Athenaeus the Navigator

Copyright © The Society for the Promotion of Hellenic Studies 2008. Published version reproduced with the permission of the publisher.This study concerns navigation in a geographical sense and in the sense of the reader finding a way through a complex text with the help of points of reference. Recent studies in Athenaeus have suggested that he was a more sophisticated writer than the second-hand compiler of Hellenistic comment on classical Greek authors, which has been a dominant view. Building on these studies, this article argues that Athenaeus' approach to his history of ancient dining draws on traditional poetic links between the symposium and the sea, and expands such metaphors with a major interest in place and provenance, which also belongs to the literature of the symposium. Provenance at the same time evokes a theme of imperial thought, that Rome can attract to herself all the good things of the earth that are now under her sway. Good things include foods and the literary heritage of Greece now housed in imperial libraries. Athenaeus deploys themes of navigation ambiguously, to celebrate diversity and to warn against the dangers of luxury. Notorious examples of luxury are presented – the Sybarites and Capuans, for example – but there seem to be oblique warnings to Rome as well. Much clearer censure is reserved for the gastronomic poem of Archestratus of Gela, which surveys the best cities in which to eat certain fish. The Deipnosophists deplore the immorality of the poet and his radical rewriting of their key authors Homer and Plato, while at the same time quoting him extensively for the range of his reference to geography and fish. This commentary on Archestratus is a good example of the Deipnosophists' guidance to the reader, Roman or otherwise, who wishes to ‘navigate’ the complicated history of the Greek deipnon and symposium

Deltaiot: A real world exemplar for self-adaptive Internet of Things (artifact)

The DeltaIoT exemplar enables researchers to evaluate and compare new methods, techniques and tools for self-adaptation in Internet of Things (IoT). The exemplar applies multi-hop communication, where each IoT mote must have a path towards the gateway along other motes. Our motes use LoRa radio technology supporting long range communication. The focus is on dynamically adapting the network settings of the IoT motes (e.g., transmission power and spreading factor) to reduce the energy consumption of the motes and guaranteeing high packet delivery performance, regardless of uncertainties such as sudden changes in traffic load and communication interference. Traditionally, to deal with uncertainties the network settings are either hand-tuned or over-provisioned, resulting in continuous network maintenance. Self-adaptation can automate these tasks. The exemplar provides several reference scenarios for experimentation. DeltaIoT comprises a simulator for offline experimentation and a physical setup of 25 motes that can be accessed remotely for experimentation in the field. This IoT system is deployed at the Computer Science Department Campus of KU Leuven

DeltaIoT: A Self-Adaptive Internet of Things Exemplar

Internet of Things (IoT) consists of networked tiny embedded computers (motes) that are capable of monitoring and controlling the physical world. Examples range from building security monitoring to smart factories. A central problem of IoT is minimising the energy consumption of the motes, while guaranteeing high packet delivery performance, regardless of uncertainties such as sudden changes in traffic load and communication interference. Traditionally, to deal with uncertainties the network settings are either hand-tuned or over-provisioned, resulting in continuous network maintenance or inefficiencies. Enhancing the IoT network with self-adaptation can automate these tasks. This paper presents DeltaIoT, an exemplar that enables researchers to evaluate and compare new methods, techniques and tools for self-adaptation in IoT. DeltaIoT is the first exemplar for research on self-adaptation that provides both a simulator for offline experimentation and a physical setup that can be accessed remotely for real-world experimentation.</p

Behavior of trace elements and micronutrients in manure digestate during ozone treatment

Digestate treatment techniques have recently been proposed as a strategy to increase the ultimate biogas yield from dairy manure and to improve the digestate quality as an organic fertilizer. These studies however rarely take the trace elements (TE) and nutrient partitioning into account. This study focusses on ozone treatment (5–40 g O3 kg−1 Total Solids (TS)) as a digestate treatment technique to control the concentration of TE and nutrients in the liquid phase of the digestate. Controlling the TE and nutrient concentrations in the liquid and solid digestate can improve the agronomic value of dairy manure digestate. The ozone concentration of the gas stream entering reactor was 48.53 g O3/Nm³ or 3.4% w/w O3 in O2-gas. The experiments were repeated using pure oxygen gas to investigate its influence. The results from ozonation and oxygenation of the dairy manure digestates revealed that O3 treatment up to 40 g O3 kg−1 TS did not have a more pronounced effect on the biochemical parameters compared to supplementation of pure O2. Ozonation of the digestate and the supernatant showed that the TE concentration in the liquid phase followed a parabolic profile. The observed initial increase in this parabolic profile was explained by the release of TE from the organic matter to the supernatant causing an increase in TE concentration, followed by a decrease due to precipitation of TE as hydroxides and sulfides, due to the increasing pH and sulphur concentrations.status: Published onlin