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- MakaleAçık Erişim2025Investigation of the Dynamic Behavior of Buried Natural Gas Pipe System
Öztürk, Kaşif Furkan
Natural gas pipelines are important infrastructure elements that are often designed to be buried and can cross very long distances, both on the mainland and on the ocean seabed. In this context, researches on the safety of these structures, which are known to cause significant economic losses if damaged, still maintains its importance. From this point of view, the dynamic behavior of a buried pipe system modeled using the equivalent spring-dashpot approach is investigated for three different soil systems and two earthquake records with three different frequency contents. The research shows that while the peak von mises stress of the pipe system can generally decrease depending on decrease in soil stiffness, the peak lateral displacements of the pipe system can generally increase depending on the decrease in soil stiffness. Furthermore, the results point out that the peak von mises stresses and the lateral displacements of the pipe system can significantly increase from high frequency content to low frequency content depending on the frequency content of earthquake.
- MakaleAçık Erişim2021Solving Bigeometric Volterra Integral Equations by Using Successive Approximations Method
Güngör, Nihan
In this study, the successive approximations method has been applied to investigate the solution for the linear bigeometric Volterra integral equations of the second kind in the sense of bigeometric calculus. The conditions to be taken into consideration for the bigeometric continuity and the uniqueness of the solution of linear bigeometric Volterra integral equations of the second kind are researched. Finally, some numerical examples are presented to illustrate successive approximations method.
- MakaleYalnız künye2016Students understanding of mathematics using from prototypical examples: Analyze in linear algebra
Aydin, Sinan; Akkan, Yaşar
Mathematical objects are ʼnatural objects’ for the practical mind. Definitions and theories can only describe them, not create or construct them. A mathematical term is interpreted through its denotation as representing a collection of particular objects for the theoretical mind. So, theoretical and practical modes of thinking differ in the manner in which they constitute the meanings of words. Thinking in terms of prototypical examples, rather than definitions, became an obstacle to our students’ understanding the notion of linear transformation. In the course, linear transformations were defined as transformations of vector spaces which conserve linear combinations. The obstacle was revealed in the students’ attempts ‘linear extension problem’: given a transformation of a basis, to construct a linear transformation with those values on the basis. In the experimental course, the problem was not formulated in such general terms. It was restricted to two dimensions, and the students were not asked to ‘linearly extend a transformation from a basis to the whole plane’ but to assume the existence of such an extension and find some missing information about it. In this study we are discussing students understanding of mathematical concepts by means of linear transformation in linear algebra.
- MakaleYalnız künye2016A research on instıtutıonal socıal responsıbılıty projects executed in the matter of educatıon
Çalişir, Gülsüm
Together with developing world, needs, charges and responsibilities also are changing. At the age we are in holdings, enterprises, corporations and organisations had become charged to do community oriented works now. In this regard, those mentioned units had transformed to state that they felt themselves responsible to give they took from people to people again. Corporations especially had tended towards social responsibility stusies to be able to addres their target groups before societ within the context of public relations activities and to establish a bridge in between. As change in time also cause change in expectations, now corporations had concentrated on social responsibility studies to be able to be approved in society and to continue their existing prestiges, instead of contenting teirselves just with commercial activities. Thus, also the importance of the concept called institutional social responsibility had increased in the century we live. Within this frame, to research efforts made in social responsibility studies executed in the area of “education” is forming the subject of this study. From the point of view of mentioned notion, a sample had been formed through coincidental choice of ten of institutions becoming prominent in society in this study. According to the research done through web sites of these ten institutions included the sample, examples to the studies institutions executed in educational area had been given by telling their institutional social responsibility understandings and policies, and their contents had been tried to be expressed. While existance of institutional social responsibility policies in six institutions included the study had been drawing attention, it had been determined that Business Bank of Turkey’s (Türkiye İş Bankası) and Turkcell’s institutional social responsibility activities accomplished in educational area were more different than the other eight institution and realized in areas more than one.
- DergiSakarya University Journal of Science