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Thermo-Hydraulic Characteristics of Non-Isothermal Batch Transportation Pipeline System with Different Inlet Oil Temperature

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Journal of Thermal Science 2023年第3期32卷 965-981页

作者： CHEN Zhimin YUAN qing JIANG Weixin LI Zongze YU Bo School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China Faculty of Environment and Life Beijing University of TechnologyBeijing 100124China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

The batch transportation process of several kinds of crude oil is accomplished by an entire coupled pipeline system,which exhibits complex thermo-hydraulic *** on the coupled characteristics among soil,pipelines and devices(including pumps,heating furnaces and valves),a coupled simulation model of batch transportation for the crude oil pipeline system is established,and a novel coupled simulation algorithm is *** simulation results are in good agreement with the field data of an actual crude oil pipeline *** addition,based on the numerical simulation,thermo-hydraulic characteristics of pipeline system are investigated,and some new thermo-hydraulic characteristics are *** the batch transportation process with constant flowrate,the change trends of temperature at the outlet of each pipeline segment are hysteretic and the change ranges of temperature become small along *** the adjustment of devices influences thermohydraulic characteristics to some *** the batch transportation process with variable flowrate,the complex thermo-hydraulic characteristics are exhibited,which are induced by the comprehensive influence of the changes of oil type,flowrate and absorbed/released *** with the transportation process with constant flowrate,the high-viscosity oil exhibits similar minimum temperature and lower maximum pressure in the transportation process with variable flowrate,which means that the higher transportation safety of pipeline system is *** study can provide a scientific reference for making the safer batch transportation scheme of crude oil pipeline system.

关键词： crude oil pipeline system batch transportation coupled simulation variable flowrate thermo-hydraulic characteristics

Micro-Nanometer Parasitic Crystal Growth and Photoluminescence Property of Unique Screw-Cone Like Zn_(2)GeO_(4)-ZnO by Combustion Oxidization

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Chinese Physics Letters 2012年第10期29卷 227-230页

作者： yang Xiu-Ying CHENG Jun-Ye LI Bin CAO Wen-Qiang YUAN Jie ZHANG De-qing CAO Mao-Sheng School of Materials Science and Engineering Qiqihar UniversityQiqihar 161006 School of EMPS University College Dublin 4Ireland School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081

screw-cone-like Zn_(2)GeO_(4)-ZnO particles with a base diameter of approximately 400 nm and a height of 400–800 nm or so were successfully synthesised by combustion oxidation of zinc and germanium powder at 960℃.No catalyst or carrier gases were *** and SEM analyses reveal that Zn_(2)GeO_(4) and ZnO grew to parasitic crystals evenly in interaction with each *** images exhibit the homogeneity of the distribution of Ge and *** formation mechanism is discussed and attributed to the unique growth process of the screw-cone-like Zn_(2)GeO_(4)-ZnO particles and its vapour-solid(VS)growth *** addition,the Zn_(2)GeO_(4)-ZnO particles could tune the energy level structure of nano-tetrapod ZnO,which leads to the emission peak redshift from 376 nm to 435 nm and enhances the light emission intensity in the visible light region.

关键词： vapour evenly Crystal

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我国碳金融交易价格监管机制设计

山西财经大学学报 2022年第S1期44卷 58-60页

作者：杨青清巴黎商学院法国巴黎75011

随着全球气候变暖状况的加剧,保护环境和减少碳排放量已经是全人类需要共同面对的重要问题。《京都议定书》中的三项机制,为碳金融衍生品市场和碳排放权的交易提供了基础。对发展中国家和发达国家的碳排放权交易来说,CDM是其中的重要交... 详细信息

随着全球气候变暖状况的加剧,保护环境和减少碳排放量已经是全人类需要共同面对的重要问题。《京都议定书》中的三项机制,为碳金融衍生品市场和碳排放权的交易提供了基础。对发展中国家和发达国家的碳排放权交易来说,CDM是其中的重要交易方式,但由于整体碳交易的标准制定和交易市场都在国外,我国仅是遵从发达国家制定的交易规则,并没有真正地掌握到碳交易的实际定价权。在制定CDM交易机制的过程中,我国处于整体碳交易价值的底端位置,只能被动接受国外碳交易机构制定的碳价格,因此,我国需要加强对碳交易价格监管体制的相关研究,进一步完善我国的碳交易市场,对于促进和优化整体经济的发展来说具有非常重要的现实意义。

关键词：碳金融碳交易监管机制碳价格价格机制

An investigation on catalytic performance and reaction mechanisms of Fe/OMS-2 for the oxidation of carbon monoxide, ethyl acetate, and toluene

