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See detailComposite structures optimization using sequential convex programming
Bruyneel, Michaël ULg; Fleury, Claude ULg

in Advances in Engineering Software (2002), 33(7-10), 697-711

The design of composite structures is considered here. The approximation concepts approach is used to solve the optimization problem. The convex approximations of the MMA family are briefly described ... [more ▼]

The design of composite structures is considered here. The approximation concepts approach is used to solve the optimization problem. The convex approximations of the MMA family are briefly described. Several modifications of these approximations are presented. They are now based on gradient information at two successive iterations, avoiding the use of the expensive second-order derivatives. A two-point fitting scheme is also described, where the function value at the preceding design point is used to improve the approximation. Numerical examples compare these new purely non-monotonous schemes to the existing ones for the selection of optimal fibers orientations in laminates. It is shown how these two-point based approximations are well adapted to the problem and can improve the optimization task, leading to reasonable computational efforts. A procedure is also derived for considering simultaneously monotonous and non-monotonous structural behaviors. The resulting generalized approximation scheme is well suited for the optimization of composite structures when both plies thickness and fibers orientations are considered as design variables. It is concluded that the newly developed approximation schemes of the MMA family are reliable for composite structures optimization. All the studied approximations are convex and separable: the optimization problem can then be solved using a dual approach. (C) 2002 Civil-Comp Ltd and Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailComposition And Nutritive-Value For Rats Of Aspergillus-Niger Solid Fermented Barley
Mathot, Pierre; Debevere, Ch.; Walhain, Philippe et al

in Animal Feed Science & Technology (1992), 39(3-4), 227-237

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See detailComposition and orbits of language operations: finiteness and upper bounds
Charlier, Emilie ULg; Domaratzki, Michael; Harju, Tero et al

in International Journal of Computer Mathematics (2013), 90(6), 1171-1196

We consider a set of eight natural operations on formal languages (Kleene closure, positive closure, complement, prefix, suffix, factor, subword, and reversal), and compositions of them. If x and y are ... [more ▼]

We consider a set of eight natural operations on formal languages (Kleene closure, positive closure, complement, prefix, suffix, factor, subword, and reversal), and compositions of them. If x and y are compositions, we say x is equivalent to y if they have the same effect on all languages L. We prove that the number of equivalence classes of these eight operations is finite. This implies that the orbit of any language L under the elements of the monoid is finite and bounded, independently of L. This generalizes previous results about complement, Kleene closure, and positive closure. We also estimate the number of distinct languages generated by various subsets of these operations. [less ▲]

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See detailComposition And Physicochemical Extracted From Whole Seeds By Acid Properties Of Locust Bean Gum Or Water Dehulling Pre-Treatment
Dakia, Patrick; Blecker, Christophe ULg; Robert, Chiristelle et al

in Food Hydrocolloids (2008), 22(5),

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See detailComposition and Thickness Dependence of GeSn Growth by Chemical Vapor Deposition
Wang, Wei; Shimura, Yosuke; Nieddu, Thomas ULg et al

Conference (2013, June 04)

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See detailComposition chimique de l'endocarpe de Simarouba glauca D.C.
Lognay, Georges ULg; Ergo, A.; Wathelet, Jean-Paul ULg et al

in Revue Française des Corps Gras (1981), 4

Simarouba glauca D.C. Simaroubacées, plante arbustive à graines oléagineuses est fort intéressante pour les pays tropicaux non seulement à cause de sa grande résistance aux climats arides mais surtout ... [more ▼]

Simarouba glauca D.C. Simaroubacées, plante arbustive à graines oléagineuses est fort intéressante pour les pays tropicaux non seulement à cause de sa grande résistance aux climats arides mais surtout pour la source potentielle de matière grasse qu'elle représente. Dans un premier temps, les auteurs ont étudié l'amande de la graine de Simarouba. Dans cet artrcle, ils présentent pnncipalement une étude des lipides de I'endocarpe (coque) de cefte graine. lls déterminent la structure des triglycérides dont tes principaux sont du type : LnLL (11,88 %), OOO (9,87 %) LLL (5,63 %). StOP (7,23 %), LnLnL (6,77 %). OOP 16.47 %). [less ▲]

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See detailComposition chimique de la fumée de tabac
Angenot, Luc ULg

in Journal de Pharmacie de Belgique (1983), 38(3), 172-180

The tobacco plant has been the object of extensive basic research about its genetic, culture, biochemistry and postharvest metabolism. In addition , much is known of its pyrolysis products and the ... [more ▼]

