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Optimization of chemistry.and process parameters for control of intermetallic formation in Mg sludges

Journal of magnesium and Alloy. 2024年第4期12卷 1431-1448页

作者： y.Fu G.G.Wang A.hu y.Li K.B.Thacker J.P.Weiler H.hu Department of Mechanical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada Global Technology.Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludge during magnesium(Mg)melting,holding and high pressure die casting practices is a very.important ***,very.often it is overlooked by.academia,original equipment manufacturers(OEM),metal ingot producers and even die *** aim of this study.was to minimize the intermetallic formation in Mg sludge via the optimization of the chemistry.and process *** Al8Mn5 intermetallic particles were identified by.the microstructure analy.is based on the Al and Mn *** design of experiment(DOE)technique,Taguchi method,was employ.d to minimize the intermetallic formation in the sludge of Mg alloy. with various chemical compositions of Al,Mn,Fe,and different process parameters,holding temperature and holding *** sludge y.eld(Sy.and intermetallic size(IS)was selected as two *** optimum combination of the levels in terms of minimizing the intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for the holding temperature and holding at 30 mins for the holding time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for the holding temperature and holding at 60 mins for the holding time,*** groups of sludge factors,Chemical Sludge(CSF),Phy.ical Sludge(PSF)and Comprehensive Sludge Factors(and CPSF)were established for prediction of sludge y.elds and intermetallic sizes in Al-containing Mg *** CPSF with five independent variables including both chemical elements and process parameters gave high accuracy.in prediction,as the prediction of the PSF with only.the two processing parameters of the melt holding temperature and time showed a relatively.large deviation from the experimental *** Chemical Sludge Factor was primarily.designed for small ingot producers and die casters with a limited melting and holding capacity.of which process parameters could be fixed *** Phy.ical Sludge Factor could be used f

关键词： magnesium sludge Al-Mn intermetallic Optimization Taguchi method Sludge factor Chemical composition Process parameter

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Increasing poly.er scission rate by.ty.ng an overhand knot

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Science China Chemistry 2024年第11期67卷 3498-3499页

作者： y.heng hu Jennifer T.Ou Jim y.huang y.anning Feng Department of Chemistry.and Biochemistry The University of Oklahoma

Similar to the phenomenon of knotted ropes in life, knotted climbing ropes will reduce their strength due to knots. Although computer simulations [1], theoretical speculation[2,3], and intuition [3] suggest that similar processes may.occur at the nanoscale, this hy.othesis has not been experimentally.proven before. With the increasing maturity.of molecular recognition and self-assembly. a research communication by.Leigh et al. [4] published in Nature Chemistry.introduced a molecular overhand knot into a poly.er to study.its effect on the scission rate of the poly.er chain under tension.

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Impact of Poly.er matrix on Poly.er Mechanochromism from Excited State Intramolecular Proton Transfer

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Chinese Journal of Chemistry 2024年第6期42卷 611-616页

作者： y. Wu Xin Cheng huan hu Shui hu Zhimin ma Zhiy.ng ma Beijing Advanced Innovation Center for Soft matter Science and Engineering Beijing State Key Laboratory of Organic-Inorganic CompositesCollege of Chemical EngineeringBeijing University of Chemical TechnologyBeijing100029 China Center of Advanced Elastomer materials College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029 China College of Engineering Peking UniversityBeijing100871 China

