1,720,962 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
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
Changes in microbial community structure and functional diversity under salinization of a coastal lake
No full textJezerski sustavi u područjima oskudnim vodom, poput Mediterana, su od iznimne važnosti za razvoj lokalnog gospodarstva, često imajući ulogu glavnog vodnog resursa. Vransko jezero kod Biograda na moru je obalno plitko jezero čiji vodni režim ovisi o precipitacijsko-evaporacijskoj ravnoteži. Ovo jezero ostvaruje komunikaciju s Jadranskim morem preko djelomično okršenog karbonatnog grebena i kanala Prosika. Prostorno-vremenskim istraživanjem mikrobne zajednice jezera pomoću visoko-protočne metode sekvenciranja mikrobne DNA istražen je utjecaj zaslanjenja na raznolikost i funkcije mikrobnih zajednica Vranskog jezera. Tijekom sušnih razdoblja, u jezeru se bilježe periodični prodori morske vode koji su se pokazali da utječu na promjene unutar autohtonih mikrobnih zajednica te time mijenjaju strukturu zajednice i potencijalne metaboličke procese od iznimne važnosti za funkciju ekosustava. Mikrobne zajednice, otopljena organska tvar i biogeni ciklus metana mijenjali su se pod utjecajem nekoliko okolišnih pritisaka, uključujući sušu, zaslanjenje i pljuskove. Ova disertacija doprinosi istraživanju utjecaja globalnih klimatskih promjena na obalne vodne resurse.Lake systems in the freshwater-scarce Mediterranean region play a crucial role in the local economy by frequently acting as primary water resources. Lake Vrana is a shallow coastal lake that depends on the balance of precipitation and evaporation and is connected to the Adriatic Sea by the semi-karstified carbonate ridge and the Prosika canal. By investigating the spatio-temporal distribution of microbial communities in the lake using high-throughput sequencing of microbial DNA, it was possible to study the impact of salinization on microbial diversity and function. During periods of drought, seawater intrusions occur in the lake, which have been shown to affect autochthonous microbial communities and lead to changes in microbial structures and potential metabolisms vital for the functioning of the lake. Microbial communities, DOM structure, and biogenic methane cycling were driven by multiple environmental stressors, including drought, salinization and heavy rainfall events. Studying changes in the microbial communities of Lake Vrana could help interpret the effects of global climate change on coastal water resources
Biological and ecological characteristics of freshwater mussel Unio crassus Philipsson, 1788
Full text linkUnio crassus, vrsta je ugroženog europskog slatkovodnog školjkaša. Organizam je zaštićen školjkom, hrani se filtracijom i živi u čistim potocima i rijekama sitnijeg sedimenta. Odvojena je spola te se oplodnja događa u tijelu ženke. Unutar sezone parenja ženke pokazuju jedinstveni način rasprostiranja ličinki. Od potpunog razvoja mlade jedinke dijele dvije etape: stadij parazitske ličinke i stadij juvenilne detritovorne jedinke. Brojnost vrste veoma ovisi o stopi učinkovitosti pri pronalaženju odgovarajućeg domaćina ličinke glohidije i o kemijskim uvjetima u supstratu na koje je juvenilni stadij izrazito osjetljiv. Povećanjem naseljenosti i industrijske aktivnosti mnoga njegova staništa su uništena te se zbog toga provode različiti projekti restauracije staništa, reintrodukcije i monitoringa vrste kao i obrazovanja lokalnog stanovništva.Unio crassus is endangered European freshwater mussel. Their body is protected by a shell, they feed by filtration and live in clean streams and rivers with finer sediment. They are separate sexes and fertilization occurs in the body of the female. Within the breeding season the females show a unique way of spreading larvae. There are two stages between an egg and young individual: parasitic larval stage and juvenile detritovores. The number of species is highly dependent on the rate of efficiency in finding suitable host in larval stage and the chemical conditions in the substrate on which the juvenile stage is extremely sensitive. Because of increasing population and industrial activities, many of its habitats are destroyed and can therefore carry out various projects of restoration of habitats, species reintroduction and monitoring as well as the education of the local population
