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Wyświetlanie 1-15 z 175
Tytuł:
The impact of freight rates on ship values: An investigation of major dry bulk carriers
Autorzy:
Açik, Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/1818731.pdf
Data publikacji:
2021
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
freight rates
secondhand value
newbuilding value
economic life
Capesize
Panamax
Handymax
Opis:
Many factors affect ship values, but the most important is freight rates. This effect is more dynamic, especially in the dry bulk market, which has characteristics close to a perfectly competitive market. The literature does not provide a complete answer about whether the effects of freight on ship values differ by ship type and age in the market; therefore, this study examined the effect of changes in the freight rates of the main ship types used in the dry bulk market on their values in different age groups. The ship types included in the study are Capesize, Panamax, and Handymax vessels, while the age groups are newbuilds, 5-year-old, and 10-year-old ships. Individual regression models were established and analyses were applied for each category. According to the obtained results, smaller vessels were more affected by changes in freight rates, and the effect of changes in freight rate increased with the age of the ship. Also, the price volatility of smaller ships was lower, while it was higher for older ships. It is hoped that these results may provide comparative results by ship type and guide industry stakeholders in reducing risks.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 66 (138); 9-20
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth of a polynomial not vanishing in a disk
Autorzy:
Mir, Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/2078964.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Polynomial
maximum modulus principle
zeros
Opis:
This paper deals with the problem of finding some upper bound estimates for the maximum modulus of the derivative and higher order derivatives of a complex polynomial on a disk under the assumption that the polynomial has no zeros in another disk. The estimates obtained strengthen the well-known inequality of Ankeny and Rivlin about polynomials.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2019, 73, 1; 41-48
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some inequalities for maximum modulus of rational functions
Autorzy:
Mir, Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/2078965.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Rational function
polynomial
poles
zeros
Opis:
In this paper, we establish some inequalities for rational functions with prescribed poles and restricted zeros in the sup-norm on the unit circle in the complex plane. Generalizations and refinements of rational function inequalities of Govil, Li, Mohapatra and Rodriguez are obtained.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2019, 73, 1; 33-39
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identity Negotiation in the Arab Spring Discourse: the Egyptian Case
Autorzy:
Qabani, Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/2129787.pdf
Data publikacji:
2021-12-30
Wydawca:
Akademia Pedagogiki Specjalnej. Language and Society Research Committee
Tematy:
Arab Spring
Identity
Mubarak
Egypt
Tahrir Square
Discourse analysis
Power
Opis:
In both Eastern and Western traditions, political discourse and its relation to identity have been studied. The focus of this paper is the construction of identity and self-presentation strategies in the discourse of Mubarak of Egypt during the time known as “the Arab Spring”. This study aims to answer questions about how Mubarak constructs the various identities evident in his discourse, what kinds of resources are brought into effect, and how the multiple identities contribute to the aims of political discourse in general. While Mubarak recruited the considerable coercive power at his disposal, at the same time, he sought the power of discourse to construct and defend his legacy. Furthermore, he used the power of discourse to project his account of the external interference in domestic affairs and to recruit shared identities (based on nationalism).
Źródło:
Language, Discourse & Society; 2021, 9 (2); 63-80
2239-4192
Pojawia się w:
Language, Discourse & Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Fuzzy-Based Self-Adaptive Single Neuron PID Load Frequency Controller for Power System
Autorzy:
Eissa, M. Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/1193688.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
power system
load frequency
Intelligent Control
PID
Single Neuron
Opis:
This paper proposes a newly adaptive single-neuron proportional integral derivative (SNPID) controller that uses fuzzy logic as an adaptive system. The main problem of the classical controller is lacking the required robustness against disturbers, measurement noise in industrial applications. The new formula of the proposed controller helps in fixing this problem based on the fuzzy logic technique. In addition, the genetic algorithm (GA) is used to optimize parameters of the SNPID controller. Because of the high demands on the availability and efficiency of electrical power production, the design of robust load-frequency controller is becoming increasingly important due to its potential in increasing the reliability, maintainability and safety of power systems. So, the proposed controller has been applied for load-frequency control (LFC) of a single-area power system. The effectiveness of the proposed SNPID controller has been compared with the conventional controllers. The simulation results show that the proposed controller approach provides better damping of oscillations with a smaller settling time. This confirms its superiority against its counterparts. In addition, the results show the robustness of the proposed controller against the parametric variation of the system.