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Journal of Environmental Sciences 2022年第2期34卷 258-268页

作者： Ning Dong Mengyue Chen qing Ye Dan Zhang Hongxing Dai Key Laboratory of Beijing on Regional Air Pollution Control Department of Environmental ScienceSchool of Environmental and Chemical EngineeringFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution ControlKey Laboratory of Advanced Functional MaterialsEducation Ministry of Chinaand Laboratory of Catalysis Chemistry and NanoscienceDepartment of Environmental Chemical EngineeringSchool of Environmental and Chemical EngineeringFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

The octahedral molecular sieve(OMS-2)-supported Fe( xFe/OMS-2: x = 1, 3, 5, and 10) catalysts were prepared using the pre-incorporation method. Physicochemical properties of the as-synthesized materials were characterized by means of various techniques, and their catalytic activities for CO, ethyl acetate, and toluene oxidation were evaluated. Among all of the samples, performed the best, with the reaction temperature required to achieve 90% conversion( T 90%) being 160 ℃ for CO oxidation, 210 ℃ for ethyl acetate oxidation, and 285 ℃ for toluene oxidation. Such a good catalytic performance of 5Fe/OMS-2 was associated with its high(Mn^(3+) + Mn^(2+)) content and adsorbed oxygen species concentration, and good lowtemperature reducibility and lattice oxygen mobility as well as strong interaction between Fe and OMS-2. In addition, catalytic mechanisms of the oxidation of three pollutants over the 5Fe/OMS-2 catalyst were also studied. It was found that CO, ethyl acetate or toluene was first adsorbed, then the related intermediates were formed, and finally the formed intermediates were completely converted into CO_(2) and H_(2)O.

关键词： Cryptomelane-type OMS-2 Supported iron catalyst CO oxidation Volatile organic compound oxidation Toluene oxidation

Recent advances in wheel–rail RCF and wear testing

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Friction 2023年第12期11卷 2181-2203页

作者： Sundar SHRESTHA Maksym SPIRYAGIN Esteban BERNAL qing WU Colin COLE Centre for Railway Engineering Central Queensland UniversityRockhampton 4701Australia Australasian Centre for Rail Innovation Canberra 2601Australia

The wear and rolling contact fatigue (RCF) testing approaches for wheels and rails have been reviewedand evaluated in this study. The study points out the advantages and limitations of the existing approaches. Thebroad analysis revealed that scaled laboratory-based wear testing is widely applied. However, it is necessary topredetermine the input parameters and observing parameters for scaled wear testing for three reasons: first, toemulate the real-world scenarios as closely as possible;second, to postprocess the results received from the scaledtesting and transfer them into real practice at full scale;third, to present the results in a legible/appropriate ***, most of the important parameters required for wear testing have been discussed with fundamental andsystematic explanations provided. Additionally, the transition of the parameters from the real-world into the testdomain is explained. This study also elaborates on the challenges of the RCF and wear testing processes andconcludes by providing major considerations toward successful testing.

关键词： wear testing rolling contact fatigue(RCF)testing wheel-rail

The precipitation behaviours and strengthening mechanism of a Cu-0.4 wt% Sc alloy

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Journal of Materials Science & Technology 2022年第3期98卷 1-13页

作者： Zifan Hao Guoliang Xie Xinhua Liu qing Tan Rui Wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Key Laboratory for Advanced Materials Processing of Ministry of Education Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing100083China

The precipitation behaviours during the aging process and the corresponding strengthening mechanism of a Cu-0.4 wt%Sc alloy were systematically investigated in this *** phase transformation sequence of the precipitation in the aging process of the Cu-0.4 wt%Sc alloy was found to be:supersaturated solid solution→Sc-enriched atomic clusters→metastable phase→Cu4Sc *** tetragonal structured lamellar Cu4Sc precipitates,with a habit plane parallel to the{111}plane of the Cu matrix and orientation relationships of(022)_(α)//(211)_(Cu4Sc)and[011]_(α)//[113]_(Cu4Sc),are found homogeneously distributed in the matrix.A combined process of cryogenic rolling(CR)and aging was designed for optimization of the mechanical and electrical *** integration of yield strength(696 MPa)and electrical conductivity(62.8%IACS)of this alloy was achieved by cryogenic rolling and subsequent aging process at 400℃for 4 *** significant precipitation strengthening effect of this alloy is attributed to the Cu4Sc precipitates with an extremely small size of only 1.5–3 *** leading strengthening mechanism is considered as the superposition of both coherent strengthening and Orowan strengthening effects.

