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HKUST-1 derived one-dimensional Cu/N-doped carbon nanofibers for simultaneous detection of acetaminophen and sulfanilamide

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Progress in Natural Science:Materials International 2023年第6期33卷 825-832页

作者： Saisai Chen Chaohai Wang Dayong Xu Jiansheng Li School of Chemical and Environmental Engineering Anhui Polytechnic University Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology School of Municipal and Environmental Engineering Henan University of Urban Construction

The design of novel signal amplification elements was key to improving the sensing and analysis performance of electrochemical sensors. In this work, porous one-dimensional copper nitrogen-doped carbon nanofibers(CuNCNFs) were successfully prepared via the coupled process of electrospinning technology and high-temperature pyrolysis. This coupling of multiple processes and the introduction of heteroatoms pyrolyzed the HKUST-1 particles to generate three-dimensional Cu-doped carbon octahedra and mosaic them inside the one-dimensional carbon nitride channels, obtaining small-sized Cu particles while introducing a large number of N species, and constructing a three-dimensional MOFs-derived metal-carbon hybrid one-dimensional multistage carbon nitride structure. The resulting Cu-NCNFs sensor could simultaneously determine acetaminophen and sulfanilamide and exhibit superior electroanalytical performance, reproducibility, stability, and selectivity. This strategy provides a new approach to preparing novel signal amplification elements for the efficient monitoring of micropollutants.

关键词： HKUST-1 Cu/N-doped carbon nanofibers Acetaminophen Sulfanilamide

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Resistance law of a rod penetrating a multilayer granular raft

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Chinese Physics B 2023年第3期32卷 354-362页

作者：李宗霖田强胡海岩 MOE Key Laboratory of Dynamics and Control of Flight Vehicle School of Aerospace EngineeringBeijing Institute of TechnologyBeijing 100081China

This paper presents an experimental study on the resistance law of a rod vertically penetrating different kinds of multilayer granular rafts with a constant velocity so as to reveal the mechanical properties of the multilayer granular *** resistance was quasi-static under the chosen *** were conducted with different granular thicknesses,rod diameters and combinations of particles and *** study shows that the resistance–displacement relation of the rod has three smooth *** the first stage,the resistance rapidly *** the second stage,the resistance curve maintained an almost constant *** the third stage,the resistance smoothly changed with its slope continuously *** on the corresponding physical models for each stage,the study reveals the exponential dependence of the load-bearing capacity of the multilayer granular raft on its thickness,and clarifies the capillary effects on the resistance *** study extends the knowledge of the granular raft from monolayer to multilayer structure.

关键词： granular matter wet particles saturated particles capillary effects

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Comprehensive kinetic study on ammonia/ethylene counter-flow diffusion flames:influences of diluents

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International Journal of Coal Science & technology 2024年第1期11卷 232-249页

作者： Zhimei Shu Tingting Xu Jiayi Xiao Qige Deng Xuan Zhao Tianjiao Li Yaoyao Ying Dong Liu MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing210094China

This study aimed to investigate the effects of ammonia addition on ethylene counter-flow diffusion flames with different diluents on the fuel or oxidizer side,using kinetic analyses.A special emphasis was put on assessing the coupled chemical effects of NH_(3) and CO_(2) on C2H4 combustion *** chemical effects could be evaluated by comparing fictitious inert NH_(3) or CO_(2) with normal active NH_(3) or CO_(2).The results revealed that the addition of NH_(3) decreased the mole fractions and production rates of key soot precursors,such as acetylene,propynyl,and *** CO_(2) was used as the dilution gas,the coupled chemical effects of NH_(3) and CO_(2) were affected by the chemical effects of CO_(2) to varying *** the oxidizer-side CO_(2) addition,the coupled chemical effects of NH_(3) and CO_(2) reduced the mole fractions of H,O,OH radicals,acetylene,propynyl,and benzene,while the effects differed from the fuel-side CO_(2) *** coupled chemical effects of NH_(3) and CO_(2) also promoted the formation of aldehyde contaminants,such as acetaldehyde,to some extent,particularly with CO_(2) addition on the oxidizer side.

关键词： Ammonia addition Diluents Coupled chemical effects Kinetic analysis

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Fuel type recognition of ester isomer additives in flames by optical diagnostics coupled with machine learning method

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Science China(Technological Sciences) 2024年第11期67卷 3431-3442页

作者： HE JiaYing CHEN MengFei WU BingKun YING YaoYao YAN WeiJie LI TianJiao LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Based on machine learning models,an approach for the type recognition of oxygenated additives(ester isomers,i.e.,methyl butyrate,methyl crotonate,ethyl acrylate,and ethyl acrylate)via optical diagnostics was *** utilizing optical diagnostic methods flame features were extracted,and three models including random forest(RF),artificial neural network(ANN),and support vector machine(SVM),were employed to establish the relationship between flame images and oxygenated ***,the impact of multiple factors on model performance,including image compression,dataset size,and feature number was also *** images of flame obtained from inverse diffusion flame under four different oxygenated additives and various combustion conditions were used as examples to examine the effectiveness of the proposed *** indicated that the accuracy of the recognition of ester isomers by the proposed approach exceeded 90%.Furthermore,it is observed that image compression had minimal impact on prediction accuracy but significantly reduced processing *** types of features contributed to predicting the type of ester isomers variously,and all models exhibited improved accuracy with an increased number of *** number of samples significantly affected model *** investigation of feature missing and insufficient training samples suggested that ANN and RF models were more suitable for cases with many missing features,while SVM was more suitable for dealing with small samples.

