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En littérature francophone, la science-fiction est typiquement associée aux productions française, belge ou québécoise. Rares sont les textes – et les analyses – qui situent le genre dans un contexte africain et caribéen. Michael Janis note à ce sujet que les auteurs africains ont longtemps choisi de recourir au réalisme en réaction aux écrits européens exotisants, idéalisants et colonialistes sur l’Afrique. Mark Dery, auteur de « Black to the Future », se demande, quant à lui, si l’invention de futurs sciencefictionnels constitue une priorité pour des communautés qui ont vécu l’oppression, la marginalisation, la discrimination et l’effacement de leurs histoires, étant donné qu’il est difficile de se projeter dans l’avenir sans croire à la possibilité de pouvoir le façonner soi-même. Un des premiers textes sciencefictionnels africains explorant la rencontre entre l’humanité et des extra-terrestres est la nouvelle « Jazz et vin de palme » (1981) de l’écrivain congolais Emmanuel Dongala. Il convient également de mentionner les romans plus récents d’Abdourahman A. Waberi Aux États-Unis d’Afrique (2006) et 2084 de Boualem Sansal (2015) ainsi que les films Les Saignantes (2005) et Naked Reality (2016) du réalisateur camerounais Jean-Pierre Bekolo ou encore Africa Paradis (2006) du réalisateur béninois Sylvestre Amoussou. Une recherche au sujet des oeuvres antillaises participant de la science-fiction, sensu stricto, dévoile qu’elles sont encore à écrire. Ceci dit, l’auteur d’origine guadeloupéenne John Renmann et sa série Les Colonnes du temps (2015) ont commencé à défricher le terrain. Force est de constater que le genre connaît une plus grande popularité dans l’aire anglophone grâce à des auteurs comme Nnedi Okorafor, Dilman Dila, Lauren Beukes, Nalo Hopkinson, Tobias S. Buckell et Karen Lord.

De fait, afin de répondre å de tels travestissements, il est nécessaire, selon lauteur Caddo de Native Americans in Comic Books Michael A. Sheyashe, en entrevue avec Elizabeth LaPensée, que « les auteurs autochtones simpliquent davantage de maniere créative dans ces différents aspects de la culture populaire » (LaPensée). What are students learning-or not learning-about Aboriginal peoples in the public school system that either blinds them to the racism of these acts or leads them to disregard the racism entirely? The purpose of The 500 Years of Resistance Comic Book is to raise the levels of historical understanding and warrior spirit among Indigenous peoples and others » 6 Étudiant « modele » dont la photo fut publicisée en 1897 par l'École industrielle de Regina dans le but de maximiser l'inscription détudiants (Where Are the Children 23-24). 15 « significant because they can be used by historians, teachers, and activists as accessible methods in which to confront Canada's horrific history of colonialism and to create decolonizing dialogue between Indigenous and non-Indigenous peoples about how to establish more positive relations in the present and future » OUVRAGES CITES Akiwenzie-Damm, Kateri.

Funeral services and interment for [Gregory J. Hopkinson], 19, will be private. Born Dec. 14, 1982, in Hoffman Estates, he died Saturday, Jan. 19, 2002, in Glendale Heights.

Margaret J. Hopkinson Mass for Margaret J. Hopkinson, 47, will be held at 10 a.m. Monday, at St. James Church, 841 N. Arlington Heights Road, Arlington Heights. Born July 6, 1958, in Chicago, she died Saturday, April 22, 2006.

For the implementation of simulations for large plastic deformation processes such as cutting and impact, the development of the constitutive models for describing accurately the dynamic plasticity and damage behaviors of materials plays a crucial role in the improvement of simulation accuracy. This paper focuses on the dynamic behaviors of 45CrNiMoVA ultra-high-strength torsion bar steel. According to investigation of the Split-Hopkinson pressure bar (SHPB) and Split-Hopkinson tensile bar (SHTB) tests at different strain rate and different temperatures, 45CrNiMoVA ultra-high-strength steel is characterized by strain hardening, strain-rate hardening and thermal softening effects. Based on the analysis on the mechanism of the experimental results and the limitation of classic Johnson-Cook (J-C) constitutive model, a modified J-C model by considering the phase transition at high temperature is established. The multi-objective optimization fitting method was used for fitting model parameters. Compared with the classic J-C constitutive model, the fitting accuracy of the modified J-C model significantly improved. In addition, finite element simulations for SHPB and SHTB based on the modified J-C model are conducted. The SHPB stress-strain curves and the fracture morphology of SHTB samples from simulations are in good agreement with those from tests.

Dynamic compression experiments of GH4169 alloy at deformation temperatures of 293–873 K and strain rates of 1000–6000 s −1 were performed based on the split Hopkinson pressure bar (SHPB) experimental platform to analyze its thermal deformation behavior and constitutive models. The experimental results show that the hot deformation behavior of GH4169 alloy is mainly limited by the combined action of temperature softening and strain hardening, and the true stress decreases with the increase in the deformation temperature or the decrease in the strain rate. Based on the experimental data, an improved artificial neural network (IANN) model and the classical Johnson–Cook (J–C) constitutive model were constructed to describe the deformation behavior of the studied GH4169 alloy, and the mean absolute error (MAE) was used to evaluate the accuracy of the two models. Based on the comparison of the experimental and predicted results, at strain rates of 1000–3000 s −1 , the MAE of the IANN model was 5, which was only 1/20 that of the J–C model, thereby exhibiting perfect accuracy. At strain rates of 4000–6000 s −1 , the MAE of the IANN model was increased to 82 and the accuracy was decreased, but the MAE was still only 1/4 that of the J–C model. Additionally, the IANN method was embedded in a visual operation interface for the construction of constitutive models with high precision and efficiency, and could be extended to constitutive models of other alloy materials.

Based on the split Hopkinson tensile bar (SHTP) test method, the fracture behavior of the 2A12-T4 aluminum alloy compact tensile (CT) specimens has been investigated using experimental-simulation combination method in this paper. Upon validating the numerical approach by comparing with experimental results, the influence of specimen thickness has been analyzed. It is found that the J -integral curves are increasing exponentially with time, and specimens of different thickness have similar variation laws. With the increase of thickness, the dominant factor changes from plane stress area to plane strain area, and the J -integral value first increases and then decreases to a constant value at last. The percentage of plane strain area in the total thickness has been derived.

In this paper, the effects of temperature and strain rate on the plastic deformation behavior of 5052 aluminum alloy were investigated by quasi-static tensile test and split Hopkinson pressure bar (SHPB) experiments. Meanwhile, the stress-strain relations obtained through these experiments were employed for calibrating Johnson-Cook (J-C) plastic flow constitutive parameters of 5052 aluminum alloy. The results show that the strain rate sensitivity of 5052 aluminum alloy is insignificant in the range of 0.001s-1~3000s-1, while temperature has a great effect on the material plastic behavior. The experimental data are basically consistent with the predicted outcome of J-C constitutive model.