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Journal of Environmental Sciences 2013年第1期25卷 213-219页

作者： yifei sun Nobuhisa Watanabe Wei Wang Tianle Zhu School of Chemistry and Environment Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of EducationBeihang University Department of Environmental Engineering Osaka Institute of Technology School of Environment Tsinghua University

A group parameter approach using ＂total organic halogen＂ is effective for monitoring gaseous organic halogen compounds, including fluorine, chlorine, and bromine compounds, generated from combustion. We described the use of barrier-discharge radiofrequency- helium-plasma/atomic emission spectrometry, for the detection of semi- and low-volatile organic halogen compounds （SLVOXs）, which can be collected by CarbotrapTM adsorbents and analyzed using thermal desorpfion. The optimal carder gas flow rates at the injection and desorption lines were established to be 100 mL/min. The detection range for SLVOXs in the gaseous samples was from 10 ng to tens of micrograms. Measuring F was more difficult than measuring C1 or Br, because the wavelength of F is close to that of air. The barrier- discharge radiofrequency-helium-plasma/atomic emission spectrometry measured from 85% to 103% of the SLVOXs in the gas sample. It has been found that Carbotrap B is appropriate for high-boiling-point compounds, and Carbotrap C is suitable for the determination of organic halogen compounds with lower boiling points, in the range 200-230℃. Under optimal analysis conditions, a chlorine- containing plastic was destroyed using different oxygen concentrations. Lower oxygen concentrations resulted in the production of lower amounts of organic halogen compounds.

关键词： organic halogen semi- and low-volatile organic halogen radiofrequency helium plasma desorption

Modelling long-term deformation of granular soils incorporating the concept of fractional calculus

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Acta Mechanica Sinica 2016年第1期32卷 112-124页

作者： yifei sun Yang Xiao Changjie Zheng Khairul Fikry Hanif Faculty of Engineering and Information Sciences University of Wollongong College of Civil Engineering Chongqing University ARC Centre of Excellence for Geotechnical Science and Engineering University of Newcastle Faculty of Engineering Computing and MathematicsUniversity of Western Australia

Many constitutive models exist to characterise the cyclic behaviour of granular soils but can only simulate deformations for very limited cycles. Fractional derivatives have been regarded as one potential instrument for modelling memory-dependent phenomena. In this paper, the physical connection between the fractional derivative order and the fractal dimension of granular soils is investigated in detail. Then a modified elasto-plastic constitutive model is proposed for evaluating the long-term deformation of granular soils under cyclic loading by incorporating the concept of fac- tional calculus. To describe the flow direction of granular soils under cyclic loading, a cyclic flow potential consider- ing particle breakage is used. Test results of several types of granular soils are used to validate the model performance.

关键词： Constitutive model Fractional order Fractional calculus Long-term deformation

晚清《点石斋画报》中海派建筑图像的个案解析——基于“焦点透视”的研究切入

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北方建筑 2024年第2期9卷 57-60页

作者：孙艺菲杨涵雨邰杰江苏理工学院艺术设计学院江苏常州213159 江苏理工学院创新设计研究院江苏常州213001

本文以《点石斋画报》为研究对象,梳理了《点石斋画报》相关背景及其在我国近代出版史上的地位,阐释了蕴涵其中的建筑历史图像、“焦点透视”的绘制原理等方面的中西交融特质,并借助计算机辅助设计软件对个案图像的环境场景进行设计复... 详细信息

本文以《点石斋画报》为研究对象,梳理了《点石斋画报》相关背景及其在我国近代出版史上的地位,阐释了蕴涵其中的建筑历史图像、“焦点透视”的绘制原理等方面的中西交融特质,并借助计算机辅助设计软件对个案图像的环境场景进行设计复原研究。同时强调了画报本身具有重要的建筑史学参考价值。其中,最为关键的是,历史图像文本能够为当下建筑设计提供诸多创意性素材引用的史学参照,在历史建筑保护、文旅景区开发等建造活动中,也可发挥“建筑史图谱”之功用。

关键词：《点石斋画报》海派建筑图像 “焦点透视” 《莽汉寻花》

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五种野生血芝的驯化栽培及其抗氧化活性

菌物学报 2024年第6期43卷 156-167页

作者：肖自添何焕清彭洋洋刘明徐江邱远辉孙一翡崔宝凯广东省农业科学院蔬菜研究所、广东省蔬菜新技术重点实验室广东广州510640 北京林业大学生态与自然保护学院林木资源高效生产全国重点实验室北京100083

血芝属是灵芝科真菌的重要类群,研究发现该属真菌具有多种生理功能,并且部分活性优于多种已被熟知的食药用菌。本研究以5种野生血芝Sanguinoderma spp.为研究对象进行驯化栽培,以期了解其栽培特性和抗氧化活性、探究其开发利用价值。结... 详细信息