关键词： fuel recognition machine learning feature extraction optical diagnostics ester isomers

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Effects of dimethyl ether and ethanol additions on soot transition in ethylene counterflow diffusion flames

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Science China(Technological Sciences) 2024年第4期67卷 1094-1112页

作者： GUO LinGe YING YaoYao CHEN Chen ZHAO Xuan LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

This paper investigates the effect of blending dimethyl ether(DME)and ethanol on the soot transition periods in ethylene counterflow diffusion flames by using a novel optical diagnostic *** soot critical transition point in different conditions is identified experimentally and *** kinds of flames are carried out to gain the soot critical transition point in counterflow diffusion flames by changing oxygen fraction(Xo)and changing volume flow rates of fuel and oxidizer(Qv).The red-green-blue(RGB)ratio method is used to precisely identify the soot critical transition point,and chemical kinetic simulations are performed to analyze the detailed reaction *** results show that compared to the ethylene flame,the soot critical transition point occurs at a higher Xoand a lower Qvwhen DME or ethanol is *** addition of DME and ethanol can inhibit soot formation,due to the degree of soot formation reaction being lower than the degree of the oxidation reaction in the blending flames.

关键词： optical diagnosis sooting tendency counterflow diffusion flame dimethyl ether ethanol

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Sensitivity analysis of modeling parameters to soot and PAHs prediction in ethylene inverse diffusion flame

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Science China(Technological Sciences) 2024年第2期67卷 486-498页

作者： WU BingKun LI TianJiao LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and Technology Nanjing 210094China

The soot formation model based on inverse ethylene diffusion flames was performed to study the sensitivity of the soot formation process to the prediction *** effects of efficiency parameters such as soot inception,surface growth and coagulation on the simulation results were studied by using the adjustable efficiency *** addition,the reversible soot model and conjugate heat transfer(CHT)model were also introduced to explore their *** indicated that,among adjustable efficiency parameters,the nucleation efficiency had the greatest influence on the predicted soot and PAHs distributions,while the Habstraction-C2H2-addition(HACA)process and PAH adsorption surface growth efficiencies impacted *** adjustable efficiency parameters had a significant effect on the concentration of soot gaseous precursors and soot particles,but their effects on temperature,gas phase molecules,and intermediate species were not *** the nucleation efficiency increased from 2×10^(-6)to 1×10^(-4),the predicted value of the integrated soot was increased by nearly 50%,and the maximum primary particle number density and the number of aggregates were increased by an order of *** maximum concentration of BAPYR was ***,the peak temperature along the axial direction increased by only 3.5 *** the reversible soot model,the approximation results of the adjustable efficiency parameters could be modified,which showed the feasibility of the *** use of the CHT model promoted pyrolysis of the fuel below the outlet of the fuel tube,with high-temperature zones,soot zones,and PAHs zones moving towards higher flame ***,when using the reversible model and the CHT model,the maximum soot volume fraction decreased by 39%compared with the basic efficiency parameters,while the concentration of BAPYR increased by 162%,and the concentrations of gas phase species were decreased.

关键词： inverse diffusion flames soot formation soot model ethylene

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Design and Application of Online Monitoring System for the Grab-type Ship Unloader Based on Multi-source Sensing 15

Design and Application of Online Monitoring System for the G...

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15th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Zhang, Panpan Li, Jing Shen, Chaoyu Li, Menghan Chen, Qingwei China Waterborne Transportation Institute Beijing China Transportation Industry Key Laboratory of Port Logistics Equipment and Control Engineering Beijing China

ISBN: (数字)9798350354010

ISBN: (纸本)9798350354010

The bridge-type grab ship unloader is one of the main ship unloading equipment at dry bulk cargo terminals. In recent years, with the continuous advancement of the construction of automated terminals, the operation mode of GSU has undergone tremendous changes, gradually shifting from operation by operators on large equipment to remote operation or automated operation. The traditional operation and maintenance of GSU is passive, and the main mode is planned maintenance. This method has problems such as poor timeliness and high cost, and is also not suitable for the development trend of automated terminals. Under such circumstances, strengthening the real-time monitoring of the operating status of GSU is particularly important. In response to the problems existing in traditional operations in this paper, the finite element modeling analysis of the mechanical structure of GSU was carried out, and combined with the daily operation and maintenance records, the main monitoring parts were determined. The overall architecture of the online monitoring system of GSU was designed, and the functional designs of the stress analysis subsystem, vibration analysis subsystem, fault diagnosis and real-time early warning subsystem of the online monitoring system of GSU were carried out, and it was applied on the port GSU. The design and application of the online monitoring system of GSU can promptly discover the potential safety hazards of the equipment and play a positive role in promoting the construction and development of automated terminals. © 2024 IEEE.

