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

/5

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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

/5

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Skocz do pozycji: 51.

Tytuł:

Ocalało tylko dwóch świadków : Amerykanie zostali "stratowani, zatłuczeni i zagryzieni na śmierć" po tym, gdy wzniecili bunt więźniów

Autorzy:

Ahmed, Rashmee Z.

Powiązania:

Forum 2001, nr 51, s. 18-19

Data publikacji:

2001

Tematy:

Operacja antyterrorystyczna 2001- w Afganistanie przestępstwo wojenne
Prawo wojenne

Opis:

Fot.; Tł. art. zamieszcz. w "The Times of India". --- 2001, 30 XI.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 52.

Tytuł:

In Najaf

Autorzy:

Abdel-Sahib, Ahmed.

Powiązania:

The Washington Post 2003, 28 lipiec

Data publikacji:

2003

Opis:

Wypowiedź na temat radości z obalenia reżimu Saddama Husajna.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 53.

Tytuł:

Lifting Results for Finite Dimensions to the Transfinite in Systems of Varieties Using Ultraproducts

Autorzy:

Sayed Ahmed, Tarek

Powiązania:

https://bibliotekanauki.pl/articles/43189294.pdf

Data publikacji:

2024

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

algebraic logic
systems of varieties
ultraproducts
non-finite axiomaitizability

Opis:

We redefine a system of varieties definable by a schema of equations to include finite dimensions. Then we present a technique using ultraproducts enabling one to lift results proved for every finite dimension to the transfinite. Let \(\bf Ord\) denote the class of all ordinals. Let \(\langle \mathbf{K}_{\alpha}: \alpha\in \bf Ord\rangle\) be a system of varieties definable by a schema. Given any ordinal \(\alpha\), we define an operator \(\mathsf{Nr}_{\alpha}\) that acts on \(\mathbf{K}_{\beta}\) for any \(\beta>\alpha\) giving an algebra in \(\mathbf{K}_{\alpha}\), as an abstraction of taking \(\alpha\)-neat reducts for cylindric algebras. We show that for any positive \(k\), and any infinite ordinal \(\alpha\) that \(\mathbf{S}\mathsf{Nr}_{\alpha}\mathbf{K}_{\alpha+k+1}\) cannot be axiomatized by a finite schema over \(\mathbf{S}\mathsf{Nr}_{\alpha}\mathbf{K}_{\alpha+k}\) given that the result is valid for all finite dimensions greater than some fixed finite ordinal. We apply our results to cylindric algebras and Halmos quasipolyadic algebras with equality. As an application to our algebraic result we obtain a strong incompleteness theorem (in the sense that validitities are not captured by finitary Hilbert style axiomatizations) for an algebraizable extension of \(L_{\omega,\omega}\).

Źródło:

Bulletin of the Section of Logic; 2024, 53, 2; 145-154
0138-0680
2449-836X

Pojawia się w:

Bulletin of the Section of Logic

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

UŻYTKOWANIE BUDYNKU A OBOWIĄZEK PODATKOWY W PODATKU OD NIERUCHOMOŚCI

Autorzy:

Sylwia, Skrzypek - Ahmed,

Powiązania:

https://bibliotekanauki.pl/articles/567726.pdf

Data publikacji:

2019-09-04

Wydawca:

Międzynarodowy Instytut Innowacji Nauka – Edukacja – Rozwój w Warszawie

Tematy:

podatek od nieruchomości
budynek
budowla
opodatkowanie

Opis:

W praktyce wątpliwości budzi zarówno kwestia powstania obowiązku podatkowego w podatku od nieruchomości, jak i jego wygaśnięcia, szczególnie w sytuacji rozbiórki budynków (jak i sprzedaży nieruchomości po wybudowaniu). Podatnicy zwracają uwagę, że obiekt pozbawiony jednego z konstytutywnych dla budynku elementów, jak posiadanie ścian czy dachu nie jest budynkiem i nie powinien podlegać opodatkowaniu bez względu na czas trwania jego rozbiórki. Sądy administracyjne w większości zajmują korzystne dla podatników stanowisko, stwierdzając m.in., iż prace rozbiórkowe budynku najczęściej są rozciągnięte w czasie, zatem jeszcze przed zakończeniem rozbiórki może dojść do wyga-śnięcia obowiązku podatkowego na skutek utraty przez obiekt podlegający rozbiórce cech konstytutywnych budynku w rozumieniu ustawy. Zatem wygaśnięcie obowiązku podatkowego może być związane z pozbawieniem budynku jednej z zewnętrznych przegród budowlanych (np. ściany nośnej) lub dachu. Ważne jest zatem, aby podatnicy przeprowadzający rozbiórkę potrafili (w przypadku sporu z organami podatkowymi) udokumentować fakt rozbiórki np. dachu czy ściany budynku, poprzez wpisy w dzienniku budowy, jak i dowody w postaci np. dokumentacji fotograficznej. podatek od nieruchomości, budynek, budowla, opodatkowanie

Źródło:

International Journal of Legal Studies (IJOLS); 2019, 5(1); 407-419
2543-7097
2544-9478

Pojawia się w:

International Journal of Legal Studies (IJOLS)

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Controllability of evolution equations and inclusions driven by vector measures

Autorzy:

Ahmed, N.U.

Powiązania:

https://bibliotekanauki.pl/articles/729615.pdf

Data publikacji:

2004

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

controlability
impulsive systems
differential inclusions
Hilbert spaces
vector valued measures
C₀ semigroups

Opis:

In this paper, we consider the question of controllability of a class of linear and semilinear evolution equations on Hilbert space with measures as controls. We present necessary and sufficient conditions for weak and exact (strong) controllability of a linear system. Using this result we prove that exact controllability of the linear system implies exact controllability of a perturbed semilinear system. Controllability problem for the semilinear system is formulated as a fixed point problem on the space of vector measures and is concluded controllability from the existence of a fixed point. Our results cover impulsive controls as well as regular controls.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2004, 24, 1; 49-72
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

KULTURSTANDARDS FÜR DIE INTERKULTURELLE KOMPETENZ
Cultural Standards for Intercultural Competences

Autorzy:

Trad, Ahmed Rafik

Powiązania:

https://bibliotekanauki.pl/articles/444150.pdf

Data publikacji:

2003-12-01

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Źródło:

Acta Neophilologica; 2003, V; 195-202
1509-1619

Pojawia się w:

Acta Neophilologica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Interkultrelles Lernen mit der Projektm ethode

Autorzy:

Trad, Ahmed Rafik

Powiązania:

https://bibliotekanauki.pl/articles/444188.pdf

Data publikacji:

2001

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Źródło:

Acta Neophilologica; 2001, III; 65-83
1509-1619

Pojawia się w:

Acta Neophilologica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

The Impact of Working in a School Project on Students’ Behavior and Self-Perception
Wpływ pracy w szkolnym projekcie na zachowanie studentów

Autorzy:

Abu-Ahmed, Laila

Powiązania:

https://bibliotekanauki.pl/articles/923289.pdf

Data publikacji:

2020-12-26

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

dropping out
academic persistence
self-efficacy
hope for the future
sense of control

Opis:

This article describes a school intervention program that was initiated and developed by a small team in one of the schools in the city of Nazareth, Israel. The proposed program is intended to promote academic perseverance and thereby reduce dropout rates, providing youth at risk with a variety of personal and interpersonal skills that are important both for studies and for labor world. The findings showed that combining learning with work in the candle factory promoted attendance and reduced violent behavior in school.

Źródło:

Studia Edukacyjne; 2018, 50; 463-486
1233-6688

Pojawia się w:

Studia Edukacyjne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Improved photoresponse of porous silicon photodetectors by embedding CdS nanoparticles

Autorzy:

Abd, Ahmed N.

