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Experimental Investigations for Thermal Mutual Evaluation in Multi-Chip Modules
Ayadi, Moez,Bouguezzi, Sihem,Ghariani, Moez,Neji, Rafik The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
The thermal behavior of power modules is an important criterion for the design of cooling systems and optimum thermal structure of these modules. An important consideration for high power and high frequency design is the spacing between semiconductor devices, substrate structure and influence of the boundary condition in the case. This study focuses on the thermal behavior of hybrid power modules to establish a simplified method that allows temperature estimation in different module components without decapsulation. This study resulted in a correction of the junction temperature values estimated from the transient thermal impedance of each component operating alone. The corrections depend on mutual thermal coupling between different chips of the hybrid structure. A new experimental technique for thermal mutual evaluation is presented. Notably, the classic analysis of thermal phenomena in these structures, which was independent of dissipated power magnitude and boundary conditions in the case, is incorrect.
Experimental Investigations for Thermal Mutual Evaluation in Multi-Chip Modules
Moez Ayadi,Sihem Bouguezzi,Moez Ghariani,Rafik Neji 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
The thermal behavior of power modules is an important criterion for the design of cooling systems and optimum thermal structure of these modules. An important consideration for high power and high frequency design is the spacing between semiconductor devices, substrate structure and influence of the boundary condition in the case. This study focuses on the thermal behavior of hybrid power modules to establish a simplified method that allows temperature estimation in different module components without decapsulation. This study resulted in a correction of the junction temperature values estimated from the transient thermal impedance of each component operating alone. The corrections depend on mutual thermal coupling between different chips of the hybrid structure. A new experimental technique for thermal mutual evaluation is presented. Notably, the classic analysis of thermal phenomena in these structures, which was independent of dissipated power magnitude and boundary conditions in the case, is incorrect.
Study of the Anisotropy of the Roller Compacted Concrete (RCC) for Pavement
Zdiri, Mustapha,Abriak, Nor-edine,Ouezdou, Mongi Ben,Neji, Jamel Korea Concrete Institute 2010 International Journal of Concrete Structures and M Vol.4 No.1
The roller compacted concrete (RCC) is supposed to be isotropic, whereas the compaction of this material, which is achieved using the same machines used for the soil, appears only unidirectional, making the RCC an anisotropic material. In this experimental work, the influence of the phenomenon of compaction on the isotropy of the RCC is studied. This study was carried out through an evaluation of the compressive strengths and ultrasonic tests which were used for measurements of the elastic modulus and the dynamic Poisson's ratio of the RCC as well as a qualitative judgement of the RCC aspect at the hardened state. The results of this work proved the anisotropy of the RCC and they showed the sensitivity of the mechanical strengths and the elastic modulus to the compaction direction.
Prediction and Measurement of the Bending Strength of the RCC
Zdiri, Mustapha,Ouezdou, Mongi Ben,Abriak, Nor-edine,Neji, Jamel Korea Concrete Institute 2009 International Journal of Concrete Structures and M Vol.3 No.1
The present work deals with the prediction, through models and experimental evaluation, of the bending strength of roller compacted concrete (RCC) for pavement applications. This concrete was manufactured using low cement proportioning (150 to $250\;kg/m^3$). The characterization of hardened RCC was carried out by experimental measurements of bending strengths. The predictions of these characteristics were achieved using empirical models. Comparison, of the values found in experiments with those empirically obtained, was made in order to choose and to propose the adapted and the most reliable models of prediction. The study showed that the bending strengths of the RCC mixture, experimentally found, can be also identified by models.
