparticles being greatly improved by pulsed laser ablation in liquid (PLAL) under magnetic field. The experimental results demonstrate that the responsivity is enhanced from 0.220 A/W to 0.445 A/W at 550 nm with an external quantum efficiency (EQE) of 95% and a specific detectivity of 2.1 × 1013 Jones with the applied magnetic field of 0.3 T. The primary physical processes are the change of hot electron trajectories by Lorentz force, giant magnetoresistance (GMR) in hybrid metal-semiconductor devices and the Purcell enhancement in magneto-dielectric nanostructures. This work offers the theoretical and practical framework for next-generation silicon-compatible magneto-optical detectors for quantum sensing, optical magnetometry and weak-signal detection
Abstract
This research aims to clarify the extent of practicing organizational silence among employees in private colleges and universities in Baghdad. In order to achieve this, the questionnaire was used as a main tool for data collection, as the sample reached (108) employees. The research reached a set of conclusions and recommendations. Among the most important conclusions, the responses of the research sample showed a weak level of organizational silence in private colleges and universities, with the exception of the first dimension, which reflected the presence of Apprehension among employees of the profession, due to the fear of negative reactions of the senior management, which employees see as having harmful effects for them. Among the most important recommendations is the necessity of maintaining the organizational climate generally prevailing in private colleges and universities and trying to strengthen them in order to avoid the excessive appearance of organizational silence, and to support the initiative spirit among employees, and adopt this as part of the management philosophy.