Monitoring of environmental parameters in a tourist cave - case study of Barac's caves near Rakovica
Full text linkŠpilje su krški reljefni oblici koji mogu na nesvakidašnji način pružiti edukaciju o prirodnim procesima. Špiljski turizam svojom jedinstvenošću privlači sve širu publiku. Kako bi se moglo održivo upravljati takvim sustavom potrebno je poznavati njegove karakteristike te vršiti monitoring nad osnovnim mikroklimatskim parametrima. Gornja Baraćeva špilja je turistička špilja u Rakovici. Dio je kompleksa od četiri špilje od kojih je jedna aktivni provodnik te završava kao izvor Baraćevac. U Gornjoj Baraćevoj špilji praćeni mikroklimatski parametri bili su temperatura zraka, relativna vlaga i koncentracija ugljikova dioksida. Rezultati temperature zraka i relativne vlažnosti pokazuju da se radi o špilji s vrlo stabilnim vrijednostima koja ne osciliraju. Koncentracija ugljikova dioksida ima zabilježene promjene povezane s vegetacijskom sezonom. Uz mikroklimatske uvjete praćeni su sljedeći fizikalno-kemijski parametri vode prokapnice i izvorišne vode: temperatura, pH, alkalinitet, koncentracija otopljenog kisika, nitrata i ortofosfata. Dobivene vrijednosti pokazuju utjecaj vapnenačke podloge i odgovaraju stabilnim mikroklimatskim okolišnim uvjetima. Pod svjetlosnim snopom rasvjetnih tijela razvija se lampenflora. Kako bi se o njoj prikupile dodatne informacije iz uzoraka lampenflore determinirano je 24 vrste dijatomeja (Bacillariophyceae). Dominantne vrste su aerofilne i kozmopolitski rasprostranjene, a najbrojnija je Diadesmis contenta. U svrhu procjene ekološkog stanja izvora Baraćevac determinirano je 29 vrsta dijatomeja od kojih su dominantne Achnanthidium minutissimum i Cocconeis placentula. Ekološko stanje izvora Baraćevac procijenjeno je na temelju saprobnog (SIHRIS) i trofičkog indeksa dijatomeja (TIDRH) te je procijenjeno kao vrlo dobro u travnju i dobro u srpnju.The caves are karst relief forms that can in an unequal way provide education on natural processes. With its uniqueness caving tourism attracts wide audience. In order to be able to manage such a system, it is necessary to know its characteristics and to monitor the basic microclimate parameters. Upper Barac's cave is a tourist cave in Rakovica. It is part of a complex of four caves, one of which ends with a spring called Baracevac. The microclimatic parameters observed in Upper Barac's cave were air temperature, relative humidity and carbon dioxide concentrations. The results of air temperature and relative humidity show very stable values with no oscillation. Carbon dioxide concentrations have recorded changes associated with the vegetation season. In addition to microclimatic conditions, the following physico-chemical parameters of drip water and spring water are monitored: temperature, pH, alkalinity, dissolved oxygen concentration, nitrate and orthophosphate concentration. The results show the impact of the limestone substrate and correspond to stable microclimatic conditions. Lamp flora is developed due to lighting fixtures. In order to collect additional information from lamp flora samples, 24 diatom species (Bacillariophyceae) were determined. Dominant species are aerophilic and cosmopolites. The most frequent is Diadesmis contenta. In order to estimate the ecological status of the Baracevac spring, 29 diatom species were determined. The dominant species were Achnanthidium minutissimum and Cocconeis placentula. The ecological status was estimated by using Saprobic Index (SIHRIS) and Trophic Diatom Index (TIDRH). Ecological status was estimated as high (oligotrophic to oligo-mesotrophic) in April and as moderate (mesotrophic to meso-eutrophic) in July
- …
