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格的模糊滤子与模糊素滤子的度量 被引量:3
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作者 黄飞 廖祖华 《计算机工程与应用》 CSCD 北大核心 2018年第24期26-33,共8页
主要研究了模糊代数中格的模糊(素)滤子的度量。首先给出了模糊(素)滤子度的新概念,并利用模糊(素)滤子度讨论了格的模糊子集是模糊(素)滤子的程度。其次,利用格的模糊集的(强)水平集得到了模糊(素)滤子的等价刻画。最后,讨论了任意多... 主要研究了模糊代数中格的模糊(素)滤子的度量。首先给出了模糊(素)滤子度的新概念,并利用模糊(素)滤子度讨论了格的模糊子集是模糊(素)滤子的程度。其次,利用格的模糊集的(强)水平集得到了模糊(素)滤子的等价刻画。最后,讨论了任意多个模糊子集的交、直积的模糊(素)滤子度以及格的模糊子集在同态映射下像与原像的模糊(素)滤子度的性质。 展开更多
关键词 () 模糊() R-蕴涵 度量
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Isolation and Purification of Gonyautoxins from Two Strain of Alexandrium minutum Halim 被引量:1
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作者 缪宇平 陈逸民 +1 位作者 周宏农 闻韧 《Journal of Chinese Pharmaceutical Sciences》 CAS 2004年第2期103-105,共3页
Aim To study isolation and purification of Gonyautoxins from two differentstrains of Alexandrium minutum Halim. Methods Ethanol extracts of the two culture strains ofAlexandrium minutum Halim were fractionated by gel ... Aim To study isolation and purification of Gonyautoxins from two differentstrains of Alexandrium minutum Halim. Methods Ethanol extracts of the two culture strains ofAlexandrium minutum Halim were fractionated by gel filtration and ion exchange chromatography toobtain gonyautoxins. The toxin profiles were tested by HPLC method. Results Both strains containgonyautoxin-1, gonyautoxin-2, gonyautoxin-3 and gonyautoxin-4. The total gonyautoxin content ofAmtk4 strain is almost 10 times higher than that of Amtk2 strain. Conclusion Alexandrium minutumHalim Amtk4 strain is suitable for the preparation of Gonyautoxins. 展开更多
关键词 alexandrium minutum halim gonyautoxins gel filtration chromatography ionexchange chromatography
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相对凸子格的一类相对理想与相对滤子
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作者 史佳鸿 吴妙玲 刘月明 《模糊系统与数学》 北大核心 2021年第4期23-29,共7页
文中给出了相对凸子格的一类相对理想、相对滤子以及相对最小理想的具体表达式,证明了相对凸子格可表示为相对理想与相对滤子的交,讨论了相对理想成为相对素理想的充要条件,阐述了格的素理想与相对凸子格的相对素理想的关系。
关键词 相对凸 ()理想 ()
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Prime Space of Lattice Implication Algebras
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作者 宋振明 郭天榜 《Chinese Quarterly Journal of Mathematics》 CSCD 1997年第4期46-50, ,共5页
In this paper,after discussing the prime implication filter of lattice implication algebra,we introduced the concept of prime space of lattice implication algebra,in which we analysised its topological property and di... In this paper,after discussing the prime implication filter of lattice implication algebra,we introduced the concept of prime space of lattice implication algebra,in which we analysised its topological property and discussed the relation between the category of topological space and the category of lattice implication algebras. 展开更多
关键词 lattice implication algebra prime implication filter topological space prime space CATEGORY
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Three-liquid-phase extraction and separation of V(V) and Cr(VI) from acidic leach solutions of high-chromium vanadium–titanium magnetite 被引量:5
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作者 Pan Sun Kun Huang +4 位作者 Xiaoqin Wang Na Sui Jieyuan Lin Wenjuan Cao Huizhou Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第7期1451-1457,共7页
A new method by liquid-liquid-liquid three phase system, consisting of acidified primary amine N1923 (abbreviated as A-N1923), poly(ethylene glycol) (PEG) and (NH4)2S04 aqueous solution, was suggested for the ... A new method by liquid-liquid-liquid three phase system, consisting of acidified primary amine N1923 (abbreviated as A-N1923), poly(ethylene glycol) (PEG) and (NH4)2S04 aqueous solution, was suggested for the separation and simultaneous extraction of Ⅴ(Ⅴ) and Cr(Ⅵ) from the acidic leach solutions of high- chromium vanadium-titanium magnetite. Experimental results indicated that Ⅴ(Ⅴ) and Cr(Ⅵ) could be selectively enriched into the A-N1923 organic top phase and PEG-rich middle phase, respectively, while AI(Ⅲ) and other co-existing impurity ions, such as Si(Ⅳ), Fe(Ⅲ), Ti(Ⅳ), Mg(Ⅱ) and Ca(Ⅱ) in acidic leach solutions, could be enriched in the (NH4)2SO4 bottom aqueous phase. During the process for extraction and separation of Ⅴ(Ⅴ) and Cr(Ⅵ), almost all of impurity ions could be removed. The separation factors between Ⅴ (Ⅴ) and Cr(Ⅵ) could reach 630 and 908, respectively in the organic top phase and PEG middle phase, and yields of recovered Ⅴ(Ⅴ) and Cr(Ⅵ) in the top phase and middle phase respectively were all above 90%. Various effects including aqueous pH, A-N1923 concentration, PEG added amount and (NH4)2SO4 concentration on three-phase partitioning of Ⅴ(Ⅴ) and Cr(Ⅵ) were discussed. It was found that the partition of Cr(Ⅵ) into the PEG-rich middle phase was driven by hydrophobic interaction, while extraction of Ⅴ(Ⅴ) by A-N1923 resulted of anion exchange between NO; and H2V10O4-28. Stripping of Ⅴ(Ⅴ) and Cr(Ⅵ) from the top organic phase and the middle PEG-rich phase were achieved by mixing respectively with NANO3 aqueous solutions and NaOH-(NH4)2SO4 solutions. The present work highlights a new approach for the extraction and purification of V and Cr from the complex multi-metal co-existing acidic leach solutions of high-chromium vanadium-titanium magnetite. 展开更多
关键词 Three-liquid-phase extraction VANADIUM CHROMIUM Separation High-chromium vanadium-titanium magnetite
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