104,664 research outputs found
Unitary models in two dimensions
No full textUnitary models in two dimensions are classes of low dimensional theories which provide us with a convenient theoretical laboratory for studying various aspects of the theory of elementary particles. In this thesis, purely bosonic U(N) sigma models with the Wess-Zuraino-Witten (WZW) term in two-dimensional Euclidean space and the supersymmetric (Susy) U(N) σ models with and without this term are discussed. Particular attention is paid to the classical solutions of the equations of motion of these models. Due to the integrabihty of these models, we can associate with them a Lax-pair formalism. We observe that solutions of the Lax-pair equations of the U(N) a model provide us with solutions of the U(N) a model with the WZW-term. This is also the case for solutions of the Susy U(N) a model with the WZW-term which can be constructed from solutions of the Lax-pair equations of the Susy U(N) σ model. We present also some explicit solutions of the Susy U(N) a model without the WZW-term. Many properties of the constructed solutions for both the purely bosonic and Susy models are explored. In particular, we calculate the values of the action for some solutions and study the stability properties of these solutions and find that all the constructed solutions of these models correspond to the saddle points of the action. Finally we consider the hnearized fermion equations in the fixed background of a bosonic field. Special attention is paid to the case when the background field is given by a solution of the U(N) σ model with and/or without the WZW-term. Some classes of solutions of this problem are presented and their properties are discussed. We observe that a class of these solutions is related to the components of the energy-momentum tensor of the purely bosonic σ model and prove that some of these solutions are traceless
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Comparison of the effects of paired Nordic hamstring exercise and resistance banded Nordic hamstring exercise applied to taekwondo children on hamstring muscle strength and bilateral strength difference
No full textSosyal Bilimler Enstitüsü, Beden Eğitimi ve Spor Bilimleri Ana Bilim DalıÖZET YÜKSEK LİSANS TEZİ TEKVANDOCU ÇOCUKLARA UYGULANAN EŞLİ NORDİC HAMSTRİNG EGZERSİZİ İLE DİRENÇ BANTLI NORDİC HAMSTRİNG EGZERSİZİNİN HAMSTRİNG KAS KUVVETİ VE BİLATERAL KUVVET FARKI ÜZERİNE ETKİSİNİN KARŞILAŞTIRILMASI KAÇGAN, Cengizhan Beden Eğitimi ve Spor Ana Bilim Dalı Tez Danışmanı: Doç. Dr. Zait Burak AKTUĞ Haziran, 2024, 47 Sayfa Nordic hamstring egzersizi (NHE) hamstring kuvvetini ve sportif performansı artırmada, hamstring yaralanmalarını ise azaltmada sıklıkla kullanılan bir eksantrik kuvvet egzersizidir. Literatürde bu egzersiz çoğunlukla eşli olarak uygulanırken, direnç bandı ile yapılan NHE ile ilgili bir çalışmaya rastlanılmamıştır. Bu düşünce ile yapılan çalışmanın amacı, 12-14 yaş arası Tekvandoculara uygulanan eşli NHE ile direnç bantlı NHE'nin hamstring kas kuvveti ve bilateral kuvvet farkı üzerine etkisinin karşılaştırılmasıdır. Çalışmaya tekvando branşında lisanslı 32 sporcu katılmıştır. Katılımcılar sadece tekvando antrenmanı yapan grup (KG) (n=12), tekvando antrenmanına ilaveten eşli NHE'i yapan grup (ENHG) (n=10) ve tekvando antrenmanına ilaveten direnç bantlı NHE yapan grup (DBNHG) (n=10) olmak üzere üç gruba ayrılmıştır. Egzersiz grupları 6 hafta boyunca haftada 3 gün NHE uygulamıştır. Katılımcıların çalışmanın başında ve 6 haftalık egzersiz programı sonunda olmak üzere iki kez H-Bord cihazı ile hamstring kuvvetleri belirlenmiştir. Farklı protokollerin sonuçlarını, ön ve son test ölçümlerini ve protokol*zaman etkileşim etkisini incelemek için, tekrarlanan ölçümler iki yönlü ANOVA testi kullanılmıştır. Analiz sonucunda sağ bacak zirve tork ve ortalama güç parametrelerinde egzersiz gruplarında son test lehine artış bulunmuş, ENHG ve DBNHG ile KG arasında egzersiz grupları lehine fark tespit edilmiştir. Sol bacak zirve tork parametresinde bütün gruplarda, sağ bacak relatif kuvvet parametresinde ENHG ve DBNHG son test lehine fark tespit edilirken, DBNHG ile KG arasında DBNHG lehine fark belirlenmiştir. Bilateral kuvvet farkıparametresinde ise hem ön test son test arasında hem de gruplar arasında anlamlı fark tespit edilmemiştir. Ayrıca DBNHG'nun antrenman hacminin ENHG'na göre daha yüksek olduğu görülmektedir. NHE'ni uygularken doğru pozisyonun sağlaması, NHE esnasında gerilim altında geçen sürenin daha uzun olması ve NHE'de hamstring kırılma noktasının genişletilmesi nedenleri ile bu egzersiz yönteminin direnç bandı yardımıyla yapılması önerilmektedir. Anahtar kelimeler: Nordic hamstring, bilateral fark, tekvando, kuvvet, direnç bandıABSTRACT MASTER'S THESIS COMPARISON OF THE EFFECTS OF PAIRED NORDIC HAMSTRING EXERCISE AND RESISTANCE BANDED NORDIC HAMSTRING EXERCISE APPLIED TO TAEKWONDO CHILDREN ON HAMSTRING MUSCLE STRENGTH AND BILATERAL STRENGTH DIFFERENCE KAÇGAN, Cengizhan Department of Physical Education and Sport Thesis Advisor: Ass. Prof. Dr. Zait Burak AKTUĞ July, 2024, 47 Pages Nordic hamstring exercise (NHE) is an eccentric strength exercise that is frequently used to increase hamstring strength and sports performance and reduce hamstring injuries. While this exercise is mostly performed in pairs in the literature, no study has been found regarding NHE performed with a resistance band. With this in mind, the aim of the study is to compare the effects of paired NHE and resistance band NHE applied to Taekwondo athletes between the ages of 12-14 on hamstring muscle strength and bilateral strength difference. Thirty-two licensed athletes in the Taekwondo branch participated in the study. The participants were divided into three groups: the group that only