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Relationship between hydrogenation degree and pyrolysis performance of jet fuel

Chinese Journal of Chemical Engineering 2024年第4期68卷 35-42页

作者： Qing Liu Tinghao Jia Lun Pan Jijun Zou Xiangwen Zhang key laboratory for Green Chemical and technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe laboratory of Sustainable Chemical Transformations Tianjin 300192China zhejiang Institute of Tianjin University Ningbo 315201China zhejiang Provincial key laboratory of Advanced Chemical Engineering Manufacture technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China

Understanding the relationship between the chemical composition and pyrolysis performance of endothermic hydrocarbon fuel(EHF) is of great significance for the design and optimization of advanced EHFs. In this work, the effect of deep hydrogenation on the pyrolysis of commercial RP-3 is *** with different hydrogenation degrees were obtained by the partially and completely catalytic hydrogenation and their pyrolysis performances were investigated using an apparatus equipped with an electrically heated tubular reactor. The results show that with the increase of hydrogenation degree, fuel conversion almost remains constant during the pyrolysis process(500-650°C, 4 MPa);however, the heat sink increases slightly, and the anti-coking performance significantly improves, which are highly related to their H/C ratios. Detailed characterisations reveal that the difference of the pyrolysis performance can be ascribed to the content of aromatics and cycloalkanes: the former are prone to initiate secondary reactions to form coking precursors, while the latter could act as the hydrogen donor and release hydrogen, which will terminate the radical propagation reactions and suppress the coke deposition. This work should provide the guidance for upgrading EHFs by modulating the composition of EHFs.

关键词： RP-3 Fuel Pyrolysis Hydrogenation Deposition

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GPa-level pressure-induced enhanced corrosion resistance in TiZrTaNbSn biomedical high-entropy alloy

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China Foundry 2024年第3期21卷 265-275页

作者： Xiao-hong Wang Yu-lei Deng Qiao-yu Li Zhi-xin Xu Teng-fei Ma Xing Yang Duo Dong Dong-dong Zhu Xiao-hong Yang key laboratory of Air-driven Equipment technology of zhejiang Province Quzhou UniversityQuzhou 324000ZhejiangChina School of Materials Science and Engineering Taizhou UniversityTaizhou 318000ZhejiangChina

TiZrTaNb-based high-entropy alloys(HEAs)are research frontier of biomedical materials due to their high hardness,good yield strength,excellent wear resistance and corrosion ***,as an essential trace element in the human body that plays a significant role in physiological *** has stable chemical properties and a low elastic *** this study,a new material,TiZrTaNbSn HEAs,was proposed as a potential biomedical *** Ti_(35)Zr_(25)Ta_(15)Nb_(15)Sn_(10)biomedical high-entropy alloys(BHEAs)were successfully prepared through an arc melting furnace and then remelted using a German high-temperature and high-pressure apparatus under GPa-level(4 GPa and 7 GPa).The precipitation behavior of the needle-like HCP-Zr_(5)Sn_(3)phase that precipitates discontinuously at the grain boundary was successfully *** phase constitution,microstructure,and corrosion resistance of the alloy were *** results show that the needle-like HCP-Zr_(5)Sn_(3)phase is eliminated and the(Zr,Sn)-rich nano-precipitated phase is precipitated in the microstructure under high pressure,which leads to the narrowing of grain boundaries and consequently improves the corrosion resistance of the *** addition,the formation mechanisms of(Zr,Sn)-rich nanoprecipitates in BHEAs were *** Zr and Sn dissolve in the matrix due to the effect of high pressure,during the cooling process,they precipitate to form a(Zr,Sn)-rich nano-precipitated phase.

关键词： biomedical HEAs precipitation grain boundary corrosion resistance TiZrTaNbSn

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基于全局热网络和局部流体动力学建模的全封闭永磁牵引电机热性能优化（英文）

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Journal of zhejiang University-Science A(Applied Physics & Engineering) 2018年第11期19卷 878-888页

作者： Wei CHEN Gui-chu WU You-tong FANG Ji-en MA key laboratory of low-voltage apparatus intellectual technology of zhejiang Wenzhou University College of Electrical Engineering Zhejiang University

