Kirişle Güçlendirilmiş Kabuk Yapılar İçin Yapay Sinir Ağ Bazlı Analiz Yöntemi Geliştirilmesi

Konferans Bildirisi-- İstanbul Teknik Üniversitesi, Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2017Conference Paper -- İstanbul Technical University, Theoretical and Applied Mechanical Turkish National Committee, 2017Bu çalışmanın amacı, kirişle güçlendirilmiş kabuk yapıların tasarımına yönelik bir araç geliştirmektir. Geliştirilecek aracın bu yapıların yük taşıma kapasitesini ve ağırlığını hızlı şekilde belirlemesi gerekmektedir. Bu amaçla, Python 2.7 programı kullanılarak yazılmış bir betikle 1440 farklı güçlendirilmiş kabuk yapının sonlu elemanlar (SE) modeli oluşturulmuş ve ticari SE programı olan ABAQUS kullanılarak bu modeller analiz edilmiştir. Yazılan betik, modelin oluşturulması, modelin analizi, burkulma yükünün, çökme yükünün ve toplam ağırlığın elde edilmesi ve ABAQUS analiz sonuçlarının derlenmesi için kullanılmıştır. Bu 1440 modelin girdi parametreleri ve analiz sonuçları, hâlihazırda yaratılmamış olan güçlendirilmiş kabuk yapıların burkulma yükünü, çökme yükünü ve ağırlığını hızlı bir şekilde belirlemek için MATLAB NNTOOL araç kutusunda bir yapay sinir ağı (YSA) oluşturulmasında kullanılmıştır. Oluşturulan YSA’nın performansı SE sonuçlarıyla yapılan karşılaştırmalarla gösterilmiştir.The purpose of this work is to develop a tool for the design of skin-stringer structures. The tool to be developed needs to quickly identify the load carrying capacity and weight of these structures. For this purpose, a finite element (FE) model of 1440 different skin-stringer structures was created with a script written in Python 2.7, and these models were analyzed using the commercial FE program ABAQUS. The script was used to construct the model, analyze the model, calculate the buckling load, the collapse load and the total mass, and collect the ABAQUS analysis results. The input parameters and analysis results of these 1440 model have been used to create an artificial neural network (ANN) in the MATLAB NNTOOL toolbox for fast determination of the buckling load, collapse load, and weight of the skin-stringer assemblies that have not yet been created. The performance of the generated ANN is shown in comparison with FE results

Geometric Morphometric Study and Cluster Analysis of Late Byzantine and Modern Human Crania

Inter-population variation of cranial morphology, which plays an important role in human evolution studies and biological research, can be studied morphologically and metrically. Geometric morphometry compares body forms using specific landmarks determined by anatomical prominences. The aim of this study was to identify cranial shape differences between the crania of Byzantium period humans and modern humans. Variability in cranial shape was examined using the geometric morphometric technique based on landmark coordinates. Landmark coordinate data were collected from two-dimensional digital photogrammetry and were analyzed using generalized Procrustes analysis, hierarchical clustering and thin-plate spline analysis

Geometric Morphometric Study and Cluster Analysis of Late Byzantine and Modern Human Crania

Inter-population variation of cranial morphology, which plays an important role in human evolution studies and biological research, can be studied morphologically and metrically. Geometric morphometry compares body forms using specific landmarks determined by anatomical prominences. The aim of this study was to identify cranial shape differences between the crania of Byzantium period humans and modern humans. Variability in cranial shape was examined using the geometric morphometric technique based on landmark coordinates. Landmark coordinate data were collected from two-dimensional digital photogrammetry and were analyzed using generalized Procrustes analysis, hierarchical clustering and thin-plate spline analysis

Kirişle güçlendirilmiş¸ kabuk yapılar için yapay sinir ağ bazlı analiz yöntemi geliştirilmesi.

The purpose of this work is to develop a tool for the design of skin-stringer structures. The tool to be developed needs to quickly identify the load carrying capacity and weight of these structures. For this purpose, finite element (FE) models of 1440 different skin-stringer structures were created with a script written in Python 2.7, and these models were analyzed using the commercial FE program ABAQUS. The script was used to construct the model, analyze the model, calculate the buckling load, the collapse load and the total mass, and collect the ABAQUS analysis results. The input parameters and analysis results of these 1440 model were used to create an artificial neural network (ANN) in the MATLAB NNTOOL toolbox for fast determination of the buckling load, the collapse load, and the weight of the skin-stringer assemblies that have not yet been created. The performance of the generated ANN was shown in comparison with FE results. M.S. - Master of Scienc

Buhar oluşturan elementlerin atomik absorpsiyon spektrometri ile tayininden önce elektrik akımı ile ısıtılan w-sarmal üzerinde hat üstü önzenginleştirilmesi

Vapor generation in atomic spectrometry is a well established technique for the determination of elements that can be volatilized by chemical reactions. In-situ trapping in graphite furnaces is nowadays one of the most popular methods to increase the sensitivity. In this study, resistively heated W-coil was used as an online trap for preconcentration and revolatilization of volatile species of Bi, Cd and Pb. The collected analyte species were revolatilized rapidly and sent to a quartz Ttube atomizer for AAS measurement. Although the nature of revolatilized species of Bi and Pb are not clear, they are probably molecular since they can be transported at least 45 cm without any significant decrease in the peak height values. However, cadmium is revolatilized from the trap surface as atoms. The experimental parameters were optimized for the highest vapor generation, trapping and revolatilization efficiencies. The concentration limits of detection calculated by the 3 of blank solution were found to be 0.0027, 0.0040 and 0.015 ng/mL for Bi (18 mL), Cd (4.2 mL) and Pb (2 mL), respectively; enhancement factors in the sensitivity were 130, 31 and 20, respectively. These values are comparable with those obtained by in-situ trapping in graphite furnaces or even ICP-MS found in the literature or better. Sensitivity can be improved further for Bi and Cd using larger sample volumes, but purification of blank is required for Pb. Certified standard reference materials were analyzed for the assessment of accuracy of developed method.Ph.D. - Doctoral Progra

Choline acetyltransferase and tyrosine hydroxylase activities in Glandula suprarenalis and the effect of medulla spinalis incision on this activity

Bu çalışmada 26 erkek sıçanda (Rattus norvegicus domesticus-L albino-B) glandulae suprarenales ' te kolin asetiltransferaz aktivitesinden yararlanılarak sağ ve sol bezlere gelen preganglioner simpatik sinir liflerinin dağılımı, tirozin hidroksilaz aktivitesinden yararlanılarak da postganglioner kromaffin hücrelerdeki simpatik aktivite araştırıldı. Göğüs simpatik zincirinin başladığı segmentlerin üzerinden cerrahi yöntemlerle yapılan medulla spinalis yarı kesileri ile kesi oluşturulan taraftaki glandula suprarenalis 'te simpatik aktivite normal düzeyde sürdürülürken, diğer tarafta aktivite artışı olduğu görüldü. Medulla spinalis kesisinin daha üst seviyede bulunan merkezlere etkisi olmadı. Simpatik sisteme etkili aktif madde kullanılmayan sıçanlarda taklit cerrahi girişim yapılması kontrol grubuna göre anlamlı bir farklılık göstermedi. Glandula suprarenalis' te ölçülen enzim aktiviteleri sıçanların sağ ve sol bezlerinde farklılık gösterdi