1,720,954 research outputs found
Fundamental chemical kinetics : an explanatory introduction to the concepts /
No full textThe unusual approach of this text gives final honours and post-graduate students a clear and explanatory account of one of the "harderi areas of physical chemistry. The author takes care to provide detailed verbal clarification of the concepts and their importance together with full explanations of the mathematical developments. Her explanations are an essential and vital feature of the text, which is scholarly, lucid and well-written with a combination of depth of coverage and clarity which helps students to work through on their own. A clear and explanatory account of one of the more difficult areas of physical chemistryProvides detailed verbal clarification of the concepts and their importance together with full explanations of the mathematical developmentsDiscusses energy transfer, molecular beam studies of reactive scattering and historical developments and modern kinetics, among other topics.Includes index.Print version record.The unusual approach of this text gives final honours and post-graduate students a clear and explanatory account of one of the "harderi areas of physical chemistry. The author takes care to provide detailed verbal clarification of the concepts and their importance together with full explanations of the mathematical developments. Her explanations are an essential and vital feature of the text, which is scholarly, lucid and well-written with a combination of depth of coverage and clarity which helps students to work through on their own. A clear and explanatory account of one of the more difficult areas of physical chemistryProvides detailed verbal clarification of the concepts and their importance together with full explanations of the mathematical developmentsDiscusses energy transfer, molecular beam studies of reactive scattering and historical developments and modern kinetics, among other topics.Front Cover; Fundamental Chemical Kinetics: An Explanatory Introduction to the Concepts; About the Author; Fundamental Chemical Kinetics: An Explanatory Introduction to the Concepts; Copyright Page; Dedication; Preface; Acknowledgements; Table of Contents; Chapter 1. Introduction: Historical Developments and Modern Kinetics; 1.1 A historical development of concepts in kinetics; 1.2 Concepts involved in modem state to state kinetics; 1.3 Collision processes and a master mechanism describing elementary reactions at the microscopic level1.4 Kinetics of uni-, bi-, and termolecular reactions using the master mechanism1.5 A generalisation of these ideas; Chapter 2. Basic Transition State Theory; 2.2 Properties of the potential energy surface relevant to transition state theory: Figure 2.1; 2.3 Major Assumptions of Transition State Theory; 2.4 Derivation of the rate of reaction; 2.5 Approximate calculations; 2.6 Thermodynamic formulations of transition state theory; Chapter 3. Advanced Transition State Theory; 3.1 The assumptions of transition state theory reassessed; 3.2 Symmetry Numbers and Statistical Factors3.3 Advances in transition state theory3.4 Quantum Transition State Theory; Chapter 4. Basic Unimolecular Theory; 4.1 Experimental observations and manipulation of experimental data; 4.2 Significance and physical interpretation of the three rate constants in the general mechanism; 4.4 Aspects of vibrations used in unimolecular theory; 4.5 Mathematical tools used in unimolecular theory; 4.6 Uoimolecular theories; 4.7 The simple Lindemann treatment; 4.8 Hinshelwood's Theory; 4.9 Kassel's Theory; 4.10 Kassel's Quantum Theory; Chapter 5. Advanced Unimolecular Theory5.1 Marcus' theory, or Rice, Ramsperger, Kassel, Marcus (RRKM) theory5.2 Adiabatic channel theory: Quack and Troe; 5.3 Slater's theory; Chapter 6. Potential Energy Surfaces; 6.1 Quantum ab initio calculations; 6.2 Semi-empirical calculations; 6.3 Potential energy contour diagrams and profiles; 6.4 Molecular dynamics; 6.5 Trajectory calculations; 6.6 Testing of predictions of transition state theory; 6.7 Reaction in terms of mass type; 6.8 Exothermic and endothermic reactions; 6.9 More detailed aspects of the features of different types of potential energy barriers6.10 General features of attractive potential energy surfaces for exothermic reactions6.11 General features of repulsive energy surfaces for exothermic reactions; 6.12 General features of repulsive potential energy surfaces where the attacking atom is light; 6.13 General features of repulsive potential energy surfaces for exothermic reactions where the attacking atom is heavy; 6.14 Other mass type reactions; 6.15 Less extreme barriers; 6.16 Typical reactions for which a correlation of potential energy surfaces and trajectory calculations has been made with molecular beam experimentsElsevie
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
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