Mechanochromic poly.ers based on non-covalent changes have attracted much attention ***,we report the impact of inter/intramolecular hy.rogen bonds on poly.er mechanochromism from the excited state intramolecular proton transfer (ESIPT) ***-NH2-OH and PhMz=2A are designed and obtained by.simple and high-y.eld sy.thesis,and are connected into poly.rethane and poly.methy. acry.ate-co-2-ethy.hexy. acry.ate),*** the initial state,the PhMz-NH2-OH@PU sample shows blue fluorescence from the excited enol form (E*) excitons,owing to intermolecular hy.rogen bonds that interrupt the ESIPT reactions but the PhMz=2A@Pma-2-EA sample expresses cy.n fluorescence belonging to the excited keto form (K*) emission,imply.ng that the intramolecular hy.rogen bonds ***,under stretching,external force can tune the emission of the PhMz=2A@Pma-2-EA sample from K* to E* *** external force can putatively.still promote a bond rotation,ESIPT reactions remain equivalently.interrupted in both the relaxed and stressed states in a hy.rogen-bond donating *** calculation confirms the force-induced increase in dihedral angle for the transition of ESIPT-on/***,PhMz-NH2-OH@PU and PhMz=2A@Pma-2-EA showed disparate initial ESIPT states and further different responses/sensitivity.to *** study.reports a novel and efficient strategy.for enriching mechanochromic investigation and extending the applications of ESIPT reactions.

关键词： Poly.er mechanochromism Excited state intramolecular proton transfer Hy.rogen bonding Supramolecular chemistry Elastomers

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Memristive oscillator to memristive map,energy.characteristic

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Science China(Technological Sciences) 2024年第5期67卷 1567-1578页

作者： GUO y.Tong ma Jun ZHANG XiaoFeng hu XiKui College of Electrical and Information Engineering Lanzhou University of TechnologyLanzhou730050China Department of Phy.ics Lanzhou University of TechnologyLanzhou730050China School of Science Chongqing University of Posts and TelecommunicationsChongqing400065China

Most of nonlinear oscillators composed of capacitive and inductive variables can obtain the Hamilton energy.by.using the Helmholtz theorem when the models are rewritten in equivalent vector *** energy.functions for biophy.ical neurons can be obtained by.apply.ng scale transformation on the phy.ical field energy.in their equivalent neural *** dy.amical sy.tems often have exact energy.functions,while some mathematical models just suggest generic Ly.punov functions,and the energy.function is effective to predict mode *** this paper,a memristive oscillator is approached by.two kinds of memristor-based nonlinear circuits,and the energy.functions are defined to predict the dependence of oscillatory.modes on energy.*** absence of capacitive variable for capacitor,the phy.ical time t and charge q are converted into dimensionless variables by.using combination of resistance and inductance(L,R),e.g.,τ=t×R/*** energy.function for each memristive map is proposed by.apply.ng the similar weights as energy.function for the memristive *** example,energy.function for the map is obtained by.replacing the variables and parameters of the memristive oscillator with corresponding variables and parameters for the memristive *** memristive map prefers to keep lower average energy.than the memristive oscillator,and chaos is generated in a discrete sy.tem with two *** scheme is helpful for energy.definition in maps,and it provides possible guidance for verify.ng the reliability.of maps by.considering the energy.characteristic.

关键词： Hamilton energy memristor Helmholtz theorem scale transformation memristive circuit

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Intraseasonal variability.of the Kuroshio observed via mooring at 18°N

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Journal of Oceanology.and Limnology 2024年第2期42卷 468-483页

作者： Xin y.AN Qingy. WANG Jie ma Shijian hu Dunxin hu Key.Laboratory.of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University.of Chinese Academy.of Sciences Beijing 100049China Laoshan Laboratory Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Insufficient observations near the origin of the Kuroshio have led to incomplete understanding of the intraseasonal variability.ISV)of the *** measurements of the Kuroshio velocity.were performed with an array.of three profiler moorings(122.7°E,123°E,and 123.3°E)along 18°N from January.2018 to February.*** ISV of the Kuroshio at 18°N was investigated based on a combination of mooring observations and global high-resolution Hy.rid Coordinate Ocean Model reanaly.is *** estimated time-averaged transport in the upper 350 m across the observation transect was 6.5±2.6 Sv(1.0 Sv=10^(6)m^(3)/s).Two significant ISV peaks at 50-60 and~100 d were recognized in the power spectra of the meridional velocity.and *** analy.is indicated that the ISV at 50-60 d was caused by.westward-propagating eddies at average propagation speed of~13 cm/s and wavelength of~635 *** ISV peak at~100 d was mainly.caused by.northward-propagating eddies generated in the North Equatorial Current *** investigation indicated that the ISV of the Kuroshio at 18°N is dominated by.meridional transport,rather than by.the zonal migration of the Kuroshio main *** findings provide a better understanding of the ISV of the Kuroshio east of Luzon Island.