Powiązania:

https://bibliotekanauki.pl/articles/1193949.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

CdS
Nanoparticles
PSi
Photodetector
SEM
XRD

Opis:

In this research, the nanocrystalline porous silicon (PSi) films are prepared by electrochemical etching of p types silicon wafers with 15 mA/cm2 etching current densities and 15 min etching time on the formation nanosized pore array. PSi was characterized by the measurement of XRD, FTIR spectroscopy and atomic force microscopy properties (AFM). We have estimated crystallites size from X-Ray diffraction about nanoscale for PSi and Atomic Force microscopy confirms the nanometric size Chemical fictionalization during the electrochemical etching show on the surface chemical composition of PSi. The atomic force microscopy investigation shows the rough silicon surface. Also, it is reported the preparation of colloidal CdS nanoparticles NPs prepared by laser ablation in liquid (LAL) technique by irradiating with a Nd:YAG laser pulses CdS target immersed in methanol and varying the laser fluence 1.32 J/cm2. The structural, morphological and optical of CdS NPs has been studied. XRD measurement disclosed that the CdS NPs were of wurtzite hexagonal crystal structure. Transmission electron microscopy (TEM) investigation revealed that the synthesized CdS particles are spherical and have an average particle size in the range of (25 nm). AFM investigations showed that the produced CdS particles have ball-shape with good disposability. The energy band gap of CdS NPs prepared with 1.32 J/cm2 laser fluence has been determined from optical properties and found to be in the range (2.9 eV). Optical constants of CdS NPs were determined from transmittance and reflectance spectra.The effect of CdS NPs diffusion on properties of PSi Photodetector have reported which reveals that improving in (Al/PSi/Si/Al). The results show that a linear relationship between 1/C2 and reverse bias voltage was obtained. The built-in potential have values depending on the etching time current density and laser flunce. Al/CdSe/PSi/Si/Al photodetector hetrojunction have two peaks of response located at 415 nm and (700 -800nm) with max sensitivity 0.6 A/W. The maximum specific detectivity is 6.8×〖10〗^12 cm•〖Hz〗^(1/2) 〖•W〗^(-1) at 770 nm wavelength.

Źródło:

World Scientific News; 2015, 19; 32-49
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Urbach energy and dispersion parameters of CdS chemically deposited thin films on the effect of thickness

Autorzy:

Hadi, Ahmed Hussin

Powiązania:

https://bibliotekanauki.pl/articles/1177946.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

CdS thin film
Dispersion parameters
Urbach energy
chemical spray pyrolysis

Opis:

Optical transmittance spectra of CdS thin films were recorded from UV-Visible spectrophotometer in the range 380-900 nm. The films were prepared by chemical spray pyrolysis by spraying an aqueous solution of cadmium chloride (CdCl2) and thiourea [(NH2)2CS] with de-ionized water. UV-Visible spectrophotometer used to recording the transmittance spectra in the range of 380-900 nm. The transmittance decreased with the increasing of CdS film thickness, while the reflectance increases. The energy gap decreased with the increasing of film thickness, while Urbach energy increased. Dispersion parameters such as; Ed, Eo, ε∞, n(0), So, λo, M-1, and M-3 are studied.

Źródło:

World Scientific News; 2018, 97; 241-249
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

On Complete Representations and Minimal Completions in Algebraic Logic, Both Positive and Negative Results

Autorzy:

Sayed Ahmed, Tarek

Powiązania:

https://bibliotekanauki.pl/articles/2033851.pdf

Data publikacji:

2021-07-21

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

Algebraic logic
relation algebras
cylindric algebras
polyadic algebras
complete representations

Opis:

Fix a finite ordinal \(n\geq 3\) and let \(\alpha\) be an arbitrary ordinal. Let \(\mathsf{CA}_n\) denote the class of cylindric algebras of dimension \(n\) and \(\sf RA\) denote the class of relation algebras. Let \(\mathbf{PA}_{\alpha}(\mathsf{PEA}_{\alpha})\) stand for the class of polyadic (equality) algebras of dimension \(\alpha\). We reprove that the class \(\mathsf{CRCA}_n\) of completely representable \(\mathsf{CA}_n\)s, and the class \(\sf CRRA\) of completely representable \(\mathsf{RA}\)s are not elementary, a result of Hirsch and Hodkinson. We extend this result to any variety \(\sf V\) between polyadic algebras of dimension \(n\) and diagonal free \(\mathsf{CA}_n\)s. We show that that the class of completely and strongly representable algebras in \(\sf V\) is not elementary either, reproving a result of Bulian and Hodkinson. For relation algebras, we can and will, go further. We show the class \(\sf CRRA\) is not closed under \(\equiv_{\infty,\omega}\). In contrast, we show that given \(\alpha\geq \omega\), and an atomic \(\mathfrak{A}\in \mathsf{PEA}_{\alpha}\), then for any \(n<\omega\), \(\mathfrak{Nr}_n\mathfrak{A}\) is a completely representable \(\mathsf{PEA}_n\). We show that for any \(\alpha\geq \omega\), the class of completely representable algebras in certain reducts of \(\mathsf{PA}_{\alpha}\)s, that happen to be varieties, is elementary. We show that for \(\alpha\geq \omega\), the the class of polyadic-cylindric algebras dimension \(\alpha\), introduced by Ferenczi, the completely representable algebras (slightly altering representing algebras) coincide with the atomic ones. In the last algebras cylindrifications commute only one way, in a sense weaker than full fledged commutativity of cylindrifications enjoyed by classical cylindric and polyadic algebras. Finally, we address closure under Dedekind-MacNeille completions for cylindric-like algebras of dimension \(n\) and \(\mathsf{PA}_{\alpha}\)s for \(\alpha\) an infinite ordinal, proving negative results for the first and positive ones for the second.

Źródło:

Bulletin of the Section of Logic; 2021, 50, 4; 465-511
0138-0680
2449-836X

Pojawia się w:

Bulletin of the Section of Logic

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 62.

Tytuł:

Investigations of Couette flow unsteady radiative convective heat transfer in a vertical channel using the generalized method of lines (MOL)

Autorzy:

Sowayan, Ahmed S.

Powiązania:

https://bibliotekanauki.pl/articles/2174210.pdf

Data publikacji:

2022

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

promieniowanie
konwekcja naturalna
metoda Runge-Kutty
vertical channel
radiation
natural convection
method of lines (MOL)
Runge-Kutta method

Opis:

This study describes a very efficient and fast numerical solution method for the non-steady free convection flow with radiation of a viscous fluid between two infinite vertical parallel walls. The method of lines (MOL) is used together with the Runge-Kutta ODE Matlab solver to investigate this problem numerically. The presence of radiation adds more stiffness and numerical complexity to the problem. A complete derivation in dimensionless form of the governing equations for momentum and energy is also included. A constant heat flux condition is applied at the left wall and a transient numerical solution is obtained for different values of the radiation parameter (R). The results are presented for dimensionless velocity, dimensionless temperature and Nusselt number for different values of the Prandtl number (Pr), Grashof number (Gr), and the radiation parameter (R). As expected, the results show that the convection heat transfer is high when the Nusselt number is high and the radiation parameter is low. It is also shown that the solution method used is simple and efficient and could be easily adopted to solve more complex problems.

Źródło:

International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 199--211
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

The performance assessment of reverse osmosis stations at Al-Mahalabea area

Autorzy:

Ahmed, Mohammed F.

Powiązania:

https://bibliotekanauki.pl/articles/118750.pdf

Data publikacji:

2020

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

brackish water
desalination
membrane technology
reverse osmosis
SAW
TOPSIS

Opis:

The present study assesses RO stations at four sites in Al-Mahalabea area – Nineveh governorate, Iraq during the summer of 2013. The performance of RO stations are ranked by two methods: the Simple Additive Weight (SAW) and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). Two groups of samples were collected from feed and permeate water for two periods (at zero time of operation and after ten weeks of operation) with eleven parameters for each sample were analysed. The highest overall rejection R efficiency appeared with the first set of parameters more than 90% (SO4, TDS, NO3, TH, and turbidity), while the second set was the least (Cl, Na, and total alkalinity – TA) ranged between 65 and 85%. It is observed that both the SAW and the TOPSIS methods are accurate to predict the performance efficiency.

