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Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure

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Chinese Journal of Chemical Engineering 2021年第4期34卷 87-99页

作者： Sheng Fang Yanding Wei Lei fu Geng tian Haibin Qu The State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China

The negative pressure conical fluidized bed is widely used in the pharmaceutical *** this study,experiments based on the negative pressure conical fluidized bed are carried out by changing the material mass and particle *** pressure fluctuation signals are analyzed by the time and the frequency domain methods.A method for absolutely characterizing the degree of the energy concentration at the main frequency is proposed,where the calculation is to divide the original power spectrum by the average signal power.A phenomenon where the gas velocity curve temporarily stops growing is observed when the material mass is light,and the particle size is *** standard deviation and kurtosis both rapidly change at the minimum fluidization velocity and thus can be used to determine the flow regime,and the variation rule of the kurtosis is independent of both the material mass and particle *** the initial fluidization stage,the dominant pressure signal comes from the material movement;with the increase in the gas velocity,the power of a 2.5 Hz signal continues to increase.A method of dividing the main frequency by the average cycle frequency can conveniently determine the fluidized state,and a novel concept called stable fluidized zone proposed in this paper can be *** the gas velocity within the stable fluidized zone ensures that the fluidized bed consistently remains in a stable fluidized state.

关键词： Conical fluidized bed Negative pressure Pressure fluctuation Time-series analysis Characteristic value Fluidized state

Y_(2)O_(3)-functionalized graphene-immobilized Ni–Pt nanoparticles for enhanced hydrous hydrazine and hydrazine borane dehydrogenation

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Rare Metals 2023年第10期42卷 3410-3419页

作者： Qi-Lu Yao Meng He Ya-Ru Kong tian gui Zhang-Hui Lu State-Province Joint Engineering Laboratory of Zeolite Membrane Materials Institute of Advanced Materials(IAM)Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationKey Laboratory of Energy Catalysis and Conversion of NanchangJiangxi Normal UniversityNanchang330022China

Developing efficient and highly selective catalyst to promote hydrogen generation from hydrous hydrazine(N_(2)H_(4)·H_(2)O) and hydrazine borane(N_(2)H_(4)BH_(3))remains a challenging issue for fuel cell-based hydrogen *** this work,ultrafine and well-dispersed bimetallic NiPt nanoparticles(3.4 nm) were successfully immobilized on Y_(2)O_(3)-functionalized graphene(Y_(2)O_(3)/rGO) without any surfactant by a simple liquid impregnation *** is firstly found that integration of graphene and Y_(2)O_(3) not only can facilitate the formation of ultrafine NiPt nanoparticles(NPs),but also can effectively modulate the electronic structure of NiPt NPs,thereby boosting the catalytic *** with NiPt/Y_(2)O_(3) and NiPt/rGO,the NiPt/Y_(2)O_(3)/rGO nanocomposites(NCs) show remarkable enhanced catalytic efficiency for hydrogen production from N_(2)H_(4)-H_(2)*** particular,the optimized Ni_(0.6)Pt_(0.4/)Y_(2)O_(3)/rGO NCs display the best catalytic efficiency and 100% H_(2) selectivity for N_(2)H_(4)-H_(2)O dehydrogenation,providing a turnover frequency(TOF) of2182 h^(-1) at 323 K,which is among the highest values ever ***,the Ni_(0.6)Pt_(0.4)/Y_(2)O_(3)/rGO NCs also exhibit an excellent catalytic performance(TOF=3191 h^(-1)) and 100% H_(2) selectively for N_(2)H_(4)BH_(3)dehydrogenation at 323 *** outstanding catalytic results obtained provide more possibilities for the potential applications of N_(2)H_(4)·H_(2)O and N_(2)H_(4)BH_(3) as promising chemical hydrogen storage materials.

关键词： Hydrous hydrazine(N_(2)H_(4)·H_(2)O) Hydrazine borane(N_(2)H_(4)BH_(3)) Dehydrogenation Graphene Catalysis

Spatial Pattern of Female Non-agricultural Employment and Its Driving Forces in Guangdong Province,China:A Perspective of Individual and Family-level

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Chinese Geographical Science 2020年第4期30卷 725-735页

作者： fu Zhanhui MEI Lin LIU Yanjun tian Junfeng ZHENG Rumin tian Jing School of Geography Science Northeast Normal UniversityChangchun 130024China School of Earth Science Jilin UniversityChangchun 130061China School of Tourism Management Zhengzhou UniversityZhengzhou 450001

Promoting women’s employment is not only the need of social and economic development,but also the historical mission of liberating *** paper uses data from the 1%Population Sample Survey,taken in Guangdong Province in 2015,to explore how women’s marital status,education,and family environment affect the female non-agricultural employment rate(FNAER)on a county scale using a spatial-lag *** results show that:1)The female non-agricultural employment rate in counties of Guangdong Province is low,with more than three-quarters of counties having female non-agricultural employment rate less than 50%.Moreover,the spatial distribution of FNAER is uneven,with the high-value areas concentrated in the southeast and the low-value areas mainly distributed in the central and western parts of Guangdong Province.2)From the perspective of industry,there are significant spatial differences among *** the southeast,women are mainly engaged in the secondary industry,while in the central and western regions,women are mainly engaged in the tertiary industry.3)Women having better skills and more effective support from the elderly can improve the *** having lower skills,smaller-scale families,a higher fertility rate,and households with two or more elderly members have a negative effect on the FNAER.4)Public policies suggest that improving women’s education and their family environment,building social welfare facilities,and repairing the family environment will increase the FNAER.

