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Assessment of whipping and springing on a large container vessel
Barhoumi, Mondher,Storhaug, Gaute The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.2
Wave induced vibrations increase the fatigue and extreme loading, but this is normally neglected in design. The industry view on this is changing. Wave induced vibrations are often divided into springing and whipping, and their relative contribution to fatigue and extreme loading varies depending on ship design. When it comes to displacement vessels, the contribution from whipping on fatigue and extreme loading is particularly high for certain container vessels. A large modern design container vessel with high bow flare angle and high service speed has been considered. The container vessel was equipped with a hull monitoring system from a recognized supplier of HMON systems. The vessel has been operating between Asia and Europe for a few years and valuable data has been collected. Also model tests have been carried out of this vessel to investigate fatigue and extreme loading, but model tests are often limited to head seas. For the full scale measurements, the correlation between stress data and wind data has been investigated. The wave and vibration damage are shown versus heading and Beaufort strength to indicate general trends. The wind data has also been compared to North Atlantic design environment. Even though it has been shown that the encountered wind data has been much less severe than in North Atlantic, the extreme loading defined by IACS URS11 is significantly exceeded when whipping is included. If whipping may contribute to collapse, then proper seamanship may be useful in order to limit the extreme loading. The vibration damage is also observed to be high from head to beam seas, and even present in stern seas, but fatigue damage in general is low on this East Asia to Europe trade.
Analysis of Toyota Prius 4th generation-based multi-mode system using dog clutches
Toumadher Barhoumi(바후미 투마더),Dongsuk Kum(금동석) 한국자동차공학회 2021 한국자동차공학회 지부 학술대회 논문집 Vol.2021 No.5
The Toyota Prius 4<SUP>th</SUP> generation has an excellent fuel economy (FE), but a mediocre acceleration performance (AP). In order to enhance its AP while maintaining its good FE, this paper investigates the addition of fixed gear modes to this benchmark system through using compact, efficient, and cost-effective dog clutches. First, a generic multi-mode system that considers all candidate clutch locations is generated. Then, the FE and AP are evaluated for all 98 candidate systems (i.e. different combinations of clutches). Few systems with a significantly enhanced AP and good FE were revealed, which confirms that adding fixed gear modes to the Prius 4th generation system does enhance its performance.
Assessment of whipping and springing on a large container vessel
Mondher Barhoumi,Gaute Storhaug 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.2
Wave induced vibrations increase the fatigue and extreme loading, but this is normally neglected in design. The industry view on this is changing. Wave induced vibrations are often divided into springing and whipping, and their relative contribution to fatigue and extreme loading varies depending on ship design. When it comes to dis-placement vessels, the contribution from whipping on fatigue and extreme loading is particularly high for certain container vessels. A large modern design container vessel with high bow flare angle and high service speed has been considered. The container vessel was equipped with a hull monitoring system from a recognized supplier of HMON systems. The vessel has been operating between Asia and Europe for a few years and valuable data has been collected. Also model tests have been carried out of this vessel to investigate fatigue and extreme loading, but model tests are often limited to head seas. For the full scale measurements, the correlation between stress data and wind data has been investigated. The wave and vibration damage are shown versus heading and Beaufort strength to indicate general trends. The wind data has also been compared to North Atlantic design environment. Even though it has been shown that the encountered wind data has been much less severe than in North Atlantic, the extreme loading defined by IACS URS11 is significantly exceeded when whipping is included. If whipping may contribute to collapse, then proper sea-manship may be useful in order to limit the extreme loading. The vibration damage is also observed to be high from head to beam seas, and even present in stern seas, but fatigue damage in general is low on this East Asia to Europe trade.
Kim, Wooki,Barhoumi, Rola,McMurray, David N,Chapkin, Robert S Cambridge University Press 2014 The British journal of nutrition Vol.111 No.2
<P>We have demonstrated previously that n-3 PUFA endogenously produced by fat-1 transgenic mice regulate CD4+ T-cell function by affecting the formation of lipid rafts, liquid-ordered mesodomains in the plasma membrane. In the present study, we tested the effects of dietary sources of n-3 PUFA, i.e. fish oil (FO) or purified DHA, when compared with an n-6 PUFA-enriched maize oil control diet in DO11.10 T-cell receptor transgenic mice. Dietary n-3 PUFA were enriched in CD4+ T-cells, resulting in the increase of the n-3:n-6 ratio. Following antigen-specific CD4+ T-cell activation by B-lymphoma cells pulsed with the ovalbumin 323-339 peptide, the formation of liquid-ordered mesodomains at the immunological synapse relative to the whole CD4+ T-cell, as assessed by Laurdan labelling, was increased (P<?005) in the FO-fed group. The FO diet also suppressed (P<?005) the co-localisation of PKCθ with ganglioside GM1 (monosialotetrahexosylganglioside), a marker for lipid rafts, which is consistent with previous observations. In contrast, the DHA diet down-regulated (P<?005) PKCθ signalling by moderately affecting the membrane liquid order at the immunological synapse, suggesting the potential contribution of the other major n-3 PUFA components of FO, including EPA.</P>
Accardi, Luigi,Barhoumi, Abdessatar,Dhahri, Ameur World Scientific Publishing Company 2017 INFINITE DIMENSIONAL ANALYSIS QUANTUM PROBABILITY Vol.20 No.1
<P>The identification mentioned in the title allows a formulation of the multidimensional Favard lemma different from the ones currently used in the literature and which parallels the original 1-dimensional formulation in the sense that the positive Jacobi sequence is replaced by a sequence of positive Hermitean (square) matrices and the real Jacobi sequence by a sequence of positive definite kernels. The above result opens the way to the program of a purely algebraic classification of probability measures on <TEX>$ \mathbb{R}^{d}$</TEX> with moments of any order and more generally of states on the polynomial algebra on <TEX>$ \mathbb{R}^{d}$</TEX>.</P><P>The quantum decomposition of classical real-valued random variables with all moments is one of the main ingredients in the proof.</P>
Abdallah Atia,Ahmed Debez,Zouhaier Barhoumi,Chedly Abdelly,Abderrazak Smaoui 한국식물학회 2009 Journal of Plant Biology Vol.52 No.5
Despite seeds and fruits of several halophytes being rich in essential oils and other bioactive substances, the histochemical characterization of these compounds has not received much attention. The aims of the present investigation were to localize the essential oils and the bioactive substances in the seed coat of the oilseed halophyte Crithmum maritimum L. Fruits were collected from the rocky coasts of Tabarka (NW of Tunisia, 36°57′ 12″ N, 08°45′18″ E). C. maritimum L. seed is shown to be surrounded by two envelopes: The first structure is a secretory envelope, consisting in about 20 canals. The second layer represents the endocarp. As revealed by fluorescence and light microscopy, the essential oils, O-dihydroxyphenols and flavonoids, known as bioactive compounds, were accumulated in the canals. The endocarp layer accumulated polysaccharides, O-dihydroxyphenols, and flavonoids. As a whole, these findings highlight the histochemical features and confirm the valuable quality of C. maritimum L. seeds.