Źródło:
Power Electronics and Drives; 2019, 4, 39; 141-150
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Method to Calculate Power of International Actors
Autorzy:
Durmuş, Abdullah Metin
Powiązania:
https://bibliotekanauki.pl/articles/594891.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
International Relations Theory
Power Politics
Conflict Resolution
European Union
NATO
United Nations
Durmuş Scale of Power
Opis:
This article is based on the idea that it is necessary to develop a quantitative method to calculate power of international actors, which will enable scholars to analyse international conflicts. The Global Potential Power Distribution Chart, which is calculated based on three main characteristics of international actors, namely population, territory and economic power, shows “potential power of states and international organisations”. It may be called “Durmuş Scale of Power (DSoP)”. The chart is a comprehensive indicator with considerable accuracy and 100 % objectivity. In this article, potential powers of international actors have been calculated for years 1987, 2004 and 2015, which gives a clear overview of the potential power distribution (balance of power) of the World regarding states and as well as international organisations. Potential military powers of some states and international organisation in year 2015 have also been calculated. This research proves by means of a contemporary approach applied and a quantitative method developed that, the World is multipolar since 2004, and China is, potentially, the most powerful state of the World since 2015. The method introduced in this article were sufficient enough to explain the effects of the enlargement of NATO and EU, EU after BREXIT, reform of the Security Council of the United Nations and instrumental enough to provide a peaceful understanding for the self-determination issue of Kosova. There are three conclusions to this research: 1) The method “Durmuş Scale of Power” is calculated is reliable because everybody with a scientific calculator or a computer can easily calculate potential power of a state provided that he or she has reliable data for territory, population and GDP. 2) “Global Potential Power Distribution Chart” is a comprehensive Chart which shows “balance of power” at a specific year. It enables us to compare power of states and international organisations in different years. 3) It is convenient to use “Durmuş Scale of Power” while analysing issues of international relations.
Źródło:
Polish Political Science Yearbook; 2019, 1 (48); 11-35
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BORDERS VS. NUMBERS: ALBANIAN NATIONAL MINORITY IN THE SOUTH SERBIA BETWEEN NATION BUILDING IN KOSOVO AND EU MEMBER STATE BUILDING
Granice kontra liczby: między konsolidacją narodu w Kosowie a blokiem Państw Członkowskich Unii Europejskiej; sytuacja albańskiej mniejszości narodowej w południowej Serbii
Autorzy:
Gözübenli, Abdullah Sencer
Powiązania:
https://bibliotekanauki.pl/articles/439569.pdf
Data publikacji:
2019
Wydawca:
Akademia Finansów i Biznesu Vistula
Tematy:
land swap
border correction
Minority Rights
EU Conditionality
Western Balkans
zmiana gruntów
korekta granic
Prawa Mniejszości
warunki przytępienia do UE
Zachodnie Bałkany
Opis:
Serbia and Kosovo are the two countries that want to join the EU as their ultimate goal. However, in order for this process to start, Kosovo, still not recognised by five EU member states, should be recognised by many countries including Serbia and these two former enemies have to solve the problems seriously to become allies. While the independence of Kosovo remains unacceptable for Serbia, today one of the main problems facing the parties is the border issues. Despite the fact that Serbia insists there is no state border between Serbia and its former province, the EU-mediated talks on the normalisation of relations between Serbia and Kosovo, which include the option of a border correction namely, land swap is taking place behind closed doors. The land swap solution suggests that Kosovo takes control of the Albanian-inhabited Preševo Valley of South Serbia while the Serb-inhabited four northern municipalities of Kosovo would be associated with Serbia. But this controversial step, depending on whom you ask, is a historical matter that can lead to a war or a great compromise. This paper aims to take a comprehensive look at the solution of the land swap between Kosovo and Serbia on the side of Albanian minority in the South Serbia, considering that the balances in this region are very dynamic, and to examine the importance of the EU membership motivation for solving such disputes. The analysis in this study has been conducted based on (a) interviews with political decision-makers in the Preševo Valley involved in talks about swapping land and journalists from the region, (b) author’s observations and field research, (c) objectives and priorities identified in the Brussels Agreement in 2013, the Stabilisation and Association Agreement, and the instruments concerned with minority rights and the recognition of local autonomy (e.g. Framework Convention for the Protection of National Minorities and European Charter of Local Self-Government) compared to comments from the latest country-specific monitoring works by the EU and Council of Europe on the framework of the EU-facilitated Dialogue for the normalisation of relations between two countries.
