We show that in any graph, the average length of a flow path in an electrical flow between the endpoints of a random edge is O(log n). This is a consequence of a more general result which shows that the spectral norm of the entrywise absolute value of the transfer impedance matrix of a graph is O(log n). This result implies a simple oblivious routing scheme based on electrical flows in the case...

The dynamic model of a UAV with an attached robotic arm is derived in a symbolic matrix form through the Euler-Lagrangian formalism. A Cartesian impedance control, which provides a dynamic relationship between external generalized forces acting on the structure and the system motion, is then designed. The hovering control of a quadrotor, equipped with a 3-DOF robotic arm and subject to contact ...

The paper discusses aspects of a novel impedance matrix compressing technique and applies the technique to a coil-loaded monopole. The technique can reduce the number of variables required for modeling of structures with curvatures and structures with electrically small features. The reduction in the number of unknowns is accomplished by a logical aggregation/grouping of the individual wire seg...

A methodology is proposed and demonstrated for the direct passive synthesis of SPICE-compatible models of multi-conductor interconnect structures. The algorithm is based on a PadéChebyshev approximation of the frequency-dependent input impedance matrix of the passive interconnect system. Given the bandwidth of simulation, the length of the interconnect system, and its per-unit-length, frequency...

Diffraction of an electromagnetic plane wave from a slit in an impedance plane placed at the interface of two different media, has been formulated rigorously. Both the principal polarizations are considered. The method of analysis is Kobayashi Potential (KP). To determine the unknown weighting functions, boundary conditions are imposed which resulted into dual integral equations (DIEs). These D...

We have studied the relaxation and dephasing processes in a supercon-ducting quantum point contact induced by the interaction with an electromagnetic environment. Based on a density matrix approach we obtain the rates for the dissipative dynamics as function of the transmission, the phase difference on the contact and the external impedance. Our calculation allows to determine the appropriate r...

A new method for the determination of a distributed FET noise model is presented. It is based on the extraction of the intrinsic noise-correlation matrix of an elemental section of the device from the device’s noise figure, measured for only one source-impedance state at a number of frequency points. Experimental results up to 40 GHz are given. © 2004 Wiley Periodicals, Inc. Microwave Opt Techn...

In this paper a solution of combined field integral equation (CFIE) for electromagnetic scattering by an arbitrary shaped dielectric object is studied. We derive a novel CFIE formulation in which the electric and magnetic field integral equations (EFIE and MFIE) are combined in the usual manner outside the object. Inside the object CFIE is composed by changing the roles of EFIE and MFIE. In add...

The cavity of a particular electron accelerator is analysed thanks to boundary integral equations. Electrons are accelerated several times in the median plane of a single coaxial cavity resonating on its fundamental TEMj mode. The geometry of the conductors is modified to improve the shunt impedance. The proper frequency of the new resonator is calculated thanks to Green's function associated t...