Abstract/Overview The interaction of primary cosmic rays in the atmosphere produces, among other particles, pions and kaons. They decay to muons, which form an important component of extensive air showers, which can be measured on the Earth's surface. The ratio of positively to negatively charged muons, called the muon charge ratio, provides important information about the cosmic ray interactions in the atmosphere. In this study, the theoretical hadronic interaction models in the cosmic r...
Abstract: The first experimental observation of spin-orbit (SO) coupling in Bose Einstein Con densates (BECs) provided an interesting new platform to explore a fascinating and growing field of research and lead to rich physical e↵ects. In ultracold atomic sys tems,the synthetic SO coupling can be generated using two counter-propagating Ra man lasers that couple two hyperfine ground states. Motivated by these experimental findings, some theoretical activities have been committed to the phys...
Abstract: We start by considering the theory of electromagnetic waves, from the Maxwell’s equa tions, the extended (1+1)D complex Ginzburg-Landau equation, higher-order nonlin ear Schr¨odinger equation are derived with the third, fourth, fifth and sixth-order dis persions and the cubic, quintic, and septic nonlinear terms, describing the dynamics of extremely short pulses in nonlinear undoped and doped optical fibers. The linear stability analysis is employed to extract an expression for ...
Abstract: We study the mutual effects of neuronal electrical activity and DNA dynamics in a network of electrically coupled neurons with nearest neighbors communication. For that we develop by means of the coupling function method, a mathematical DNA-neuron model that can be considered as an extension of the simplified Hodgkin-Huxley models. Numerically, we explore the biological properties of the model with emphasis on local phase transitions and synchronous neural activity. Our results sug...
Abstract: Recently, organic and inorganic pollutants including heavy metals, effluents, dyes, and bacteria have been removed from wastewater and other environmental settings using nanomaterials. Combining two or more nanomaterials to form nanocomposites offers improved and tailored properties for these applications. Metal-polymer nanocomposite exhibit elevated optical, electrical, thermal and mechanical properties, which make them interesting candidates for the manufacturing of functional de...
Abstract: Zinc Oxide (ZnO) is a promising semiconductor material suitable for the application in electronic and optoelectronic systems. ZnO tailored into nanorods has a potential to be used in photovoltaic cells due to its large surface area to volume ratio that allows for maximum light harvesting and improved electron transportation efficiency. ZnO nanorods that are less compact, thin and long with fewer defects can be used for organic/inorganic solar cells application. In this study ch...
Abstract: This thesis focuses on biological shielding calculations for a 10 MeV Rhodotron electron beam accelerator operating in dual mode to produce a 10 MeV primary electron beam and 7.5 MeV secondary X-rays, generated by hitting an optimized tantalum-73 (73Ta) target with the primary electron beam. The first part of this thesis describes the Rhodotron electron accelerator and its oper ating principle. A model is presented for the transverse optics of a TT-100 Rhodotron accelerator. Potent...
Abstract: Surface photovoltage (SPV) spectroscopy is a powerful tool for studying electronic defects on semiconductor surfaces, at interfaces, and in bulk for a wide range of materials. Undoped and Cobalt-doped TiO 2 (CTO) thin films were deposited on Crystalline Silicon (c-Si) and Flourine doped Tin oxide (SnO 2 :F) substrates by chemical spray pyrolysis at a substrate temperature of 400 °C. The concentration of the Co dopant in the films was determined by Rutherford backscattering spectro...
Abstract: We propose a modified version of the Bennett–Brassard 1984 quantum key distribution protocol intended to tolerate losses, certain forms of noise, and the so-called photon number splitting attack. These are the issues facing the realization of practical quantum key distribution. The modified protocol is based on quantum non-demolition measure ments for systems using weak coherent pulses. Our scheme ensures that emissions cor responding to zero photon pulses, multi-photon pulses, a...
Abstract: We consider a model network of diffusively coupled Hindmarsh-Rose neurons to study both analytically and numerically, long-range memory effects on the modulational instability phenomenon, chaotic, synchronous and chimera states within the network. The multiple scale method is used to reduce the generic model into a discrete nonlinear Schrödinger equation. The latter is explored in the linear stability analysis and the instability criterion along with the critical amplitude are der...
Abstract: The dynamics of light bullets propagating in nonlinear media with linear/nonlinear, gain/loss and coupling described by the (2+1)-dimensional vectorial cubic–quintic complex Ginzburg–Landau (CGL) equations is considered. The evolution and the stability of the vector dissipative optical light bullets, generated from an asymmetric input with respect to two transverse coordinates x and y, are studied. We use the variational method to find a set of differential equations characteri...
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A detailed study about Electricity and Magnetism Electric charges and induction, Electric Field and Electric Field Lines, Electric Flux etc.
ABSTRACT The importance of sand bed filters has gained more ground in on- site water treatment facilities. The performance of which depends on the design of the sand bed. A laboratory column experiment was designed to quantitatively determine the best kind of sand layered arrangement for maximal bacteria attenuation. Porosity was taken as media parameter to further examine the relationship between the layers that will yield a better performance. Porosity was determined using volumetric appro...
ABSTRACT The results of an investigation of open channel flow in the laminar and transition range are presented. This type of flow found its application in runoff from rainfall. Values of Reynolds number were determined for different slopes in the range 10≤ 0≤ 450. It was found that the velocity of the fluid increases ar the slope of the bottom surface increases. There was a point where the laminar flow range change drastically to transitional flow range and later turbulent.