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Impacts of near-M_(s)austempering treatment on microstructure evolution and bainitic transformation kinetics of a medium Mn steel

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Journal of Iron and Steel Research International 2025年第1期32卷 249-259页

作者： Yong-gang Yang Xin-yue Liu Rui-zhi Li yu-lai Chen Hong-xiang wu Guo-min Sun Zhen-li Mi National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China Technology Center Ningbo Iron&Steel Co.Ltd.Ningbo 315800ZhejiangChina

The microstructure evolution and bainitic transformation of an Fe-0.19C-4.03Mn-1.48Si steel subjected to near-M_(s)austempering treatment were systematically investigated by combining dilatometer,X-ray diffraction,and electron *** additional austempering treatments with isothermal temperatures above M_(s)were used as *** show that the incubation period for the bainitic transformation occurs when the medium Mn steel is treated with the austempering temperature above M_(s).However,when subjected to near-M_(s)isothermal treatment,the medium Mn steel does not show an incubation period and has the fastest bainitic transformation ***,the largest volume fraction of bainite with a value of 74.7%is obtained on the condition of near-M_(s)austempering treatment after cooling to room *** and microstructure evolution analysis indicates that the elimination of the incubation period and the fastest rate of bainitic transformation are related to the preformed *** advent of preformed martensite allows the specimen to generate more bainite in a limited *** bainitic ferrite nucleation at austenite grain boundaries and through autocatalysis at ferrite/austenite interfaces,a model is established to understand the kinetics of bainite formation and it can describe the nucleation rate of bainitic transformation well when compared to the experimental results.

关键词： Medium manganese steel Bainitic transformation Microstructure Near-M_(s)austempering Transformation modeling

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Effect of chronic intermittent hypoxia on theophylline metabolism in mouse liver

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Chinese Medical Journal 2013年第1期126卷 118-123页

作者： CHEN Xiao-yang ZENG Yi-ming ZHANG Yi-xiang WANG Wan-yu wu Run-hua Department of Pulmonary Medicine Second Clinical MedicalCollege of Fujian Medical University Quanzhou Fujian 362000China

Background Chronic intermittent hypoxia （CIH） has been associated with abnormalities in the liver, which is the most important organ for drug metabolism. This study aimed to investigate the effect of CIH on theophylline metabolism in mouse liver. Methods Eight C57BL/6J mice were exposed to CIH for 12 weeks. Eight C57BL/6J mice were exposed to room air as a control group. Serum levels of alanine aminotransferase and aspartate aminotransferase were measured. Liver histology was observed by light and electron microscopy. Total hepatic cytochrome P450 concentration was measured. Hepatocytes were isolated and incubated with 15 mg/ml theophylline for four hours. After incubation, the theophylline concentration in the supernatant was measured and the theophylline metabolism rate was calculated. Results CIH did not affect the serum transaminase levels. Livers from mice exposed to CIH showed hepatocellular edema, and liver cells had fuzzy rough endoplasmic reticulum under the electron microscope. The theophylline metabolism rate was significantly inhibited by CIH compared with controls; （16.60±2.43）% vs. （21.58±4.52）% （P=0.02）. The total liver cytochrome P450 concentration in the CIH group was significantly lower than in the control group; （0.83±0.08） vs. （1.13±0.21）mol/mg microsomal protein （P=0.004）. Conclusion CIH decreases theophylline metabolism by mouse hepatocytes, which may correlate with the downregulation of cytochrome P450 expression by CIH.

关键词： hypoxia liver metabolism sleep apnea syndrome theophylline

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Prediction of intrusive gas pores caused by resin burning in sand core for iron castings

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China Foundry 2025年第1期22卷 23-32页

作者： Ji-wu Wang Xiao-long Wang yu-cheng Sun yu-hang Huang Xiu-ming Chen Xiong-zhi wu Na Li Jin-wu Kang Tao Jing Tian-you Huang Hai-liang yu School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Weichai Power Co. Ltd.Weifang 261061ShandongChina School of Mechanical Engineering Central South UniversityChangsha 41000China School of Materials Science and Engineering Key Laboratory for Advanced Materials Processing TechnologyTsinghua UniversityBeijing 100084China

In the production of castings,intrusive gas pore represents a kind of common defects which can lead to leakage in high gas-tightness requirement castings,such as cylinder blocks and cylinder heads for *** occurs due to the intrusion of gases generated during the resin burning of the sand core into castings during the casting ***,a gas generation and flow constitution model was established,in which the gas generation rate is a function of temperature and time,and the flow of gas is controlled by the gas release,conservation,and Darcy's *** heat transfer and gas flow during casting process was numerically *** dangerous point of cores is firstly identified by a virtual heat transfer method based on the similarity between heat transfer and gas flow in the sand *** gas pores in castings are predicted by the gas pressure,the viscosity and state of the melt for these dangerous *** distinct sand core structures were designed and used for the production of iron castings,and the simulated gas pore results were validated by the obtained castings.

