Blue and green organic fight-emitting devices with a structure of indium tin oxide （ITO）/N,N＇-bis-（1-naphthyl）-N,N＇- diphenyl- 1, l＇-biphenyl-4,4＇-diamine （NPB）/aluminum（HI） bis（2-methyl-8-quinolinato）4 ...Blue and green organic fight-emitting devices with a structure of indium tin oxide （ITO）/N,N＇-bis-（1-naphthyl）-N,N＇- diphenyl- 1, l＇-biphenyl-4,4＇-diamine （NPB）/aluminum（HI） bis（2-methyl-8-quinolinato）4 -phenylphenolato （BAlq）/tris（8- hydroxyquinolate）-aluminum （Alq3）/Mg：Ag have been fabricated. Blue to green light emission has been achieved with the change of organic film thickness. Based on energy band diagram and charge carrier tunneling theory, it is concluded that the films of different thicknesses play a role as a color-tuning layer and the color-variable electroluminescence （EL） is ascribed to the modulation function within the charge carrier recombination zone. In the case of heterostructure devices with high performance, the observed EL spectra varies significantly with the thickness of organic films, which is resulted from the shift of recombination region site. It has not been hitherto indicated that the devices compose of identical components could be implemented to realize different color emission by changing the film thickness of functional layers.展开更多
[Objective] The aim was to explore effects of silicon at different concentrations on morphology and photosynthetic physiological mechanism of japonica rice. [Method] Seedlings of japonica rice were treated with silico...[Objective] The aim was to explore effects of silicon at different concentrations on morphology and photosynthetic physiological mechanism of japonica rice. [Method] Seedlings of japonica rice were treated with silicon at different concentrations （0, 30, 80, 130 and 180 mg/L of sodium silicate）; silicon contents were measured with Molybdenum blue spectrophotometric method in root, stem and leaf; plant height, root length and number in different treatment groups were measured with tools; chlorophyll a and b, and a/b in leaf and stem of rice in different groups were measured. [Result] Silicon contents in vegetative organs were as follows： stem〉leaf〉 root; when silicon was 80 mg/L, japonica ecotype was shortest; when silicon was 30 mg/L, root length of the rice was shortest and root number was least; when silicon was 30 mg/L, contents of chlorophyll a and b were highest and chlorophyll a/b achieved the peak when silicon was 80 mg/L. [Conclusion] Silicon at proper concen- tration would improve lodging-resistance and efficiency of photosynthesis, further enhancing yield of japonica rice.展开更多
Heavy metals currently pose one of the most serious problems in terms of environmental protection. We analysed the effect of cadmium and mercury salts upon chlorophyll fluorescence emision of Microcystis aeruginosa, C...Heavy metals currently pose one of the most serious problems in terms of environmental protection. We analysed the effect of cadmium and mercury salts upon chlorophyll fluorescence emision of Microcystis aeruginosa, Cylindrospermopsis raciborskii and Aphanizomenon gracile. Time of incubation （3, 12 and 24 h） and salts concentration（1 μM, 10 μM, 100μM） influenced the emision. The higher the salt concentration and the longer the time of incubation, the greater the influence on inhibition of chlorophyll fluorescence was observed. Our results might indicate that nontoxic strains of M. aeruginosa MAKR0205 can have a high tolerance to heavy metal ions and ability of their detoxication. Further studies are necessary to confirm their potential ability in the water purification.展开更多
基金supported by National Science Foundation ofChina (Grant No. 60425101)Program for New Century Excel-lent Talents in University (Grant No. NCET-06-0812)the Young Excellent Project of UESTC( Grant No.060206)
文摘Blue and green organic fight-emitting devices with a structure of indium tin oxide （ITO）/N,N＇-bis-（1-naphthyl）-N,N＇- diphenyl- 1, l＇-biphenyl-4,4＇-diamine （NPB）/aluminum（HI） bis（2-methyl-8-quinolinato）4 -phenylphenolato （BAlq）/tris（8- hydroxyquinolate）-aluminum （Alq3）/Mg：Ag have been fabricated. Blue to green light emission has been achieved with the change of organic film thickness. Based on energy band diagram and charge carrier tunneling theory, it is concluded that the films of different thicknesses play a role as a color-tuning layer and the color-variable electroluminescence （EL） is ascribed to the modulation function within the charge carrier recombination zone. In the case of heterostructure devices with high performance, the observed EL spectra varies significantly with the thickness of organic films, which is resulted from the shift of recombination region site. It has not been hitherto indicated that the devices compose of identical components could be implemented to realize different color emission by changing the film thickness of functional layers.
基金Supported by Outstanding Young and Middle-aged Talent Program of Hubei Provincal Department of Education(Q20102501)~~
文摘[Objective] The aim was to explore effects of silicon at different concentrations on morphology and photosynthetic physiological mechanism of japonica rice. [Method] Seedlings of japonica rice were treated with silicon at different concentrations （0, 30, 80, 130 and 180 mg/L of sodium silicate）; silicon contents were measured with Molybdenum blue spectrophotometric method in root, stem and leaf; plant height, root length and number in different treatment groups were measured with tools; chlorophyll a and b, and a/b in leaf and stem of rice in different groups were measured. [Result] Silicon contents in vegetative organs were as follows： stem〉leaf〉 root; when silicon was 80 mg/L, japonica ecotype was shortest; when silicon was 30 mg/L, root length of the rice was shortest and root number was least; when silicon was 30 mg/L, contents of chlorophyll a and b were highest and chlorophyll a/b achieved the peak when silicon was 80 mg/L. [Conclusion] Silicon at proper concen- tration would improve lodging-resistance and efficiency of photosynthesis, further enhancing yield of japonica rice.
文摘Heavy metals currently pose one of the most serious problems in terms of environmental protection. We analysed the effect of cadmium and mercury salts upon chlorophyll fluorescence emision of Microcystis aeruginosa, Cylindrospermopsis raciborskii and Aphanizomenon gracile. Time of incubation （3, 12 and 24 h） and salts concentration（1 μM, 10 μM, 100μM） influenced the emision. The higher the salt concentration and the longer the time of incubation, the greater the influence on inhibition of chlorophyll fluorescence was observed. Our results might indicate that nontoxic strains of M. aeruginosa MAKR0205 can have a high tolerance to heavy metal ions and ability of their detoxication. Further studies are necessary to confirm their potential ability in the water purification.
