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Wyszukujesz frazę "Ahmed, Ahmed" wg kryterium: Autor


Tytuł:
The impact of the reforms of the 2000s and the Arab Spring of 2011 on the performance of the Egyptian banking sector
Autorzy:
Ahmed, Ahmed L. M.
Powiązania:
https://bibliotekanauki.pl/articles/2048301.pdf
Data publikacji:
2021-08
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
Banks
Egyptian Banking Sector
Egyptian Revolution
Arab Spring
Opis:
This paper aims to assess the current condition of the Egyptian banking sector, based on the past reforms of the 2000s. This analysis is based on data from the Central Bank of Egypt (CBE), data from the Egyptian banking sector and the literature review. The main finding is that despite many changes in the political and economic scene that drove the country into a crisis, the Egyptian banking sector was able to work well in the post-2008 period, achieving high growth rates. This study contributes to the academic literature on factors influencing financial development in emerging counties, based on the analysis of the Egyptian banking.
Źródło:
Journal of Banking and Financial Economics; 2021, 1(15); 44-58
2353-6845
Pojawia się w:
Journal of Banking and Financial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of wood-derived biochar on the physico-mechanical and chemical characteristics of agricultural soils
Autorzy:
S.F. Ahmed, Ahmed
Raghavan, Vijaya
Powiązania:
https://bibliotekanauki.pl/articles/972584.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
biochar
particle size
proctor compaction
plasticity
soil workability
Opis:
Amendment of soil with biochar has been shown to enhance fertility and increase crop productivity, but the specific influence of biochar on soil workability remains unclear. Select physico-mechanical and chemical properties of clay loam and sandy loam soils were measured after amendment with wood-derived biochar of two particle size ranges (0.5-425 and 425-850 μm) at five dosages ranging from 0.5 to 10% dry weight. Whereas the clay loam soil workability decreased when the finer wood-derived biochar was applied at rates of 6 or 10%, soil fertility was not enhanced. The sandy loam soil, due to Proctor compaction, significantly decreased in bulk density with 6 and 10% wood-derived biochar amendments indicating higher soil resistance to compaction.
Źródło:
International Agrophysics; 2018, 32, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of wood-derived biochar on the compactibility and strength of silt loam soil
Autorzy:
Ahmed, Ahmed
Gariepy, Yvan
Raghavan, Vijaya
Powiązania:
https://bibliotekanauki.pl/articles/973197.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
biochar
particle size
bulk density
proctor
compaction
plastic and liquid limit
penetration resistance
soil
shear strength
Opis:
Biochar is proven to enhance soil fertility and increase crop productivity. Given that the influence of biochar on soil compaction remains unclear, selected physico-mechanical properties of soil amended with wood-derived biochar were assessed. For unamended silt loam, the bulk density, maximum bulk density, optimum moisture content, plastic limit, liquid limit, and plasticity index were 1.05 Mg m-3, 1.69 Mg m-3, 16.55, 17.1, 29.3, and 12.2%, respectively. The penetration resistance and shear strength of the unamended silt loam compacted in the standard compaction Proctor mold and at its optimum moisture content were 1800 kPa and 850 kPa, respectively. Results from amending the silt loam with 10% particle size ranges (0.5-212 μm) led to relative decreases of 18.1, 17.75, 66.66, and 97.4% in bulk density, maximum bulk density, penetration resistance, and shear strength, respectively; a 26.8% relative increase in optimum moisture content; along with absolute increases in plastic limit, liquid limit, and plasticity index of 5.3, 13.7, and 8.4%, respectively. While the biochar-amended silt loam soil was more susceptible to compaction, however, soil mechanical impedance enhanced.
