1,720,961 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
Graphene oxide and reduced graphene oxide synthesis and their surface modification for supercapacitor application
No full textGrafen je sloj ugljika debljine jednog atoma koji posjeduje delokalizirane π elektrone te dobru električnu provodnost što mu, uz veliku specifičnu površinu, otvara mogućnost primjene u elektrokemijskim pretvornicima i spremnicima energija. Fizikalna i kemijska svojstva grafena kao i njegove dimenzije ovise o načinu sinteze. U ovom radu grafen je sintetiziran kemijskim putem koristeći različite forme grafita kao prekursor. Prvi stupanj sinteze se odnosio na dobivanje grafenova oksida (GO) iz kojeg se redukcijom dobiva reducirani grafenov oksid (rGO). Redukcija GO predstavlja vrlo važan korak samog procesa u kojem je neophodno ukloniti niz različitih kisikovih funkcijskih skupina vezanih na grafensku strukturu. Poželjno je provesti redukciju u što većem iskorištenju te osigurati uvjete kod kojih će se spriječiti aglomeracija grafena u grafit. U ovom radu detaljno je proučavan utjecaj konačnog stupnja redukcije na kapacitivna svojstva dobivenog rGO. Također je istraživana mogućnost korištenja ekstrakta lista masline (ELM) i kositrova (II) klorida kao ekološki prihvatljivih reducensa. Strukturne i morfološke karakteristike materijala određene su korištenjem Ramanove spektroskopije, rendgenske fotoelektronske spektroskopije (XPS), rendgenske difrakcijske analize (XRD), infracrvene spektroskopije s Fourierovim transformacijama signala (FTIR), termogravimetrijske analize (TGA) i skenirajuće elektronske mikroskopije (SEM). Iz dobivenih materijala priređeni su superkondenzatori koji su testirani metodom cikličke voltametrije i metodom elektrokemijske impedancijske spektroskopije (EIS). Stabilnost superkondenzatora testirana je punjenjem/pražnjenjem superkondenzatora tijekom 1000 ciklusa kod konstantne struje. Svi priređeni materijali pokazali su dobra kapacitivna svojstva u otopini 0,5 mol dm^-3 Na2SO4. U svrhu poboljšanja kapacitivnih svojstava, GO je modificiran molekulama anilina i o-fenilendiamina. Detaljno su istraženi uvjeti modifikacije te su određena fizikalno-kemijska svojstva dobivenih materijala.Graphene is a monolayer of carbon atoms which possesses delocalized π electrons and a good electrical conductivity. Good electrical conductivity with a large specific surface area opens up the possibility of its application in electrochemical energy storage devices. Physical and chemical properties of graphene as well as its sheet size depend on the synthesis method. In this paper, graphene was chemically synthesized using various graphite forms as precursors. In the first step graphene oxide (GO) was obtained and it was used for further synthesis of reduced graphene oxide (rGO). The reduction of graphene oxide is a crucial step in which it is necessary to remove a variety of oxygen functional groups bonded to the graphene structure. It is desirable to achieve a high degree of reduction and to ensure electron conductivity with preventing the graphene agglomeration. In this paper the influence of the degree of reduction on the capacitive properties of the obtained rGO was studied in details. Additionaly, the possibility of using olive leaf extract (ELM) and tin (II) chloride as ecologically acceptable reducing agents was studied. Structural and morphological characteristics of the obtained materials were determined by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction analysis (XRD), Fouirer-transformed infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). By using cyclic voltammetry and electrochemical impedance spectroscopy (EIS) methods it was shown that the all prepared materials exibited good capacitive properties in 0,5 mol dm^-3 Na2SO4 solution. The prepared materials were used to asemble supercapacitors that were tested by cyclic voltammetry and EIS methods. The stability of the supercapacitors was determined by charging/discharging at constant current during 1000 cycles. In order to improve its capacitive properties, GO is modified by the two different aromatic amines: aniline and o-phenylenediamine. They can contribute to the pseudo-capacitive effects and increase the overall capacitance of the base materials. Modification conditions and physicochemical properties of the obtained materials were studied in details
