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Thermodynamic Performance Comparison and Optimization of sCO_(2)Brayton Cycle,tCO_(2)Brayton Cycle and tCO_(2)Rankine Cycle

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Journal of Thermal Science 2023年第2期32卷 611-627页

作者： JIANG Yu zhan.Li tian Xuelian NIE Changhua Nuclear Power Institute of China Chengdu 610213China

In this paper,to further improve thermodynamic performance of supercritical carbon dioxide cycle,simple/recompression transcritical carbon dioxide Brayton cycle(STBC/RTBC)and simple/recompression transcritical carbon dioxide Rankine cycle(STRC/RTRC)are *** and exergy performance analysis and optimization for the above four transcritical CO_(2)cycles and simple/recompression supercritical cycle(SSBC/RSBC)are *** effect of key thermodynamic parameters on those CO_(2)cycle performance is *** indicate that the improvements of thermodynamic performance of CO_(2)cycle are obvious when transcritical Brayton and Rankine cycle are applied in *** the same range of optimization variables,the maximum thermal efficiency improvements of RTRC and RTBC are 4.98%and 3.6%,and maximum exergy efficiency improvements of RTRC and RTBC are 7.08%and 5.13%when compared with ***,the thermodynamic performances of STBC and STRC are also outstanding than that of *** work provides a way to further improve the thermodynamic performance of CO_(2)power cycle.

关键词： thermodynamic performance supercritical carbon dioxide transcritical carbon dioxide Brayton cycle Rankine cycle

Corrosion Resistance and Antifouling Bioinspired Coating with Doped Polyaniline and TO@CA Self-Healing Nanocapsules

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Journal of Bionic Engineering 2023年第6期20卷 2826-2839页

作者： Hongli tian Wenbo Du Yuchao zhan.Limei tian Jie Zhao Jiyu Sun Key Laboratory of Bionic Engineering(Ministry of Education China)Jilin UniversityChangchun130022China National Key Laboratory for Remanufacturing Army Academy of Armored ForcesBeijing100000China

In this study,an integrative bioinspired coating system for antifouling and corrosion resistance was investigated,in which self-healing nanocapsules(tung oil calcium alginate,TO@CA),doped polyaniline and nano-titanium dioxide nanocomposites(SPAn–TiO_(2))and a biostructure metal surface were *** antifouling property of the bioinspired coating resulted from the synergistic antifouling effect of nano-TiO_(2)and acid-doped polyaniline in SPAn–TiO_(2).The protonated nitrogen with a positive charge in SPAn–TiO_(2)and the intrinsic bactericidal property of nano-TiO_(2)could damage negatively charged single-celled chlorella,endowing the composite coating with good antifouling performance(less algae attached on the surfaces after a 90-day antifouling test and a conductivity test).The composite bioinspired coating had excellent corrosion resistance,which was due to the good synergistic anticorrosion barrier effect of SPAn–TiO_(2)with TO@CA nanocapsules and the repairing ability of microcracks of TO@CA nanocapsules during the corrosion *** bioinspired coating with 2 wt%SPAn–TiO_(2)and 2 wt%TO@CA nanocapsules exhibited a better adhesion,corrosion resistance and antifouling performance than the other coatings did.

关键词： Corrosion resistance Antifouling Self-healing Multifunctional bioinspired coating Doped polyaniline

基于HS-SPME-GC-MS比较分析不同原料对葱香油风味品质的影响

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食品工业科技 2025年第2期46卷 250-257页

作者：张萌王鹏耿敬章詹萍田洪磊陕西师范大学食品工程与营养科学学院陕西理工大学生物科学与工程学院

为探究葱品种对炸制葱香油香气组成的影响，选用三种市售葱为原料，花生油为载体油脂，葱碎于130℃炸制3 min获得葱香油样本（大葱炸制油Fried Dacong Oil,DFO；红葱炸制油Fried Hongcong Oil,HFO及香葱炸制油Fried Xiaocong Oil,XFO）... 详细信息