目的:提出一种适用于全封闭冷却结构的电机热性能优化模型,设计一台600 kW的高速列车用永磁牵引电机。创新点:1.通过耦合局部流体动力学模型的方法求解电机复杂冷却风道内的对流传热系数,并在全局热网络模型的框架内得到快速、准确的电... 详细信息

目的:提出一种适用于全封闭冷却结构的电机热性能优化模型,设计一台600 kW的高速列车用永磁牵引电机。创新点:1.通过耦合局部流体动力学模型的方法求解电机复杂冷却风道内的对流传热系数,并在全局热网络模型的框架内得到快速、准确的电机温升结果以用于结构优化;2.在冷却风道中引入栅格结构,采用热性能分析模型优化冷却结构,提升电机热性能;3.通过三维流体动力学模型计算电机局部温升最大值,并提山一种预测特定结构下电机铁损工作阈值的工程方法。方法:1.采用热网络法建立全局热网络模型(图3),并通过耦合局部流体动力学模型计算风道内的热网络参数(图4和6); 2.应用田口设计法对电机风道结构进行优化,并研制样机进行验证(计算与试验结果见表5); 3.假设铁损的谐波附加值与磁密值成正比,通过三维流体动力学模型计算给山端部绕组、永磁体温升值与铁损的预测曲线,并用样机试验进行验证。结论:1.采用全局热网络和局部流体动力学建模的方法可以快速、正确地计算复杂冷却结构下的电机温升分布,且优化后的冷却结构至少可以提升文中电机15%的热性能;2.本文提出的优化模型适用于全封闭风冷或者水冷等冷却结构相对独立且尚无经验公式可参考的电机热性能优化设计;3.铁损工作阈值的预测方法可以为电磁和控制系统设计提供参考。

关键词：热网络模型流体动力学永磁电机全封闭强制风冷

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Study on Reliability for Automatic Transfer Switching Equipment

Study on Reliability for Automatic Transfer Switching Equipm...

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The 26th International Conference on Electrical contacts and the 4th International Conference on Reliability of Electrical Products & Electrical Contacts

作者： Lu Jianguo Luo Yanyan li Wenhua Zhao Sheng Province-Ministry Joint key laboratory of Electromagnetic Field and Electrical apparatus Reliability Hebei University of Technology The key laboratory of low-voltage apparatus intellectual technology of zhejiang Wenzhou University

ISBN: (纸本)9781622763139;1622763130

As the automatic transfer switching equipments (ATSE) are widely used on distribution *** are mainly used to switch the load automatically and ensure the security and reliability of power ***,the reliability of ATSE is extremely *** paper mainly includes:1) to analyze the failure modes of ATSE;2)to establish the reliability characteristic parameters of ATSE;3) to discuss the test methods of reliability demonstration test in details.

关键词： reliability test methods ATSE

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Analytical evaluation of steady-state solute distribution in through- diffusion and membrane behavior test under non-perfectly flushing boundary conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 258-267页

作者： Guannian Chen Yuchao Li Kristin MSample-Lord Shan Tong School of Civil&Environmental Engineering and Geography Science Ningbo UniversityNingbo315211China MOE key laboratory of Soft Soils and Geoenvironmental Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou310058China Ningbo ZCONE High-tech Company Limited Ningbo315000China Department of Civil and Environmental Engineering Villanova UniversityVillanovaPAUSA

The through-diffusion and membrane behavior testing procedure using a closed-system apparatus has been widely used for concurrent measurement of diffusion and membrane efficiency coefficients of low-permeability clay-based barrier ***,the common assumption of perfectly flushing conditions at the specimen boundaries could induce errors in analyses of the diffusion coefficients and membrane *** this study,an innovative pseudo three-dimensional(3D)analytical method was proposed to evaluate solute distribution along the boundary surfaces of the soil-porous disks system,considering the non-perfectly flushing *** results were consistent with numerical models under two scenarios considering different inflow/outflow *** proposed model has been demonstrated to be an accurate and reliable method to estimate solute distributions along the *** calculated membrane efficiency coefficient and diffusion coefficient based on the proposed analytical method are more accurate,resulting in up to 50%less relative error than the traditional approach that adopts the arithmetic mean value of the influent and effluent *** retar-dation factor of the clay specimen also can be calculated with a revised cumulative mass ***,the simulated transient solute transport matched with experimental data from a multi-stage through-diffusion and membrane behavior test,validating the accuracy of the proposed method.

