the use of accelerated temperature stability studies using the arrhenius relationship is routine for estimating the stability of a drug at room temperature. therefore, the acceleration method is used to determine the expiration date of dexamethasone aqueous formulation manufactured in iran. a high-performance liquid chromatography (hplc) method utilizing ultraviolet (uv) detection for dexametha...

Ionic conductivity and molar volume measurements were performed on H(2)O ice at high pressure (P) and temperature (T) in a resistive-heated diamond anvil cell. The conductivity data obtained at P = 20-62 GPa, T = 304-930 K are well fitted with a single Arrhenius equation. Isothermal volume measurements at T = 873 K, P = 30-101 GPa indicate that H(2)O ice undergoes phase transitions at P = 50 GP...

This article reports a study on the dielectric relaxation processes of Cd2Nb2O7 compound. Three dielectric relaxation modes I, II, and III were reexamined. By using the Cole–Cole equation fitting of the frequency dependence of dielectric constant and loss, we obtained more precise relaxation time data, compared to the data reported in the literature. The results indicate that the relaxation tim...

The microscopic origin of glass transition, when liquid viscosity changes continuously by more than ten orders of magnitude, is challenging to explain from first principles. Here we describe the detailed derivation and implementation of a Markovian Network model to calculate the shear viscosity of deeply supercooled liquids based on numerical sampling of an atomistic energy landscape, which she...

A mixed potential model (MPM) comprising the Point Defect Model (PDM) and Generalized Butler Volmer Equation (GBVE) was successfully developed to study passivity of HDSS 2707. The results show that dominant point defect within passive film is Min+, thereby rendering n-type semiconductor behavior barrier layer. anodic current independent formation whereas it increases with increasing temperature...

We report a systematic study of the effects of the external force F on the nonequilibrium steady-state (NESS) dynamics of the diffusing particles over a tilted periodic potential, in which detailed balance is broken due to the presence of a steady particle flux. A tilted two-layer colloidal system is constructed for this study. The periodic potential is provided by the bottom-layer colloidal sp...

This research investigated how the variation of temperature and shear rate affects viscosity ethanol gel propellants that use methyl cellulose as gellant and, in parts, boron energetic additive. Using a rotational viscometer cone-and-plate configuration, propellant data was recorded across range temperatures applied rates. The temperaturedependence modelled using an Arrhenius-type equation. For...

Drying allows water to be removed and food preserved, however, this operation can degrade color. Punamuña leaves are aromatic used for medicinal purposes in the Peruvian Andes. This research aimed determine model drying kinetics, diffusivity coefficient (Def), activation energy (Ea), color of punamuña leaves. A horizontal dryer was at 40, 50, 60 °C airspeed 1.0 0.5 m / s; kinetics modeled with ...

Viscosity, a key property for glass processing, is a function of glass composition and temperature. Nuclear waste glasses must be formulated to obtain a desired viscosity at the melter processing temperature for each waste composition to be vitrified. Over the past decades, a large viscosity database has been accumulated at various laboratories in the US. The database, compiled at the Pacific N...

Coal is a combustible material applicable to a variety of oxidation scenarios with conditions ranging from atmospheric temperature to ignition temperature. One of the most frequent and serious causes of coal fires is self-heating or spontaneous combustion. Opening an underground coal seam to mine ventilation air, such as long-wall gob and goaf areas and coal stockpiles, creates a risk of sponta...