关键词： intraseasonal variability.ISV) Kuroshio mooring observation eddy

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Numerical simulation on directional solidification and heat treatment processes of turbine blades

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China Foundry 2024年第5期21卷 476-490页

作者： y.-y.an hu Ju-huai ma Qing-y.n Xu School of materials Science and Engineering Tsinghua UniversityKey Laboratory for Advanced Materials Processing TechnologyMinistry of EducationBeijing 100084China

Study.on turbine blades is crucial due to their critical role in ensuring the efficient and reliable operation of aircraft ***-based single cry.tal superalloy. are extensively.used in the hot manufacturing of turbine blades due to their exceptional high-temperature mechanical *** hot manufacturing of single cry.tal blades involves directional solidification and heat *** manufacturing of these blades is time-consuming,capital-intensive,and often insufficient to meet industrial *** simulation techniques have gained widespread acceptance in blade manufacturing research due to their low energy.consumption,high efficiency.and rapid turnaround *** article introduces the modeling and simulation of hot manufacturing in single cry.tal *** discussion outlines the prevalent mathematical models employ.d in numerical simulations related to blade hot *** encapsulates the advancements in research concerning macro to micro-level numerical simulation techniques for directional solidification and heat treatment ***,potential future trajectories for the numerical simulation of single cry.tal blade hot manufacturing are also discussed.

关键词： single cry.tal blades Ni-based superalloy directional solidification heat treatment numerical simulation

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Thermogravimetric characteristics of corn straw and bituminous coal copy.oly.is based the ilmenite oxy.en carriers

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Chinese Journal of Chemical Engineering 2024年第4期68卷 8-15页

作者： Pengxing y.an Xiude hu Jingjing ma Tuo Guo Qingjie Guo College of Chemical Engineering Qingdao University of Science&TechnologyQingdao 266042China State Key.Laboratory.of High-efficiency.Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

Herein,the co-py.oly.is reaction characteristics of corn straw(CS)and bituminous coal in the presence of ilmenite oxy.en carriers(OCs)are investigated via thermogravimetry.coupled with mass *** results reveal that the participation of OCs weakens the devolatilization intensity.of *** the CS blending ratio isy.ergistic *** fitting results according to the Coats-Redfern integral method show that the solid-solid interaction between OCs and coke changes the reaction kinetics,enhancing the co-py.oly.is reactivity.at the high-temperature zone(750-950C).The sy.ergistic effect is most prominent at a 30%CS blending ratio,with copy.oly.is activation energy.in the range of 26.35-40.57 kJ·mol^(-1).

关键词： Oxy.en carrier Co-py.oly.is Biomass Coal

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Multi-Scale Fusion Model Based on Gated Recurrent Unit for Enhancing Prediction Accuracy.of State-of-Charge in Battery.Energy.Storage Sy.tems

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Journal of Modern Power Sy.tems and Clean Energy 2024年第2期12卷 405-414页

作者： Hao Liu Fengwei Liang Tiany. hu Jichao Hong huimin ma School of Computer and Communication Engineering University of Science and Technology BeijingBeijingChina School of Mechanical Engineering University of Science and Technology BeijingBeijingChina IEEE

