iran’s vast common natural gas resources and the necessity to extract and export it as liquefied natural gas (lng) to distances more than 3000km opens a lucrative field for researchers to optimize lng cycles. in this article heat integration in cryogenic cycles by determining interacycle partition temperature and optimizing refrigeration features like subcooler, presaturator, aftercooler, reboi...

A method is proposed for calculating the spectral characteristics of cascade long-period fiber gratings refractive index core based on partial regions and decomposition. According to method, structure represented as a connection basic inhomogeneities, each which junction several optical fibers with different dielectric geometric parameters. Approbation was carried out by reducing single grating...

An unsteady two-dimensional numerical investigation was performed on the viscous flow passing through a multi-blade cascade. A Cartesian finite-volume approach was employed and it was linked to Van-Leer's and Roe's flux splitting schemes to evaluate inviscid flux terms. To prevent the oscillatory behavior of numerical results and to increase the accuracy, Monotonic Upstream Scheme for Conservat...

We study numerically how the intercellular conductance affects the process of spiral breakup in an array of coupled excitable cells. The cell dynamics are described by the Aliev-Panfilov model, and the intercellular connection is made via Ohmic elements. We find that decreasing intercellular conductance can prevent the breaking up of a spiral wave into a complex spatiotemporal pattern. We study...

This article presents a ground breaking traction drive for fuel cell-powered light rail vehicles based on multilevel cascade converter with H-bridge cells. The provides dc–ac power conversion unique buck–boost capability to compensate the variation of cell terminal voltage load power. In comparison conventional boost inverter, connection dc–dc and source proposed has significant benefits much s...

This paper presents the analysis, design and simulation of DC distributed power supply controlled with energy balance control technique. The proposed system consists 5 connection structures to converters which are parallel, cascade, source splitting, load stack. mathematical model is analyzed by average small-signal method. technique used in instance where main sources system. case that at 24 V...

A simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of Resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. We found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency THz QCLs.In low frequenc...

Abstract A unified theory of zonal flow shears and density corrugations in drift wave turbulence is presented. Polarization advection beat excitation are studied combination with modulational response. Noise driven by two-time flux correlation. While the effective eddy viscosity can go negative, diffusivity positive definite. There no inverse cascade corrugation. The connection between avalanch...