We study the structural, dynamical, and electronic properties of amorphous Si1−xGex :H alloys using firstprinciples local basis molecular dynamics techniques. The network topology and defects in the amorphous network have been analyzed. Structural changes, particularly an increase in number of defects and strained bond angles, have been found as the Ge content increases from x=0.1 to 0.5. The e...

Herein the optical properties of Hydroxypropyl methylcellulose/Potassium iodide (HPMC/KI) composite films were determined. The casting technique was introduced to make HPMC/KI with different KI salt concentrations (0.1–1) wt%. absorbance model used determine parameters like absorption edge, refractive index, real and imaginary sections dielectric function, extinction coefficient, Urbach energy,...

We have developed a subgap density of states (DOS) model of amorphous In-Ga-Zn-O (a-IGZO) based on optical and electrical measurements. We study the optical absorption spectrum of the a-IGZO using UV-Vis spectroscopy. Together with the first-principles calculations and transient photoconductance spectroscopy from the literature, we determine that the valence band tail and deep-gap states are do...

Cell-cell communication via connexin-43 (Cx43)-based gap junctions is transiently inhibited by certain mitogens, but the underlying regulatory mechanisms are incompletely understood. Our previous studies have implicated the c-Src tyrosine kinase in mediating transient closure of Cx43-based gap junctions in normal fibroblasts. Here we show that activated c-Src (c-SrcK(+)) phosphorylates the COOH...

An analytical nonadiabatic approach has been developed to study the dimerization gap and the optical absorption coefficient of the Su-Schrieffer-Heeger model where the electrons interact with dispersive quantum phonons. By investigating quantitatively the effects of quantum phonon fluctuations on the gap order and the optical responses in this system, we show that the dimerization gap is much m...

and the National Institutes of Health disbursed a combined $2.75 billion for biopreparedness and biodefence research.1,2 Investments in epidemiology, particularly for improving pathogen detection and incident response, are already underway. This recent focus on biodefence, however, is not universally welcome. According to Ezra and Mervyn Susser,3 a three-way division is emerging among epidemiol...

One of the main issues involved during tunnel construction with tunnel boring machines is the tail gap grouting. This gap is between the external diameter of tunnel lining and the excavation boundary that is filled with high-pressure grouting materials. In this work, three different approaches of gap grouting modeling in the FLAC3D software are investigated with a special attention to the...

The electronic structure of a large ~4096 atom! and realistic model of amorphous diamond is studied. The density of states and the individual eigenstates in the valence-band tail and midgap region are computed with two ‘‘order-N’’ spectral electronic-structure methods: the maximum entropy method and the shifted Lanczos method. We observe approximately exponential band tails at both valenceand c...