为探究葱品种对炸制葱香油香气组成的影响，选用三种市售葱为原料，花生油为载体油脂，葱碎于130℃炸制3 min获得葱香油样本（大葱炸制油Fried Dacong Oil,DFO；红葱炸制油Fried Hongcong Oil,HFO及香葱炸制油Fried Xiaocong Oil,XFO），采用定量描述性感官分析（Quantitative descriptive sensory analysis,QDA）和顶空固相微萃取-气相色谱-质谱联用仪（Headspace-solid phase microextraction-gas chromatography-mass spectrometry,HS-SPME-GC-MS）对比分析不同样本间挥发性物质组成差异，并结合多元统计分析筛选造成3个葱香油之间感官属性强度产生差异的关键物质。感官评价结果表明相同工艺参数下所制备的葱香油，XFO表现出较强的葱香味和脂香味，浓郁度高，油腻和辛辣感较弱；GC-MS共分离鉴定出66种物质，利用正交偏最小二乘分析（Orthogonal partial least squares discrimination analysis,OPLS-DA）筛选出18种导致3种葱香油呈香特征产生差异的关键物质。相对香气活性值（Relative odor activity value,ROAV）分析结果表明，2-乙基-6-甲基吡嗪、丙醛、2,6-二乙基吡嗪、苯甲醛、愈创木酚、苯甲醇、5-甲基呋喃醛、2-乙酰基吡嗪、2-正戊基呋喃、3-乙基-2,5-二甲基-吡嗪、（E）-2-辛烯醛、2-吡咯甲醛、N-甲基-2-吡咯甲醛及2,3,5-三甲基吡嗪是引起葱香油样品风味品质差异的物质。与其他两种葱香油相比，XFO得到小组成员喜爱，符合对葱香油香气轮廓预期。本研究利用HS-SPME-GC-MS筛选出与葱香油相关的差异物质，可为我国后期高品质葱香调味油标准化加工奠定理论基础。

关键词：葱白挥发性物质炸制差异成分

来源：博看期刊

Discrete and continuum modeling of granular flow in silo discharge

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Particuology 2018年第1期16卷 127-138页

作者： tian tian Jinglin Su Jinhui zhan.Shujun Geng Guangwen Xu Xiaoxing Liu State Key Laboratory of Multi-Phase Complex System Institute of Process Engineering Chinese Academy of Science Beijing 100190 China University of Chinese Academy ofSdences Beijing 100049 China Sino-Danish Center for Education and Research Beijing 100190 China

Granular material discharge from a flat-bottomed silo has been simulated by using continuum modeling and a three-dimensional discrete-element method （DEM）. The predictive abilities of three commonly used frictional viscosity models （Schaeffer, S-S, and μ（I）） were evaluated by comparing them with the DEM data. The funnel-flow pattern （type C） and the semi-mass-flow pattern （type B） that was predicted by DEM simulations can be represented when the Schaeffer orμ（I） model is used, whereas the S-S model gives a consistent type-B flow pattern. All three models over-estimate the discharge rate compared with the DEM. The profiles of the solids volume fraction and the vertical velocity above the outlet show that the larger discharge rates given by the Schaeffer and μ（I） model result from an over-estimation of volume fraction, whereas the deviation in the S-S model stems from the failure to predict a solid vertical velocity and a volume fraction.

关键词： Silo Flow pattern Discharge rate Discrete-element model Frictional viscosity model

Research on theoretical and numerical methods of single bubble oscillation

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Journal of Hydrodynamics 2021年第4期33卷 872-877页

作者： Jie-min zhan.Yue-han Chen Yu-tian Li Department of Applied Mechanics and Engineering Sun Yat-sen UniversityGuangzhou510275China

A comparison of theoretical investigation and numerical simulation of a single bubble oscillation is carried out in this *** theoretical research is based on solving Rayleigh-Plesset(R-P)equation and Keller-Miksis(K-M)equation using Runge-Kutta *** numerical method focuses on the two discrete methods in the volume of fluid(VOF)method,geometric reconstruction(GR)and modified high resolution interface capturing(MHRIC).The results show that the interface captured by MHRIC in the collapse stage is more stable,and the evolution of bubble radius agrees better with the theoretical *** R-P equation and K-M equation,which omit the effect of the energy equation,have limitations when the bubble collapses under ultra-high pressure.

