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逆阻型大容量门极可关断晶闸管
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作者 吕征宇 陈友法 赵丽娟 《浙江大学学报(自然科学版)》 CSCD 1989年第2期244-251,共8页
研究了门极可关断晶闸管的关断原理,参数设计及制造工艺技术;提供了逆阻型大容量门极可关断晶闸管的设计参数、图形结构及制造工艺过程。并对门极可关断晶闸管的扩散杂质分布、各单元及多个单元并联的特性进行了测试。
关键词 晶闸管 逆阻型 大溶量 门极 可关断
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Protein and hordein fraction content in barley seeds as affected by sowing date and their relations to malting quality 被引量:4
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作者 齐军仓 陈锦新 +3 位作者 汪军妹 邬飞波 曹连莆 张国平 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE EI CAS CSCD 2005年第11期1069-1075,共7页
The effect of sowing date on grain protein, hordein fraction content and malting quality of two-rowed spring barley was investigated by using ten commercial cultivars with different grain protein content and the relat... The effect of sowing date on grain protein, hordein fraction content and malting quality of two-rowed spring barley was investigated by using ten commercial cultivars with different grain protein content and the relationships among these traits were examined. The results showed that grain protein content and B hordein content increased as the sowing date postponed and were significantly affected by sowing date, while C and D hordein contents were less influenced by sowing date. There were significant differences in grain protein and hordein fraction content among the ten cultivars. The coefficient of variation of D hordein content was much larger than that of B and C hordein contents, suggesting its greater variation caused by different sowing dates. Beta-amylase activity and diastatic power were also significantly affected by sowing date, with malt extract being less affected. Significant differences in measured malt quality were found among the ten cultivars. Grain protein was significantly correlated with B hordein and malt extract positively and negatively, respectively. There was no significant correlation between beta-amylase activity or diastatic power and grain protein content. B hordein was negatively and significantly correlated with malt extract, but no significant correlations between C hordein, D hordein and malting quality traits. 展开更多
关键词 Barley (Hordeum vulgare L.) Sowing date PROTEIN Hordein Malting quality
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Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent 被引量:7
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作者 WANG Jiahong JI Yan fen +2 位作者 DING Shaolan MA Hongrui HAN Xiaojing 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第6期594-599,共6页
Tannic acid is generally considered as one of polyphenolic pollutants, which may cause severe threats to the environment. In this study, polyaniline adsorbent was synthesized by chemical oxidation to remove tannic aci... Tannic acid is generally considered as one of polyphenolic pollutants, which may cause severe threats to the environment. In this study, polyaniline adsorbent was synthesized by chemical oxidation to remove tannic acid in aqueous solutions. The adsorption amount of tannic acid varied greatly with pH of solution and strong adsorption was at pH 5.8-6.7. Coexisting cations, such as Na+, K+, and Ca2+, can enhance the adsorption of tannic acid on poly- aniline, which may be contributed to the electrostatic interaction between tannic acid and polyaniline. The adsorp- tion process could be well described by Langmuir model and the maximum adsorption capacity was 117.65 rag.g〈 at 35℃and pH 6.0. The thermodynamic parameters calculated from the adsorption isotherms indicate that the ad- sorption of tannic acid is spontaneous and endothermic process. The polyaniline saturated with tannic acid can be desorbed in alkaline solution and regenerated adsorbent can be used repeatedly with high adsorption capacity, which implies that polyaniline adsorbents have a great potential in water purification for the removal of tannic acid. 展开更多
关键词 POLYANILINE ADSORPTION DESORPTION tannic acid
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Detecting Aerosols over Land from Satellites by Measuring Far IR Radiation from the Earth-Atmospheric System
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作者 SHI Guang-Yu SUN Yuan-Long 《Atmospheric and Oceanic Science Letters》 2010年第2期111-115,共5页
In this study, a special method is proposed for detecting aerosols over land by analyzing satellitemeasured far IR radiation at three channels, 8.7, 11.5, and 12.5 lain. Sensitivity tests revealed that the behavioral ... In this study, a special method is proposed for detecting aerosols over land by analyzing satellitemeasured far IR radiation at three channels, 8.7, 11.5, and 12.5 lain. Sensitivity tests revealed that the behavioral features of radiative brightness temperatures (BTs) at these three channels with increasing optical depth are different among different types of aerosols. Analyzing how BTs and their differences, xBT (BT11.5-BT12.5) and YBT (BT8.7-BT11.5), behave with varying optical depth can help to qualitatively distinguish among aerosols and semi-quantitatively estimate their optical thicknesses. In addition, the authors found that the vertical density profile of aerosols has little impact on this method. 展开更多
关键词 aerosol remote-sensing over-land IR radia- tion brightness temperature satellite
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Practical Paths towards Lowering Black Carbon Emissions
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作者 Guorui Zhi Xiaoye Zhang Hongbing Cheng Junli Jin Fang Zhang Tingting Wang Xiaochun Zhang 《Advances in Climate Change Research》 SCIE 2011年第1期12-22,共11页
Black carbon (BC) aerosol, accounting for a minor fraction of atmospheric aerosols, is attracting increased attentio1 due to its impact on air quality, human health, and climate change. Focusing on BC emission reduc... Black carbon (BC) aerosol, accounting for a minor fraction of atmospheric aerosols, is attracting increased attentio1 due to its impact on air quality, human health, and climate change. Focusing on BC emission reduction, this paper give1 a brief introduction to the sources and global distribution of BC. Along with the decrease of BC emissions from sue1 actions as the reduction of global greenhouse gases (GHGs) and regulating local air quality, it also highlights othet BC reduction approaches such as control and improvement of combustion conditions, the elimination of open biomas burning, and the sequestration of BC by biomass pyrolysis. Finally, it is stressed that at this moment there is no enougt reason to push BC reduction into any climate change related negotiations, although BC has been included in some o so-called win-win reduction targets for the quick response to both climate and non-climate appeals. 展开更多
关键词 black carbon REDUCTION policy consideration
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