Źródło:

Scientific Review Engineering and Environmental Sciences; 2020, 29, 3; 332-342
1732-9353

Pojawia się w:

Scientific Review Engineering and Environmental Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Erinnerungen eines türkischen Staatsmannes

Autorzy:

Djemal, Ahmed Pascha.

Data publikacji:

1922

Wydawca:

M~uchen : Drei Masken Verlag

Tematy:

Djemal Achmed Pasza
I wojna światowa (1914-1918)
Operacja wojenna 1915-1916 r. dardanelska
Bitwa o Gallipoli (1915-1916)

Dostawca treści:

Bibliografia CBW

/5

Książka

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Skocz do pozycji: 65.

Tytuł:

Złudzenie triumfu : [dwa lata wojny z terroryzmem]

Autorzy:

Sid-Ahmed Mohamed.

Powiązania:

Forum 2003, nr 38, s. 18-19

Data publikacji:

2003

Tematy:

Terroryzm zwalczanie 2001-2003 r.

Opis:

Fot.; Tł. art. zamieszcz. w "Al-Ahram". --- 2003, 30 VII.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 66.

Tytuł:

Jak wyjść, nie tracąc twarzy : prędzej czy później trzeba będzie w Afganistanie zdecydować się na jedyną realną opcję : podzielenie się władzą z talibami

Autorzy:

Rashid, Ahmed (1948- ).

Powiązania:

Forum 2010, nr 25, s. 6-8

Data publikacji:

2010

Tematy:

ISAF (misja pokojowa) Afganistan udział Amerykanów
Talibowie Afganistan
Polityka międzynarodowa
Polityka zagraniczna

Opis:

Tł. art. zamieszcz. w "Der Spiegel". - 2010, 22 V.
Fot.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 67.

Tytuł:

Diagnosis of ITSC fault in the electrical vehicle powertrain system through signal processing analysis

Autorzy:

Ouamara, Dehbia
Boukhnifer, Moussa
Chaibet, Ahmed
Maidi, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/2174472.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

induction motor
electrical vehicle
fault diagnosis
inter-turn short circuit
extended Kalman filter
spectral analysis
fast Fourier transform
short-time Fourier transform
silnik indukcyjny
pojazd elektryczny
diagnostyka uszkodzeń
zwarcie międzyzwojowe
rozszerzony filtr Kalmana
analiza spektralna
szybka transformata Fouriera
krótkoczasowa transformata Fouriera

Opis:

The three-phase induction motor is well suited for a wide range of mobile drives, specifically for electric vehicle powertrain. During the entire life cycle of the electric motor, some types of failures can occur, with stator winding failure being the most common. The impact of this failure must be considered from the incipient as it can affect the performance of the motor, especially for electrically powered vehicle application. In this paper, the intern turn short circuit of the stator winding was studied using Fast Fourier transform (FFT) and Shor-Time Fourier transform (STFT) approaches. The residuals current between the estimated currents provided by the extended Kalman filter (EKF) and the actual ones are used for fault diagnosis and identification. Through FFT, the residual spectrum is sensitive to faults and gives the extraction of inter-turn short circuit (ITSC) related frequencies in the phase winding. In addition, the FFT is used to obtain information about when and where the ITSC appears in the phase winding. Indeed, the results allow to know the faulty phase, to estimate the fault rate and the fault occurrence frequency as well as their appearance time.

Źródło:

Diagnostyka; 2023, 24, 1; art. no. 2023113
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Gas turbine reliability estimation to reduce the risk of failure occurrence with a comparative study between the two-parameter Weibull distribution and a new modified Weibull distribution

Autorzy:

Djeddi, Ahmed Zohair
Hafaifa, Ahmed
Iratni, Abdelhamid
Kouzou, Abdellah

Powiązania:

https://bibliotekanauki.pl/articles/2096209.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

failure analysis
malfunction analysis
availability
reliability estimation
failure occurrence
maintenance plan
gas turbine
two-parameter Weibull
modified Weibull
analiza uszkodzeń
dostępność
ocena niezawodności
turbina gazowa

Opis:

Responding to the needs of quality and robustness of analysis and management of degradation of equipment, to increase their life cycle and to expand these facilities to become more and more sophisticated and agronomic. This work proposes a contribution to increase the survival of a gas turbine, installed in a gascompression plant, with a comparative study between the two-parameter Weibull distribution. A new modified Weibull distribution was proposed also to reduce the risk of occurrence of failure in this rotating machine. A Statistical analysis and validation on the synthesis of turbine's reliability data and failures were considered, with a particular focus on the use of this data to increase the availability of this type of machine. So, developing a maintenance plan based on their reliability indices for scheduled inspections.

Źródło:

Diagnostyka; 2022, 23, 1; 1--18
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Evaluating the connectivity level of Fayoum city roads network: a new method using GIS
Ocena poziomu spójności sieci dróg miejskich Fayoum: nowa metoda wykorzystująca GIS

Autorzy:

Saleh, Ahmed Younes
Abdu, Saeed Ahmed
Ali, Hanaa Nazer

Powiązania:

https://bibliotekanauki.pl/articles/2089773.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Gdański. Komisja Geografii Komunikacji Polskiego Towarzystwa Geograficznego

Tematy:

connectivity level
GIS
map algebra
network analysis
urban road network
poziom spójności
algebra mapy
analiza sieci
sieć dróg miejskich

Opis:

Road networks within cities are a vital component of the socio-economic development processes. Many countries have sought to examine and evaluate the efficiency of road networks within urban areas because of the increasing demand for transportation. Thus, networks should be evaluated to guide the development of transport systems and infrastructure within cities. This study evaluates the connectivity level of the road network parts in Fayoum city, Egypt, through the application of some indicators of connectivity measurement, such as Beta, Alpha, Gamma, Connectivity degree, and the density of edges and nodes. The study follows a new method for evaluation; it does not apply the indicators on the network as a whole; however, it divides the city into zones and calculates the indicators of each zone using the Arc GIS 10.2.1 program. The authors applied the map Algebra method to map the results of the six indicators in one index called the Total Connectivity Index (TCI). The TCI gives more consistent results than other indices, and it is more related to different spatial patterns of roads. According to this indicator, most of the city road network seem to have a good connectivity level, whereas the city marginal areas prove to have a poor connectivity level. Therefore, any efforts to develop or construct new roads should be in the marginal areas of the city.

Źródło:

Prace Komisji Geografii Komunikacji PTG; 2018, 21(4); 60-72
1426-5915
2543-859X

Pojawia się w:

Prace Komisji Geografii Komunikacji PTG

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Shear Strength Enhancement of Cemented Reinforced Sand: Role of Cement Content on the Macro-Mechanical Behavior

Autorzy:

Boutouba, Kheira
Benessalah, Ismail
Arab, Ahmed
Henni, Ahmed Djafar

Powiązania:

https://bibliotekanauki.pl/articles/178198.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

cemented reinforced sand
direct shear test
water content
curing time
dilatant character

Opis:

Sands reinforced by hydraulic binders (cement) have constituted in recent decades a major asset for the expansion of several areas of engineering. The mechanical behavior of sand-cement mixtures has undergone some controversies studied on the Chlef sand. In this paper, we present an experimental study to investigate the mechanical behavior of a sandy soil reinforced by a hydraulic binder (cement), using the direct shear apparatus emphasizing on the shear strength characteristics and the vertical deformation variation of cemented reinforced sand. The parameters used in this study are mainly: relative density (Dr = 80%), normal stress (σn = 100, 200, 400 kPa), water content (3, 7 and 10%), cement content (2.5, 5, 7.5 and 10 %) and cure time (7, 14 and 28 days). The experimental results show that the mechanical characteristics in terms of internal cohesion (C) and internal frication angle (φ) give a better mechanical performance with the binder inclusion, and the cure conditions play an effective role on the improvement of the shear strength. This result also showed that 10% of the cement content gave us a maximum value of shear strength and an optimal influence on the mechanical characteristics. The addition of cement not only improves the shear strength of soil, but also provides diversity in the resistance against the deformations imposed load, which can be established by a dilatant character.

