This paper studies a delayed air-sea coupled oscillator describing the physical mechanism of El Nino Southern Oscillation. The approximate expansions of the delayed differential equation＇s solution are obtained succe...This paper studies a delayed air-sea coupled oscillator describing the physical mechanism of El Nino Southern Oscillation. The approximate expansions of the delayed differential equation＇s solution are obtained successfully by the modified variational iteration method. The numerical results illustrate the effectiveness and correctness of the method by comparing with the exact solution of the reduced model.展开更多
Erbium silicide nanoislands on Si(001)surface are fabricated by novel multiple depositions and annealing treatments method.The morphological investigations determine that the islands could grow with stable square shap...Erbium silicide nanoislands on Si(001)surface are fabricated by novel multiple depositions and annealing treatments method.The morphological investigations determine that the islands could grow with stable square shapes rather than the shape transformation exhibited in the traditional single time evaporation growth.Size distributions analyses further elucidate the effect of multiple depositions and annealing treatments on the nanoisland growth.It is suggested that strain relaxation and static coMescence play important roles in the cyclic growth.Specifically,after 15 times of the cycles,the larger islands are found to undergo the Ostwald ripening,which make the shape of nanoislands irregular.This gives us the direction to adjust the growth parameters to control the island morphology.Furthermore,the crystalline structure of the Er silicide nanoislands is efficiently characterized by grazing incidence synchrotron x-ray diffraction.展开更多
Erbium silicide nanowires are self-assembled on vicinal Si(001)substrates after electron beam evaporation and post annealing at 630°C In−situ scanning tunneling microscopy investigations manifest that the nanowir...Erbium silicide nanowires are self-assembled on vicinal Si(001)substrates after electron beam evaporation and post annealing at 630°C In−situ scanning tunneling microscopy investigations manifest that the nanowires will successively shrink and transform into a nanoisland with annealing prolonged.Meanwhile,a structural transition from hexagonal AlB2 phase to tetragonal ThSi2 phase is revealed with high-resolution transmission electron microscopy.It is also found that the nanowires gradually expand to embed into the substrates during the growth process,which has much influence on the shape instability of nanowires.Additionally,a multiple deposition-annealing treatment is given as a novel growth method to strengthen the controlled fabrication of nanowires.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.41105063 and 61070041)
文摘This paper studies a delayed air-sea coupled oscillator describing the physical mechanism of El Nino Southern Oscillation. The approximate expansions of the delayed differential equation＇s solution are obtained successfully by the modified variational iteration method. The numerical results illustrate the effectiveness and correctness of the method by comparing with the exact solution of the reduced model.
基金Supported by the National Basic Research Program of China under Grant No 2006CB921300the Natural Science Foundation of Shanghai Science and Technology Committee under Grant No 08ZR1401700Shanghai Postdoctoral Sustentation Fund under Grant No 10R21416600.
文摘Erbium silicide nanoislands on Si(001)surface are fabricated by novel multiple depositions and annealing treatments method.The morphological investigations determine that the islands could grow with stable square shapes rather than the shape transformation exhibited in the traditional single time evaporation growth.Size distributions analyses further elucidate the effect of multiple depositions and annealing treatments on the nanoisland growth.It is suggested that strain relaxation and static coMescence play important roles in the cyclic growth.Specifically,after 15 times of the cycles,the larger islands are found to undergo the Ostwald ripening,which make the shape of nanoislands irregular.This gives us the direction to adjust the growth parameters to control the island morphology.Furthermore,the crystalline structure of the Er silicide nanoislands is efficiently characterized by grazing incidence synchrotron x-ray diffraction.
基金by the National Basic Research Program of China under Grant No 2006CB921300the Natural Science Foun-dation of Shanghai Science and Technology Committee under Grant No 08ZR1401700.
文摘Erbium silicide nanowires are self-assembled on vicinal Si(001)substrates after electron beam evaporation and post annealing at 630°C In−situ scanning tunneling microscopy investigations manifest that the nanowires will successively shrink and transform into a nanoisland with annealing prolonged.Meanwhile,a structural transition from hexagonal AlB2 phase to tetragonal ThSi2 phase is revealed with high-resolution transmission electron microscopy.It is also found that the nanowires gradually expand to embed into the substrates during the growth process,which has much influence on the shape instability of nanowires.Additionally,a multiple deposition-annealing treatment is given as a novel growth method to strengthen the controlled fabrication of nanowires.