关键词： female non-agricultural employment(FNAER) spatial distribution driving factors family environment individual characteristics Guangdong Province China

A novel structure of quasi-monolayered NiCo-bimetal-phosphide for superior electrochemical performance

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Journal of Energy Chemistry 2022年第11期31卷 203-211,I0007页

作者： Long Zhao Ming Wen Yakun tian Qingsheng Wu Yongqing fu School of Chemical Science and Engineering Shanghai Key Laboratory of Chemical Assessment and SustainabilityState Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon TyneNE18STUnited Kingdom

Bimetallic transition metal phosphides(TMPs)as potential candidates for superior electrochemical performance are still facing great challenges in the controllable preparation of two-dimensional(2 D)structures with high aspect ***,a novel structure of quasi-monolayered NiCo-bimetal-phosphide(NiCoP)has been designed and successfully synthesized by the newly developed process combined with ultrasonic-cavitation and *** is the first time to break through the controllable preparation of 2 D bimetal-phosphides with a thickness of 0.98 nm in *** on the advantages of 2 D quasi-monolayer structure with dense crystalline-amorphous interface and the reconfigured electronic structure between Ni^(δ+)/Co^(δ+)and P^(δ-),the optimized Ni_(5%)CoP exhibits an outstanding bifunctional performance for electrocatalyzing both hydrogen evolution reaction and oxygen evolution reaction in an alkaline ***_(5%)CoP presents lower overpotentials and voltage of 84 mV&259 mV and1.48 V at the current density of 10 mA cm^(-2)for HER&DER and overall water splitting,respectively,which are superior to most other reported 2 D *** work provides a new strategy to optimize the performance of electrolytic water for bimetal-phosphates and it may be of significant value in extending the design of other ultrathin 2 D structured catalysts.

关键词： 2D quasi-monolayer Hydrogen evolution reaction Bimetal phosphide Oxygen evolution reaction Ultrasonic-cavitation

A first-principles study on electronic structures and elastic properties of metal dopedα-Fe(N)high nitrogen steel

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Journal of Iron and Steel Research International 2017年第1期24卷 103-110页

作者： Ji-chun Yang Xiang-jun Liu gui-xiao Jia Xiao-yang fu School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina

The binding energies,electronic structures and elastic properties of Ti,V,Cr,Mn,Co,Ni and Mg dopedα-Fe（N）systems have been investigated using a first-principles *** calculated results show that the dopings of Ti,V,Cr and Co improve the stability ofα-Fe（N）,and the stability ofα-Fe（N）is slightly weakened by Mn and Ni,and the doping of Mg is *** Ti,V,Cr and Mn dopedα-Fe（N）systems in which the doping metals are on the left side of Fe in the element periodic table andα-Fe（N）systems doped by Co and Ni on the right side of Fe,their corresponding cohesive forces decrease with decreasing atomic radius of the doping *** obvious interaction exists among M3 d,Fe4s3p3d and N2 *** these doping systems,metal atoms lose electrons,while N gains *** of Ti,V,Cr and Mn inα-Fe（N）strengthen the interaction between N and the surrounding metals,and it is not apparent for the dopings of Co,Ni and *** calculations of Fe15 MN systems show that,except for the Fe15 MgN system,shear modulus G and Young modulus E of Fe15 MN systems are improved,and the bulk modulus Bslightly decreases,namely,total elastic properties are *** magnitude change rule of E reflecting the cohesive force between atoms is consistent with that for the binding energies.

关键词： First principle High nitrogen steel Metal nitride Electronic structure Elastic property

CaCO_(3)-MnSiO_(x)hybrid particles to enable CO_(2)-mediated combinational tumor therapy

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Nano Research 2022年第9期15卷 8281-8290页

作者： Congkun Xie tian Zhang Yike fu Gaorong Han Xiang Li State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhouZhejiang 310027China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311200China

Nanocatalysts mediated reactive oxygen species(ROS)based therapy has been exploited as an alternative therapeutic modality of tumor with high specificity and minimal side ***,the treatment outcome is limited by the efficiency of local catalytic ***,we report a novel type of core–shell hybrid nanoparticles(CaCO_(3)@MS),consisting of CaCO_(3)and MnSiO_(x),for synergistic tumor inhibition combining enhanced catalytic effect and calcium *** this system,MnSiO_(x)serves as catalysts with glutathione(GSH)responsive Mn^(2+)ions release ***_(3)nanoparticles play three important roles,including carbon dioxide(CO_(2))donor,pH modulator,and Ca^(2+)overload *** is found that the CaCO_(3)nanoparticles can induce CO_(2)production and pH increase in acidic tumor environment,both of which promote Mn^(2+)mediated ROS *** simultaneous release of Ca^(2+)ions from CaCO_(3)triggers calcium overload in tumor,which functions collaboratively with excessive ROS to induce cancer cell *** results demonstrate that after treatment with CaCO_(3)@MS,a remarkable tumor inhibition was achieved both in vitro and in vivo,while no clear toxic effect was *** study has therefore provided a feasible effective approach to improve catalytic therapeutic efficacy by an“exogenous CO_(2)delivery”strategy for combinational tumor therapy.