Źródło:

Studia Geotechnica et Mechanica; 2019, 41, 4; 200-211
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Anaerobic Co-Digestion of Sewage Sludge and Waste in High Solid State

Autorzy:

Aboulfotoh, Ahmed M.
Marie, Ahmed I.
El-Hefny, Rehab

Powiązania:

https://bibliotekanauki.pl/articles/2105288.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

anaerobic co-digestion
thermal pretreatment
hydrolysis
waste
food waste
sludge

Opis:

In this study, the effect of thermal pre-treatment (TP) on the physical characteristics and co-digestion of a mixture of food waste and sludge was investigated. The food waste (FW) to sewage sludge (SS) ratio used in this research is 1:2 (VS-based) to form a final concentration of 11.20%. The inoculum to substrate ratio was set at 1:1 (volumebased). Undoubtedly, the results show that TP has changed the physical characteristics of the food waste to sewage sludge mixture. The results show that the pretreatment increased the biogas production from 4385 ml for the untreated reactor to 5685 for the reactor R2(140) at 140 °C and the improvement in biogas production reaches 29.65% in the reactor R2(140) and the removal of volatile solids was 58.90%. Therefore, after the biomethane potential test, the temperature of 140 °C was found to be optimal in the production of biogas. The optimal condition is to use a mixture of pre-treated SS at the temperature of 140 °C and untreated FW, so TP is recommended to be used in anaerobic digestion of the mixture of food waste and sewage sludge.

Źródło:

Journal of Ecological Engineering; 2022, 23, 6; 1--13
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Study the Recycling of Red Mud in Iron Ore Sintering Process

Autorzy:

Khalifa, Ahmed Abdelazim
Bazhin, Vladimir Yurievich
Kuskova, Yana Vadimovna
Abdelrahim, Ahmed
Ahmed, Yasser Momtaz Zaki

Powiązania:

https://bibliotekanauki.pl/articles/1838291.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

red mud
utilization
Egypt
iron ore
sintering process
sinter charge mixture
sinter strength
sinter production

Opis:

Red mud (RM), the by-product generated during the alumina extraction process, is considered a valuable secondary raw material, since iron (20–54%) represents its major constituent. Accordingly, the suitability of recycling this RM in the sintering process of Egyptian iron ore was studied. The effect of adding different amounts of RM to the sinter charge mixture (0–10 wt.%) on the sintering process performance as well as the chemical, physical and mechanical properties of the produced sinter was investigated. The results revealed that increasing the amount of red mud in the sinter charge mixture leads to a high improvement in the strength of the produced sinter till reaching a maximum at 7% addition, which deteriorates thereafter. Meanwhile, owing to the fine nature of the red mud, increasing its contents in the sinter charge mixture leads to reduced speed of the sintering process, which consequently affects the productivity at the blast furnace yard. The sinter produced with the addition of 3% red mud shows the highest reducibility. These results indicate the suitability of recycling RM in the Egyptian iron ore sintering process with an amount not higher than 3 wt.% of the total sinter mixture charge.

Źródło:

Journal of Ecological Engineering; 2021, 22, 6; 191-201
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Study the Recycling of Red Mud in Iron Ore Sintering Process

Autorzy:

Khalifa, Ahmed Abdelazim
Bazhin, Vladimir Yurievich
Kuskova, Yana Vadimovna
Abdelrahim, Ahmed
Ahmed, Yasser Momtaz Zaki

Powiązania:

https://bibliotekanauki.pl/articles/1838357.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

red mud
utilization
Egypt
iron ore
sintering process
sinter charge mixture
sinter strength
sinter production

Opis:

Red mud (RM), the by-product generated during the alumina extraction process, is considered a valuable secondary raw material, since iron (20–54%) represents its major constituent. Accordingly, the suitability of recycling this RM in the sintering process of Egyptian iron ore was studied. The effect of adding different amounts of RM to the sinter charge mixture (0–10 wt.%) on the sintering process performance as well as the chemical, physical and mechanical properties of the produced sinter was investigated. The results revealed that increasing the amount of red mud in the sinter charge mixture leads to a high improvement in the strength of the produced sinter till reaching a maximum at 7% addition, which deteriorates thereafter. Meanwhile, owing to the fine nature of the red mud, increasing its contents in the sinter charge mixture leads to reduced speed of the sintering process, which consequently affects the productivity at the blast furnace yard. The sinter produced with the addition of 3% red mud shows the highest reducibility. These results indicate the suitability of recycling RM in the Egyptian iron ore sintering process with an amount not higher than 3 wt.% of the total sinter mixture charge.

Źródło:

Journal of Ecological Engineering; 2021, 22, 6; 191-201
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

DESIGN, SYNTHESIS AND ANTICANCER ACTIVITY EVALUATION OF NEW QUINAZOLINE DERIVATIVES LINKED TO THIAZOLIDINONE, AZETIDINONE OR OXADIAZOL MOIETIES

Autorzy:

Ahmed, Marwa
Magdy, Naja

Powiązania:

https://bibliotekanauki.pl/articles/895415.pdf

Data publikacji:

2018-12-31

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

cytotoxicity
MCF-7
quinazoline
CASP3

Opis:

Novel series of 4-substituted 6,8-dibromo-2-(4-chloro-phenyl)-quinazoline have been designed and synthesized. All new derivatives were tested in vitro against MCF-7. Compounds Xc and XIb exerted powerful cytotoxic activity with low IC50 (6.3 and 6.9 µM) compared to doxorubicin 7.72 µM. Compounds Xa, IXb and IXc showed moderate cytotoxic effects with IC50 range (10.0 – 16.7) µM, respectively. Compounds IXa, XIc, XIa, VIIb, VIIIc, Xb and VIIIa showed promising cytotoxic effects with IC50 range (20.3 – 40 µM, respectively. ). Exploring their apoptotic effect; all compounds activated apoptotic cascade in MCF-7. Compounds Xc and XIb increased CASP3 activity more than doxorubicin.

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 6; 1321-1328
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Design, synthesis and biological evaluation of some novel substituted quinazoline derivatives as antitumor agents.

Autorzy:

Ahmed, Marwa
Magdy, Naja

Powiązania:

https://bibliotekanauki.pl/articles/895417.pdf

Data publikacji:

2018-06-30

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

cytotoxicity
quinazoline
Tyrosine kinases

Opis:

New series of 6,8-dibromo-2-(4-chlorophenyl)quinazolin-4-yloxy derivatives were synthesized and their cytotoxic activity on MCF7, HEPG2 and HCT116 cell lines were evaluated. Compound XI and XIIIb were two times more active than doxorubicin on MCF7 cancer cell line. Compound VIIIa was 3 times more active than doxorubicin on HEPG2 cancer cell line. While compounds XII, XIIIa and XIIIb were more potent than doxorubicin on HCT116 cancer cell line. IC50 of all newly synthesized compounds were evaluated in vitro for thier inhibition to EGFR tyrosine kinase. All compound show good inhibitory activity on EGFR tyrosine kinase with IC50 range (6.19-19.87) µM.

