Skocz do pozycji: 1.

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

/5

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Skocz do pozycji: 2.

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

/5

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Skocz do pozycji: 3.

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

/5

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Skocz do pozycji: 4.

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

/5

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Skocz do pozycji: 5.

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

/5

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Skocz do pozycji: 6.

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

/5

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Skocz do pozycji: 7.

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

/5

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Skocz do pozycji: 8.

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

/5

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Skocz do pozycji: 9.

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

/5

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Skocz do pozycji: 10.

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

/5

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Skocz do pozycji: 11.

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

/5

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Skocz do pozycji: 12.

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

/5

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Skocz do pozycji: 13.

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

/5

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Skocz do pozycji: 14.

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

/5

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Skocz do pozycji: 15.

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

/5

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Skocz do pozycji: 16.

Tytuł:

Optimal control of impulsive stochastic evolution inclusions

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729552.pdf

Data publikacji:

2002

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

impulsive perturbations
C₀-semigroups
stochastic systems
differential inclusions
vector measures
optimal controls

Opis:

In this paper, we consider a class of infinite dimensional stochastic impulsive evolution inclusions driven by vector measures. We use stochastic vector measures as controls adapted to an increasing family of complete sigma algebras and prove the existence of optimal controls.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2002, 22, 2; 155-184
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

A general class of McKean-Vlasov stochastic evolution equations driven by Brownian motion and Lèvy process and controlled by Lèvy measure

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729570.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

McKean-Vlasov stochastic differential equation
Hilbert spaces
existence of optimal controls

Opis:

In this paper we consider McKean-Vlasov stochastic evolution equations on Hilbert spaces driven by Brownian motion and L`evy process and controlled by L`evy measures. We prove existence and uniqueness of solutions and regularity properties thereof. We consider weak topology on the space of bounded Le´vy measures on infinite dimensional Hilbert space and prove continuous dependence of solutions with respect to the Le´vy measure. Then considering a certain class of Le´vy measures on infinite as well as finite dimensional Hilbert spaces, as relaxed controls, we prove existence of optimal controls for Bolza problem and some simple mass transport problems

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2016, 36, 2; 181-206
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 18.

Tytuł:

Measure valued solutions for stochastic evolution equations on Hilbert space and their feedback control

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729584.pdf

Data publikacji:

2005

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

stochastic differential equations
Hilbert space
measurable vector fields
finitely additive measure solutions
optimal feedback controls

Opis:

In this paper, we consider a class of semilinear stochastic evolution equations on Hilbert space driven by a stochastic vector measure. The nonlinear terms are assumed to be merely continuous and bounded on bounded sets. We prove the existence of measure valued solutions generalizing some earlier results of the author. As a corollary, an existence result of a measure solution for a forward Kolmogorov equation with unbounded operator valued coefficients is obtained. The main result is further extended to cover Borel measurable drift and diffusion which are assumed to be bounded on bounded sets. Also we consider control problems for these systems and present several results on the existence of optimal feedback controls.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2005, 25, 1; 129-157
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 19.

Tytuł:

Radial Wrist Extensors as a Dynamic Stabilizers of Scapholunate Complex

Autorzy:

Elsaftawy, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/1396200.pdf

Data publikacji:

2013-08-01

Wydawca:

Index Copernicus International

Tematy:

scapholunate instability
scapholunate dissociation
rotatory subluxation of the scaphoid
radial wrist extensors
flexor carpi radialis
dynamic stabilizers

Opis:

Wrist stabilization is ensured by the complex of stabilizers, both static (intrinsic and extrinsic ligaments) and dynamic ones (flexor and extensor sinews of the wrist). Extrinsic carpal ligaments link both carpal rows with forearm, while the intrinsic ones connect individual carpal bones. From among intrinsic ligaments, the most significant from clinical point of view is scapholunate ligament (scapholunate lig. - SL). Instability of the SL resulting from SL ligament tear is the most frequent type of carpal instability. If untreated or undiagnosed, it may lead to destabilization of the carpal rows, and in the final stage to massive degenerative changes with SLAC (scapholunate advanced collapse). The aim of the study was to present a hypothesis of a possible influence of radial extensors of the wrist as dynamic stabilizers for SL complex, based on which it is possible to discern the partial ligament tear with accompanying damage of static stabilizers of the complex. Material and methods. This hypothesis was based on radiological tests carried out on 5 patients, with acute partial SL ligament tear, which was confirmed during wrist arthroscopy. The outcome was presented as well, with its visualization in radiological tests. Results. The picture of rotary subluxation of the scaphoid -signet ring sign in PA view and strengthening in stress position (clenched fist) was demonstrated in all 5 patients. In 2 patients who had wrist arthroscopy performed it was observed that the palmar and proximal part of SL ligament were injured, yet no damage of dorsal part was reported. In MRI tests of these patients, an additional injury of dorsal intercarpal ligament was revealed. Conclusions. Correction of the scaphoid reduction in position of clenched fist may result from influence of radial extensors of the wrist (both short and long) as dynamic stabilizers of SL complex. This imagining is a completion of the radiological symptoms so far occurring in this SL instability. In case of acute, partial scapholunate ligament tear, reduction of scapholunate subluxation and its internal fixation with the lunate and capitate for a 6-week period may be an optional procedure

Źródło:

Polish Journal of Surgery; 2013, 85, 8; 452-459
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 20.

