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Robustness of Generated Geometric Phase of
Quantum Wells in Two Open Waveguide-Coupled
Optical Cavities

Research Abstract
In this article, we study the geometric phase in a system formed by two spatially separated cavities interacting with the environment. Each cavity is lled by a linear optical medium and contains a quantum well. For different initial states, the robustness of the generated geometric phase is analyzed under the effects of the optical susceptibility, the dissipation of the cavities, the exciton-cavity and ber-cavity couplings. Our results show that the geometric phase is extremely sensitive to the effects of the cavity-exciton and the ber-cavity couplings as well as to the optical susceptibility. This opens new routes to understand the storage and manipulation of quantum data in a quantum network.
Research Authors
ABDEL-BASET A. MOHAMED
AHMED FAROUK
ABDEL-HALEEM ABDEL ATY
AND HICHEM ELEUCH
Research Department
Research Journal
IEEE ACCESS
Research Member
Research Pages
158745-158751
Research Publisher
IEEE
Research Rank
1
Research Vol
8
Research Website
https://ieeexplore.ieee.org/document/9176989
Research Year
2020

Mitigation of effect of salt stress on the nodulation, nitrogen fixation and growth of chickpea (Cicer arietinum L.) by triple microbial inoculation

Research Abstract
Plant-associated microorganisms play a critical role in agricultural productivity. Symbiotic microorganisms interact with each other and allow their host leguminous plants to maintain optimal nutrient levels and enhance their growth. Therefore, the goal of the current study was to investigate the synergistic interaction of different symbiotic microbes and its beneficial effect on the nodulation, nodule efficiency, and growth of salt-affected chickpea plants (Cicer arietinum L.). Rhizobium sp. (MK358859) was isolated from the root nodules of chickpea plants. In vitro, magnetite nanoparticles (Fe3O4-NPs) at a concentration of 150 μg/ml significantly enhanced the growth ofRhizobium compared with bulk FeCl3. The impact of seven soil salinity levels (0, 25, 50, 75, 100, 150, and 200 mM NaCl) on germination and subsequent growth was measured. The salinity levels ranging from 25 to 150 mM significantly inhibited the growth of chickpea plants, while the 200 mM level hindered their germination. The influence of triple microbial inoculation of chickpea plants grown in soil with 0, 75 and 150 mM NaCl was studied. Inoculation with mycorrhizal fungi, Fe3O4 NP-inducedRhizobium, and endophytic Stenotrophomonas maltophilia significantly improved the nodulation, leghaemoglobin content, nitrogenase activity, and growth of chickpea grown at salinity level of 75 and 150 mM compared with the controls. The mitigation of the destructive effect of salinity stress was due to improvement in the nutritional status of plants as determined by their K, P, carbohydrate and protein contents. Such triple microbial inoculation could be a successful bio-fertilizer that can contribute to protecting chickpea plants from salinity by attenuating salt-induced oxidative damage.
Research Authors
Mohamed Hemida Abd-Alla, Nivien A Nafady, Shymaa R Bashandy, Amany A Hassan
Research Journal
Rhizosphere
Research Member
Research Pages
PP. 100148
Research Publisher
NULL
Research Rank
1
Research Vol
Vol. 10
Research Website
NULL
Research Year
2019

Mitigation of effect of salt stress on the nodulation, nitrogen fixation and growth of chickpea (Cicer arietinum L.) by triple microbial inoculation

