1,721,030 research outputs found
Nakit akışı üretimi ve BİM ve simülasyon ile alternatif analiz
No full textCash flow analysis is a major aspect of managing a construction project to improve project success metrics and to prevent liquidity issues during construction phase. Conventional methods used to analyze cash flow simplify many process elements and perform analysis based on master-level schedule activities and their associated costs. Recent studies generate cash flow using building information models (BIM), construction schedule and financial parameters for more accurate project cash flow, but it is challenging to evaluate detailed project alternatives that improve project cash flow while satisfying project constraints and consider scenarios for project financials. This thesis develops a structured approach to generate project cash flows through a BIM and resource-integrated 3D simulation platform called GSimX. It also provides a prototype for project cash flow generation through Excel in order to verify and compare it with the simulation platform. Since cash inflows and outflows from simulation are generated based on common cash flow parameters with contractual focus, cash flow alternatives can easily be obtained by modifying parameters such as payment terms, activity sequences, and resources. The thesis also describes ways to evaluate generated cash flow alternatives to enhance the financial decision-making process and to avoid financial hurdles during project execution.Nakit akış analizleri inşaat yönetimi, projenin etkili bir şekilde ilerleyebilmesi ve oluşabilecek sorunların önüne geçilebilmesi adına büyük önem taşır. Kullanılan geleneksel nakit akis analizi yöntemleri ağırlıklı olarak basit düzeylerde olup, analizler genelde master program seviyesinde sağlanmakta ve aktivite bazında gerçekleştirilmektedir. Daha önce yapılan çalışmalarda nakit akışları yapı bilgi modellemesi (BIM) kullanılarak oluşturulmakta ve bu anlamda iş programı, kaynaklar, finansal parametreler ve diger etkenlerde goz onunde bulundurulmaktadir. Fakat alternatif nakis akış yöntemlerini incelemek ve bunlar hakkında belirli sonuçlara varmak zorlu olmakla beraber, projenin verimliği üzerinde etkili olabilir ve finansal anlamda değişik senaryoların incelenip uygulanmasında yardımcı olabilir. Bu tez proje nakit akışlarını BIM ve kaynak tabanlı bir simülasyon platformu olan GSimX üzerinde oluşturmak için yapısal bir yaklaşım geliştirmektedir. Bu amaçla gerekli inşaat nakit akışı parametreleri tanımlanmıştır. Excel üzerinde oluşturulan bir prototip nakit akışı ile yaklaşımı tanımlanmış ve elde edilen sonuçlar simülasyon sonuçları ile karşılaştırılabilir düzeye getirilmiştir. Bu tez ayrıca nakit akışının parametreler üzerinde simülasyon ortamında hesaplanması için gereksinimleri tanımlamıştır. Nakit akışları kontrat ağırlıklı yaygın parametreler üzerinden simülasyon sonrası hesaplandığından alternatif senaryolar ödeme şartları, aktivite sıralaması ve kaynaklar gibi farklı değişkenler kullanılarak kolayca oluşturulabilir. Ayrıca sunulan bu tezde oluşturulan alternatif karşılaştırılması için yöntemler tanımlanmakta, dolayısıyla projenin finansal karar verme sürecini geliştirilmekte ve imalat sırasında finansal problemlerin azaltılmasına katkıda bulunulmaktadır
Antimicrobial Effect of Zinc Oxide Nanoparticle Coating on Titanium 6 Aluminum 4 Vanadium (Ti-6Al-4V)-Fixed Orthodontic Retainer Substrate
No full textObjectives Due to its excellent biocompatibility, superior mechanical qualities, and exceptional corrosion resistance, titanium 6 aluminum 4 vanadium (Ti-6Al-4V) alloy is frequently used for medical and orthodontic purposes as a fixed retainer after active orthodontic treatment. Titanium lacks the antibacterial characteristics and is bioinert, this may influence the usage of such materials in the field of biomedical applications. Bacterial adhesion to the orthodontic retainer surface is a common first step in infection; this is followed by bacterial colonization ending with the formation of a biofilm. Once biofilm forms, it is highly resistant to medicines and the host immune system's defense mechanism, making it difficult to remove the biofilm from orthodontic retainer. This study aimed to test the antimicrobial effect of a zinc oxide (ZnO) nanoparticle coating on Ti-6Al-4V orthodontic retainers. Materials and Methods ZnO nanoparticles, with a particle size of 10 to 30 nm, were used to coat the alloy using the electrophoretic deposition method. Various parameters and surface characterization tests were employed to obtain an optimized sample. This sample was subjected to the microbial adherence optical density test to examine the adherence of Streptococcus mutans, Lactobacillus acidophilus bacteria, and Candida albicans. Results The optimized sample had a 5-mg/L ZnO concentration, applied voltage of 50 V, and a 1-cm distance between electrodes. The ZnO coating significantly reduced microbial adherence compared to uncoated samples, effectively inhibiting bacterial development. Conclusion Electrophoretic deposition is an efficient and cost-effective technique for coating orthodontic titanium retainer substrates. Coating Ti-6Al-4V with ZnO nanoparticles increased the antimicrobial effectiveness of the material and as the concentration of the nanoparticles rises, the antimicrobial effect increases too
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
Energy Efficiency Evaluation of Different Glazing and Shading Systems in a School Building
Get PDFThe energy conversations methods and techniques take a significant role in the energy performance of the buildings. Façade and shading systems are in continuous development, and recent studies are showing the importance of implementation of such systems to reduce energy consumption and enhance the effectiveness of the building performance. School buildings are mostly being used during daytime, hence, require active use of sunlight. A measure that is taken on a school building envelope can prevent overheating and overcooling and reduce the heating and cooling energy consumption but at the same time can increase the lighting energy consumption vice versa. Thus, it is necessary to optimise the energy required for climatisation of a building with lighting energy demand. The main aim of the paper is to provide analysis for façade and shading systems applied to a school building and study the effectiveness of it on energy consumption and conservation. The case study for this paper is a typical building project designed to be located in Istanbul, Turkey and has a traditional façade system which is clear double layer windows without any shading devices. The analyses of the energy efficiency of these systems will be presented. The different glazing types and shading systems alternatives will show the most efficient one to be used as some optimised alternatives for the systems. Findings indicate that proper glazing and shading systems can reduce the needed energy for heating and lightening and thus total energy consumption of a school building significantly
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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