Search

Your search keyword '"Abdelkarim A"' showing total 13,725 results
Start Over Author "Abdelkarim A"
13,725 results on '"Abdelkarim A"'

209. Electroluminescence of monolayer WS$_2$ in a scanning tunneling microscope: the effect of bias polarity on the spectral and angular distribution of the emitted light

Author

Román}, Ricardo Javier Peña, Pommier, Delphine, Bretel, Rémi, López, Luis E. Parra, Lorchat, Etienne, Chaste, Julien, Ouerghi, Abdelkarim, Moal, Séverine Le, Boer-Duchemin, Elizabeth, Dujardin, Gérald, Borisov, Andrey G., Zagonel, Luiz F., Schull, Guillaume, Berciaud, Stéphane, and Moal, Eric Le

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Inelastic electron tunneling in a scanning tunneling microscope (STM) is used to generate excitons in monolayer tungsten disulfide (WS$_2$). Excitonic electroluminescence is measured both at positive and negative sample bias. Using optical spectroscopy and Fourier-space optical microscopy, we show that the bias polarity of the tunnel junction determines the spectral and angular distribution of the emitted light. At positive sample bias, only emission from excitonic species featuring an in-plane transition dipole moment is detected. Based on the spectral distribution of the emitted light, we infer that the dominant contribution is from charged excitons, i.e., trions. At negative sample bias, additional contributions from lower-energy excitonic species are evidenced in the emission spectra and the angular distribution of the emitted light reveals a mixed character of in-plane and out-of-plane transition dipole moments.

Published
2022
Full Text
View/download PDF

214. Comparison of Solar-Powered MCDI and RO Groundwater Desalination for Mediterranean Agriculture

Author

Hellriegel, Ulrich, Kurz, Edgardo Cañas, Nasfi, Adam, Neumann, Simon, Hdoufane, Abdelkarim, El-Abbassi, Abdelilah, Jaiti, Fatima, Anane, Makram, Hoinkis, Jan, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, Gawad, Iman O., Editorial Board Member, Nayyar, Anand, Editorial Board Member, Amer, Mourad, Series Editor, Ksibi, Mohamed, editor, Sousa, Arturo, editor, Hentati, Olfa, editor, Chenchouni, Haroun, editor, Lopes Velho, José, editor, Negm, Abdelazim, editor, Rodrigo-Comino, Jesús, editor, Hadji, Riheb, editor, Chakraborty, Sudip, editor, and Ghorbal, Achraf, editor

Published
2024
Full Text
View/download PDF

215. Evidence for Highly p-type doping and type II band alignment in large scale monolayer WSe2 /Se-terminated GaAs heterojunction grown by Molecular beam epitaxy

Author

Pierucci, Debora, Mahmoudi, Aymen, Silly, Mathieu, Bisti, Federico, Oehler, Fabrice, Bonell, Gilles Patriarche Frédéric, Marty, Alain, Vergnaud, Céline, Jamet, Matthieu, Boukari, Hervé, Lhuillier, Emmanuel, Pala, Marco, and Ouerghi, Abdelkarim

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

Two-dimensional materials (2D) arranged in hybrid van der Waals (vdW) heterostructures provide a route toward the assembly of 2D and conventional III-V semiconductors. Here, we report the structural and electronic properties of single layer WSe2 grown by molecular beam epitaxy on Se-terminated GaAs(111)B. Reflection high-energy electron diffraction images exhibit sharp streaky features indicative of a high-quality WSe2 layer produced via vdW epitaxy. This is confirmed by in-plane x-ray diffraction. The single layer of WSe2 and the absence of interdiffusion at the interface are confirmed by high resolution X-ray photoemission spectroscopy and high-resolution transmission microscopy. Angle-resolved photoemission investigation revealed a well-defined WSe2 band dispersion and a high p-doping coming from the charge transfer between the WSe2 monolayer and the Se-terminated GaAs substrate. By comparing our results with local and hybrid functionals theoretical calculation, we find that the top of the valence band of the experimental heterostructure is close to the calculations for free standing single layer WSe2. Our experiments demonstrate that the proximity of the Se-terminated GaAs substrate can significantly tune the electronic properties of WSe2. The valence band maximum (VBM, located at the K point of the Brillouin zone) presents an upshifts of about 0.56 eV toward the Fermi level with respect to the VBM of WSe2 on graphene layer, which is indicative of high p-type doping and a key feature for applications in nanoelectronics and optoelectronics.

