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Effect of Coke Reaction Index on Reduction and Permeability of Ore Layer in Blast Furnace Lumpy Zone Under Non-Isothermal Condition

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Journal of Iron and Steel Research International 2013年第4期20卷 6-10页

作者： zhao Hong-bo BAI yong-qiang CHENG Shu-sen State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing China Metallurgical Industry Planning and Research Institute

Reasonable control on CRI（coke reaction index）is one of the key factors for BF（blast furnace）low-carbon ***,there are contrary *** is increasing CRI to improve reaction efficiency in BF and the other is decreasing CRI to suppress coke degradation in *** methods are adopted to realize effective catalysis（increasing CRI）and passivation（decreasing CRI）of *** tests of coke in BF lumpy zone under gradual temperature rising have been *** of CRI on gas composition,ore reduction,burden column permeability and heat reserve zone′s temperature under non-isothermal condition are *** combined with iron making calculations,a novel BF operation suggestion is proposed as coke nut with small size be catalyzed and mixed with ore while skeletal coke with large size be passivated and separately charged into BF.

关键词： blast furnace low carbon smelting resistance loss coke reaction index

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加工条件对辣木籽肽抗氧化活性的影响

食品与机械 2016年第10期32卷 35-39页

作者：刘华勇赵强忠马彩霞林恋竹廖超林陈国慧古坚银华南理工大学食品科学与工程学院广东广州510640 浙江大学生物系统工程与食品学院浙江杭州310058 广东华谷辣木生物科技有限公司广东广州510760

在水酶法制取辣木籽抗氧化肽的基础上,研究温度、pH、金属离子、糖类对辣木籽肽抗氧化活性的影响。结果表明:115℃加热20min可显著提高辣木籽肽的抗氧化活性;辣木籽肽在酸性环境下抗氧化活性较高;酸性条件下,辣木籽肽加热后,其抗氧化活... 详细信息

在水酶法制取辣木籽抗氧化肽的基础上,研究温度、pH、金属离子、糖类对辣木籽肽抗氧化活性的影响。结果表明:115℃加热20min可显著提高辣木籽肽的抗氧化活性;辣木籽肽在酸性环境下抗氧化活性较高;酸性条件下,辣木籽肽加热后,其抗氧化活性提升较大;非热处理条件下,随着金属离子浓度的升高,辣木籽肽的抗氧化活性均有不同程度的提高;热处理条件下,随着Ca^(2+)、Mg^(2+)、Zn^(2+)、K^+浓度的升高,辣木籽肽的抗氧化活性变化不大,但略有降低,然而,随着Cu^(2+)浓度的增加,辣木籽肽抗氧化活性显著提高;热处理条件下,加入糖类物质包括:果糖、半乳糖、葡萄糖、乳糖、蔗糖、甘露糖、麦芽糖、低聚半乳糖会大大提高辣木籽糖的抗氧化活性,各种糖对辣木籽肽抗氧化活性提升的高低顺序为:果糖>半乳糖>低聚半乳糖>葡萄糖>乳糖=蔗糖=甘露糖=麦芽糖。该研究对辣木籽肽作为功能性配料用于食品开发具有指导意义。

关键词：辣木籽肽抗氧化稳定性

Carbon isotopic fractionation during vaporization of low molecular weight hydrocarbons(C6–C12)

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Petroleum Science 2017年第2期14卷 302-314页

作者： Qian-yong Liang yong-qiang Xiong Jing zhao Chen-Chen Fang Yun Li Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological Survey Ministry of Land and Resources Guangzhou 510760 Guangdong China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 Guangdong China PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083 China