血芝属是灵芝科真菌的重要类群,研究发现该属真菌具有多种生理功能,并且部分活性优于多种已被熟知的食药用菌。本研究以5种野生血芝Sanguinoderma spp.为研究对象进行驯化栽培,以期了解其栽培特性和抗氧化活性、探究其开发利用价值。结果显示,5种血芝菌株菌丝最适生长温度不同,在25–30℃之间,子实体从原基发生到采收需要25–38 d不等,乌血芝生长快,孢子粉弹射早,血芝生长最慢,栽培期内未见孢子粉弹射。不同菌株的栽培子实体性状差异显著,菌盖长4.96–12.56 cm,宽3.84–10.76 cm,菌盖颜色灰褐色、灰黑色、黑色和米红色;菌柄长0–10.1 cm不等,菌盖扇形、肾形至近圆形。各菌株一茬生物转化率为6.59%–18.34%,子实体粗多糖含量为1.89%–2.95%,总三萜为0.78%–1.68%。与赤灵芝、紫灵芝、白肉灵芝相比,血芝属菌株抗氧化效果更好,其中血芝、小孔血芝粗多糖溶液、总三萜溶液浓度分别在3 mg/mL、1 mg/mL时DPPH自由基清除率达80%以上,总抗氧化自由基清除率达28%以上。血芝属真菌生长快,子实体多糖、三萜含量较高,具有较好的抗氧化应用潜力。

关键词：野生血芝子实体多糖抗氧化三萜

Promoting effect of Zr on the catalytic combustion of methane over Pd/γ-Al2O3 catalyst

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Frontiers of Environmental Science & Engineering 2014年第5期8卷 659-665页

作者： Hongbo NA Tianle ZHU Zhiming LIU yifei sun School of Chemistry and Environment Key Laboratory of Bio-Inspired Smart Interracial Science and Technology of Ministry of Education Beihang University Beijing 100191 China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China

The effect of Zr on the catalytic performance of Pd/y-A1203 for the methane combustion was investigated. The results show that the addition of Zr can improve the activity and stability of Pd/γ-Al2O3 catalyst, which, based on the catalyst characterization （N2 adsorption, XRD, CO- Chemisorption, XPS, CHa-TPR and O2-TPO）, is ascribed to the interaction between Pd and Zr. The active phase of methane combustion over supported palladium catalyst is the Pd^0/Pd^2＋ mixture. Zr addition inhibits Pd aggregation and enhances the redox properties of active phase Pd^0/ Pd^2＋. H2 reduction could effectively reduce the oxidation degree of Pd species and regenerate the active sites （Pd^0/ pd^2＋）.

关键词： Pd-Zr/Al2O3 methane catalytic combustion,catalyst regeneration

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基于教研平衡的高校大型仪器开放共享新思路

科教导刊 2024年第15期 32-34页

作者：孙逸菲岳中玉赵飞杭州师范大学药学院浙江杭州311121

大型仪器设备是高校教学和科研的重要基础和条件,其开放共享是高校资源科学管理的内在要求之一。大型仪器设备开放共享平台建设有其客观规律,面对新时代的各类内在矛盾,开放共享平台的建设也是一个动态变化、逐步完善的过程。本研究从... 详细信息

大型仪器设备是高校教学和科研的重要基础和条件,其开放共享是高校资源科学管理的内在要求之一。大型仪器设备开放共享平台建设有其客观规律,面对新时代的各类内在矛盾,开放共享平台的建设也是一个动态变化、逐步完善的过程。本研究从“教学―科研”相平衡角度出发,分析当前开放共享平台存在的问题及应对策略,提出“教学―科研”动态平衡的重要性,正视“教学实验”对高校大型仪器设备平台建设的正反馈作用,改革大型仪器设备平台参与“学科竞赛”的方式,更好地服务于高校“双一流”建设。

关键词：大型仪器设备开放共享实验教学学科竞赛平台

Anaerobic co-digestion of municipal biomass wastes and waste activated sludge: Dynamic model and material balances

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Journal of Environmental Sciences 2013年第10期25卷 2112-2122页

作者： yifei sun Dian Wang Wei Qiao Wei Wang Tianle Zhu School of Chemistry and Environment Beihang University College of Chemical Science and Engineering China University of Petroleum School of Environment Tsinghua University