关键词： Cu-Sc alloy Precipitation Aging process Strengthening mechanism

Covalent triazine-based frameworks confining cobalt single atoms for photocatalytic CO_(2) reduction and hydrogen production

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Journal of Materials Science & Technology 2022年第21期116卷 41-49页

作者： Guocheng Huang Guiyun Lin qing Niu Jinhong Bi Ling Wu Department of Environmental Science and Engineering Fuzhou UniversityMinhouFujian 350108China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityMinhouFujian 350108China

Single-atom catalysts(SACs)have emerged as an advanced frontier in heterogeneous catalysis due to their potential to maximize the atomic ***,covalent triazine-based frameworks(CTFs)confining cobalt single atoms(Co-SA/CTF)photocatalysts have been synthesized and used for efficient CO_(2) reduction and hydrogen production under visible light *** resulted Co-SA/CTF demonstrate excellent photocatalytic activity,with the CO and H2 evolution rates reaching 1665.74μmol g^(−1) h^(−1) and 1293.18μmol g^(−1) h^(−1),respectively,far surpassing those of Co nanoparticles anchored CTF and pure CTF.A variety of instrumental analyses collectively indicated that Co single atoms sites served as the reaction center for activating the adsorbed CO_(2) molecules,which significantly improved the CO_(2) reduction ***,the introduction of Co single atoms could accelerate the separation/transfer of photogenerated charge carriers,thus boosting the photocatalytic *** study envisions a novel strategy for designing efficient photocatalysts for energy conversion and showcases the application of CTFs as attractive support for confining metal single atoms.

关键词： Covalent triazine-based frameworks Co single atoms Photocatalysis CO_(2)reduction Hydrogen evolution

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一维颗粒声子晶体的拓扑相变及可调界面态

物理学报 2017年第22期66卷 55-62页

作者：李锋黄学勤陆久阳刘正猷华南理工大学物理与光电学院广州510640 武汉大学物理科学与技术学院武汉430072

基于Su-Schrieffer-Heeger模型,构造了一种一维非线性声子晶体,通过调控外加在声子晶体上的预紧力,可调控声子晶体的拓扑态,从而实现拓扑相变.利用这一效应,把该非线性声子晶体与另一线性声子晶体形成异质结构,可以实现一种新型声学开关... 详细信息

基于Su-Schrieffer-Heeger模型,构造了一种一维非线性声子晶体,通过调控外加在声子晶体上的预紧力,可调控声子晶体的拓扑态,从而实现拓扑相变.利用这一效应,把该非线性声子晶体与另一线性声子晶体形成异质结构,可以实现一种新型声学开关:通过调节预紧力即调控非线性声子晶体的拓扑相,可以实现异质结构中界面态从无到有的转变,从而实现了开关效应.利用该效应可望开发新型声学器件,如可调谐振器、可调滤波器、可调隔振器等.

关键词：界面态可调拓扑相变颗粒声子晶体

High tension cyclic hydrocarbons synthesized from biomass-derived platform molecules for aviation fuels in two steps

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Green Energy & Environment 2023年第1期8卷 331-337页

作者： Zhanchao Li Yizhuo Wang qing Li Liqing Xu Hong Wang Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'an710054China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an710054China

Synthesizing ring structure aviation fuels from biomass-derived platform molecules is challenging,especially for bridged ring structure aviation fuels which are typically achieved from fossil-derived ***,we report the synthesis of a series of ring structure biofuels in two steps by a combination of a solvent-free Michael-cyclization reaction and a hydrodeoxygenation(HDO)reaction from lignocellulosederived 5,5-dimethyl-1,*** biofuels are obtained with high overall yields up to 90%,which exhibit high densities of 0.81 g cm^(-3)-0.88 g cm^(-3)and high volumetric neat heat of combustion(VNHOC)values of 36.0 MJ L^(-1)-38.6 MJ L^(-1).More importantly,bridged-ring structure hydrocarbons can also be achieved in two steps by a combination of a Robinson annulation reaction and an HDO reaction to afford the final products at high overall yields up to 90%.The bridged-ring structure products have comparable high densities and high VNHOC values to the best artificial fuel JP-10(0.94 g cm^(-3)and 39.6 MJ L^(-1)).The results demonstrate a promising way for the synthesis of high-density aviation fuels with different fuel properties at high yields.

关键词： Biofuels 5,5-Dimethyl-1,3-cyclohexanedione Solvent-free Michael-cyclization Robinson annulation Green reaction