Three series of laboratory vaporization experiments were conducted to investigate the carbon isotope fractionation of low molecular weight hydrocarbons（LMWHs）during their progressive *** addition to the analysis of a synthetic oil mixture,individual compounds were also studied either as pure single phases or mixed with *** allowed influences of mixing effects and diffusion though soil on the fractionation to be *** LMWHs volatilized in two broad behavior patterns that depended on their molecular weight and boiling *** significantly enriched the ^13C present in the remaining components of the C6–C9 fraction,indicating that the vaporization is mainly kinetically controlled;the observed variations could be described with a Rayleigh fractionation *** contrast,the heavier compounds（n-C10–n-C12）showed less mass loss and almost no significant isotopic fractionation during vaporization,indicating that the isotope characteristics remained sufficiently constant for these hydrocarbons to be used to identify the source of an oil sample,e.g.,the specific oil field or the origin of a ***,comparative studies suggested that matrix effects should be considered when the carbon isotope ratios of hydrocarbons are applied in the field.

关键词： Low molecular weight hydrocarbons Gas chromatography-isotope ratio mass spectrometry Isotope fractionation Vaporization

Recent research and development on forming for large magnesium alloy components with high mechanical properties

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Journal of Magnesium and Alloys 2023年第11期11卷 4054-4081页

作者： Zhimin Zhang Jianmin Yu yong Xue Beibei Dong Xi zhao qiang Wang College of Materials Science and Engineering North University of China3 Xueyuan RoadTaiyuan 030051China

The lightweight of high-end equipment relies on high mechanical properties magnesium(Mg) alloy structural components, because it is the best way to improve equipment service performance and reduce energy consumption. This article summarizes the current progress and characteristics of large-scale high-performance Mg alloy components by analyzing the strengthening-toughening mechanisms, characteristics of plastic forming, and the preparation of large high mechanical properties forging blanks. Due to the lack of breakthroughs in the key technologies for forming large-scale Mg alloy components, their uniformity of mechanical properties and consistency are poor, the forming accuracy of components is low, and the production cost is high, which limit their engineering application and restrict the lightweight level of high-end equipment. In view of the above problems, the forming trends and research directions of large-scale and high mechanical properties Mg alloy components are proposed in this paper. It can provide help for the breakthrough of the key technology of large-scale Mg alloy components with high mechanical properties and expand the application of Mg alloy in high-end products.

关键词： Mg alloys Wrought Mg alloys components Plastic forming Large-scale Mg alloys components High mechanical properties

A new simpler rotation/curvature correction method for Spalart-Allmaras turbulence model

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Chinese Journal of Aeronautics 2013年第2期26卷 326-333页

作者： Zhang qiang Yang yong National Key Laboratory of Science and Techniques on Aerodynamic Design and Research Northwestern Polytechnical University

A new and much simpler rotation and curvature effects factor, which takes the form of Richardson number suggested by Hellsten originally for SST k-ω model, is presented for Spalart and Shur＇s rotation and curvature correction in the context of Spalart-Allmaras （SA） turbulence model. The new factor excludes the Lagrangian derivative of the strain rate tensor that exists in the SARC model, resulting in a simple, efficient and easy-to-implement approach for SA turbulence model （denoted as SARCM） to account for the effects of system rotation and curvature, techniquely. And then the SARCM is tested through turbulent curved wall flows： one is the flow over a zeropressure-gradient curved wall and the other is the channel flow in a duct with a U-turn. Predictions of the SARCM model are compared with experimental data and with the results obtained using original SA and SARC models. The numerical results show that SARCM can predict the rotation-curvature effects as accurately as SARC, but considerably more efficiently. Additionally, the accuracy of SARCM might strongly depend on the rotation-curvature model constants. Suggesting values for those constants are given, after some trials and errors.