Research Abstract
Plant-associated microorganisms play a critical role in agricultural productivity. Symbiotic microorganisms interact with each other and allow their host leguminous plants to maintain optimal nutrient levels and enhance their growth. Therefore, the goal of the current study was to investigate the synergistic interaction of different symbiotic microbes and its beneficial effect on the nodulation, nodule efficiency, and growth of salt-affected chickpea plants (Cicer arietinum L.). Rhizobium sp. (MK358859) was isolated from the root nodules of chickpea plants. In vitro, magnetite nanoparticles (Fe3O4-NPs) at a concentration of 150 μg/ml significantly enhanced the growth ofRhizobium compared with bulk FeCl3. The impact of seven soil salinity levels (0, 25, 50, 75, 100, 150, and 200 mM NaCl) on germination and subsequent growth was measured. The salinity levels ranging from 25 to 150 mM significantly inhibited the growth of chickpea plants, while the 200 mM level hindered their germination. The influence of triple microbial inoculation of chickpea plants grown in soil with 0, 75 and 150 mM NaCl was studied. Inoculation with mycorrhizal fungi, Fe3O4 NP-inducedRhizobium, and endophytic Stenotrophomonas maltophilia significantly improved the nodulation, leghaemoglobin content, nitrogenase activity, and growth of chickpea grown at salinity level of 75 and 150 mM compared with the controls. The mitigation of the destructive effect of salinity stress was due to improvement in the nutritional status of plants as determined by their K, P, carbohydrate and protein contents. Such triple microbial inoculation could be a successful bio-fertilizer that can contribute to protecting chickpea plants from salinity by attenuating salt-induced oxidative damage.
Research Authors
Mohamed Hemida Abd-Alla, Nivien A Nafady, Shymaa R Bashandy, Amany A Hassan
Research Journal
Rhizosphere
Research Member
Research Pages
PP. 100148
Research Publisher
NULL
Research Rank
1
Research Vol
Vol. 10
Research Website
NULL
Research Year
2019

Mitigation of effect of salt stress on the nodulation, nitrogen fixation and growth of chickpea (Cicer arietinum L.) by triple microbial inoculation

Research Abstract
Plant-associated microorganisms play a critical role in agricultural productivity. Symbiotic microorganisms interact with each other and allow their host leguminous plants to maintain optimal nutrient levels and enhance their growth. Therefore, the goal of the current study was to investigate the synergistic interaction of different symbiotic microbes and its beneficial effect on the nodulation, nodule efficiency, and growth of salt-affected chickpea plants (Cicer arietinum L.). Rhizobium sp. (MK358859) was isolated from the root nodules of chickpea plants. In vitro, magnetite nanoparticles (Fe3O4-NPs) at a concentration of 150 μg/ml significantly enhanced the growth ofRhizobium compared with bulk FeCl3. The impact of seven soil salinity levels (0, 25, 50, 75, 100, 150, and 200 mM NaCl) on germination and subsequent growth was measured. The salinity levels ranging from 25 to 150 mM significantly inhibited the growth of chickpea plants, while the 200 mM level hindered their germination. The influence of triple microbial inoculation of chickpea plants grown in soil with 0, 75 and 150 mM NaCl was studied. Inoculation with mycorrhizal fungi, Fe3O4 NP-inducedRhizobium, and endophytic Stenotrophomonas maltophilia significantly improved the nodulation, leghaemoglobin content, nitrogenase activity, and growth of chickpea grown at salinity level of 75 and 150 mM compared with the controls. The mitigation of the destructive effect of salinity stress was due to improvement in the nutritional status of plants as determined by their K, P, carbohydrate and protein contents. Such triple microbial inoculation could be a successful bio-fertilizer that can contribute to protecting chickpea plants from salinity by attenuating salt-induced oxidative damage.
Research Authors
Mohamed Hemida Abd-Alla, Nivien A Nafady, Shymaa R Bashandy, Amany A Hassan
Research Journal
Rhizosphere
Research Member
Research Pages
PP. 100148
Research Publisher
NULL
Research Rank
1
Research Vol
Vol. 10
Research Website
NULL
Research Year
2019

Composition dependent electrocatalytic activity of Ni(OH)2-graphene hybrid catalyst deposited by one-step vacuum kinetic spray technique

