A discrete-time mixing architecture for software defined radio receivers is proposed. It exploits 8x RF voltage oversampling followed by charge domain weighting to achieve 40dB 3rd and 5th harmonic rejection without channel bandwidth limitations. Also noise folding is reduced by 3dB. A zero-IF downconverter chip in 65nm CMOS can receive RF signals up to 900MHz, with NFmin=12dB, IIP3=11dBm at <2...

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...

  ; 1 X i  i is a strictly stationary Gaussian sequence which has a bounded positive every t, then 1 1 1 m M        ; 1 n X n  . Thus, is a  -mixing sequence.  -mixing is similar to  -mixing, but both are quite different.   k  is defined by (1.1) with index sets restricted to subsets S of   1,n T and subsets of   , , , n k n k N   . On the other hand,   -mixing sequen...

This paper reports a new low-cost passive microfluidic mixer design, based on a replication of identical mixing units composed of microchannels with variable curvature (clothoid) geometry. The micromixer presents a compact and modular architecture that can be easily fabricated using a simple and reliable fabrication process. The particular clothoid-based geometry enhances the mixing by inducing...

A new index, the estimate of the error variance, which can be used to quantify the evolution of the flow patterns when multiphase components or tracers are difficultly distinguishable, was proposed. The homogeneity degree of the luminance space distribution behind the viewing windows in the direct contact boiling heat transfer process was explored. With image analysis and a linear statistical m...

A control law to improve jet flow mixing is presented. The control law employs a pair of actuators at the jet nozzle exit that act on the shear layers near the corners by blowing and subtracting fluid in an anti-symmetric fashion and a sensor downstream or at the nozzle exit with a time delay that measures the pressure difference across the nozzle diameter. A 2-D jet flow is numerically simulat...

In this paper we investigate mixing and transport in correspondence of a meandering jet. The large-scale flow field is a kinematically assigned streamfunction. Two basic mixing mechanisms are considered, first separately and then combined together: deterministic chaotic advection, induced by a time dependence of the flow, and turbulent diffusion, described by means of a stochastic model for par...