1,720,955 research outputs found
Single Gaussian distribution of barrier height in Al/PS-ZnPc/p-Si type Schottky barrier diode in temperature range of 120-320 K
No full textWOS: 000342157500030Possible current-transport mechanism in aluminum/polystrene-zincphthalocyanine/ptype silicon Schotky barrier diode (Al/PS-ZnPc/p-Si; SBD), for the forward bias current-voltage (I-V) characteristics were carried out in the temperature range of 120-320 K. The high value of ideality factor (n), especially at low temperatures, was attributed to the existence of PS layer, barrier in-homogeneities and particular density distribution of surface states between metal and semiconductor. An abnormal decrease in the zero-bias barrier height (BH) and increase in n with decreasing temperature which leads to non-linearity in the Richardson plot, have been observed. Linear relationship between BH and n was also observed. BH was plotted as a function of q/2kT to obtain evidence of Gaussian distribution (GD) of the BHs. The mean BH and its standard deviation (sigma) were obtained as 1.03 eV and 0.117 V from the slope and intercept of this plot, respectively. Thus, the modified ln(Io/T-2) - q(2)sigma o(2)/2k(2)T(2) versus q/kT plot gives mean BH and the modified Richardson constant as 1.043 eV and 29.824 A cm(-2) K-2, respectively. This value of the Richardson constant is very close to the theoretical value of 32 A cm(-2) K-2 for p-type Si. Therefore, non-ideal behavior of forward-bias I-V characteristics in Al/PS-ZnPc/p-Si might be successfully explained in terms of the thermionic emission mechanism with single GD of BHs.scientific research unit of Amasya University [FMB-BAP-13-038, FMB-BAP-13-059]Authors want to express their great acknowledges to the scientific research unit of Amasya University for the financial support to this study with Grant Numbers of FMB-BAP-13-038 and FMB-BAP-13-059, and executives of Amasya University Central Research Laboratory for their kind understanding of using their facilities
The source of negative capacitance and anomalous peak in the forward bias capacitance-voltage in Cr/p-si Schottky barrier diodes (SBDs)
Full text linkThe frequency and voltage dependence of capacitance voltage (C-V) and conductance-voltage (G/w-V) characteristics of the Cr/p-Si metal semiconductor (MS) Schottky barrier diodes (SBDs) were investigated in the frequency and applied bias voltage ranges of 10 kHz to 5 MHz and (-4 V)-(+4 V), respectively, at room temperature. The effects of series resistance (R-S) and density distribution of interface states (N-SS), both on C-V and G/w-V characteristics were examined in detail. It was found that capacitance and conductance, both, are strong functions of frequency and applied bias voltage. In addition, both a strong negative capacitance (NC) and an anomalous peak behavior were observed in the forward bias C-V plots for each frequency. Contrary to the behavior of capacitance, conductance increased with the increasing applied bias voltage and there happened a rapid increase in conductance in the accumulation region for each frequency. The extra-large NC in SBD is a result of the existence of R-S, N-SS and interfacial layer (native or deposited). In addition, to explain the NC behavior in the forward bias region, we drew the C-I and G/w-I plots for various frequencies at the same bias voltage. The values of C decrease with increasing frequency at forward bias voltages and this decrease in the NC corresponds to an increase in conductance. The values of N-SS were obtained using a Hill-Coleman method for each frequency and it exhibited a peak behavior at about 30 kHz. The voltage dependent profile of R-S was also obtained using a Nicollian and Brews methods. (C) 2015 Elsevier Ltd. All rights reserved.TUBITAK; Scientific Research Projects Unit of Nigde University BAP research project [2012/022]One of the authors (Cigdem BILKAN) thanks TUBITAK for financial support.r Second of the authors (Ahmet GUMUS) This work is supported by the Scientific Research Projects Unit of Nigde University BAP research project with 2012/022 number
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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