Research Abstract
and hydrogen evolution reaction (HER) were deposited on Ni foam from low cost and abundant micro-sized particles of Ni(OH)2 and graphite powders using modified vaccum spray technique. The deposited thin films exhibited a mixed morphology of nanosheets and nanoflakes. We investigated the effect of increasing Ni(OH)2 content on the electrocatalytic activity toward the OER and the HER in 1 M KOH. We found that the hybrid catalyst with low Ni(OH)2 content (20 wt.%) revealed a high OER electrocatalytic activity that delivers 50 mA·cm-2 at an overpotential of 330 mV with a low Tafel slope of 78 mV·dec-1. Meanwhile, catalysts with higher Ni(OH)2 content (80 wt.%) exhibited superior HER activity that delivered 20 mA·cm-2 at an overpotential of 154 mV and a low Tafel slope of 92 mV·dec-1. The long term stability for both working electrodes was verified up to 25 hours
Research Authors
A. G. Abd-Elrahim, Mohaned M. M. Mohammed, Doo-Man Chun
Research Department
Research Journal
Materials Chemistry and Physics
Research Pages
122675
Research Publisher
Elsevier
Research Rank
1
Research Vol
Volume 244, 1 April 2020
Research Website
https://doi.org/10.1016/j.matchemphys.2020.122675
Research Year
2020

Composition dependent electrocatalytic activity of Ni(OH)2-graphene hybrid catalyst deposited by one-step vacuum kinetic spray technique

Research Abstract
and hydrogen evolution reaction (HER) were deposited on Ni foam from low cost and abundant micro-sized particles of Ni(OH)2 and graphite powders using modified vaccum spray technique. The deposited thin films exhibited a mixed morphology of nanosheets and nanoflakes. We investigated the effect of increasing Ni(OH)2 content on the electrocatalytic activity toward the OER and the HER in 1 M KOH. We found that the hybrid catalyst with low Ni(OH)2 content (20 wt.%) revealed a high OER electrocatalytic activity that delivers 50 mA·cm-2 at an overpotential of 330 mV with a low Tafel slope of 78 mV·dec-1. Meanwhile, catalysts with higher Ni(OH)2 content (80 wt.%) exhibited superior HER activity that delivered 20 mA·cm-2 at an overpotential of 154 mV and a low Tafel slope of 92 mV·dec-1. The long term stability for both working electrodes was verified up to 25 hours
Research Authors
A. G. Abd-Elrahim, Mohaned M. M. Mohammed, Doo-Man Chun
Research Department
Research Journal
Materials Chemistry and Physics
Research Pages
122675
Research Publisher
Elsevier
Research Rank
1
Research Vol
Volume 244, 1 April 2020
Research Website
https://doi.org/10.1016/j.matchemphys.2020.122675
Research Year
2020

Nanosized Co3O4–MoS2 heterostructure electrodes for improving the oxygen
evolution reaction in an alkaline medium

Research Abstract
Nano-sized Co3O4–MoS2/Ni foam heterostructure electrodes were fabricated using a vacuum kinetic spray technique with microparticles of Co3O4 and MoS2. The deposited films were utilized to study the oxygen evolution reaction (OER) at various MoS2 contents (25, 50, 75 wt%). The surface state of the obtained heterostructure electrodes was characterized using various surfaces sensitive techniques such as scanning electron microscopy (SEM), Raman spectroscopy, and x-ray photoelectron spectroscopy (XPS). SEM images exhibited the fragmentation of the microparticles to smaller sizes in the nanoscale range. An analysis of the XPS spectra revealed the improvement in the cumulative synergy between the nanostructured Co3O4 and MoS2 in the heterostructured Co3O4–MoS2 electrocatalyst. We found that the gradual addition of MoS2 caused an enhancement in the OER activity due to improved charge transfer kinetics. Moreover, the heterostructure electrode with 75 wt% MoS2 showed the highest activity with the lowest OER overpotential value of 298 mV at 10 mA cm−2 and the smallest Tafel slope value of 46 mV·dec−1, as well as, 50 h OER stability at a current density of 50 mA cm−2.
Research Authors
A.G. Abd-Elrahim, Doo-Man Chun
Research Department
Research Journal
Journal of Alloys and Compounds
Research Pages
156946
Research Publisher
Elsevier
Research Rank
1
Research Vol
Volume 853, 5 February 2021
Research Website
https://doi.org/10.1016/j.jallcom.2020.156946
Research Year
2020