Źródło:
International Agrophysics; 2017, 31, 2; 149-155
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cochlear Implantation in Children with Congenital Inner Ear Malformations
Autorzy:
Abbas, Azzam Muhsin
Hamed, Mustafa Salman
Ahmed, Ahmed Salah
Powiązania:
https://bibliotekanauki.pl/articles/27317603.pdf
Data publikacji:
2022-12-15
Wydawca:
Index Copernicus International
Tematy:
cochlear implantation
congenital inner ear malformation
facial nerve anomalies
Opis:
Introduction: Cochlear Implantation has proven beneficial in patients with profound congenital hearing impairments. Performing cochlear implantation in patients with inner ear malformation has always been a matter of dispute as congenitally deaf ears may have anatomical malformations and thus meet difficulties during operation. Therefore, it is important to focus on problems and complications encountered by surgeons performing such operations. Aim: To evaluate problems and surgical difficulties encountered in patients with congenital inner ear malformation, who underwent cochlear implantation. Material and methods: A series of 21 pediatric cochlear implant (CI) patients with known inner ear malformations determined on computed tomography (CT) of the temporal bone who underwent cochlear implantation in the Department of Otolaryngology of Martyr Ghazi Al-Hariri and AL-Yarmouk Teaching Hospital, Baghdad, Iraq, from January 2018 to January 2021. The study aimed to determine intraoperative adverse effects of these anomalies regarding electrode array insertion depths, predisposition to cerebrospinal fluid (CSF) leak through the cochleostomy, and associated facial nerve anomalies that can create problems with access to scala tympani. Results: The most common inner ear anomalies were wide vestibular aqueduct (15 patients, which makes 71.4%), incomplete partitions (5 patients, 23.8%), and common cavity (1 patient, 4.8%). As concerns CSF leak, the most common was CSF ooze (11 patients, 52.4%), CSF gusher (6 patients, 28.6%), and no CSF leak (4 patients, 19%). Among facial nerve anomalies there was only one case (4.8%) of abnormal position (more superficial and not injured) and 20 cases (95.2%) in which no anomaly was detected. As concerns electrode insertion depth, full insertion was achieved in 17 patients (81%), while incomplete insertion in 4 patients (19%). Conclusion: Cochlear implant can be successfully and safely inserted in patients with selected congenital inner ear anomalies. Surgery can be challenging in certain cases of gusher and facial nerve abnormalities, but proper radiology and good surgical technique will help avoid complications.
Źródło:
Polski Przegląd Otorynolaryngologiczny; 2022, 11, 4; 1-12
2084-5308
2300-7338
Pojawia się w:
Polski Przegląd Otorynolaryngologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positive integrable solutions for nonlinear integral and differential inclusions of fractional-orders
Autorzy:
Al-Issa, Shorouk
El-Sayed, Ahmed Mohamed Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/746526.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
integral inclusion
fractional-calculus
Caratheodory condition
differential inclusion
fixed point theorem
Opis:
In this paper we study the global existence of positive integrable solution for the nonlinear integral inclusion of fractional order \[ x(t) \in p(t) + I^\alpha F_1 (t, I^\beta f_2 (t, x(\varphi(t)))),\quad t \in (0, 1). \] As an application the global existence of the solution for the initial-value problem of the arbitrary (fractional) orders differential inclusion \[ \frac{dx(t)}{dt}\in p(t)+ I^\alphaF_1(t,D^\gammax(t))),\quad \text{a.e.}\ t gt 0 \] will be studied.
Źródło:
Commentationes Mathematicae; 2009, 49, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of salivary alpha amylase activity in smokers with periodontitis, Khartoum state, 2023
Autorzy:
Abd Alwhab Awad Allah, Fatima
Elrheima Ahmed, Hafsa Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/29519597.pdf
Data publikacji:
2023-12-31
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
alpha-amylase
periodontitis
saliva
smokers
Opis:
Introduction and aim. Smoking widely affect oral health, including its role in the development of periodontitis. Saliva contains an antioxidant system and various enzymes. The study was designed to evaluate the activity of salivary alpha amylase among individuals who smoke and have periodontitis. Material and methods. A total of 100 participants were included, with 50 cases (cigarette smokers with periodontitis) and the remaining 50 nonsmokers with healthy periodontium as the control group. Saliva samples were collected to measure salivary alpha amylase activity. Results. Smokers with periodontitis had significantly higher levels of salivary alpha amylase compared to the control group(177.96±14.5 vs 94.04±19.6 IU/mL, p<0.001). Additionally, there was a weak negative correlation between the level of alpha amylase and the age of the patients (p=0.01, r=0.376). However, no correlation was found between the level of alpha amylase and the duration of smoking (p=0.584, r=0.079). Conclusion. There is a significant increase in salivary alpha amylase levels among smokers with periodontitis. No correlation was found between age and salivary alpha amylase levels. However, a weak positive correlation was observed between the duration of smoking and salivary alpha amylase activity.