Serbia i Kosowo to dwa kraje, których ostatecznym celem jest przyłączenie się do UE. Jednakże, aby proces ten mógł się rozpocząć, Kosowo, wciąż nieuznawane przez pięć państw członkowskich UE, powinno zostać uznane przez wiele krajów, wliczając w to Serbię, poza tym ci dwaj byli wrogowie muszą rozwiązać problemy w sposób poważny, by stać się sojusznikami. Skoro niepodległość Kosowa pozostaje nie do przyjęcia dla Serbii, dziś jednym z głównych problemów stojących przed stronami są kwestie graniczne. Pomimo faktu, że Serbia obstaje przy tym, iż nie istnieje żadna granica między Serbią a jej poprzednią prowincją, rozmowy prowadzone z mediacją UE w sprawie normalizacji stosunków między Serbią a Kosowem, obejmujące mianowicie opcję korekty granic, za zamkniętymi drzwiami ma miejsce wymiana terenów. Rozwiązanie polegające na wymianie terenów sugeruje, że Kosowo przejmuje kontrolę nad zamieszkałą przez Albańczyków z tzw. Doliny Preszewa w Południowej Serbii, podczas gdy zamieszkałe przez Serbów cztery północne gminy Kosowa połączyłyby się z Serbią. Lecz ten kontrowersyjny krok, w zależności od tego, kogo się pytamy, jest problemem historycznym, który może prowadzić do wojny albo do wielkiego kompromisu. Artykuł ma na celu wszechstronne spojrzenie na rozwiązanie, jakim jest wymiana terenów między Kosowem a Serbią, po stronie mniejszości albańskiej w Południowej Serbii, uwzględniając to, że równowagi w tym regionie są bardzo dynamiczne, oraz zbadanie znaczenia motywacji, jaką jest członkostwo w UE, dla rozstrzygania takich kwestii spornych. Analizę w tym opracowaniu przeprowadzono na podstawie: (a) wywiadów z decydentami politycznymi w Dolinie Preszewa, zaangażowanymi w rozmowy o wymianie terenów, i dziennikarzami z regionu, (b) obserwacji i badań terenowych autora, (c) celów i priorytetów określonych w Porozumieniu Brukselskim z roku 2013, Układzie o Stabilizacji i Stowarzyszeniu oraz instrumentów dotyczących praw mniejszości i uznania autonomii lokalnej (np. Ramowa Konwencja w sprawie Ochrony Mniejszości Narodowych oraz Europejska Karta Samorządów Lokalnych) w zestawieniu z komentarzami pochodzącymi z najnowszych prac monitoringowych odnoszących się do konkretnych krajów prowadzonych przez UE i Radę Europy dotyczących ram dialogu pod auspicjami UE w sprawie normalizacji stosunków między dwoma krajami.
Źródło:
Kwartalnik Naukowy Uczelni Vistula; 2019, 2(60); 81-100
2084-4689
Pojawia się w:
Kwartalnik Naukowy Uczelni Vistula
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a linear quadratic regulator based on genetic model reference adaptive control
Autorzy:
Abdullah, Abdullah I.
Mahmood, Ali.
Thanoon, Mohammad A.
