this work describes the optical and structure properties of nickel sulfide and cobalt sulfide nanoparticles in zsm-5 zeolite. the samples were obtained by sulfidation of the ni2+ and co2+ ion-exchange zsm-5 zeolites in a na2s solution at room temperature. the optical properties of the samples were studied by uv-visible spectroscopy. their crystalline structure and morphology were studied by x-r...

A reaction between chemical species is modeled by a particular reaction pathway, in which one reaction is very fast relative to the other one. The diffusion controlled reactions of these species together with a reaction intermediate are described by a system of three transient reactiondiffusion equations over a two-dimensional spatial domain. In the asymptotic limit of the reaction parameter te...

The PilT N terminus (PIN) domains with about 130 amino acids in length comprise a very large protein family present in all three kingdoms of life (Arcus et al. 2011). In the Pfam database, the PIN-domain family (PF01850) currently contains 8,807 members from bacteria, archaea, and eukaryotes. The biological functions of PIN-domains are diverse in various species. Most PIN domains have ribonucle...

zinc oxide (zno) nanopowders were synthesized by the sol–gel method from an ethanol solution of zinc sulfate heptahydrate in the presence of diethylene glycol surfactant. detailed structural and microstructural investigations were carried out using x-ray diffraction (xrd), high-resolution transmission electron microscopy (hrtem), field emission scanning electron microscopy (fe-sem), fourier tra...

Waveguides with low confinement loss, low chromatic dispersion, and low nonlinear effects are used in optical communication systems. Optical fibers can also be employed in such systems. Besides optical fibers, photonic crystal fibers are also highly suitable transmission media for optical communication systems. In this paper, we introduce two new designs of index-guiding photonic crystal fiber ...

Printed Circuit Board (PCB) of 50mm (L) x 10mm (W) x 0.8mm (H). The Printed Circuit Assembly is composed of a set of case A ATC capacitors (American Technical Ceramic, New York) allowing a 63.7 MHz tuning and a 50 Ω matching. An active decoupling circuit was also included using a PIN diode (Temex DH 80106 PIN diode) driven by the MR system during RF pulse transmission. As for the optical modali...

The detection of an optical signal using a photonic mixer device (PMD) as an alternative to the PIN photodiode for a high-speed infrared link is discussed. The PMD, at its linear range, is characterized as a correlator detector. The functionality of this PMD for a better Signal-to-Noise Ratio is described. With an improved mixing efficiency and photosensitive area, the PMD will replace the use ...

According to the structure and drive principle of the precision ball transmission, an innovative structure of weak rigidity combination planetary disc which set planetary motion and clearance adjustment function as a whole was proposed. The performance requirements of the key connection pair in weak rigidity combination planetary disc were analyzed. A structure connected by pins was designed. T...