1,720,963 research outputs found
Low-pressure plasma treatments for cleaning metallic heritage artefacts
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
Sensor network for museum environmental monitoring
Full text linkMuseum environmental monitoring is an important
issue for the artifact conservation. Many solutions have been
proposed to tackle this problem, but the museum constraints
prevent an easy application in several cases, especially if the
monitoring has to be performed in museums where an environmental
control system has been already installed. This paper
describes a simple though powerful solution, which complies with
most of the common constraints and which is based on small
sensors implementing a BT-LE wireless protocol coupled with
a receiving architecture. The sensing nodes have dimensions of
few centimeters, do not require cabling and power supply, and
can work unattended for several years. Data are collected by
a receiving architecture, which can work either on-line, with
immediate data delivery, or off-line when an Internet connection
is not available. Users can browse the measurements by using
their smart-phones from any place and can download the data
on their personal computer. In addition they can browse locally
the data also in the absence of any data connection, such as in
the case of remote and or recessed sites. The proposed solution
has been deployed in three museums, also in the basements, and
in an ancient building proving its flexibility and capability to be
adapted to the different conditions
Cloud infrastructure for museum environmental monitoring
Full text linkThis paper describes a cloud based architecture which has been designed for the monitoring of Cultural Heritage buildings. The architecture has been deployed in museums and basements proving its capabilities. The solution is composed of small sensing nodes with volume lower than 8 cm3 and dimensions of 2.5 cm × 1.5 cm which are capable of acquiring temperature and relative humidity for interval in excess of one year. The nodes are battery operated and communicate wireless to small Arduino-based concentrators connected to the internet and to a cloud storage. Data from all the nodes are made available to on the curator's smart phones in real time so that the entire building can be monitored from everywhere. The nodes have the capability of locally storing all the measurements for quality assurance and if either the internet connection is not available or the power supply is missing, the proposed system has the possibility of manually uploading data to the cloud after having transferred them from the nodes to a battery operated PC
Survey on the Moisture and Ash Contents in Agricultural Commodities in Al-Rass Governorate, Saudi Arabia in 2017
No full textResearchers and governments are paid great interest concerning food safety and quality of food stuff. Determination of moisture and ash contents was ac-complished by using simple, easy and low cost method to establish a database for agricultural commodities.Twenty four types of agricultural commodities were collected from the local market in Al-Rass governorate, Al-Qassim region, Saudi Arabia. The samples were collected in the period from the beginning of January 2017 to the end of July 2017. The survey show that higher values of moisture contents were found in tomato and cucumber (95.79 and 94.65%, respectively)while the higher values of ash content were found in leafy vegetables in particu-lar spinach and watercress of 1.91% and 1.51% respectivel
Determination of the Level of Organophosphorus Pesticides in Tomato Using GC-MS/MS and the Concentration of Some Heavy Metals Using FAAS
No full textThis study was carried out to develop and apply a quick, yet efficient, analytical method for simultaneous determination of the residues of the 86 pesticides repeatedly detected in food commodity in Al-Rass province of Al-Qassim Region, Saudi Arabia. The suggested method is based on QuEChERS extraction procedures based on acetonitrile followed by a dispersive solid-phase extraction (d-SPE) with primary-secondary amine (PSA) and bulk of carbograph for clean-up, was applied prior to GC-MS/MS analysis, focusing in particular on tomato crops. The second aim of the study was to measure the levels of some heavy metals using FAAS technique, particularly, Cu, Cd, Zn, Fe and Pb. The third aim was to evaluate the effectiveness of some common household-type preparations and handling procedures for tomato on reducing the levels of the detected pesticide residues as well as the heavy metals. The current findings could provide that the proper home preparation of tomato samples, in particular, soaking in 2% sodium chloride solution and soaking in commercial 5% acetic acid has led to effective elimination of the pesticide ethion from those samples. However, results have shown that there was no significant effect on the levels of heavy metals in the investigated tomato samples after applying the common types of household treatments
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
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