Powiązania:
https://bibliotekanauki.pl/articles/27314263.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
model reference adaptive control
gradient approach
Linear Quadratic Regulator
genetic algorithm
Opis:
The conventional control system is a controller that controls or regulates the dynamics of any other process. From time to time, a conventional control system may not behave appropriately online; this is because of many factors like a variation in the dynamics of the process itself, unexpected changes in the environment, or even undefined parameters of the system model. To overcome this problem, we have designed and implemented an adaptive controller. This paper discusses the design of a controller for a ball and beam system with Genetic Model Reference Adaptive Control (GMRAC) for an adaptive mechanism with the MIT rule. Parameter adjustment (selection) should occur using optimization methods to obtain an optimal performance, so the genetic algorithm (GA) will be used as an optimization method to obtain the optimum values for these parameters. The Linear Quadratic Regulator (LQR) controller will be used as it is one of the most popular controllers. The performance of the proposed controller with the ball and beam system will be carried out with MATLAB Simulink in order to evaluate its effectiveness. The results show satisfactory performance where the position of the ball tracks the desired model reference.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 3; 75--81
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of heating on structure and leaching characteristics of a zinc carbonate ore
Autorzy:
Kumas, Cavit
Obut, Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/1446908.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
calcium zincate
smithsonite
sodium hydroxide leaching
zinc carbonate ore
zinc oxide
Opis:
In this work, the structural changes occurred in a zinc carbonate (smithsonite) ore sample following heating at temperatures between 523 K and 1173 K were investigated in detail using X-ray diffraction (XRD), thermal (TG/DTA) and Fourier-transform infrared (FT-IR) spectroscopy analyses. Afterwards, the leaching characteristics of zinc from the ore sample and the heated ore samples in sodium hydroxide solutions were determined. While heating at 523 K did not cause any structural change in the ore sample, heating at 723 K completely converted smithsonite $(ZnCO_3)$ in the ore sample to zinc oxide $(ZnO)$, which resulted lower zinc leaching efficiencies of 40.6% and 62.0% for 3 and 4 mol/dm3 NaOH concentrations, respectively, in comparison to zinc leaching efficiencies (67.2% and 70.7%) obtained for the unheated ore sample. On the other hand, due to neoformation of dissolution resistant $ZnFe_2O_4$, $Ca_2ZnSi2O_7$ and $Zn_2SiO_4$ phases during heating and formation of $CaZn_2(OH)_6∙2H_2O$ phase during leaching, the leaching efficiency of zinc further decreased to 22.2% and 31.3%, respectively, in 3 and 4 $mol$ / $dm^3$ NaOH solutions for the ore sample heated at 1173 K. The formation of zinc-containing dissolution resistant phases by high-temperature heating was observed to be the only reason for the reduction in the zinc leaching efficiency (49.4% at 1173 K) at the highest NaOH concentration (8 mol/dm3) studied. In this work, the comparative precipitation studies were also conducted and crystalline zinc oxides with different morphologies could be precipitated at considerably high efficiencies from the selected pregnant solutions obtained following leaching.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 5; 23-32
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Meta-Behavioural Skill: Students without Problem Behaviour vs. Students with Problem Behaviour
Autorzy:
Rahman, Saemah
Abdullah, Zakri
Powiązania:
https://bibliotekanauki.pl/articles/18104474.pdf
Data publikacji:
2013-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
metacognitive skills
meta-behavioural skills
self-regulation
students with problem behaviour
students without problem behaviour
Opis:
This study aimed to identify the levels of meta-behavioural skills among students from the categories of students without problem behaviour (SWOPB) and students with problem behaviour (SWPB). The sample of the study comprised 803 respondents, 398 students from the SWOPB category and 405 from the SWPB category. Meta-Behavioural Self-Evaluation questionnaire was used to measure meta-behavioural skills of the respondents. Research findings show that the meta-behavioural skills of students from the SWOPB category were better compared to SWPB. The findings also show that both groups lack conditional knowledge which is an important aspect of effective behaviour regulation, but the score for the SWPB group is very low (mean=1.55) as compared to the SWOPB group (mean =2.34). It can be hypothesized that conditional knowledge is one of the factors that should be promoted to help decrease problematic behaviour in schools.