Źródło:
European Journal of Clinical and Experimental Medicine; 2023, 4; 692-695
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy system modelling to assess water quality for irrigation purposes
Autorzy:
Hamdan, Ahmed Naseh Ahmed
Al Saad, Zainb A. A.
Abu-Alhail, Saad
Powiązania:
https://bibliotekanauki.pl/articles/1841962.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
Fuzzy Inference System
irrigation water quality
Richard diagram
sodium adsorption ratio
Opis:
This study attempts to find a fuzzy logic system for assessing the quality of water in water treatment plants (WTPs) providing water for irrigation purposes in the Basrah Governorate (South of Iraq). Each month, samples are taken in each of six major WTPs to measure electrical conductivity (EC), and the content of sodium, magnesium and calcium. The calculated value which is the sodium adsorption ratio (SAR) is plotted with EC on the Richard diagram. SAR and EC values are combined together in a fuzzy inference system (FIS) to find out a quality number called the fuzzy irrigation water quality index number (FIWQI) which ranges from zero to one. The higher the value of the index, the better water quality. The Richard diagram, which helps to classify irrigation water, is used to adjust FIS components. Results show that the FIWQI for all WTPs changes depending on location and season. It ranges between 0.114–0.170, 0.120–0.190, 0.114–0.170, 0.114–0.202, 0.118–0.500 and 0.46–0.500 for Al-Bradhaia 1, Al-Jubaila 1, Shatt Al-Arab, Garmmah 1, Al-Rebat, and Old Shauaibah WTPs, respectively. The results indicate that WTPs effluent drawn from the Shatt Al-Arab River has poor water quality for irrigation purposes, except for an Old Shauaibah which receives water from another source called a sweet water canal. FIS results are compared with values obtained from the Richard diagram and 96% degree of compatibility between the two methods is attained. This indicates that FIS is an acceptable method for water quality classification.
Źródło:
Journal of Water and Land Development; 2021, 50; 98-107
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lung Cancer Risk Due to Radon in Different Brand Cigarette Tobacco in Iraqi Market
Autorzy:
Abdalsattar, Kareem Hashim
Ahmed Najam, Ahmed Najam
Abbas, Fadhel Hadi
Fadhil, Khaddam fuliful
Powiązania:
https://bibliotekanauki.pl/articles/1178355.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CR-39
Radon
effective dose
lung cancer
nuclear track detectors
tobacco
Opis:
Sealed can technique using CR-39 plastic track detector strippable has been used in order to measure radon concentrations to calculate the annual effective dose and lung cancer cases per year per million person for twenty different brand tobacco cigarette were collected from Iraqi market. Lung cancer is the leading cause of cancer-related deaths worldwide. Radon exposure is the second leading cause of lung cancer, following tobacco smoke. Radon is not only an independent risk factor; it also increases the risk of lung cancer in smokers. It has been observed that tobacco smoking increases the risks of radon-induced lung cancer. Radon and cigarette smoking have synergistic, multiplicative effect on lung cancer rates. People who inhale tobacco smoke are exposed to higher concentrations of radioactivity. Ever since studies on the relation of smoking to cancer, particularly the lung cancer has been established, there had been a great interest in studies concerned with the monitoring of the alpha radioactivity in tobacco. The results showed that the 222Rn concentrations in cigarette tobacco samples ranged from (156.450 to 403.087) Bq/m3 with an average 284.751 Bq/m3, while the radon induced lung cancer risks was found to vary from 71.047 to 183.049 with an av¬erage value of 129.3107 per million person, and standard deviation 83.529 and 37.932, respectively. Excellent correlation has been observed between radon concentration and lung cancer cases per year per million person for different brand tobacco cigarettes.
