840 research outputs found
Searching for Very High Energy Emission from Pulsars Using the High Altitude Water Cherenkov (HAWC) Observatory
There are currently over 160 known gamma-ray pulsars. While most of them are
detected only from space, at least two are now seen also from the ground. MAGIC
and VERITAS have measured the gamma ray pulsed emission of the Crab pulsar up
to hundreds of GeV and more recently MAGIC has reported emission at
TeV. Furthermore, in the Southern Hemisphere, H.E.S.S. has detected the Vela
pulsar above 30 GeV. In addition, non-pulsed TeV emission coincident with
pulsars has been detected by many groups, including the Milagro Collaboration.
These GeV-TeV observations open the possibility of searching for
very-high-energy (VHE, > 100GeV) pulsations from gamma-rays pulsars in the HAWC
field of view.Comment: Presented at the 34th International Cosmic Ray Conference (ICRC2015),
The Hague, The Netherlands. See arXiv:1508.03327 for all HAWC contribution
No measure for culture? Value in the new economy
This paper explores articulations of the value of investment in culture and the arts through a critical discourse analysis of policy documents, reports and academic commentary since 1997. It argues that in this period, discourses around the value of culture have moved from a focus on the direct economic contributions of the culture industries to their indirect economic benefits. These indirect benefits are discussed here under three main headings: creativity and innovation, employability, and social inclusion. These are in turn analysed in terms of three forms of capital: human, social and cultural. The paper concludes with an analysis of this discursive shift through the lens of autonomist Marxist concerns with the labour of social reproduction. It is our argument that, in contemporary policy discourses on culture and the arts, the government in the UK is increasingly concerned with the use of culture to form the social in the image of capital. As such, we must turn our attention beyond the walls of the factory in order to understand the contemporary capitalist production of value and resistance to it. </jats:p
Rethinking the social impacts of the arts
The paper presents a critical discussion of the current debate over the social impacts of the arts in the UK. It argues that the accepted understanding of the terms of the debate is rooted in a number of assumptions and beliefs that are rarely questioned. The paper goes on to present the interim findings of a threeâyear research project, which aims to rethink the social impact of the arts, with a view to determining how these impacts might be better understood. The desirability of a historical approach is articulated, and a classification of the claims made within the Western intellectual tradition for what the arts âdoâ to people is presented and discussed
Determinants of impact : towards a better understanding of encounters with the arts
The article argues that current methods for assessing the impact of the arts are largely based on a fragmented and incomplete understanding of the cognitive, psychological and socio-cultural dynamics that govern the aesthetic experience. It postulates that a better grasp of the interaction between the individual and the work of art is the necessary foundation for a genuine understanding of how the arts can affect people. Through a critique of philosophical and empirical attempts to capture the main features of the aesthetic encounter, the article draws attention to the gaps in our current understanding of the responses to art. It proposes a classification and exploration of the factorsâsocial, cultural and psychologicalâthat contribute to shaping the aesthetic experience, thus determining the possibility of impact. The âdeterminants of impactâ identified are distinguished into three groups: those that are inherent to the individual who interacts with the artwork; those that are inherent to the artwork; and âenvironmental factorsâ, which are extrinsic to both the individual and the artwork. The article concludes that any meaningful attempt to assess the impact of the arts would need to take these âdeterminants of impactâ into account, in order to capture the multidimensional and subjective nature of the aesthetic experience
Urea-Doped Calcium Phosphate Nanoparticles as Sustainable Nitrogen Nanofertilizers for Viticulture: Implications on Yield and Quality of Pinot Gris Grapevines
In recent years, the application of nanotechnology for the development of new âsmart
fertilizersâ is regarded as one of the most promising solutions for boosting a more sustainable and
modern grapevine cultivation. Despite showing interesting potential benefits over conventional fertilization practices, the use of nanofertilizers in viticulture is still underexplored. In this work, we
investigated the effectiveness of non-toxic calcium phosphate nanoparticles (Ca3(PO4)2ânH2O)
doped with urea (U-ACP) as a nitrogen source for grapevine fertilization. Plant tests were performed for two years (2019â2020) on potted adult Pinot gris cv. vines grown under semi-controlled
