Study of Resistive Micromegas in a Mixed Neutron and Photon Radiation Field

The Muon ATLAS Micromegas Activity (MAMMA) focuses on the development and testing of large-area muon detectors based on the bulk-Micromegas technology. These detectors are candidates for the upgrade of the ATLAS Muon System in view of the luminosity upgrade of Large Hadron Collider at CERN (sLHC). They will combine trigger and precision measurement capability in a single device. A novel protection scheme using resistive strips above the readout electrode has been developed. The response and sparking properties of resistive Micromegas detectors were successfully tested in a mixed (neutron and gamma) high radiation field supplied by the Tandem accelerator, at the N.C.S.R. Demokritos in Athens. Monte-Carlo studies have been employed to study the effect of 5.5 MeV neutrons impinging on Micromegas detectors. The response of the Micromegas detectors on the photons originating from the inevitable neutron inelastic scattering on the surrounding materials of the experimental facility was also studied

Substrate Optimization for Integrated Circuit Antennas

The reciprocity theorem and integral equation techniques are employed to determine the properties of integrated-circuit antennas. The effect of surface waves is considered for dipole and slot elements on substrates. The radiation and bandwidth of microstrip dipoles are optimized in terms of substrate thickness and permittivity

Identification of circles from datapoints using Gaussian sums

We present a pattern recognition method which use datapoints on a plane and estimates the parameters of a circle. MC data are generated in order to test the method's efficiency over noise hits, uncertainty in the hits positions and number of datapoints. The scenario were the hits from a quadrant of the circle are missing is also considered. The method proposed is proven to be robust, accurate and very efficient.Comment: 4 pages, 5 figure

A k-omega-multivariate beta PDF for supersonic combustion

In an attempt to study the interaction between combustion and turbulence in supersonic flows, an assumed PDF has been employed. This makes it possible to calculate the time average of the chemical source terms that appear in the species conservation equations. In order to determine the averages indicated in an equation, two transport equations, one for the temperature (enthalpy) variance and one for Q, are required. Model equations are formulated for such quantities. The turbulent time scale controls the evolution. An algebraic model similar to that used by Eklund et al was used in an attempt to predict the recent measurements of Cheng et al. Predictions were satisfactory before ignition but were less satisfactory after ignition. One of the reasons for this behavior is the inadequacy of the algebraic turbulence model employed. Because of this, the objective of this work is to develop a k-omega model to remedy the situation

Gender exclusion and local values versus universal cultural heritage significance: the Avaton debate on the monastic community of Mount Athos

This article explores the discrepancy between ‘universal values’ and ‘local values’ in the case of world heritage sites of sacred/religious nature. It focuses on the example of the world heritage site of Mount Athos, a self-administered peninsula in Northern Greece inhabited by an Orthodox monastic peninsula and accessible only to male visitors/pilgrims. Special emphasis will be placed on the Avaton rule (prohibition of access to women) which has constituted an issue of debate since the inclusion of Greece in the European Union and, to some extent, since the inscription of Mt Athos to the World Heritage List. The issue of Avaton generates the question: “should a religious site of local, national and international significance that excludes half of the world population be designated as a heritage place of universal value?

Co-creating sustainable food futures with botanical gardens and communities: reflections from the BigPicnic project

This article addresses the potential of participatory approaches and processes of co-creation in the context of botanical gardens. It examines how such approaches can not only help cultural heritage sector organisations to engage with different members of their public, but also how they can work with their communities to tackle globally significant societal and environmental goals. Drawing on research conducted for the EU-funded BigPicnic project, this article examines the methodological processes employed by a large consortium of botanical gardens and presents some examples of exhibitions and science cafés that attempted to both highlight issues of food security and sustainability and foster forms of knowledge that go beyond the dichotomy between experts and non-experts. A critical overview of the outcomes of this project serves to outline the potential of co-creation for promoting sustainable food futures

