Numerical simulation and deposition prediction for new developed deep waterway in silting shoals

There are many silting shoals distribution in China coast. And more and more harbours have been built in this areas, because of the demand of port for industry development. The deposition on waterway is essential factor for such ocean engineering. In this paper, a study will be taken as an example for the new developed channel using Lianyungagang deep channel. It takes investigation, data analysis, numerical simulation and model of sediment deposition measures in silting shoals or new developed waterway to study the construction of deep channel. Firstly, flow variations after harbour layout and deep channel are discussed. It shows that the suitable distribution of harbour is essential for regulation the crosscurrent to keep the safety of ship sailing in new developed channel. The depth of channel has also certain effect on current. On the basis of sediment study, the prediction model is built to study the deposition in new developed waterway. And silting distribution along the channel are given for different schemes. It suggest that, the gate of harbour should be positioned at the outside of wave broken zone to avoid the strong deposition at gated of channel under strong storm. The study case is useful for selection of channel position, the gate of harbour, and regulation of crosscurrent in new developed harbour zone and channel selection

Optimization of superstructured fiber bragg gratings for microwave photonic filters response

The microwave photonic responses of superstructured fiber Bragg gratings in combination with dispersive fiber are investigated theoretically and experimentally. The superstructured gratings are optimized, taking account of the spectral response of the broad-band source, Erbium-doped fiber amplifier, and optical tunable filter to achieve a filter response with sidelobe suppression of more than 60 dB. © 2004 IEEE

Contribution of pulsars to the gamma-ray background and their observation with the space telescopes GLAST and AGILE

Luminosities and uxes of the expected population of galactic gamma-ray pulsars become foreseeable if physical distributions at birth and evolutive history are assigned. In this work we estimate the contribution of pulsar uxes to the gamma-ray background, which has been measured by the EGRET experiment on board of the CGRO. For pulsar luminosities we select some of the most important gamma-ray emission models, taking into account both polar cap and outer gap scenarios. We nd that this contribution strongly depends upon controversial neutron star birth properties. A comparison between our simulation results and EGRET data is presented for each model, nding an average contribution of about 10%. In addition, we perform the calculation of the number of new gamma-ray pulsars detectable by GLAST and AGILE, showing a remarkable di erence between the two classes of models. Finally, we suggest some improvements in the numerical code, including more sophisticated galactic m odels and di erent populations of pulsars like binaries, milliseconds, anomalous pulsars and magnetars.Comment: 6 pages, 6 figures, to be published in the Proceedings of the 6th International Symposium ''Frontiers of Fundamental and Computational Physics'' (FFP6), Udine (Italy), Sep. 26-29, 200

A nondiagrammatic calculation of the Rho parameter from heavy fermions

A simple nondiagrammatic evaluation of the nondecoupling effect of heavy fermions on the Veltman's Rho parameter is presented in detail. This calculation is based on the path integral approach, the electroweak chiral Lagrangian formalism, and the Schwinger proper time method.Comment: 11 page

A new method for microwave generation and data transmission using DFB laser based on fiber bragg gratings

A novel architecture for microwave/millimeter-wave signal generation and data modulation using a fiber-grating-based distributed feedback laser has been proposed in this letter. For demonstration, a 155.52-Mb/s data stream on a 16.9-GHz subcarrier has been transmitted and recovered successfully. It has been proved that this technology would be of benefit to future microwave data transmission systems. © 2006 IEEE