Prediction and Measurement of the Bending Strength of the RCC
Mustapha Zdiri,Mongi Ben Ouezdou,Nor-edine Abriak,Jamel Neji 한국콘크리트학회 2009 International Journal of Concrete Structures and M Vol.3 No.1
The present work deals with the prediction, through models and experimental evaluation, of the bending strength of roller compacted concrete (RCC) for pavement applications. This concrete was manufactured using low cement proportioning (150 to 250 kg/㎥). The characterization of hardened RCC was carried out by experimental measurements of bending strengths. The predictions of these characteristics were achieved using empirical models. Comparison, of the values found in experiments with those empirically obtained, was made in order to choose and to propose the adapted and the most reliable models of prediction. The study showed that the bending strengths of the RCC mixture, experimentally found, can be also identified by models.
Study of the Anisotropy of the Roller Compacted Concrete (RCC) for Pavement
Mustapha Zdiri,Nor-edine Abriak,Mongi Ben Ouezdou,Jamel Neji 한국콘크리트학회 2010 International Journal of Concrete Structures and M Vol.4 No.1
The roller compacted concrete (RCC) is supposed to be isotropic, whereas the compaction of this material, which is achieved using the same machines used for the soil, appears only unidirectional, making the RCC an anisotropic material. In this experimental work, the influence of the phenomenon of compaction on the isotropy of the RCC is studied. This study was carried out through an evaluation of the compressive strengths and ultrasonic tests which were used for measurements of the elastic modulus and the dynamic Poisson"s ratio of the RCC as well as a qualitative judgement of the RCC aspect at the hardened state. The results of this work proved the anisotropy of the RCC and they showed the sensitivity of the mechanical strengths and the elastic modulus to the compaction direction.
Felhi, Samir,Baccouch, Noura,Salah, Hichem Ben,Smaoui, Slim,Allouche, Noureddine,Gharsallah, Neji,Kadri, Adel 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.6
The present study revealed that the nutritive value of grape seeds (Vitis vinifera L.) was $383.55{\pm}0.13Kcal/100g$, with magnesium as the most abundant mineral element ($70.44{\pm}0.88 mg/L$). The maximum phenolic ($392.58{\pm}1.70mg\;of\;GAE/g$), flavonoid ($256.16{\pm}1.60mg\;of\;QE/g$), and tannin ($30.95{\pm}0.17mg\;of\;CE/g$) contents were also found in the ethanol, dichloromethane, and hexane extracts, respectively. The major phytochemical compounds in the ethyl acetate extract were identified via gas chromatography-mass spectrometry (GC-MS) analysis. The ethanol extract has the highest antioxidant activity ($IC_{50}=140{\pm}1.20{\mu}g/mL$ for DPPH, $145.28{\pm}0.45mg$ ${\alpha}-tocopherol/g$ for total antioxidant capacity, and $EC_{50}=80{\pm}1.41{\mu}g/mL$ for ferric-reducing power assays). For ${\beta}-carotene$ test, the highest antioxidant activity was obtained in the hexane extract. A satisfactory antimicrobial activity was found against a panel of microorganisms with the ethyl acetate extract as the best antimicrobial agent. Additionally, it was found that the bactericidal concentration required for the grape seed extract to kill Listeria monocytogenes should be less than 12.50 mg/mL (minimum inhibitory concentration=4).
Sana Bakari,Marwa Ncir,Samir Felhi,Hafedh Hajlaoui,Mongi Saoudi,Neji Gharsallah,Adel Kadri 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.6
Total phenolic and flavonoid contents and antioxidant properties of extracts and essential oils of the aerial parts of Teucrium polium growing in Tunisia were evaluated. Total phenolic and flavonoid contents of extracts ranged from 48.88±0.01 to 400.00±0.01 mg of GAE/g and from 2.75±0.01 to 38.85±0.04mg of QE/g, respectively. GC/MS analysis of essential oils led to identification of 71 compounds representing 89.66% of the total composition. Antioxidant activities were assessed using the DPPH. (1,1-diphenyl-2-picrylhydrazyl) radical scavenging activity, β-carotene bleaching, and reducing power. The best overall antioxidant activity was recorded for acetone extracts, with a strong positive correlation between the total phenolic content and the IC50 value of DPPH (R²=0.9999), attributed to the polyphenolic content.