We are developing THz-QCL (quantum cascade laser) as a local oscillator for heterodyne receivers. THz-QCLs are made of GaAs/Al0.15Ga0.85As using resonant LO phonon scattering depopulation scheme, and processed in a metal-metal waveguide using gold-gold thermo compression wafer bonding technique. CW mode operation of the THz-QCL has been achieved up to a heat-sink temperature of 74 K at the lasi...

A 2.4 GHz low-power, low-noise and highly linear receiver front-end with a low noise amplifier (LNA) and balun optimization is presented. Direct conversion architecture is employed for this front-end. The on-chip balun is designed for single-to-differential conversion between the LNA and the down-conversion mixer, and is optimized for the best noise performance of the front-end. The circuit is ...

Tunable, coherent radiation in the ultraviolet region has been generated by stimulated Raman scattering, by anti-Stokes Raman lasers, and by frequency-mixing processes based on nonlinear polarizabilities of atomic and molecular systems. Present progress in the development of these laser-driven sources is reviewed, with examples of available systems and their characteristics. Applications in spe...

The processes to form the compositions of loose materials in centrifugal mixers continuous action have been considered. Based on method discrete elements, a mathematical model movement particles rotor mixer was built, taking into consideration their geometric and physical-mechanical parameters. To assess extent influence these parameters nature particle movement, well-known system differential ...

The scaling of the CMOS technologies has a great impact on analog design. The most severe consequence is a reduction of the voltage supply. In this article, a new low-voltage folded-switching mixer with current-reuse, which operates at 1 V supply voltage, is discussed. The main advantages of the introduced mixer topology are: a high voltage gain, a low noise figure, an operation at low supply v...

We have applied an optimization method in conjunction with numerical simulations to minimize the mixing time of a microfluidic mixer developed for protein folding studies. The optimization method uses a semideterministic algorithm to find the global minimum of the mixing time by varying the mixer geometry and flow conditions. We describe the minimization problem and constraints and give a brief...

We report on the design and performance of a 530-GHz balanced SIS mixer, the first balanced mixer in this frequency range. This quasi-optical balanced mixer utilizes a cross-slot antenna on a hyperhemispherical substrate lens with eight superconductor–insulator–superconductor (SIS) junctions and a 180 lumped element IF hybrid circuit. The local oscillator (LO) and the radio frequency (RF) signa...

The mapping approach is applied to study the distributive mixing in the, widely industrially used, Kenics static mixer. The flexibility of the mapping method makes it possible to study and compare thousands of different mixer layouts and perform optimization with respect to macroscopic homogenization efficiency and interface generation. In the paper two different designs of the mixer are invest...

The problem of separating Java code and HTML code in Servlet programming is not yet completely solved since the existing tentative solutions either are too complex or not complete. We present Mixer which is a novel helper tool based on a template engine design philosophy to solve this problem. Mixer is easy to learn and to use. Mixer is also computationally very efficient. We have already teste...