Tytuł:

The Woman as the “Other” in Yamina Bachir’s “Rachida” and Aziz Salmy “Amours Voileés”

Autorzy:

Bouchemal, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/2158874.pdf

Data publikacji:

2023-01-05

Wydawca:

Academicus. International Scientific Journal publishing house

Tematy:

Other
North African cinema
“Rachida”
“Amours Voileés”

Opis:

This article focuses on the representation of woman as the “Other” in Algerian and Moroccan Films. Such representations reveal how questions pertaining to the status of woman in a much patriarchal society became at the hub of cinematic forms of expression. Through their female protagonists, Yamina Bachir’s “Rachida” (2002) and Aziz Salmy “Amours Voileés” (2008) represent the traumatic experience of women with alienation and dependency, institutionalized violence and the “containment” of their sexuality. As counter-cinematic representations, these films try to depict the very sense of victimhood of the female protagonists as they defy accepted ideas and stereotypes about gender and offer a voice to the voiceless. To this point, the paper further focuses on how these women manage to transgress the threshold and offer a much newer interpretation of women and their role in society.

Źródło:

Academicus International Scientific Journal; 2023, 14, 27; 57-66
2079-3715
2309-1088

Pojawia się w:

Academicus International Scientific Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 21.

Tytuł:

Ensembles pluripolaires exceptionnels pour la croissance partielle des fonctions holomorphes

Autorzy:

Zeriahi, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/715170.pdf

Data publikacji:

1989

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Źródło:

Annales Polonici Mathematici; 1989-1990, 50, 1; 81-91
0066-2216

Pojawia się w:

Annales Polonici Mathematici

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 22.

Tytuł:

Measure valued solutions for systems governed by neutral differential equations on Banach spaces and their optimal control

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729292.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

neutral differential equations
Banach spaces
optimal control

Opis:

In this paper we consider the question of existence of measure valued solutions for neutral differential equations on Banach spaces when there is no mild solutions. We prove the existence of measure solutions and their regularity properties. We consider also control problems of such systems and prove existence of optimal feedback controls for some interesting a-typical control problems.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2013, 33, 1; 89-109
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 23.

Tytuł:

Optimal control of ∞-dimensional stochastic systems via generalized solutions of HJB equations

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729348.pdf

Data publikacji:

2001

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

optimal control
stochastic systems
infinite dimension
HJB equation
stationary feedback control

Opis:

In this paper, we consider optimal feedback control for stochastc infinite dimensional systems. We present some new results on the solution of associated HJB equations in infinite dimensional Hilbert spaces. In the process, we have also developed some new mathematical tools involving distributions on Hilbert spaces which may have many other interesting applications in other fields. We conclude with an application to optimal stationary feedback control.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2001, 21, 1; 97-126
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 24.

Tytuł:

Weak compactness in the space of operator valued measures $M_ba(Σ,(X,Y))$ and its applications

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729361.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

space of operator valued measures
weak compactness
semigroups of bounded linear operators
optimal structural control

Opis:

In this note we present necessary and sufficient conditions characterizing conditionally weakly compact sets in the space of (bounded linear) operator valued measures $M_{ba}(Σ,(X,Y))$. This generalizes a recent result of the author characterizing conditionally weakly compact subsets of the space of nuclear operator valued measures $M_{ba}(Σ,₁(X,Y))$. This result has interesting applications in optimization and control theory as illustrated by several examples.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2011, 31, 2; 231-247
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 25.

Tytuł:

Optimal control of systems determined by strongly nonlinear operator valued measures

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729396.pdf

Data publikacji:

2008

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

evolution equations
strongly nonlinear operator valued measures
existence of solutions
regularity properties
optimal control

Opis:

In this paper we consider a class of distributed parameter systems (partial differential equations) determined by strongly nonlinear operator valued measures in the setting of the Gelfand triple V ↪ H ↪ V* with continuous and dense embeddings where H is a separable Hilbert space and V is a reflexive Banach space with dual V*. The system is given by
dx + A(dt,x) = f(t,x)γ(dt) + B(t)u(dt), x(0) = ξ, t ∈ I ≡ [0,T]
where A is a strongly nonlinear operator valued measure mapping Σ × V to V* with Σ denoting the sigma algebra of subsets of the set I and f is a nonlinear operator mapping I × H to H, γ is a countably additive bounded positive measure and the control u is a suitable vector measure. We present existence, uniqueness and regularity properties of weak solutions and then prove the existence of optimal controls (vector valued measures) for a class of control problems.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2008, 28, 1; 165-189
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 26.