关键词： Accuracy Computation Curvature Improvement Robust Rotation Strain rate tensor Turbulence model

A simple fluorescence anisotropy assay for detection of bisphenol A using fluorescently labeled aptamer

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Journal of Environmental Sciences 2020年第11期32卷 19-24页

作者： Liying Liu qiang zhao State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Bisphenol A(BPA)is one of the environmental endocrine disruptors(EDCs),and BPA contamination in environment can cause high risks to human *** determination of BPA on sites is in high demand in environmental *** advantage of aptamers as affinity ligands and fluorescence anisotropy(FA)analysis,we developed a simple and rapid FA assay for BPA by employing a single tetramethylrhodamine(TMR)labeled short 35-mer DNA aptamer against *** assay is based on the BPA-binding induced conformation change of TMR-labeled aptamer and alteration of interaction between TMR and guanine bases,resulting in change of FA *** screened the FA change of aptamer probes having TMR label on a specific site of the aptamer upon BPA *** aptamer with a TMR label on the 22nd T base showed large FA-decreasing response to BPA and maintained good binding affinity to *** using this TMR-labeled aptamer,we achieved FA detection of BPA with a detection limit of 0.5μmol/L under the optimized *** assay was selective towards BPA and enabled the detection of BPA spiked in tap water sample,showing the potential applications on water samples.

关键词： Bisphenol A Aptamer Fluorescence anisotropy Fluorescence polarization Microscale thermophoresis Binding affinity

Prolongation Structure of Semi-discrete Nonlinear Evolution Equations

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Communications in Theoretical Physics 2007年第4X期48卷 591-600页

作者： BAI yong-qiang WU Ke GUO Han-Ying zhao Wei-Zhong Institute of Mathematics Henan University Kaifeng 475004 China School of Mathematical Sciences Fudan University Shanghai 200433 China Department of Mathematics Capital Normal University Beijing 100037 China KLMM AMSS the Chinese Academy of Sciences Beijing 100080 China Institute of Theoretical Physics the Chinese Academy of Sciences Beijing 100080 China

Based on noncommutative differential calculus, we present a theory of prolongation structure for semidiscrete non/inear evolution equations. As an illustrative example, a semi-discrete model of the non/inear SchrSding... 详细信息

关键词： noncommutative differential calculus prolongation structure Lax pair

Rapid sensitive fluorescence detection of cadmium(Ⅱ)with pyrene excimer switching aptasensor

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Journal of Environmental Sciences 2023年第11期133卷 1-7页

作者： Hao Yu qiang zhao State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310000China

Heavy metal cadmium(Ⅱ)contamination often occurs,causing great health risk to human due to high toxicity of cadmium(Ⅱ).Rapid,sensitive and simple detection of cadmium(Ⅱ)are of great importance in environmental *** advantage of aptamer in specific recognition,easy modification,and capability of binding-induced structure change,here we reported a simple fluorescent sensor with rapid and sensitive response for Cd^(2+)using aptamer pyrene excimer *** aptamer was labeled with dual pyrene molecules at two ends of the *** binding of Cd^(2+)to this aptamer probe brought the pyrene labels into close proximity and enhanced formation of a pyrene excimer,which generated increased fluorescence at 485 *** measuring the fluorescence of pyrene excimer,we achieved detection of Cd^(2+)with this *** the optimum experimental conditions,the detection limit of Cd^(2+)reached nanomolar *** method was selective and allowed for the detection of Cd^(2+)in tap *** fluorescence aptasensor is promising for rapid detection of Cd^(2+)in broad applications.

关键词： Aptamer Cadmium Pyrene excimer Fluorescence Sensor

Trapped Bose-Einstein condensates in synthetic magnetic field

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Frontiers of physics 2015年第5期10卷 115-120页

作者： qiang zhao qiang Gu Department of Physics University of Science and Technology Beijing Beijing 100083 China School of Science North China University of Science and Technology Tangshan 063009 China

The rotational properties of Bose-Einstein condensates in a synthetic magnetic field are studied by numerically solving the Gross-Pitaevskii equation and comparing the results to those of condensates confined in a rotating trap. It appears to be more difficult to add a large angular momentum to condensates spun up by the synthetic magnetic field than by the rotating trap. However, strength- ening the repulsive interaction between atoms is an effective and realizable route to overcoming this problem and can at least generate vortex-lattice-like structures. In addition, the validity of the Feynman rule for condensates in the synthetic magnetic field is verified.

关键词： Bose-Einstein condensates synthetic magnetic field vortices