M. A. Mahmoud
A5108167242- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Gold and Silver Nanoparticles Synthesis and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Distributed and Parallel Computing Systems
- Quantum Dots Synthesis And Properties
- Medical Imaging Techniques and Applications
- Nuclear reactor physics and engineering
- Cold Atom Physics and Bose-Einstein Condensates
- Muon and positron interactions and applications
- Nanomaterials for catalytic reactions
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Copper-based nanomaterials and applications
Fayoum University
2014-2025
A. Alikhanyan National Laboratory
2021-2024
Institute of High Energy Physics
2013-2024
Universidade do Estado do Rio de Janeiro
2014-2024
University of Antwerp
2024
Al-Azhar University
2024
Academy of Scientific Research and Technology
2014-2023
Helsinki Institute of Physics
2012-2023
University of Helsinki
2023
National Institute of Chemical Physics and Biophysics
2023
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
Five different hollow cubic nanoparticles with wall length of 75 nm were synthesized from platinum and/or palladium elements. The five nanocatalysts are pure nanocages (PtNCs), (PdNCs), Pt/Pd shell−shell (NCs) (where Pd is defined as the inner shell around cavity), Pd/Pt NCs, and Pt−Pd alloy NCs. These used to catalyze reduction 4-nitrophenol sodium borohydride. kinetic parameters (rate constants, activation energies, frequency factors, entropies activation) each shell/shell NCs found be...
Surface plasmon resonance (SPR) wavelength of plasmonic nanoparticles is sensitive to changes in the dielectric function its exposed surface medium. Gold nanocages (AuNCs) have two surfaces (inner and outer) thus fields., When medium around outer only, SPR shifts different extent from that observed when constant both surfaces. This property AuNCs was used elucidate mechanism catalytic reduction 4-nitro 4-amino phenol, whether it occurring within cavity or on exterior nanocages. For this...
It is usually observed and understood that aggregation of silver gold solid nanoparticles gives rise to enhanced SERS spectra due the increased plasmon field between particles. In present work, we increase Langmuir−Blodgett assembled 80 nm nanoframe particles reduces efficiency surface-enhanced Raman adsorbed thiophenol molecules. Using discrete dipole approximation simulation plasmonic fields a pair nanoframes as function their interparticle separation, it found at large separation inside...
The surface-enhanced Raman scattering spectrum of poly(vinyl) pyrrolidone (PVP) molecules capping 50 nm silver nanocubes assembled in a monolayer via the Langmuir−Blodgett (LB) technique is studied at different surface pressures (at nanoparticle densities). observed correlation between intensity SERS bands PVP with density and those extinction localized plasmon resonance (as measure field) suggests following: (1) enhancement results mostly from fields aggregated nanoparticles; (2) relative...
Most gold nanoparticles have surface plasmon fields only surrounding their surfaces. Recently, hollow been studied, such as nanocages (AuNC) and nanoframes (AuNF). Those particles two types of surfaces, one facing the outside other within cavity. Their coupling provides a field inside particle on surface. Using DDA computational method, we shown that between these gives intensities distribution are sensitive to thickness (the distance surfaces) well nanoparticle size. For small sizes,...
Hollow metallic nanoparticles have been attracting the attention of many researchers in past five years due to their new properties and potential applications. The unique structure hollow nanoparticles; presence two surfaces (internal external), both cavities pores wall these are responsible for Here galvanic replacement technique is used prepare nanocages made gold, platinum, palladium. In addition, double shell metal shells like Au–Pt, Pt–Au, Au–Pd, Pd–Au, Pd–Pt, Pt–Pd. Silver nanocubes as...
The photodegradation of methyl orange was found to take place very efficiently using hollow Au nanocages which are known have remaining Ag on their interior walls can be oxidized Ag(2)O. degradation rate is more efficient than reaction semiconductor nanomaterials, such as TiO(2) and ZnO. increase by increasing the degree oxidation wall prior a function nanocavity size pore density nanocage walls. As cage varies, it that photocatalytic increases then decreases with maximum at nanoparticle 75...
In the path towards a muon collider with center of mass energy 10 TeV or more, stage at 3 emerges as an appealing option. Reviewing physics potential such is main purpose this document. order to outline progression performances across stages, few sensitivity projections for higher are also presented. There many opportunities probing new collider. Some them in common extensively documented case CLIC stage, and include measuring Higgs trilinear coupling testing possible composite nature boson...
Silver nanocubes (72 nm) and gold nanocages (75 were assembled by varying the average interstitial particle distances Langmuir−Blodgett technique. The shape of surface pressure−area isotherms for two types nanoparticles are discussed in terms degree capping each nanoparticle which depends on quality. Monolayer films formed at different pressures transferred vertical dipping method to silicon glass substrates where their optical spectra SEM images examined. A red-shift strong plasmon peak...
Alumina and silica have been the most commonly used solid supports in recovery of colloidal nanocatalysts solution. In order to avoid possible involvement support catalytic mechanism, polystyrene microspheres are here demonstrated be effective nonreactive on which nanocatalyst can easily attached by using swelling shrinking properties microspheres. The activation energy reduction 4-nitrophenol with sodium borohydride platinum nanocubes free solution is comparable those
In view of the High Luminosity upgrade CERN LHC, forward CMS Muon spectrometer will be extended with two new stations improved Resistive Plate Chambers (iRPC) covering pseudorapidity range from 1.8 to 2.4. Compared present RPC system, gap thickness is reduced lower avalanche charge, and an innovative 2D strip readout geometry proposed. These improvements allow iRPC detector cope higher background rates. A Front-End-Board (FEB) designed signals a threshold as low 30 fC integrated Time Digital...
Abstract Poly vinyl alcohol (PVA) incorporated with different weight percent of Silver nanoparticles (Ag NPs) were prepared. The enhancement factors for each band in the Raman spectra calculated and degree found to be increased as Ag NPs increases up 0.3%, thereafter it decreases. Some bands red shifted while others blue shifted. overtones FTIR photoacoustic recorded show same behavior those bands. X‐ray diffraction pattern showed that PVA has a high crystallinity. UV–vis samples increase...
A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges producing collisions at high luminosity and 10 TeV centre mass are being investigated by recently-formed International Muon Collider Collaboration. This Review summarises status recent advances on colliders design, physics detector studies. aim to provide global perspective field outline directions future work.
Abstract The CMS detector, including its muon system, has been operating at the CERN LHC in increasingly challenging conditions for about 15 years. detector was designed to provide excellent triggering and track reconstruction muons produced proton–proton collisons an instantaneous luminosity ( $$\mathcal {L}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>L</mml:mi> </mml:math> ) of $$1 \times 10^{34}$$ <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>×</mml:mo> <mml:msup>...
This document is comprised of a collection updated preliminary parameters for the key parts muon collider. The follow on from October 2023 Tentative Parameters Report. Particular attention has been given to regions facility that are believed hold greater technical uncertainty in their design and have strong impact cost power consumption facility. data collected collaborative spreadsheet transferred overleaf.