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Kastamonu, Turkey

Kastamonu University is a public university located in Kastamonu and some of its districts, Turkey. It was established in 2006 after some colleges and schools in Kastamonu, which were administered by Ankara University and Gazi University, were gathered under one institution. Wikipedia.

Fine and small roots of trees are an important part of the terrestrial carbon (C) cycle because they comprise a large fraction of annual net primary production and as ephemeral tissues they are returned to the soil on relatively short time scales. Their decomposition in soil can play an essential role for nutrient cycling and organic matter turnover within ecosystems that are important determinants of plant productivity and ecosystem carbon (C) storage. However, the processes and factors influencing the fine-root decomposition rates in forest ecosystems has been studied less than that of litter shed from the above ground parts of trees. In the present study, we therefore investigated the effects of tree species, topography and soil depth on the decomposition rates of fine and small roots using alder (. Alnus glutinosa L.), Oriental spruce (. Picea orientalis L.) and pine (. Pinus sylvestris L.) tree species. The root samples collected from two aspects (north and south) and two altitudes (900. m and 1260) on each aspect, and were placed into 0-10. cm and 10-20. cm of soil depth. Standard root samples were also placed on the same sites in order to evaluate the effects of microclimate on the root decomposition rates. Alder roots showed the highest decomposition rates, followed by pine and Oriental spruce roots. For each tree species, the root samples placed on south aspect and at lower slope on each aspect decayed faster than that on north aspect and at higher slope. The root decomposition rates decreased with increasing root thickness and soil depth. Among the tree species, initial root litter quality (especially C:N ratio) played an important role on their decomposition rates. In addition to litter quality factor, air temperature in open area and under the stands affected decomposition rates of the standard root samples. © 2014 Elsevier B.V.

Senol A.,Kastamonu University | Senol A.,Abant Izzet Baysal University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

We study the sensitivity of anomalous ZZγ and Zγγ vertex couplings h3γ,Z and h4γ,Z, which would be a powerful sign of new physics, via the subprocess γq→Zq of the main reaction pp→pγp→ZqX at the LHC. We calculated limits on these couplings at 95% confidence level for various values of integrated luminosity. It is shown that the pp→pγp→ZqX reaction provides 1 order of magnitude improvement in the couplings h4γ,Z compared to the current experimental limits obtained in events dominated by Zγ production from the LHC and Tevatron. © 2013 American Physical Society.

Senol A.,Kastamonu University | Senol A.,Abant Izzet Baysal University
Nuclear Physics B | Year: 2013

The discovery of Higgs boson plays a crucial role in understanding the electroweak symmetry breaking sector. From now on, solving the dynamics of this sector needs precision measurements of the couplings of the Higgs boson to the Standard Model particles. In this work, we investigate the constrains on the anomalous HWW and HWWγ couplings, described by the dimension-six operators in the effective Lagrangian, in a high energy envisaged ep collider which is called Large Hadron electron Collider (LHeC). We obtained the 95% confidence level limits on the couplings of anomalous HWW and HWWγ vertex, with the design luminosity of 10fb-1 and electron beam energy of 140 GeV, through ep→νH+X, γp→WH+X and eγ→WHν processes by considering the new physics energy scale to be Λ=1TeV. The sensitivity of the LHeC to the new physics scale is also briefly discussed. © 2013 Elsevier B.V.

In this study, rapidly solidified hypereutectic Al-20Si-5Fe-XV (X = 0, 0.5, 1 and 1.5) alloys were fabricated by gas atomization in Ar atmosphere. Microstructural and spectroscopic analyses were performed using SEM, SEM - EDS and XRD measurements. Experimental results showed that addition of V to gas-atomized Al-20Si-5Fe alloys led to formation of a refined microstructure composed of finer Si and Fe-bearing intermetallics. Possible refining mechanism of Si phases is the IIT because of Rv:RSi is 1.38 close to the value of 1.65 which is the ideal ratio of radius for the impurity-atom to Si-atom (Ri:RSi). The reason of formation finer of δ-Al4FeSi2 phase with addition of V is that vanadium addition leads to an increment in the thermodynamic stability and a reduction in the free energy of δ-Al4FeSi2 phase. Therefore, finer and modified morphology became more favorable for δ-Al 4FeSi2 phase in terms of thermodynamic. Nanosize Si particles growing on the surface of Fe-bearing intermetallics and micro size polygonal Si phases were observed. There was no effect of V on the number of fine silicon particles growing up on the micro size polygonal Si phases. However, during solidification, addition of V led to an increase in the number of fine silicon particles growing on the Fe-bearing intermetallics. Microhardness measurements showed that there was an increase in the microhardness values of Al-20Si-5Fe alloys with addition of V, in general. ©2014 Elsevier B.V. All rights reserved.

Hancerliogullari A.,Kastamonu University
International Journal of Energy Research | Year: 2012

In the APEX (Advanced Power Extraction) studies, the conventional first solid wall facing the plasma is replaced with a fast flowing layer of a thin liquid wall. The concept of a free-surface first liquid wall concept is a revolutionary concept. The first liquid wall flows very fast and detains charged particles, and is followed by the thick liquid wall (blanket) which flows slowly and absorbs generated energy and converts it to heat. In the study, the flowing molten salt (i.e., first wall and blanket) is composed of Flibe (Li2BeF4) and is considered the main constituent mixed with different mole fractions (0-12%) of heavy metal salt (ThF4 or UF4) to increase the energy multiplication. Self-sufficient tritium breeding ratio (TBR>1.05) was taken into account to determine the upper limit of the fraction of heavy metal salt in the mixture. Design and calculations of APEX were carried out as 3-D torus by using MCNP-4B computer code. © 2011 John Wiley & Sons, Ltd.

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