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 3
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Using RUSLE and GIS for the soil loss assessment in arid regions: The case of the Ain Sefra catchment in the Ksour Mountains, Algeria

Autorzy:

Melalih, Ahmed
Mazour, Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/1844352.pdf

Data publikacji:

2021

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

Ain Sefra watershed
Algeria
arid region
GIS
RUSLE
soil erosion

Opis:

The loss of soil quality due to erosion is a global problem, particularly affecting natural resources and agricultural production in Algeria. In this study, the Revised Universal Soil Loss Equation (RUSLE) is applied to estimate the risk of water erosion in the Ain Sefra arid watershed (Algeria). The coupling of this equation with Geographic Information Systems (GIS) allows to assess and map the soil loss rates. The land erosion is influenced by many control variables, such as the topographic factor of the terrain and the length of slope (LS factor), rainfall erosivity (R factor), sensitivity of soil to erosion (K factor), presence of vegetation (C factor) and the antierosion cultivation techniques (P factor). To calculate the average annual soil loss, these five factors were considered and multiplied in the RUSLE Equation. The result shows that the average rate of soil loss is estimated at about 5.2 t·ha–1·y–1 over the whole watershed. This study is the first of its kind in the region and aims to assess the soil loss caused by water erosion processes in this arid zone. Consequently, it is essential to take real intervention measures in these upstream areas in order to combat this scourge, based on priorities ensuring the sustainable management of natural resources in the study area.

Źródło:

Journal of Water and Land Development; 2021, 48; 205-214
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: 77.

Tytuł:

Environmental Quality Management through Parshall Flume Aeration Efficiency Modelling

Autorzy:

Hamed, Mohamed Ahmed Reda

Powiązania:

https://bibliotekanauki.pl/articles/2202322.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

aeration efficiency
dissolved oxygen
environmental life sustainability
Parshall flume
water quality

Opis:

The dissolved oxygen content in surface waters is one of the vital indicators for human water quality usage as well as the aquatic plant and animal environmental life sustainability. Parshall flumes are one of the important ejector devices that are successfully used for oxygen requirement satisfying in various irrigation, wastewater, and ecosystems. However, the present study aimed to manage and improve various waterworks aeration efficiency through integrated modeling of experimental and analytical analysis as well as their operation conditional parameters for the Parshall flumes configuration. On the basis of the experiment work data sets run results, the principal component regression (PCR), partial least squares (PLS), and ridge regression (RR) techniques are used to develop the required aeration efficiency prediction models for such aerators by interrelating the impact of Parshall flumes characteristics and configurations, as well as various water flow rates on aeration efficiency. The predictive models developed in the study were statistically compared to the experimental data. The comparison confirms a good reliability and high accuracy. Considering the proposed aeration models, the optimum design of the new Parshall flumes can be successfully facilitated.

Źródło:

Journal of Ecological Engineering; 2023, 24, 2; 124--130
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Estimation of Per Capita Loading and Treated Wastewater Quality Index in Sharkia Governorate, Egypt

Autorzy:

Aboulfotoh, Ahmed
Heikal, Ghada

Powiązania:

https://bibliotekanauki.pl/articles/2086401.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

domestic wastewater
evaluation
per capita loading
water quality
WWQI
wastewater quality index
WWTP
wastewater treatment plant

Opis:

Monthly reports from June 2017 to May 2018 of Twenty-one wastewater treatment plants in Sharkia were evaluated for the following parameters: temperature, pH, total dissolved solids (TDS), total suspended solids (TSS), chemical oxygen demand (COD), biochemical oxygen demand (BOD), nitrate (NO3), oil and grease (O&G) and Dissolved Oxygen (DO) values. The first aim of this study was to estimate the main wastewater per capita pollution generation per day (PCPL) and found that the 90th percentile PCPL for TSS, COD, BOD, NO3 and O&G were equal to 57.42, 91.59, 59.13, 1.64 and 12.39 (g/capita/day) respectively. The second aim was to assess the performance of the WWTPs in the governorate, by calculating of the wastewater quality index (WWQI) of each plant and for the entire governorate which shows that; 2 WWTPs gives a good performance, 9 WWTPs gives a fair performance, 9 WWTPs gives a marginal performance and 1 WWTP is in bad conditions, the average performance all over the governorate is considered marginal. A simple empirical formula had been established to be used for calculation of the WWQI based on the tested parameters using the multiple linear regression and found to be very effective in predicting the WWQI for the WWTPs.

Źródło:

Journal of Ecological Engineering; 2022, 23, 5; 73--80
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Heat transfer analysis of non-Newtonian natural convective fluid flow using Homotopy Perturbation and Daftardar-Gejiji & Jafari Methods

Autorzy:

Adeleye, Olurotimi
Yinusa, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/122431.pdf

Data publikacji:

2019

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

non-Newtonian fluid
natural convection
vertically infinite plates
Daftardar-Gejiji & Jafari Method
DJM
Homotopy Perturbation Method
HPM
ciecz nieniutonowska
konwekcja naturalna
metoda Daftardar-Gejiji i Jafari
metoda perturbacji homotopii

Opis:

In this paper, the analytical solution of natural convective heat transfer of a non-Newtonian fluid flow between two vertical infinite plates using the Homotopy Perturbation Method (HPM) and Daftardar-Gejiji & Jafari Method (DJM) is presented. The heat transfer problem of natural convection is observed in many engineering fields including geothermal systems, heat exchangers, petroleum reservoirs, nuclear waste reserves, etc. The problem which is modelled as fully coupled nonlinear ordinary differential equations requires special analytical techniques for its solution. The solutions are obtained using an exact analytical method: the Homotopy Perturbation Method (HPM) and a semi-analytical method: the Daftardar-Gejiji & Jafari Method (DJM). These solutions are compared with solutions obtained from the Runge-Kutta numerical method. The results are in good agreement with the numerical solutions. The effects of the Eckert number, Prandtl number and the non-Newtonian fluid viscosity parameter on the non-dimensional temperature and velocity of the fluid are investigated. The results obtained from the analytical method show that the method can be applied to predict excellent results of the problem and can be used for parametric studies of the problem. From the results, it is shown that when the Prandtl number and the Eckert number are increased, there is an increase in both temperature and fluid flow velocity.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 2; 5-18
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Extended results of the Hadamard product of simple sets of polynomials in hypersphere

Autorzy:

Ahmed, A. El-Sayed

Powiązania:

https://bibliotekanauki.pl/articles/746574.pdf

Data publikacji:

2006

Wydawca:

Polskie Towarzystwo Matematyczne

Tematy:

Basic sets of polynomials
Hadamard product
several complex variables

Opis:

In this paper we study some extended results of the Hadamard product set for several simple monic sets of polynomials of several complex variables in hyperspherical regions, then we obtain the effectiveness conditions for this Hadamard product in hyperspherical regions.

Źródło:

Commentationes Mathematicae; 2006, 46, 2
0373-8299

Pojawia się w:

Commentationes Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Consistently Trained Artificial Neural Network for Automatic Ship Berthing Control

Autorzy:

Ahmed, Y.
Hasegawa, K.

Powiązania:

https://bibliotekanauki.pl/articles/116809.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

Port Maneuvres
Artificial Neural Network (ANN)
Automatic Ship Berthing Control
Ship Berthing
Automatic Ship Berthing
Monte Carlo simulation
Autonomous Underwater Vehicle (AUV)
Teaching Data Creation

Opis:

In this paper, consistently trained Artificial Neural Network controller for automatic ship berthing is discussed. Minimum time course changing manoeuvre is utilised to ensure such consistency and a new concept named ‘virtual window’ is introduced. Such consistent teaching data are then used to train two separate multi-layered feed forward neural networks for command rudder and propeller revolution output. After proper training, several known and unknown conditions are tested to judge the effectiveness of the proposed controller using Monte Carlo simulations. After getting acceptable percentages of success, the trained networks are implemented for the free running experiment system to judge the network’s real time response for Esso Osaka 3-m model ship. The network’s behaviour during such experiments is also investigated for possible effect of initial conditions as well as wind disturbances. Moreover, since the final goal point of the proposed controller is set at some distance from the actual pier to ensure safety, therefore a study on automatic tug assistance is also discussed for the final alignment of the ship with actual pier.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 3; 417-426
2083-6473
2083-6481

Pojawia się w:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Beta transmuted Lomax distribution with applications

Autorzy:

Hurairah, Ahmed
Alabid, Abdelhakim

Powiązania:

https://bibliotekanauki.pl/articles/1363592.pdf

Data publikacji:

2020-06-05

Wydawca:

Główny Urząd Statystyczny

Tematy:

Lomax distribution
beta Lomax distribution
transmuted distribution
maximum likelihood estimation

Opis:

In this paper we propose and test a composite generalizer of the Lomax distribution .The genesis of the beta distribution and transmuted map is used to develop the so-called beta transmuted Lomax (BTL) distribution. The properties of the distribution are discussed and explicit expressions are derived for the moments, mean deviations, quantiles, distribution of order statistics and reliability. The maximum likelihood method is used for estimating the model parameters, and the finite sample performance of the estimators is assessed by simulation. Finally, the authors demonstrate the usefulness of the new distribution in analysing positive data.

