本文以Web of Science、Scopus和中国知网1980—2018年核心期刊上发表的认知词典学相关论文为研究对象,借助AntConc软件统计、分析、比较国内外相关研究主题词在研究议题、研究视角和研究方法上的阶段分布特征,尝试厘清认知词典学研究...本文以Web of Science、Scopus和中国知网1980—2018年核心期刊上发表的认知词典学相关论文为研究对象,借助AntConc软件统计、分析、比较国内外相关研究主题词在研究议题、研究视角和研究方法上的阶段分布特征,尝试厘清认知词典学研究的动态发展并研判其前沿特征。研究发现,认知词典学研究在词典类别和词典要素上呈多元聚焦发展趋势,在研究视角和研究方法上以用户研究和实证研究为主导。基于认知词典学研究前沿特征,本文分析了国内研究之不足以探寻其未来发展路向。展开更多
Affinity membranes are fabricated for boric acid removal by the surface functionalization of microporous polypropylene membrane(MPPM)with lactose-based polyols.The affinity is based on specific complexation between bo...Affinity membranes are fabricated for boric acid removal by the surface functionalization of microporous polypropylene membrane(MPPM)with lactose-based polyols.The affinity is based on specific complexation between boric acid and saccharide polyols.A photoinduced grafting-chemical reaction sequence was used to prepare these affinity membranes.Poly(2-aminoethyl methacrylate hydrochloride)[poly(AEMA)]was grafted on the surfaces of MPPM by UV-induced graft polymerization.Grafting in the membrane pores was visualized by dying the cross-section of poly(AEMA)-grafted MPPM with fluorescein disodium and imaging with confocal laser scanning microscopy.It is concluded that lactose ligands can be covalently immobilized on the external surface and in the pores by the subsequent coupling of poly(AEMA)with lactobionic acid(LA).Physical and chemical properties of the affinity membranes were characterized by field emission scanning electron microscopy and Fourier Transform Infrared/Attenuated Total Refraction spectroscopy(FT-IR/ATR).3-Aminophenyl boric acid(3-APBA)was removed from aqueous solution by a single piece of lactose-functionalized MPPM in a dynamic filtration system.The results show that the 3-APBA removal reaches an optimal efficiency(39.5%)under the alkaline condition(pH9.1),which can be improved by increasing the immobilization density of LA.Regeneration of these affinity membranes can be easily realized through acid-base washing because the complexation of boric acid and saccharide polyol is reversible.展开更多
文摘本文以Web of Science、Scopus和中国知网1980—2018年核心期刊上发表的认知词典学相关论文为研究对象,借助AntConc软件统计、分析、比较国内外相关研究主题词在研究议题、研究视角和研究方法上的阶段分布特征,尝试厘清认知词典学研究的动态发展并研判其前沿特征。研究发现,认知词典学研究在词典类别和词典要素上呈多元聚焦发展趋势,在研究视角和研究方法上以用户研究和实证研究为主导。基于认知词典学研究前沿特征,本文分析了国内研究之不足以探寻其未来发展路向。
基金Supported by the National Natural Science Foundation of China(50933006)the National Basic Research Program of China(2009CB623401)
文摘Affinity membranes are fabricated for boric acid removal by the surface functionalization of microporous polypropylene membrane(MPPM)with lactose-based polyols.The affinity is based on specific complexation between boric acid and saccharide polyols.A photoinduced grafting-chemical reaction sequence was used to prepare these affinity membranes.Poly(2-aminoethyl methacrylate hydrochloride)[poly(AEMA)]was grafted on the surfaces of MPPM by UV-induced graft polymerization.Grafting in the membrane pores was visualized by dying the cross-section of poly(AEMA)-grafted MPPM with fluorescein disodium and imaging with confocal laser scanning microscopy.It is concluded that lactose ligands can be covalently immobilized on the external surface and in the pores by the subsequent coupling of poly(AEMA)with lactobionic acid(LA).Physical and chemical properties of the affinity membranes were characterized by field emission scanning electron microscopy and Fourier Transform Infrared/Attenuated Total Refraction spectroscopy(FT-IR/ATR).3-Aminophenyl boric acid(3-APBA)was removed from aqueous solution by a single piece of lactose-functionalized MPPM in a dynamic filtration system.The results show that the 3-APBA removal reaches an optimal efficiency(39.5%)under the alkaline condition(pH9.1),which can be improved by increasing the immobilization density of LA.Regeneration of these affinity membranes can be easily realized through acid-base washing because the complexation of boric acid and saccharide polyol is reversible.
