On the spectrum of the twisted Dolbeault Laplacian over K\"ahler manifolds

We use Dirac operator techniques to a establish sharp lower bound for the first eigenvalue of the Dolbeault Laplacian twisted by Hermitian-Einstein connections on vector bundles of negative degree over compact K\"ahler manifolds.Comment: 14 pages. Completely revised: estimates corrected and shown to be shar

Vector bundles on projective varieties and representations of quivers

We present equivalences between certain categories of vector bundles on projective varieties, namely cokernel bundles, Steiner bundles, syzygy bundles, and monads, and full subcategories of representations of certain quivers. As an application, we provide decomposability criteria for such bundles.Comment: 29 pages. Partially overlaps with arXiv:1210.7835. To appear in Algebra and Discrete Mathematic

New divisors in the boundary of the instanton moduli space

Let ${\mathcal I}(n)$ denote the moduli space of rank $2$ instanton bundles of charge $n$ on ${\mathbb P}^3$. It is known that ${\mathcal I}(n)$ is an irreducible, nonsingular and affine variety of dimension $8n-3$. Since every rank $2$ instanton bundle on ${\mathbb P}^3$ is stable, we may regard ${\mathcal I}(n)$ as an open subset of the projective Gieseker-Maruyama moduli scheme ${\mathcal M}(n)$ of rank $2$ semistable torsion free sheaves $F$ on ${\mathbb P}^3$ with Chern classes $c_1=c_3=0$ and $c_2=n$, and consider the closure $\overline{{\mathcal I}(n)}$ of ${\mathcal I}(n)$ in ${\mathcal M}(n)$. We construct some of the irreducible components of dimension $8n-4$ of the boundary $\partial{\mathcal I}(n):=\overline{{\mathcal I}(n)}\setminus{\mathcal I}(n)$. These components generically lie in the smooth locus of ${\mathcal M}(n)$ and consist of rank $2$ torsion free instanton sheaves with singularities along rational curves

THE CORSET AND THE HIJAB: THE DISCURSIVISATION OF IDENTITY BETWEEN THE WEST AND THE ORIENT

The present thesis contains the commentary reviewing nine publications produced and submitted between 2016 and 2020. The portfolio debates the intersection of Communication and Semiotics theories, utilised in the study of Fashion and the Body as media displaying multifarious relations of communication which, through their iterations in culture, generate the interactions between human subjects, which are the foundation of the social milieu. Throughout the sections, the matter is explored in the proposition of a method to the study of rhythmic changes and their alternation, which is employed in a series of analyses addressing Western dress and the hijab, to then unfold into the works’ core contribution: the postulation of the West and the Orient in parallel, rather than viewed as opposed cultural practices. Utilising mainly the Semiotic and Socio-semiotic Theories developed by Greimas (1970, 1983, 1984, 1986, 1987, 2000; Greimas & Courtés, 1993) and Landowski (1992, 1997, 2004, 2005, 2009, 2010,2014, 2017) as a foundation to the construction of our methodology (Jardim, 2021c), the work merges Post-colonial Theory (Ahmed, 2006; Bhabha, 1994; Buruma & Margalit, 2004; Lévi-Strauss, 1952; Said, 2003; Spivak, 1999), and works about the corset (Jardim, 2014; Kunzle, 2004; Steele, 1997, 2001) and the hijab (Ahmed, 2011; El Guindi, 1999; Shirazi, 2003) to promote an examination of the objects as communication praxes constructing and disseminating ideas linked to the role of women, as well as discourses about Culture, Identity, and Religion. The investigation results in questioning multiple relations of power articulated through various media of communication—the verbal use of language and the discourses it creates but, equally, the visual dimension of the body, dress, and the imagery constructed around them— rejecting the dogmatic binaries which form our current worldview to, instead, observe the semio-narrative structures of discourses and practises which reveal the entanglement of Western and Oriental dress practices

Interoperability and Standards: The Way for Innovative Design in Networked Working Environments

Organised by: Cranfield UniversityIn today’s networked economy, strategic business partnerships and outsourcing has become the dominant paradigm where companies focus on core competencies and skills, as creative design, manufacturing, or selling. However, achieving seamless interoperability is an ongoing challenge these networks are facing, due to their distributed and heterogeneous nature. Part of the solution relies on adoption of standards for design and product data representation, but for sectors predominantly characterized by SMEs, such as the furniture sector, implementations need to be tailored to reduce costs. This paper recommends a set of best practices for the fast adoption of the ISO funStep standard modules and presents a framework that enables the usage of visualization data as a way to reduce costs in manufacturing and electronic catalogue design.Mori Seiki – The Machine Tool Compan

Measurement of the 0.511 MeV gamma ray line from the Galactic Center

The detection of the 0.511 MeV electron positron annihilation line coming from the Galactic Center to provide the means to estimate the rate of positron production and to test some theoretical sources of positrons is addressed. The results of the measurements of the 0.511 MeV line flux made with a gamma ray experiment on board a stratospheric balloon are presented. The detector field of view looked at the galactic longitude range -31 deg l(II) +41 deg. The observed flux is 0.0067 (+ or - 0.0005) photons 1/cm(2)5 which is in very good agreement with the expected flux when assuming that the Galactic Center is a line source emitting uniformly

Cyber-Physical Systems: a multi-criteria assessment for Internet-of-Things (IoT) systems

This research work was partially supported by funds provided by the European Commission in the scope of FoF/H2020-636909 C2NET, FoF/H2020-723710 vf-OS and ICT/H2020-825631 ZDMP.This article addresses a multi-criteria decision problem regarding the more suitable device (system) to perform a task for cyber-physical systems. New embedded systems provided everyday makes engineers’ decision very difficult. Components are proposed to formally describe solutions, criteria, constraints and priorities, taking into account users’ specific aspects. To materialise all formal descriptions, a model-driven approach is followed, allowing the design of enablers for interoperability with standards. It is enabled the use of different software languages and decision methods. Proposed framework enables a better Internet-of-Things system selection, and therefore stakeholders can perform a more suitable design of their cyber-physical enterprise systems.authorsversioninpres