关键词： Diffusion testing Membrane behavior Coupled transport Clay barrier Transport modeling

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Identification of Important FPGA Modules Based on Complex Network

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Computers, Materials & Continua 2024年第1期78卷 1027-1047页

作者： Senjie Zhang Jinbo Wang Shan Zhou Jingpei Wang Zhenyong Zhang Ruixue Wang School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing101408China technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing100094China College of Control Science and Engineering Zhejiang UniversityHangzhou310063China College of Computer Science and technology Guizhou UniversityGuiyang550025China

The globalization of hardware designs and supply chains,as well as the integration of third-party intellectual property(IP)cores,has led to an increased focus from malicious attackers on computing ***,existing defense or detection approaches often require additional circuitry to perform security verification,and are thus constrained by time and resource *** the scale of actual engineering tasks and tight project schedules,it is usually difficult to implement designs for all modules in field programmable gate array(FPGA)*** studies have pointed out that the failure of key modules tends to cause greater damage to the ***,under limited conditions,priority protection designs need to be made on key modules to improve protection *** have conducted research on FPGA designs including single FPGA systems and multi-FPGA systems,to identify key modules in FPGA *** the single FPGA designs,considering the topological structure,network characteristics,and directionality of FPGA designs,we propose a node importance evaluationmethod based on the technique for order preference by similarity to an ideal solution(TOPSIS)***,for the multi-FPGA designs,considering the influence of nodes in intra-layer and inter-layers,they are constructed into the interdependent network,and we propose a method based on connection strength to identify the important ***,we conduct empirical research using actual FPGA designs as *** results indicate that compared to other traditional indexes,node importance indexes proposed for different designs can better characterize the importance of nodes.

关键词： Hardware security FPGA circuits node importance interdependent network

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Investigation on a vertical radial flow adsorber designed by a novel parallel connection method

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Chinese Journal of Chemical Engineering 2018年第3期26卷 484-493页

作者： Zhengshu Dai Meng Yu Daozhe Rui Xuejun Zhang Yang Zhao School of Energy and Power Engineering University of Shanghai for Science and Technology key laboratory of Refrigeration and Cryogenic technology of zhejiang Province Institute of Refrigeration and Cryogenics Zhejiang University

Due to the increasing global demand for industrial gas, the development of large-scale cryogenic air separation systems has attracted considerable attention in recent years. Increasing the height of the adsorption bed in a vertical radial flow adsorber used in cryogenic air separation systems may efficiently increase the treatment capacity of the air in the adsorber. However, uniformity of the flow distribution of the air inside the adsorber would be deteriorated using the height-increasing method. In order to reduce the non-uniformity of the flow distribution caused by the excessive height of adsorption bed in a vertical radial flow adsorber, a novel parallel connection method is proposed in the present work. The experimental apparatus is designed and constructed; the Computational Fluid Dynamics(CFD) technique is used to develop a CFD-based model, which is used to analyze the flow distribution, the static pressure drop and the radial velocity in the newly designed adsorber. In addition, the geometric parameters of annular flow channels and the adsorption bed thickness of the upper unit in the parallelconnected vertical radial flow adsorber are optimized, so that the upper and lower adsorption units could be penetrated by air simultaneously. Comparisons are made between the height-increasing method and the parallel connection method with the same adsorber height. It is shown that using the parallel connection method could reduce the difference between the maximum and minimum radial static pressure drop by 86.2% and improve the uniformity by 80% compared with those of using the height-increasing method. The optimal thickness ratio of the upper and lower adsorption units is obtained as 0.966, in which case the upper and lower adsorption units could be penetrated by air simultaneously, so that the adsorbents in adsorption space could be used more efficiently.

关键词： Air separation Purification Vertical radial flow adsorber Flow distribution Optimization

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Electrocatalytic reduction of NO to NH_(3) in ionic liquids by P-doped TiO_(2) nanotubes

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Frontiers of Chemical Science and Engineering 2023年第6期17卷 726-734页

作者： Shangcong Zhang Qian Liu Xinyue Tang Zhiming Zhou Tieyan Fan Yingmin You Qingcheng Zhang Shusheng Zhang Jun Luo Xijun Liu College of Electrical and Electronic Engineering Wenzhou UniversityWenzhou 325035China low voltage apparatus technology Research Centre of zhejiang Wenzhou UniversityWenzhou 325035China Institute for Advanced Study Chengdu UniversityChengdu 610106China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou 325035China College of Chemistry Zhengzhou UniversityZhengzhou 450000China Tianjin key Lab for Photoelectric Materials&Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China State key laboratory of Featured Metal Materials and Life-cycle Safety for Compesite Structures School of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China

