Farklı yükseklklerden uygulanan darbe kuvvetinin çelik kiriş eleman davranışı üzerindeki etkisi

06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır.Çelik ve betonarme yapılar, statik yüklerin etkisine maruz kalmalarının yanı sıra dinamik yüklere de maruz kalabilmektedir. Yapının taşıyıcı elemanları üzerindeki sabit ve durağan yükler statik yük zamanla değişen ya da bir anda ortaya çıkan yükler ise dinamik yük olarak adlandırılmaktadır. Yapı taşıyıcı elemanları statik yük altında dengede iken, bir ivmeye sahip başka bir nesne tarafından dinamik yüklemeye maruz kaldığında aniden göçme durumuna oluşabilmektedir. Yapıyı göçme durumuna getiren bu yük dinamik bir yük olan darbe yüküdür. Nesneler darbe kuvvetinin etkisiyle temas kurdukları zaman, çarpışan elemanlar üzerinde gerilme değişimleri oluşmaktadır. Gerilme değişimleri sebebiyle elemanlar üzerinde deformasyonlar meydana gelebilmektedir ve bu deformasyonlar çok kısa bir sürede oluşmaktadır. Yapı elemanları için şekil değiştirme yatkınlığı olarak ifade edilen süneklik, eleman davranışı için önemli bir özellik olmaktadır. Süneklik eğrisinin altında kalan alan ise elemanda meydana gelecek enerji sönümleme kapasitesini yani diğer bir deyişle tokluğunu ifade etmektedir. Elemanlarda oluşan dinamik ve statik yükler birbirinden farklı olduğundan şekil değiştirme kapasiteleri, buna bağlı olarak toklukları birbirinden faklı olacaktır. Elemanlarda dinamik yüklerin sebep olduğu tokluğu ölçebilmek için birçok yöntem kullanılmaktadır ve bu yöntemlerden bir tanesi belirli bir yükseklikten ağırlık düşürme yöntemidir. Yapılan bu çalışmada yapı taşıyıcı elemanından biri olan kirişin darbe yükü etkisi altındaki davranışı ağırlık düşürme yöntemi ile deneysel olarak incelenmiştir. Çalışmada aynı kesitlere sahip çelik kutu profile farklı yüksekliklerden aynı ağırlıktaki çekiç ile darbe kuvveti uygulanmıştır.Steel and reinforced concrete structures can be exposed to dynamic loads as well as being subject to the effects of static loads. Static loads loads that change over time or occur suddenly are called dynamic loads. The structural carrier elements can break suddenly when subjected to dynamic loading by another object having an acceleration under static load. Stress changes occur on colliding elements when the objects come into contact with the impact force. Deformations can occur on the elements due to stress changes and these deformations occur in a very short time. Ductility, expressed as the deformation tendency for structural elements, is an important feature for element behavior. The area under the ductility curve is the energy damping capacity that will occur in the element, in other words its toughness. As the dynamic and static loads formed in the elements are different from each other, their deformation capacities and their toughness will be different from each other. Many methods are used to measure the toughness caused by dynamic loads, one of which is a weight reduction method from a certain height. In this study, the behavior of the beam which is one of the structural carrier elements under the impact load is investigated experimentally by weight reduction method. In this study, impact force was applied with the same weight hammer at different heights from steel box profile having the same cross section

SmartTrack: Efficient Predictive Race Detection

Widely used data race detectors, including the state-of-the-art FastTrack algorithm, incur performance costs that are acceptable for regular in-house testing, but miss races detectable from the analyzed execution. Predictive analyses detect more data races in an analyzed execution than FastTrack detects, but at significantly higher performance cost. This paper presents SmartTrack, an algorithm that optimizes predictive race detection analyses, including two analyses from prior work and a new analysis introduced in this paper. SmartTrack's algorithm incorporates two main optimizations: (1) epoch and ownership optimizations from prior work, applied to predictive analysis for the first time; and (2) novel conflicting critical section optimizations introduced by this paper. Our evaluation shows that SmartTrack achieves performance competitive with FastTrack-a qualitative improvement in the state of the art for data race detection.Comment: Extended arXiv version of PLDI 2020 paper (adds Appendices A-E) #228 SmartTrack: Efficient Predictive Race Detectio

