106,673 research outputs found
"Sustaining Recovery--Medium-term Prospects and Policies for the U.S. Economy"
No full textThough recent market activity and housing reports give some warrant for optimism, United States economic growth was only 2.8 percent in the third quarter, and the unemployment rate is still very high. In their new Strategic Analysis, the Levy Institute's Macro-Modeling Team project that high unemployment will continue to be a problem if fiscal stimulus policies expire and deficit reduction efforts become the policy focus. The authors--President Dimitri B. Papadimitriou and Research Scholars Greg Hannsgen and Gennaro Zezza--argue that continued fiscal stimulus is necessary to reduce unemployment. The resulting federal deficits would be sustainable, they say, as long as they were accompanied by a coordinated and gradual devaluation of the dollar, especially against undervalued Asian currencies--a step necessary to prevent an increase in the current account deficit and ward off the risk of a currency crash.
Psychologie abstraite et psychologie concrète. En relisant G. Politzer. III (suite)
No full textVoutsinas Dimitri. Psychologie abstraite et psychologie concrète. En relisant G. Politzer. III (suite). In: Bulletin de psychologie, tome 22 n°273, 1968. pp. 239-250
Meynaud (Jean) - Les forces politiques en Grèce, par Jean Meynaud, avec le concours de P. Merlopoulos et G. Notaras
No full textKitsikis Dimitri. Meynaud (Jean) - Les forces politiques en Grèce, par Jean Meynaud, avec le concours de P. Merlopoulos et G. Notaras. In: Revue française de science politique, 15ᵉ année, n°2, 1965. pp. 333-334
Meynaud (Jean) - Les forces politiques en Grèce, par Jean Meynaud, avec le concours de P. Merlopoulos et G. Notaras
No full textKitsikis Dimitri. Meynaud (Jean) - Les forces politiques en Grèce, par Jean Meynaud, avec le concours de P. Merlopoulos et G. Notaras. In: Revue française de science politique, 15ᵉ année, n°2, 1965. pp. 333-334
J. Boutonier : Les dessins des enfants, éditions du Scarabée, Paris 1953, un volume in 16 jésus, 125 fr. Préface de G. Bachelard
No full textVoutsinas Dimitri. J. Boutonier : Les dessins des enfants, éditions du Scarabée, Paris 1953, un volume in 16 jésus, 125 fr. Préface de G. Bachelard. In: Bulletin de psychologie, tome 7 n°12, 1954. p. 765
Advanced Modeling for the Mixed-Mode Delamination of Composite Specimens
No full textIn recent years, many engineering components are made of high performance laminated composites and adhesively bonded interfaces. One of the most important damage modes of laminated structures is related to the non-linear and irreversible delamination process, including the formation and propagation of inter-laminar cracks, up to the complete detachment of the adherends. In this context, we address the interfacial delamination problem through an innovative cohesive formulation, named as Enhanced Beam Theory (EBT), where the specimen is considered as an assemblage of two composite sublaminates, partly bonded together by an elastic interface. This last one is represented by a continuous distribution of elastic springs acting along the normal and/or tangential direction, depending on the interfacial mixed-mode condition. This generalizes the idea suggested recently in [1] for a single mode-I delamination, and extended in [2] to include mixed loading, geometrical and mechanical conditions. The problem is here handled numerically through the generalized differential quadrature (GDQ) approach, to determine the delamination onset and propagation along weak interfaces of arbitrary shape, made of composite materials and subjected to mixed-mode conditions. The accuracy of the proposed formulation is verified against analytical predictions and theoretical formulations available in literature [3], [4].
References
[1] Dimitri, R., Cornetti, P., Mantič, V, Trullo, M. and De Lorenzis L. (2017) Mode-I debonding of a double cantilever beam: a comparison between cohesive crack modeling and Finite Fracture Mechanics, International Journal of Solids and Structures 124, 57–72.
[2] Dimitri, R., Tornabene, F. and Zavarise, G. (2018) Analytical and numerical modeling of the mixed-mode delamination process for composite moment-loaded double cantilever beams, Composite Structures 187, 535–553.
[3] Suo, Z. and Hutchinson J. W. (1990) Interface crack between two elastic layers. International Journal of Fracture 43(1), 1–18.
[4] Hutchinson, J. W. and Suo Z. (1992) Mixed mode cracking in layered materials. Advances in Applied Mechanics, 29, 63–191
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