Tytuł:

Vector and operator valued measures as controls for infinite dimensional systems: optimal control

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729468.pdf

Data publikacji:

2008

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

evolution equations
Banach spaces
operator valued measures
strong operator topology
existence of solutions
optimal control

Opis:

In this paper we consider a general class of systems determined by operator valued measures which are assumed to be countably additive in the strong operator topology. This replaces our previous assumption of countable additivity in the uniform operator topology by the weaker assumption. Under the relaxed assumption plus an additional assumption requiring the existence of a dominating measure, we prove some results on existence of solutions and their regularity properties both for linear and semilinear systems. Also presented are results on continuous dependence of solutions on operator and vector valued measures, and other parameters determining the system which are then used to prove some results on control theory including existence and necessary conditions of optimality. Here the operator valued measures are treated as structural controls. The paper is concluded with some examples from classical and quantum mechanics and a remark on future direction.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2008, 28, 1; 95-131
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 27.

Tytuł:

Impulsive perturbation of C₀-semigroups and stochastic evolution inclusions

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729564.pdf

Data publikacji:

2002

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

impulsive perturbations
C₀-semigroups
stochastic systems
differential inclusions
vector measures
impulsive controls

Opis:

In this paper, we consider a class of infinite dimensional stochastic impulsive evolution inclusions. We prove existence of solutions and study properties of the solution set. It is also indicated how these results can be used in the study of control systems driven by vector measures.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2002, 22, 1; 125-149
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 28.

Tytuł:

Optimal control of general McKean-Vlasov stochastic evolution equations on Hilbert spaces and necessary conditions of optimality

Autorzy:

Ahmed, N.

Powiązania:

https://bibliotekanauki.pl/articles/729626.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

McKean-Vlasov stochastic differential equation
Hilbert spaces
relaxed controls
existence of optimal controls

Opis:

In this paper we consider controlled McKean-Vlasov stochastic evolution equations on Hilbert spaces. We prove existence and uniqueness of solutions and regularity properties thereof. We use relaxed controls, adapted to a current of sub-sigma algebras generated by observable processes, and taking values from a Polish space. We introduce an appropriate topology based on weak star convergence. We prove continuous dependence of solutions on controls with respect to appropriate topologies. Theses results are then used to prove existence of optimal controls for Bolza problems. Then we develop the necessary conditions of optimality based on semi-martingale representation theory on Hilbert spaces. Next we show that the adjoint processes arising from the necessary conditions optimality can be constructed from the solution of certain BSDE.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2015, 35, 2; 165-195
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 29.

Tytuł:

PEGYLATED GEMCITABINE AND METHOTREXATE: IN VITRO CYTOTOXICITY ANALYSIS AND IN VIVO DRUG RELEASE PROFILING TO ASSESS THEIR ENHANCED BLOOD CIRCULATION

Autorzy:

Ahmed, Mahmood

Powiązania:

https://bibliotekanauki.pl/articles/895274.pdf

Data publikacji:

2019-08-30

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

drug delivery
anti-proliferation
Pegylation
spheroids

Opis:

In the present study, four new pegylated drugs were synthesized to investigate the anticancer activity. All the compounds were characterized on the basis of FTIR and 1HNMR. The new compounds were evaluated against HCT116 cell line by CellTiter-Glo® 3D cell viability assay. The sustained release pattern of newly synthesized compounds were also evaluated, slow released lasts for 240 h which was confirmed by in vivo and in vitro drug release profile. The sustained and controlled release behavior of pegylated drugs over the extended period of time showed a linear profile and this release pattern was not limited to diffusion process instead supporting chemically controlled release pattern which was dependent only on how fast the compound hydrolyzed. The newly designed pegylated drugs showed almost same killing effect against the cancer cells as the free drugs. The compounds with lower cLogP value showed more antiproliferative (lower IC50) effect due their higher cell permeability.

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 4; 653-659
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 30.

Tytuł:

Préimages d’espaces héréditairement de Baire

Autorzy:

Bouziad, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/1205433.pdf

Data publikacji:

1997

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

Baire space
totally non-meagre space
Lasnev space
χ-scattered space
quasi-perfect map

Opis:

The main result is slightly more general than the following statement: Let f: X → Y be a quasi-perfect mapping, where X is a regular space and Y a Hausdorff totally non-meagre space; if X or Y is χ-scattered, or if Y is a Lasnev space, then X is totally non-meagre. In particular, the product of a compact space X and a Hausdorff regular totally non-meagre space Y which is χ-scattered or a Lasnev space, is totally non-meagre.

Źródło:

Fundamenta Mathematicae; 1997, 153, 2; 191-197
0016-2736

Pojawia się w:

Fundamenta Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 31.

