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Journal of Iron and Steel Research(International) 2024年第5期31卷 1127-1138页

作者： Hao Li hong-mei chen Xu Zhang Qian-hao Zang Jing Zhang Di Feng Yan-xin Qiao Yu-hang Guo School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212100JiangsuChina School of Metallurgy and Materials Engineering Jiangsu University of Science and TechnologySuzhou215600JiangsuChina

The solidification methods of electromagnetic stirring(EMS)and non-electromagnetic stirring were employed to prepare Mg–6Gd–3Y–xZn–0.6Zr(x=1,1.5,2,3)*** evolution of alloy microstructures and the changes in properties were analyzed for different Zn *** has been observed that in alloys without electromagnetic stirring,as the Zn content increases,the alloy structure gradually *** primary second phase transitions from Mg5RE phase to long-period stacking ordered(LPSO)phase,resulting in improved hardness and *** alloys subjected to electromagnetic stirring,there is a relatively higher content of the second phase,primarily consisting of LPSO *** applying electromagnetic stirring,the quantity and the type of LPSO phase in the alloy *** alloy structure becomes more uniform with electromagnetic stirring,resulting in increased hardness and reduced hardness gradients within the *** mechanical properties of alloys with electromagnetic stirring are superior to those without electromagnetic stirring.

关键词： Rare earth magnesium alloy LPSO phase Electromagnetic stirring Casting Property

Approximate Customized Proximal Point Algorithms for Separable Convex Optimization

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Journal of the Operations Research Society of China 2023年第2期11卷 383-408页

作者： hong-mei chen Xing-Ju Cai Ling-Ling Xu School of Mathematical Sciences Nanjing Normal UniversityNanjing 210023JiangsuChina Jiangsu Key Laboratory for NSLSCS Nanjing Normal UniversityNanjing 210023JiangsuChina

Proximal point algorithm(PPA)is a useful algorithm framework and has good convergence *** difficulty is that the subproblems usually only have iterative *** this paper,we propose an inexact customized PPA framework for twoblock separable convex optimization problem with linear *** design two types of inexact error criteria for the *** first one is absolutely summable error criterion,under which both subproblems can be solved *** one of the two subproblems is easily solved,we propose another novel error criterion which is easier to implement,namely relative error *** relative error criterion only involves one parameter,which is more *** establish the global convergence and sub-linear convergence rate in ergodic sense for the proposed *** numerical experiments on LASSO regression problems and total variation-based image denoising problem illustrate that our new algorithms outperform the corresponding exact algorithms.

关键词： Inexact criteria Proximal point algorithm Alternating direction method of multipliers Separable convex programming

Investigation of contemporary college students’mental health status and construction of a risk prediction model

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世界精神病学杂志 2023年第8期13卷 573-582页

作者： Xiao-Li Mao hong-mei chen School of Health and Nursing Wuchang University of TechnologyWuhan 430223Hubei ProvinceChina

BACKGROUND Due to academic pressure,social relations,and the change of adapting to independent life,college students are under high levels of ***,it is very important to study the mental health problems of college *** a predictive model that can detect early warning signals of college students’mental health risks can help support early intervention and improve overall *** To investigate college students’present psychological well-being,identify the contributing factors to its decline,and construct a predictive nomogram *** We analyzed the psychological health status of 40874 university students in selected universities in Hubei Province,China from March 1 to 15,2022,using online questionnaires and random *** influencing their mental health were also analyzed using the logistic regression approach,and R4.2.3 software was employed to develop a nomogram model for risk *** We randomly selected 918 valid data and found that 11.3%of college students had psychological *** results of the general data survey showed that the mental health problems of doctoral students were more prominent than those of junior college students,and the mental health of students from rural areas was more likely to be abnormal than that of urban *** addition,students who had experienced significant life events and divorced parents were more likely to have an abnormal *** abnormal group exhibited significantly higher Patient Health Questionnaire-9(PHQ-9)and Generalized Anxiety Disorder-7 scores than the healthy group,with these differences being statistically significant(P<0.05).The nomogram prediction model drawn by multivariate analysis includ-ed six predictors:The place of origin,whether they were single children,whether there were significant life events,parents’marital status,regular exercise,intimate friends,and the PHQ-9 *** training set demonstrated an area under the receiver operat

关键词： College Predictive models Psychological health Risk factors Logistic regression analysis Influencing factors

Effect of extrusion temperature on microstructure and tensile properties of Mg-Gd-Er-Zn-Zr alloy containing LPSO phase

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Journal of Iron and Steel Research(International) 2023年第8期30卷 1633-1641页

作者： Si-shu Wang Qian-hao Zang hong-mei chen Yu-hang Guo Feng-jian Shi Di Feng School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Foshan(Southern China)Institute for New Materials Foshan 528247GuangdongChina

