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Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1369-1378页

作者： Zhixiong Zhu Xingxu Jiang Gang Wei Xiaogang Fang Zhihong Zhong Kuijing Song Jian Han Zhengyi Jiang school of Materials science and engineering Hefei University of TechnologyHefei 230009China school of Materials science and engineering Tianjin University of TechnologyTianjin 300384China school of Mechanical engineering and Automation University of Science and Technology LiaoningAnshan 114051China

To enhance the stress corrosion cracking(SCC)resistance,Zn was utilized as an alloy element to add in the AA5083 aluminum *** effects of Zn content on the microstructures,mechanical properties and SCC resistance were systematically *** results demonstrate that in the studied range adding Zn can significantly improve the SCC resistance of the AA5083 *** is related to the relatively low amount of continuous β(Al3Mg2)phase along grain boundary and the formation of Zn-containing phase such as Al5Mg11Zn4 *** on the results,the optimal Zn content with respect to SCC resistance is approximately 0.50 wt.%.Further increasing Zn content results in coarse precipitates discontinuously distributed along grain boundaries.

关键词： AA5083 aluminum alloy Slow strain rate test Precipitation Stress corrosion cracking

Construction of high-performance magnetic sensor based on anisotropic magnetoresistance Ta/MgO/NiFe/MgO/Ta film

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Rare Metals 2021年第8期40卷 2026-2032页

作者： Yue-Dou Pan Ling-Ran Yu Lei Wang Tao Chen Xin-Ya Wei Rong-Gui Zhu Jian-Wei Li Chun Feng Guang-Hua Yu school of Automation and Electrical engineering University of Science and Technology BeijingBeijing100083China school of Materials science and engineering University of Science and Technology BeijingBeijing100083China school of Chemical engineering and technology Tianjin UniversityTianjin300072China

The anisotropic magnetoresistance film is an important core material for developing the magnetic ***,Ta(5)/Mg O(3)/Ni Fe(10)/Mg O(3)/Ta(3)multilayers(in nanometer)were prepared by magnetron sputtering and further applied to construct a sensor element by combining with the Wheatstone *** 1/f noise of the sensor element was greatly reduced by three orders of magnitude after annealing at 400℃for 7200 s,which was mainly due to the significant microstructural changes during the ***,when the sensor element was applied to detect the magnetic signal of a magnetic code disk with 512 N-S magnetic poles,the output voltage signal of the sensor displayed a large fluctuation of±0.05 *** order to reduce the voltage fluctuation,a magnetic sensor chip by using a parallelly arranged multipath Wheatstone bridges and auto-gain compensation structure was designed,and magnetic sensor elements and the high-performance computing drive module were *** output voltage fluctuation of the magnetic sensor was reduced by about 90%and approached to±0.005 *** findings provide an important basis for the practical application of Ni Fe-based magnetic sensing film materials.

关键词： Magnetic sensor Anisotropic magnetoresistance Permalloy Multi-channel spatially parallel Wheatstone bridge Auto-gain compensation

Design of BiOBr_(0.25)I_(0.75) for synergy photoreduction Cr(Ⅵ) and capture Cr(Ⅲ) over wide pH range

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Chinese Chemical Letters 2022年第6期33卷 3053-3060页

作者： Lixia Jia Xin Tan Yanfang Li Yizhong Zhang Shiqian Cao Wei Zhou Xiang Huang Lequan Liu Tao Yu school of Environmental science and engineering Tianjin UniversityTianjin 300350China school of Chemical engineering and technology Tianjin UniversityTianjin 300350China school of science Tianjin UniversityTianjin 300350China school of science Tibet UniversityLhasa 850000China school of Materials science and engineering Tianjin UniversityTianjin 300350China

Conversion of hexavalent chromium(Cr(Ⅵ))to trivalent chromium(Cr(Ⅲ))is an effective way to reduce its environmental risk,especially via photoreduction ***,over a wide range of pH values,it is still a great challenge to achieve a high removal rate,and the disposal of produced Cr(Ⅲ)should be *** this work,we implemented a high removal rate at 98%for Cr(Ⅵ)and total chromium(Cr(T))over a wide pH range(4–10)through the synergistic effect of adsorption,photoreduction and immobilization on the surface of Bi OBr_(0.25)I_(0.75).The substitution of bromine by iodine reduced the adsorption energy of Cr(Ⅵ)on Bi OBr_(0.25)I_(0.75),promoting the adsorption of Cr(Ⅵ).Meanwhile,the introduced iodine upshifted the conduction band(CB),enhancing the reduction ability for Cr(Ⅵ)to Cr(Ⅲ).The negative surface of Bi OBr_(0.25)I_(0.75)can capture Cr(Ⅲ),achieving a high removal rate for Cr(T).The p H-independent feature for Cr(Ⅵ)and Cr(Ⅲ)removal make Bi OBr_(0.25)I_(0.75)a potential material for chromium-containing wastewater *** work provides an effective strategy for removing chromium over a wide p H range.