The organic matter degradation process during anaerobic co-digestion of municipal biomass waste （MBW） and waste-activated sludge （WAS） under different organic loading rates （OLRs） was investigated in bench-scale and pilot-scale semi-continuous stirred tank reactors. To better understand the degradation process of MBW and WAS co-digestion and provide theoretical guidance for engineering application, anaerobic digestion model No. 1 was revised for the co-digestion of MBW and WAS. The results showed that the degradation of organic matter could be characterized into three different fractions, including readily hydrolyzable organics, easily degradable particulate organics, and recalcitrant particle organics. Hydrolysis was the rate-limiting step under lower OLRs, and methanogenesisis was the rate-limiting step for an OLR of 8.0 kg volatile solid （VS）/（m^3·day）. The hydrolytic parameters of carbohydrate, protein, and lipids were 0.104, 0.083, and 0.084 kg chemical oxygen demand （COD）/（kg COD·hr）, respectively, and the reaction rate parameters of lipid fermentation were 1 and 1.25 kg COD/（kg ***） for OLRs of 4.0 and 6.0 kg VS/（m^3·day）. A revised model was used to simulate methane yield, and the results fit well with the experimental data. Material balance data were acquired based on the revised model, which showed that 58.50% of total COD was converted to methane.

关键词： anaerobic digestion material balances kinetic parameters modelling municipal biomass waste

Maximum power and corresponding efficiency of an irreversible blue heat engine for harnessing waste heat and salinity gradient energy

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Science China(Technological Sciences) 2022年第3期65卷 646-656页

作者： LIN Jian XIE Shan JIANG ChenXing sun yifei CHEN JinCan ZHAO YingRu College of Energy Xiamen UniversityXiamen 361002China Department of Physics Xiamen UniversityXiamen 361002China

In this study,a novel irreversible cyclic model of a capacitive mixing blue heat engine mainly consisting of super capacitors,charging and discharging circuits,a heat source,as well as two water sources with given salt concentrations is established for harvesting salinity gradient energy and waste ***,the effects of the charging voltage and ratio of the minimum to maximum surface electric charge density on the thermodynamic efficiency and power output of the cycle are *** maximum power output of the cycle is *** optimized ranges of efficiency and power output as well as the temperatures of two isothermal processes are *** is established that during the isoelectric quantity process,there is not only an increase in thermal voltage owing to the temperature difference,but also an increase in concentration voltage owing to the salinity ***,the blue heat engine can obtain higher energy conversion efficiency than a conventional heat *** the temperature ratio of the heat source to the heat sink is 1.233,the maximum efficiency can reach approximately36%.The results obtained can promote the application of capacitive mixing technology in real life,reducing the consumption of fossil fuels.

关键词： blue heat engine capacitance mixing salinity gradient energy thermodynamic analysis efficiency at maximum power output

大跨径空间索面斜拉桥混凝土锚块参数求解及配筋设计

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山东交通科技 2024年第1期 92-96页

作者：孙义斐黄月超张明昊中交公路规划设计院有限公司北京100088

以广西横钦郁江大桥为例,采用空间解析几何方法推导了适用于空间索面斜拉桥的混凝土锚块参数求解公式,结合数据处理软件可实现批量化求解,提高设计效率;采用三维实体有限元法计算分析了混凝土锚块的空间受力行为,并结合规范公式对锚块... 详细信息

以广西横钦郁江大桥为例,采用空间解析几何方法推导了适用于空间索面斜拉桥的混凝土锚块参数求解公式,结合数据处理软件可实现批量化求解,提高设计效率;采用三维实体有限元法计算分析了混凝土锚块的空间受力行为,并结合规范公式对锚块进行了配筋设计,避免运营阶段裂缝的产生。

关键词：桥梁工程斜拉桥混凝土锚块参数化配筋设计

Model predictions for behaviors of sand-nonplastic-fines mixtures using equivalent-skeleton void-ratio state index

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Science China(Technological Sciences) 2017年第6期60卷 878-892页

作者： XIAO Yang sun yifei LIU HanLong XIANG Jia MA QiFeng LONG LeiHang Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing 400045 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400030 China School of Civil Engineering Chongqing University Chongqing 400045 China Faculty of Engineering and Information Sciences University of Wollongong Wollongong 2522 Australia

It is a challenge to suggest a constitutive model for describing the stress-strain behavior of sand-fines mixtures due to that these granular mixtures exhibited very complex behaviors at different densities, pressures and fines contents. In this study, an elastoplastic constitutive model within the framework of the bounding surface plasticity and critical state theories was proposed for sand-nonplastic-fines mixtures by using the concept of the equivalent-skeleton void ratio and equivalent-skeleton void-ratio state index. The proposed model with a set of material constants calibrated from a few tests could be used to model the fines-dependent and state-dependent behaviors of the sand-nonplastic-fines mixture including the strain- softening and volumetric-expansion behaviors in the drained triaxial compression tests, and also the effects of fines content on the critical state lines in both the deviatoric stress versus mean effective stress and the void ratio versus mean effective stress planes.

关键词： sand fines equivalent-skeleton void ratio critical-state strength dilatancy constitutive model