did Taekwondo training (CG) (n=12), the group that did Taekwondo training in addition to paired NHE (PNHG) (n=10), and the group that did Taekwondo training in addition to resistance bands NHE (RBNHG) (n=10). Exercise groups applied NHE three days a week for six weeks. Hamstring strengths of the participants were determined twice with the H-Bord device, at the beginning of the study and at the end of the six-week exercise program. Repeated measures two-way ANOVA test was used to examine the results of different protocols, pre- and posttest measurements, and protocol*time interaction effect. As a result of the analysis, an increase was found in the right leg peak torque and average power parameters in favor of the post-test in the exercise groups, and a difference was detected between PNHG, RBNHG and CG in favor of the exercise groups. While a difference was detected in favor of PNHG and RBNHG posttest in the left leg peak torque parameter in all groups,in the right leg relative force parameter, a difference was determined in favor of RBNHG between RBNHG and CG. In the bilateral force difference parameter, no significant difference was determined between the pre-test and post-test and between the groups. It is also seen that the training volume of RBNHG is higher than that of PNHG. It is recommended to perform this exercise method with the help of a resistance band due to the reasons such as ensuring the correct position while performing NHE, the longer time spent under tension during NHE, and the widening of the hamstring breaking point in NHE. Key words: Nordic hamstring, bilateral difference, taekwondo, strength, resistance ban
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
No full textWe 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
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
Contribution of Information and Communication Technology (ICT) in Country’S H-Index
No full textThe aim of this study is to examine the effect of Information and Communication Technology (ICT) development on country’s scientific ranking as measured by H-index. Moreover, this study applies ICT development sub-indices including ICT Use, ICT Access and ICT skill to find the distinct effect of these sub-indices on country’s H-index. To this purpose, required data for the panel of 14 Middle East countries over the period 1995 to 2009 is collected. Findings of the current study show that ICT development increases the H-index of the sample countries. The results also indicate that ICT Use and ICT Skill sub-indices positively contribute to higher H-index but the effect of ICT access on country’s H-index is not clear
Fully Turbulent Mean Velocity Profile for Purely Viscous non-Newtonian Fluids
No full textThe characteristic near wall behavior of turbulent flow of purely-viscous non-Newtonian fluids is discussed for both power-law (P.-L.) and Herschel-Bulkley (H.-B.) rheological models. A proper scaling is presented for H.-B. fluids to establish an analogy with power-law fluids with same flow index. To provide reference data for turbulent flow of non-Newtonian fluids, DNS simulations of power-law fluids are conducted in a rectangular channel for a large range of power-law indices ( = 0.5, 0.69, 0.75, 0.9, 1, 1.2). The DNS data show that the mean velocity profile in the viscous and logarithmic layers follow expressions of the form and respectively, where shows a logarithmic dependency on the flow index.Comparison with some experimental data shows the above formulation to be valid for Reynolds numbers (based on shear velocity) as high as 1000
H-index and research evaluation: A suggested set of components for developing a comprehensive author-level index
No full textThe H-index has been investigated in various studies; this index has many strengths that have made it popular. However, it also has weaknesses, due to which other indicators have been developed. This study aims to identify the strengths and weaknesses of the H-index and provide the minimum set of necessary components for developing a comprehensive author-level index. In this systematic literature review, Scopus, PubMed, Web of Science, Emerald, and ProQuest databases were searched to identify relevant studies. From the number of 14,253 retrieved studies, after two stages of screening, 81 studies were selected according to the eligibility criteria for data extraction. The findings of the study led to the identification of 15 strengths in the three categories of Quality Features, Simplicity, and Suitability, and 13 weaknesses in the six categories of Publications, Citations, Academic Age, Author Credit Allocation, Variety of Fields, and mathematical calculation for H-index. Finally, 28 components were identified as the minimum set of necessary components to develop a comprehensive author-level index to help evaluate researchers more realistically and fairly. The minimum components that need to be considered in developing a comprehensive author-level index can be proposed as follows: Quality Features, Simplicity, Suitability, Publications, Citations, Academic Age, Author Credit Allocation, Variety of Fields, and mathematical calculation
Letter from Bob H. Suzuki, President, CSU Pomona, June 13, 1993
No full textA letter from President Bob H. Suzuki thanking guests of a garden reception and asking for their support to fund Michi Nishiura and Walter Weglyn Endowed Chair in Multicultural Studies.These materials are from box 73 and 74 of the Frank Chin Papers. The Frank Chin Papers contain personal and professional correspondence between Frank Chin and Michi Weglyn relating to particular projects on which either author was working as well as files related to the Day of Remembrance Tribute to Michi Weglyn
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