Published
2022

216. New fixed point theorems for $(\phi, F)-$contraction on rectangular b-metric spaces

Author

Rossafi, Mohamed and Kari, Abdelkarim

Subjects
Mathematics - General Topology, Mathematics - Metric Geometry, Primary 47H10, Secondary 54H25
Abstract

The Banach contraction principle is the most celebrated fixed point theorem, it has been generalized in various directions. In this paper, inspired by the concept of $(\phi, F)-$contraction in metric spaces, introduced by Wardowski. We present the notion of $(\phi, F)-$contraction in $b-$rectangular metric spaces to study the existence and uniqueness of fixed point for the mappings in this spaces. Our results improve many existing results.

Published
2022

217. Hybridization and localized flat band in the WSe2/MoSe2 heterobilayer grown by molecular beam epitaxy

Author

Khalil, Lama, Pierucci, Debora, Velez, Emilio, Avila, José, Vergnaud, Céline, Dudin, Pavel, Oehler, Fabrice, Chaste, Julien, Jamet, Matthieu, Lhuillier, Emmanuel, Pala, Marco, and Ouerghi, Abdelkarim

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Nearly localized moire flat bands in momentum space, arising at particular twist angles, are the key to achieve correlated effects in transition-metal dichalcogenides. Here, we use angle-resolved photoemission spectroscopy (ARPES) to visualize the presence of a flat band near the Fermi level of van der Waals (vdW) WSe2/MoSe2 heterobilayer grown by molecular beam epitaxy. This flat band is localized near the K point of the Brillouin zone and has a width of several hundred meVs. By combining ARPES measurements with density functional theory (DFT) calculations, we confirm the coexistence of different domains, namely the reference 2H stacking without layer misorientation and regions with arbitrary twist angles. For the 2H-stacked heterobilayer, our ARPES results show strong interlayer hybridization effects, further confirmed by complementary micro- Raman spectroscopy measurements. The spin-splitting of the valence band at K is determined to be 470 meV. The valence band maximum (VBM) position of the heterobilayer is located at the Gamma point. The energy difference between the VBM at Gamma and the K point is of -60 meV, which is a stark difference compared to individual 1L WSe2 and 1L WSe2, showing both a VBM at K.

Published
2022

218. Fixed point theorems in controlled rectangular metric spaces

Author

Rossafi, Mohamed and Kari, Abdelkarim

Subjects
Mathematics - General Topology, Mathematics - Functional Analysis, Mathematics - Metric Geometry, Primary 47H10, Secondary 54H25
Abstract

In this paper, we introduce an extension of rectangular metric spaces called controlled rectangular metric spaces, by changing the rectangular inequality as follows: \begin{equation*} d(x, y)\leq\alpha(x, u)d(x, u)+\alpha(u, v)d(u, v)+\alpha(v, y)d(v, y), \end{equation*} for all distinct $x, y, u, v\in X$ with the function $\alpha: X\times X\rightarrow[1,\infty[$. We also establish some fixed point theorems for self-mappings defined on such spaces. Our main results extends and improves many results existing in the literature. Moreover, an illustrative example is presented to support the obtained results.

Published
2022

220. Exploring the performance of Coriandrum sativum extract as an effective corrosion inhibitor for mild steel in a [formula omitted] medium, and its sustainable application in the eco-friendly removal of heavy metals

Author

Kadiri, Lamya, Galai, Mouhsine, Ouass, Abdelkarim, Essaadaoui, Youness, Khattabi, Mohamed, Kaya, Savaş, Arrousse, Nadia, El Khattabi, Omar, Cherkaoui, Mohammed, Rifi, El Housseine, Lebkiri, Ahmed, Al-Sadoon, Mohammad K., and Al-Maswari, Basheer M.

