A polymer electrolyte membrane fuel cell with amorphous hydrated ruthenium dioxide (RuO2 " xH2O) supercapacitative sublayers inserted between the electrocatalyst layers and the Nafion membrane was fabricated to enhance the cell’s pulse power output. RuO2 " xH2O material showed a high capacitance ~ca. 230 F/g! and allowed a much higher pulse power output, which was demonstrated by cyclic voltamm...

Two powerful and distortionless peak power reduction schemes for Orthogonal Frequency Division Multiplexing (OFDM) are compared. One investigated technique is selected mapping (SLM) where the actual transmit signal is selected from a set of signals and the second scheme utilizes phase rotated partial transmit sequences (PTS) to construct the transmit signal. Both approaches are very flexible as...

This paper presents a procedure for inserting test points at the outputs of scan elements of a full-scan circuit in such a manner that the peak power during scan testing is kept below a specified limit while maintaining the original fault coverage. If the power in a clock cycle during scan testing exceeds a specified limit (which depends on the peak power the chip has been designed to supply), ...

This study investigated the differences in short-term power output (STPO) using three different cycle ergometers in 9-year-old children. A total of 31 children participated in three cycle ergometer sprint tests of 20 s duration: a modified friction braked Monark, a modified friction braked Ergomeca cycle ergometer, and a SRM isokinetic ergometer. Common indices of peak and mean power, peak peda...

The smart grid is a future power network capable of making the power system more intelligent taking advantage of sophisticated information technologies and two-way communication. The information technology allows efficient demand side management which reshapes the power consumption by scheduling the operation of electric devices and equipments in smart homes, buildings, farms, and the like. The...

High peak to average power ratio of the transmit signal is a major drawback of OFDM systems. After defining the PAPR and analyzing its statistical properties, some of the most representative PAPRreduction techniques available in the literature are reviewed in detail. Several methods have been proposed to reduce the peak power of OFDM signals. In this paper the effectiveness of some recently pro...

We report the experimental observation and theoretical analysis of a novel beam-steering effect in periodic waveguide arrays that arises from the interplay between discrete diffraction, Kerr nonlinearity and any mechanism that effectively weakens the nonlinear part of the beam. In this regime the propagation direction shows increased sensitivity to the input angle and for a certain angular rang...

Acknowledgement This master thesis is defined by ArrayComm company in U.S, California, San Jose. The project is a collaboration between the company and Chalmers. I would like to show my gratitude to certain people: Dr. Thomas Svantesson from ArrayComm-for giving me this opportunity and also your great guidance and help during the project. Professor Mats Viberg-for introducing me to the right pe...

MC-CDMA has attracted significant attention as one of the down link communication method for fourth generation mobile communication systems. However, MC-CDMA has a peak power problem as well as the other non-spread multi-carrier systems. In this paper, we propose novel peak power reduction technique for MC-CDMA using code selection at the transmitter. In the proposed system, the transmitter sel...

This paper presents a novel microwave-assisted hydrothermal technique for synthesizing tin(II) oxide nanoparticles. This technique can be used for producing large quantities of homogeneous nanoparticles in a short time. The effect of the solution molarity, final pH, hydrothermal processing time and microwave power were studied. The tin(II) oxide structure verified from XRD...