Źródło:
World Scientific News; 2017, 77, 2; 163-176
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vehicle-deck fires aboard RoPax ships: a comparison between numerical modelling and experimental results
Autorzy:
Salem, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/259491.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
vehicle-deck fires
RoPax ships
zone models
field models
model-scale fire tests
Opis:
According to an official study conducted by the IMO Correspondence Group on Casualty Analysis concerning the fire incidents that occurred on the vehicle-decks of RoPax ships, covering the period from 1994 to 2011, it has been shown that a very serious incident has occurred every other year since 2002, resulting in six constructive total losses. The results of this review shed the light on the need to investigate the application of fire models to simulate fire scenarios that may occur on the vehicle-decks aboard RoPax ships. This will be very useful for the RoPax designers who are willing to introduce new technologies or deviate from the current prescriptive regulations of fire safety design in order to reduce the risk of such catastrophic accidents. The aim of this paper is to present the results of a comparison between the predictions of three different fire models and the experimental results of a model-scale fire test that represents a fire scenario on a vehicle-deck aboard a RoPax ship. A statistical analysis technique was used to illustrate the ability of each fire model to predict five outputs of concern. The main conclusion of this comparison is that there is always an optimal fire model that can predict one or more of the five outputs of concern with results in good agreement with the measured values.
Źródło:
Polish Maritime Research; 2019, 2; 155-162
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crosstalk Noise Aware System For WDM-Based Optical Network on Chip
Autorzy:
Jedidi, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/225975.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical network on chip
wavelength division multiplexing
crosstalk noise
detection crosstalk
waveguide
optical router
Opis:
Network on chip (NoC) is presented as a promising solution to face off the growing up of the data exchange in the multiprocessor system-on-chip (MPSoC). However, the traditional NoC faces two main problems: the bandwidth and the energy consumption. To face off these problems, a new technology in MPSoC, namely, optical network-on-chip (ONoC) has been introduced which it uses the optical communication to guaranty a high performance in communication between cores. In addition, wavelength division multiplexing (WDM) is exploited in ONoC to reach a high rate of bandwidth. Nevertheless, the transparency nature of the ONoC components induce crosstalk noise to the optical signals, which it has a direct effect to the signal-to-noise ratio (SNR) then decrease the performance of the ONoC. In this paper, we proposed a new system to control these impairments in the network in order to detect and monitor crosstalk noise in WDM-based ONoC. Furthermore, the crosstalk monitoring system is a distributed hardware system designed and test with the different optical components according the various network topology used in ONoC. The register-transfer level (RTL) hardware design and implementation of this system can result in high reliability, scalability and efficiency with running time less than 20 ms.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 497-505
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Сотрудничество Турции с субъектами Российской Федерации в период 2000–2010 гг.
Autorzy:
Burak, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/568396.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Turkey
Russian Federation subjects
cooperation
Турция
Субъекты Российской Федерации
Сотрудничество
Opis:
In its 90 years of modern existence, Turkish foreign relations with Russia reflect contentious issues with which the two republics have grappled during the twentieth century and following the collapse of great empires, civil wars and radical changes in the international political system. Moreover, it is safe to say that the degree of constructiveness of these relations is directly dependent upon macropolitical processes in Eurasia, and that the success of foreign political contacts reflects the level of political and cultural thinking of state elites in both countries. One of the most important directions of Russian–Turkish bilateral relations is inter-regional cooperation on the subject of the Russian Federation and Turkey. This paper analyzes the main directions and pace of economic cooperation development between Turkey and Russia’s constituent entities, and evaluates the prospects of these relations.
За 90 лет существования современной Турции её внешнеполитические отношения с Россией отражали те актуальные проблемы, с которыми две республики столкнулись в ХХ в. после распада великих империй, гражданских войн и кардинальных изменений политического строя. Более того, можно с уверенностью сказать, что от степени конструктивности этих отношений напрямую зависели многие макрополитические процессы в Евразии, а успех внешнеполитических контактов отражал уровень политико–культурного мышления государственных элит двух стран. Одним из важнейших направлений российско–турецких двусторонних отношений является межрегиональное сотрудничество между субъектами Российской Федерации и турецкими вилайетами. В работе проанализированы основные направления и темпы развития экономического сотрудничества Турции с субъектами РФ, оцениваются перспективы этих отношений.
