1,720,959 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Space Toilet Technologies and Their Applicability to Various Human Space Missions
No full textPetr Andreychuk, RSC Energia - retired, United StatesICES304: Physico-Chemical Life Support- Waste Management
Systems- Technology and Process DevelopmentThe 54th International Conference on Environmental Systems was held in Prague, Czechia, on 13 July 2025 through 17 July 2025.Receipt and disposal of human waste, urine and feces, in
space is provided by various waste management systems and
disposal and sanitary devices, "space toilets" on space
stations and vehicles. Several factors, such as
microgravity, mission duration, life-support structure, and
waste disposal or recycling capabilities, determine the
choice of technologies and the design of space toilets. The
paper analyzes space toilet technologies based on the
experience of their development and operation on orbital
stations and space vehicles for main functions. Various
schemes of waste reception and separation, urine
pretreatment and quality control of pretreatment, urine
transfer for temporary storage or processing, variants of
urine and solid waste tank designs are considered and their
advantages and disadvantages are analyzed. Based on the
results of the analysis, the paper gives recommendations
for the choice of optimal technologies and types of space
toilets design for space vehicles, orbital stations,
landing modules and planetary surface stations
Results of Space Flight Testing of Water from Urine Recovery Technology Using Centrifugal Multistage Vacuum Distiller
No full textPetr Andreychuk, RSC Energia (Retired), USAICES303: Physico-Chemical Life Support- Water Recovery & Management Systems- Technology and Process DevelopmentThe 53rd International Conference on Environmental Systems was held in Louisville, Kentucky, USA, on 21 July 2024 through 25 July 2024.Water recovery from urine is one of the most important components of the closed life support system complex during a long manned space flight and it requires some of the most complicate technologies. Various negative factors of space flight and microgravity conditions directly affect the peculiarities of both metabolic processes in the human body and technological processes of regeneration, which requires verification of technical characteristics achieved on the ground in real conditions of space flight.
Since April 2018, a space flight experiment has been conducted in the MRM1 ISS module to study the technology of crew urine distillation in a five-stage centrifugal vacuum distiller with additional recovery of condensation heat in a semiconductor heat pump.
During experiment from 2018 to 2023, 290 L of urine was processed and 210 L of untreated water was obtained from which 170 L was used by the crew for the preparation of food and beverages with the preliminary sorption-catalytic purification in the system of water regeneration from the condensate of the SRV-K2M of Service Module. The quality of the recovered water fully met the requirements, the power consumption of the system did not exceed 325 W which is less than designed 360 W. But some system's characteristics in the flight experiment negative differed from the ones obtained in the long-term ground tests:
- Recovery rate was up to 84%, lower than the 90% from the ground tests;
- Significantly lower reliability of individual units of the system in space conditions did not allow to transfer it to permanent operation with water production for crew needs.
The paper analyzes the results of the flight experiment and obtained characteristics of the system based on the centrifugal multistage vacuum distiller, revealed positive sides of the applied technologies, causes of shortcomings and ways of their possible elimination
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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