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 : Boujelben, Abir (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
-
Ibrahimbegovic, Adnan,Boujelben, Abir Techno-Press 2018 Coupled systems mechanics Vol.7 No.2
In order to reduce the dependency on fossil fuels, a policy to increase the production capacity of wind turbine is set up. This can be achieved with increasing the dimensions of offshore wind turbine blades. However, this increase in size implies serious problems of stability and durability. Considering the cost of large turbines and financial consequences of their premature failure, it is imperative to carry out numerical simulations over long periods. Here, an energy-conserving time-stepping scheme is proposed in order to ensure the satisfying computation of long-term response. The proposed scheme is implemented for three-dimensional solid based on Biot strain measures, which is used for modeling flexible blades. The simulations are performed at full spatial scale. For reliable design process, the wind loads should be represented as realistically as possible, including the fluid-structure interaction (FSI) dynamic effects on wind turbine blades. However, full-scale 3D FSI simulations for long-term wind loading remain of prohibitive computation cost. Thus, the model to quantify the wind loads proposed here is a simple, but not too simple to be representative for preliminary design studies.
-
The Economic Growth–Inflation–Shadow Economy Trilogy: Developed Versus Developing Countries
Nedra Baklouti,Younes Boujelbene 한국국제경제학회 2019 International Economic Journal Vol.33 No.4
This study investigates the nexus among the economic growth– inflation–shadow economy trilogy by including the role of political stability for a sample of 33 developed and 14 developing countries over the 2005–2016 period. For the OECD countries, our results showed a bidirectional nexus among economic growth and the size of the shadow economy while the causality running from economic growth to inflation, on the one hand, and from inflation to the informal economy, on the other hand, is unidirectional. As for the MENA panel, the relationship between inflation and the underground economy remains bidirectional, while the relationship running from inflation to economic growth, on the one hand, and from the informal economy to economic growth, on the other hand, is unidirectional. With the introduction of political stability, the nexus among the informal economy and the inflation in the OECD countries becomes unidirectional running from inflation to the shadow economy. However, in the case of MENA countries, controlling for political stability reduces the magnitude of the coefficient of the shadow economy on inflation. We note that with a low level of political stability, countries facing the large size of the informal sector will shift their financing from taxes to seigniorage.
-
Trade-threshold Effect on Inflation in Tunisia: New Evidence Resulting from a Nonlinear Approach
Khoutem Ben Jedidia,Thouraya Boujelbene Dammak,Helali Kamel 한국국제경제학회 2019 International Economic Journal Vol.33 No.1
Trade openness is an important determinant of the inflation process. The effect of trade openness on inflation, however, is still an issue of debate at both theoretical and empirical levels. This study tried to provide a contribution to the literature by examining the relationship between inflation and trade openness in Tunisia over the period 1975Q1-2015Q4 using a nonlinear model. The originality of this study stems from the fact that it is the first investigation considering both the Residual-Based Tests for Cointegration in Models with the Regime Shifts and Threshold Regression model. The linear model confirms the existence of a positive relationship between inflation and trade in Tunisia. Yet, considering the nonlinear model, trade openness growth and Consumer Price Index (CPI) inflation growth show a statistically significant negative link as long as the trade openness evolution does not exceed the threshold. Nevertheless, if the trade openness growth is higher than the threshold, integrating the trade positively affects CPI inflation. Furthermore, a positive influence of Money supply growth on this type of inflation was noticed in Tunisia in all the considered regimes proving the effect of monetary factors on inflation level. Consequently, trade openness could be used to control inflation in Tunisia.
-
Magnetic phase coexistence in nanosized La0.5–xHoxCa0.5MnO3 manganites
Dhieb S.,Krichene A.,Chniba Boudjada N.,Boujelben W. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.3
In this paper, magnetic phase coexistence and stability of charge ordering in La0.5–xHoxCa0.5MnO3 (0 ≤ x ≤ 0.15) nanosized samples have been investigated. The particle size of all the samples is located between 47 and 62 nm. The studied samples show pertinent phenomena like Griffiths phase, training effect, exchange bias, charge ordering and magnetic phase separa- tion. At 5 K, the application of 10 T magnetic field generates more ferromagnetic domains in Ho-based samples, indicating that Ho substitution destabilizes the long-range charge ordering characterizing the parent compound La0.5Ca0.5MnO3.
-
Experimental study of the chip morphology in turning hardened AISI D2 steel
Mohamed Baccar Mhamdi,Sahbi Ben Salem,Mohamed Boujelbene,Emin Bayraktar 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.11
The study of local mechanisms of material removal is essential in all problems of shaping by machining. Indeed, the mastery of surfaces generated by cutting requires an understanding of cutting mechanisms. The turning of steels with high mechanical properties using the cutting tool, often called “hard turning,” is a new technique for the mechanical industry, and hence the need to understand the cutting mechanisms. The steel type EN X160CrMoV12 treated to 62 HRC (cold work tool steel: AISI D2 with a martensite matrix and distribution of primary and secondary carbides) is the subject of this study. Hard turning tests were carried out for this steel at different cutting conditions, with the aim to understand the mechanism of chip formation in order to be able to obtain the optimal cutting conditions. The chips obtained were examined under a microscope. The observation showed that the chip formation is influenced by cutting conditions. The chips contained a white layer, and this layer was examined under scanning electronic microscope (SEM) to study its variation depending on cutting parameters. The study shown, that cutting forces decrease with the increase of cutting speed. However, ANOVA method was used to establish the effect of the cutting conditions on experimental obtained results. Analysis of plastic deformation of the chip and the shear angle was made according to cutting conditions. Finally, a microhardness test was carried out to relate the mechanical properties and the microstructures of white layers.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