Tytuł:

Achtung Zelig ! : deux monstres et un clown au carrefour de l’histoire et de la mémoire médiatique
Achtung Zelig!: Two Monsters and a Clown at the Crossroads of History and Media Memories

Autorzy:

Ahmed, Maaheen

Powiązania:

https://bibliotekanauki.pl/articles/1627975.pdf

Data publikacji:

2017-12-01

Wydawca:

Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego

Opis:

Unfolding during the Second World War Achtung Zelig! adopts a mode of narration that is both fantastic and absurd. The comic not only reflects the issues surrounding the representation of the unimaginable and real horrors of the Holocaust but it also exemplifies the presence and functioning of ‘media memories’ or memories of specific cultural productions as well as media and the performing arts (circus, theatre). This article examines the functioning, particularly the generation of connotations, of the key media memories of the carnivalesque, Art. Spiegelman's Maus, Horst Rosenthal's Mickey au camp de Gurs and Charlie Chaplin's The Great Dictator in Achtung Zelig!

Źródło:

Cahiers ERTA; 2017, 12; 29-48
2300-4681

Pojawia się w:

Cahiers ERTA

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 32.

Tytuł:

Minoration de la période du développement de √(a²n²+bn+c) en fraction continue

Autorzy:

Farhane, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/1391617.pdf

Data publikacji:

1994

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Źródło:

Acta Arithmetica; 1994, 67, 1; 63-67
0065-1036

Pojawia się w:

Acta Arithmetica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 33.

Tytuł:

Radiological Investigation of Relationship Between Lunate type and Ulnar Variance

Autorzy:

Elsaftawy, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/1396407.pdf

Data publikacji:

2013-10-01

Wydawca:

Index Copernicus International

Tematy:

ulnar variance
lunate types
Kienböck’s disease
avascular necrosis

Opis:

Some variances and anatomical proportions of the wrist may contribute to development of avascular necrosis of the lunate. Kienböck’s disease is more often encountered in young males, who suffer, among others, from type II of the lunate (with two joint surfaces for the capitate and hamate) and/or negative variance of ulna in relation to radius. The aim of the study was to investigate whether there exists interdependence between the simultaneous occurrence of individual types of the lunate with one of the variances of ulna in both genders. Material and methods. A retrospective analysis of 394 (n=394) radiological tests of the wrist in 174 (44%) women and 220 (56%) males aged 18-83 years (average age 39 years). From the entire pool, 265 X-rays were educed in 104 females and 161 males, and no fractures or wrist instability features were could be observed. The X-rays were obtained from computer lab and archive data base at St Hedwig Hospital in Trzebnica from the beginning of January 2011 to the end of December 2012. Results. 196 cases (74%) were found with type I of the lunate and 69 cases (26%) with type II. Ulnar variance amounted to from +4.7 mm to -4.2 mm (mean value +0.9 mm). Positive ulnar variance was stated in 44 patients (16.6%), negative in 63 (23.7%) and neutral accounted for the biggest group of other 158 (59.7%) patients. Conclusions. Neutral variance of ulna is the one that occurs most often in the Polish population. There is no correlation between gender and ulnar variance. There is also lack of direct connection between occurrence of individual lunate types and ulnar variance.

Źródło:

Polish Journal of Surgery; 2013, 85, 10; 576-580
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 34.

Tytuł:

Proposition of a new classification for scapholunate instability

Autorzy:

Elsaftawy, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/1396494.pdf

Data publikacji:

2013-11-01

Wydawca:

Index Copernicus International

Tematy:

scapholunate instability
scapholunate ligament tear
scapholunate dissociation
rotatory subluxationa of scaphoid
new classification

Opis:

Scapholunate (SL) instability is the most common pattern of instabilities in the wrist. If untreated or undiagnosed, it may lead to degenerative changes with SLAC (scapholunate advanced collapse) wrist. There are a few of of well-known SL instability classifications. The one that takes into account a dynamic or static nature of SL instability is the most accepted and used. The arthroscopic classifications are also becoming more and more popular. The aim of the study was the critical review of most popular classifications of SL instability, yet at the same time we proposed a new SL instability classification. Results. The new classification was found to be very useful in the process of diagnosis and decision making concerning further treatment of patients with SL instability in our department. Conclusions. The proposed new classification combines the opportunity of evaluating the scapholunate interosseus ligament (SLIL) tear and lesions of the secondary static stabilizers of SL ligament complex that can coexist with or without DISI deformity (Dorsal Intercalated Segmental Instability).

Źródło:

Polish Journal of Surgery; 2013, 85, 11; 676-680
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 35.

Tytuł:

The Beta Pareto Distribution

Autorzy:

Hurairah, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/465778.pdf

Data publikacji:

2011

Wydawca:

Główny Urząd Statystyczny

Tematy:

Beta Pareto distribution
Kurtosis
Rényi entropy

Opis:

In this paper, we introduce a generalization—referred to as the beta Pareto distribution, generated from the logit of a beta random variable. We provide a comprehensive treatment of the mathematical properties of the beta Pareto distribution. We derive expressions for the kth moments of the distribution, variance, skewness, kurtosis, mean deviation about the mean, mean deviation about the median, Rényi entropy, Shannon entropy. We also discuss simulation issues, estimation of parameters by the methods of moments and maximum likelihood.