关键词： nanocatalytic therapy manganese silicate carbon dioxide(CO_(2)) Ca^(2+)overload pH modulation

Comparative study of HFACS and the 24Model accident causation models

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Petroleum Science 2017年第3期14卷 570-578页

作者： gui fu Jia-Lin Cao Lin Zhou Yuan-Chi Xiang School of Resources and Safety Engineering China University of Mining and Technology (Beijing) Beijing 100083 China

A comparative study is conducted to compare the theory and application effect of two accident causation models, the human factors analysis and classification system（HFACS） and the accident causation ＂2-4＂ model（24 Model）, as well as to provide a reference for safety researchers and accident investigators to select an appropriate accident analysis method. The two models are compared in terms of their theoretical foundations, cause classifications, accident analysis processes, application ranges, and accident prevention strategies. A coal and gas outburst accident is then analyzed using both models, and the application results are compared. This study shows that both the 24 Model and HFACS have strong theoretical foundations, and they can each be applied in various domains. In addition, the cause classification in HFACS is more practical, and its accident analysis process is more convenient. On the other hand, the 24 Model includes external factors, which makes the cause analysis more systematic and comprehensive. Moreover, the 24 Model puts forward more corresponding measures to prevent accidents.

关键词： HFACS Accident causation "2-4" model Comparative study Unsafe acts External causes Coaland gas outburst accident

Effect of V–Ti Addition on Microstructure Evolution and Mechanical Properties of Hot-Rolled Transformation-Induced Plasticity Steel

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Acta Metallurgica Sinica(English Letters) 2019年第3期32卷 352-360页

作者： Hai-Cun Yu Zhao-Zhen Cai gui-Qin fu Miao-Yong Zhu School of Metallurgy Northeastern University

In order to reveal the effect of V–Ti addition on the microstructure evolution and the mechanical properties of hot-rolled transformation-induced plasticity(TRIP) steel, two steels with 0.072 V–0.051 Ti steel(Bear-V–Ti steel) and 0.001 V–0.001 Ti steel(Free-V–Ti steel) were designed, respectively, and the comparison analyses were carried out by performing thermodynamic calculation and an experiment. With the thermodynamic calculation, the critical annealing temperature of a large fraction of retained austenite(～51%) obtained via solute enrichment was determined, and an optimized quenching at 650 °C and tempering at 200 °C adopted on the as-hot-rolled steel. The results show that the V–Ti TRIP steel displays more optimum mechanical stability during the tensile deformation, since the fraction and the mechanical stability of retained austenite are improved and the microstructure is also ultrarefined by V–Ti alloy precipitation. The yield strength of Bear-V–Ti steel increases from 650 to 800 MPa, and the ductility reaches 37%, showing that the comprehensive mechanical properties are greatly improved.

关键词： Medium manganese steel Microstructure evolution Mechanical properties V–Ti

Recent progress on multifunctional electromagnetic interference shielding polymer composites

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Journal of Materials Science & Technology 2023年第3期134卷 106-131页

作者： Ke tian Danrong Hu Quan Wei Qiang fu Hua Deng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Rehabilitation Medicine Center and Institute of Rehabilitation Medicine Key Laboratory of Rehabilitation Medicine in Sichuan ProvinceWest China HospitalSichuan UniversityChengdu 610041China

The explosive development of electronic devices and wireless communication technology gives rise to the issue of electromagnetic pollution,known as electromagnetic interference(EMI).The accumulation of undesirable electromagnetic radiation in space disturbs the normal function of unshielded electronic appliances and poses seriously threat to human ***,the development of EMI shielding materials have emerged to solve the grim *** the complex application contexts,EMI shielding materials have evolved from traditional single-function to multi-functions to meet the ever-increasing application requirements in recent few *** paper provides detailed insight into the current re-search status and future challenges in the advancement of polymer-based EMI shielding materials with various ***,the basic theory of EMI shielding,factors influencing results and the dominating characterization technologies for EMI shielding properties are ***,the comprehensive descriptions of the seven types of multifunctional EMI shields are provided with respect to their structures,fabrication methods and specific ***,the corresponding critical scientific and technical issues are *** on our comprehensive analysis,the main challenges in the development of multifunctional EMI shielding materials are *** review aims to provide some guidance and inspire more efforts toward functional EMI shielding material research to satisfy the growing requirements for next-generation electronic systems.

关键词： Polymer-based composites Electromagnetic interference shielding Multiple losses Multifunctionality