1,721,070 research outputs found
Perspectives of environmental protection in nursery production through the use of environmentally acceptable substrates
No full textTresetišta predstavljaju jedinstvene ekosisteme bogate ugljenikom,
rasprostranjene skoro u svim zemljama na planeti i kao takvi čine najveća skladišta
ugljenika na kopnu. Nastanak treseta vezuje se za akumulaciju organske materije pri
anaerobnim uslovima, što ova staništa čini jednim od najosetljivijih ekosistema na klimatske
promene. Ovakvi ekosistemi su važan faktor za ublažavanje prirodnih nepogoda, fi ltriranje i
skladištenje vode. Ujedno, treset formira supstrat pogodnih fi zičkih i hemijskih karakteristika
što predstavlja glavni razlog upotrebe kao tradicionalnog supstrata za gajenje biljaka u
rasadničkoj proizvodnji. Posledice degradacije tresetnih ekosistema i klimatske promene
ukazuju da je pronalazak održivih rešenja za korišćenje treseta u hortikulturi od globalnog
značaja za očuvanje biodiverziteta ovakvih staništa. Cilj rada je pronalaženje supstrata
koji bi uspešno zamenio upotrebu treseta u proizvodnji Hydrangea macrophylla i doprineo
razvoju održive rasadničke proizvodnje. U pejzažnoj arhitekturi velikolisna hortenzija se
koristi za ornamentalne svrhe, ali ima veliki potencijal za remedijaciju zemljišta i adaptibilna
je na abiotičke uslove. Ogled je sproveden u rasadniku Šumarskog fakulteta, činilo ga je 9
tretmana vrste Hydrangea macrophylla. Alternativni supstrati 2 (treset 30%, borova kora
50%, humus 10%, glistenjak 10%) i 3 (kompostni supstrat 50%, borova kora 30%, pesak
10%, vermikulit 10%) pokazali su se kao najbolja zamena za treset, iako su zabeleženi
nedostaci u razvoju korenovog sistema. Rezultat ukazuje na mogućnost dobijanja ekološki
prihvatljivog rešenja za gajenje hortenzije, što je od izuzetne važnosti za smanjenje upotrebe
treseta u hortikulturi i očuvanje vlažnih staništa u regionu
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
Taxonomic and ecological investigation of Vaccinium L. genus in Serbia
No full textVrste roda Vaccinium su listopadni ili zimzeleni žbunovi ili polužbunovi koje se svrstavaju u familiju Ericaceae. Široko su rasprostranjene u planinskim regionima centralne Evrope, kao i u borealnim i sub-arktičkim regionima severne Evrope, posebno u prizemnom spratu četinarskih šuma. Na područje Srbije u brdskim i planinskim regionima nalaze se tri vrste ovog roda: V. myrtillus, V. uliginosum i V. vitis-idaea. Ove vrste su dugoživeće, njihova reproduktivna strategija obuhvata i vegetativno i generativno razmnožavanje, njihove cvetove oprašuju insekti ili su samooplodne, a semena raznose ptice. Rezultati dobijeni morfo-anatomskim istraživanjima odabranih karaktera listova proučavanih vrsta statistički su obrađeni korišćenjem programa “Statistica” (StatSoft, Inc., Tulsa, OK, USA). Na osnovu analiziranik morfo-anatomskih karaktera listova, utvrđena je jasna diferencijacija između proučavanih vrsta, dok se diferencijacija između populacija u okviru iste vrste ne uočava. Varijabilnost proučavanih morfo – anatomskih karakteristika listova dovedena je u vezu sa određenim ekološkim faktorima. Klaster analizom morfo- anatomskih karakteristika listova ukazala je na mogućnost postojanje genetičke varijabilnosti između populacija, što je potvrđeno molekularno – genetičkim istraživanjima. Za potrebe molekularno-genetičkih istraživanja, DNK je izolovana iz mladih listova proučavanih vrsta. Za proučavanje genetičkog diverziteta i varijabilnosti korišćeni su RAPD markeri. Obrada podataka vršena je upotrebom nekoliko softvera: POPGENE, PAST, NTSYSpc, Arlequin i STRUCTURE 2.2...The species of the Vaccinium genus include deciduous or evergreen shrubs which belong