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    Wyświetlanie 1-5 z 5
    Tytuł:
    Generalized derivations in prime rings and Banach algebras
    Autorzy:
    Ali, Asma
    Dhara, Basudeb
    Khan, Shahoor
    Powiązania:
    https://bibliotekanauki.pl/articles/729205.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    prime ring
    generalized derivation
    extended centroid
    Utumi quotient ring
    Opis:
    Let R be a prime ring with extended centroid C, F a generalized derivation of R and n ≥ 1, m≥ 1 fixed integers. In this paper we study the situations:
    1. $(F(x∘y))^m = (x∘y)ⁿ$ for all x,y ∈ I, where I is a nonzero ideal of R;
    2. (F(x∘y))ⁿ=(x∘y)ⁿ for all x,y ∈ I, where I is a nonzero right ideal of R.
    Moreover, we also investigate the situation in semiprime rings and Banach algebras.
    Źródło:
    Discussiones Mathematicae - General Algebra and Applications; 2014, 34, 1; 125-138
    1509-9415
    Pojawia się w:
    Discussiones Mathematicae - General Algebra and Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early detection and localization of stator inter-turn short circuit faults based on variational mode decomposition and deep learning in induction motor
    Autorzy:
    Guedidi, Asma
    Laala, Widad
    Guettaf, Abderrazak
    Arif, Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/27313828.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    convolutional neural networks
    CNNs
    deep learning
    short circuit fault diagnosis
    variational mode decomposition
    information map
    silnik indukcyjny
    konwolucyjne sieci neuronowe
    uczenie głębokie
    mapa informacyjna
    Opis:
    The existing diagnostic techniques for detecting inter-turn short circuits (ITSCs) in induction motors face two primary challenges. Firstly, they suffer from reduced sensitivity, often failing to detect ITSCs when only a few turns are short-circuited. Secondly, their reliability are compromised by load fluctuations, leading to false alarms even in the absence of actual faults. To address these issues, a novel intelligent approach to diagnose ITSC fault is proposed. Indeed, this method encompasses three core components: a novel multi-sensor fusion technique, a knowledge map, and enhanced Convolutional Neural Networks (CNNs). First, the raw data collected from multiple sensors undergoes a transformation into 2D data using a novel image transformation based on Hilbert transform (HT) and variational mode decomposition (VMD), which is concatenate to a novel information map including frequency fault information and rotational speed. Then, this 3D multi information image is used as input to an improvement CNN model that apply a transfer learning for an enhanced version of SqueezNet with incorporating a novel attention mechanism module to precisely identify fault features. Experimental results and performance comparisons demonstrate that the proposed model attains high performance surpassing other Deep Learning (DL) methods in terms of accuracy. In addition, the model has consistently demonstrated its ability to make precise predictions and accurately classify fault severity, even under different working conditions.
    Źródło:
    Diagnostyka; 2023, 24, 4; art. no. 2023401
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Firefly algorithm optimization of manipulator robotic control based on fast terminal sliding mode
    Autorzy:
    Mallem, Ali
    Douak, Fouzi
    Benaziza, Walid
    Bounouara, Asma
    Powiązania:
    https://bibliotekanauki.pl/articles/27314236.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    manipulator robotic
    fast terminal sliding mode
    firefly algorithm
    Lyapunov stability
    Opis:
    In this paper a new algorithm of optimization in the field of manipulator robotic control is presented. The proposed control approach is based on fast terminal sliding mode control (FTSMC), in order to guarantee the convergence of the position articulations errors to zero in finite time without chattering phenomena, and the Firefly algorithm in order to generate the optimal parameters that ensure minimum reaching time and mean square error and achieve better performances. This ensures the asymptotic stability of the system using a Lyapunov candidate in the presence of disturbances. The simulations are applied on a two-link robotic manipulator with different tracking references by using Matlab/ Simulink. Results show the efficiency and confirm the robustness of the proposed control strategy.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 4; 44--52
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power System Transient Stability Case Study: A Power Sub-Station Plant in Sudan
    Autorzy:
    Abbas, Asma
    Kamal, Ramadan Doud
    Elmustafa, Sayed Ali Ahmed
    Powiązania:
    https://bibliotekanauki.pl/articles/1193487.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dynamic Stability
    GARRI power stations
    Swing Equation
    Transient Stability
    power angle
    synchronism
    Opis:
    Power system stability is defined by the tendency of the energy system to develop recovery forces equal or greater than the disturbing forces to maintain a stable equilibrium state. In general, power system stability problems are usually divided into two parts, steady state and transient state. An extension of steady-state stability is dynamic stability. Transient stability deals with the effects of large disturbances such as malfunctions, sudden line interruptions, and sudden application or load removal. This research is presents load angle method to transient stability problem for multi-machine system. The ETAP program is used to simulate the above method to study transient stability. A sub-station plant in Khartoum (GARRI) with four generation sections (1, 2 and 4) has been taken as a case study. The simulation result shows that when a single line-ground fault occurs at main busbar and cleared at time t = 0.4 sec the system is stable, in case 2, when the same fault cleared at t = 3 sec the system become unstable.
    Źródło:
    World Scientific News; 2021, 158; 267-284
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE EFFECT OF A SINGLE OR MULTIPLE DOSES OF GRAPEFRUIT JUICE ON SOME PHARMACOKINETIC AND PHARMACODYNAMIC EFFECTS OF PARACETAMOL IN MICE
    Autorzy:
    AL ZA'ABI, MOHAMMED
    ALI, BADRELDIN H.
    AL-HDHRAMI, ASMA
    Powiązania:
    https://bibliotekanauki.pl/articles/895589.pdf
    Data publikacji:
    2019-08-30
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    mice
    paracetamol
    pharmacokinetic
    grapefruit juice
    pharmacodynamic
    Opis:
    Grapefruit juice (GFJ), a commonly consumed dietary substance, has been shown to alter the disposition of several commonly used drugs. The available data on the effects of GFJ on the paracetamol pharmacokinetics and pharmacodynamics are at variance. The aim of this study was to evaluate the effect of a single or multiple dose of GFJ on some pharmacokinetics and pharmacodynamics aspects of orally given paracetamol (400 mg/Kg). Male mice were randomly divided into three equal groups: mice in the first group were given paracetamol; the second group was given a single oral dose (10 mL/Kg) of GFJ one hour prior to paracetamol administration; the third group was administered multiple oral doses of GFJ (10 mL/Kg) for five consecutive days, and on the last day it was treated with paracetamol. Blood samples were collected 10, 20, 30, and 40 min, and 1, 2, 4, 6 and 8 h after paracetamol administration for subsequent pharmacokinetic analysis. Some mice in the same three groups were also tested for their reactions to thermal (hotplate) and chemical (acetic acid induced – abdominal constriction) nociceptive stimuli. GFJ increased the plasma concentration and area under the plasma concentration curve of paracetamol, to a greater extent after a single dose than multiple doses. It also increased the reaction time in the hotplate test, and reduced abdominal constrictions. GFJ administration increased the plasma concentration and the analgesic effect of paracetamol in mice. The possible implications of these changes in humans and their clinical relevance need to be further investigated.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 4; 753-759
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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