关键词： Cavitation bubble dynamics volume of fluid method geometric reconstruction(GR)

Synthesis,properties,and self-assembly of 2,3-bis(n-octyl)hexaazatriphenylene

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Chinese Chemical Letters 2013年第6期24卷 453-456页

作者： Zhi-Gang Tao tian-Guang zhan.tian-You Zhou Xin Zhao zhan.Ting Li Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

A hexaazatriphenylene（HAT） derivative that bears two n-octyl chains was designed and *** photophysical and electrochemical properties have been *** study revealed that it could self-assemble into well-ordered 1D nan... 详细信息

关键词： Hexaazatriphenylene Self-assembly Microsheets Nanoribbons

Recovery of zinc from Zn-Al-Fe alloys by gas pressure filtration

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Journal of Iron and Steel Research International 2020年第11期27卷 1322-1330页

作者： tian-yang Li Zhe Wang Lei Guo zhan.cheng Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The recovery of zinc from galvanizing dross and the removal of iron contained dross particles by gas pressure filtration were investigated using the model of Zn-Fe-Al *** majority of molten zinc was separated after filtration,and the residue intercepted by the filter consisting mostly of dross *** effects of the pressure differential(p),separation temperature(T)and alloy composition on the zinc recovery and iron removal were *** p=0.30 MPa and T=723 K,86.2 wt.%zinc was recovered from the Zn-4Al-2Fe alloy,and up to 99.9 wt.%of the iron was concentrated in the *** a higher pressure differential led to the improved filtration efficiency,and the desired separation temperature was about 723 *** aluminum content in the Zn-Al-Fe alloy had little effect on separation efficiency,whereas increasing the iron content led to a decrease in the separation *** findings demonstrate the potential of the gas pressure filtration method for the recovery of zinc from galvanizing dross.

关键词： Galvanizing dross Gas pressure filtration Zinc recovery Iron removal Separation

Preparation of Polyimide/BaTiO_3/Ag Nanocomposite Films via in situ Technique and Study of Their Dielectric Behavior

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Chinese Journal of Polymer Science 2014年第4期32卷 424-431页

作者： Jia-yu zhan.Guo-feng tian zhan.peng Wu Sheng-li Qi 武德珍 State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing Building Materials Academy of Science Research/State Key Laboratory of Solid Waste Reuse for Building Materials

Triphase polyimide nanocomposite films were fabricated using barium titanate （BaTiO3） with high dielectric constant and silver （Ag） with high conductivity as fillers. In situ method was utilized to obtain the homogeneous dispersion of nanoparticles. The in situ polymerization of polyimide precursor-poly（amic acid） was performed in the presence of BaTiO3 particles. Silver compound 1,1,1-trifluoro-2,4-pentadionato silver（I） was added into the BaTiO3 containing poly（amic acid） solution to achieve silver nanoparticles via in situ self metallization technique. The thermally induced reduction converted silver （I） to metallic silver with concomitant imidization of poly（amic acid） to polyimide. Both BaTiO3 and silver nanoparticles were uniformly dispersed in the polyimide substrate. The dependence of dielectric behavior on the BaTiO3 and Ag contents was studied. The incorporation of small amount of silver nanoparticles greatly increased dielectric constant of composite films.

关键词： Polyimide Silver Barium titanate Nanocomposites Dielectrics.

Application of response surface methodology in optimizaing thesulfation-roasting-leaching process of nickel laterite

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International Journal of Minerals,Metallurgy and Materials 2012年第3期19卷 199-204页

作者： Xue-yi Guo Dong Li zhan.Wu Qing-hua tian School of Metallurgical Science and Engineering Central South UniversityChangsha 410083China

Nickel was recovered from nickel laterite using a sulfation-roasting-leaching process and the effects of operation parameters in- cluding acid addition, roasting temperature, and roasting time on nickel extraction and iron dissolution were investigated using response sur- face methodology （RSM）. Two second-order polynomial models of high significance were presented to show the relationship between the responses and the variables. The analysis of variance （ANOVA） showed high coefficients of determination （R2） of 0.894 and 0.980 for the two models, respectively. Optimum areas of 〉-80% Ni extraction and 〈5% Fe dissolution were obtained by the overlaid contours. Verification experiments in the optimum areas were conducted and the results indicate a close agreement with the predicted values obtained from the models.

关键词： nickel laterite sulfation roasting leaching optimization response surface methodology