关键词： gas pore numerical simulation iron casting sand core resin

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Perilipin-2 mediates ferroptosis in oligodendrocyte progenitor cells and myelin injury after ischemic stroke

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Neural Regeneration Research 2025年第7期20卷 2015-2028页

作者： Jian Yang Jiang wu Xueshun Xie Pengfei Xia Jinxin Lu Jiale Liu Lei Bai xiang Li Zhengquan yu Haiying Li Department of Neurosurgery&Brain and Nerve Research Laboratory The First Affiliated Hospital of Soochow UniversitySuzhouJiangsu ProvinceChina Institute of Stroke Research Soochow UniversitySuzhouJiangsu ProvinceChina

Differentiation of oligodendrocyte progenitor cells into mature myelin-forming oligodendrocytes contributes to *** of remyelination due to oligodendrocyte progenitor cell death can result in severe nerve *** is an iron-dependent form of regulated cell death caused by membrane rupture induced by lipid peroxidation,and plays an important role in the pathological process of ischemic ***,there are few studies on oligodendrocyte progenitor cell *** analyzed transcriptome sequencing data from GEO databases and identified a role of ferroptosis in oligodendrocyte progenitor cell death and myelin injury after cerebral *** analysis suggested that perilipin-2(PLIN2)was involved in oligodendrocyte progenitor cell ***2 is a lipid storage protein and a marker of hypoxia-sensitive lipid droplet *** further investigation,we established a mouse model of cerebral ischemia/*** found significant myelin damage after cerebral ischemia,as well as oligodendrocyte progenitor cell death and increased lipid peroxidation levels around the infarct *** ferroptosis inhibitor,ferrostatin-1,rescued oligodendrocyte progenitor cell death and subsequent myelin *** also found increased PLIN2 levels in the peri-infarct area that co-localized with oligodendrocyte progenitor ***2 knockdown rescued demyelination and improved neurological *** findings suggest that targeting PLIN2 to regulate oligodendrocyte progenitor cell ferroptosis may be a potential therapeutic strategy for rescuing myelin damage after cerebral ischemia.

关键词： bioinformatics bulk RNA sequencing ferroptosis ischemic stroke myelin injury oligodendrocyte progenitor cell perilipin-2 single-cell RNA sequencing

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Assessment of internal exposure risk from metals pollution of occupational and non-occupational populations around a non-ferrous metal smelting plant

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Journal of Environmental Sciences 2025年第1期147卷 62-73页

作者： Yingjun wu Mengdie Qi Hang yu Guiying Li Taicheng An Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Key Laboratory for City Cluster Environmental Safety and Green DevelopmentSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China

Non-ferrous metal smelting poses significant risks to public ***,the copper smelting process releases arsenic,a semi-volatile metalloid,which poses an emerging exposure risk to both workers and nearby *** comprehensively understand the internal exposure risks of metal(loid)s from copper smelting,we explored eighteen metal(loid)s and arsenic metabolites in the urine of both occupational and non-occupational populations using inductively coupled plasma mass spectrometry with high-performance liquid chromatography and compared their health *** showed that zinc and copper(485.38 and 14.00μg/L),and arsenic,lead,cadmium,vanadium,tin and antimony(46.80,6.82,2.17,0.40,0.44 and 0.23μg/L,respectively)in workers(n=179)were significantly higher compared to controls(n=168),while Zinc,tin and antimony(412.10,0.51 and 0.15μg/L,respectively)of residents were significantly higher than ***,workers had a higher monomethyl arsenic percentage(MMA%),showing lower arsenic methylation *** appointment analysis identified arsenic,lead,cadmium,antimony,tin and thallium as co-exposure metal(loid)s from copper smelting,positively relating to the age of *** hazard index(HI)of workers exceeded 1.0,while residents and control were approximately at ***,all three populations had accumulated cancer risks exceeding 1.0×10^(-4),and arsenite(AsIII)was the main contributor to the variation of workers and ***,residents living closer to the smelting plant had higher health *** study reveals arsenic exposure metabolites and multiple metals as emerging contaminants for copper smelting exposure populations,providing valuable insights for pollution control in non-ferrous metal smelting.