Designing advanced and cost-effective electrocatalytic system for nitric oxide(NO)reduction reaction(NORR)is vital for sustainable NH_(3) production and NO removal,yet it is a challenging ***,it is shown that phosphorus(P)-doped titania(TiO_(2))nanotubes can be adopted as highly efficient catalyst for *** catalyst demonstrates impressive performance in ionic liquid(IL)-based electrolyte with a remarkable high Faradaic efficiency of 89%and NH3 yield rate of 425μg·h^(−1)·mg_(cat).^(−1),being close to the best-reported ***,the obtained performance metrics are significantly larger than those for N_(2) reduction *** also shows good durability with negligible activity decay even after 10 *** simulations reveal that the introduction of P dopants tunes the electronic structure of Ti active sites,thereby enhancing the NO adsorption and facilitating the desorption of ^(*)NH_(3).Moreover,the utilization of IL further suppresses the competitive hydrogen evolution *** study highlights the advantage of the catalyst−electrolyte engineering strategy for producing NH_(3) at a high efficiency and rate.

关键词： nitric oxide reduction reaction electrcatalysis ammonia production phosphorus-doped titania

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Effect of Y-filling on thermoelectric properties of CoSb_3

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Journal of Rare Earths 2011年第6期29卷 596-598页

作者：刘洪权高洪利谷亦杰赵新兵 College of Materials Science and Engineering Shandong University of Science and Technology State key laboratory of Silicon Materials Department of Materials Science Zhejiang University

The CoSb3 and Y0.18Co4Sb12 compounds were synthesized by a metallurgical route. Their bulk materials were prepared by the hot-pressed process under vacuum. Thermoelectric properties of the samples were measured by the thermoelectric measurement system and the laser flash diffusivity apparatus. The carrier type conversion of hot-pressed CoSb3 was found at about 530 K, while the conversion was missed for the Y0.18Co4Sb12 sample. Electrical conductivity of the Y0.18Co4Sb12 sample increased due to the increase of carrier concentration, and its thermal conductivity decreased due to the enhancement of phonon scattering. The value of ZT, figure of merit, for the Y0.18Co4Sb12 sample was obviously enhanced due to positive contribution of the electrical conductivity and the thermal conductivity.

关键词： thermoelectric material skutterudites electrical properties thermal conductivity rare earths

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Thylakoid Transit Peptide Is Related to the Expression and Localization of NdhB Subunits in Soybean

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Phyton-International Journal of Experimental Botany 2021年第1期90卷 99-110页

作者： Siyi Fu Tao Yun Dexuan Ma Bingsong Zheng Dean Jiang Yi He State key laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou311300China China Science and technology Exchange Center Beijing100045China State key laboratory of Plant Physiology and Biochemistry College of Life SciencesZhejiang UniversityHangzhou310058China

The chloroplast NAD(P)H dehydrogenase(NDH)complex,as one of the most important photosynthesis protein complexes in thylakoid membrane,is involved in photosystem I(PSI)cyclic electron transport(CEF).Under abiotic environmental stress,the photosynthetic apparatus is susceptible to the damage caused by the strong light ***,the enhancement of NDHdependent CEF could facilitate the alleviation of the damage to the photosynthetic *** NdhB subunit encoded by chloroplast genome is one of most important subunits of NDH complex and consists of 510 amino ***,according to cloning ndhB from Melrose(cultivated soybean),ACC547(wild salt-tolerant soybean),S113-6 and S111-9(hybrid descendant),based on the comparison and analysis of the sequences of NdhB subunits,we found that there is a novel thylakoid transit peptide of NdhB subunit in *** addition,crosslink immunoprecipitation,immunogold labeling and co-expression of GFP fusion protein indicated that the novel thylakoid transit peptide is favorable to the expression and localization of NdhB subunit in ***,we suggest that this novel thylakoid transit peptide plays the same role as chaperonin and contributes to facilitating the expression and localization of NdhB subunit.

关键词： NDH complex NdhB subunit thylakoid transit peptide

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