arXiv subjects

Usman Saeed

Publications and source records attributed to Usman Saeed.

3 recordsLinked to original sources

arXiv2025

Solar Wind Penetration into Dusty Magnetospheres creates Electrostatic Waves and Structures

The low frequency electrostatic perturbations have been investigated in a bi ion plasma in the background of static dust. It is shown that the field aligned shear flow of both the ions produce low frequency electrostatic instabilities and create nonlinear structures, the double layers and the solitons. The general theoretical model is applied to the magnetospheres of Jupiter (with positively charged dust) and Saturn (with negatively charged dust) which have oxygen ions in addition to protons. This model predicts the existence of extremely low frequency electrostatic waves with real frequencies of the order of a milli Hertz (mHz) to several mHz and this range of frequencies have been reported in literature for these plasma environments. The estimated width of the nonlinear structures vary from a few hundred meters to a few kilometers. These structures are similar to that observed in the oxygen and oxygen hydrogen plasmas in Earth's upper ionosphere which is free from dust.

physics.plasm-ph↗

arXiv2020

Explosive Material Detection and Security Alert System (e-DASS)

The terrorism rate in Pakistan becomes higher even after the advancement of information technology. Especially APS Attack and numerous other in different part of country. The root cause of such attacks as according to our research is as: terrorists utilizing the benefit of lack of a full proof security check system. Traditional explosive detection systems are large in size, expensive and require manual attention. These systems are not much useful due to its public visibility intruder or terrorists can easily bypass the system using another route. This term paper is mainly focusing on explosive material detection using IoT with WSN. Explosive Material Detection and security alert system (e-DASS) consists of several hundreds of nodes depending upon the geographical area we are going to cover. Each node should be able to communicate with the other node and update the information if necessary. Tracking of the target can be done in an easier and faster way because all the nodes are synchronized. (e-DASS) is a power efficient explosive detection system. Most of the times nodes will be in the idle state, unless and until positive presence of an explosive is found.

eess.SP↗

arXiv2015

Extraordinary Drift Wave in Space and Cylindrically Bounded Heavy Ion Plasmas

It is pointed out that electrostatic and electromagnetic waves propagating in perpendicular direction to the density gradient $\nabla n_0=\hat{x} |\frac{dn_0}{dx}|$ and external magnetic field $\vec{B}_0=B_0 \hat{z}$ in hybrid frequency range $\Omega_i \ll \omega \ll \Omega_e$ (where $\Omega_j=\frac{eB_0}{m_j c}$ and $j=e,i$) have several applications in space and laboratory plasmas. The electron plasma waves are important for the future experiments on heavier ion plasmas as well as the results are applicable to the experiments performed to create pure pair ion fullerene plasmas. The electrostatic modes are shown to exist in upper F-region of terrestrial ionosphere and electromagnetic waves are applied to cylindrically bounded heavy ion plasmas.

physics.plasm-ph↗