Performance of wave-energy devices of the oscillating water column (OWC) type is greatly enhanced when a resonant condition with the forcing waves is maintained. The natural frequency of such systems can in general be tuned to resonate with a given wave forcing frequency. In this paper we address the tuning of an OWC seawater pump to polychromatic waves. We report results of wave tank experimen...

Recycled concrete aggregate (RCA) is a relatively new construction material, whose applications can replace natural aggregates. To do so, extensive studies on its mechanical behavior and deformation characteristics are still necessary. RCA is currently used as a subbase material in the construction of roads, which are subject to high settlements due to traffic loading. The deformation character...

In this paper two low-cost PC-AT compatible boards, specially developed for completely automate the measuring procedure of a SEIKEN DTC-158 Resonant Column Apparatus and a SEIKEN DTC-199 Cyclic Triaxial Torcional Apparatus for cohesive and non-cohesive soils are described. One of the boards performs the measuring functions that include the measurement of voltages, frequencies and phase differen...

The permeation of microwave pulses ( / = 9 . 4 G H z . pulse duration: 0 .5-0 .7 ps) through a partially ionized hydrogen plasma is investigated. At supercritical electron densities (line-averaged density: n t = 1.2-1.8 x 10 m~) a resonant enhancement of the wave amplitude is observed between the plasma column and the metallic end reflector of the waveguide. Local measurements of the electric f...

The observation of internal solitary waves (ISWs) propagating upstream along a strongly stratified bottom layer on the California shelf is reported. An increased concentration of particulates in the water column accompanies the passage of these ISW packets. The estimated local Richardson number in the bottom vicinity is around 1/4, and a vertical coefficient of eddy diffusivity of order 1022 m2...

Based on the C-shaped microstrip slot antenna, a new photonic band gap substrate for multifrequency microstrip slot antenna is designed. The antenna has a groove been dug below the radiation plate, within which the radiation plate is placed, and air triangular prism column gaps with different height are placed in the substrate periodically. Numerical simulation is performed for the antenna with...

Cyclotron lines in accreting X-ray pulsar spectra result from the resonant scattering of X-rays by electrons in Landau orbits on the intense (∼10 G) magnetic fields near the neutron star poles. For this reason they are known as cyclotron resonance scattering features (CRSFs). Because Landau transition energies are proportional to field strength (Ecyc = 12 keV approximately corresponds to B = 10...

Electron energy-loss spectroscopy (EELS) is an efficient tool for investigating the local density of optical states in single and coupled nano-systems in a transmission electron microscope (TEM) [1]. In EELS, a relativistic electron inelastically interacts with a sample, and hence loses energy by pumping the sample to a higher photonic state. The amount of energy loss of the electron is detecte...

2.4: (a) Load Resonant Inverter Schematic, (b) Control Circuit. 24. Fig. Voltage and current source inverter was invented before resonant inverter, but resonant. 2.1 Resonant Switching theory and converter classification. 2.2.3 Series Parallel Resonant Converter (SPRC). A.1.10 Verify resonant-circuit converter. The resonant inverters used to supply the inductor-pot system can be classified Thus...

X-ray observations have revealed that many microquasars and low-mass X-ray binaries (LMXBs) exhibit narrow absorption features identified with resonant absorption from Fexxv and Fexxvi and other abundant ions. In many well studied systems there is evidence for blue-shifts, indicating outflowing plasmas. We succesfully model the changes in both the X-ray continuum and the Fe absorption features ...