1,721,012 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
Конгруэнтность дегенеративных изменений, обнаруженных посредством магнитной резонансной томографии и гистологического исследования поясничного межпозвоночного диска
Full text linkCatedra Morfopatologie, USMF N. TestemiţanuSummary.
The lumbar intervertebral disc degeneration is the most
important cause of low back pain. The purpose of the paper
was to highlight the herniated lumbar disc and degenerative
change in patients with clinical accusations by MRI that
pleads for the diagnosis and staging them in relation to
Modic classification and correlative histological examination of the material according to the postoperative lumbar
disc degeneration degree, performed in 173 patients admitted in Vertebrology department of PMSI SCTO January
2008 – December 2009, of which 87 patients were operated
for osteochondrosis with herniated lumbar compression
and spondylolisthesis. The first type of change evidenced by MRI, histopathological, it was demonstrated the recent
forms of the intervertebral disc degeneration, identified in
10 (11.49%) operated patients. The type II changes by MRI,
similar histopathological correspond with two-phase – the
medium forms of the intervertebral disc degeneration,
detected in 32 (36.78%) operated patients. The type III
changes by MRI, histopathological, correspond with the
type three, the advanced forms of the intervertebral disc
degeneration, discovered in 45 cases (51.72%): myxoid
degeneration and intradiscal calcification, discal cartilage
hyalinization with intradiscal calcification areas and the
presence of young cells, fibroblasts, and chondroblasts,
cartilage tissue with areas of fibrosis and chronic inflammatory infiltrate.Резюме.
Дегенеративные процессы в поясничных межпозвонковых дисках являются наиболее важной причиной
болей в пояснице. Целью работы было подчеркнуть
дегенеративные изменения, обнаруженные с помощью
магнитной резонансной томографии на уровне межпозвоночного диска поясничного отдела позвоночника
у этих больных с клиническими жалобами, которые
важны в диагностике грыжи диска. Были произведены стадиализация данных изменений по отношению
к классификации по Модику и корреляционный анализ
результатов гистологического исследования послеоперационного материала в соответствии со степенью
дегенерации диска. Материал набирали от 173 пациентов, поступивших в Республиканскую клиническую
больницу, отделение вертебрологии, в период январь
2008 – декабрь 2009 г., из которых 87 больных были
оперированны с диагнозом «остеохондроз поясничного
отдела с компресивной грыжей» и «спондилолизтез».
В первом типе изменений, обнаруженных с помощью
магнитной резонансной томографии посредством
гистологического исследования, у 10 (11,49 %) оперированных пациентов были выявленыранние формыдегенерации межпозвонкового диска. Второй тип изменений,
обнаруженных с помощью магнитной резонансной томографии после гистопатологического исследования,
соответствовал со второй фазой – средней формой
дегенерации межпозвонкового диска, обнаруженной
у 32 (36,78 %) оперированных больных. Третий тип
изменений после магнитной резонансной томографии
и гистопатологического анализа свидетельствовал о
тяжелой форме дегенерации межпозвонкового диска,
обнаруженной в 45 случаях (51,72 %). Соответсвенно
третьему типу были обнаружены следущие изменения:
миксоидная дегенерация, внутридисковая кальцификация гиалинизированного хряща диска, присутствие
молодых клеток-фибробластов и хондробластов,
хрящевая ткань с зоной фиброза и воспалительным
хроническим инфильтратом
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
Some clinical morphopatological aspects of lumbar intervertebral formations
Full text linkIntroduction: Degenerative-dystrophic damages in human spinal column are quite frequent. In 90%
of the cases they manifest themselves through disorders in peripheral nervous system with growth tendency at young people, capable to work.
According to the latest information from the National Center of Public Health Statistics in the USA,
persons over 45 years old often limit their activities due to pain in the thorax and lumbar part of the vertebral column, and these people constitute about 26-32% of the population of the “second age”.
Structural changes in the tissue in the lumbar area of the vertebral column as a rule become irreversible with time.
Materials and methods: We studied the structure of the intervertebral disc with pathology of the vertebral column in 123 patients, who underwent surgical intervention at the Vertebrology Section of Public Medical Sanitary Institution Traumatology and Orthopedy Hospital in 2009 and compared cadaver
material (lumbar vertebral segments) from 7 cases with different somatic pathologies from the Hospital
„Sfinta Treime”.
Results and discussions: The nucleus pulposus is primarily affected by a series of mechanisms with
disintegration of collagen fibers, fragmentation, loss of liquid, thus forming multiple crevices at the level
of fiber ring, which leads to decrease of their ability to absorb the shocks, and makes them less flexible,
which decreases the disc resistance significantly. One of the ethiopathogenetic factors is circulation disorders of the disc irrigated by the vertebral arteries. In case of senior people, atherosclerosis at advanced
stage intensifies degenerative-dystrophic changes of intervertebral disc.
Conclusions: The results obtained during this study show that normally people at the age of 40-50
years old suffer from discogenic pain, mostly female (55%), most of them accusing of discal hernia at the
level of lumbar area, segment L5.
Histologically 14 patients (16,6%) have incipient forms of degenerescence of intervertebral disc with
aspects of myxoid degenerescence, centrally chondroblastic wtih condrocites, in cases of 70 patients
(83,3%) in medium forms of degenerescence of intervertebral disc the following were detected: fibrosed
tissue, with zones of interfibrilar edema; discal cartilaginous tissue with chondrocytes in chondroblast,
papillary aspect and hemorrhagic zones, hyalinization zones. In case of 39 patients (30,5%), after 51 years
old in advanced forms of intervertebral disc the following were discovered: hyalinized discal cartilage,
intradiscal calcifications or ossification zones, lymphocitar infiltrate
"Life Without the Regulation-The Impact of the EC's Liner Conference Ban- A Shippers' Point of Wiew"
No full textDispelling 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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