The Mg-1Gd-0.75Er-0.5Zn-0.18Zr(at.%)alloy with long-period stacking ordered(LPSO)phase was prepared by metal mold casting and hot *** extruded samples had a typical bimodal *** different fractions of equiaxed grains were observed in annealed *** percentage of fine grains decreased in the extruded Mg alloys with and without annealing treatment when the extrusion temperature was *** LPSO phases promote recrystal-lization behavior in the samples through particle-stimulated nucleation(PSN)*** Mg alloys extruded at 300℃ with or without annealing treatment obtained the best tensile *** the low extrusion temperature,more finely equiaxed grains with random texture are formed through PSN,and more LPSO phase kink bands are formed,which could improve the mechanical properties of the extruded Mg alloys.

关键词： Mg alloy LPSO phase Recrystallization Texture Tensile property

Prediction of lymph node metastasis in early gastric signet-ring cell carcinoma:A real-world retrospective cohort study

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World Journal of Gastroenterology 2023年第24期29卷 3807-3824页

作者： Jia-Jia Yang Xiao-Yong Wang Rui Ma mei-hong chen Guo-Xin Zhang Xuan Li Department of Gastroenterology The First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029Jiangsu ProvinceChina Department of Gastroenterology The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical UniversityChangzhou 213000Jiangsu ProvinceChina Department of Nursing Jiangsu Health Vocational CollegeNanjing 211800Jiangsu ProvinceChina

BACKGROUND Signet-ring cell carcinoma(SRCC)was previously thought to have a worse prognosis than other differentiated gastric cancer(GC),however,recent studies have shown that the prognosis of SRCC is related to pathological *** hypothesize that patients with SRCC and with different SRCC pathological components have different probability of lymph node metastasis(LNM).AIM To establish models to predict LNM in early GC(EGC),including early gastric *** Clinical data from EGC patients who had undergone gastrectomy at the First Affiliated Hospital of Nanjing Medical University from January 2012 to March 2022 were *** patients were divided into three groups based on type:Pure SRCC,mixed SRCC,and non-signet ring cell carcinoma(NSRC).The risk factors were identified through statistical tests using SPSS 23.0,R,and EmpowerStats *** A total of 1922 subjects with EGC were enrolled in this study,and included 249 SRCC patients and 1673 NSRC patients,while 278 of the patients(14.46%)presented with *** analysis showed that gender,tumor size,depth of invasion,lymphovascular invasion,ulceration,and histological subtype were independent risk factors for LNM in *** and analysis using prediction models of EGC showed that the artificial neural network model was better than the logistic regression model in terms of sensitivity and accuracy(98.0%vs 58.1%,P=0.034;88.4%vs 86.8%,P2 cm(OR=5.422,P=0.038).CONCLUSION A validated prediction model was developed to recognize the risk of LNM in EGC a

关键词： Early gastric cancer Signet-ring cell carcinoma Lymph node metastasis Nomogram Prediction model

Evaluation of the effects of health education interventions for hypertensive patients based on the health belief model

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World Journal of Clinical Cases 2024年第15期12卷 2578-2585页

作者： hong-mei Wang Ying chen Yan-Hua Shen Xiao-mei Wang Department of Emergency Lishui Second People's HospitalLishui 323000Zhejiang ProvinceChina Department of Pancreatic and Biliary Surgery The First Affiliated Hospital of China Medical UniversityShenyang 110002Liaoning ProvinceChina

BACKGROUND Hypertension is a major risk factor for cardiovascular disease and stroke,and its prevalence is increasing *** education interventions based on the health belief model(HBM)can improve the knowledge,attitudes,and behaviors of patients with hypertension and help them control their blood *** To evaluate the effects of health education interventions based on the HBM in patients with hypertension in *** Between 2021 and 2023,140 patients with hypertension were randomly assigned to either the intervention or control *** intervention group received health education based on the HBM,including lectures,brochures,videos,and counseling sessions,whereas the control group received routine *** were measured at baseline,three months,and six months after the intervention and included blood pressure,medication adherence,self-efficacy,and perceived benefits,barriers,susceptibility,and *** The intervention group had significantly lower systolic blood pressure[mean difference(MD):-8.2 mmHg,P<0.001]and diastolic blood pressure(MD:-5.1 mmHg,P=0.002)compared to the control group at six *** intervention group also had higher medication adherence(MD:1.8,P<0.001),self-efficacy(MD:12.4,P<0.001),perceived benefits(MD:3.2,P<0.001),lower perceived barriers(MD:-2.6,P=0.001),higher perceived susceptibility(MD:2.8,P=0.002),and higher perceived severity(MD:3.1,P<0.001)than the control group at six *** Health education interventions based on the HBM effectively improve blood pressure control and health beliefs in patients with hypertension and should be implemented in clinical practice and community settings.

