A dual-band Planar inverted-F antenna (PIFA) for wireless applications has been presented in this paper. The proposed antenna is compact in size and design on FR4 substrate. The antenna consists of a slotted radiator supported by shorting walls and a small ground plane. Square shaped slot in radiating patch have been used to introduce dual band operation into the proposed antenna. The structure...

Resonant photoemission spectra of the O 2p-derived valence band of insulating ThO2 are compared to linear muffin-tin orbital (LMTO) density-of-state (DOS) and XPS intensity calculations. At Th 5d corelevel threshold energies (85 ~< hv <<. 120eV), resonance is greatest at the bottom of the O 2p band where calculated p/d hybrid states are greatest; p / f hybrid content is weak by comparison. We c...

Based on a thermodynamic model for size-dependent melting temperature, the size-dependent band-gap of low dimensional semiconductor compounds is modeled without any adjustable parameter. The model predicts an increase of the band-gap of nanoparticles and nanowires for IIBVIB and IIIB-VB semiconductor compounds, with decreasing their size, which is supported by available experimental and other t...

We present calculations for the temperature-dependent electronic structure of bulk ferromagnetic EuO based on a parametrization of the d-f model Hamiltonian using results of first-principles TB-LMTO band structure calculations. The presented method avoids the problem of double-counting of relevant interactions and takes into account the symmetry of the atomic orbitals. It enables us to determin...

The influence of the nonlocal Hartree-Fock (HF) exchange in narrow-band materials with finite band gaps is analyzed. The mean-field Hamil tonian in the crystal orbital (CO) basis contains two ^-dependent matrix elements responsible for the dispersion of the one-electron levels: the classical tight-binding integrals (kinetic energy of the electrons) that decay exponentially as well as the (non)l...

We study the spectral shape and the magnetic field induced polarization of hot-electron photoluminescence from the diluted magnetic semiconductor Ga,Mn As. It is demonstrated that the holes occupy predominantly the impurity band and not the valence band as required for the Rudermann-Kittel-Kasuya-Yosida-type exchange interaction. We show that the ground state of the impurity band is split by un...

The fluorescence emission and excitation properties of protochlorophyll in etiolated cucumber (Cucumis sativus L.) cotyledons and primary bean (var. Red Kidney) leaves were characterized at 77 K. Contrary to previous studies, it appears that the short-wavelength protochlorophyll emission band consists of four fluorescent components, instead of only one nonphototransformable protochlorophyll. It...

identification of genes affecting energy balance, milk yield and feed intake is an interesting area of researches in animal breeding. leptin gene polymorphism is associated with key economic affair. considering rich resources for animals, in our country, accomplishing a few assays to identify a gene that controls her traits with molecular genetics, and identifying the candidate genes in sheep b...

The sex-dependent differences in serum levels of complement components have been reported concerning C4 (1), C5 (2, 3), C6 (3), C4-binding protein (C4-bp) ~ (4), and sex-limited protein (Slp) (5) in the mouse complement system. The serum levels o f these components in adult mice are always higher in males than in females within each inbred strain and are strongly under hormonal control. With re...

Based on the theory o f photoluminescence polarization, a description o f the determination o f transition-moment directions in luminescent molecules oriented in a stretched polymer film is given. This method is applied to the linear trans-diphenylpolyenes (C2h symmetry): 1,8-diphenyloctatetraene (DPO ), 1,6-diphenylhexatriene (DPH) and 1,4-diphenylbutadiene (DPB). The same transition moment po...