digital elevation model (dem) is increasingly used these days as an effective tool to extract elevation data in quantitative environmental and land management studies. the improvement of sensors and land resource satellites has made it possible to generate dem from remotely sensed data. dems which are produced from these data are applied not only in the two dimensional (2d) but also in the thre...

Simulations of gas-solid fluidized beds have been performed using a hybrid simulation method, which couples the discrete element method (DEM) for particle dynamics with the averaged two-fluid (TF) continuum equations for the gas phase. The coupling between the two phases is modeled using an interphase momentum transfer term. The results of the hybrid TF-DEM simulations are compared to experimen...

Most flood inundation models do not come with an uncertainty analysis component chiefly because of the complexity associated model calibration. Additionally, fact that are both data- and compute-intensive, since results from multiple sources, adds another layer for use. In present study, modeling was performed in Godavari River Basin using Hydrologic Engineering Center—River Analysis System 2D ...

This paper will discuss an invented approach which focuses on providing an output from registration of an aerial photograph on a 3D model such as DTM, DMS, or 3D model. The approach has been developed in order to omit distortions from output and to increase the reliability. In contrast of other image registration methods which their outputs are an image, this approach provide a 3D model which c...

This paper provides a prediction of the achievable interferometric performance for a TerraSAR-L cartwheel constellation. Assuming receiving antennas of only 3m diameter, ambiguity and noise floor levels are analysed in detail. Expected DEM accuracies for different effective baselines at different swath positions including effects of local slope and volume decorrelation over vegetation are prese...

this paper tries to analyze the impacts of intermediate goods trade on production, consumption, investment, net exports, employment, labor wage and capital rent of iran in its bilateral trade relations with china. this analysis has been done by modeling, solving and calibrating an international real business cycles (irbc) model in period 1980-2009. the results show that when elasticity of subst...

The TanDEM-X mission is a German dual satellite formation with the task to acquire a global digital elevation model (DEM) by bistatic interferometric synthetic aperture radar (SAR) data takes. Therefore the two satellites are kept in a close helixformation with a distance of less than 1 km. In order to reach the intended DEM accuracy, the baseline vector between the two spacecraft needs to be d...

Ballast rheology is a phenomenon that describes movements of ballast particles due to the discrete nature, which eventually leads bed fluid deformation after long-time service. In most cases, main reason track irregularity some defects, e.g., hanging sleeper and mud spots. Therefore, it significant confirm mechanism, not only benefits for alleviating prolonging service providing safe transporta...

In discrete element method (DEM) simulations, accurate simulation parameters are very important. For ellipsoidal soybean seed particles, the rolling friction coefficient between particles (RFCP-P) and coefficients particle boundary (RFCP-B) difficult to measure experimentally therefore need be calibrated. this paper, of three varieties with different sphericities were taken as research objects....