Nowadays, utilisation of Nano-materials as one of the most recent methods of bitumen modification has attracted attention of many researchers. However, not enough research has been pursued on their mixing with bitumen, because of their dimensions and specific properties. In this study, the carbon Nano-tubes were mixed with bitumen using different mixers and some images were recorded employing a...

We are currently exploring ways to improve the performance of SIS mixers above 700 GHz. One approach is to use NbTiN in place of Nb for all or some of the mixer circuitry. With its high gap frequency and low losses demonstrated up to 800 GHz, it should be possible to fabricate an all-NbTiN SIS mixer with near quantumlimited noise performance up to 1.2 THz. Using a quasioptical twin-slot two-jun...

This paper presents the research on a 220 GHz multi circuit inte-grated front end based solid-state circuits. integrated integrates subharmonic mixer, 110 tripler, 8 dB hybrid coupler and waveguide bandpass filter (BPF) in one single block. Compared to traditional transceivers which usually use cascade connection of independent mixers multipliers, size proposed front-end block is 25 mm × 20 mm,...

Henrik Hautop Lund John Hallam Wei-Po Lee Department of Artificial Intelligence University of Edinburgh, 5 Forrest Hill, Edinburgh EH1 2QL, Scotland, UK [email protected] [email protected] [email protected] http://www.dai.ed.ac.uk/staff/Henrik Lund.html Abstract—True evolvable hardware should evolve whole hardware structures. In robotics, it is not enough only to evolve the control circuit...

A novel GaAs based Schottky diode fabrication process has been developed that enables increased design flexibility and robust implementation of monolithic circuits well into the THz frequency range. The fabrication technique builds on the already demonstrated membrane technology for 2.5 THz mixers [1, 2]. Realizing that the small size of the active devices at these frequencies might not require...

As for all materials, the performance of concrete is determined by its microstructure. Its microstructure is determined by its composition, its curing conditions, and also by the mixing method and mixer conditions used to process the concrete. This paper gives an overview of the various types of mixing methods and concrete mixers commercially available used by the concrete industry. There are t...

this paper presents a design of an uwb downconversion integrated cmos resistive ring mixer with linear voltage regulator (lvr), to supply required biasing voltages for the mixer section. the designed mixer circuit has been optimized for using in heart rate extraction system with microwave doppler radar at 2.4ghz frequency. this mixer needs 2 dc bias voltages equal to 0.5 and 1 volts for its bes...

In this study, two different types of 90-degree hybrid mixers were designed and analyzed in an ISM (industrial, scientific, and medical) 2.4 GHz band. The first is a general type; the other, a low-distortion type. For the low-distortion type, the 1-dB compression point and the third interception point are increased about 3-dB. The proposed mixers have a major shortcoming with a significant pena...

A regression model for simulating residence time distribution (RTD) of turbulent flows in helical static mixers is proposed and developed to predict the residence time distribution in static mixers. An efficient method is required to estimate the RTD and the sole means of achieving this is through detailed regression model. The RTD was calculated numerically by regression model. The results of ...

AbstructWe report on the development of low-noise quasioptical SIS mixers for the frequency range 400-850 GHz. The mixers utilize twin-slot antennas, two-junction tuning circuits, and Nb-trilayer junctions. Fourier-transform spectrometry has been used to verify that the frequency response of the devices is well predicted by computer simulations. The 400-850 GHz frequency band can be covered wit...