关键词： Adsorption Photoreduction BiOBr_(0.25)I_(0.75) Chromium

Hot Deformation Behavior of ATI 718Plus Alloy with Different Microstructures

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Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1383-1396页

作者： Chang Liu Jianbo Zhang Yikai Yang Xingchuan Xia Tian He Jian Ding Ying Tang Zan Zhang Xueguang Chen Yongchang Liu school of Material science and engineering Hebei University of TechnologyTianjin 300130China College of Physics and Electronic engineering Xingtai UniversityXingtai 054001China school of science Hebei University of TechnologyTianjin 300130.China school of Material science and engineering Tianjin UniversityTianjin 300130China

In this work, the eff ect of microstructure on hot deformation behavior of ATI 718Plus(hereinafter refers to 718Plus) alloy was studied by isothermal compression test. The results showed that when the strain rate was 0.01–0.1s^(-1) with deformation temperature of 980 and 1030℃, hot deformation behavior was mainly aff ected by dislocation density. Dislocation density of the air-cooling alloy was larger than that of the furnace-cooling alloy, which makes its critical strain smaller and peak stress higher than that of the furnace-cooling alloy. When the strain rate was 1 s^(-1), hot deformation behavior of the alloy was mainly aff ected by twins and γ ′ phase, and high-density deformation twins in air-cooling alloys resulted in higher critical strain. γ ′ phase exists in furnace-cooling alloy, which makes its peak stress higher than that of air-cooling alloy. 718Plus alloy is sensitive to cooling rate;dislocation and γ ′ phase have obvious eff ects on its hot deformation behavior.

关键词： 718Plus alloy Hot deformation Peak stress Dynamic recrystallization Critical strain

Hopf bifurcation and uncontrolled stochastic trafficinduced chaos in an RED-AQM congestion control system

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Chinese Physics B 2011年第9期20卷 92-97页

作者：王俊松袁睿翕高志伟王德进 school of Biomedical engineering Tianjin Medical University school of Information science Tsinghua University Department of Automation Tianjin University Department of Automation Tianjin University of Science and Technology

We study the Hopf bifurcation and the chaos phenomena in a random early detection-based active queue man- agement （RED-AQM） congestion control system with a communication delay. We prove that there is a critical value of the communication delay for the stability of the RED-AQM control system. Furthermore, we show that the system will lose its stability and Hopf bifurcations will occur when the delay exceeds the critical value. When the delay is close to its critical value, we demonstrate that typical chaos patterns may be induced by the uncontrolled stochastic traffic in the RED-AQM control system even if the system is still stable, which reveals a new route to the chaos besides the bifurcation in the network congestion control system. Numerical simulations are given to illustrate the theoretical results.

关键词： stability Hopf bifurcation chaos stochastic tramc

Catalytic ozonation of volatile organic compounds(ethyl acetate)at normal temperature

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Chinese Journal of Chemical engineering 2021年第4期34卷 159-167页

作者： Jiahao Cui Shejiang Liu Hua Xue Xianqin Wang Ziquan Hao Rui Liu Wei Shang Dan Zhao Hui Ding school of Environmental science and engineering Tianjin UniversityTianjin 300072China school of Chemical engineering and technology Tianjin UniversityTianjin 300072China tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin 300072China

Catalytic treatments of VOCs at normal temperature can greatly reduce the cost and temperature of processing,and improve the safety factor in line with the requirements of green *** carbon fiber(ACF)was pretreated with 10%H_(2)SO_(4)by single factor optimization to increase specific surface area and pore volume *** catalytic ozonation performance of ACF loaded with Au,Ag,Pt and Pd noble metals on ethyl acetate was investigated and Pd/ACF was selected as the optimal catalyst which had certain *** is uniformly distributed on the surface of ACF,and Palladium mainly exists in the form of Pd0 with a amount of Pd+*** specific surface area of the catalysts gradually decreases as the loading *** activation energy of ethyl acetate calculated by Arrhenius equation is 113 kJ mol *** 1%Pd loading and the concentration ratio of ozone to ethyl acetate is 3:1,catalytic ozonation performance is maximized and the conversion rate of ethyl acetate reached to 60%in 3050℃Cat 15,00030,000 h^1.

关键词： Catalytic ozonation Normal temperature Activated carbon fiber Ethyl acetate Noble metal catalysts

Turbulent mass transfer model for simulating protein desorption in liquid-solid circulating fluidized bed risers

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Particuology 2021年第4期19卷 167-175页

作者： Panfeng Ren Yawen Zhang Wenbin Li Kuotsung Yu Collaborative Innovation Center of Chemical science and engineering(tianjin) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China State Key Laboratory of Chemical engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

An integrated model,namely the two-equation turbulent model,is introduced to simulate mass transfer in a liquid-solid circulating fluidized bed(LSCFB)*** desorption is simulated and the proposed model is *** protein concentration profiles simulated with this model agree well with published experimental *** model enables direct determination of turbulent mass diffusivity,removing the need to empirically guess a constant turbulent Schmidt number for simulating mass transfer in a turbulent *** model is useful when the turbulent mass diffusivity is not available for simulating mass transfer in an LSCFB riser.

