We tested whether and to what extent a remote sensing net primary productivity (NPP) estimation model based on the moderate resolution imaging spectroradiometer (MODIS) data and GIS modelled shortwave radiation can be used to estimate NPP in a Southern African Savanna landscape. To accomplish this, we compared the results of our model with results obtained using an established rainfall-NPP regr...

the angle of repose of soil particles is an important factor for determining critical shear stress for initiation of soil particles motion during the erosion process. there are different methods for measuring the angle of particle repose and the result of each method is somewhat different from those of the others. sliding and fixed-base piling methods are the two most common methods in the lite...

in this research between 3-dimensional and axisymmetric modeling for movement of nano-particles in passing through a aerodynamic lens, and also between these models and famous model of wang & liu was compared. for this purpose, output of nano-particles penetration, divergence angel, and nano-particle velocity with wang & liu model was compared. geometrical model used for aerodynamic lens compar...

Considering light transport in disordered media, the medium is often treated as an effective requiring accurate evaluation of refractive index. Because its simplicity, Maxwell-Garnett (MG) mixing rule widely used, although restriction to particles much smaller than wavelength rarely satisfied. Using 3D finite-difference time-domain simulations, we show that MG theory indeed fails for large part...

A new laser flow cytometer, based on a laser source of polarized light irradiating microscopic particles, has been developed. The unpolarized and linearly polarized scattered light, as well as the side emitted light in different spectral bands, are measured, allowing the simultaneous and realtime determination of size, refractive index, light scattering depolarization and fluorescence of each p...

Based on the generalized Lorenz-Mie theory (GLMT), this paper reveals, for the first time in the literature, the principal characteristics of the optical forces and radiation pressure cross-sections exerted on homogeneous, linear, isotropic and spherical hypothetical negative refractive index (NRI) particles under the influence of focused Gaussian beams in the Mie regime. Starting with ray opti...