Maxillary and Mandibular Third Molars Impaction with Associated Pathologies in a North Cyprus Population: A Retrospective Study

This study aimed to find out the incidence of impacted third molars and associated pathologies in people who live in the North Cyprus population. Dr. Burhan Nalbantoglu State Hospital is the only hospital that has an oral and maxillofacial surgery department among the state hospitals in North Cyprus. Patients who were referred to this department during a one-year period due to the complaints regarding their third molar were included in our study. This retrospective study involved 550 patients aged 16 to 65 years (1752 third molars). Chi-square tests were done for bilateral comparison between age, gender, and third molar (p < 0.05). Among the groups included in the study, the highest number of third molars originated from the 20–29 age group (n = 1050). Among all 1752 third molars, 716 (40%) of them erupted, while 1036 (60%) were impacted molar teeth, with significant differences between genders (p > 0.05). The most often impacted position in the mandible was the mesioangular type (42%) and in the maxilla was the vertical type (62%). Partially and completely impacted mandibular third molars showed a significant difference between the left and right sides (p < 0.05). A huge proportion of third molars are impacted in the North Cyprus population. The degree of impaction of wisdom teeth and the problems they cause should be well evaluated, and the surgical approach should be considered according to the baseline of this data

Maxillary and Mandibular Third Molars Impaction with Associated Pathologies in a North Cyprus Population: A Retrospective Study

This study aimed to find out the incidence of impacted third molars and associated pathologies in people who live in the North Cyprus population. Dr. Burhan Nalbantoglu State Hospital is the only hospital that has an oral and maxillofacial surgery department among the state hospitals in North Cyprus. Patients who were referred to this department during a one-year period due to the complaints regarding their third molar were included in our study. This retrospective study involved 550 patients aged 16 to 65 years (1752 third molars). Chi-square tests were done for bilateral comparison between age, gender, and third molar (p n = 1050). Among all 1752 third molars, 716 (40%) of them erupted, while 1036 (60%) were impacted molar teeth, with significant differences between genders (p > 0.05). The most often impacted position in the mandible was the mesioangular type (42%) and in the maxilla was the vertical type (62%). Partially and completely impacted mandibular third molars showed a significant difference between the left and right sides (p < 0.05). A huge proportion of third molars are impacted in the North Cyprus population. The degree of impaction of wisdom teeth and the problems they cause should be well evaluated, and the surgical approach should be considered according to the baseline of this data

The Effect of Post-activation Performance Enhancement of Coincidence Anticipation Timing in Basketball Players

The aim of this study was to examine the effect of the post-activation performance enhancement (PAPE) method of coincidence anticipation timing in male basketball players. Seventeen male basketball players (mean age 20.17 years, height 1.87 m, weight 80.08 kg, training age 10.05 years) were included in the study. The study consists of two sessions. In the first session, after the participants were informed about the study and their consent was obtained, anthropometric measurements, coincidence anticipation timing (CAT) performances, and one-repetition maximum measurements were performed, respectively. Two days later, each participant performed five repetitions of back squats with 80% of one-repetition maximum (1RM) resistance after 20 min of general warm-up phases. Then, participants rested passively for 3 min. The CAT measurements of the participants were recorded after the rest period. Data were analyzed separately for CAT3 and CAT9 timing error scores in terms of pre-/post-PAPE. The results of the paired sample t-test showed that PAPE significantly decreased timing error scores on CAT 9 mph (p < 0.01). The same results were found for CAT 3 mph, and the Wilcoxon test result showed significantly decreased timing error scores after PAPE (p < 0.05). The findings showed that PAPE is an effective method for improving anticipation performance in sports such as basketball, where success is achieved through fast games. It can contribute positively to game-specific cognitive processes