Źródło:

Statistics in Transition new series; 2011, 12, 1; 97-114
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 36.

Tytuł:

Extension of several sufficient conditions for Hamiltonian graphs

Autorzy:

Ainouche, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/744192.pdf

Data publikacji:

2006

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

hamiltonian graph
dual closure
neighborhood closure

Opis:

Let G be a 2-connected graph of order n. Suppose that for all 3-independent sets X in G, there exists a vertex u in X such that |N(X∖{u})|+d(u) ≥ n-1. Using the concept of dual closure, we prove that
1. G is hamiltonian if and only if its 0-dual closure is either complete or the cycle C₇
2. G is nonhamiltonian if and only if its 0-dual closure is either the graph $(K_r ∪ Kₛ ∪ Kₜ) ∨ K₂$, 1 ≤ r ≤ s ≤ t or the graph $((n+1)/2)K₁ ∨ K_{(n-1)/2}$.
It follows that it takes a polynomial time to check the hamiltonicity or the nonhamiltonicity of a graph satisfying the above condition. From this main result we derive a large number of extensions of previous sufficient conditions for hamiltonian graphs. All these results are sharp.

Źródło:

Discussiones Mathematicae Graph Theory; 2006, 26, 1; 23-39
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Towarzysz Mauser : od początku mauser był reklamowany jako "cudowny pistolet--karabin". Szybko stał się popularny wśród wojskowych różnych armii, chociaż w żadnym kraju nie został oficjalnie wprowadzony do uzbrojenia

Autorzy:

Borz, Ahmed.

Powiązania:

Komandos 1999, nr 10. Dod. "Broń & amunicja", s. 12

Data publikacji:

1999

Tematy:

"Mauser" (pistolet) zastosowanie Czeczenia (Rosja) pamiętniki
Pistolety maszynowe zastosowanie Czeczenia (Rosja) pamiętniki
Wojna 1994-1996 r.w Czeczenii pamiętniki
Literatura polska
Pamiętniki i wspomnienia

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 38.

Tytuł:

Spatio-temporal structure of natural and anthropogenic land use in a semi-arid watershed: Northwest Algeria

Autorzy:

Melalih, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/27312637.pdf

Data publikacji:

2023

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

Algeria
GIS
land use
natural formation
anthropogenic formation
remote sensing
semi-arid watershed
Wadi Sarno

Opis:

The objective of this study is to map through multisource data, the change in land use structure and quantify its evolution around the semi-arid watershed of Wadi Sarno of Sidi Bel Abbès between 2000 and 2021. To this end, satellite images of 2000 and 2021 have been exploited by remote sensing and GIS, as well as field surveys for verification and validation of the results obtained. The methodology is based on supervised classification by maximum likelihood from the processing of satellite images. The analysis of the dynamics of land use shows that the areas of natural formations (dense forest and bare land) have decreased from 17,560 ha to 15,516 ha, that is to say, a regression of 8.04%, while the anthropised formations (Agriculture, open forest and rangeland, built-up areas, water bodies) have experienced an increase in their surface area, they have gone from 7901 ha to 9945 ha, that is to say, 10.4% of the total surface area of the basin. In the light of these results, it is possible to define priority areas for restoring degraded zones and enhancing natural formations. by giving priority to perennial crops to fix the soil in place and benefit from additional income for the region's farmers. By planting hardy species such as olives, figs, almonds, carob trees and so on. These species have proven their effectiveness and adaptation to local soil and climate conditions.

Źródło:

Journal of Water and Land Development; 2023, 58; 110--119
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Physical activity in type 2 diabetes mellitus: a review

Autorzy:

Burooj, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/33777868.pdf

Data publikacji:

2024-04-10

Wydawca:

Gdański Uniwersytet Medyczny

Tematy:

T2DM
Exercise
Diabetes
Diabetes Mellitus
Physical Activity

Opis:

Introduction This literature review explores the role of physical activity (PA) in managing and preventing type 2 diabetes mellitus (T2DM), synthesizing the latest guidelines for all T2DM patients. Following PRISMA guidelines, it identifies specific areas for further research. Material and Methods Indexing services (PubMed and Scopus) were used to identify relevant studies, emphasizing original research, review articles, and updated institutional guidelines spanning 2017-2023. The following keywords were used: diabetes, physical activity, type 2 diabetes mellitus, PA, and exercise. Proposal and opinion articles, non-English papers (or those lacking full-text translation), studies involving non-human subjects, pediatric populations or with skewed gender distribution were excluded. Results PA improves quality of life, BMI, glycemic control and well-being. Effects vary by activity domain, such as work or leisure time. Recommendations suggest 60 daily minutes of exercise for children, 150 weekly minutes of moderate intensity exercise for adults, and screening for adverse events. A “sit-less” approach is proposed for those unable to maintain regular activity, with glycemic monitoring for those with variability. Conclusions PA is crucial in T2DM management. Conflicting findings regarding glycemic control warrant further investigation to ascertain causes, whether related to bias or other factors.