The social ecology of food: where agroecology and heritage meet

The current food system is unsustainable and no longer able to cope with the challenges caused by climate change and consumer behaviours. In this context, agroecology, with its commitment to crossing disciplinary boundaries, has been endorsed as one of the main approaches to the creation of a sustainable food system. Despite this, the integration of the social research on food has not been evident enough in agroecology as a discipline. To be sure, studies related to foodways, food traditions, and, more recently, food heritage have long been present, and have provided important insights into the social and cultural aspects of food. However, there appears to be little convergence between this body of research and the mainstream agroecology literature. This paper aims to address this disconnection between the sociocultural and environmental aspects of the food system, and to propose ways of moving forward. We argue that knowledge about food heritage can be a catalyst for the achievement of agroecology’s vision for whole-system transformative change, and a moving towards global food security and nutrition. Using the agroecology framework of the United Nation’s Food and Agriculture Organization (FAO) and looking at the examples of the subak system in Indonesia and the EU-funded BigPicnic project, we employ the elements of ‘co-creation and sharing of knowledge’, ‘culture and food traditions’ and ‘human and social values’ as entry points for the creation of sustainable transitions of the food and agricultural systems

Maternal pomegranate juice intake and brain structure and function in infants with intrauterine growth restriction: A randomized controlled pilot study.

Polyphenol-rich pomegranate juice has been shown to have benefit as a neuroprotectant in animal models of neonatal hypoxic-ischemia. No published studies have investigated maternal polyphenol administration as a potential neuroprotectant in at-risk newborns, such as those with intrauterine growth restriction (IUGR). This was a randomized, placebo-controlled, double-blind pilot study to investigate the impact of maternal pomegranate juice intake in pregnancies with IUGR, on newborn brain structure and function at term-equivalent age (TEA). Mothers with IUGR at 24-34 weeks\u27 gestation were recruited from Barnes-Jewish Hospital obstetrical clinic. Consented mothers were randomized to treatment (8 oz. pomegranate juice) or placebo (8 oz. polyphenol-free juice) and continued to take juice daily from enrollment until delivery (mean 20.1 and 27.1 days, respectively). Infants underwent brain MRI at TEA (36-41 weeks\u27 gestation). Brain measures were compared between groups including: brain injury score, brain metrics, brain volumes, diffusion tensor imaging and resting state functional connectivity. Statistical analyses were undertaken as modified intention-to-treat (including randomized participants who received their allocated intervention and whose infants received brain MRI) and per-protocol (including participants who strictly adhered to the protocol, based on metabolite status). Seventy-seven mothers were randomized to treatment (n = 40) or placebo (n = 37). Of these, 28 and 27 infants, respectively, underwent term-equivalent MRI. There were no group differences in brain injury, metrics or volumes. However, treatment subjects displayed reduced diffusivity within the anterior and posterior limbs of the internal capsule compared with placebo. Resting state functional connectivity demonstrated increased correlation and covariance within several networks in treatment subjects, with alterations most apparent in the visual network in per-protocol analyses. Direct effects on health were not found. In conclusion, maternal pomegranate juice intake in pregnancies with known IUGR was associated with altered white matter organization and functional connectivity in the infant brain, suggesting differences in brain structure and function following in utero pomegranate juice exposure, warranting continued investigation. Clinical trial registration. NCT00788866, registered November 11, 2008, initial participant enrollment August 21, 2012

Polynomial Growth Harmonic Functions on Finitely Generated Abelian Groups

In the present paper, we develop geometric analytic techniques on Cayley graphs of finitely generated abelian groups to study the polynomial growth harmonic functions. We develop a geometric analytic proof of the classical Heilbronn theorem and the recent Nayar theorem on polynomial growth harmonic functions on lattices \mathds{Z}^n that does not use a representation formula for harmonic functions. We also calculate the precise dimension of the space of polynomial growth harmonic functions on finitely generated abelian groups. While the Cayley graph not only depends on the abelian group, but also on the choice of a generating set, we find that this dimension depends only on the group itself.Comment: 15 pages, to appear in Ann. Global Anal. Geo