Spin relaxation time of conduction electrons through the Elliot-Yafet, D’yakonov-Perel and Bir-Aronov-Pikus mechanisms is calculated theoretically for bulk GaAs, GaSb, InAs and InSb of both nand p-type. Relative importance of each spin relaxation mechanism is compared and the diagrams showing the dominant mechanism are constructed as a function of temperature and impurity concentrations. Our ap...

A simplified derivation for the ratio of macroscopic to microscopic relaxation times of polar liquids is based on the Mori–Zwanzig projection-operator technique, with added statistical assumptions. We obtain several useful forms for the lifetime ratio, which we apply to the dynamics of liquid water. Our theoretical single-molecule relaxation times agree with the second Debye relaxation times as...

Amorphous zirconium titanate thin films was prepared on Pt coated silicon substrates by pulsed excimer laser ablation technique at a very low substrate temperature of 200 3OOOC in 0 2 ambient. The temperature and frequency dispersion of dielectric permittivity was investigated on amorphous ZrTiO, thin films. These films exhibited a marked dielectric relaxation at temperatures 500 700 K in a fre...

A recently developed methodology for the calculation of the dynamic heat capacity from simulation is applied to the east Ising model. Results show stretched exponential relaxation with the stretching exponent, beta, decreasing with decreasing temperature. For low temperatures, the logarithm of the relaxation time is approximately proportional to the inverse of the temperature squared, which is ...

Spatial regulation of cell differentiation in embryos can be provided by morphogen gradients, which are defined as the concentration fields of molecules that control gene expression. For example, a cell can use its surface receptors to measure the local concentration of an extracellular ligand and convert this information into a corresponding change in its transcriptional state. We characterize...

The dielectric properties of Mn-doped ZnO ceramics with electrically active grain boundaries at low temperatures of 10–70 K were investigated by admittance spectroscopy. It was observed that the dielectric relaxation of the main shallow donors, zinc interstitial, in these samples occurred in the temperature range of 20–50 K. Based on theoretical analysis, an expression for the admittance of an ...

Quantifying T2 and T ∗ 2 relaxation times from MRI becomes a standard tool to assess modifications of biological tissues over time or differences between populations. However, due to the relationship between the relaxation time and the associated MR signals such an analysis is subject to error. In this work, we provide a Bayesian analysis of this relationship. More specifically, we build poster...

We have investigated heat and mass transport in singlewalled carbon nanotubes (SWNTs) using molecular dynamics methods. Particular attention was paid on the non-equilibrium dynamics at the interface between SWNT and other materials, which strongly manifests in nanoscale. In the first part, we have investigated the heat transport through the interface between SWNTs and surrounding argon matrices...

We study thermal convection in a colloidal glass of Laponite in formation. Low concentration preparation are submitted to destabilizing vertical temperature gradient, and present a gradual transition from a turbulent convective state to a steady conductive state as their viscosity increases. The time spent under convection is found to depend strongly on sample concentration, decreasing exponent...

A single relaxation time model is used to describe the kinetics of enthalpy relaxation of glassforming systems subjected to a temperature modulated cooling or heating. There are two time scales of the measurement, a short one fixed by the modulation frequency and a slow one, determined by the average heating or cooling rate. It is demonstrated that the maximal respond of the system appears when...