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Initiation and propagation of a crack in the orthopedic cement of a THR using XFEM
Gasmi, Bachir,Abderrahmene, Sahli,Smail, Benbarek,Benaoumeur, Aour Techno-Press 2019 Advances in computational design Vol.4 No.3
The sealing cement of total hip arthroplasty is the most widely used binder in orthopedic surgery for anchoring implants to their recipient bones. Nevertheless, this latter remains a fragile material with weak mechanical properties. Inside this material cracks initiate from cavities. These cracks propagate under the effect of fatigue and lead to the failure of this binder and consequently the loosening of the prosthesis. In this context, this work consists to predict the position of cracks initiation and their propagations path using the Extended Finite Element Method (XFEM). The results show that cracks can only be initiated from a sharp edges of an ellipsoidal cavity which the ratio of the minor axis over the major axis is equal to 0.1. A maximum crack length of 19 ?m found for a cavity situated in the proximal zone position under a static loading. All cracks propagate in same(almost) way regardless of the cavity(site of initiation) position and its inclination in the proximal zone.
Strategic Cross-Subsidies and Vertical Integration in Opening Telecommunications Markets
F. Gasmi,J. J. Laffont,W. W. Sharkey 서울대학교 경제연구소 2001 Seoul journal of economics Vol.14 No.3
This paper analyzes the strategic role of cross-subsidies under vertical integration. We consider an incumbent firm which operates in a regulated market (switched telecommunications service) and a competitive market (unswitched service). Fitting cost data generated with an engineering cost proxy model to smooth functional forms, we first assess the extent of cross-subsidies due to allocation of common costs and managerial effort. We then focus on the cost incentives of the regulatory scheme in the regulated segment and identify situations where the incumbent may blockade entry in the competitive segment.
Gene diversity shapes biological features of entomopathogenic Beauveria bassiana
Laila Gasmi,Sehyeon Baek,Jong Cheol Kim,Mi Rong Lee,Sihyeon Kim,So Eun Park,Dongwei Li,Tae Young Shin,Jae Su Kim 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Beauveria bassiana is widely studied for its potential as biopesticide. However, little is known about the factors to influence genetic diversity among isolates. In this work, we aimed to study the gene diversity of 42 isolates to figure out the impact of sequences variability on various biological features. The accumulated data showed no correlation between sequence variability and the fungal geographic localization. Meanwhile, weak to strong correlations have been obtained between the sequence diversity of various genes and the studied biological features. Interestingly, Biotrophy-associated gene 2 gene variability was correlated with all the studied biological features, being an important marker to determine isolates of interest for biological control. Therefore, the obtained data would serve as a database to focus on interesting genes related to improving or screening highly virulent isolates as biological control agents.
Hamza Gasmi,Sofiane Mendaci,Sami Laifa,Walid Kantas,Habib Benbouhenni 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.8
Modeling, control, and simulation of a wind energy conversion system equipped with a doubly fed induction generator are presented in this study. A fractional-order proportional-integral super twisting sliding mode controller (FOPI-STSMC) is used to ensure maximum power point tracking and control the stator active and reactive powers injected into the grid. A comparison of the simulation results provided by the FOPI-STSMC controller and conventional sliding mode controller is performed using MATLAB/Simulink software. The proposed FOPI-STSMC controller significantly reduced chattering while ensuring satisfactory robustness against parametric variations.
Boutheyna Gasmi,Mohamed Athmane Yallese,Septi Boucherit,Salim Chihaoui,Tarek Mabrouki 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.1
The purpose of this research is to assess the performance of CBN and ceramic tools during the dry turning of gray cast iron EN GJL-350. During the turning operation, the variable machining parameters are cutting speed, feed rate, depth of cut and type of the cutting material. This contribution consists of two sections, the first one deals with the performance evaluation of four materials in terms of evolution of flank wear, surface roughness (2D and 3D) and cutting forces. The focus of the second section is on statistical analysis, followed by modeling and optimization. The experiments are conducted according to the Taguchi design L32 and based on ANOVA approach to quantify the impact of input factors on the output parameters, namely, the surface roughness (Ra), the cutting force (Fz), the cutting power (Pc), specific cutting energy (Ecs). The RSM method was used to create prediction models of several technical factors (Ra, Fz, Pc, Ecs and MRR). Subsequently, the desirability function approach was used to achieve a multi-objective optimization that encompasses the output parameters simultaneously. The aim is to obtain optimal cutting regimes, following several cases of optimization often encountered in industry. The results found show that the CBN tool is the most efficient cutting material compared to the three ceramics. The optimal combination for the first case where the importance is the same for the different outputs is Vc=660 m/min, f=0.116 mm/rev, ap=0.232 mm and the material CBN. The optimization results have been verified by carrying out confirmation tests.
FREE-SURFACE PROFILE OF A JET FLOW IN U-SHAPED CHANNEL WITHOUT GRAVITY EFFECTS
ABDELKADER GASMI,ABDELKADER AMARA 장전수학회 2018 Advanced Studies in Contemporary Mathematics Vol.28 No.3
This paper concern with the two dimensional, steady jet flow problem of inviscid and incompressible fluid in semi infinite channel of the form U. This problem is solved by applying two methods. One is explicitly and analytically utilize the hodograph-transformation. The other is numerically using the series truncation method. The obtained results showed a good agreement between them and the comparison of these surface chapes is illustrated.
Laila Gasmi,Sehyeon Baek,Jong Cheol Kim,Mi Rong Lee,Jae Su Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
Beauveria comprises entomopathogenic fungi frequently isolated from insect cadavers, among which Beauveria bassiana is the most widely studied species of entomopathogenic fungal genus for its high potential as a biological pesticide. Even though it has been reported that B. bassiana is a heterogeneous assemblage of strains, little is known about the factors that might drive the genetic diversity among various isolates. In this work, we ought to study the gene diversity of 33 isolates in order to figure out the relationship between their gene diversity and biological features. First, we analyzed gene sequences that are involved in developmental and immunological processes of the fungal isolates and host. Now we are checking whether the gene diversity is related to the genes function, the isolates geographic localization, thermo-tolerance and virulence of the isolates. The obtained results so far showed no correlation between the genetic diversity and the fungal geographic localization. But interestingly, a positive correlation has been obtained between the virulence and the genetic diversity based on the internal transcribed spacers (ITS). Further analyses are aiming to confirm the obtained data and to analyze possible correlations between the genetic diversity and morphological and transcriptional data of the studied isolates. Based on the obtained results, we could much strongly focus on interesting genes which might be related to improving or screening highly virulent fungal agents as biological control agents.