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
Graphene oxide and reduced graphene oxide synthesis and their surface modification for supercapacitor application
No full textGrafen je sloj ugljika debljine jednog atoma koji posjeduje delokalizirane π elektrone te dobru električnu provodnost što mu, uz veliku specifičnu površinu, otvara mogućnost primjene u elektrokemijskim pretvornicima i spremnicima energija. Fizikalna i kemijska svojstva grafena kao i njegove dimenzije ovise o načinu sinteze. U ovom radu grafen je sintetiziran kemijskim putem koristeći različite forme grafita kao prekursor. Prvi stupanj sinteze se odnosio na dobivanje grafenova oksida (GO) iz kojeg se redukcijom dobiva reducirani grafenov oksid (rGO). Redukcija GO predstavlja vrlo važan korak samog procesa u kojem je neophodno ukloniti niz različitih kisikovih funkcijskih skupina vezanih na grafensku strukturu. Poželjno je provesti redukciju u što većem iskorištenju te osigurati uvjete kod kojih će se spriječiti aglomeracija grafena u grafit. U ovom radu detaljno je proučavan utjecaj konačnog stupnja redukcije na kapacitivna svojstva dobivenog rGO. Također je istraživana mogućnost korištenja ekstrakta lista masline (ELM) i kositrova (II) klorida kao ekološki prihvatljivih reducensa. Strukturne i morfološke karakteristike materijala određene su korištenjem Ramanove spektroskopije, rendgenske fotoelektronske spektroskopije (XPS), rendgenske difrakcijske analize (XRD), infracrvene spektroskopije s Fourierovim transformacijama signala (FTIR), termogravimetrijske analize (TGA) i skenirajuće elektronske mikroskopije (SEM). Iz dobivenih materijala priređeni su superkondenzatori koji su testirani metodom cikličke voltametrije i metodom elektrokemijske impedancijske spektroskopije (EIS). Stabilnost superkondenzatora testirana je punjenjem/pražnjenjem superkondenzatora tijekom 1000 ciklusa kod konstantne struje. Svi priređeni materijali pokazali su dobra kapacitivna svojstva u otopini 0,5 mol dm^-3 Na2SO4. U svrhu poboljšanja kapacitivnih svojstava, GO je modificiran molekulama anilina i o-fenilendiamina. Detaljno su istraženi uvjeti modifikacije te su određena fizikalno-kemijska svojstva dobivenih materijala.Graphene is a monolayer of carbon atoms which possesses delocalized π electrons and a good electrical conductivity. Good electrical conductivity with a large specific surface area opens up the possibility of its application in electrochemical energy storage devices. Physical and chemical properties of graphene as well as its sheet size depend on the synthesis method. In this paper, graphene was chemically synthesized using various graphite forms as precursors. In the first step graphene oxide (GO) was obtained and it was used for further synthesis of reduced graphene oxide (rGO). The reduction of graphene oxide is a crucial step in which it is necessary to remove a variety of oxygen functional groups bonded to the graphene structure. It is desirable to achieve a high degree of reduction and to ensure electron conductivity with preventing the graphene agglomeration. In this paper the influence of the degree of reduction on the capacitive properties of the obtained rGO was studied in details. Additionaly, the possibility of using olive leaf extract (ELM) and tin (II) chloride as ecologically acceptable reducing agents was studied. Structural and morphological characteristics of the obtained materials were determined by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction analysis (XRD), Fouirer-transformed infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). By using cyclic voltammetry and electrochemical impedance spectroscopy (EIS) methods it was shown that the all prepared materials exibited good capacitive properties in 0,5 mol dm^-3 Na2SO4 solution. The prepared materials were used to asemble supercapacitors that were tested by cyclic voltammetry and EIS methods. The stability of the supercapacitors was determined by charging/discharging at constant current during 1000 cycles. In order to improve its capacitive properties, GO is modified by the two different aromatic amines: aniline and o-phenylenediamine. They can contribute to the pseudo-capacitive effects and increase the overall capacitance of the base materials. Modification conditions and physicochemical properties of the obtained materials were studied in details