Źródło:

Statistics in Transition new series; 2020, 21, 2; 13-34
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Designing an upper stage steering system for a formula FSAE car

Autorzy:

Wheatley, Greg
Ali, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/2091236.pdf

Data publikacji:

2021

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

design
steering
race car
projekt
układ kierowniczy
samochód wyścigowy

Opis:

The objective of this work is to design an upper stage steering system for the Formula FSAE car “Omega” that will effectively translate driver input force to the rack and pinion. The system consists of a steering wheel, steering shafts, universal joints, a quick release mechanism, and connection points to the car. Critical loads have been determined, and the final design has been validated using finite element analysis to ensure the safety of the assembly during normal operation and worst-scenario cases. The design key factors were performance, weight, cost, ergonomics, maintainability, manufacturability and reliability.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 113; 205--218
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Shifter mechanism design for FSAE motor sports vehicle JCU

Autorzy:

Wheatley, Greg
Ali, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/2091242.pdf

Data publikacji:

2021

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

mechanical shifter
solid linkage
spline attachments
FEA
mechaniczna skrzynia biegów
trwałe połączenie
mocowanie wielowypustowe
MES

Opis:

This report provides a design analysis of a replacement’s shifter mechanism for the 2014 model JCU Motorsports FSAE vehicle. Common FSAE shifter mechanisms were researched and reviewed to provide a better understanding of the needs required. A design approach was constructed to ultimately design a mechanism that conformed to all existing constraints and FSAE rules. Realistic load cases were identified and employed in the FEA analysis of the design. Supporting hand calculations were developed, proving the analysis to be accurate. Results showed the shifter mechanism does not fail under infinite life, with some parts of the design having a reasonably high safety factor, ensuring stability.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 113; 219--229
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Application of uniform test design in optimizing the flotation reagents of iron anionic reverse flotation circuit

Autorzy:

Hou, Ying
Sobhy, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/2146945.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

iron oxide
quartz
uniform test design
reverse flotation
optimization
flotation reagents

Opis:

Most iron reserves are low in grade with quartz as the main gangue mineral, and anionic reverse flotation has become the most crucial separation method in the processing plants of iron ore. Thus, a flotation feed sample that is a mixture of low-intensity and high-gradient magnetic separators concentrates was acquired from a processing plant. The sample characterizations with X-ray diffraction (XRD), X-ray fluorescence (XRF), laser particle size analyzer, and mineral liberation analysis (MLA) confirmed that the sample consists of iron oxide as a valuable mineral and quartz as a gangue mineral with adequate liberation degree. In the anionic reverse flotation, the interaction of the flotation reagents with the constituents of the feed makes the flotation a complex system. Thus, the selection and optimization of regent dosages were performed using a uniform experimental design to estimate the optimum separation efficiency. The optimum reagent system was 1.6 kg/Mg starch depressant, 1.0 kg/Mg calcium oxide (lime) activator, and 0.8 kg/Mg TD-II anionic collector. At the optimum, 68.90% iron grade with 92.62% recovery was produced.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 1; 37--49
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Urban traffic incident management, using network analysis to improve the evacuation time to healthcare facilities

Autorzy:

Saker, Adel
Akakba, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/24201208.pdf

Data publikacji:

2023

Wydawca:

Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie

Tematy:

road accident
network analysis
health facilitie
evacuation time
Biskra
Algeria
wypadek drogowy
analiza sieci
służba zdrowia
czas ewakuacji
Algieria

Opis:

The city of Biskra is ranked the second city in Algeria with the highest traffic accident rate. There are multiple causes of accidents that derive from the diversity of traffic. In addition, its geographical location as a crossroads between the northeast and the south of Algeria is a major factor. Biskra is also considered a commercial and industrial city that receives daily large flows of travellers and merchandise. Traffic accidents are a complex problems that is dealt with in several approaches. In this research, from a geographical point of view, we will contribute to improve the trajectory of intervention and evacuation. Therefore, this research paper aims to create a geodatabase including the road network with associated entities to carry out spatiotemporal analyses and evaluate the service area of health facilities in terms of the nearest path. This paper uses GIS tools for evacuation to the public hospital employing a Network Analyst. This study may serve as a decision-making aid for the local authorities of this city in terms of evacuation and intervention in the event of a road accident. It provides real-time information on the location of the accident and the nearest path along with an estimated time. The outputs of these analyses can determine a map of accessibility, which allows for training in order to improve the real-time evacuation. As a result, this approach will lead to the reduction of evacuation time by less than 10 minutes, and thus leading to a decrease in the number of fatalities.

Źródło:

Geomatics, Landmanagement and Landscape; 2023, 3; 109--119
2300-1496

Pojawia się w:

Geomatics, Landmanagement and Landscape

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Czy to początek reanimacji : Irak konstytucyjny

Autorzy:

Ahmed, Abu.

Powiązania:

Gazeta Wyborcza 2004, nr 58, s. 8

Współwytwórcy:

Smol. Opracowanie

Data publikacji:

2004

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 88.

Tytuł:

Exploring the key determinants of organizational management
Badanie kluczowych determinantów zarządzania organizacyjnego

Autorzy:

Ahmed, Umair
Alkashami, Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/27315264.pdf

Data publikacji:

2022

Wydawca:

Politechnika Częstochowska

Tematy:

leadership style
employee engagement
organizational behavior
employee activeness
styl przywództwa
zaangażowanie pracowników
zachowania organizacyjne
aktywność pracowników

Opis:

This study aims to investigate the impact of leadership style and employee engagement on the employee activeness and organizational behavior of the petroleum industry in Bahrain. The objectives also show the investigation of mediating role of employee activeness among the links of leadership style, employee engagement and organizational behavior of the petroleum industry in Bahrain. Examining the moderating impact of customer satisfaction among the relationships between employee activeness and organizational behavior is also part of the current study goals. The results exposed that leadership style and employee engagement have a significant association with employee activeness, and leadership style has a significant association with organizational behavior. The findings also indicated that employee activeness significantly mediates the nexus of leadership style, employee engagement and organizational behavior of the petroleum industry in Bahrain. This study has guided the regulators while formulating policies related to the organizational function that enhance organizational performance.
Niniejsze opracowanie ma na celu zbadanie wpływu stylu przywództwa i zaangażowania pracowników na aktywność pracowników i zachowania organizacyjne przemysłu naftowego w Bahrajnie. Cele pokazują również zbadanie pośredniczącej roli aktywności pracowników wśród powiązań stylu przywództwa, zaangażowania pracowników i zachowań organizacyjnych przemysłu naftowego w Bahrajnie. Badanie moderującego wpływu satysfakcji klienta na relacje między aktywnością pracowników a zachowaniami organizacyjnymi jest również częścią obecnych celów badania. Wyniki ujawniły, że styl przywództwa i zaangażowanie pracowników mają istotny związek z aktywnością pracowników, a styl przywództwa ma istotny związek z zachowaniem organizacyjnym. Wyniki wskazują również, że aktywność pracowników znacząco pośredniczy w powiązaniu stylu przywództwa, zaangażowania pracowników i zachowań organizacyjnych przemysłu naftowego w Bahrajnie. Niniejsze badanie kierowało regulatorami podczas formułowania polityk związanych z funkcją organizacyjną, które poprawiają wydajność organizacji.

