Flexible ceramic polymer composite substrates with spatially variable dielectrics for miniaturized RF applications

The goal of this research is to develop a process suitable for producing monolithic conformal substrates with a spatial arrangement of material cells according to a particular design creating novel material systems, useful for many multi- functional electronic and Radio Frequency devices. In this study, MCT ceramics (Mg-Ca-Ti-O systems) and organic binders (polymer solution) are mixed and fabricated as films through a process called tape casting to compromise between high dielectric constant and flexibility. Prior to optimizing the process, several characterization studies are carried out: Commercial spray dried MCT powders (Transtech Inc.) with dielectric constant k=70 and k=20 were analyzed as pressed and produced into tape cast films. Dielectric properties are then measured by an Agilent 16451B material analysis kit and their microscopic behavior is examined by scanning electron microscopy. Results show that flexible composite films show a maximum dielectric constant of e~22 unlike their powder pressed form with e ~16 but their loss behavior deteriorates when compared with their sintered form and a loss tangent factor of 0.001. The difference is attributed to the air content vs. polymer presence of the material in powder pressed form. Also, these substrates naturally are no longer flexible; hence studies are focused on their tape cast form. The potential of these dielectric shades to serve as candidate constituents for producing monolithic textured polymer-ceramic-composites with controllable loss is studied further. Four properties are of prime importance: tunability of dielectric constants to achieve miniaturization, flexibility via low temperature processing of polymers and loss controllability

V. International Balkan and Near Eastern Social Sciences Congress (IBANESS Kırklareli)

Abstract. This study aims to evaluate the V. International Balkan and Near East Social Sciences Congress (IBANESS Kırklareli) which was organized between 23-24 September 2017 in Lüleburgaz / Kırklareli. This congress has provided an important opportunity for all participants to present a multidisciplinary work space. Interpretations made by experienced academics have made a significant contribution to young academics and students for their future work. This congress was a successful congress in academic terms.Keywords. Knowledge economy, Knowledge assessment methodology, Clustering analysis.JEL. D83, C38, O57

Sustainability versus development: Mudanya's war of survival as a liveable city

Sustainable development assumes that the natural and historical resources of a city which constitute to its local characteristics, will not yield to urban and regional pressures. Economies of the advanced capitalist countries are more or less equal and efficient and sustainability can be developed as a criteria but what about the developing countries? Will they sustain their inequalities and inefficiencies? This concept assumes that every settlement had reached to a certain level of development so is far away from all the pressures of growth. But in developing countries such as Turkey, the basic concern is not the sustainability but the survival of local characteristics. Our anxiety is to regain the liveable characteristics of our cities which have already been dismissed and to achieve a certain level of liveability by increasing the quality of life. The most important problem of developing countries is the physical pressure originating from their level of growth not reached to a point of saturation. Mudanya, Turkey, lives this occasion in such a process worth to discuss. The current developments in Mudanya accomplish a striking example to an urban settlement's war in order not to lose its liveability against metropolitan growth. Deterioration of local values has gained speed especially with the planning of this settlement in Bursa Metropolitan Area. These values can be summarized as sea, the productive agricultural lands and cultural property. g The paper will discuss the concept of survivability within the example of Mudanya by conserving/protecting these values.

Robust Preconditioners for the High-Contrast Elliptic Partial Differential Equations

In this thesis, we discuss a robust preconditioner (the AGKS preconditioner) for solving linear systems arising from approximations of partial differential equations (PDEs) with high-contrast coefficients. The problems considered here include the standard second and higher order elliptic PDEs such as high-contrast diffusion equation, Stokes\u27 equation and biharmonic-plate equation. The goal of this study is the development of robust and parallelizable preconditioners that can easily be integrated to treat large configurations. The construction of the preconditioner consists of two phases. The first one is an algebraic phase which partitions the degrees of freedom into high and low permeability regions which may be of arbitrary geometry. This yields a corresponding block partitioning of the stiffness matrix allowing us to use a formula for the action of its inverse involving the inverses of both the high permeability block and its Schur complement in the original matrix. Singular perturbation analysis plays a big role to analyze the structure of the required subblock inverses in the high contrast case which shows that for high enough contrast each of the subblock inverses can be approximated well by solving only systems with constant coefficients. The second phase involves an efficient multigrid approximation of this exact inverse. After applying singular perturbation theory to each of the sub-blocks, we obtain that inverses of each of the subblocks with high contrast entries can be approximated efficiently using geometric multigrid methods, and that this approximation is robust with respect to both the contrast and the mesh size. The result is a multigrid method for high contrast problems which is provably optimal to both contrast and mesh size. We demonstrate the advantageous properties of the AGKS preconditioner using experiments on model high-contrast problems. We examine its performance against multigrid method under varying discretizations of diffusion equation, Stokes equation and biharmonic-plate equation. Thus, we show that we accomplished a desirable preconditioning design goal by using the same family of preconditioners to solve the elliptic family of PDEs with varying discretizations

Determinants of national innovation capacity in developing countries: An empirical survey

Abstract. National innovation capacity is seen as the main source of sustainable growth and prosperity of countries. National innovation capacity, being both an economic and political asset, is defined as the potential of a country to produce innovation. At the same time, measuring the capacity of national innovation provides important information about the dynamics of innovation in the field of economics. Also, it is seen that most of the studies on national innovation capacity have focused on developed countries. In this study, it is aimed to make an empirical analysis of the determinants of national innovation capacity in developing countries in comparison with developed countries. For this purpose, variables considered to be determinants of national innovation capacity are classified under three headings as national technological capability and infrastructure factors, external factors, and institutional factors. In most studies in the literature, national innovation capacity is represented only by the number of patents in the empirical analysis. However, in most of these studies, the disadvantages and deficient aspects of representing national innovation capacity only with the number of patents are mentioned and almost no alternative methods have been suggested. Based on the suggestions and methods in empirical studies, the national innovation capacity index is calculated and represented as a new output variable representing the national innovation capacity in the effort to fill the relevant gap in the literature. In the study, data in the period of 1996-2016 are analyzed by the panel data analysis method for 18 developing countries and 31 developed countries. The effects of national technological capabilities and infrastructure factors of national innovation capacity in developing countries are seen to be weak. At the same time, it is seen that external factors have a positive effect on national innovation capacity in these countries and this indicates the dependence on foreign technologies in the development of technological capabilities.Keywords. National Innovation Capacity, National Technological Capability, Developing Countries, Panel Data Analysis.JEL. O32, O33, C23