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Numerical analysis of consolidation settlement and creep deformation of artificial island revetment structure in a large-scale marine reclamation land project

100%

Zhao J. , Zhou T. , Wang G.

tom S 1

35--42

In order to analyze the influential factors of soft foundation settlement in a marine reclamation land project, the consolidation settlement and pore pressure dissipation of the entire area are numerically simulated using Soft-SoilCreep Model, in which the PLAXIS finite element software for professional geotechnical engineering is applied and empirical data of Japanese Kansai’s airport project are used. Moreover, the figures of settlement and pore pressure results in the different basic period are drawn, and the corresponding analysis conclusions are obtained based on the comparison among the results from the computational parameters of depth. In addition,, the influence rules of various parameters on settlement results is concluded through running the parameter sensitivity analysis in Soft-Soil-Creep Model, and the experience and conclusions can be for reference in the design and con-struction of similar large-scale marine reclamation land project. Also the empirical value method of the creep index has not been applied widely. Further research needs to be done.

Research on the dot-by-dot imaging algorithm for multi-beam SAS with multi-frequency in azimuth

100%

Zhou T. , Li H. , Xu J. , Xu C.

2013

tom R. 89, nr 3b

188--192

In multi-beam synthetic aperture sonar (SAS), the smaller the transmit sensor array’s physics aperture is, the larger its synthetic aperture length is, and then the better its along-track resolution will be. But when the physics aperture is small, the mapping speed should be limited to avoid the azimuth ambiguity. In order to overcome this problem, a scheme of multi-beam SAS with multi-frequency in azimuth is proposed in this paper based on the sensor array configuration and basic principle of multi-beam SAS. A correlated math model is presented and the dot-by-dot imaging algorithm is simulated according to the new scheme. Compared with the primary multi-beam SAS scheme proposed before, the new scheme can improve the along-track resolution and increase the mapping speed. Computer simulation results are given to test the correctness and efficiency of the new scheme.

W artykule przedstawiono nową strukturę wielowiązkowego sensora SAS, pozwalającą na eliminację problemów związanych z dwuznacznością azymutu. Proponowane rozwiązanie bazuje na podstawowych zasadach działania SAS oraz odpowiedniej konfiguracji tablicy czujników. Zbudowano także model matematyczny oraz opracowano algorytm pozwalający na obrazowanie działania punkt po punkcie. Dokonano weryfikacji symulacyjnej proponowanej struktury.

Investigation on Chaotic Characteristic of PD Magnitude Series during Propagation of Electrical tree in XLPE Power Cables

88%

Liao R. , Wang K. , Liu L. , Zhou T. , Zhou Q.

Przegląd Elektrotechniczny

2012

tom R. 88, nr 5b

213-217

The electrical tree propagation experiments were performed under high voltages with a frequency of 50Hz and amplitudes ranging from 12kV to 21kV at room temperature by utilizing an actual XLPE cable as the test sample, where the concentration of electrical field was simulated by a metal needle tip. The chaotic theory was introduced to analyze the PD magnitude series during the propagation process of electrical tree. Experimental results show that deterministic chaos exists in the propagation of electrical tree in XLPE cables, and the largest Lyapunov exponent and correlation of the strange attractors increase with the decrease of electrical tree fractal dimension. The results may provide a new approach for online diagnosis of electrical tree morphology.

rzedstawiono wynika badania wyładowania w kablu XPLE przy częstotliwości 50 Hz i napięciu 12 – 21 kV. Stwierdzono chaotyczny charakter drzewienia elektrycznego. Zaproponowano opis teoretyczny umożliwiający łatwe rozpoznanie typu wyładowania.

Neurons derived from PC12 cells have the potential to develop synapses with primary neurons from rat cortex

75%

Zhou T. , Xu B. , Que H. , Lin Q. , Lv S. , Liu S.

nr 2