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A. M. El‑Taher,A. F. Razzk 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
Preventing the formation of large platelets of Ag3Snintermetallic compounds (IMCs) during solidification of solder jointshas become a significant challenge in the design of Sn–Ag–Cu lead-free solder alloys. Large platelets of Ag3Snare generallyconsidered as undesirable as their presence can create solidification defects and causes mechanical property anisotropy. In the present work, the synergetic effects of adding 0.1 wt% of Fe, Co, Te and 2 wt% Bi to Sn–3.0Ag–0.7Cu (SAC 307)solder are studied in terms of the growth of large platelets Ag3SnIMCs and the resulting alloy’ creep resistance as well astheir thermal behavior. Although minor Fe, Co, Te and Bi alloying elements addition causes large increase in the degree ofundercooling from 3.4 to 22.3 °C with maintaining the pasty range and melting temperature at the same levels, the modifiedSAC307–FeTeCoBi alloy exhibits considerable increase in creep resistance (~ 10 times) and large fracture life-time thanSAC (307) solder at same stress levels and testing temperatures. This is attributed to the transition of Ag3SnIMCs from largeplatelets into fine needle-like morphology and formation of new (Cu,Co)6Sn5, FeSn2,SnTe IMCs and Bi particles, whichcould provide more obstacles for dislocation movement at the interphase boundaries.
Amel Benatallah,Faissal Ghozlane,Michel Marie 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.1
Objective: This study was conducted to evaluate the effect of water restriction (WR) on physiological and blood parameters in lactating dairy cows reared under Mediterranean climate. Methods: The trial lasted 16 days preceded by two weeks of adaptation to the experimental condition in spring 2014 on 6 dairy cows in mid-lactation. These cows were allowed water ad libitum for 4 days (W100) (hydration period), then split into 2 groups, one group has received 25% and the other 50% of water compared to their mean water consumption during the hydration period; then rehydrated for 4 days. Feed intake and physiological parameters: respiratory rate (RR), heart rate (HR), and rectal temperature (RT) were recorded twice a day. Blood was collected once a day and analyzed for serum concentration of glucose (Glc), triglycerides (TG), cholesterol (Chol), urea (Ur), creatinine (Crea), and total protein (TP) by enzymatic colorimetric method and cortisol (Cort) by radioimmunoassay. Results: Total dry matter intake (TDMI) was affected by WR. A decrease in TDMI was observed in WR groups compared to W100 group (effect, group, period, day, group×day, period× day: p<0.001). Also, WR resulted in a significant increase in RR, HR, RT in WR groups than in W100 group (effect, group: p<0.001). In addition, an increase in the serum concentration of Glc, TG, Chol, Ur, Crea, TP, and Cort was noted in WR groups (effect, group, period, day: p<0.001). Conclusion: This study has shown the ability of cows raised in a Mediterranean climate to cope with different levels of WR and thus reach a new equilibrium. As result, elucidates the important role of water as a limiting factor for livestock in environments with low water availability.
Amel Ramdane,Amar Betta,Farid Naceri,Sebti Belkacem 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.1
In this paper, we introduced a robust approach to induction motor control combining fuzzy logic and variable structure with a sliding mode control. Fuzzy tuning schemes are employed to improve control performance as well as to reduce chattering in the sliding mode. This combination ensures system high performance and fast dynamic response with no overshoot. Becoming a very robust, insensitive to process parameters variation and external disturbances.
From calix-dendrimers to fluorescent probes
Amel Ben Othman,Rym Abidi,Jong Seung Kim,Yang Kim,Jacques Vicens 고신대학교 자연과학연구소 2008 고신대학교 자연과학연구소 논문집 Vol.15 No.-
Supramolecular chemistry and nanotechnology are in close connection. The present paper is a timely review of some of our works dealing with the chemistry of dendrimers and subsequent related fluorescent probes.
Effect of nicotine on the structure of cochlea of guinea pigs
Amel M M Abdel Hafez,Sanaa A M Elgayar,Ola A Husain,Huda S A Thabet 대한해부학회 2014 Anatomy & Cell Biology Vol.47 No.3
Smoking has been positively associated with hearing loss in human. However, its effect on the cochlea has not been previously evaluated. Aim of work is to investigate the effect of nicotine, which is the primary pharmacological component of tobacco, on the structure of the cochlea of adult male guinea pigs. Fifteen male guinea pigs were classified into two groups: group I (control) and group II (nicotine treated group). Group II was further subdivided into two subgroups; IIA and IIB according to the dose of nicotine (3 mg/kg and 6 mg/kg, respectively). The cochlea was harvested and processed for light microscopy, transmission electron microscopy and scanning electron microscopy. Nicotine administration induced damage of outer hair cells which were distorted in shape with vacuolated cytoplasm and heterochromatic nuclei. Topography revealed damage of the stereocilia which included disorganization, bent and limp or complete loss and expansion of the surrounding supporting cells. These changes were more pronounced in the basal turn of the cochlea and mainly involved the outer hair cells. High dose induced more damage and resulted in protrusion of the apical poles of hair cells (blebing), particularly the outer two rows. Nicotine is proved to be harmful to the cells of the cochlea, particularly the outer hair cells of the basal turn. High doses induce blebing of hair cells.
