1,720,964 research outputs found
Investigation of uplift behavior of group anchors.
No full textTEZ10247Tez (Yüksek Lisans) -- Çukurova Üniversitesi, Adana, 2013.Kaynakça (s. 121-124) var.xvii, 125 s. : res. (bzs. rnk.), tablo ; 29 cm.Bu çalışmada, kum zeminlere gömülü ankraj plakalarının çekme kapasitesi model deneyler yapılarak araştırılmıştır. Deneylerde kare geometride ankraj plakaları kullanılmıştır. Model deneylerde, gömülme oranı, kum sıkılığı, ankrajlar arası mesafe ve yerleşim düzeni parametrelerinin çekme kapasitesi üzerindeki etkileri araştırılmıştır. Çalışmada ayrıca, kum zemine gömülü ankrajların, PLAXIS 3D Foundation bilgisayar programı kullanılarak, 3 boyutlu sonlu elemanlar yöntemi ile sayısal çözümü yapılmıştır. Elde edilen deneysel ve sayısal sonuçlar karşılaştırılarak temel mühendisliğinde kullanılmak üzere tasarım parametreleri önerilmiştir.PLAXIS 3D. In this study, uplift capacity of anchor plates embedded in sand was investigated by conducting model tests. Square shaped plate anchors were used in the tests. The parameters investigated are the uplift capacity of embedment ratio, density of sand, spacing between anchors and configuration. FE analysis of the test models were also carried out by using the FEM program, PLAXIS 3D Foundation. The numerical analysis were conducted under 3D. The results obtained from the numerical method are compared with the experimental values. After comparing the results of experiments and the numerical studies some practical design parameters were suggested for the relevant foundation engineering applications.Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: MMF2012YL21
Investigation of the behaviour of single pile and pile groups under uplift load embedded in sand soil.
No full textTEZ12284Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2019.Kaynakça (s. 203-209) var.XXV, 211 s. :_res. (bzs. rnk.), tablo ;_29 cm.Bu çalışmada, kum zemine gömülü tekil kazık ve kazık gruplarının çekme yükü etkisindeki davranışları deneysel ve sayısal olarak incelenmiştir. Deneylerde; kazık yüzeyi, kazık gömülme oranı (L/D) ve zemin sıkılığı (Dr) gibi parametrelerin çekme kapasitesi üzerindeki etkileri araştırılmıştır. İki farklı kazık yüzeyi (pürüzlü ve pürüzsüz) ve zemin sıkılığı (%30 ve %80) için kazıklar arası mesafe oranının (S/D) etkisi incelenmiş ve en büyük çekme yükü değerini veren optimum mesafe oranı belirlenmiştir. Ayrıca kazık grubundaki her bir kazığa yük hücresi bağlanarak kazık yerleşiminin çekme kapasitesini ne oranda değiştirdiğinin tespiti amaçlanmıştır. Çalışmada, sıkı kum zemine gömülü kazıkların PLAXIS 3D bilgisayar programı kullanılarak üç boyutlu sonlu elemanlar yöntemi ile sayısal çözümü yapılmıştır. Deneysel ve sayısal çalışmalardan elde edilen sonuçların uyumlu olduğu görülmüş ve çalışmanın sonucunda, araştırılan parametrelerin kazıkların çekme yükü üzerinde önemli bir etkiye sahip olduğu belirlenmiştir.In this study, the behaviour of single pile and pile groups embedded in sand soil under the uplift load have been investigated both experimentally and numerically. The effects of some variables such as pile surface, pile embedment ratio (L/D) and relative density of sand (Dr) on the uplift capacity have been studied in the experiments. The effect of the spacing ratio between piles (S/D) has been observed for two different pile surface (rough and smooth) and relative density of sand (30% and 80%), and then the optimum spacing ratio between piles, where the maximum uplift load value is reached, has been determined. Moreover, by connecting a load cell to each pile in the group, it is aimed to detect the extent to which the pile placement changes the uplift capacity. In the study, the piles embedded in dense sand soil have been analysed with the three-dimensional finite element method by using PLAXIS 3D computer software. It has been understood that the results obtained from the experimental and numerical studies are in a good agreement, and the results show that the investigated variables have a significant effect on the uplift load of the piles
3D Numerical Response of a Single Pile Under Uplift Loading Embedded in Sand
No full textIn this study, the uplift behavior of a single pile has been investigated in sand, numerically. The pile used in the analyses is in circular shape in 25 mm diameter. The investigated parameters are embedment ratio of pile (L/D = 8, 12, and 16), material of pile (steel, aluminum, and delrin) and relative density of sand (RD = 30%, 50%, and 80%). For this purpose, a series of finite element analyses have been carried out by using Plaxis 3D. The results of analyses have been compared with the theoretical methods proposed for a single pile embedded in the loose sand. According to the results of both methods, the uplift capacity in the loose sand obtained from theoretical method gives a good agreement with that of present numerical analysis, and all investigated parameters affect significantly the uplift behavior of the pile. Moreover, the uplift capacity increases with the increase of the embedment ratio (L/D) and relative density of sand (RD). Additionally, the capacity of steel pile is more than aluminum and delrin piles.TUBITAK (The Scientific and Technological Research Council of Turkey); TUBITAKThe first author of this study has been supported by TUBITAK (The Scientific and Technological Research Council of Turkey) with post graduate scholarship. The first author would like to express her thanks to TUBITAK for this support
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
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
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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