Graphene oxide and reduced graphene oxide synthesis and their surface modification for supercapacitor application
No full textGrafen je sloj ugljika debljine jednog atoma koji posjeduje delokalizirane π elektrone te dobru električnu provodnost što mu, uz veliku specifičnu površinu, otvara mogućnost primjene u elektrokemijskim pretvornicima i spremnicima energija. Fizikalna i kemijska svojstva grafena kao i njegove dimenzije ovise o načinu sinteze. U ovom radu grafen je sintetiziran kemijskim putem koristeći različite forme grafita kao prekursor. Prvi stupanj sinteze se odnosio na dobivanje grafenova oksida (GO) iz kojeg se redukcijom dobiva reducirani grafenov oksid (rGO). Redukcija GO predstavlja vrlo važan korak samog procesa u kojem je neophodno ukloniti niz različitih kisikovih funkcijskih skupina vezanih na grafensku strukturu. Poželjno je provesti redukciju u što većem iskorištenju te osigurati uvjete kod kojih će se spriječiti aglomeracija grafena u grafit. U ovom radu detaljno je proučavan utjecaj konačnog stupnja redukcije na kapacitivna svojstva dobivenog rGO. Također je istraživana mogućnost korištenja ekstrakta lista masline (ELM) i kositrova (II) klorida kao ekološki prihvatljivih reducensa. Strukturne i morfološke karakteristike materijala određene su korištenjem Ramanove spektroskopije, rendgenske fotoelektronske spektroskopije (XPS), rendgenske difrakcijske analize (XRD), infracrvene spektroskopije s Fourierovim transformacijama signala (FTIR), termogravimetrijske analize (TGA) i skenirajuće elektronske mikroskopije (SEM). Iz dobivenih materijala priređeni su superkondenzatori koji su testirani metodom cikličke voltametrije i metodom elektrokemijske impedancijske spektroskopije (EIS). Stabilnost superkondenzatora testirana je punjenjem/pražnjenjem superkondenzatora tijekom 1000 ciklusa kod konstantne struje. Svi priređeni materijali pokazali su dobra kapacitivna svojstva u otopini 0,5 mol dm^-3 Na2SO4. U svrhu poboljšanja kapacitivnih svojstava, GO je modificiran molekulama anilina i o-fenilendiamina. Detaljno su istraženi uvjeti modifikacije te su određena fizikalno-kemijska svojstva dobivenih materijala.Graphene is a monolayer of carbon atoms which possesses delocalized π electrons and a good electrical conductivity. Good electrical conductivity with a large specific surface area opens up the possibility of its application in electrochemical energy storage devices. Physical and chemical properties of graphene as well as its sheet size depend on the synthesis method. In this paper, graphene was chemically synthesized using various graphite forms as precursors. In the first step graphene oxide (GO) was obtained and it was used for further synthesis of reduced graphene oxide (rGO). The reduction of graphene oxide is a crucial step in which it is necessary to remove a variety of oxygen functional groups bonded to the graphene structure. It is desirable to achieve a high degree of reduction and to ensure electron conductivity with preventing the graphene agglomeration. In this paper the influence of the degree of reduction on the capacitive properties of the obtained rGO was studied in details. Additionaly, the possibility of using olive leaf extract (ELM) and tin (II) chloride as ecologically acceptable reducing agents was studied. Structural and morphological characteristics of the obtained materials were determined by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction analysis (XRD), Fouirer-transformed infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). By using cyclic voltammetry and electrochemical impedance spectroscopy (EIS) methods it was shown that the all prepared materials exibited good capacitive properties in 0,5 mol dm^-3 Na2SO4 solution. The prepared materials were used to asemble supercapacitors that were tested by cyclic voltammetry and EIS methods. The stability of the supercapacitors was determined by charging/discharging at constant current during 1000 cycles. In order to improve its capacitive properties, GO is modified by the two different aromatic amines: aniline and o-phenylenediamine. They can contribute to the pseudo-capacitive effects and increase the overall capacitance of the base materials. Modification conditions and physicochemical properties of the obtained materials were studied in details
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
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