1,720,989 research outputs found
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
Rise 2-Italy trial: how to enroll and start stimulation. A case report.
No full textThe Rise Project opens innovative perspectives about a
comprehensive rehabilitation approach to “chronic and
complete” SCI (spinal cord injury) patients. Health
maintenance, social participation and personal body image
values may change during time and aging of these people.
Denervated muscles of the spine and lower limbs change
their biological properties. Loss of sensibility and muscles
changes are well-known causes of pressure ulcers. Loss of
muscle cells is important for negative effect of gravity on
neuropathic pain, cardiac workload, venous blood
pressure, respiratory reserve, personal and social body
image. Actually electrical stimulation devices of Italian
rehabilitation centers are not useful to stimulate a complete denervated muscle (warm and hot effect and neuropathic
sensation are common effects of those devices on incomplete
SCI patients). Social contest and personal values of patients
and rehabilitators (including biomedical experts, engineering
experts and bioscience experts) can help to start this
integrative project. A personal experience is here described.
A young male patient, 30 years old was recovered 9 months
ago in a Intensive Care Unit for a car-crash injury. Reported
injuries were: a mild brain traumatic injury scored 14 by
GCS (a closed-head injury), multiple bone fractures: thoracic
and lumbar bone fractures, rib fractures, right pneumothorax.
Patient was sedated and a tracheal intubation was performed
(artificial ventilation was performed for 7 days,
anesthesiologic sedation lasted 6 days). First neurologic
examination diagnosed a severe spinal cord injury (spinal
cord traumatic injury) and a spinal stabilization surgery was
performed after 10 days. After 6 months of ICU (intensive
care unit) the patient was treated in a rehabilitation unit and
evaluated by the rehabilitative team. A L1-complete-SCI (no
motor or sensory sensation below L1 level, no anal sensation)
without pressure ulcers was diagnosed and a rehabilitative
project was to ameliorate functional independence and social
participation. Patient learned to use a manual wheelchair, to
upper and lower body dressing ability, to self-perform
intermittent catheterization for a severe urinary retention
(urologic diagnosis was a complete denervated vescical
muscle), to use devices for fecal elimination. Sexual
complete impotence and endocrinologic syndrome was also
diagnosed. The family of the patients was involved in this
learning process. After dismission from the rehabilitation
unit, 4 months later, the patient was teached to use
thecnologic devices for independent car driving. Clinical
integrative evaluation performed by a translational myologist
and physiatrist considered a potential clinical amelioration of
reduced gluteal and quadricepts muscles to prevent pressure
ulcers and ameliorate respiratory and global resistance to
“nomal” daily activities workload. Electrical stimulation test
performed by a myologist and a global water aerobics
exercise program was performed. The RISE Project was
explained to the patients and to his family. The technical
machine used for the electrical stimulation (a FES device) is
not a commercial device used in rehabilitation centers. The
first myology evaluation test diagnosed a selective excitabily
muscles pattern and a non-muscle-tissue fibrotic syndrome
was diagnosed. The myologist and physiatrist decide to ask
the patient about a participation to the RISE Project. A
physiotherapist planned a treatment for the fibrotic syndrome
(hyperflexion of ischiocrural tendons) by using water
exercises and stretching programs. A quantitative analysis of
muscle dimension was planned. The patient gave the consent
to be evaluated in Vienna by dr. Helmut Kern for enrolment
in the RISE Project, that include a pre-training and a posttraining
muscle biopsy. After instruction for the use of the
electrical stimulator for denervated muscles, the Informed
Consent Form was signed September 12, 2008. Then, both
final evaluation for enrolment and pre-FES muscle biopsies
were performed in Vienna [1]. The program with the special
electrical device for home-based training (not available in
Italy) is integrated in a rehabilitative plan and is used to
ameliorate denervated muscles properties and to prevent ulcer
pressure. Quantitative imaging of thigh muscles will be
performed during and at the end of the two-year FES training
by Ultra Sound (US), MRI, and/or TC scan
A new approach to calculating endurance in electric flight and comparing fuel cells and batteries
Full text linkElectric flight is of increasing interest in order to reduce emissions of pollution and greenhouse gases in the aviation field in particular when the takeoff mass is low, as in the case of lightweight cargo transport or remotely controlled drones. The present investigation addresses two key issues in electric flight, namely the correct calculation of the endurance and the comparison between batteries and fuel cells, with a mission-based approach. As a test case, a light Unmanned Aerial Vehicle (UAV) powered exclusively by a Polymer Electrolyte Membrane fuel cell with a gaseous hydrogen tank was compared with the same aircraft powered by different kinds of Lithium batteries sized to match the energy stored in the hydrogen tank. The mass and the volume of each powertrain were calculated with literature data about existing technologies for propellers, motors, batteries and fuel cells. The empty mass and the wing area of the UAV were amended with the mass of the proposed powertrain to explore the range of application of the proposed technologies. To evaluate the efficiency of the whole powertrain a simulation software was used instead of considering only level flight. This software allowed an in-depth analysis on the efficiency of all sub-systems along the flight. The secondary demand of power for auxiliaries was taken into account along with the propulsive power. The main parameter for the comparison was the endurance but the takeoff performance, the volume of the powertrain and the environmental impact were also taken into account. The battery-based powertrain was found to be the most suitable for low-energy applications while the fuel cell performed better when increasing the amount of energy stored on board. The investigation allowed the estimation of the threshold above which the fuel cell based powertrain becomes the best solution for the UAV
Is Selling the Oxygen Produced During Electrolysis Really a Solution to Make Green Hydrogen Cheaper?
No full textInstitutions, companies, research centers and universities are paying special attention to green hydrogen, a key energy carrier for the decarbonization of various sectors because it is produced from renewable sources without producing emissions. Currently, however, the cost of producing it is high and does not make it competitive with that produced from fossil fuels. One way to cut costs could be to exploit the oxygen obtained as a by-product of water electrolysis, selling it instead of releasing it into the atmosphere as is usually done. In some studies, this idea has already been analyzed, but very often without considering the costs due to the additional components for treating the oxygen, which must be properly compressed and stored, or without directly showing how the LCOH (levelized cost of hydrogen) varies according to this choice, especially in an Italian context, limiting the study to an evaluation of the NPV. The paper analyzes plant configurations for the production of green hydrogen installed in southern Italy, in Sicily, in which a photovoltaic system powers an alkaline electrolyzer and two compressors: one for hydrogen and one for oxygen. The system is completed by the storage systems for the two gases. Levelized cost values for green hydrogen are calculated by considering the sale of oxygen either at prices found in the literature in similar studies, or at prices in the European Union for oxygen produced by air distillation, taking into account the operating and investment costs for the compressor and oxygen storage, and comparing the values obtained with the costs of green hydrogen without oxygen valorization
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
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