Źródło:

European Journal of Translational and Clinical Medicine; 2024, 7, 1; 97-105
2657-3148
2657-3156

Pojawia się w:

European Journal of Translational and Clinical Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Autonomy of urban light rail transport systems and its influence on users, expenditures, and operational costs

Autorzy:

Kostrzewski, Mariusz
Eliwa, Ahmed
Dawood, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/2203863.pdf

Data publikacji:

2022

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

light rail
transport system
autonomy
automation
expenditures
operational cost
lekka kolej miejska
system transportu
autonomia
automatyzacja
wydatki
koszty operacyjne

Opis:

The aim of this paper is to study and highlight various effects of automizing urban light rail transport systems by examining the impact of such structures on common users, as well as the expenditures and operational costs involved. By providing an overview of different transportation networks through the three categories of expenditure— transportation, maintenance, and administration—an idea of the general operational cost can be established. Additionally, by indicating the aforementioned cost, the effect of the grade of automation on costs can be determined and explained. However, this paper does not include an attempt to estimate these costs; it only states what may affect such costs. Furthermore, the factor of safety is considered by underlining the changes expected to occur with the implementation of such networks. The implementation of autonomous rail systems would result in lower operational costs, which is discussed in this paper based on another study. At the same time, the factor of safety was also observed as simultaneously increasing, as were the overall experiences of users, both in terms of aesthetics and function. The only setback found by the research is that some users would be reluctant to use a network without an operator.

Źródło:

Transport Problems; 2022, 17, 4; 165--175
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Performance Enhancement of Cooperative MIMO-NOMA Systems Over Sub-6 GHz and mmWave Bands

Autorzy:

Saleh, Ahmed A.
Ahmed, Mohamad A.

Powiązania:

https://bibliotekanauki.pl/articles/24200732.pdf

Data publikacji:

2023

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

error probability
MIMO
mmWave
NOMA
out-age probability
power allocation factor
successive-interference cancellation (SIC

Opis:

In this paper, two radio links with different frequency bands are considered for base stations (BS) serving users via decode-and-forward (DF) cooperative relays. Backhaul and access links are proposed with sub-6 GHz and millimeter wave (mmWave) bands, respectively. Non-orthogonal multiple access (NOMA) is employed in the backhaul link to simultaneously transmit a superposed signal in the power domain, using the same band. The superposed signals, containing two signals that differ in terms of power allocation factors (PAFs), are designed for two selected DF relays in the BS. The two relays are chosen from several relays to be serviced by the BS based on a pairing algorithm that depends on different users’ circumstances. The furthest DF relay detects the incoming NOMA signal directly, while the nearest one applies successive interference cancellation (SIC) before extracting its signal. Each DF relay forwards the detected signals toward their intended users over mmWave channels. Three performance metrics are utilized to evaluate the system’s performance: outage probability, achievable throughput, and bit error rate. Comparisons between two mmWave bands in the access link (28 and 73 GHz) are made to demonstrate the superiority of the 28 GHz band in terms of the three performance-related metrics.

Źródło:

Journal of Telecommunications and Information Technology; 2023, 2; 70--77
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

The first eigencurve for a Neumann boundary problem involving p-Laplacian with essentially bounded weights

Autorzy:

Sanhaji, Ahmed
Dakkak, Ahmed
Moussaoui, Mimoun

Powiązania:

https://bibliotekanauki.pl/articles/29519370.pdf

Data publikacji:

2023

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

p-Laplacian
first eigencurve
singular weights
Neumann boundary conditions

Opis:

This article is intended to prove the existence and uniqueness of the first eigencurve, for a homogeneous Neumann problem with singular weights associated with the equation $ −\Delta_p u = \alpha m_1 |u|^{p−2} u + \beta m_2 |u|^{p−2} u $ in a bounded domain $ \Omega \subset \mathbb{R}^N $. We then establish many properties of this eigencurve, particularly the continuity, variational characterization, asymptotic behavior, concavity and the differentiability.

Źródło:

Opuscula Mathematica; 2023, 43, 4; 559-574
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Optimal placement and sizing of FACTS devices based on Autonomous Groups Particle Swarm Optimization technique

Autorzy:

Shehata, Ahmed A.
Refaat, Ahmed
Ahmed, Mamdouh K.
Korovkin, Nikolay V.

Powiązania:

https://bibliotekanauki.pl/articles/1841330.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

active power losses minimization
AGPSO
FACTS
MFO
PSO
SVC
minimalizacja strat mocy czynnej

Opis:

This paper presents the application of Flexible Alternating Current Transmission System (FACTS) devices based on heuristic algorithms in power systems. The work proposes the Autonomous Groups Particle Swarm Optimization (AGPSO) approach fort he optimal placement and sizing of the Static Var Compensator (SVC) to minimize thetotal active power losses in transmission lines. A comparative study is conducted with other heuristic optimization algorithms such as Particle Swarm Optimization (PSO), Time-varying Acceleration Coefficients PSO (TACPSO), Improved PSO (IPSO), Modified PSO(MPSO), and Moth-Flam Optimization (MFO) algorithms to confirm the efficacy of the proposed algorithm. Computer simulations have been carried out on MATLAB with the MATPOWER additional package to evaluate the performance of the AGPSO algorithm on the IEEE 14 and 30 bus systems. The simulation results show that the proposed algorith moffers the best performance among all algorithms with the lowest active power losses and the highest convergence rate.

