To develop a 3-D imaging synthetic aperture radar(SAR) algorithm, theoretical expression for Fourier transform of data cube is required. In this article, we introduce function representing the SAR cube. The derived using method stationary phase and similar to one used 2-D matrix. For verification evaluation, range migration algorithm bulk compression examined. simulation results based on parame...

Neighborly cubical polytopes exist: for any n ≥ d ≥ 2r + 2, there is a cubical convex d-polytope C d whose r-skeleton is combinatorially equivalent to that of the n-dimensional cube. This solves a problem of Babson, Billera & Chan. Kalai conjectured that the boundary ∂C d of a neighborly cubical polytope C n d maximizes the f -vector among all cubical (d− 1)-spheres with 2 vertices. While we sh...

Using the electric and coupling approaches, we derive a series of results concerning the mixing times for the stratified random walk on the d-cube, inspired in the results of Chung and Graham (1997) Stratified random walks on the n-cube. Random Structures and Algorithms, 11,199-222.

It is important to study joint contact mechanics in order to understand the human joint function and degeneration. In previous studies, the cartilage behavior was investigated using computational method assuming the cartilage to be flat and an ideal thickness. But, this assumption may not appropriate because the joint is naturally curved and the cartilage thickness varies across the articular c...

We are developing a finite element program for oil and gas reservoir simulation based on Biot’s poroelastic theory, where a simultaneous solution is sought for both the pore pressure and strain in the solid phase. Several 2-D and 3-D cases are presented, which are compared with analytical solutions for verification of this approach. We have also applied this method to simulate surface subsidenc...

In this paper, by combining with the network structures of the twisted n cube and the crossed cube, the counterchanged crossed cube network is proposed, a rigorous recursive definition is made, and the network topology structure graph is offered. Basing on the definition of the counterchanged crossed cube, this paper also analyzes the basic properties of the network, proves that the network is ...

An idealised, staggered array of 9 6m 3 cubes was built to gain an understanding of the influence of other buildings on the natural ventilation rate of a building. The instrumented cube contained 24 temperature measurements, 32 surface pressure taps, CO2 sensors and 2 sonic anemometers, with 5 more placed outside to measure wind velocities. Ventilation rate was measured when the cube was sealed...

Carbonate reservoirs rock typing plays a pivotal role in the construction of reservoir static models and volumetric calculations. The procedure for rock type determination starts with the determination of depositional and diagenetic rock types through petrographic studies of the thin sections prepared from core plugs and cuttings. In the second step of rock typing study, electrofacies are deter...

morphological and morphometric characters of two species of superfamily sphaerularioidea, recovered in southwestern iran namely deladenus durus and prothallonema obtusum are given. the recovered specimens of d. durus are characterized by having a valvular chamber in metacorpus and excretory pore posterior to the hemizonid.the iranian population of p. obtusum is characterized by having four line...