Published
2024
Full Text
View/download PDF

224. Characterisation of older patients that require, but do not undergo, emergency laparotomy: a multicentre cohort study

Author

Shearer, Rosalyn, Mekhail, Peter, Ramsay, George, Nessa, Ashrafun, Iqbal, Rizwan, Maskell, Perry, Majeed, Mudassar, Dai, Nick, Bhojwani, Deepika, Anyomih, Theophilus, Lunevicius, Raimundas, Elkalbash, Rema, Shahzad, Khalid, Ahmed, Salma, Gahunia, Sukhpreet, Hopley, Philip, Nair, Dheepa, Reddington, Anne, Wilson, Jeremy, Lovett, Bryony, Iqbal, Muhammad Rafaih, Ramadan, Wafaa, Affify, Emma, Khan, Fatima, Tan, Silvian, Dawson, Joy, Eltarhoni, Khadiga, Young, Jamie, Lockwood, Sonia, Yiasemidou, Marina, Orchard, Melanie, Orchard, Phillipa, Randall, Jonathan, Barrow, Hannah, Dixon, Steve, Eardley, Nicola, Rajput, Kunal, Santoro, Giovanni, Mason, Sabrina, Bagnall, Nigel Mark, Kourdouli, Amar, Rajain, Sakshi, Curley, Daniel, Chandima Halahakoon, Vijitha, Thrikandiyur, Anu, Worsfold, James, Chouari, Tarak, Dent, Paul, Zhao, Sarah, Belgaumkar, Ajay, Maher, Sarah, Oyewole, Bankole, Weller, Sam, Davis, Mark, Fox, Katherine, Burton, Sarah, Iosif, Evangelia, Tobbal, Muhammed, Abdelkarim, Mostafa, Duvnjak, Haris, Morgan, Richard, Murali, Sreedutt, Murji, Bhaven, Venkatesan, Gowtham, Boardley, Rachael, Carson, Daniel, Galbraith, Norman, MacTier, Mhairi, Mailley, Keir, Meney, Laura, Persson, Pia, Stevenson, Richard, Haigh, Andrew, Kelly, Diane, Mellor, Samantha, Niaz, Muhammad Adnan, Peter, Mark, Smith, Douglas, Perin, Giordano, Hanbali, Nabih, Blackwell, James, Daliya, Prita, Herrod, Philip, Jibreel, Mohammed, Malcolm, Francesca, Photiou, Dana, Al-Khaddar, Ziad, Amir, Farhat, Bughio, Mumtaz, Gardiner, Felicity, Joyce, Nikki, Kennedy-Dalby, Andrew, Khan, Usman, McCoy, Sharon, Smart, Christopher J., Ward, Simon, Abdelsaid, Kirolos, AbdulAal, Yasser, Berski, Michael, Jayasankar, Balaji, Sandhu, Banher, Akhteruzzaman, Tahiyyah, Chan, Shirley, Dickson-Lowe, Richard, Kocsis, Anna Maria, Allen, Rhian, Bateman, Kellie, Shovelton, Charmaine, Smyth, Edward, Taylor, Daniel, Tennant, Anna, Chang, Jessica, Dowdeswell, Megan, Karri, Santosh, Neophytou, Chris, Yassin, Nuha, Bibi, Saira, Ulain, Noor, Evans, Luke, Cross, Katie, Fakhrul-aldeen, Mohammed, Jones, Stacey, Sarveswaran, Janahan, Aljarad, Feras, Collins, Amy, Eves, Joshua, Patel, Maleene, Sharieff, Imran, Smith, Emma, Treus, Estefania, McGuigan, Mari-Claire, Nicholoson, Gary, Pickering, Stacey, Husain, Najam, Narayanasamy, Sangara, Pradeep, Thomas, Rajebhosale, Ramprasad, Ravi, Prabhu, Elabbassy, Islam, Hao, Juen, Mak, Richard, Oliphant, Raymond, Powezka, Katarzyna, Asaad, Peter, Downs, Karen, Hylton, Jackie, Jalali, Uzma, Math, Suraj, Kourounis, Georgios, Mcilveen, Erin, Ng, Hwei Jene, Pope, Oscar, Argyropoulos, Susannah, Faulkner, Gemma, Spurring, Eleanor, Anis, Fady, Javanmard-Emamghissi, Hannah, Lee, Rachel, Redfern, Victoria, Saravanan, Nivetha, Tierney, Gill, Cullen, William, Kantola, Venla, Massey, Lisa, Orabi, Amira, Park, Linda, Rajaretnam, Niroshini, Smart, Neil, Ambler, Olivia, Damaskos, Dimitrios, Ewing, Anne, Mehta, Maithili, Skipworth, Richard, Alagaratnam, Swethan, Chowdhury, Shihad, Gupta, Aayush, Jones, Gareth, Mohamed, Guleed, Varcarda, Massimo, Abdel-dayem, Mahmoud, Mazumdar, Eshan, Miller, Bethany, Shah, Parin, Gupta, Sapna, Hawkings, Nancy, Herbert, Geraint, Indika, Kalhar, Mallison, Georgia, Smith, Laurie, Tolley, Thomas, Williams, Gethin, Burton, Keira, Cavallaro, Davide, Henry, Jayde, Parkin, Edward, Redfern, Jennifer, Sekhar, Hema, Murray, Hannah, Redman, Amelia, Thompson, Dolapo, Thornton, Sophie, Blake, Natalie, Mcleod, Ross, Pressler, Marc, Read, Howard, Shehata, Zak, Thomas, Michael, Walker, Cerys, Brown, Steven, Daniels, Sarah, Hawkins, Debby, Steele, Caroline, Berry, David, Dimitrova, Nora, Massella, Virginia, Mathew, Priya, Patel, Rikhilroy, Bakewell, Zoe, Collins, Alma, Fowler, George, Lawday, Samuel, McCarthy, Kathryn, Sheldon, James, Papakonstantinou, Dimitrios, Cox, Kofi, Kenington, Cleo, Mitchell, Robert, Thrumurthy, Sri, Clifford, Rachael, Kalaiselvan, Ramya, Leptidis, Ioannis, Connolly, Thomas, Evans, William, Kumar, Anil, Malik, Isfand, Nulty, Callula, Rai, Sajal, Brown, Ashley, Chew, Misha, Okpala, Amalachukwu, Tan, Yanyu, Magee, Cathy, Rossborough, Catherine, Manda, Vijay, McColl, Gillian, Norton, William, Ray, Christopher, Abdelrahman, Byrne, Clare, Caddick, Virginia, Ghanem, Ahmed, Marchese, Salvatore, Patel, Sabina, Singh, Kaushiki, Smith, Eleanor, Zarog, Mohamed, Caswell, Jack, Lukaszewicz, Alex, Manson, David, McKnight, Gerard, Duncan, Trish, Brown, Leo, Lam Chan, Deona Mei, Robertson, John, Al-Aqaileh, Ahmad, Chandratreya, Nitya, El-qudah, Jazal, Philip, Ken, Ben Hmida, Rami, Chohda, Ezzat, Gilbert, Kayleigh, Alqallaf, Addullah, Kamarizan, Mohamad, Ben Sassi, Abozed, Amin, Mohamed, Lim, Michael, Longbotham, David, Moussa, Ahmed, Sheridan, Kelda, Wilkins, Alex, Carter, Ben, Hewitt, Jonathan, Price, Angeline, McLennan, Elizabeth, Knight, Stephen R., Reeves, Nicola, Chandler, Susan, Boyle, Jemma, Pearce, Lyndsay, and Moug, Susan J.

