10,744 research outputs found

    IVOA Recommendation: An IVOA Standard for Unified Content Descriptors Version 1.1

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    This document describes the current understanding of the IVOA controlled vocabulary for describing astronomical data quantities, called Unified Content Descriptors (UCDs). The present document defines a new standard (named UCD1+) improving the first generation of UCDs (hereafter UCD1). The basic idea is to adopt a new syntax and vocabulary requiring little effort for people to adapt softwares already using UCD1. This document also addresses the questions of maintenance and evolution of the UCD1+. Examples of use cases within the VO, and tools for using UCD1+ are also described

    IVOA Recommendation: The UCD1+ controlled vocabulary Version 1.23

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    This document describes the list of controlled terms used to build the Unified Content Descriptors, Version 1+ (UCD1+). The document describing the UCD1+ can be found at the URL: http://www.ivoa.net/Documents/latest/UCD.html. This document reviews the structure of the UCD1+ and presents the current vocabulary

    Ancient Biomolecules Unravel our History: A Technical Update with Examples from the Middle East

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    Context: The study of ancient biomolecules represents a useful tool to address questions related to human history. Objective: This manuscript provides an overview of the major categories of ancient biomolecules, highlighting their potentialities when applied to research. Methods: This study gathered knowledge from recently published papers on paleogenomics, paleoproteomics, ancient lipids and stable isotope analyses with the aim of providing a technical and historical background on ancient biomolecules, and examples of their application in the Arabian Peninsula and Middle East in general. Results: The progress seen in the past decade with regard to the study of ancient biomolecules has led to a dramatic expansion of the studies that apply those analyses. Increasing attention has also been paid to the development and optimization of protocols aimed at reducing and/or preventing the risk of contamination. While extensively applied to Western areas, the study of ancient biomolecules in the Middle East and the Arabian Peninsula has been limited. Conclusions: Research on ancient biomolecules represents the most valuable source of information to understand our evolutionary past at an inconceivable level of detail, especially when applied to areas so far underrepresented in this field, such as the Middle East and the Arabian Peninsula in particular

    How Mitochondrial DNA Can Write Pre-History: Kinship and Culture in Duero Basin (Spain) during Chalcolithic and Bronze Age

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    The chronological period from the beginning of the Chalcolithic Age to the end of the Bronze Age on the Iberian northern sub-plateau of the Iberic Peninsula involves interesting social and cultural phenomena, such as the appearance of the Bell Beaker and, later, the Cogotas I cultures. This work constructs a genetic characterisation of the maternal lineages of the human population that lived on the northern sub-plateau between 5000 and 3000 years ago through an analysis of mitochondrial DNA (mtDNA), a kind of genetic marker that is inherited through maternal lineages, unaltered from generation to generation. Population and cultural questions are investigated through mtDNA analyses. This study intends to shed light on the following questions. Were individuals who were buried together in multiple or collective burials biologically related through their maternal lineages? Were there distinct maternal human lineages in the same or different geographical areas if different material cultures (Bell Beaker and Cogotas I) were associated with the arrival of new human populations who established close biological relationships with the endogenous populations? Or could this be the result of the transmission of knowledge without human populations mixing? Another important question is whether the material cultures were related to the female populations. We analysed 91 individuals from 28 different archaeological sites of the Iberian northern sub-plateau from four different chrono-cultural periods (Pre-Bell Beaker, Bell Beaker, Proto-Cogotas I, and Cogotas I), from the end of the Chalcolithic Age up to the Bronze Age. There were two historical moments of new populations arriving: the first during the Pre-Bell Beaker period, associated with the K mtDNA haplogroup, and the second during the Proto-Cogotas I culture, with new lineages of the H, HVO, and T haplogroups. Neither of these new population flows were directly associated with the maximum development of the two main material cultures Bell Beaker and Cogotas I, so they must have occurred immediately beforehand, during the Pre-Bell Beaker and Proto-Cogotas I periods, respectively. However, we cannot discard an association between the populations and material cultures. Curiously, it has also been observed that there was also a tendency towards multiple burials, in which the individuals who were buried together belonged to the same maternal lineage, during these two periods of population change. This study has shed some light on the populational changes that occurred through these different periods in this specific geographical area of the northern sub-plateau of the Iberian Peninsula

    100 GHz Multiple Colliding Pulse Generation From Cleaved Facet-Free Multi-Section Semiconductor Laser Diode

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    We present a monolithically integrated mode-locked laser (MLL) with 25 GHz fundamental repetition rate frequency, which has been designed to operate in a fourth-order colliding regime, to generate 100 GHz. This device has been fabricated within a multi-project wafer (MPW) run in an InP-based active-passive generic foundry. The Fabry-Perot laser resonator, of around 1.66 mm length, is defined by two on-chip reflectors, eliminating the need of cleaved facet. Three saturable absorber sections are symmetrically located by spacing them a quarter of this total length, dividing the cavity into four gain segments. We show that this structure can generate an electrical beat note at 25 GHz as well as 100 GHz, with a linewidth of 350 kHz and 150 kHz, respectively, operating in passive operation regime

    Capacidade para o trabalho e saĂșde: o que pensam as trabalhadoras da indĂșstria de vestuĂĄrio

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    Este estudo objetivou conhecer como as mulheres que atuam na indĂșstria do vestuĂĄrio em DivinĂłpolis, Minas Gerais, entendem e relacionam os constructos capacidade para o trabalho e saĂșde. Utilizou-se metodologia qualitativa com anĂĄlise dos depoimentos ancorada na teoria das representaçÔes sociais. Os resultados apontaram que a capacidade para o trabalho depende de fatores como capacitação, suporte social, exercĂ­cio da profissĂŁo a domicilio, satisfação com o trabalho, saĂșde e envelhecimento. AlĂ©m disso, ela sofre muitas influĂȘncias externas ao trabalhador, que, por sua vez, precisa constantemente se adaptar Ă s mudanças ocorridas. Os resultados evidenciaram a necessidade de reflexĂŁo sobre o papel das condiçÔes de trabalho e emprego, da rigidez organizacional e da perda de controle sobre o trabalho, na saĂșde e na capacidade para o trabalho das mulheres atuantes na indĂșstria do vestuĂĄrio

    Taking climate action: measuring carbon emissions in the garment sector in Asia

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    This paper examines carbon emissions across the garment sector as counted using the two prominent methodologies for calculating emissions – the life cycle assessment (LCA) and carbon accounting in line with the Greenhouse Gas Protocol. The purpose of this paper is to provide insight into where and why the carbon intensity of textiles and garments varies across the supply chain and where activities to decarbonize the sector should be prioritized.</jats:p
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