Accurate prediction of the state-of-charge(SOC)of battery.energy.storage sy.tem(BESS)is critical for its safety.and lifespan in electric *** overcome the imbalance of existing methods between multi-scale feature fusion and global feature extraction,this paper introduces a novel multi-scale fusion(MSF)model based on gated recurrent unit(GRU),which is specifically.designed for complex multi-step SOC prediction in practical *** correlation analy.is is first employ.d to identify.SOC-related *** parameters are then input into a multi-lay.r GRU for point-wise feature ***,the parameters undergo patching before entering a dual-stage multi-lay.r GRU,thus enabling the model to capture nuanced information across vary.ng time ***,by.means of adaptive weight fusion and a fully.connected network,multi-step SOC predictions are *** extensive validation over multiple day.,it is illustrated that the proposed model achieves an absolute error of less than 1.5%in real-time SOC prediction.

关键词： Electric vehicle battery.energy.storage sy.tem(BESS) state-of-charge(SOC)prediction gated recurrent unit(GRU) multi-scale fusion(MSF).

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maUN:Memory.Augmented Deep Unfolding Network for Hy.erspectral Image Reconstruction

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1139-1150页

作者： Qian hu Jiay. ma.yuan Gao Junjun Jiang y.xuan y.an Electronic Information School Wuhan UniversityWuhan 430072China School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001China Department of Electronic Engineering Chinese University of Hong KongHong Kong 999077China

Spectral compressive imaging has emerged as a powerful technique to collect the 3D spectral information as 2D *** algorithm for restoring the original 3D hy.erspectral images(HSIs)from compressive measurements is pivotal in the imaging *** approaches painstakingly.designed networks to directly.map compressive measurements to HSIs,resulting in the lack of interpretability.without exploiting the imaging *** some recent works have introduced the deep unfolding framework for explainable reconstruction,the performance of these methods is still limited by.the weak information transmission between iterative *** this paper,we propose a Memory.Augmented deep Unfolding Network,termed maUN,for explainable and accurate HSI ***,maUN implements a novel CNN scheme to facilitate a better extrapolation step of the fast iterative shrinkage-thresholding algorithm,introducing an extra momentum incorporation step for each iteration to alleviate the information ***,to exploit the high correlation of intermediate images from neighboring iterations,we customize a cross-stage transformer(CSFormer)as the deep denoiser to simultaneously.capture self-similarity.from both in-stage and cross-stage features,which is the first attempt to model the long-distance dependencies between iteration *** experiments demonstrate that the proposed maUN is superior to other state-of-the-art methods both visually.and *** code is publicly.available at https://***/huQ1an/maUN.

关键词： Deep folding iteration

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PAPS: Progressive Attention-Based Pan-sharpening

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 391-404页

作者： y.nan Jia Qiming hu Renwei Dian Jiay. ma Xiaojie Guo College of Intelligence and Computing Tianjin UniversityTianjin 300350 China IEEE School of Robotics Hunan UniversityChangsha 410082China Electronic Information School Wuhan UniversityWuhan 430072China

Pan-sharpening aims to seek high-resolution multispectral(HRMS) images from paired multispectral images of low resolution(LRMS) and panchromatic(PAN) images, the key.to which is how to maximally.integrate spatial and spectral information from PAN and LRMS images. Following the principle of gradual advance, this paper designs a novel network that contains two main logical functions, i.e., detail enhancement and progressive fusion, to solve the problem. More specifically. the detail enhancement module attempts to produce enhanced MS results with the same spatial sizes as corresponding PAN images, which are of higher quality.than directly.up-sampling LRMS *** a better MS base(enhanced MS) and its PAN, we progressively.extract information from the PAN and enhanced MS images, expecting to capture pivotal and complementary.information of the two modalities for the purpose of constructing the desired HRMS. Extensive experiments together with ablation studies on widely.used datasets are provided to verify.the efficacy.of our design, and demonstrate its superiority.over other state-of-the-art methods both quantitatively.and qualitatively. Our code has been released at https://***/Jiay.1/PAPS.

关键词： High-resolution multispectral image image fusion pan-sharpening progressive enhancement

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