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- 검색키워드
- 저자 : Ahmed A. Lotfy (검색결과 4 건)
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Fahmy, A.M.,Abdelslam, Ahmed K.,Lotfy, Ahmed A.,Hamad, Mostafa,Kotb, Abdelsamee The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2
Recently evolved power electronics' based domestic/residential appliances have begun to behave as single phase non-linear loads. Performing as voltage/current harmonic sources, those loads when connected to a three phase distribution network contaminate the line current with harmonics in addition to creating a neutral wire current increase. In this paper, an enhanced performance three phase four leg shunt active power filter (SAPF) controller is presented as a solution for this problem. The presented control strategy incorporates a hybrid predictive fuzzy-logic based technique. The predictive part is responsible for the SAPF compensating current generation while the DC-link voltage control is performed by a fuzzy logic technique. Simulations at various loading conditions are carried out to validate the effectiveness of the proposed technique. In addition, an experimental test rig is implemented for practical validation of the of the enhanced performance of the proposed technique.
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A. M. Fahmy,Ahmed K. Abdelslam,Ahmed A. Lotfy,Mostafa Hamad,Abdelsamee Kotb 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2
Recently evolved power electronics’ based domestic/residential appliances have begun to behave as single phase non-linear loads. Performing as voltage/current harmonic sources, those loads when connected to a three phase distribution network contaminate the line current with harmonics in addition to creating a neutral wire current increase. In this paper, an enhanced performance three phase four leg shunt active power filter (SAPF) controller is presented as a solution for this problem. The presented control strategy incorporates a hybrid predictive fuzzy-logic based technique. The predictive part is responsible for the SAPF compensating current generation while the DC-link voltage control is performed by a fuzzy logic technique. Simulations at various loading conditions are carried out to validate the effectiveness of the proposed technique. In addition, an experimental test rig is implemented for practical validation of the of the enhanced performance of the proposed technique.
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Elnemr, Gamal M,El-Rashidy, Ahmed H,Osman, Ahmed H,Issa, Lotfi F,Abbas, Osama A,Al-Zahrani, Abdullah S,El-Seman, Sheriff M,Mohammed, Amrallah A,Hassan, Abdelghani A Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2
Triple-negative breast cancers constitute about 15% of all cases, but despite their higher response to neoadjuvant chemotherapy, the tumors are very aggressive and associated with a poor prognosis as well as a higher risk of early recurrence. This study was retrospectively performed on 101 patients with stage II and III invasive breast cancer who received 6-8 cycles of neo-adjuvant chemotherapy. Out of the total, 23 were in the triple negative breast cancer subgroup. Nuclear Ki-67 expression in both the large cohort group (n=101) and triple negative breast cancer subgroup (n=23) and its relation to the pathological response were evaluated. The purpose of the study was to identify the predictive value of nuclear protein Ki-67 expression among patients with invasive breast cancers, involving the triple negative breast cancer subgroup, treated with neoadjuvant chemotherapy in correlation to the rate of pathological complete response. The proliferation marker Ki-67 expression was highest in the triple negative breast cancer subgroup. No appreciable difference in the rate of Ki-67 expression in triple negative breast cancer subgroup using either a cutoff of 14% or 35%. Triple negative breast cancer subgroup showed lower rates of pathological complete response. Achievement of pathological complete response was significantly correlated with smaller tumor size and higher Ki-67 expression. The majority of triple negative breast cancer cases achieved pathological partial response. The study concluded that Ki-67 is a useful tool to predict chemosensitivity in the setting of neoadjuvant chemotherapy for invasive breast cancer but not for the triple negative breast cancer subgroup.
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Al‐Hakimi Ahmed N.,Abdulghani Mahfoudh A.M.,Alhag Sadeq K.,Aroua Lotfi M.,Mahyoub Jazem A. 한국곤충학회 2022 Entomological Research Vol.52 No.3
The development of natural insecticide from plant products may have a beneficial effect as a promising candidate for practical strategies for controlling vector-borne diseases without current treatment. The present study was carried out to characterize green synthesized metallic nanomaterials for silver (Ag-NPs) and gold (Au-NPs) from extract leaf of Nerium oleander L., assess in vivo toxicity, and evaluate the larvicidal activity against Aedes aegypti. The prepared nanomaterials (Ag-NPs and Au-NPs) were characterized by Ultraviolet–Visible Spectroscopy (UV–Vi s ) , F o u r i e r transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and transmission electron microscopy (TEM). In addition, the subacute in vivo toxicity method was used to assess the extract and the nanomaterials (Ag-NPs and Au-NPs); in evaluating larvicidal activities using the World Health Organization (WHO) method. The Ag-NPs and Au-NPs were confirmed by shifting the absorption band in UV–Vi s , FTIR spectrums toward higher wavelengths. TEM and XRD analysis were revealed that the average particle size of Au-NPs and Ag-NPs showed 15.30 and 11.48 nm, respectively. In the toxicity experiment, no mortality or signs of toxicity were reported in all groups of treated animals; in larvicidal activity, the Au-NPs and Ag-NPs with LC50 36.0716 and 46.645 ppm respectively showed more effectiveness than leaf extract alone 108.1665 ppm. Collectively, extract leaf of N. oleander L. can be efficiently used to synthesize metallic nanomaterials with silver and gold, which can be adopted as a natural source of insecticide against Ae. aegypti.
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