1,851 research outputs found
Voyage Illustre dans Les Cinq Parties Du Monde par Adolphe Joanne
No full textFrontispiece depicting images from the travel book, "Voyage Illustre dans Les Cinq Parties Du Monde" by Adolphe Laurent Joanne. At center in front of a large globe, a woman wearing a laurel wreath on her head is seated writing in a book. Various people and animals from around the world are gathered behind her. Books, instruments and weapons lie in front of her, and famous buildings and landscapes are shown in the background. A balloon flies overhead.For more information about this item, visit https://archivesspace.mit.edu/repositories/2/digital_objects/79
Fashion and Physique Symposium:Dr. Joanne Entwistle “New Models of Diversity”
No full textDr. Joanne Entwistle presenting “New Models of Diversity” at The Museum at FIT's 19th fashion symposium, Fashion and Physique, held on Friday, February 23, 2018.The one-day symposium featured lectures and panels on topics such as the emergence of the plus-size fashion industry in the early twentieth century, the impact of popular culture on how we assess the female body, and fashion accessibility for the disabled in the technological age.Dr. Joanne Entwistle is a reader in culture, media and creative industries at King’s College, London. She is author of "The Fashioned Body: Fashion, Dress and Modern Social Theory.
Enhancing ductility and strength of nanostructured Mg alloy by in-situ powder casting during spark plasma sintering
Full text linkDue to internal processing defects, bulk nanostructured Mg alloys have high strength but extremely poor ductility. A novel and facile process was designed and in-situ powder casting was initiated during spark plasma sintering. This process significantly reduced processing induced defects, enhanced inter-particle bonding and introduced significant precipitation without extra ageing treatment, leading to improvement of the compressive strength and ductility. The compressive strain of bulk sample consisting of pure cryomilled powder was 3.6% with an ultimate strength of 500 MPa, while cryomilled powder mixed with eutectic Mg-Zn alloy powder obtained a compressive strain of 6.6% and ultimate strength of 506 MPa. The ductility of the sample with mixed powder was increased by 83% without any sacrifice of strength compared to the sample consisting of only pure cryomilled powder
Creating postcolonial subjectivity: Subaltern geopolitics, knowledge and citizenship in Tanzania
No full textInterviews with Tanzanians and ex-pats who were at the University of Dar es Salaam and related institutions in post-colonial Tanzania.
In this programme of study Dr Joanne Sharp will examine the rise of Tanzanian political and cultural citizenship from the immediate postcolonial vision of Julius Nyerere through to Tanzanian interpretations of the current "war on terror".
Dr Sharp will situate critical geopolitics in a country where fear and threat do not (just) find expression in geographies of political terrorism, but faces perhaps more immediate danger in neo-colonial international geographies of trade and aid, threats from disease epidemics and poverty, and from the uncertainties of increasing regional dominance by China.
Dr Sharp will examine political speeches and other archival documents, the transmission and debating of these concepts in the media, and the actual experience of living in Tanzania from the heyday of postcolonial African socialism through periods of uncertainty with the imposition of IMF-led restructuring in the 1980s, the end of the Cold War and then the current articulation of geopolitics in current concerns over global terror networks. At a time dominated by US vision and power, this programme seeks how to present a different interpretation and experience of global events and political identity, and thus a different vision of how the world might be organised
A subaltern critical geopolitics of the war on terror: postcolonial security in Tanzania
Full text linkCurrently, hegemonic geographical imaginations are dominated by the affective geopolitics of the War on Terror, and related security practice is universalised into what has been called ‘‘globalized fear’’ (Pain, 2009). Critical approaches to geopolitics have been attentive to the Westerncentric nature of this imaginary, however, studies of non-Western perceptions of current geopolitics and the nature of fear will help to further displace dominant geopolitical imaginations. Africa, for example, is a continent that is often captured in Western geopolitics – as a site of failed states, the coming anarchy, passive recipient of aid, and so on – but geopolitical representations originating in Africa rarely make much of an impact on political theory.
This paper aims to add to critical work on the so-called War on Terror from a perspective emerging from the margins of the dominant geopolitical imagination. It considers the geopolitical imagination of the War on Terror from a non-Western source, newspapers in Tanzania
The global knowledge economy in question
Full text linkPurpose – The aim of this paper is to bring into question the idea of the global knowledge economy. Design/methodology/approach – The paper explores the characteristics of the knowledge economy, as elaborated by academics and policy makers concerned with knowledge in the contemporary global business environment. A range of available data is reviewed concerning the global distribution of investments in knowledge, information and communications technologies (ICTs), international transactions in knowledge-intensive services and royalty and licensing fees, employment by sector and literacy rates. Such data provide a basis for an initial critical evaluation of the notion of the global knowledge economy.
