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用对分法计算二聚体系平衡常数 被引量:2
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作者 程国忠 叶芝祥 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2002年第3期515-517,共3页
本文根据组合原理组成任意的三元代数方程组 ,经过一系列代数变换 ,获得关于二聚体系平衡常数k的一元代数方程 ,用单调函数的性质判定该方程是否有解 ;对有解一元代数方程 ,用对分法等数值计算方法求得二聚体系平衡常数 ,并以拟合误差... 本文根据组合原理组成任意的三元代数方程组 ,经过一系列代数变换 ,获得关于二聚体系平衡常数k的一元代数方程 ,用单调函数的性质判定该方程是否有解 ;对有解一元代数方程 ,用对分法等数值计算方法求得二聚体系平衡常数 ,并以拟合误差为判据确定最终二聚体系平衡常数。用本方法计算出的二磺化酞菁和三磺化酞菁的平衡常数分别为 4 7973 4和 30 2 71 8,所得结果优于文献。 展开更多
关键词 二聚体系 平衡常数 函数单调性 对分法 拟合误差 磺化金属酞菁
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二聚体系中配合物生成反应动力学的研究方法 被引量:1
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作者 吴星 吕琳 +2 位作者 姚荣 刘天晴 陈忠 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 1997年第6期93-97,共5页
本文首次给出配体,配合物均可生成二聚体的配合物生成反应动力学研究方法。采用改进的二聚常数计算方法给出了多组分的精确解。用本方法研究了三磺化酞菁(Ⅰ)与Cu(Ⅱ)的反应动力学,结果表明,该反应速率方程为ν=K[L]2[... 本文首次给出配体,配合物均可生成二聚体的配合物生成反应动力学研究方法。采用改进的二聚常数计算方法给出了多组分的精确解。用本方法研究了三磺化酞菁(Ⅰ)与Cu(Ⅱ)的反应动力学,结果表明,该反应速率方程为ν=K[L]2[Cu] 展开更多
关键词 二聚体系 酞菁铜 三磺化酞菁铜 生成动力学
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二聚体系平衡常数的计算方法
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作者 吴星 吕琳 +2 位作者 刘天晴 吴锦华 陈忠 《扬州师院学报(自然科学版)》 CSCD 1995年第2期43-46,共4页
根据二聚体系表观浓度与吸光度的相关规律,对二聚常数的方程组求解法进行了改进,并应用改进后的方法计算了三磺化酞菁、四磺化酞菁钴的二聚常数,计算结果与实验值吻合.
关键词 二聚体系 平衡常数 三磺化酞菁 四磺化酞菁钴
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Preparation and Characterization of Solid Dispersions of Silymarin with Polyethylene Glycol 6000 被引量:6
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作者 李凤前 胡晋红 姜远英 《Journal of Chinese Pharmaceutical Sciences》 CAS 2003年第2期76-81,共6页
Aim To prepare and characterize solid dispersions of silymarin with the intention of improving their dissolution properties. Methods The solid dispersions were prepared by the fusion method with polyethylene glycol ... Aim To prepare and characterize solid dispersions of silymarin with the intention of improving their dissolution properties. Methods The solid dispersions were prepared by the fusion method with polyethylene glycol 6000(PEG 6000) as the carrier. Evaluation of the properties of the dispersions was performed using dissolution studies, X ray powder diffraction and Fourier transform infrared (FT IR) spectroscopy. Results The rate of dissolution of silymarin was considerably improved as compared with pure silymarin when formulated in solid dispersions with PEG 6000. The data of the X ray diffraction showed some changes in the parameters of lattice spacing [ d ], peak position and relative intensities. FT IR together with those from X ray diffraction showed the absence of well defined drug polymer interactions. Conclusion The dissolution improvement of poorly soluble silymarin could be illuminated by the changes of the lattice parameters of PEG 6000 and the drug. 展开更多
关键词 SILYMARIN solid dispersions X ray powder diffraction FT IR spectroscopy DISSOLUTION PEG 6000
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Preparation of Iminodiacetic Acid-Polyethylene Glycol for Immobilized Metal Ion Affinity Partitioning 被引量:3
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作者 林东强 姚善泾 +1 位作者 梅乐和 朱自强 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2000年第4期310-314,共5页
The synthesis route was investigated and optimized for the preparation of iminodiacetic acid-polyethylene glycol (IDA-PEG) for immobilized metal ion affinity partitioning in aqueous two-phase systems. IDA-PEG was synt... The synthesis route was investigated and optimized for the preparation of iminodiacetic acid-polyethylene glycol (IDA-PEG) for immobilized metal ion affinity partitioning in aqueous two-phase systems. IDA-PEG was synthesized from PEG in two steps by the reaction of iminodiacetic acid with a monosubstituted derivative of epichlorohydrin-activated PEG. The Cu2+ content combined with IDA-PEG was determined by atomic absorption spectrometry as 0.5 mol·mol^-1 (PEG). Furthermore, the affinity partitioning behavior of lactate dehydrogenase in polyethylene glycol/hydroxypropyl starch aqueous two-phase systems was studied to clarify the affinity effect of the Cu(Ⅱ)-IDA-PEG. 展开更多
关键词 immobilized metal ion affinity partitioning iminodiacetic acid-polyethylene glycol aqueous two-phase system
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An agent-based service-oriented integration architecture for chemical process automation
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作者 罗娜 钟伟民 +2 位作者 万锋 叶贞成 钱锋 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第1期173-180,共8页
In reality, traditional process control system built upon centralized and hierarchical structures presents a weak response to change and is easy to shut down by single failure. Aiming at these problems, a new agent-ba... In reality, traditional process control system built upon centralized and hierarchical structures presents a weak response to change and is easy to shut down by single failure. Aiming at these problems, a new agent-based service-oriented integration architecture was proposed for chemical process automation system. Web services were dynamically orchestrated on the internet and agent behaviors were built in them. Data analysis, model, optimization, control, fault diagnosis and so on were capsuled into different web services. Agents were used for service compositions by negotiation. A prototype system of poly(ethylene terephthalate) process automation was used as the case study to demonstrate the validation of the integration. 展开更多
关键词 Automation system Integration Web services Service-oriented architecture AGENT
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