1,720,973 research outputs found
AN OVERVIEW OF PNC RELATED STUDIES INVOLVING HEAVY POLAR MOLECULES
No full textAuthor Institution: Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287Parity non-conservation studies (PNC) has given added impetus for both experimental and theoretical determination of the properties of heavy polar molecules. An overview of the current experimental approaches used by various groups in an attempt to the determine the electron electric dipole moment (eEDM), \textit{d_{e}}, and the anapole moment of nuclei will presented. The status of the characterization of the various molecules proposed as venues in PNC will be summarized
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
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
A Comparative Study of Gold Bonding via Electronic Spectroscopy
Get PDFabstract: The bonding and electrostatic properties of gold containing molecules are highly influenced by relativistic effects. To understand this facet on bonding, a series of simple diatomic AuX (X=F, Cl, O and S) molecules, where upon bond formation the Au atom donates or accepts electrons, was investigated and discussed in this thesis.
First, the optical field-free, Stark, and Zeeman spectroscopic studies have been performed on AuF and AuCl. The simple polar bonds between Au and typical halogens (i.e. F and Cl) can be well characterized by the electronic structure studies and the permanent electric dipole moments, el. The spectroscopic parameters have been precisely determined for the [17.7]1, [17.8]0+ and X1+ states of AuF, and the [17.07]1, [17.20]0+ and X1+ states of AuCl. The el have been determined for ground and excited states of AuF and AuCl. The results from the hyperfine analysis and Stark measurement support the assignments that the [17.7]1 and [17.8]0+ states of AuF are the components of a 3 state. Similarly, the analysis demonstrated the [19.07]1 and [19.20]0+ states are the components of the 3 state of AuCl.
Second, my study focused on AuO and AuS because the bonding between gold and sulfur/oxygen is a key component to numerous established and emerging technologies that have applications as far ranging as medical imaging, catalysis, electronics, and material science. The high-resolution spectra were record and analyzed to obtain the geometric and electronic structural data for the ground and excited states. The electric dipole moment, el, and the magnetic dipole moment, m, has been the precisely measured by applying external static electric and magnetic fields. el andm are used to give insight into the unusual complex bonding in these molecules.
In addition to direct studies on the gold-containing molecules, other studies of related molecules are included here as well. These works contain the pure rotation measurement of PtC, the hyperfine and Stark spectroscopic studies of PtF, and the Stark and Zeeman spectroscopic studies of MgH and MgD.
Finally, a perspective discussion and conclusion will summarize the results of AuF, AuCl, AuO, and AuS from this work (bond lengths, dipole moment, etc.). The highly quantitative information derived from this work is the foundation of a chemical description of matter and essential for kinetic energy manipulation via Stark and Zeeman interactions. This data set also establishes a synergism with computation chemists who are developing new methodologies for treating relativistic effects and electron correlation.Dissertation/ThesisDoctoral Dissertation Chemistry 201
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
OPTICAL STARK SPECTROSCOPY OF THE B-XA of CuOH
No full textAuthor Institution: Department of Chemistry and Biochemistry, Arizona State University, Tempe,AZ 85287Copper hydroxide, CuOH, is one of the most thoroughly studied . {\textbf{144}} 286, 1990.} transition metal containing polyatomic molecules with the most recent investigation being the dispersed fluorescence and radiative lifetime study. . {\textbf{449}} 282, 2007.} The pure rotational spectrum was recorded and analyzed by Saitos group some time ago.. {\textbf{112}} 641, 2000.} Recently a high level {\textit{ab initio}} calculation predicted ground state permanent electric dipole moments, , ranging in value from 5.52D to 3.98D depending upon methodology used to treat electron correlation. Here we report on the first molecular beam study of the B-XA band. The spectrum was recorded field-free and in the presence of a static electric field of up to 4000 V/cm. The hyperfine splitting is observed and analyzed for the first time. The determined values are used to evaluate the computational methodologies and are compared with those of other copper containing molecules
OPTICAL STARK SPECTROSCOPY OF NICKLE MONOHYDRIDE, NiH\thanks{Supported by NSF(TCS-ASU).}
No full textJ.A. Gray, S.F. Rice and R.W. Field, J. Chem. Phys., 82,4717 (1985).C.V. Diaconu, A.E. Cho, J.D. Doll and D.L. Freeman, J. Chem. Phys., 121, 10026 (2004).Author Institution: Chemistry and Biochemistry, Arizona State University, Tempe, AZ USA 85287Sometimes ago the MIT group analyzed the Doppler limited optical Stark Spectrum for the -(1,0) (2.5) line of NiH to determine the permanent electric dipole moments, , of 2.40.1 D and 0.30.1 D for the and states, respectively.}\ The ground state value of is routinely predicted to assess the quality of electronic structure predictions.}\ In an effort to reduce the uncertainty in the experimental value of we have analyzed the optical Stark spectrum of the (2.5) and (3.5) of a molecular beam sample. A molecular beam was generated by skimming the output of a laser ablation/supersonic expansion. The dipole moments were determined to be 2.440.02 D and 0.360.02 D for the and states, respectively. The observed trends in the value for the ground state of the first row transition metal monohydrides will be rationalized
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