关键词： Hypertension Health education Health belief model Blood pressure control Randomized controlled trial

Effect of Sc on Al_(3)Fe phase and mechanical properties of as-cast AA5052 aluminum alloy

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China Foundry 2024年第3期21卷 257-264页

作者： Yang Li Qing Yu Feng-feng chen Jia-wen He hong-mei Yang Meng-nie Li Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

The AA5052 aluminum alloy is widely used in automobile and aerospace manufacturing,and with the development of light-weight alloys,it is required that these materials exhibit better mechanical *** studies have demonstrated that the addition of Sc to aluminum alloys can improve both the microstructure and properties of the *** this study,the effect of Sc on the Fe-rich phase and properties of the AA5052 aluminum alloy was studied by adding 0%,0.05%,0.2%,and 0.3%*** results show that with the increase of Sc,the coarse needle-like Fe-rich phase gradually transforms into Chinese-script and then nearly spherical particles,reduce the size of Fe-rich phase,and refine the grain with increase of high angle grain boundaries(HAGBs).These microstructure changes enhance the strength of the AA5052 alloy through Sc *** ductility of the alloy is obviously improved because the addition of a lower amount of Sc changes the morphology of Fe-rich phase from needle-like into a Chinese-script,and it is subsequently reduced as a result of significant increase in HAGBs with increasing Sc content.

关键词： AA5052 aluminum alloy Al3Fe phase mechanical properties grain boundary

Recent Progress in Shape Memory Polymers for Biomedical Applications

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Chinese Journal of Polymer Science 2018年第8期36卷 905-917页

作者： hong-mei chen Lin Wang Shao-Bing Zhou College of Chemistry and Materials Science Sichuan Normal University Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong University

Shape memory polymers （SMPs） as one type of the most important smart materials have attracted increasing attention due to their promising application in the field of biomedicine, textiles, aerospace et al. Following a brief intoduction of the conception and classification of SMPs, this review is focused on the progress of shape memory polymers for biomedical applications. The progress includes the early researches based on thermo-induced SMPs, the improvement of the stimulus, the development of shape recovery ways and the expansion of the applications in biomedical field. In addition, future perspectives of SMPs in the field of biomedicine are also discussed.

关键词： Shape memory polymers Biomedicical application Biodegradable

Risk Constrained Self-scheduling of AA-CAES Facilities in Electricity and Heat Markets:A Distributionally Robust Optimization Approach

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1159-1167页

作者： Zhiao Li Laijun chen Wei Wei Shengwei mei Department of Electrical Engineering Tsinghua UniversityBeijing 100084China New Energy(Photovoltaic)Industry Research Center Qinghai UniversityXining 810016China IEEE

Advanced adiabatic compressed air energy storage(AA-CAES)has the advantages of large capacity,long service time,combined heat and power generation(CHP),and does not consume fossil fuels,making it a promising storage technology in a low-carbon *** appropriate self-scheduling model can guarantee AA-CAES’s profit and attract ***,very few studies refer to the cogeneration ability of AA-CAES,which enables the possibility to trade in the electricity and heat markets at the same *** this paper,we propose a multimarket self-scheduling model to make full use of heat produced in *** volatile market price is modeled by a set of inexact distributions based on historical data through-***,the self-scheduling model is cast as a robust risk constrained program by introducing Stackelberg game theory,and equivalently reformulated as a mixed-integer linear program(MILP).The numerical simulation results validate the proposed method and demonstrate that participating in multienergy markets increases overall *** impact of uncertainty parameters is also discussed in the sensibility analysis.

关键词： Advanced adiabatic compressed air energy storage(AA-CAES) conditional value at risk(CVaR) distributionally robust optimization(DRO) heat market self-scheduling Stackelberg game

Mixed H_(∞)/Passive Exponential Synchronization for Delayed Memristive Neural Networks with Switching Event-Triggered Control

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Journal of Systems Science & Complexity 2024年第1期37卷 294-317页

作者： WU Wenhuang GUO Lulu chen hong Shanghai Research Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 200092China Department of Control Science and Engineering Tongji UniversityShanghai 201804China

This paper is devoted to event-triggered synchronization of delayed memristive neural networks with H∞and passivity *** aim is to guarantee the exponential synchronization and mixed H∞and passivity control for memristive neural networks by using event-triggered ***,a switching system is constructed under the event-triggered control ***,by adopting a piece-wise Lyapunov functional,a sufficient condition is established for the exponential synchronization and mixed H_(∞)and passivity ***,an event-triggered controller design scheme is proposed using matrix decoupling ***,the effectiveness of the designed controller is exemplified by a numerical example.

关键词： Event-triggered control exponential synchronization memristive neural networks time delays.