We have explored the mechanical properties, electronic structures and phase transition behaviors of three designed new phases for element boron from ambient condition to high-pressure of 120 GPa including (1) a C2/c symmetric structure (m-B₁₆); (2) a symmetric structure (c-B₅₆) and (3) a Pmna symmetric structure (o-B₂₄ ). The calculation of the elastic constants and phonon dispersions shows tha...

We investigated optical properties of Pr0.5Sr0.5MnO3, which has the Atype antiferromagnetic ordering at a low temperature. We found that T dependence of spectral weight transfer shows a clear correlation with the magnetic phase transition. In comparison with the optical conductivity results of Nd0.5Sr0.5MnO3, which has the CE-type antiferromagnetic charge ordering, we showed that optical proper...

The model considered is a d = 2 layered random Ising system on a square lattice with nearest neighbours interaction. It is assumed that all the vertical couplings are equal and take the positive value J while the horizontal couplings are quenched random variables which are equal in the same row but can take the two possible values J and J −K in different rows. The exact solution is obtained in ...

showing the occurrence of glass/rubber transition in bovine serum albumin (a globular protein) atlow moisture levels and the occurrence of maillard crosslinking in gelatin in previous works, the importanceof the state of glass or rubber of bsa on the rate and extent of polymerisation, protein solubility, colour andsds page patterns in the presence and absence of ascorbic acid, diketogulonic aci...

Temperature dependent x-ray absorption spectra investigation were measured for Ba(1-x)K(x)BiO3 (Bi L3-edge) with x =0.0, 0.25, 0.4, 0.5 and for BaPbO3 (Pb L3-edge). It was found that at low temperatures the Debye-Waller factor of the square diagonal Bi-Bi bond has the maximum value near the insulator-metal phase transition for the compound with x = 0.25 and x = 0.4. Temperature dependence of th...

The band-edge optical response of transition metal dichalcogenides, an emerging class of atomically thin semiconductors, is dominated by tightly bound excitons localized at the corners of the Brillouin zone (valley excitons). A fundamental yet unknown property of valley excitons in these materials is the intrinsic homogeneous linewidth, which reflects irreversible quantum dissipation arising fr...

We solve a two-dimensional model for polymer chain folding in the presence of mechanical pulling force (f) exactly using equilibrium statistical mechanics. Using analytically derived expression for the partition function we determine the phase diagram for the model in the f-temperature (T) plane. A square root singularity in the susceptibility indicates a second order phase transition from a fo...

A class of binary mixtures of Janus fluids formed by colloidal spheres with the hydrophobic hemispheres constrained to point either up or down are studied by means of Gibbs ensemble Monte Carlo simulations and simple analytical approximations. These fluids can be experimentally realized by the application of an external static electrical field. The gas-liquid and demixing phase transitions in f...

In 1976 the North Pacific climate shifted, resulting in an average increase of the water temperature. In the Gulf of Alaska the climate shift was followed (i.e. early 1980s) by a gradual but dramatic increase in the abundance of groundfish species that typically prey on pre-recruitment stages of walleye pollock. In the present study we used a previously parameterized model to investigate the ef...

We present the detailed results of the investigation by X-ray diffraction of the photoinduced phase transition in the Tris(α-picolylamine)iron(II) Chloride-Ethanol complex. This system undergoes a two-steps spin transition between a high spin state at room temperature and a low spin state at low temperature. The intermediate phase consists of stripes of high spin and low spin molecules. The X-r...