to the family Ericaceae. They are widespread in the mountainous regions of central Europe and in the boreal and sub-arctic regions of northern Europe, particularly on the ground floor of coniferous forests. In the hilly and mountainous regions on the territory of Serbia, three species of this genus are described: V. myrtillus, V. uliginosum and V. vitis-idaea. These species are longlived, their reproductive strategy includes vegetative and generative reproduction, their flowers are pollinated by insects, they can also be selfpollinated, and their seeds are dispersed by birds. The results obtained by morpho-anatomical investigation of leaves were statistically analyzed using the program “Statistica” (StatSoft, Inc., Tulsa, OK, USA). Based on the analysis of the morpho-anatomical character of leaves, a clear differentiation between the investigated species was noticed, while the differentiation between the populations within the same species was not observed. The variability of the studied morpho - anatomical leaf characteristics were correlated with certain environmental factors. The cluster analysis of morpho-anatomical leaf characteristics indicated the possibility of the existence of genetic variation among the populations, which was confirmed by molecular - genetic research. For the purposes of molecular genetic studies, DNA was extracted from young leaves of the studied species. For the study of genetic diversity and variability RAPD markers were used. Data analysis was performed using several kinds of software: POPGENE, PAST, NTSYSpc, Arlequin and STRUCTURE 2.2..
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
Autohtone zeljaste vrste kao alternativa invazivnim biljkama
No full textIntrodukcija i širenje invazivnih bilјaka prepoznati su kao jedan
od glavnih faktora koji utiču na gubitak biodiverziteta. Pored
negativnog uticaja, koje invazivne bilјke imaju na biodiverzitet, njihov
negativan uticaj ispolјava se i na zdravlјe lјudi i ekonomiju.
Introdukcija invazivnih bilјaka može da bude slučajna i namerna, a
vrši se na različite načine. Uvoz alohtonih bilјaka koje vrše
rasadničari predstavlјa jedan od načina namerne introdukcije
invazivnih bilјaka. U rasadnicima se delovi uvezenih bilјaka koriste
za vegetativno i generativno razmnožavanje, a zatim se uvezen
materijal, a kasnije i onaj dobijen razmnožavanjem prodaje. Ove
bilјke se zatim koriste za uređenje različitih javnih zelenih površina,
ali i privatnih vrtova, okućnica itd. Veliki broj tih vrsta se „otrgao“
kontroli i započeo širenje na nova poluprirodna i prirodna staništa na
kojima je došlo do smanjenja autohtonog florističkog diverziteta.
Prema istraživanjima koja su sprovedena u nekim evropskim
zemlјama, visok procenat invazivnih vrsta koje su okarakterisane
kao agresivne invazivne vrste jesu zapravo vrste koje su uvezene
kao dekorativne (AlterIAS). Imajući u vidu ovu činjenicu jasno je da
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rasadnička proizvodnja, odnosno sektor proizvodnje ukrasnog
bilјnog materijala, ima značajnu ulogu u prevenciji širenja invazivnih
bilјaka. Iz tog razloga u mnogim zemlјama, u okviru sektora za
proizvodnju ukrasnog bilјnog materijala, radi se na projektima koji za
cilј imaju podizanje svesti o negativnim uticajima introdukcije
invazivnih bilјaka. Jedan od načina da se prevenira širenje
invazivnih bilјaka jeste proizvodnja autohtonih vrsta u rasadnicima
koje bi se koristile u pejzažnom dizajnu.
Cilј rada je da se ukaže na značaj i mogućnost korišćenja
autohtonih zelјastih vrsta bilјaka u pejzažnom dizajnu, kao
alternativa invazivnim bilјkama
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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