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A Comparative Structural, Architectural and Cost-Based Analysis of Seismic Design Principles Applied in Reinforced Concrete Residential Buildings in Turkey
(Crc Press-taylor & Francis Group, 2010) Ozmen, C.; Özmen, Cengiz; Mimarlık
This study demonstrates that it is possible to design earthquake resistant reinforced concrete residential structures without significant compromises in the spatial quality and economic viability of the building. The study addresses architects, structural engineers and private entrepreneurs who are the important players in the Turkish construction industry. In structural analyses, a set of four parametric mathematical models are used to demonstrate the effects of increased column cross-sections and use of shear-walls on the seismic performance of reinforced concrete structures. Architectural analyses are carried-out through three case-studies selected from the earthquake affected city of Bolu in Turkey. Cost-based analyses demonstrated that it is possible to design earthquake resistant reinforced concrete residential buildings with a 4-6% increase in the building cost and an economically acceptable 10% decrease in profits.
On the Properties of Piezoelectric Materials Based Upon Orthonormal Representations
(Crc Press-taylor & Francis Group, 2014) Dinckal, C.; Dinckal, C.
For piezoelectric tensor, the decomposition method based upon irreducible orthogonal representation is overviewed. Besides, orthonormal tensor basis method is improved to express any third rank tensors such as piezoelectric tensor showing the piezoelectric effect of the material properties on the structures. Numerical examples for materials from different crystal symmetry classes serve to illustrate and verify the orthonormal tensor basis method. The differences and similarities are stated by comparing the methods presented in this work and the others in literature. It is also demonstrated that for hexagonal symmetry, each decomposed parts obtained from orthonormal tensor basis method has physical meaning. Furthermore, the norm based upon orthonormal tensor basis representation of piezoelectric tensor is obtained explicitly for each crystal symmetry classes and those results are used to study the piezoelectric effect of different materials. It is also shown that one can determine in which material the piezoelectric effect is stronger by using the norm concept for any material from various crystal symmetry classes.
Epitaxial Graphene and Carbon Nanotubes on Silicon Carbide
(Crc Press-taylor & Francis Group, 2014) Buke, Goknur C.; Buke, Goknur C.
Graphene (i.e., a single layer of graphite) and carbon nanotubes (CNTs; i.e., graphene rolled into a cylinder) are excellent candidate materials for advanced applications because of their unique electrical, optical, and mechanical properties combined with a high surface area. The successful development of graphene-/CNT-based technology depends on large-scale availability of the high-quality, reproducible, and uniformly ordered material. One of the most versatile methods to produce vertically, self-aligned CNTs and epitaxial graphene is the vacuum annealing of silicon carbide single crystals [1,2]. This is a very versatile method because carbon is supplied from the carbide lattice as known from the synthesis of carbide-derived carbons (CDCs, see Figure 4.1) and, as no catalysts or secondary phases are utilized; the produced graphene and CNTs exhibit extremely high purity. However, to increase the grain/domain size and quality of these carbon nanostructures, further control of the process is needed. © 2014 by Taylor & Francis Group, LLC.

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