关键词： Construction equipment

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Characterization of vortex structures with self-excited oscillations based on Liutex-Omega vortex identification method

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Journal of Hydrodynamics 2023年第1期35卷 95-111页

作者： Dong-dong Wang Zhao-hui Wang Yi-wei Fan Xiao Sun Quan-jie Gao Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and TechnologyWuhan430081China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and TechnologyWuhan430081China

The self-excited oscillation effect produces a continuous periodic pulsation without an external excitation *** is widely used in fluid heat and mass transfer,cavitation and resistance reduction,and other related *** self-excited oscillation effect is significantly influenced by the vortex structure created by the jet passing through the specially designed *** flow field in a self-excited oscillation cavity is simulated in this paper using the large eddy simulation(LES)*** Liutex-Omega([Math Processing Error])method is used to analyze the vortex structure’s evolution inside the cavity and is contrasted with the Q-criterion,the λ_(2)-criterion,and the Omega(Ω)*** studies indicate that the[Math Processing Error]method is less sensitive to threshold selection compared with other methods,while it is more capable of identifying weak *** change in cavity vortex structure can be devided into the four stages of vortex ring priming,growth and development,wall touch separation,and *** turbulent energy generated by shear effect can promote the growth and development of the vortex ring structure and has an important influence on the formation of the vortex ring *** vortex strength reveals the interaction mechanism between the shear effect and vortex *** vortex core area illustrates that the small-scale vortices are mainly distributed inside the collision walls of the cavity and the downstream flow *** Liutex-omega method has unique advantages in analyzing the cavity flow field and revealing the mechanism of self-excited oscillations.

关键词： Vortex identification Liutex-Omega([Math Processing Error]) self-excited oscillation large eddy simulation(LES)

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Efficient NO_x abatement by passive adsorption over a Pd-SAPO-34 catalyst prepared by solid-state ion exchange

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Chinese Chemical Letters 2024年第4期35卷 210-213页

作者： Linhui Liu Wuwan Xiong Mingli Fu Junliang Wu Zhenguo Li Daiqi Ye Peirong Chen National Engineering Laboratory for VOCs Pollution Control Technology and Equipment Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution ControlSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China

Palladium-exchanged chabazite(Pd-CHA) zeolites as passive NO_x adsorbers(PNAs) enable efficient purification of nitrogen oxides(NO_x) in cold-start diesel exhausts. Their commercial application, however,is limited by the lack of facile preparation method. Here, high-performance CHA-type Pd-SAPO-34 zeolite was synthesized by a modified solid-state ion exchange(SSIE) method using PdO as Pd precursor,and demonstrated superior PNA performance as compared to Pd-SAPO-34 prepared by conventional wetchemistry strategies. Structural characterization using Raman spectroscopy and X-ray diffraction revealed that the SSIE method avoided water-induced damage to the zeolite framework during Pd loading. Mechanistic investigations on the SSIE process by in situ infrared spectroscopy and X-ray photoelectron spectroscopy disclosed that, while PdO precursor was mainly converted to Pd^(2+) cations coordinated to the zeolite framework by consuming the-OH groups of the zeolite, a portion of PdO could also undergo thermal decomposition to form highly dispersed Pd~0 clusters in the pore channels. This simplified and scalable SSIE method paves a new way for the cost-effective synthesis of defect-free high-performance Pd-SAPO-34 zeolites as PNA catalysts.

关键词： Pd-SAPO-34 Passive NO_x adsorber Pd loading Solid-state ion exchange Pd transformation

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Intermediate Temperature Fatigue Induced Precipitation and Associated Corrosion in CrMnFeCoNi High Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1857-1869页

作者： Tiezhuang Han Jing Wang Bo Li Shuang Li Kaisheng Ming Fucheng Wang Bin Miao Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin300401China

Understanding the corrosion behavior of high entropy alloys(HEAs)after intermediate temperature fatigue is critical to prevent their catastrophic failures from the reduction of corrosion ***,we investigated the corrosion behavior of CrMnFeCoNi HEA after 500℃ fatigue test with strain amplitudes of 0.2%and 0.5%.The intermediate temperature fatigue induced two types of precipitates,which were determined as Cr-richσphase and NiMn-rich L10 *** strain amplitude not only promoted precipitates generations but also spread the nucleation sites from intergranular to both intergranular and ***,we found that the deterioration in corrosion resistance of the alloy was derived from the increase of precipitates,which destroyed the stability of the passive *** above results revealed that intermediate temperature fatigue impaired the stabilization of the solid solution state and subsequent corrosion resistance of CrMnFeCoNi HEA,where the higher strain amplitude led to more precipitates and more severe corrosion.

关键词： High entropy alloy Corrosion Intermediate temperature fatigue Phase stability Precipitate

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