The tobacco plant has been the object of extensive basic research about its genetic, culture, biochemistry and postharvest metabolism. In addition , much is known of its pyrolysis products and the conditions that affect the formation of these products. Tobacco smaoke is a concentrated aerosol of liquid particles suspended in an atmosphere consisting mainly of nitrogen, oxygen and CO2. While the precise chemical composition of the particular and gaseous phases is depended on the characteristics of commercial tobacco and the manner in which it is smoked, both phases contained tens of hundreds of individual constituents. Notable among potentially hazardous constituents of smoke are tar (mainly benzopyrene) nicotine, HCN, acrolein, N-nitrosamines, cadmium and polonium 210. recent advances in tobacco science make it possible to develop a safer tobacco that delivers undesirable smoke compounds at levels that are below the old values, but these results are biologically uninterpretable at present. [less ▲]

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See detailComposition chimique des graines de pin d'Alep (Pinus halepensis Mill.) d'origine tunisienne et caracterisation de la fraction lipidique.
Cheikh Rouhou, S.; Hentati, B.; Besbes, Souhail et al

Poster (2006, May)

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See detailComposition chimique du nététu, condiment alimentaire produit par fermentation des graines du caroubier africain Parkia biglobosa (Jacq.) Benth.
Ndir, Babacar; Lognay, Georges ULg; Wathelet, Bernard ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2000), 4(2), 101-105

The seed oils and cakes of netetu of different origins available on the Senegalian market have been studied to evaluate the nutritional potentialities of this important food condiment used in many African ... [more ▼]

The seed oils and cakes of netetu of different origins available on the Senegalian market have been studied to evaluate the nutritional potentialities of this important food condiment used in many African countries. The total oil content ranged from 141 to 349 g.kg-1. Careful gas chromatography and GC-MS (Gas Chromatography-Mass Spectrometry) investigations revealed seven major fatty acids among which linoleic (41.9–46.8% of the total fatty acids), oleic (12.6–14.6%), palmitic (10.2–11.3%), stearic (10.0–13.4%), and behenic (12.6–13.4%) predominate. Significant differences were observed between fermented and non-fermented seeds as well as between netetu of different origins. The tocopherol content was found very low (17.7 to 30.6 mg.100g-1 fat). The total amino acid patterns showed that beside high level of proteins (331 à 540 g.kg-1) and interesting levels of essential constituents, there is an important deficiency of tryptophane, cysteine, methionine and threonine. [less ▲]

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See detailComposition chimique et valeur alimentaire du pois protéagineux chez le porc en croissance.
Leterme, Pascal; Cors, François; Beckers, Yves ULg et al

in Revue de l’Agriculture = Landbouwtijdschrift (1989), 42(4), 683-693

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See detailComposition chimique et valeur nutritionnelle pour les ruminants d'un ensilage de mycélium d'Aspergillus niger.
Thewis, André ULg; Petit, Pascal

in Annales de Zootechnie (1994), 43(3), 242

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See detailComposition chimique et valeur nutritionnelle pour les ruminants des pulpes de chicorées.
Verheggen, Jannick; Thewis, André ULg; Moureaux, Jean-Marie et al

in Annales de Zootechnie (1994, March), 43(3), 243

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See detailComposition d'un fluide et tracé de l'isochore dans le système H2O-NaCl-CO2
Darimont, Anne ULg

in Annales de la Société Géologique de Belgique (1987), 110

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See detailComposition de la carcasse, qualité de viande et exploitation du Piétrain stress négatif
Youssao, A. K. L.; Verleyen, Vincent ULg; Michaux, Charles ULg et al

in Annales de Médecine Vétérinaire (2002), 146(6), 329-338

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See detailComposition de la graisse de Dacryodes edulis (G. Don) H.J. Lam.
Tchendji, C.; Séverin, M.; Deroanne, Claude ULg et al

in Revue Française des Corps Gras (1981), 4

Compte tenu de l'abondance du fruit de Dacryodes edulis (Safou) sur le marché indigène camerounas, nous avons cru interessant d'approfondir l'étude de son huile. Nous avons déterminé les proprétés ... [more ▼]

Compte tenu de l'abondance du fruit de Dacryodes edulis (Safou) sur le marché indigène camerounas, nous avons cru interessant d'approfondir l'étude de son huile. Nous avons déterminé les proprétés physiques, séparé les lpides en classes et déterntiné la structure complète des tryglycérides. Les principaux trlglycérides sont OOP (15,9 %), OLP (7,1 %), LOP 7 %). LLP (5,7 %), POP (24.9 %) et PLP (22 %) par minute. [less ▲]

Detailed reference viewed: 41 (6 ULg)