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Organic Solvents Enhanced Spectrofluorimetric Method for Determination of Laccase Activity 被引量:2
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作者 Huang Zuyun, Liu Zhihong, Cat Ruxiu, Zeng Yun’e(Department of Chemistry, Wuhan University,Wuhan 430072, China) 《Wuhan University Journal of Natural Sciences》 EI CAS 1998年第1期123-125,共3页
A novel fluorimetric method for determination of laccase activity in organic solvents is proposed, based on the oxidation ofo-phenylenediamine (1,2-diaminobenzene, OPDA) catalyzed by laccase yielding 2,3-diaminophenaz... A novel fluorimetric method for determination of laccase activity in organic solvents is proposed, based on the oxidation ofo-phenylenediamine (1,2-diaminobenzene, OPDA) catalyzed by laccase yielding 2,3-diaminophenazine. The optimal conditions for laccase in organic media areT=55°C, pH=6.5, 1.0×10?2mol/L OPDA, 1.25 mL ethanol, 1.25 mL 1,4-dioxane and 1.25 mL acetone. The linear range of the method proposed in ethanol, 1,4-dioxane and acetone media were 0.44–19.33, 0.11–20.85, 0.38–21.05 U with the detection limit of 0.088, 0.022, 0.076 U, respectively. The proposed method has been applied to the analysis of laccase activity of real samples with more accurate and sensitive than that of the previous method reported. 展开更多
关键词 key words Organic solvent laccase activity FLUORIMETRY o phenylenediamine (OPDA)
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Synthesis of Glucoside Compounds of Ferrocenyl Phenols and Their Antianemic Activity
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作者 Liu Huiying, Chen Yong, Zhao Hongxing, Li Xinhong,Li Baorui (Department of Chemistry, Wuhan University, Wuhan 430072, China)Zeng Fanbo, Cui Xiaorui(Department of Pharmacy, Tongji Medical University, Wuhan 430030, China) 《Wuhan University Journal of Natural Sciences》 EI CAS 1998年第1期81-85,共5页
Six glucoside compounds have been synthesized by means of phase-transfer catalytic method and deacetylation from the starting material ferrocene. Their structures have been confirmed by elementary analysis, IR,1HNMR a... Six glucoside compounds have been synthesized by means of phase-transfer catalytic method and deacetylation from the starting material ferrocene. Their structures have been confirmed by elementary analysis, IR,1HNMR and MS. The antianemic activities of some compounds have also been tested. Results indicate that these glucoside compounds possess the antianemic activities and therefore, the further study is well worth making. 展开更多
关键词 key words ferrocenyl phenol glucosidic bond antianemic activity ferrocenyl derivatives organometal glucoside compound
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舱外航天服热试验数值仿真方法研究
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作者 王刘杰 黄伟芬 +1 位作者 徐水红 周永康 《计算机工程与设计》 CSCD 北大核心 2012年第10期3931-3934,3974,共5页
研究舱外航天服热试验数值仿真方法,以达到简化仿真工作,同时保证仿真结果准确的目的。从分析试验组件物性着手,建立一对一理想加热模型分析影响被加热表面热流的因素,再用NX软件建立试验仿真模型和试验数据对比,讨论仿真关键参数。研... 研究舱外航天服热试验数值仿真方法,以达到简化仿真工作,同时保证仿真结果准确的目的。从分析试验组件物性着手,建立一对一理想加热模型分析影响被加热表面热流的因素,再用NX软件建立试验仿真模型和试验数据对比,讨论仿真关键参数。研究结果表明,只有舱外航天服外形和实际接近、添加遮挡热流的试验支架等物体、适当调整红外加热笼发射率,仿真模型才能准确模拟试验热流情况,航天服上半身受遮挡较少,试验测量较准确,仿真结果和试验数据的偏差小于10%。 展开更多
关键词 舱外航天服 真空热试验 热辐射 外热流 仿真方法
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RED-DTB: A Dual Token Bucket Based Queue Management Algorithm
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作者 YinJian-hua CaoYang +1 位作者 LingJun HuangTian-xi 《Wuhan University Journal of Natural Sciences》 EI CAS 2003年第02A期388-392,共5页
Improving the Quality of Service (QoS) of Internet traffic is widely recognized as a critical issue for the next-generation networks. In this paper, we present a new algorithm for the active queue management, namely R... Improving the Quality of Service (QoS) of Internet traffic is widely recognized as a critical issue for the next-generation networks. In this paper, we present a new algorithm for the active queue management, namely RED-DTB. This buffer control technique is used to enforce approximate fairness among a large number of concurrent Internet flows. Like RED (Random Early Detection) algorithm, the RED-DTB mechanism can be deployed to actively respond to the gateway congestion, keep the gateway in a healthy state, and protect the fragile flows from being stolen bandwidth by greedy ones. The algorithm is based on the so-called Dual Token Bucket (DTB) pattern. That is, on the one hand, every flow is rate-limited by its own token bucket, to ensure that it can not consume more than its fair share of bandwidth; On the other hand, to make some compensations to less aggressive flows, such as connections with larger round trip time or smaller sending window, and to gain a relatively higher system utilization coefficient, all flows, depending on their individual behavior, may have a chance to fetch tokens from the public token bucket when they run out of their own share of tokens. The algorithm is analyzed and evaluated by simulations, and is proved to be effective in protecting the gateway buffer and controlling the fair allocation of bandwidth among flows. 展开更多
关键词 key words congestion control active queue management Dual Token Bucket fair bandwidth allocation network simulation
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