1,720,995 research outputs found
Complete Set of Enthalpy Recovery Data Using Flash DSC: Experiment and Modeling
No full textEnthalpy recovery of a single polystyrene thin film is quantified by both experiments using Flash DSC and mode- ling using a new modified TNM model. Experimental data include Kovacs’ three signatures of structural recovery: intrinsic isotherms after temperature down jumps, the asymmetry of approach after temperature down and up jumps of the same size, and the mem- ory effect after a two-step history. A new modified TNM model is proposed to quantitatively fit all three signatures of structural recovery with a single set of model parameters. Here, we eluci- date the detailed derivation of the new modified model and dem- onstrate its applicability to the experimental Flash DSC result
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
Glass transition and crystallization of amorphous pharmaceuticals: Time-temperature-transformation diagram and crystallization suppression
No full textAmorphous pharmaceutical keep gaining attention as a novel technology in pharmaceutical formulation field. Compared to their crystalline counterpart, amorphous pharmaceuticals is of a higher water solubility and better dissolution behavior, which make it an important and promising technology targeting to improve the bioavailability of the poor aqueous soluble crystal pharmaceutical. However, one problem is that the physical instability of amorphous pharmaceutical usually lead to a high tendency to crystallize. To better understand this glass-crystal phase transformation, it is necessary to understand the basic physical of glass material and the crystallization kinetics. The goal of my PhD projects it to study the correlation between the glassy dynamics and the crystallization tendency, also study the isothermal crystallization kinetics from amorphous state. Besides, the nanoscale confinement is also applied to the amorphous API to study the glass dynamic change impact on crystallization. In this works, the amorphous API will be studied from a material physics perspective and bring in the idea of time-temperature transformation diagram to study the phase transformation phenomena od crystallization.
The first part of the dissertation is Chapter 1 and 2, where a more detailed description of the projects is given, illustrate the importance of this work and the objective and purpose. In Chapter 2, the background information related to following project and chapter is also given. The second part is the technical part, that focused on the research project I did during my PhD study. In chapter 3, The impact of nanoconfinement on the crystallization and glass transition behaviors of nifedipine (NIF) has been investigated using differential scanning calorimetry, and glass transition, crystallization and melting behavior was compared with different size confinement and also with the bulk sample. In Chapter 4 and 5, two different pharmaceuticals GDC0276 and nifedipine was prepared into amorphous state, and later the amorphous API were employed to study the isothermal crystallization by rheometer and DSC. The time-temperature-transformation diagram is constructed for both amorphous API, and a modified model was also applied to describe the kinetic of crystallization. For the NIF, during the isothermal crystallization, a interesting polymorph formation is also observed. In the Chapter 6, as an extended work of Chapter 4 and 5, the model is employed to predicted the TTT diagram for 28 different API, and results is compared with material that of different glass forming ability and stability. The final part of this dissertation including Chapter 7 and Chapter 8, and a summary is given in Chapter 7, in Chapter, the author discussed couple future works extended from the current project, that could be interested to investigate
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
