Multiple-Model Adaptive Control for Interval Plants

Tamer Ahmed Nasr,Hossam A. Abdel Fattah,Adel A. R. Hanafy 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.1

Multiple-Model Adaptive Control (MMAC) is usually considered suitable for Interval Plants. This pa-per proposes a multiple model adaptive controller for first order interval plant with large delays. The number of models to be used is investigated and the controller parameters tuning is studied. The proposed scheme is applied to a numerical example for illustration. Simulation results show the applicability of the method.

Is the RCEP a Cornerstone or Just Collaboration? Regional General Equilibrium Model Based on GAMS

Yosri Nasr Ahmed,Huang Delin,Benito Giovanni Reeberg,Victor Shaker 한국무역학회 2020 Journal of Korea trade Vol.24 No.1

Purpose – This paper investigates the potential effect of the Regional Comprehensive Economic Partnership (RCEP) on trade liberalization among member countries in order to answer key questions in our research on whether the RCEP will be a cornerstone or just collaboration. Furthermore, it aims to measure the likely magnitude of the economic impact it has on its members. Design/methodology – Toward achieving research objectives, we developed a regional CGE model based on the GTAP 9 database. Findings – The simulation results show Korea, Australia, India, and Japan ranked the top countries with an average growth in GDP of 0.38 %, 0.36%, 0.29%, and 0.23%, respectively. Moreover, China and New Zealand followed with a percentage of 0.12% each. The lower economic performing group is the ASEAN group due to a contraction in GDP by 0.13%. Accordingly, there was a positive impact of the RCEP agreement on all member states, as empirically demonstrated. Furthermore, Korea is one of the countries that will benefit most from joining this agreement. Finally, this agreement is important; it has many economic benefits to member states, but it is not a cornerstone. Originality/value – The examination of the quantitative effects of tariff removal among the RCEP s countries is its value. We will address all member countries of the convention simultaneously using a regional CGE model GAMS language, where we employed a Mathematical Programming System for General Equilibrium (MPSGE) to establish a Regional CGE model. This study is directed to policymakers looking at evaluating RCEP agreement.

Green tea ameliorates the side effects of the silver nanoparticles treatment of Ehrlich ascites tumor in mice

Ahmed Magdy,Emad Sadaka,Nemany Hanafy,Mohammed A. El‑Magd,Nasr Allahloubi,Maged El Kemary 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.3

Background Silver nanoparticles (AgNPs) have anti-cancer effects with fewer side effects than standard chemotherapeutic agents, however, they exert oxidative stress-based adverse effects on normal cells and so their applications have raised concern about possible health and environmental risks. Objective We evaluated whether green tea extract (GTE), which contains potent antioxidants, could ameliorate AgNPs geno-, cyto-, and histotoxicities without decreasing their therapeutic potential against Ehrlich ascetic carcinoma (EAC). Results GTE enhanced the anti-cancer effect of AgNPs against EAC cells and ameliorated the genotoxic effect of AgNPs as indicated by lowering chromosomal aberrations and micronucleus frequencies. Additionally, GTE relieved most of degenerative histological changes induced by AgNPs. GTE restored the increased MDA and the decreased SOD, GPx and CAT serum levels induced by AgNPs to levels comparable to normal. The pre-treatment with GTE and AgNPs showed better improvement than the post-treatment strategy. Conclusions GTE can not only ameliorate AgNPs-induced adverse effects but also improve their anti-cancer effect against EAC. So, it could be useful in the treatment of liver dysfunction associated with AgNPs.

Intercropping of Cow Pea (Vigna unguiculata) as Summer Forage Yield with Grewia tenax in Irrigated Saline Soil of Khartoum State, Sudan

Nasre Aldin Mustafa Abdalla,Seid Ahmed Hussein Alawad,Ballal Mohamed ElMukhtar 강원대학교 산림과학연구소 2022 Journal of Forest Science Vol.38 No.2

Agroforestry in terms of intercropping cow pea as summer forage with Grewia tenax was undertaken under sub -irrigation system in two consecutive seasons of 2017 and 2018 in saline soil of Khartoum State of Sudan. The aims were to find out suitable agro forestry system for saline soils as well as to investigate effect of tree spacing on field summer forage crop under semi -irrigation system. Therefore G. tenax trees that spaced at 4×4 m were used as main factor versus cow pea crop that incorporated at 25×50 cm intervals by using completely randomized block design with 3 replications. Trees and crop parameters were determined in terms of plant growth and yield. In addition to land equivalent ratio and soil chemical and physical properties at different layers were determined. The results revealed that, soil parameters in terms of CaCo₃, SAR, ESP, pH paste and EC ds/m were increased with increasing soil depths. Meanwhile tree growth did not show any significant differences in the first season in 2017. Whereas in the second season in 2018 tree growth namely; tree height, tree collar and canopy diameters were higher under intercropping than in sole trees. Cow pea plant height recorded significant differences under sole crop in the first season in 2017. Unlike the forage fresh yield that was significant under the inter cropped plots. Tree fruit yield was higher under sole trees and land equivalent ratio was more advantageous under GS2 (1.5 m) which amounted to 4. Therefore it is possible to introduce this agroforestry system under saline soils to provide summer forage of highly nutritive value to feed animals and to increase farmers’ income as far as to halt desertification and to sequester carbon.

