in the present study, natural convective heat transfer in a partitioned square cavity utilizing nanofluids is studied. the vertical left and right walls are considered as the hot and cold walls, respectively and the partitions assumed to be adiabatic. the nanofluid used in this study is al2o3 with the volume fraction of 20%. it is assumed that nanofluid is a single phase fluid. fluent 6.3.26 is...

The classical Rayleigh quotient iteration (RQI) allows one to compute a one-dimensional invariant subspace of a symmetric matrix A. Here we propose a generalization of the RQI which computes a p-dimensional invariant subspace of A. Cubic convergence is preserved and the cost per iteration is low compared to other methods proposed in the literature.

This paper reveals a previously-unknown infinite linear combination of Gamma distributions with simple coefficients for the symbol-detection signal-to-noise ratio (SNR) in multiple-input/multiple-output (MIMO) communications employing spatial multiplexing and zero-forcing detection (ZF), whereby the intended (detected) and interfering symbol streams experience correlated Rician and Rayleigh fad...

it has been proved that natural frequencies are stationary at the natural modes. also it has been shown that at the first mode it is a minimum and for systems with finite number of degrees of freedom the highest frequency is maximum (reference 1 and 2). beyond these statements nothing more can be said about the behavior of the natural frequencies without defining precisely the manner in which t...

Solutions of LiCl and of NaCl in ultrapure water were studied through Rayleigh/Brillouin scattering as a function of the concentration (molarity, M) of dissolved salt from 0.2 M to extremely low concentration (2 × 10(-17) M). The Landau-Placzek ratio, R/B, of the Rayleigh scattering intensity over the total Brillouin was measured thanks to the dynamically controlled stability of the used Fabry-...

Images of urban Japan taken vertically through a 180° fisheye lens were analyzed to derive, as a function of elevation the fraction of sky that is clear, shadowed by trees, or blocked by buildings. At 32° elevation, results match those derived from satellite measurements fit to a 3-state fade model. Using the same model, for the first time the elevation angle dependence of mobile satellite fadi...

Rayleigh-Bénard convection is numerically simulated in twoand three-dimensions using a recently developed two-component lattice Boltzmann equation (LBE) method. The density field of the second component, which evolves according to the advection-diffusion equation of a passive-scalar, is used to simulate the temperature field. A body force proportional to the temperature is applied, and the syst...

Rayleigh-Bénard-Marangoni instability in a bilayer system of self-rewetting fluid overlying porous medium is investigated. The upper surface the layer assumed non-deformable and constant temperature gradient imposed. Unlike previous works, considered this paper, whose tension quadratic function temperature. As result, it would reinforce or suppress caused by buoyancy different scenarios. Thorou...

The paper outlines a probabilistic basis for the automatic estimation from observed surface wave dispersion of structural model parameters with uncertainties. Given an earth model, a wave type and pertinent parameter values, the group velocity of seismic waves can be computed from theory as a function of frequency. Such a function may also be based on the dynamic spectrum representation of an e...

Following a unified analytical framework, the bit error rate (BER) of several coherent and non-coherent binary modulation schemes are derived for a switched diversity system. The two variants of switched combining (SWC) that have been investigated are switch and stay combining (SSC) and switch and examine combining (SEC). For channel modelling, at first a simple slow flat fading channel is assu...