http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Seghier, Djelloul (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
WEAK HERZ-TYPE HARDY SPACES WITH VARIABLE EXPONENTS AND APPLICATIONS
Souad Ben Seghier Korean Mathematical Society 2023 대한수학회지 Vol.60 No.1
Let α ∈ (0, ∞), p ∈ (0, ∞) and q(·) : ℝ<sup>n</sup> → [1, ∞) satisfy the globally log-Hölder continuity condition. We introduce the weak Herz-type Hardy spaces with variable exponents via the radial grand maximal operator and to give its maximal characterizations, we establish a version of the boundedness of the Hardy-Littlewood maximal operator M and the Fefferman-Stein vector-valued inequality on the weak Herz spaces with variable exponents. We also obtain the atomic and the molecular decompositions of the weak Herz-type Hardy spaces with variable exponents. As an application of the atomic decomposition we provide various equivalent characterizations of our spaces by means of the Lusin area function, the Littlewood-Paley g-function and the Littlewood-Paley $g^*_{\lambda}$-function.
-
Partial Discharge Activity Diagnosis in Electrical Cable Terminations Using Neural Networks
Abdelkader Elaggoune,Tahar Seghier,Boubakeur Zegnini,Belkheiri Mohammed 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
The electrical cable is an essential equipment in electricity transportation and distribution which are generally carried out using its types consisting in overhead lines or underground cables. The terminations are among the primordial accessories in electrical cable, they are intended to cover and protect the ends presenting the weak point of failure of an electrical cable because in these zones the electrical stress increases so much. Consequently, partial discharge activity will eventually occur and develop into arcing (Elaggoune et al. in Deuxième Conférence Internationale Sur La Maintenance, La Gestion, La Logistique Et L’électrotechnique, Enset D’oran, Algeria pp 1–5, 2012; Elaggoune in Localisation des sources potentielles des décharges parasites créées, par un dispositif expérimental de détection des Décharges Partielles dans un câble de l’énergie électrique.mémoire de magister, Université de Laghouat, Algérie, 2012; Goyal in Ind Eng Lett 4:15–20, 2014). Therefore, the terminations must be diagnosed periodically in order to avoid an insulation system breakdown, which causes a power outage and consequently excessive economic losses. The objective of this work is to assess the health of electrical cable terminations usingthedissolved gas analysis which is an eff ective chemical method toguarantee a detection of partial discharges in cable terminations (Samsudin et al. in Incipient fault detection in 33/11kV power transformers by using combined dissolved gas analysis technique and acoustic partial discharge measurement and validated through untanking, Modern Electric Power Systems (MEPS), Wroclaw, Poland, pp 1–6, 2010; Faisal et al. in Int J Electr Eng Inform 4: 186–201, 2012; Kumpulainen in Aspects and directions of internal arc protection, Doctoral Thesis, University Of Vaasa, Finland 2016; Vähämäki in Arc protection as integrated part of line protection relays, See http://www.cigaproject.ch/wp/docs/Arc% 20pro tection%20integrated%20in%20protection%20relays.pdf, 2020). However, this method failed to identify this phenomenon in some cases. To remedy with this problem, Radial Basic Functions neural network is applied as simulation tool. Therefore, the Radial Basic Functions neural network, based on dissolved gas analysis, can be used successfully in monitoring electrical cable terminations against partial discharges phenomenon.
-
Fatiha Babaghayou,Boubakeur Zegnini,Tahar Seghier 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.2
High-voltage (HV) power lines sometimes share the same path as buried pipelines that are protected by an insulation coatingand cathodic protection (CP). However, the neighboring HV power lines induce an alternating current (AC) that causescorrosion damage to metallic structures, which is known as the AC corrosion phenomenon. In this study, we conducted anexperimental investigation on a laboratory model to realize electrochemical tests on a pipeline steel sample. Afterward, weperformed numerical simulation studies of the electrochemical reactions involved in the corrosion, such as the anodic andcathodic processes, i.e., the iron oxidation and reduction of both oxygen and hydrogen. We also simulated the CP, AC corrosion,and deformation of the steel pipeline sample. Finally, to remedy the problem of AC corrosion damage, we developed amonitoring and correction program to optimize it. The main novelty of our work resides in our experimental and numericalsimulation results, which were in good agreement, along with the development of the program for the automatic mitigationof AC corrosion.
-
Park, Dae-Sung,Vasheghani Farahani, Sepehr K.,Walker, Marc,Mudd, James J.,Wang, Haiyuan,Krupski, Aleksander,Thorsteinsson, Einar B.,Seghier, Djelloul,Choi, Chel-Jong,Youn, Chang-Ju,McConville, Chris F American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.21
<P>We investigate the effect of thermally induced phase transformations on a metastable oxide alloy film, a multiphase Be<SUB><I>x</I></SUB>Zn<SUB>1–<I>x</I></SUB>O (BZO), grown on Al<SUB>2</SUB>O<SUB>3</SUB>(0001) substrate for annealing temperatures in the range of 600–950 °C. A pronounced structural transition is shown together with strain relaxation and atomic redistribution in the annealed films. Increasing annealing temperature initiates out-diffusion and segregation of Be and subsequent nucleation of nanoparticles at the surface, corresponding to a monotonic decrease in the lattice phonon energies and band gap energy of the films. Infrared reflectance simulations identify a highly conductive ZnO interface layer (thicknesses in the range of ≈10–29 nm for annealing temperatures ≥800 °C). The highly degenerate interface layers with temperature-independent carrier concentration and mobility significantly influence the electronic and optical properties of the BZO films. A parallel conduction model is employed to determine the carrier concentration and conductivity of the bulk and interface regions. The density-of-states-averaged effective mass of the conduction electrons for the interfaces is calculated to be in the range of 0.31<I>m</I><SUB>0</SUB> and 0.67<I>m</I><SUB>0</SUB>. A conductivity as high as 1.4 × 10<SUP>3</SUP> S·cm<SUP>–1</SUP> is attained, corresponding to the carrier concentration <I>n</I><SUB>Int</SUB> = 2.16 × 10<SUP>20</SUP> cm<SUP>–3</SUP> at the interface layers, and comparable to the highest conductivities achieved in highly doped ZnO. The origin of such a nanoscale degenerate interface layer is attributed to the counter-diffusion of Be and Zn, rendering a high accumulation of Zn interstitials and a giant reduction of charge-compensating defects. These observations provide a broad understanding of the thermodynamics and phase transformations in Be<SUB><I>x</I></SUB>Zn<SUB>1–<I>x</I></SUB>O alloys for the application of highly conductive and transparent oxide-based devices and fabrication of their alloy nanostructures.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-21/am5043388/production/images/medium/am-2014-043388_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5043388'>ACS Electronic Supporting Info</A></P>
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