Źródło:
Nowa Polityka Wschodnia; 2016, 2(11); 25-42
2084-3291
Pojawia się w:
Nowa Polityka Wschodnia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological dual of $B_∞(I, ₁(X,Y))$ with application to stochastic systems on Hilbert space
Autorzy:
Ahmed, N.
Powiązania:
https://bibliotekanauki.pl/articles/729390.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
representation theory
topological dual
finitely additive operator-valued measures
polish space
Hilbert space
stochastic systems
structural control
uncertainty abatement
Opis:
In this paper, we prove that the topological dual of the Banach space of bounded measurable functions with values in the space of nuclear operators, furnished with the natural topology, is isometrically isomorphic to the space of finitely additive linear operator-valued measures having bounded variation in a Banach space containing the space of bounded linear operators. This is then applied to a stochastic structural control problem. An optimal operator-valued measure, considered as the structural control, is to be chosen so as to minimize fluctuation (volatility). Both existence of optimal policy and necessary conditions of optimality are presented including a conceptual algorithm.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2009, 29, 1; 67-90
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A relaxation theorem for partially observed stochastic control on Hilbert space
Autorzy:
Ahmed, N.
Powiązania:
https://bibliotekanauki.pl/articles/729417.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
partially observed control
infinite dimensional Hilbert space
relaxed controls
Zakai equation
Opis:
In this paper, we present a result on relaxability of partially observed control problems for infinite dimensional stochastic systems in a Hilbert space. This is motivated by the fact that measure valued controls, also known as relaxed controls, are difficult to construct practically and so one must inquire if it is possible to approximate the solutions corresponding to measure valued controls by those corresponding to ordinary controls. Our main result is the relaxation theorem which states that the set of solutions corresponding to ordinary controls is weakly dense in the set of solutions corresponding to relaxed controls. This is presented in Theorem 5.3 after giving some existence results on optimal controls for the infinite dimensional Zakai equation used for its proof.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2007, 27, 2; 295-314
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infinite dimensional uncertain dynamic systems on Banach spaces and their optimal output feedback control
Autorzy:
Ahmed, N.
Powiązania:
https://bibliotekanauki.pl/articles/729515.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
partially observed
uncertain systems
stochastic systems
operator valued functions
feedback operators
existence of optimal operators in the presence of uncertainty
Opis:
In this paper we consider a class of partially observed semilinear dynamic systems on infinite dimensional Banach spaces subject to dynamic and measurement uncertainty. The problem is to find an output feedback control law, an operator valued function, that minimizes the maximum risk. We present a result on the existence of an optimal (output feedback) operator valued function in the presence of uncertainty in the system as well as measurement. We also consider uncertain stochastic systems and present similar results on the question of existence of optimal feedback laws.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2015, 35, 1; 65-87
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stochastic evolution equations on Hilbert spaces with partially observed relaxed controls and their necessary conditions of optimality
Autorzy:
Ahmed, N.
Powiązania:
https://bibliotekanauki.pl/articles/729524.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
differential equations
Hilbert spaces
relaxed controls
optimal control
necessary conditions of optimality
Opis:
In this paper we consider the question of optimal control for a class of stochastic evolution equations on infinite dimensional Hilbert spaces with controls appearing in both the drift and the diffusion operators. We consider relaxed controls (measure valued random processes) and briefly present some results on the question of existence of mild solutions including their regularity followed by a result on existence of partially observed optimal relaxed controls. Then we develop the necessary conditions of optimality for partially observed relaxed controls. This is the main topic of this paper. Further we present an algorithm for computation of optimal policies followed by a brief discussion on regular versus relaxed controls. The paper is concluded by an example of a non-convex problem which is readily solvable by our approach.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2014, 34, 1; 105-129
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł

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