Continuous biohydrogen production from starch wastewater via sequential dark-photo fermentation with emphasize on maghemite nanoparticles

Mahmoud Nasr,Ahmed Tawfik,Masaaki Suzuki,Sheena Kumari,Faizal Bux 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

Hydrogen production from starch wastewater via sequential dark-photo fermentation process wasinvestigated. Two anaerobic baffled reactors (ABRs) were operated in parallel at an OLR of 8.11 0.97 g-COD/L/d, and a HRT of 15 h. ABR-1 and ABR-2 was inoculated with pre-treated sludge and sludgeimmobilized on maghemite nanoparticles, respectively. Better hydrogen yield of 104.75 12.39 mL-H2/g-COD-removed was achieved in ABR-2 as compared to 66.22 4.88 mL-H2/g-COD-removed in ABR-1. Theeffluent of ABR-2 was used for further hydrogen production by photo fermentation in ABR-3. An overallhydrogen yield of 166.83 27.79 mL-H2/g-COD-removed was achieved at a total HRT of 30 h. 16S rRNAphylogeny showed that Clostridium and Rhodopseudomonas palustris species were dominant in ABR-1, ABR-2and ABR-3, respectively.

Nasal septal anatomical variations among Saudi population and their possible coincidence with sinusitis: a computed tomography scan study

Gisma Ahmed Madani,Wael Amin Nasr El-Din,Asmaa S. Essawy,Khamrunissa Hussain,Islam Omar Abdel Fattah 대한해부학회 2022 Anatomy & Cell Biology Vol.55 No.4

The nasal septum is a crucial supporting factor for the nasal cavity and may develop several anatomical variants including septal deviation, spur and pneumatization. These variants could be associated with a higher incidence of sinusitis due to structural and functional alterations. So, the aim of this study was to assess the prevalence of nasal septal deviation (NSD), nasal septal spur (NSS) and nasal septal pneumatization (NSP) among the Saudi adult population and their links with the incidence of sinusitis by using computed tomography (CT). A retrospective study was achieved over a twenty-two months period on 681 adult Saudi subjects (420 males and 261 females) aged 20 years or older, referred for coronal CT evaluation of the paranasal sinuses. NSD and NSS were significantly more prevalent in males than females (80.0% vs. 67.4% respectively for NSD, and 34.5% vs. 24.9% respectively for NSS), while there was no statistical difference in frequency of NSP regarding gender (P=0.670). The incidence of sinusitis was significantly higher in presence of NSD and/or NSS (P<0.001 for both). On the contrary, NSP was not associated with a significant increase in the prevalence of sinusitis (P=0.131). In conclusion, NSD and NSS are more prevalent in males than females among the Saudi population with no statistical difference between both genders regarding the presence of septal pneumatization. Furthermore, sinusitis is more prevalent with the occurrence of NSD and NSS, and not related to the incidence of NSP.

Fatigue wear of polyamides with surface defects under different loading conditions

Abdelbary, Ahmed,Nasr, Mohamed N.A. Techno-Press 2016 Advances in materials research Vol.5 No.3

Compared to metal-to-metal tribology, polymer tribology presents further complexity as it is more prone to be influenced by operating conditions. Over the past two decades, progress in the field of wear of polymers has led to the establishment of more refined wear mechanisms. The current paper establishes the link between different load parameters and the wear rate of polymers, based on experimental investigations. A pin-on-plate reciprocating tribometer was used to examine the wear behaviour of polyamide sliding against a steel counterface, under constant and fluctuating loads, in dry conditions. In addition, the influence of controlled imperfections in the polymer surface upon its wear rate were examined, under cyclic and steady loading, in order to better understand surface fatigue wear of polymers. The imposed imperfections consisted of vertical artificial deep crack (slit) perpendicular or parallel to the direction of sliding. The study concludes with the followings findings; in general, wear of polymers shows a significant tendency to the type of applied load. Under cyclic loads, polymers show an increase in wear rate compared to those tested under static loads. Such increase was found to increase with the increase in cyclic load frequency. It is also demonstrated that surface cracks results in higher wear rates, particularly under cyclic loads.