Źródło:

Archives of Electrical Engineering; 2021, 70, 1; 161-172
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Evaluation of natural radioactivity in Selected Soil Samples from the Archaeological of Ur City by using HPGe detector

Autorzy:

Ahmed Najam, Laith Ahmed
Ebrahiem, Sameera Ahmed
Akram Abbas, Shaemaa Akram

Powiązania:

https://bibliotekanauki.pl/articles/1182838.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Natural radioactivity; Radiation hazard indices; HPGe detector; Ur city

Opis:

In this paper, the determination of specific activity concentrations in ten soil samples collected from the antiquity's area of the archaeological of Ur city, were carried out using HPGe scintillation detector. The results of measurements have shown that the specific activity, for 238U varied from (16.520 Bq/kg) to (30.620 Bq/kg), with average value (24.730 ±4.05 Bq/kg), the specific activity of Th-232 was varied from (18.730 Bq/kg) to (31.670 Bq/kg), with average value of (25.098 ±3.41 Bq/kg), while the specific activity of K-40 was varied from (123.340 Bq/kg) to (261.480 Bq/kg), with average value of (189.767 ±39.47 Bq/kg). All soil samples of the archaeology of Ur city were found to be lower than the recommended values given by (UNSCEAR, 2000). In order to asses the radiological hazards of the radioactivity in soil samples of the archaeological of Babylon city, (Raeq, DƔ, AEDin, AEDout, EAD, Iɣ,Iα, Hin and Hex) have been calculated, and all the obtained results were found lower than the allowed limits given by (UNSCEAR, 2000).

Źródło:

World Scientific News; 2017, 62; 79-92
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Effect of Seeding Rate and the Spraying with Licorice Extract in Oil Percentage and Active Ingredients of Caraway (Carum Carvi L.)

Autorzy:

Hassan, Ahmed Yassin

Powiązania:

https://bibliotekanauki.pl/articles/24201720.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

caraway
carvone
limonene
humic acid
seeding rate

Opis:

A field experiment was conducted to study the effect of three levels of seeding rate (4.7 and 10 kg•h-1) and three concentrations of licorice extract (0.3 and 6 g•L-1) the data were analyzed statistically by using a factorial experiment according to the randomized complete block design (RCBD) with three replicates. The results showed that the seeding rate 7 kg•h-1 gave a significant increase in seeds yield, volatile oil yield, and limonene ratio, which were 1162.6 kg•h-1, 25.6 kg•h-1, and 30.41%, respectively. In turn, seeding rate 4 kg•h-1 gave a higher average of the volatile oil percent and carvone percent, which were 2.3 % and 67.27%, respectively. The results also revealed that spraying of licorice extract with 3 g•L-1 gave significantly influenced in seeds yield and volatile oil yield which were (1016.6 and 23.3 kg•h-1) respectively, whereas the spraying of licorice extract with 6 g•L-1 gave the highest ratio of carvone and limonene which were 29.71% and 67.54% respectively. The interaction between the seeding rate of 7 kg•h-1 and licorice extract with 3 g•L-1 had a significant effect on seeds yield and volatile oil yield, which amounted to (1234.2 and 28.4 kg•h-1), respectively.

Źródło:

Journal of Ecological Engineering; 2023, 24, 4; 140--150
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

The Inverse Reaction Cross Sections for Some Charged Particles Using the Optical Model Parameters

Autorzy:

Ahmed, Rasha S.

Powiązania:

https://bibliotekanauki.pl/articles/1193016.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Optical reaction cross-sections
charged particles
neutrons
pre-equilibrium models

Opis:

p-nucleus, (_1^2)H-nucleus, (_1^3)H-nucleus, and (_2^4)He-nucleus inverse reaction cross sections have been determined using the optical model potentials in a wide range of target nuclei started from A=1 to A=232 using several incident particle energies ( E = 2, 8, 10, 20, and 40 MeV). In this work, a large number of optical model available parameters were used to calculate the inverse reaction cross section and compared to investigate the effect of the mass number and incident particle energy on the inverse reaction cross section. All the calculations were performed using MATHLAB programming language.

Źródło:

World Scientific News; 2016, 28; 72-83
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Enhancing IoT Performance via Using Mobility Aware for Dynamic RPL Routing Protocol Technique (MA-RPL)

Autorzy:

Zarzoor, Ahmed R.