conditions. Four fertilization treatments were compared: N1: commercial granular fertilization (45
kg N haâ1); N2: U-ACP applied in fertigation (36 kg N haâ1); N3: foliar application of U-ACP (36 kg
N haâ1); C: control, receiving no N fertilization. Plant nitrogen status (SPAD), yield parameters as
well as those of berry quality were analyzed. Results here presented clearly show the capability of
vine plants to recognize and use the nitrogen supplied with U-ACP nanoparticles either when applied foliarly or to the soil. Moreover, all of the qualiâquantitative parameters measured in vine
plants fed with nanoparticles were perfectly comparable to those of plants grown in conventional
condition, despite the restrained dosage of nitrogen applied with the nanoparticles. Therefore, these
results provide both clear evidence of the efficacy of U-ACP nanoparticles as a nitrogen source and
the basis for the development of alternative nitrogen fertilization strategies, optimizing the dosage/benefit ratio and being particularly interesting in a context of a more sustainable and modern
viticulture.PSR 2014/2020 Regione Autonoma Friuli Venezia GiuliaâMisure 16.1.1, DGR 1313/2018, DC 398/AGFOR 2020âGESOVIT PROJECTFondazione Cariplo, Italy, Grant n. 2016-0648, project: Romancing the stone: size controlled HYdroxyaPATItes for sustainable Agriculture (HYPATIA
The unacknowledged legacy
This paper presents a critical discussion of the treatment of mimetic art, and particularly poetry and the theatre, in the work of the Athenian philosopher Plato (427-347 BC). It centres on Plato's discussion of the corrupting powers of the arts in the Republic, and the implications that his fierce attack on poetry and theatre have for his construction of the ideal polity. The legacy of Platonic ideas in later elaborations of the corrupting power of the arts is discussed. Furthermore, the paper investigates the relationship between current debates on cultural policy and the Platonic idea that the transformative powers of the arts ought to be harnessed by the state to promote a just society. The conclusion thus reached is that âinstrumental cultural policyâ, rather then being a modern invention, was in fact first theorized precisely in Plato's Republic
MUSE AO spectroscopy confirms five dual AGNs and two strongly lensed QSOs at sub-arcsec separation
The novel Gaia Multi Peak (GMP) technique has proven to be able to
successfully select dual and lensed AGN candidates at sub-arcsec separations.
Both populations are important because dual AGNs represent one of the central,
still largely untested, predictions of lamdaCDM cosmology, and compact lensed
quasars allow to probe the central regions of the lensing galaxies. In this
work, we present high spatial resolution spectroscopy of twelve GMP-selected
systems. We use the the adaptive-optics assisted integral-field spectrograph
MUSE at VLT to resolve each system and study the nature of each component. All
the targets reveal the presence of two components confirming the GMP selection.
We classify five targets as dual AGNs, two as lensed systems, and five as a
chance alignment of a star and and AGN. Having separations between 0.30" and
0.86", these dual and lensed systems are, to date, among the most compact ever
discovered at z >0.3. This is the largest sample of distant dual AGNs with
sub-arcsec separations ever presented in a single paper.Comment: 11 pages, 9 figure
Feedback and ionized gas outflows in four low-radio power AGN at <em>z</em> ⌠0.15
\ua9 2024 EDP Sciences. All rights reserved. An increasing number of observations and simulations suggests that low-power (< 1044 erg s1) jets may be a significant channel of feedback produced by active galactic nuclei (AGN), but little is known about their actual effect on their host galaxies from the observational point of view. We targeted four luminous type 2 AGN hosting moderately powerful radio emission (âŒ1044 erg s1), two of which and possibly a third are associated with jets, with optical integral field spectroscopy observations from the Multi Unit Spectroscopic Explorer (MUSE) at the Very Large Telescope (VLT) to analyze the properties of their ionized gas as well as the properties and effects of ionized outflows. We combined these observations with Very Large Array (VLA) and e-MERLIN data to investigate the relations and interactions between the radio jets and host galaxies. We detected ionized outflows as traced by the fast bulk motion of the gas. The outflows extended over kiloparsec scales in the direction of the jet, when present. In the two sources with resolved radio jets, we detected a strong enhancement in the emission-line velocity dispersion (up to 1000 km s1) perpendicular to the direction of the radio jets. We also found a correlation between the mass and the energetics of this high-velocity dispersion gas and the radio power, which supports the idea that the radio emission may cause the enhanced turbulence. This phenomenon, which is now being observed in an increasing number of objects, might represent an important channel for AGN feedback on galaxie
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