Based on 150-year simulations of a regional climate model, RegCM3, under the Special Report on Emissions Scenarios (SRES) A1B scenario, the effective drought index (EDI) is used to project the future drought change in...Based on 150-year simulations of a regional climate model, RegCM3, under the Special Report on Emissions Scenarios (SRES) A1B scenario, the effective drought index (EDI) is used to project the future drought change in China. During the baseline period 1986-2005, RegCM3 was found to reliably simulate the spatial pattern of drought over the country. Over the 21st century, the regionally averaged EDI should increase, corresponding to a decrease of drought, while the probability of extreme drought events should increase. Geographically, drought should clearly increase in Northeast China, the middle and lower reaches of the Yangtze River valley, Southwest China, and southern Tibet but decrease in most parts of the rest of the country.展开更多
Based on the guided mode resonance effect,single-layer transmission filters are presented.It is found that there is an intersection region in which the strong modulation waveguide modes TE_(0) and TE_(2) can be simult...Based on the guided mode resonance effect,single-layer transmission filters are presented.It is found that there is an intersection region in which the strong modulation waveguide modes TE_(0) and TE_(2) can be simultaneously excited by the second and first diffraction orders,respectively.A very high transmission peak emerges when the leaky modes interact with each other.Based on the normalized eigen-function of a single-layer waveguide grating,the high resonance transmission filters can be designed at any central wavelength.In order to demonstrate this concept,we design narrow line-shaped band pass filters with a central wavelength at 0.8,1.06 and 10.6μm.展开更多
基金supported by the National Basic Research Program of China(Grant No.2009CB421407)the National Natural Science Foundation of China(Grant No.41130103)
文摘Based on 150-year simulations of a regional climate model, RegCM3, under the Special Report on Emissions Scenarios (SRES) A1B scenario, the effective drought index (EDI) is used to project the future drought change in China. During the baseline period 1986-2005, RegCM3 was found to reliably simulate the spatial pattern of drought over the country. Over the 21st century, the regionally averaged EDI should increase, corresponding to a decrease of drought, while the probability of extreme drought events should increase. Geographically, drought should clearly increase in Northeast China, the middle and lower reaches of the Yangtze River valley, Southwest China, and southern Tibet but decrease in most parts of the rest of the country.
基金Supported by the Natural Science Foundation of Shanghai Committee of Science and Technology under Grant No 10ZR1433500.
文摘Based on the guided mode resonance effect,single-layer transmission filters are presented.It is found that there is an intersection region in which the strong modulation waveguide modes TE_(0) and TE_(2) can be simultaneously excited by the second and first diffraction orders,respectively.A very high transmission peak emerges when the leaky modes interact with each other.Based on the normalized eigen-function of a single-layer waveguide grating,the high resonance transmission filters can be designed at any central wavelength.In order to demonstrate this concept,we design narrow line-shaped band pass filters with a central wavelength at 0.8,1.06 and 10.6μm.
