many real devices such as batteries are nonlinear and their impedance values depend on either current or voltage. However, impedance analysis is based on the assumption of a linear system. If certain conditions such as sufficiently small excitation amplitude to ensure quasi-linearity and measurements at several operating points are fulfilled, also the impedance of a nonlinear system can be inte...

In this paper, we propose a mechanical impedance for the whole arm of a serial-chain manipulator. The proposed impedance has a geometrically natural property owing to use of a spatial curve which describes a virtual reference of the impedance. The proposed impedance is useful for geometric task planning in whole-arm manipulation. Illustrative examples are shown for understanding of the impedance.

OBJECTIVE Mitral regurgitation (MR) is generally characterised as exhibiting a 'low impedance leak into the left atrium'. This notion is widely accepted without measured impedance data. The aim of this study was to define the impedance to retrograde and forward blood flow and to examine hydraulic (pressure-volume) and mechanical (stress-shortening) function in chronic severe MR. METHODS A mat...

We report the demonstration of an all-optical, bias free and error-free (bit-error-rate ~10(-12)), 10 Gbit/s non-return-to-zero (NRZ) to return-to-zero (RZ) data format conversion using a 7.5 µm diameter III-V-on-silicon microdisk resonator. The device is completely processed in a 200 mm CMOS pilot line. The data format conversion is based on the phenomenon of pulse carving of an NRZ optical da...

In many applications such as TDMA cellular telephone, OFDM, Bluetooth, Satellite communication etc. QPSK digital modulation technique is used due to its higher bandwidth efficiency, higher noise immunity and simpler circuit. Simpler circuit is having lower cost, smaller size and lower power dissipation. In this paper a new circuit for QPSK modulator is designed which improves the area of the ci...

Performance Evaluation Of Fuzzy Logic Controlled Bidirectional DC to DC Convertor Written by Administrator Wednesday, 16 March 2011 08:49 Last Updated Monday, 21 March 2011 07:38 This paper presents the systematic design procedure of fuzzy logic controller for the coupled inductor bidirectional DC-DC converter. The converter contains nonlinear elements making the mathematical model more complex...

In this paper an optimized hardware co-simulation approach is presented to design & implement GSM based digital down convertor for Software Defined Radios. The proposed DDC is implemented using optimal equiripple technique to reduce the resource requirement. A computationally efficient polyphase decomposition structure is used to improve the hardware complexity of the overall design. The propos...

manufacturing industries of agricultural products, which constitute a considerable part of different countries’ economies, are seeking new profitable opportunities by increasing competition at the international level. organizational agility is new method and philosophy of production that seeks to react effectively to the variable and unpredictable environment and to utilize the changes as chanc...