1,720,963 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
Effect of Saline and Non-Specific Insulin Binding on the Phase Behavior of Poly (Ethylene Glycol)-Grafted Phosphoethanolamine-Succinyl Model Membranes
Get PDFPoly (ethylene glycol)-grafted membrane-mimetic surfaces bearing negatively charged phospholipid headgroups have gained significant attention due to their promising contributions in numerous biomedical applications. The conformational properties of PEG chains have been mainly studied at the air/water interface, which does not elucidate much about its behavior at the physiological pH ~ 7.4. In this contribution, binary mixtures of a phosphoethanolamine-Succinyl bearing C16 aliphatic chains, DPPE-Succinyl, and a PEG-phospholipid conjugate bearing a PEG chain of 2000 Da, DPPE-PEG2000, have been used as ideal models of bio-nonfouling membrane-mimetic surfaces. The effect of PBS with pH ~7.4 as well as each of its individual constituents including Na2HPO4, KCl, KH2PO4, and NaCl on the biophysical properties of model membrane was examined. Our findings suggest that saline and each of its individual constituents play a pivotal role in the phase and conformational behavior of PEG-grafted membrane models. Insulin as a model protein was then selected to further investigate the effect of phase and conformation behavior of PEG-grafted membrane models on protein/membrane interactions. The insulin/membrane interactions were quantified in terms of monolayer area expansion, ΔA, penetration area, Ap, as well as protein binding degree, χp. To the best of our knowledge, this study provides the first insight into mechanistic aspects of protein interactions with model negatively charged PEG-grafted membranes. This knowledge, may aid in understanding the in-vivo performance of advanced targeted therapeutic carriers
The effect of sustainable human resource management and emotional Intelligence on job performance of secondary school teachers: a mediation of psychological ownership
No full textThe public education sector, specifically in developing countries like Pakistan, has a serious problem of teacher‘s job performance with limited resources, lack of research, and evidence-based administrative interventions. This study aims to investigate the effect of sustainable HRM and emotional intelligence (EI) on teachers‘ job performance (TJP). This study also aims to investigate the mediating effect of psychological ownership (PO)
on the relationship between sustainable HRM and EI towards TJP in the public secondary school of Punjab Pakistan. Psychological Possession Theory (PPT) and Organizational Support Theory‘s (OST) assumptions were tested for the effect of sustainable HRM and EI on TJP through the mediation effect of PO. The sustainable
HRM was measured using employability (EP), sense of personal responsibility (PR), work-life balance (WLB), and training (T), while all other variables were measured unidimensionally. The response was gathered by a self-administered survey based on stratified proportionate random sampling among secondary school teachers in 36 districts of Punjab Pakistan. The collected data were analyzed using the structural equation model (SEM) technique in Smart PLS. The results of PLS-SEM path modeling analysis for a sample of 451 secondary school teachers revealed that two out of four dimensions of sustainable HRM (EP and T) have a positive effect on TJP, while PR and WLB has an insignificant association with the TJP. Moreover, EI is negatively associated with TJP. Besides, three out of four dimensions of sustainable HRM namely PR, WLB, and T are
positively associated with PO, while EP is negatively associated with PO. Further, EI is positively associated with PO. The study also shows that PO as positively affecting TJP. Finally, PO serving as a mediator in the relationship between three dimensions of sustainable HRM (PR, WLB, and T) and EI with TJP. Based on the findings of this study, the education department could focus on teachers‘ sustainability which further developed the PO, which in return enhance TJP. Most importantly, the school education
department should focus on increasing the level of PO as to boost the TJP. Finally, the theoretical and practical contributions, as well as limitations and recommendations for future research are also discussed in this thesis
Linear Sigma Models in QCD and S3 Symmetry for Neutrinos
Get PDFThis thesis has two parts with different topics in particle physics. In part I, we consider various linear sigma models and their applications to scalar mesons. It is shown that the tree amplitude for ππ scattering in the minimal linear sigma model has an exact expression which induces an infinite geometric series in which the pattern for both the I = 0 and I = 2 s-wave scattering lengths to orders , and seems to agree with chiral perturbation theory predictions. The model is then gauged to study the mass differences between the vector meson and the axial vector meson as a possibly useful template for the role of a light scalar in QCD as well as for (at a different scale) an effective Higgs sector for some recently proposed walking technicolor models. The model is applied to the s-wave pion-pion scattering in QCD. Both the near threshold region and (with an assumed unitarization) the global region up to about 800 MeV are considered. It is noted that there is a little tension between the choice of bare sigma mass parameter for describing these two regions.
By including the parity reversed partner we study a simple two Higgs dou-blet model which reflects, in a phenomenological way, the idea of compositeness for the Higgs sector. It is relatively predictive. In one scenario, it allows for a hidden usual Higgs particle in the 100 GeV region and a possible dark matter candidate.
Poles in unitarized [pi pi] scattering amplitude are studied in a generalized linear sigma model which contains two scalar nonets (one of quark-antiquark type and the other of diquark-antidiquark type) and two corresponding pseu- doscalar nonets. It is shown that a reasonable agreement with experimental data is obtained up to about 1 GeV. Some comparison is made to the situation in the usual SU(3) linear sigma model with a single scalar nonet.
We show that the mixing of two bare nonets, one of which is of quark- antiquark type and the other of two quark- two antiquark type is, before chiral symmetry breaking terms are included, only possible for three flavors. Specif ically, our criterion would lead one to believe that scalar and pseudoscalar states containing charm would not have four quark admixtures. We also discuss some aspects associated with the possibility of getting new experi- mental information about scalars from semileptonic decays of heavy charged mesons into an isosinglet scalar or pseudoscalar plus leptons.
In part II we explore a predictive model based on permutation symmetry S3 for the masses and mixing matrix of three Majorana neutrinos. At zeroth order the model yielded degenerate neutrinos and a generalized tribimaximal mixing matrix. We first study the effects of the perturbation which violates S3 but preserves the well known (23) interchange symmetry. This is done in the presence of an arbitrary Majorana phase ψ which serves to insure the degeneracy of the three neutrinos at the unperturbed level. At this order the mass splitting was incorporated and the tribimaximal mixing matrix emerged with very small corrections but with a zero value for the parameter s13. Next a different, assumed weaker, perturbation is included which gives a non zero value for s13 and further corrections to other quantities. These corrections are worked out and their consequences discussed under the simplifying assumption that the conventional CP violation phase vanishes. It is shown that the existing measurements of the parameter s23 provide strong bounds on s13 in this model
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
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
Calendar Anomalies in Stock Market: A Case of KSE 100 Index
Get PDFThis paper aims to investigate the calendar anomalies in Karachi Stock exchange by using KSE 100 index during the period of 2008 to 2012. The study examined the existence of week days, weekend and monthly seasonal anomalies. These calendar effects are examined by applying different statistical techniques. First of all series of daily and monthly returns were calculated. Then mean and standard deviation of daily and monthly returns were calculated. The values of mean and standard deviation have rejected the first two null hypothesis and accepted the third one. The results provide an evidence for the existence of calendar anomalies at KSE 100 index. The results showed that there is significant difference among the returns of days of the week, and Friday has highest mean average return which makes it confirm that weekend effect exists at KSE. Finally monthly anomaly in stock returns is also present because there is highest positive return in the month of March. Keywords. Stock Market, Anomalies, weekday effect, weekend effect, monthly effect, Return
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