Some systems interact with their environment at physically distributed interfaces, called ports, and in testing such a system it is normal to place a tester at each port. Each tester observes only the events at its port and it is known that this limited observational power introduces additional controllability and observability problems into testing. Given a multi-port finite state machine (FSM...

This paper presents a new nonlinear passivity-based controller for a wound rotor synchronous machine, acting as a motor drive. The control objectives are stated in the dqframe, and the port-controlled Hamiltonian model is also obtained. A power flow analysis allows to state the control goals in terms of reactive power compensation and ohmic losses reduction. From the Hamiltonian structure, the ...

In this paper, the mechanical structure of a hexapod walking robot is presented and the kinematic model is established. The foot trajectory of each leg, which is optimized by genetic algorithms to minimize energetic cost, was proposed with two different gait patterns applied. Control system was divided into coordination-layer and execution-layer. Coordination-layer, was a PC responsible, for wh...

The technology of intravenous catheter access ports has evolved from open ports covered by removable caps to more-sophisticated, closed versions containing mechanical valves. We report a significant increase in catheter-related bloodstream infections after the introduction of a new needle-free positive-pressure mechanical valve intravenous access port at our institution.

A new blood access system for hemodialysis (HD) addresses the major shortcomings of current accessing techniques and helps overcome patient adversity with available choices. The system uses new methods, devices and compositions comprising several novel elements: (1) totally implanted port, elementally simple in design, small and robust with improved safety features, (2) engineered transcutaneou...

This study attempts to search for the combination of the back pressure port size and its location which results in minimum mechanical losses and yet providing sufficient axial sealing. Theoretical study employing a mathematical model coupled with numerical optimisation algorithm predicted that a reduction of 9% in mechanical losses can be achieved. The main cause of gain that resulted in such a...

An omnidirectional dual-polarized slot antenna with high port isolation for 2.4-GHz wireless local area network (WLAN) applications is proposed in this paper. The omnidirectional radiation patterns of the vertical polarization (VP) and horizontal polarization (HP) are achieved by individually cutting two orthogonal slots onto the metal walls of a cuboid antenna. The overall volume of the compac...

With the development of rural power market in our country, how to improve the operation more correctly and timely of power quantity collection, transmission and processing becomes a problem. The requirement of equipment in power quantity collection needs new and higher demands. The advantage of using dual-port RAM and main-spare CPU structure, when main CPU running, spare CPU supply monitoring ...

Dual polarized antennas are traditionally characterized in terms of port-to-port isolation and coand cross-polar radiation patterns. In this paper we instead identify the critical parameter when the antenna is used as a sensor in a polarization diversity reception system. This turns out to be the fareld coupling between the two channels. We calculate the antenna output power correlation and div...