erosion by wind is one of the most important factors in desert environment. prevailing winds can shift sand dunes and affect their accumulation. also, wind regime determines the direction of sand dune mobility. the aim of this research was to investigate sand drift potential using sand movement models. for this research, wind data between 1986 and 2005 from the meteorological station of yazd we...

the necessity to use pesticides in agriculture, provides environmental pollution at the same time, and significant part of the agri-economy is allocated to this reseon. therefore, it is important issues to use of pesticides, with the highest degree of effectiveness and minimal loss. in this study, electrostatic spraying and its functional factors were evaluated. the applied experimental design ...

Rotablation (rotational atherectomy) is an acknowledged method of percutaneous treatment of highly calcified coronary artery lesions that cannot be treated with traditional angioplasty. The complexity of the technique and usage of very specific equipment can contribute to the development of uncommon complications. We present a case of percutaneous retrieval of a damaged rotational atherectomy b...

We study the nonlinear dynamics of single-domain ferromagnetic nanoparticles in a viscous liquid induced by harmonically oscillating gradient magnetic field absence and presence static uniform field. Under some physically reasonable assumptions, we derive coupled set stiff ordinary differential equations for magnetization angle particle coordinate describing rotational translational motions nan...

We study both the classical and quantum rotational dynamics of an asymmetric top molecule, controlled through three orthogonal electric fields that interact with its dipole moment. The main difficulties in studying controllability these infinite-dimensional systems are presence severe spectral degeneracies drift Hamiltonian nonsolvability stationary free Schrödinger equation, which lead us to a...

In statistics it is often assumed that sample observations are independent. But sometimes in practice, observations are somehow dependent on each other. Spatiotemporal data are dependent data which their correlation is due to their spatiotemporal locations.Spatiotemporal models arise whenever data are collected across bothtime and space. Therefore such models have to be analyzed in termsof thei...

Among various practical measures used for restriction of the ground surface settlement in such tunnels driven in soft ground, selection of an appropriate excavation method plays a significant role. In this paper, employing suggested diagram by Yu & Chern, corresponding values of Niayesh tunnel has been inserted into the diagram. Later, two excavation methods namely: central diaphragm and side d...

In this study, the seismic inter-story drift of structures is estimated by a combination of mode-acceleration equations with the modelling of high-rise buildings with flexural and shear cantilever beams. In the equation presented for calculating the inter-story drift, having less knowledge of the building is adequate and this issue is of significance in estimating the nonstructural component fo...

Abstract We report on the pulse-to-pulse energy distribution and longitude-resolved modulation properties of PSR J1631+1252 discovered by Five-hundred-meter Aperture Spherical radio Telescope. Our analysis made use data acquired at 1250 MHz from follow-up timing observations that lasted over a year. has rotational period ∼0.310 s, dispersion measure ∼32.73 pc cm −3 . The is well described logno...