Search Results - "Tawfik, Walid"

Investigation on the effects of laser parameters on the plasma profile of copper using picosecond laser induced plasma spectroscopy by Fikry, Mohamed, Tawfik, Walid, Omar, Magdy M.

“…Laser induced plasma generation and characterization, affected by laser parameters and sample physical properties, represent important phenomena in many fields…”
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Removal of Atrazine from contaminated water by functionalized graphene quantum dots by Hellal, Ahmed, Abdelsalam, Hazem, Tawfik, Walid, Ibrahim, Medhat A.

“…The limitation of clean water supplies and the increment of water pollution resources, like industrial processes, oil pollution, and herbicides, are urgent…”
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Measurement of the Electron Temperature in a Metallic Copper Using Ultrafast Laser-Induced Breakdown Spectroscopy by Fikry, Mohamed, Tawfik, Walid, Omar, Magdy

“…In this paper, we provide the laser-induced breakdown spectroscopic (LIBS) analysis of copper under the action of the ultrafast picosecond Nd:YAG laser and the…”
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Assessment of doped graphene in the removal of atrazine from water by Hellal, Ahmed, Abdelsalam, Hazem, Tawfik, Walid, Ibrahim, Medhat A.

“…Atrazine is a widely used toxic herbicide that poses a threat to both the environment and human health. This study investigates the removal of Atrazine from…”
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Chitosan/graphene oxide composite as an effective removal of Ni, Cu, As, Cd and Pb from wastewater by Menazea, Abdelrhman A., Ezzat, Hend A., Omara, Wessam, Basyouni, Osama H., Ibrahim, Samah A., Mohamed, Aya A., Tawfik, Walid, Ibrahim, Medhat A.

“…MESP calculations using DFT theory at B3LYP level with LANL2DZ basis set for (a) CS, (b) CS + Ni, (c) CS + Cu, (d) CS + As, (e) CS + Cd, (f) CS + Pb. [Display…”
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Improved LIBS limit of detection of Be, Mg, Si, Mn, Fe and Cu in aluminum alloy samples using a portable Echelle spectrometer with ICCD camera by Mohamed, Walid Tawfik Y.

“…Laser-induced breakdown spectroscopy (LIBS) is a laser-based technique that can provide non-intrusive, qualitative and quantitative measurement of metals in…”
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Fast determination of phosphorus concentration in phosphogypsum waste using calibration-free LIBS in air and helium by Elsayed, Khaled, Tawfik, Walid, Khater, Ashraf E. M., Kayed, Tarek S., Fikry, Mohamed

“…This work represents a novel method to determine phosphorus (P) concentration in phosphogypsum (PG) waste samples using calibration-free laser-induced…”
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Determination of heavy metal content and pollution indices in the agricultural soils using laser ablation inductively coupled plasma mass spectrometry by Shaheen, Mohamed E., Tawfik, Walid, Mankoula, Asmaa F., Gagnon, Joel E., Fryer, Brian J., El-Mekawy, Farouk

“…In this study, we determined the concentrations of heavy metals in the agricultural soils of Kafr El-Zayat city using laser ablation inductively coupled plasma…”
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Evaluation of Heavy Metal Presence in Agricultural Samples of Lactuca sativa and Trifolium alexandrinum Using Picosecond Laser-Induced Breakdown Spectroscopy and Flame Atomic Absorption Spectroscopy in Banha and Giza Governorates, Egypt by Noura Fayek, Walid Tawfik, Ahmed Khalafallah, Sawsan Hamed, Wafaa Mousa, Mohamed Fikry

“…This pioneering study utilizes Flame Atomic Absorption Spectroscopy (FAAS) and Picosecond Laser-Induced Breakdown Spectroscopy (Ps-LIBS) to quantify heavy…”
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Orange pulp in Nile tilapia (Oreochromis niloticus) diets: Growth performance, biochemical parameters and gene expression for growth and fat metabolism by Tawfik, Walid, Nassef, Eldsokey, Bakr, Abdelnasser, Hegazi, Elsayed, Ismail, Tamer Ahmed, Abdelazim, Aaser M., El-Nagar, Sahar H., Sabike, Islam, Fadl, Sabreen E., Sharoba, Ashraf M.

