Checklist of the Hydraenidae (Coleoptera) of Turkey, with notes on distribution

A checklist of the Hydraenidae recorded from Turkey is presented. The checklist includes data on the distribution and relevant references for 210 species/subspecies: two Aulacochthebius Leach, 113 Hydraena Kugelann, 21 Limnebius Leach, and 74 Ochthebius Leach. On the basis of their current distribution, the established 210 species/subspecies can be classified into 28 zoogeographical categories, grouped into six complexes. The largest number of species belongs to the group of Turkey endemics (49.05 %), which reflects the local character of the fauna. Copyright © 2011 · Magnolia Press

The role of the family in attributing meaning to living with HIV and its stigma in Turkey

Stigma attached to HIV/AIDS remains a global problem, with severe negative consequences for people living with HIV (PLHIV). Family support is fundamental for PLHIV’s psychological and physical well-being. HIV-related stigma is high in Turkey, where HIV/AIDS prevalence is low and the epidemic is not considered a priority. Based on qualitative data generated with HIV-positive women and men, this article explores the process of stigmatization, as experienced and perceived by PLHIV in Turkey, focusing on the institution of the family. Results indicated that enacted stigma from family members is lower than anticipated. While most participants’ narratives showed patterns of support rather than rejection from families, the strong expectations around the cultural value attributed to “the family” are found to be the main facilitators of internalized stigma. The article critically discusses the meaning and implications of family support, addressing the role of patriarchal values attributed to womanhood, manhood, and sexuality in Turkey

Effect of Intense Laser Field in Gaussian Quantum Well With Position-Dependent Effective Mass

In this paper, the effects of the intense laser field (ILF) and position dependent mass (PDM) on the electronic structure in a Gaussian quantum well are theoretically deduced by using the diagonalization method for obtaining energy levels and corresponding wave functions. We find that, in the case of narrow PDM distribution, the dependence of the energy levels on the effective length of the electron mass distribution becomes more apparent, and the evolution of the dressed mass with ILF is significant. Given this feature, it is more meaningful to take into consideration the PDM of the electron in the low dimensional semiconductor heterostructures under the ILF

Optical Properties of Cylindrical Quantum Dots with Hyperbolic-Type Axial Potential under Applied Electric Field

In this paper, we have researched the electronic and optical properties of cylindrical quantum dot structures by selecting four different hyperbolic-type potentials in the axial direction under an axially-applied electric field. We have considered a position-dependent effective mass model in which both the smooth variation of the effective mass in the axial direction adjusted to the way the confining potentials change and its abrupt change in the radial direction have been considered in solving the eigenvalue differential equation. The calculations of the eigenvalue equation have been implemented considering both the Dirichlet conditions (zero flux) and the open boundary conditions (non-zero flux) in the planes perpendicular to the direction of the applied electric field, which guarantees the validity of the results presented in this study for quasi-steady states with extremely high lifetimes. We have used the diagonalization method combined with the finite element method to find the eigenvalues and eigenfunction of the confined electron in the cylindrical quantum dots. The numerical strategies that have been used for the solution of the differential equations allowed us to overcome the multiple problems that the boundary conditions present in the region of intersection of the flat and cylindrical faces that form the boundary of the heterostructure. To calculate the linear and third-order nonlinear optical absorption coefficients and relative changes in the refractive index, a two-level approach in the density matrix expansion is used. Our results show that the electronic and, therefore, optical properties of the structures focused on can be adjusted to obtain a suitable response for specific studies or goals by changing structural parameters such as the widths and depths of the potentials in the axial direction, as well as the electric field intensity

Age, growth, and gonadosomatic index (gsi) of mediterranean horse mackerel (trachurus mediterraneus steindachner, 1868) in the eastern black sea

WOS: 000265870500005The aim of this study was to calculate the basic population parameters of Trachurus mediterraneus off the coast of the Eastern Black Sea. Average total length was estimated as 13.52 +/- 1.884 cm for the entire population, 13.08 +/- 1.594 cm for males, and 13.62 +/- 1.804 for females. Average weight was 20.27 +/- 8.819 g for the entire population, 18.65 +/- 7.626 g for males, and 2131 +/- 9.184 g for females. Age of the fish ranged between 0 and 5 years. Length-weight, age-length, and age-weight relationships were estimated for the population, where W = 0.0089 x L-2.9552: L-t = 26.09 (1 - e(-0.125(t + 4.002))); and W-t = 136.56 (1 - e(-0.125(t + 4.002))) Total mortality rates were Z = 3.73 year(-1) and M = 0.29 year for natural deaths. and F = 3.44 year(-1) for fishing mortality.Scientific Research Fund of Karadeniz Technical UniversityThis study was financially supported by the Scientific Research Fund of Karadeniz Technical University. We would also like to thank Prof. Dr. Ertug Duzgunes for his invaluable comments about this study

Electronic and optical properties of a D-2(+) complex in two-dimensional quantum dots with Gaussian confinement potential

Using the two-dimensional diagonalization method and the effective mass approximation, the electronic structure and intersubband optical absorption of the singly ionized double donor complex confined in a Gaussian quantum dot have been investigated. The obtained results indicated that the quantum dot size and internuclear distance significantly affect the binding energy, dissociation energy, equilibrium distance, and amplitude of the optical absorption. Also, we conclude that a significant increase in the amplitude of the dipole-related matrix element and the energy difference between the two lowest-lying energy states is observed when the distance between the donor atoms is in the order of the quantum dot size. Consequently, the electronic and optical properties can be precisely tuned by controlling the system's size and the internuclear distance