Źródło:

Polish Journal of Management Studies; 2022, 25, 2; 21--35
2081-7452

Pojawia się w:

Polish Journal of Management Studies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Experimental Investigation of the Effect of Suction Valve Opening on the Performance and Detection of Cavitation in the Centrifugal Pump Based on Acoustic Analysis Technique

Autorzy:

Al-Obaidi, Ahmed Ramadhan

Powiązania:

https://bibliotekanauki.pl/articles/176672.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

centrifugal pump
cavitation
suction valve opening
acoustic analysis technique

Opis:

The pump performance and occurrence of cavitation directly depends on different operating conditions. To cover a wide range of operation conditions for detecting cavitation in this work, investigations on the effect of various suction valve openings on cavitation in the pump were carried out. In order to analyse various levels of cavitation in different operation conditions, the effect of the decrease in the inlet suction pressure of the centrifugal pump by controlling the inlet suction valve opening was investigated using this experimental setup. Hence, the acoustic and pressure signals under different inlet valve openings and different flow rates, namely, 103, 200, 302 l/min were collected for this purpose. A detailed analysis of the results obtained from the acoustic signal was carried out to predict cavitation in the pump under different operating conditions. Also, the acoustic signal was investigated in time domain through the use of the same statistical features. The FFT technique was used to analyse the acoustic signal in the frequency domain. In addition, in this work an attempt was made to find a relationship between the cavitation and noise characteristics using the acoustic technique for identifying cavitation within a pump.

Źródło:

Archives of Acoustics; 2019, 44, 1; 59-69
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Evaluation of the electronic port right of way payment information system

Autorzy:

Bensfia, Chafik
Bouklata, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/27315568.pdf

Data publikacji:

2023

Wydawca:

STE GROUP

Tematy:

evaluation of the information system
electronic payment
information system

Opis:

In a connected and uncertain world, where almost two thirds of the world's population are now online, the integration of digital tools in the social and economic context is becoming a priority and an imposed choice for any organization. As a result, the strategic position of the Information System (IS) in these organizations is necessarily linked to performance. The creation of added value or net benefits through the use of these platforms becomes an ultimate and strategic objective for any organization. This study evaluates the success of the information system (IS) for electronic payment of port fees. From a quantitative approach of a hypothetico-deductive nature and using partial least squares structural equation modeling (PLS-SEM), we found that the success of the IS implies a quality of the electronic payment system, as well as the information produced influences the use and satisfaction of the users and finally these last two findings impact the individual and organizational performance of the organizations. (Net benefits).

Źródło:

Management Systems in Production Engineering; 2023, 3 (31); 254--262
2299-0461

Pojawia się w:

Management Systems in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

The effect of microbubbles on coarse particle anionic flotation: analysis and optimization

Autorzy:

Abbaker, Ahmed
Aslan, Nevzat

Powiązania:

https://bibliotekanauki.pl/articles/27323659.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

coarse particle
microbubble
anionic collector
optimization
statistical analysis

Opis:

Since the grinding and chemical reagents required for flotation are expensive, coarse particle flotation reduces grinding costs and makes the subsequent process more accessible and cheaper. Recent studies suggest that the flotation of coarse particles using microbubbles has some advantages. However, a thorough analysis of the effectiveness of various flotation parameters and the impact of their interactions on the recovery of coarse particles in the presence and absence of microbubbles has yet to be fully understood. In the current study, the two-level factorial and Box-Behnken experimental designs were performed to characterize, assess, and optimize the implications of seven numerical (sodium oleate, collector; calcium oxide, activator; MIBC, frother; impeller speed; froth depth; pulp concentration; fine particles) and one categorical (microbubbles) independent parameters on the coarse quartz particles. Characterization revealed that froth depth did not significantly affect the flotation recovery of coarse particles in the mechanical laboratory cell. The effects of the variables in the presence of microbubbles revealed that sodium oleate and impeller speed significantly impacted recovery, followed by calcium oxide and fine particles, both of which had a medium influence, and MIBC and pulp concentration, which had a minimal impact. The recovery of coarse particles increased by 92.714% when microbubbles were used, compared to the estimated maximum recovery under ideal conditions of 62.258% without them. From this, it can be concluded that a high coarse particle flotation recovery is possible by optimizing the hydrodynamic conditions and the chemical environment using microbubbles.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172298
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Microarray-core based circular photonic crystal fiber for high chemical sensing capacity with low confinement loss

Autorzy:

Asaduzzaman, S.
Ahmed, K.

Powiązania:

https://bibliotekanauki.pl/articles/174575.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

circular photonic crystal fiber
confinement loss
elliptical core
chemical sensor
relative sensitivity

Opis:

In this article, a circular photonic crystal fiber based chemical sensor has been presented where core region is designed with an array of elliptical holes. The proposed structure is numerically investigated by using a full vectorial finite element method. From the numerical results, it is observed that introducing an array of elliptical holes helps to obtain the high relative sensitivity and realizes a low confinement loss. In addition, the increase in the value of the diameter of holes in the innermost ring enhances the relative sensitivity. Moreover, the increase in the value of the diameter of holes in the outermost ring reduces the confinement loss. In this work, we have considered an industrially valuable chemical ethanol. Simulation results disclose that the highest relative sensitivity of proposed photonic crystal fiber is 29.25% for ethanol and the confinement loss is 7.68 × 10^–7 dB/m at the wavelength 1.5 µm.

Źródło:

Optica Applicata; 2017, 47, 1; 41-49
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

The effect of ARCS motivational model on achievement motivation and academic achievement of the tenth grade students

Autorzy:

Thaer, Ahmed
Thaer, Ghbari

Powiązania:

https://bibliotekanauki.pl/articles/2005068.pdf

Data publikacji:

2016-03-31

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

achievement
ARCS model
motivation

Opis:

The presented study aimed at examining the effect of ARCS model on the Achievement Motivation (AM) and Academic Achievement (AA) of the tenth grade students. One hundred and thirteen tenth grade students (28 male, 85 female), divided into two groups (experimental = 50, control = 63), studied a unit about magnetism with the use of two different methods, an ARCS model and a traditional model for 2 weeks. Two instruments were used, a Motivation Achievement Test (MAT) and an Achievement Test (AT). The results showed that there were significant differences on the MAT and AT due to the implemented ARCS motivational model.

Źródło:

The New Educational Review; 2016, 43; 68-77
1732-6729

Pojawia się w:

The New Educational Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Lightweight Security Mechanism to Mitigate Active Attacks in a Mobile Ad-hoc Network

Autorzy:

Ahmed, Uthumansa
Shantha, Fernando

Powiązania:

https://bibliotekanauki.pl/articles/2055257.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Blackhole
lightweight
mechanism
security
simulation

Opis:

Mobile Ad hoc Network (MANET) is a type of Ad hoc network. General properties of MANET open the network to various security threats. Network layer-based Active attacks are widespread and destructive. Available security solutions contain complex calculations. Therefore, the objective of this research is to propose a lightweight security mechanism to enhance the security of data communications between source and destination nodes in a MANET from network layer-based active attack. Blackhole is used as a network layer-based Active attack. The network performance is evaluated using Packet Delivery Ratio (PDR), Average End-to-End Delay (AEED), Throughput, and Simulation Processing Time at Intermediate Nodes (SPTIN). The controller network was used to compare the performance of each network. During the experiment due to the impact of the blackhole attack, compared to the controller network, the PDR was found to be 0.28%, AEED was infinity and Throughput was 0.33%. The performance of the proposed security mechanism was compared with that of the controller network, and the values of PDR, AEED, Throughput, and SPTIN were found to be 98.0825%, 100.9346%, 99.9988%, and 96.5660%, respectively. The data packet delivery ratio was 100.00% compared to that of the controller network. The network that was affected by a blackhole attack showed a higher amount of ADDR than the controller network and the lowest amount of PDR. The network that was affected by the blackhole showed underperformance compared to the controller network. The proposed security mechanism performs well in PDR, AEED, and Throughput compared to the controller network. The AEED and SPTIN values prove that the proposed solution is free from complex calculations. The scope of the solution can be expanded into a lightweight Intruder Detection System to handle different types of security attacks in MANETs.