Prevalence of the anatomical variations of concha bullosa and its relation with sinusitis among Saudi population: a computed tomography scan study

Wael Amin Nasr El-Din,Gisma Ahmed Madani,Islam Omar Abdel Fattah,Esmat Mahmoud,Asmaa S. Essawy 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.2

Concha bullosa (CB) is a pneumatic cavitation inside a concha in the nasal cavity. It is one of the most widely recognized nasal variations and is mostly found in the middle concha. CB is divided according to its site into three types; lamellar, bulbous and extensive. The goal of our study was to estimate the prevalence of CB among Saudi adult population and its association with sinusitis by using multidetector computed tomography (MDCT). This was a retrospective study carried out over a three-year period on 879 adult Saudi patients aged 18 years or older, referred for MDCT assessment of paranasal sinuses. Males were 540 and females were 339. Patients with facial congenital anomalies or nasal trauma were excluded from our study. CB was prevalent in both males and females among Saudi population (55.4%, 55.7%) respectively. Bilateral CB (55.5%) was more frequent than unilateral (44.5%). Extensive CB (44.0%) was the most frequent type. Sinusitis was associated more in patients with CB (48.0%) versus those who have no CB (5.9%). In conclusion, CB was prevalent among Saudi population and the most frequently recorded is the extensive type. Furthermore, the most common type associated with sinusitis was extensive CB (49.6%).

Ziziphus spina christi for Sustainable Agroforestry Farming in Arid Land of Khartoum State of Sudan

Mustafa Abdalla Nasre Aldin,Hussein Alawad Seid Ahmed,Mohamed El Mukhtar Ballal,Adil Mahgoub Farah 강원대학교 산림과학연구소 2023 Journal of Forest Science Vol.39 No.1

Cow pea (Vigna unguiculata) was intercropped with Ziziphus spina-christi as summer forage in two consecutive seasons of 2017 and 2018. The aims to find out suitable agroforestry practice for saline soils of Khartoum State. And to investigate effect of tree spacing on forage biomass yield under semi -irrigated systems. Completely randomized block design with 3 replicates was conducted for this trial. Thus Z.spina-christi that fixed at 4×4 m was intercropped with cowpea at 1 m and 1.5 m spacing from trees trunk. Tree growth parameters were measured in terms of tree height, tree collar diameter, tree crown diameter and fruit yield per tree. While crop were parameters were determined in terms of plant height, number of plant, forage biomass yield per ha and land equivalent ratio. Soil profile of 1×1 m and 1.5 m depth was excavated and its features were described beside its chemical and physical properties were analyzed for 0-10 cm, 0-30 cm, and 30-60 cm and 60-100 cm layers. The results revealed that soil pH, CaCO3, SAR, ESP, and EC ds/m were increased by increasing soil depths. Meanwhile tree growth in terms of tree height was significant in the first season 2017 when compared with tree collar diameter and tree crown diameter. Also significant differences were recorded for tree growth when compared with sole trees in the second season in 2018. Tree fruit showed marked variations between the two seasons, but it was higher under intercropping particularly at ZS2. Crop plant height was highly significant under sole cropping than intercropping in first season in 2017. In contrast forage biomass yield was significant under intercropping in ZS1 and ZS2 treatments. Land equivalent ratio was advantageous under this agroforestry system particularly under ZS2. Thus it recorded 5 and 9 for ZS2 in the two consecutive seasons respectively. Therefore, it is feasible to introduce this agroforestry system under such arid lands to provide summer forage yield of highly nutritive value and low cost for animals feed as well as to increase farmers’ income and to halt desertification and to sequester carbon.

Kinetics and isotherm studies of methylene blue adsorption onto polyaniline nanotubes base/silica composite

Mohamad M. Ayad,Ahmed Abu El-Nasr,Jaroslav Stejskal 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6

A cationic dye, such as methylene blue (MB), was adsorbed from water by using polyaniline nanotubes (PANI NTs) base/silica composite as adsorbent. Experiments were conducted by using the UV–visible spectroscopy and by varying parameters namely: initial concentration of MB and contact time. The percentage of color removal decreased with increase of initial dye concentration. Equilibrium data were fit to Langmuir isotherm. The Langmuir isotherm fits best the MB adsorption data on PANI NTs base/silica composite. The kinetic models: pseudo first order, pseudo-second order and the intraparticle diffusion models were applied to the experimental data. It was observed that pseudo-second order kinetic model described the adsorption process better than any other kinetic models. Results obtained indicate that PANI NTs base/silica composite could be employed as an efficient adsorbent much more than the conventional PANI base/silica composite powder for dye uptake.