“…The experiment investigated the effect of dietary orange pulp (OP) with or without enzymes supplementation on the performance parameters, chemical composition,…”
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Spectroscopic determination of the stark broadening parameters of Al (I) 305.007 nm in atmospheric air using picosecond time-resolved LIPS by Fikry, Mohamed, Tawfik, Walid, Omar, Magdy M

“…•Novel determination of the Stark Broadening Parameters of Al (I) 305.007 nm.•Ultrafast time-resolved picosecond laser-induced plasma spectroscopy is…”
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Reaching white-light radiation source of ultrafast laser pulses with tunable peak power using nonlinear self-phase modulation in neon gas by Tawfik, Walid

“…A source of white-light radiation that generates few-cycle pulses with controlled peak power values has been developed. These ultrafast pulses have been…”
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Detection of toxicity in some oral antidiabetic drugs using LIBS and LA-TOF-MS by Ahmed, Nasar, Liaqat, Usman, Rafique, M., Baig, M. Aslam, Tawfik, Walid

“…•Detection of carcinogenic elements in the antidiabetic tables.•Rapid and effective method for the identification the of antidiabetic pills without using…”
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Analysis of polystyrene and polycarbonate used in manufacturing of water and food containers using laser induced breakdown spectroscopy by Farooq, W.A., Al-Johani, Awatef S., Alsalhi, M.S., Tawfik, Walid, Qindeel, Rabia

“…Laser-induced breakdown spectroscopy (LIBS) is one of the analytical techniques which has vast applications in the material analysis. We have applied LIBS…”
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Assessment of contamination levels of heavy metals in the agricultural soils using ICP-OES by Shaheen, Mohamed E, Tawfik, Walid, Mankola, Asmaa F., Gagnon, Joel E., Fryer, Brian J., El-Mekawy, Farouk M.

“…This work was carried out to monitor contamination levels of twelve heavy metals (HMs) in the agricultural soils of Kafr El-Zayat city in Egypt. The…”
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Analysis of alumina-based titanium carbide composites by laser-induced breakdown spectroscopy by Ahmad, Kaleem, Tawfik, Walid, Farooq, Wazirzada A., Singh, Jagdish P.

“…In this work, alumina (Al 2 O 3 ) containing different volume % of titanium carbide (TiC) ranging from 0 to 30 were consolidated by the novel spark plasma…”
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A new vision of photothermal therapy assisted with gold nanorods for the treatment of mammary cancers in adult female rats by Gamal, Hend, Tawfik, Walid, El-Sayyad, Hassan IH, Emam, Ahmed N, Fahmy, Heba Mohamed, El-Ghaweet, Heba A

“…Over the past decade, the therapeutic landscape has markedly changed for patients with breast cancers (BCs), yet few studies have evaluated the power of the…”
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Controlling the length of plasma waveguide up to 5 mm, produced by femtosecond laser pulses in atomic clustered gas by Mohamed, Walid Tawfik, Chen, Guanglong, Kim, Jaehoon, Tao, Geng Xiao, Ahn, Jungkwen, Kim, Dong Eon

“…We report the observation of longitudinally uniform plasma waveguide with a controlled length of up to nearly 5 mm, in argon clustered gas jet. This…”
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Corrigendum to “Ar plasma waveguide produced by a low-intensity femtosecond laser” [Opt. Commun. 285(10–11) (2012) 2627–2631] by Chen, Guanglong, Geng, Xiaotao, Mohamed, Tawfik Walid, Xu, Hongxia, Mi, Yiming, Kim, Jaehoon, Kim, Dong Eon

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Ar plasma waveguide produced by a low-intensity femtosecond laser by Chen, Guanglong, Geng, Xiaotao, Mohamed, Tawfik Walid, Xu, Hongxia, Mi, Yiming, Kim, Jaehoon, Kim, Dong Eon

“…Using the interaction of a low-intensity femtosecond laser pulse (30fs, 6×1015Wcm−2) with argon cluster jet produced from a slit nozzle, we experimentally…”
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