Published
2024
Full Text
View/download PDF

242. Determination of the macroscopic chloride diffusivity in cementitious by porous materials coupling periodic homogenization of Nernst-Planck equation with experimental protocol

Author

Olivier Millet, Abdelkarim Ait-Mokhtar, and Ouali Amiri

Subjects
Physics, QC1-999
Abstract

In this paper, we propose a macroscopic migration model for cementitious porous media obtained from periodic homogenization technique. The dimensional analysis of Nernst-Planck equation leads to dimensionless numbers characterizing the problem. According to the order of magnitude of the dimensionless numbers, the homogenization of Nernst-Planck equation leads at the leading order to a macroscopic model where several rates can be coupled or not. For a large applied electrical field accelerating the transfer of ionic species, we obtain a macroscopic model only involving migration. A simple experimental procedure of measurement of the homogenized chlorides diffusivity is then proposed for cement-based materials.

Published
2008
Full Text
View/download PDF

249. The 18th March, 2021 Bejaia (North-East Algeria) Earthquake Mw: 5.9

Author

Yelles-Chaouche, Abdelkarim, primary, Aidi, Chafik, additional, Beldjoudi, Hamoud, additional, Chami, Adel, additional, Chimouni, Redouane, additional, Abacha, Issam, additional, Boulahia, Oualid, additional, Mohammedi, Yahia, additional, Kherroubi, Abdelaziz, additional, and Belahouane, Athmane, additional

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results