关键词： Liquid-solid circulating fluidized bed Simulation Turbulent mass diffusivity Ion exchange Protein recovery

Silk nanofibril as nanobinder for preparing COF nanosheet-based proton exchange membrane

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Green Energy & Environment 2023年第3期8卷 915-926页

作者： Ping Li Ningxin Zhang Xuan Li Shaokun Tang school of Chemical engineering&technology Tianjin UniversityTianjinChina Collaborative Innovation Center of Chemical science and engineering(tianjin) Tianjin UniversityTianjinChina

Two-dimensional covalent organic framework nanosheets(CONs)with ultrathin thickness and porous crystalline nature show substantial potential as novel membrane ***,bringing CONs materials into flexible membrane form is a monumental challenge due to the limitation of weak interactions among ***,one-dimensional silk nanofibrils(SNFs)from silkworm cocoon are designed as the nanobinder to link sulfonated CON(SCON)into robust SCON-based membrane through vacuum-filtration *** and large lateral-sized SCONs are synthesized via bottom-up interface-confined synthesis *** from high length-diameter ratio of SNF and rich functional groups in both SNF and SCON,two-dimensional(2D)SCONs are effectively connected together by physical entanglement and strong H-bond *** resultant SCON/SNF membrane displays dense structure,high mechanical integrity and good ***,the rigid porous nanochannels of SCON,high-concentration-SO3H groups insides the pores and H-bonds at SCON-SNF interfaces impart SCON/SNF membrane high-rate proton transfer ***,a superior proton conductivity of 365 mS cm^(-1)is achieved at 80C and 100%RH by SCON/SNF *** work offers a promising approach for connecting 2D CON materials into flexible membrane as high-performance solid electrolyte for hydrogen fuel cell and may be applied in membrane-related other fields.

关键词： Covalent organic framework nanosheet Silk nanofibril Membrane Proton conductivity Fuel cell

Three-dimensional boron nitride network/polyvinyl alcohol composite hydrogel with solid-liquid interpenetrating heat conduction network for thermal management

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Journal of Materials science & technology 2022年第32期127卷 183-191页

作者： Mengmeng Qin Yajie Huo Guoying Han Junwei Yue Xueying Zhou Yiyu Feng Wei Feng school of Materials science and engineering Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining technology Ministry of EducationTianjin 300072China school of Materials science and engineering Tianjin University of TechnologyTianjin 300084China

Polyvinyl alcohol hydrogels have been used in wearable devices due to their good flexibility and ***,due to the low thermal conductivity(κ)of pure hydrogel,its further application in high power devices is *** solve this problem,melamine sponge(MS)was used as the skeleton to wrap boron nitride nanosheets(BNNS)through repeated layering assembly,successfully preparing a three-dimensional(3D)boron nitride network(BNNS@MS),and PVA hydrogels were formed in the pores of the *** to the existence of the continuous phonon conduction network,the BNNS@MS/PVA exhibited an improvedκ.When the content of BNNS is about 6 wt.%,κof the hydrogel was increased to 1.12 W m^(-1)K^(-1),about two times higher than that of pure *** solid heat conduction network and liquid convection network cooperate to achieve good thermal management *** with its high specific heat capacity,the composites have an important application prospect in the field of wearable flexible electronic thermal management.

关键词： Thermal conductivity Polyvinyl alcohol Three-dimensional network Composite hydrogel

Shape-dependence in seeded-growth of Pd-Cu solid solution from Pd nanostructure towards methanol oxidation electrocatalyst

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Nano Research 2023年第7期16卷 9116-9124页

作者： Lianxi Si Hui Li Yu Zhang Donghao Zhang Xiaowei An Mengmeng Yao Yuanyuan Shao Jesse Zhu Shi Hu school of Chemical engineering and technology Tianjin UniversityTianjin 300072China Department of Chemistry School of ScienceTianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072China College of Environmental science and engineering Taiyuan University of TechnologyTaiyuan 030024China

Ultrathin Pd nanosheets(NSs)have great advantages in catalysis due to their large specific surface area and high percentage of under-coordinated ***,the electrochemical performance still can be improved via composition-controllable growth of their solid ***,seeded alloying strategy was proposed to synthesize Pd-Cu solid solution from Pd NSs and Pd-Cu nanostructures with tunable molar ratios obtained by changing the amount of Cu *** compared to the pristine Pd NSs,the Pd-Cu solid solution shows significantly enhanced methanol oxidation reaction(MOR)performance over those of Pd NSs and homemade Pd/C as the incorporation of Cu weakens the adsorption of CO intermediate on Pd in the MOR *** choice of template is pivotal to the growth,as a shape-dependent behavior could be identified in the alloying of Cu with Pd nanosheets enclosed by{111}and{100}facets,Pd nanocubes enclosed by{100}facet,and Pd nano-tetrahedrons enclosed by{111}*** Pd-Cu solid solution with tunable composition can only be obtained from Pd NSs and the shape-dependent alloying process is mainly determined by the diffusion barrier and the minimum diffusion depth of the different facets.

关键词： Pd-Cu alloy nanosheets tunable composition methanol oxidation reaction optimized electronic structure weakened COadsorption