Findings – The use of the term “global knowledge economy” fails to acknowledge the uneven distribution of knowledge-based economic activity. Moreover, as currently constituted, the idea of a global knowledge economy, which focuses on knowledge as conceptualised in the commercial activities of advanced countries, overlooks the diversity of knowledges present in the world today.
Originality/value – This paper provides the first attempt to question and critically explore the global knowledge economy
Direct observation of precipitation along twin boundaries and dissolution in a magnesium alloy annealing at high temperature
Full text linkPrecipitation along twin boundaries and dissolution in a cold-rolled Mg-Y-Nd alloy was directly observed for the first time during annealing at 490 °C. Precipitation occurred concurrently with recrystallization and the combined effect of precipitation and solute segregated to twin boundaries modified the recrystallization behaviour. Precipitates later dissolved into the matrix at the point where full recrystallization was nearly complete. The precipitates and higher solute concentration along original twin boundaries hindered grain growth of newly formed recrystallized grains. Even where twin boundaries had been consumed by recrystallization, the size of recrystallized grains were still controlled by the pre-existing twin boundaries
New compositional design for creating tough metallic glass composites with excellent work hardening
No full textThe extrinsic size of both crystalline alloys and amorphous metallic alloys strongly affects their mechanical properties at the submicron scale or nanometre scale. For example, Zr-based metallic glass nanopillars exhibit ceramic-like strengths (2.25 GPa) and metal-like ductility (25%) simultaneously when the pillar dimension is reduced to <100 nm. Here, we report a new compositional design approach to create tough metallic glass composites consisting of micrometre-scale dendrites and nanometre-scale amorphous matrices that exhibit high strength and ductility in the normally brittle MgZnCa metallic glass system. When the thickness of the amorphous matrix is reduced to the nanometre scale, a low density (ρ ≈ 1.99 g cm−3) Mg91.5Zn7.5Ca1 alloy exhibits room temperature tensile ductility exceeding 15.6%, a yield strength of 215 MPa and a fracture strength of 478 MPa. Transmission electron microscopy analysis demonstrates that the alloy consists of micrometre-scale α-Mg solid solution dendrites and nanometre-scale amorphous matrix (80–530 nm in thickness). The homogeneous deformation of nanometre scale amorphous matrices is believed to be responsible for the high toughness and excellent work-hardening behaviour
On the use of cryomilling and spark plasma sintering to achieve high strength in a magnesium alloy
Full text linkBulk nanostructured magnesium alloy AZ31 has been produced by spark plasma sintering at four different temperatures from 350 to 450 °C. The effect of sintering temperature on microstructural evolution and compression behaviour was studied in detail. It was concluded that the sample consolidated at 400 °C exhibited the highest strength. Higher sintering temperature (450 °C) improved the compressive strain of the bulk sample but at the sacrifice of strength. However, samples consolidated at 350 °C displayed brittle behaviour with low strength. All consolidated samples had a bimodal microstructure with nanocrystalline and coarse grains. The nanocrystalline microstructure formed by cryomilling was retained after consolidation and a maximum microhardness was approximately 150 HV. The bulk samples consolidated at 400 °C with an average grain size of 45 nm showed exceptional average true compressive yield strength of 400.7 MPa, true ultimate compressive strength of 499.7 MPa, which was superior to published results for most of conventional magnesium alloys. Although nanostructured materials usually have high strength but poor ductility, the material in this study exhibited high strength and a true compressive strain of 0.036
Thermal Stability of Cryomilled Mg Alloy Powder
No full textIn this paper, the thermal stability of cryomilled nanocrystalline (NC) AZ31 powder was evaluated by annealing at elevated temperature ranging from 350 to 450 °C. The results show the NC AZ31 powder exhibited excellent thermal stability during short anneals at 350–450 °C, and the mechanisms were investigated in detail. There were two separate growth stages with a transition point at around 400 °C. More specifically, between 350 and 400 °C, NC Mg grains were stable at approximately 32 nm, even after 1 h annealing. At 450 °C, the nano grains grew to 37 nm in the first 5 min and grew quickly to approximately 60 nm after 15 min. However, the grain growth was limited when the annealing time was increased to 60 min. The average grain size remained stable less than approximately 60 nm even after long anneals at temperatures as high as 450 °C (0.78 T/TM), indicating an outstanding degree of grain size stability. This excellent thermal stability can be mainly attributed to solute drag and Zener pinning
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