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Effect of Elevated Air Temperature and Carbon Dioxide Levels on Dry Season Irrigated Rice Productivity in Bangladesh 预览
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作者 M. Maniruzzaman J. C. Biswas +9 位作者 M. B. Hossain M. M. Haque U. A. Naher A. K. Choudhury S. Akhter F. Ahmed R. Sen S. Ishtiaque M. M. Rahman N. Kalra 《美国植物学期刊(英文)》 2018年第7期1557-1576,共20页
Agricultural productivity is affected by air temperature and CO2 concentration. The relationships among grain yields of dry season irrigated rice (Boro) varieties (BRRI dhan28, BRRI dhan29 and BRRI dhan58) with increa... Agricultural productivity is affected by air temperature and CO2 concentration. The relationships among grain yields of dry season irrigated rice (Boro) varieties (BRRI dhan28, BRRI dhan29 and BRRI dhan58) with increased temperatures and CO2 concentrations were investigated for futuristic crop management in six regions of Bangladesh using CERES-Rice model (DSSATv4.6). Maximum and minimum temperature increase rates considered were 0&deg;C, +1&deg;C, +2&deg;C, +3&deg;C and +4&deg;C and CO2 concentrations were ambient (380), 421, 538, 670 and 936 ppm. At ambient temperature and CO2 concentration, attainable grain yields varied from 6506 to 8076 kg&middot;ha-1 depending on rice varieties. In general, grain yield reduction would be the highest (13% - 23%) if temperature rises by 4&deg;C and growth duration reduction would be 23 - 33 days. Grain yield reductions with 1&deg;C, 2&deg;C and 3&deg;C rise in temperature are likely to be compensated by increased CO2 levels of 421, 538 and 670 ppm, respectively. In future, the highest reduction in grain yield and growth duration would be in cooler region and the least in warmer saline region of the country. Appropriate adaptive techniques like shifting in planting dates, water and nitrogen fertilizer management would be needed to overcome climate change impacts on rice production. 展开更多
关键词 Maximum TEMPERATURE Minimum TEMPERATURE CO2 LEVELS Regional Variability Yield Compensation
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Er-doped concentric-cores optical fiber forsimultaneous amplification and compensation of positive dispersion
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作者 P.ramodR.Watekar M.L.N.Goswami +2 位作者 H.N.Acharya J.C.Biswas B.P.Pal 《中国光学快报:英文版》 SCIE EI CAS CSCD 2004年第1期12-14,共3页
The Er-doped concentric-cores dispersion compensating fiber (EDDCF) has been demonstrated. The rareearth has been doped as a ring around the inner core. We have obtained 14-dB gain at 1550 nm (using100-roW pump power ... The Er-doped concentric-cores dispersion compensating fiber (EDDCF) has been demonstrated. The rareearth has been doped as a ring around the inner core. We have obtained 14-dB gain at 1550 nm (using100-roW pump power and 980-nm wavelength) with dispersion of about -165 ps/(km-nm). It is useful forthe optical fiber network where amplification as well as negative dispersion are necessary. 展开更多
关键词 铒掺杂 同心光学光纤 同时放大 同时补偿 正极散射 负极散射
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