Powiązania:

https://bibliotekanauki.pl/articles/2055261.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

internet of things
IoTs
routing protocol for low power and lossy networks
RPL
mobility aware
MA-RPL
time difference of arrival
TDoA

Opis:

Nodes' aware-mobility in the Internet of Things (IoTs) stills open defy for researchers, due to the dynamic changing of routing path and networks’ resource limitations. Therefore, in this study a new method is proposed called Mobility Aware - “Routing Protocol for Low power and Lossy Networks” (MARPL), that consists of two phases: in the first phase splitting the entire network into sub areas based on reference nodes with “Time Difference of Arrival” (TDoA) technique. While, the second phase, is about managing mobile nodes (MNs) in RPL according to the sub areas' ID. The Cooja simulator software has been used to implement and assess MA-RPL method performance, according to the data packet metrics (lost packet, packet delivery ratio PDR), latency and nodes' power usage in comparison with two methods: Corona (Co-RPL) and Mobility Enhanced (ME-RPL). The simulation results have been shown that the MA-RPL method consumes less nodes' energy usage, gives less latency with minimum data packet loss in comparison with Co-RPL and MERPL.

Źródło:

International Journal of Electronics and Telecommunications; 2022, 68, 2; 187--191
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Experimental investigation on performance of a spark ignition engine runs with alcoholic blend-gasoline

Autorzy:

Ahmed, H. A.

Powiązania:

https://bibliotekanauki.pl/articles/243048.pdf

Data publikacji:

2015

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

methanol
ethanol
butanol
compression ratio
specific fuel consumption
exhaust gas temperature
performance

Opis:

In this paper performance resulted from a single cylinder spark-ignition engine fuelled with 20% by volume of methanol, ethanol, and butanol was studied and compared to gasoline. The experiments were conducted at variable speed and maximum torques. The conditions of stoichiometric air–fuel ratio at wide-open throttle were used. The tests were perfumed at higher useful compression ratio of the used Iraqi gasoline. The test results show that the higher compression ratio for the tested gasoline was 7.5:1. So an Iraqi conventional gasoline has engine HUCR=7.5:1 and its OST= 19 ºBTDC, this compression ratio can be considered low. Adding 20% of alcoholic blends by volume to gasoline improved the engine performance. Within the tested speed range, alcoholic blends produced higher brake powers, volumetric efficiency and thermal efficiency. In addition, it resulted in lower exhaust gases temperatures. The brake specific fuel consumption of the tested alcoholic blend was higher than that for gasoline.

Źródło:

Journal of KONES; 2015, 22, 3; 249-256
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Stochastic diffrential equations on Banach spaces and their optimal feedback control

Autorzy:

Ahmed, N.U.

Powiązania:

https://bibliotekanauki.pl/articles/952179.pdf

Data publikacji:

2012

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

stochastic differential equations
Banach spaces
optimal feedback control
objective functionals
Lévy-Prohorov metric
Hausdorff dimension
time-optimal problems

Opis:

In this paper we consider stochastic differential equations on Banach spaces (not Hilbert). The system is semilinear and the principal operator generating a C₀-semigroup is perturbed by a class of bounded linear operators considered as feedback operators from an admissible set. We consider the corresponding family of measure valued functions and present sufficient conditions for weak compactness. Then we consider applications of this result to several interesting optimal feedback control problems. We present results on existence of optimal feedback operators.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2012, 32, 1; 87-109
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

The Causes of Re-exam and Its Role of in Improving Academic Achievement of Low Scoring Students in Haramaya University

Autorzy:

Hussen, Anwar Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/454182.pdf

Data publikacji:

2018

Wydawca:

Akademia Ignatianum w Krakowie

Tematy:

Academic achievement
FX grade
Re-exam

Opis:

Re-exam is a form of supplementary assessment designed to provide second opportunity for students who scored final course marks between [30 and 40). This study employed survey design that involves both quantitative and qualitative approaches. Questionnaire, interview and document analysis for collecting data from both primary and secondary sources were designed and executed. 315 students and 15 instructors were incorporated as a sample using stratified random and purposive sampling techniques respectively. Available sampling technique was utilized to add 10 cluster registrar heads and 18 registrar data managers as a sample. The finding of the study showed that: poor academic background of the students, health problem at the time of exam and deliberately scoring FX grade were the main causes that expose students to score FX grade. Additionally, it was found out that, majority of students scored FX grade in across departmental courses than home base courses. The finding further indicated that, re-exam is playing great role in helping low achieving students to improve their academic achievement as 43% of the students who scored FX grade in their first assessment have scored C and above marks after re-exam. The relationship between study year level and the number of students who scored FX grade (r = -0.92, p < 0.05) is negative and significant. The computed t-test result t(971) = 1.0, p> 0.05 indicated that males and females are not differed significantly on their achievement of re-exam

Źródło:

Multidisciplinary Journal of School Education; 2018, 13; 189-211
2543-7585

Pojawia się w:

Multidisciplinary Journal of School Education

Dostawca treści:

Biblioteka Nauki

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