a digital look-up table adaptive predistortion technique using a six-port receiver for power amplifier linearization is presented. the system is designed in ka-band for a dvb-s2 satellite link. we use a six-port receiver at the linearizationloop in place of classic heterodyne receivers. the six-port receiver is implemented by the use of passive microwavecircuits and detector diodes. this approa...

the globalization and urban development concepts are closely linked to each other. however, all cities around the world are not affected same by globalization, each one has its spatial and reciprocal international-local action. the international changes of economy, culture, and politics have huge effects on restructuring of cities around the world. the present study as a descriptive-analytical ...

Background: Laparoscopic Surgery (LS) may be associated with many port site complications such as hernia, bleeding, infection, subcutaneous emphysema and ugly scars. Some of these complications are serious such as obstructed port site hernia . Rate of these complications is low depending  on size and site of the port incision, type of the trocar that it is used, the condition of  the patient a...

We report a new and simple design of a fully automated dual-online ultra-high pressure liquid chromatography system. The system employs only two nano-volume switching valves (a two-position four port valve and a two-position ten port valve) that direct solvent flows from two binary nano-pumps for parallel operation of two analytical columns and two solid phase extraction (SPE) columns. Despite ...

External SDD systems can also replace Si(Li) detectors on existing microscopes and offer many of the advantages of the in-situ SDD systems. Since the SDDs do not operate at liquid nitrogen temperatures, the insulation gaps in the nosepiece/collimator assemblies can be reduced or eliminated. Also, the detector window and the associated support frame are no longer used. This means that the detect...

The oblivious edge-disjoint routing in the directed binary de Bruijn network is considered on the basis of the all-port model. Packet burst switching is used to establish tight permutation routing. Permutation circuit switching within the all-port model is demonstrated with the use of multi-wavelength routing. Tight multi-plane routing is established for physical paths of lengths limited to the...