Źródło:
The New Educational Review; 2013, 33; 97-107
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of non-equidistant baffle spacing in a small shell and tube heat exchanger
Autorzy:
Aziz, Abdullah
Rehman, Shafique
Powiązania:
https://bibliotekanauki.pl/articles/240423.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal distribution
baffle spacing
heat exchanger
turbulence modeling
CFD study
Opis:
Most of the formulations regarding the characteristics of a shell and tube heat exchanger have a common assumption; namely that the baffle plates are equidistant. This assumption fails to cater the real world scenario for defective baffles as the alteration in a shell and tube heat exchanger invalidates the equidistant baffle spacing of the plates. In this regard, a small six baffles heat exchanger was modeled in the computational fluid dynamics software package and studied by removing each baffle plate one at a time. Effect of removing each baffle plate on the temperature, pressure, heat transfer coefficient, and total heat transfer rate was recorded. It was observed that variation in the pressure drop for the same number of baffle plates varies along the axial order of the plates. The change in pressure drop due to the removal of the baffle plate near the inlet and the outlet was lowest and reaches a maximum in the axial center. It was also found that the plates below the radial center contribute higher towards the overall heat transfer as compared to those above.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 201-221
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model bounds for maximizing the minimum completion time problem
Autorzy:
Jemmali, Mahdi
Alourani, Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/2175499.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
numerical methods
optimization
mathematical model
lower bounds
metody numeryczne
optymalizacja
model matematyczny
dolna granica
Opis:
This paper focuses on the parallel machine scheduling problem related to maximizing the minimum completion time. This problem affects several industrial applications. The application of this problem in real life is very impressive. This paper is based on the development of new lower bounds for the exact solution of the studied problem. It is shown in the literature that the problem is strongly NP-hard. The first developed lower bound is obtained by utilizing the probabilistic method to generate several solutions for the lower bound. The second is based on the knapsack problem with the iterative method. These numerical methods give new, better lower bounds.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 4; 43--50
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of constraint conditions on the contact pressure distribution of multi-disc friction clutches
Wpływ warunków utwierdzenia na rozkład nacisków stykowych w wielotarczowych sprzęgłach ciernych
Autorzy:
Abdullah, O. I.
Schlattmann, J.
Powiązania:
https://bibliotekanauki.pl/articles/190361.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
dry friction
Multi-disc clutch
FEM
Contact analysis
tarcie suche
MES
analiza styku
Opis:
High thermal stresses generated between the contact surfaces in a clutch system, e.g., multi-disc friction clutch (back plate, clutch discs, separators, and piston), due to the friction heat generated during the slipping period are considered to be one of the main reasons for friction clutch failure. The finite element method has been used to study the contact pressure distribution of a multi-disc clutch (working in dry conditions) when all parts are closing together and the clutch system starts to engage. The augmented Lagrange algorithm is used to obtain the contact pressure distribution of the friction surfaces under different restriction conditions. Analysis has been completed using the developed axisymmetric model that is used to simulate the multi-disc clutch system.
Wysokie naprężenia cieplne generowane na powierzchniach styku w systemach sprzęgających, np. dla wielotarczowego sprzęgła ciernego (płyta dociskowa, tarcze sprzęgłowe, separatory, tłok), spowodowane generowaniem ciepła tarcia w wyniku poślizgu, zostało uznane za podstawową przyczynę uszkodzeń sprzęgieł ciernych. Do zbadania rozkładu nacisków w sprzęgle wielotarczowym pracującym w warunkach tarcia suchego – podczas gdy jego elementy zbliżają się do siebie i następuje włączenie systemu sprzęgłowego – zastosowano metodę elementu skończonego. Rozszerzony algorytm Lagrange'a został użyty w celu wyznaczenia rozkładu nacisków kontaktowych na powierzchniach tarcia dla różnych warunków utwierdzenia. Analiza została przeprowadzona z wykorzystaniem opracowanego modelu osiowosymetrycznego dla symulacji wielotarczowego systemu sprzęgłowego.
Źródło:
Tribologia; 2015, 6; 9-18
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 175

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