ORCID Profile
0000-0002-5832-1777
Current Organisation
Pontifícia Universidade Católica de Minas Gerais
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Publisher: FapUNIFESP (SciELO)
Date: 08-2020
DOI: 10.1590/S0102-8529.2019420200002
Abstract: Abstract Based on the theoretical frameworks of Carl Schmitt (hostis and inimicus), Giorgio Agamben (field and homo sacer), and Grégoire Chamayou (hunter-states and kill boxes), and being seen through the theoretical lens of post-structuralism in International Relations, this article aims to analyse the use of drones, especially Unmanned Combat Aerial Vehicles (UCAVs), in the ‘War on Terror’ led by the USA. In this context, we seek to demonstrate how the use of drones has affected the logic of current warfare scenarios in three different, but related aspects. First of all (Act One), the use of drones makes the construction of political otherness of the enemy impossible, and thus identity construction by counterpoint impracticable. Then (Act Two), this paper demonstrates how there is an attempt to move the enemy to the externality of the International Community, relegating their status to banishment and marginalisation. Finally (Act Three), the authors analyse the role of kill boxes and how the solution given by this phenomenon subverts the traditional notions of sovereignty, challenging the very raison d’être of politics.
Publisher: FapUNIFESP (SciELO)
Date: 2020
Publisher: FapUNIFESP (SciELO)
Date: 12-2019
DOI: 10.1590/S0102-8529.2019410300008
Abstract: Abstract Jacques Derrida delivered the basis of The Specters of Marx: The State of the Debt, the Work of Mourning, & the New International as a plenary address at the conference ‘Whither Marxism?’ hosted by the University of California, Riverside, in 1993. The longer book version was published in French the same year and appeared in English and Portuguese the following year. In the decade after the publication of Specters, Derrida’s analyses provoked a large critical literature and invited both consternation and celebration by figures such as Antonio Negri, Wendy Brown and Frederic Jameson. This forum seeks to stimulate new reflections on Derrida, deconstruction and Specters of Marx by considering how the futures past announced by the book have fared after an eventful quarter century. In this group of contributions, Aggie Hirst and Tom Houseman, Paulo Cesar Duque-Estrada, Jenny Edkins and Cristiano Mendes reflect on the legacies of Marx and Derrida: on whether Derrida emphasized the wrong Marxian heritage, on the promise and risks of hauntology, on the ghostly potential for justice amidst devastation, and on the paradox of deconstruction’s legacy itself.
Publisher: Informa UK Limited
Date: 12-2011
Publisher: Elsevier BV
Date: 2023
DOI: 10.1016/J.JCIS.2022.10.069
Abstract: Dairy proteins and mono- and diglycerides (MDG) are often used in unison to tailor the properties of dairy-based emulsions. However, there are significant gaps in our understanding of how proteins affect lipid crystallisation at the oil-water interface. We have used a unique combination of interfacially-sensitive techniques to elucidate the impact of dairy proteins on interfacial MDG crystal formation. The formation temperature of interfacial MDG crystals was assessed through interfacial tension studies via drop shape analysis. Small and Wide-Angle X-ray Scattering measurements were performed on isolated oil-water interfaces, allowing for in-situ interrogation of MDG crystal structure and concentration at and near the interface. Dairy proteins are seen to reduce the temperature at which MDG crystals form at the oil-water interface. The displacement of proteins upon interfacial crystal formation was also clearly observed in interfacial tension measurements. For the first time, lipid crystals formed at the oil-water interface have been characterised using X-ray scattering. All scattering studies showed no change to the MDG crystal structures at the oil-water interface in the presence of adsorbed proteins. The results demonstrate that informed selection of emulsifier components is critical to controlling interfacial crystallisation with concomitant impact on emulsion stability.
Publisher: MDPI AG
Date: 16-10-2022
Abstract: The crystallinity of polymers strongly affects their properties. For block copolymers, whereby two crystallisable blocks are covalently tethered to one another, the molecular weight of the in idual blocks and their relative weight fraction are important structural parameters that control their crystallisation. In the case of block copolymer micelles, these parameters can influence the crystallinity of the core, which has implications for drug encapsulation and release. Therefore, in this study, we aimed to determine how the microstructure of poly(ethylene glycol-b-caprolactone) (PEG-b-PCL) copolymers contributes to the crystallinity of their hydrophobic PCL micelle cores. Using a library of PEG-b-PCL copolymers with PEG number-average molecular weight (Mn) values of 2, 5, and 10 kDa and weight fractions of PCL (fPCL) ranging from 0.11 to 0.67, the thermal behaviour and morphology were studied in blends, bulk, and micelles using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WXRD), and Synchrotron wide-angle X-ray scattering (WAXS). Compared to PEG and PCL homopolymers, the block copolymers displayed reduced crystallinity in the bulk phase and the in idual blocks had a large influence on the crystallisation of one another. The fPCL was determined to be the dominant contributor to the extent and order of crystallisation of the two blocks. When fPCL 0.35, the initial crystallisation of PEG led to an amorphous PCL phase. At fPCL values between 0.35 and 0.65, PEG crystallisation was followed by PCL crystallisation, whereas this behaviour was reversed when fPCL 0.65. For lyophilised PEG-b-PCL micelles, the crystallinity of the core increased with increasing fPCL, although the core was predominately amorphous for micelles with fPCL 0.35. These findings contribute to understanding the relationships between copolymer microstructure and micelle core crystallinity that are important for the design and performance of micellar drug delivery systems, and the broader application of polymer micelles.
Publisher: FapUNIFESP (SciELO)
Date: 08-2017
Abstract: Resumo Este artigo interroga o conceito de Estado falido conforme apresentado pela política externa dos Estados Unidos (EUA). O argumento desenvolve três pontos principais. Primeiramente, a ideia de fracasso estatal repousa sobre a compreensão de que países fracassam por não executarem no presente o que se espera de Estados soberanos. Em segundo lugar, as reconstruções dos Estados assentam-se sobre a ideia de que, em algum momento do passado, conseguiram exercer minimamente as funções consideradas essenciais a qualquer Estado e podem ser recolocados numa trajetória de progresso. Finalmente, a ingerência externa estadunidense não derivaria apenas da percepção de uma situação atípica: a premissa de decidir sobre a exceção seria uma das facetas da afirmação da identidade de Estado soberano dos EUA.
No related grants have been discovered for Cristiano Mendes.