Źródło:

International Journal of Electronics and Telecommunications; 2022, 68, 1; 145--152
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Response Time Estimation in Robotics Using Hierarchical Performance Modeling Approach

Autorzy:

Alsheikhy, Ahmed
Almutiry, Muhannad

Powiązania:

https://bibliotekanauki.pl/articles/2023696.pdf

Data publikacji:

2021

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

framework
robotics
automation
response time
rama
robotyka
automatyzacja
czas reakcji

Opis:

The Multi-disciplinary domain of robotics has become instrumental in advancements in many fields such as medical, military and industrial automation. They are used to ensure reliability, stability and precision. Particularly, they are preferred to be used in an environment where uncertainties and disturbances occur. Measuring or estimating a performance metric such as response time or throughput under severe circumstances is crucial since designers want to know the behavior of robots and their reaction when a constrained condition is applied. The present research applies the framework proposed earlier on a robotic manipulator to predict a performance metric, this paper considers only the execution time which is also known as the response time. In addition, a comparison is performed between predicted and actual values. All values herein are average ones. A simulation system in MATLAB is used to find out the differences between the predicted and actual values. Results demonstrate that the proposed framework is capable of finding the needed metric or metrics and determining/spotting bottleneck(s) inside any system under consideration as it has been verified by several experiments.

Źródło:

Advances in Science and Technology. Research Journal; 2021, 15, 4; 14-20
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

WIKIS IN EFL WRITING CLASSES IN SAUDI ARABIA: IDENTIFYING INSTRUCTORS’ REFLECTIONS ON MERITS, DEMERITS AND IMPLEMENTATION

Autorzy:

Khateeb, Ahmed A. Al

Powiązania:

https://bibliotekanauki.pl/articles/955902.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group

Tematy:

web 2
0
social learning
merits
demerits
implementation
reflections

Opis:

This paper presents the pre-and-post-reflections of English language instructors concerning the incorporation of a new pedagogy in English as foreign language (EFL) writing classes in the Kingdom of Saudi Arabia. This approach is to integrate and blend wiki-mediated writing into a different course plan, with tasks that fit with the normal syllabi used for teaching writing skills. The methodology took a qualitative approach, specifically by conducting semi-structured pre-and-post-interviews. The qualitative analysis focused on the most frequent themes which occur in both cohorts. The participants, who were faculty members in the chosen institution, gave their reflections after they were shown the processes, thoughts and outcomes produced by the participants who actually applied the course and relevant tasks. It is important to identify instructors’ perspectives as this practice can be applied to enhance (novice) non-native learners of writing in English for academic purposes (EAP). Accordingly, this paper intends to shed light on three vital elements: merits, demerits and some principles for implementation.

Źródło:

Teaching English with Technology; 2013, 13, 4; 3-22
1642-1027

Pojawia się w:

Teaching English with Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Sur les elements bornants et les ideaux formes delements bornants joints dans les algebres bornologiques

Autorzy:

Zinedine, Ahmed
Tajmouati, Abdelaziz

Powiązania:

https://bibliotekanauki.pl/articles/746663.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Matematyczne

Tematy:

permanently singular elements, bounding elements, non-removable ideals, ideals consisting of joint bounding elements

Opis:

Bounding elements and ideals consisting of joint bounding elements were essential tools in the study of permanent singularity in the class of all bornological algebras ([1], [6], [7], [8] and [12]). In this paper we give some important properties of these two notions. Especially, we compare boundings elements with some similar known notions such as bornological divisors of zero and topological divisors of zero. Then we show that these elements can be seen as algebraic divisor of zero in some suitable extension of the initial algebra. This result is analogous to a well-known result of Żelazko [11] concerning topological divisors of zero in Banach algebras. Finaly, we show that a maximal ideal is a prime ideal among ideals consisting of joint bounding elements. This is analougous to the result given in [4] concerning ideals consisting of joint topological divisors of zero in the case of Banach algebras.

Źródło:

Commentationes Mathematicae; 2013, 53, 1
0373-8299

Pojawia się w:

Commentationes Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Variations on a sufficient condition for Hamiltonian graphs

Autorzy:

Ainouche, Ahmed
Lapiquonne, Serge

Powiązania:

https://bibliotekanauki.pl/articles/743758.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

cycles
partially square graph
degree sum
independent sets
neighborhood unions and intersections
dual closure

Opis:

Given a 2-connected graph G on n vertices, let G* be its partially square graph, obtained by adding edges uv whenever the vertices u,v have a common neighbor x satisfying the condition $N_G(x) ⊆ N_G[u] ∪ N_G[v]$, where $N_G[x] = N_G(x) ∪ {x}$. In particular, this condition is satisfied if x does not center a claw (an induced $K_{1,3}$). Clearly G ⊆ G* ⊆ G², where G² is the square of G. For any independent triple X = {x,y,z} we define
σ̅(X) = d(x) + d(y) + d(z) - |N(x) ∩ N(y) ∩ N(z)|.
Flandrin et al. proved that a 2-connected graph G is hamiltonian if [σ̅]₃(X) ≥ n holds for any independent triple X in G. Replacing X in G by X in the larger graph G*, Wu et al. improved recently this result. In this paper we characterize the nonhamiltonian 2-connected graphs G satisfying the condition [σ̅]₃(X) ≥ n-1 where X is independent in G*. Using the concept of dual closure we (i) give a short proof of the above results and (ii) we show that each graph G satisfying this condition is hamiltonian if and only if its dual closure does not belong to two well defined exceptional classes of graphs. This implies that it takes a polynomial time to check the nonhamiltonicity or the hamiltonicity of such G.

Źródło:

Discussiones Mathematicae Graph Theory; 2007, 27, 2; 229-240
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

The hermitian operators on some Banach spaces

Autorzy:

Berkson, Earl
Sourour, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/1385956.pdf

Data publikacji:

1974

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Źródło:

Studia Mathematica; 1974-1975, 52, 1; 33-41
0039-3223

Pojawia się w:

Studia Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Abstract inclusions in Banach spaces with boundary conditions of periodic type

Autorzy:

Guedda, Lahcene
Hallouz, Ahmed

Powiązania:

https://bibliotekanauki.pl/articles/729484.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

measure of noncompactness
condensing operator
nonlinear abstract inclusion
accretive operator
integral solution
nonlinear semigroup

Opis:

We study in the space of continuous functions defined on [0,T] with values in a real Banach space E the periodic boundary value problem for abstract inclusions of the form
⎧ $x ∈ S(x(0), sel_{F}(x))$
⎨
⎩ x (T) = x(0),
where, $F:[0,T] × → 2^E \∅$ is a multivalued map with convex compact values, ⊂ E, $sel_{F}$ is the superposition operator generated by F, and S: × L¹([0,T];E) → C([0,T]; ) an abstract operator. As an application, some results are given to the periodic boundary value problem for nonlinear differential inclusions governed by m-accretive operators generating not necessarily a compact semigroups.

Źródło:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2014, 34, 2; 229-253
1509-9407

Pojawia się w:

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Dostawca treści:

Biblioteka Nauki

/5

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