Unsupervised Segmentation of Images Based on Shuffled Frog-Leaping Algorithm
( Amel Tehami ),( Hadria Fizazi ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.2
The image segmentation is the most important operation in an image processing system. It is located at the joint between the processing and analysis of the images. Unsupervised segmentation aims to automatically separate the image into natural clusters. However, because of its complexity several methods have been proposed, specifically methods of optimization. In our work we are interested to the technique SFLA (Shuffled Frog-Leaping Algorithm). It`s a memetic meta-heuristic algorithm that is based on frog populations in nature searching for food. This paper proposes a new approach of unsupervised image segmentation based on SFLA method. It is implemented and applied to different types of images. To validate the performances of our approach, we performed experiments which were compared to the method of K-means.
Lynda Amel Chaabane,Fouad Bourada,Mohamed Sekkal,Sara Zerouati,Fatima Zohra Zaoui,Abdeldjebbar Tounsi,Abdelhak Derras,Abdelmoumen Anis Bousahla,Abdelouahed Tounsi 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.71 No.2
In this investigation, study of the static and dynamic behaviors of functionally graded beams (FGB) is presented using ahyperbolic shear deformation theory (HySDT). The simply supported FG-beam is resting on the elastic foundation (Winkler-Pasternak types). The properties of the FG-beam vary according to exponential (E-FGB) and power-law (P-FGB) distributions. Thegoverning equations are determined via Hamilton’s principle and solved by using Navier’s method. To show the accuracy of thismodel (HySDT), the current results are compared with those available in the literature. Also, various numerical results are discussedto show the influence of the variation of the volume fraction of the materials, the power index, the slenderness ratio and the effect ofWinkler spring constant on the fundamental frequency, center deflection, normal and shear stress of FG-beam.
Louadj, Amel,Bouras, Omar,Rebahie, Ihssene,Cheknane, Omar,Zermane, Faiza Techno-Press 2021 Advances in environmental research Vol.10 No.2
Composite granules (named Fe-PILMG) based on both an Algerian montmorillonite with iron and gluten as an inert binder are prepared and used in the elimination of cadmium by dynamic adsorption in fixed bed columns. This study is essentially focused on the adsorption of Cd (II) in dynamic mode on a fixed bed based on Fe-PILMG sorbent granules followed by a study on the chemical regeneration of these new saturated adsorbents. The various regeneration tests are carried out with NaOH solution. The experimental data on the elimination of Cd (II) (pH = 7, T = 20 ± 2℃) in dynamic mode reveal that this adsorption is considerably influenced by the flow rate (2 to 5 mL min-1), Cd (II) initial concentration (20 to 50 mg L-1), and bed height (5 and 15 cm) and that a modification of each of these parameters can strongly influence the efficiency of this process. The assessment of the experimental data is carried out using the Thomas, Yoon & Nelson and Bohart-Adams models. The fit of the experimental and modeled breakthrough curves indicates excellent applicability of the mathematical models studied which is confirmed by high values of the correlation coefficient for the Bohart-Adams model (R<sup>2</sup> = 0.99, model constants N0 = 634.87 mg L-1, kBA = 0.079 (L (mg min)-1), from Yoon and Nelson model (R<sup>2</sup> = 0.97, ζ = 413.03 min, KYN = 0.0049 min-1), Thomas (R<sup>2</sup> = 0.98, q0 = 49.03 mg g-1, KTH = 5.21 mL (mg. min)-1).
Unsupervised Segmentation of Images Based on Shuffled Frog-Leaping Algorithm
Tehami, Amel,Fizazi, Hadria Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.2
The image segmentation is the most important operation in an image processing system. It is located at the joint between the processing and analysis of the images. Unsupervised segmentation aims to automatically separate the image into natural clusters. However, because of its complexity several methods have been proposed, specifically methods of optimization. In our work we are interested to the technique SFLA (Shuffled Frog-Leaping Algorithm). It's a memetic meta-heuristic algorithm that is based on frog populations in nature searching for food. This paper proposes a new approach of unsupervised image segmentation based on SFLA method. It is implemented and applied to different types of images. To validate the performances of our approach, we performed experiments which were compared to the method of K-means.
Cryptanalysis on a Scheme to Share Information via Employing a Discrete Algorithm to Quantum States
H. Amellal,A. Meslouhi,M. El Baz,Y. Hassouni,A. El Allati 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.5
Recently, Yang and Hwang [Int. J. Theor. Phys. 53, 224 (2014)] demonstrated that the scheme to share information via employing discrete algorithm to quantum states presented by Kang and Fang [Commun. Theor. Phys. 55, 239 (2011)] suffers from a major vulnerability allowing an eavesdropper to perform a measurement and resend attack. By introducing an additional checking state framework, the authors have proposed an improved protocol to overcome this weakness. This work calls into question the invoked vulnerability in order to clarify a misinterpretation in the same protocol stages also introduce a possible leakage information strategy, known as a faked state attack, despite the proposed improvement, which means that the same security problem may persist. Finally, an upgrading technic was introduced in order to enhance the security transmission.