End spaces of graphs are normal

We show that the topological space of any infinite graph and its ends is normal. In particular, end spaces themselves are normal.Comment: 8 page

The effect of spatial frequency on peripheral collinear facilitation

The detection of a Gabor patch (target) can be decreased or improved by the presence of co-oriented Gabor patches (flankers) having the same spatial frequency as the target. These phenomena are thought to be mediated by lateral interactions. Depending on the distance between target and flankers, commonly defined as a multiple of the wavelength (λ) of the carrier, flankers can increase or decrease a target's detectability. Studies with foveal presentation showed that for target-to-flankers distances 3λ contrast thresholds decrease. Earlier studies on collinear facilitation at the near-periphery of the visual field (4° of eccentricity) showed inconsistent facilitation (Shani & Sagi, 2005, Vision Research, 45, 2009-2024) whereas more recent studies showed consistent facilitation for larger separations (7-8λ) (Maniglia et al., 2011, PLoS ONE, 6, e25568; Lev & Polat, 2011, Vision Research, 51, 2488-2498). However, all of these studies used medium-to-high spatial frequencies (3-8cpd). In this study we tested lower spatial frequencies (1, 2, and 3cpd) with different target-to-flankers distances. The rationale was that near-peripheral vision is tuned for lower spatial frequencies and this could be reflected in collinear facilitation. Results show consistent collinear facilitation at 8λ for all the spatial frequencies tested, but also show collinear facilitation at shorter target-to-flanker distance (6λ) for the lowest spatial frequencies tested (1cpd). Additionally, collinear facilitation decreases as spatial frequency increases; opposite to the findings of Polat (2009, Spatial Vision, 22, 179-193) in the fovea, indicating a different spatial frequency tuning between foveal and peripheral lateral interactions

Dynamic phase transitions in a ferromagnetic thin film system: A Monte Carlo simulation study

Dynamic phase transition properties of ferromagnetic thin film system under the influence both bias and time dependent magnetic fields have been elucidated by means of kinetic Monte Carlo simulation with local spin update Metropolis algorithm. The obtained results after a detailed analysis suggest that bias field is the conjugate field to dynamic order parameter, and it also appears to define a phase line between two antiparallel dynamic ordered states depending on the considered system parameters. Moreover, the data presented in this study well qualitatively reproduce the recently published experimental findings where time dependent magnetic behavior of a uniaxial cobalt films is studied in the neighborhood of dynamic phase transition point.Comment: 15 pages, 5 Figure

Nonequilibrium dynamics of a spin-3/2 Blume Capel model with quenched random crystal field

The relaxation and complex magnetic susceptibility treatments of a spin-3/2 Blume-Capel model with quenched random crystal field on a two dimensional square lattice are investigated by a method combining the statistical equilibrium theory and the thermodynamics of linear irreversible processes. Generalized force and flux are defined in irreversible thermodynamics limit. The kinetic equation for the magnetization is obtained by using linear response theory. Temperature and also crystal field dependencies of the relaxation time are obtained in the vicinity of phase transition points. We found that the relaxation time exhibits divergent treatment near the order-disorder phase transition point as well as near the isolated critical point whereas it displays cusp behavior near the first order phase transition point. In addition, much effort has been devoted to investigation of complex magnetic susceptibility response of the system to changing applied field frequencies and it is observed that the considered disordered magnetic system exhibits unusual and interesting behaviors. Furthermore, dynamical mean field critical exponents for the relaxation time and complex magnetic susceptibility are calculated in order to formulate the critical behavior of the system. Finally, a comparison of our observations with those of recently published studies is represented and it is shown that there exists a qualitatively good agreement.Comment: 13 pages, 8 figure

Nonequilibrium dynamics of a mixed spin-1/2 and spin-3/2 Ising ferrimagnetic system with a time dependent oscillating magnetic field source

Nonequilibrium phase transition properties of a mixed Ising ferrimagnetic model consisting of spin-1/2 and spin-3/2 on a square lattice under the existence of a time dependent oscillating magnetic field have been investigated by making use of Monte Carlo simulations with single-spin flip Metropolis algorithm. A complete picture of dynamic phase boundary and magnetization profiles have been illustrated and the conditions of a dynamic compensation behavior have been discussed in detail. According to our simulation results, the considered system does not point out a dynamic compensation behavior, when it only includes the nearest-neighbor interaction, single-ion anisotropy and an oscillating magnetic field source. As the next-nearest-neighbor interaction between the spins-1/2 takes into account and exceeds a characteristic value which sensitively depends upon values of single-ion anisotropy and only of amplitude of external magnetic field, a dynamic compensation behavior occurs in the system. Finally, it is reported that it has not been found any evidence of dynamically first-order phase transition between dynamically ordered and disordered phases, which conflicts with the recently published molecular field investigation, for a wide range of selected system parameters.Comment: 10 pages, 7 figure

Development of organic animal production in Turkey

Turkey is located at a point where the three continents are making up the old world. Europe, Asia and Africa are close to each other thus, making it is a pre-eminent centre of commerce for centuries. Turkey’s surface area is 814,578 sq km of which 790,200 sq km are in Asia (Anatolia) and 24.378 sq km are in Europe. Turkey is divided into seven regions (Ege, Marmara, Blacksea, Mediterranean, Central Anatolia, East Anatolia and South East Anatolia Regions). The prevailing climate in Turkey is hot dry summers with mild, wet winters; harsher in interior. Terrain is composed of mostly mountains, narrow coastal plains and high central plateau. Because of its geographical conditions, the mainland of Anatolia has been found as favourable location for settlement throughout history. Turkey has a suitable position for organic agriculture because of its different ecosystems and rich biodiversity. In addition to this, about 40 % population are engaged in agriculture. Total cultivated agricultural area is estimated to be 22,156,234 hectares. Currently, only 103,190 hectares of total agricultural area is in use for organic farming (~0.5% of agricultural land). The aim of this paper is to show the development of organic farming and to determine the possibilities for the future development of organic animal production in Turkey

Pulmonary valvulotomy in a fetus with pulmonary atresia with intact ventricular septum : first experience in Turkey

The mortality and morbidity of children with pulmonary atresia with intact ventricular septum (PA/IVS) is closely related with right ventricle hypoplasia and its consequent hemodynamics. Prenatal intervention for fetuses with PA/IVS has the potential to improve growth of the RV and the prospect of a biventricular outcome after birth. Successful valvulotomy of the pulmonary valve (PV) was performed in a fetus with PA/IVS at 28 weeks. Following the procedure there was an improvement in fetal hemodynamics. In utero perforation and dilation of the PV in midgestation fetuses with PA/IVS is technically feasible. The initial results are promising and may be associated with improved right heart growth and postnatal outcome.peer-reviewe

Macroeconomic Shocks and Labor Supply in Emerging Countries. Some Lessons from Turkey

We investigate the general equilibrium effects of minimum consumption constraints over labor supply decisions. Within a simple static model, a minimum consumption constraint modifies labor supply decisions of unskilled workers, generating the well-known added worker effect. The results of the model help to analyze the Turkish labor market where added worker effects were observed following the 2001 crisis. We investigate the asymmetric effects of the crisis, using the Household Budget Surveys that cover the period between 2002 and 2005. The substantial decrease in real wages has increased labor supply for unskilled labor, especially for women.Added worker, Taxation, Bivariate Probit, Labor Supply, Turkish Labor Market