1,720,971 research outputs found
Byzantine aqueducts of Constantinople outside the city
No full textThis dataset is related to the PhD research of Francesca Ruggeri, published in the thesis "Engineering the Byzantine Water Supply of Constantinople: mapping, hydrology and hydraulics of the long aqueducts outside the City" (2018) http://hdl.handle.net/1842/31521. This aims at providing additional material resulting from the GIS work presented in Chapter 5 of the thesis. Archaeological survey data were available from previous campaigns carried out by Prof. James Crow in the years 1995-2009 in Turkish Thrace. Such data were systematically reassessed and organised by the author to create a comprehensive database of the remains of the Byzantine aqueducts of Constantinople.
This dataset includes:
maps of the Byzantine aqueducts and related features, as image files [map];
map locations viewable in Google Earth/Google Maps, as .kmz files [kmz];
shapefiles of Water Supply route and features for GIS use [shp];
lists of features (bridges, tunnels, channels), as Excel files [excel].
All maps and GIS features were created in ESRI ArcMap by F Ruggeri.This dataset includes:
maps of the Byzantine aqueducts and related features, as image files [map];
map locations viewable in Google Earth/Google Maps, as .kmz files [kmz];
shapefiles of Water Supply route and features for GIS use [shp];
lists of features (bridges, tunnels, channels), as Excel files [excel].
All maps and GIS features were created in ESRI ArcMap by F Ruggeri
Engineering the Byzantine water supply of Constantinople: mapping, hydrology and hydraulics of the long aqueducts outside the city
Full text linkThe Water Supply of Byzantine Constantinople is one of the most outstanding
achievements of hydraulic engineering from the Roman world. Working entirely as a
gravity-fed system, this infrastructure relied on hundreds of kilometres of masonry
channels, winding along the hills of Turkish Thrace and carrying water to
Constantinople across different watersheds. The Water Supply was built in two main
phases: the first in the mid-fourth century, following the foundation of
Constantinople in 330 AD; and the second in the early fifth century. It is not clear
whether the aqueducts from these two phases worked independently or as a single
system, yet the scale of this would have been colossal, reaching lengths of 450 km
between the two aqueducts.
However, a full and close understanding of its hydraulic design and function has
until now been missing. As such, this investigation aims to: (1) establish a clear route
for the aqueducts, both in terms of length and gradient (mapping); (2) determine
likely volumes of water entering the system at the various intakes (hydrology); and
(3) evaluate its hydraulic behaviour and flow characteristics (hydraulics). While
previous work on similar Roman aqueducts yielded only estimates of maximum
capacity, this work delves into the engineering of the ancient infrastructure to
provide a more realistic assessment of theWater Supply discharge to the City.
The physical configuration of the aqueducts is reinterpreted based on the latest
archaeological records comprising Global Positioning System (GPS) measurements
and field observations, and validated against modern satellite terrain data in a
Geographic Information System (GIS). Refined estimates of length and gradient are
proposed, along with a reassessment of all channel observations, bridges and tunnels
along the system. It is found that the total length of the aqueducts would have been
around 426 km if they operated as a single system, and up to 565 km if they
continued in parallel all the way to Constantinople; the gradient of the system would
have been well below 0.1% throughout, decreasing from upstream to downstream,
with steeper slopes only at the intakes.
To estimate reasoned inflow conditions for the Water Supply intakes at the time of its
operation, modern spring flow records are investigated, and climatic changes from
the Early Byzantine period are studied by means of Macrophysical Climate
Modelling (MCM). Monthly and daily resolutions are addressed: monthly inflow
data can capture the extent of the seasonal variations that may have occurred at the
springs, accounting for karst hydrogeology; daily inflow data allows the study of
flow attenuation in the Water Supply in the short term. Simplified models and
engineering judgement are employed to recreate monthly and daily inflow series
from limited modern data for karstic springs and weather stations in Thrace.
The results from GIS mapping, combined with the proposed inflow scenarios, are
used to develop open-channel flow modelling of the Water Supply at a global scale.
Aqueduct flow is numerically simulated by means of both steady (monthly) and
unsteady (daily) analysis using the river modelling software HEC-RAS. The system
capacity and hydraulic performance are studied for the fourth and fifth century
aqueducts operating either as parallel lines or joining into a single system. An
estimation of water delivered to Constantinople is proposed for typical dry, average
and wet years. Results of this work are employed in a parallel research investigation
on the management and distribution of water within the ancient city
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
EPIGRAFIA ROMANA IN SARDEGNA. Atti del I Convegno di studio Sant'Antioco, 14-15 luglio 2007 (=Incontri insulari, 1)
No full text- …