Radiological hazard parameters of natural radionuclides
for neoproterozoic rocks from Wadi Um Huytat in central eastern
desert of Egypt

Research Abstract
NULL
Research Authors
Ghada Salaheldin1
· Abdullah Tolba2
· Mostafa Kamel2
· Atef El‑Taher3
Research Department
Research Journal
Journal of Radioanalytical and Nuclear Chemistry
Research Pages
NULL
Research Publisher
NULL
Research Rank
1
Research Vol
NULL
Research Website
NULL
Research Year
2020

Analysis of alpha+11B elastic and inelastic scattering using microscopic and semi-microscopic representations

Research Abstract
In the present study angular distributions of the differential cross section for elastic and inelastic scattering of alpha (α)-particles of 11В nuclei at different bombarding energies have been analyzed in the framework of the optical model (OM) potential. Two OM folding approaches were adopted in order to construct the real part of the α-nucleus potential. First, we generated the semi-microscopic single folding (SF) potential by folding an effective α-nucleon (α-N) interaction over the nuclear matter density of the target (11B) nucleus. In addition, the double folding (DF) approach was employed in order to deduce a microscopic representation of the optical potential by folding an effective density-dependent (DDM3Y) nucleon–nucleon interaction over the matter densities of the colliding nuclei. Successful theoretical predictions of six sets of experimental elastic scattering data have been obtained over the whole measured angular range. However, it was found that introducing real renormalization coefficients (~0.9–1.6) is essential in order to obtain best fits with data. On the other side, sixteen sets of the inelastic scattering data at several excited states of 11B nucleus were analyzed using the constructed SF and DF deformed potentials. In general, reasonable description of the data is obtained. However underestimated predictions of data were obtained at backward measured angles. The deduced reaction (absorption) cross sections and nuclear deformation lengths were also investigated.
Research Authors
S. R. Mokhtar, A. A. Ebrahim, M. I. Ahmed, and M. El-Azab Farid
Research Department
Research Journal
Physica Scripta
Research Pages
055305
Research Publisher
NULL
Research Rank
1
Research Vol
Vol. 95 - NO. 5
Research Website
NULL
Research Year
2020

Analysis of alpha+11B elastic and inelastic scattering using microscopic and semi-microscopic representations

Research Abstract
In the present study angular distributions of the differential cross section for elastic and inelastic scattering of alpha (α)-particles of 11В nuclei at different bombarding energies have been analyzed in the framework of the optical model (OM) potential. Two OM folding approaches were adopted in order to construct the real part of the α-nucleus potential. First, we generated the semi-microscopic single folding (SF) potential by folding an effective α-nucleon (α-N) interaction over the nuclear matter density of the target (11B) nucleus. In addition, the double folding (DF) approach was employed in order to deduce a microscopic representation of the optical potential by folding an effective density-dependent (DDM3Y) nucleon–nucleon interaction over the matter densities of the colliding nuclei. Successful theoretical predictions of six sets of experimental elastic scattering data have been obtained over the whole measured angular range. However, it was found that introducing real renormalization coefficients (~0.9–1.6) is essential in order to obtain best fits with data. On the other side, sixteen sets of the inelastic scattering data at several excited states of 11B nucleus were analyzed using the constructed SF and DF deformed potentials. In general, reasonable description of the data is obtained. However underestimated predictions of data were obtained at backward measured angles. The deduced reaction (absorption) cross sections and nuclear deformation lengths were also investigated.
Research Authors
S. R. Mokhtar, A. A. Ebrahim, M. I. Ahmed, and M. El-Azab Farid
Research Department
Research Journal
Physica Scripta
Research Member
Research Pages
055305
Research Publisher
NULL
Research Rank
1
Research Vol
Vol. 95 - NO. 5
Research Website
NULL
Research Year
2020
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