关键词： Arsenic metabolites Metal(loid)s Non-ferrous metal smelting Human biomonitoring Exposure Urine

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Blood lead level in Chinese adults with and without coronary artery disease

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Journal of Geriatric Cardiology 2021年第11期18卷 857-866页

作者： Shi-Hong LI Hong-Ju ZHANG Xiao-Dong LI Jian CUI yu-Tong CHENG Qian WANG Su WANG Chayakrit Krittanawong Edward A El-Am Rody G.Bou Chaaya xiang-yu wu Wei GU Hong-Hong LIU Xian-Liang YAN Zhi-Zhong LI Shi-Wei YANG Tao SUN Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityBeijingChina Department of Echocardiography Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijingChina Department of Cardiology Shougang Changzhi Steel HospitalChangzhiChina Department of Cardiology Baylor College of MedicineHoustonUSA Department of Medicine Indiana University School of MedicineIndianapolisUSA

BACKGROUND The Trial to Assess Chelation Therapy study found that edetate disodium(disodium ethylenediaminetet-raacetic acid)chelation therapy significantly reduced the incidence of cardiac events in stable post-myocardial infarction patients,and a body of epidemiological data has shown that accumulation of biologically active metals,such as lead and cadmium,is an important risk factor for cardiovascular ***,limited studies have focused on the relationship between angiograph-ically diagnosed coronary artery disease(CAD)and lead *** study compared blood lead level(BLL)in Chinese pa-tients with and without *** In this prospective,observational study,450 consecutive patients admitted to Beijing Anzhen Hospital with sus-pected CAD from November 1,2018,to January 30,2019,were *** patients underwent coronary angiography,and an experienced heart team calculated the SYNTAX scores(SXscore)for all available coronary *** were determined with atomic absorption spectrophotometry and compared between patients with angiographically diagnosed CAD and those without *** In total,343(76%)patients had CAD,of whom 42%had low(0−22),22%had intermediate(23−32),and 36%had high(≥33)*** were 36.8±16.95μg/L in patients with CAD and 31.2±15.75μg/L in those without CAD(P=0.003).When BLLs were categorized into three groups(low,middle,high),CAD prevalence increased with increasing BLLs(P<0.05).In the multivariate regression model,BLLs were associated with CAD(odds ratio(OR):1.023,95%confidence interval(CI):1.008−1.039;P=0.0017).OR in the high versus low BLL group was 2.36(95%CI:1.29−4.42,P=0.003).Furthermore,BLLs were independently associated with intermediate and high SXscore(adjusted OR:1.050,95%CI:1.036-1.066;P<0.0001).CONCLUSION BLLs were significantly associated with angiographically diagnosed ***,BLLs showed excel-lent predictive value for SXscore,especially for complex coronary artery lesions.

关键词： coronary Blood admitted

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Nanostructured ZnO/BiVO_(4)I-scheme heterojunctions for piezocatalytic degradation of organic dyes via harvesting ultrasonic vibration energy

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 488-497页

作者： Yiling Li Xiaoyao yu Yingjie Zhou Yao Lin Ying wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

BiVO_(4)porous spheres modified by ZnO were designed and synthesized using a facile two-step *** resulting ZnO/BiVO_(4)composite catalysts have shown remarkable efficiency as piezoelectric catalysts for degrading Rhodamine B(RhB)unde mechanical vibrations,they exhibit superior activity compared to pure *** 40wt%ZnO/BiVO_(4)heterojunction composite displayed the highest activity,along with good stability and *** enhanced piezoelectric catalytic activity can be attributed to the form ation of an I-scheme heterojunction structure,which can effectively inhibit the electron-hole ***,hole(h+)and superoxide radical(·O_(2)^(-))are proved to be the primary active ***,ZnO/BiVO_(4)stands as an efficient and stable piezoelectric catalyst with broad potential application in the field of environmental water pollution treatment.

关键词： piezoelectric catalytic heterojunction dye degradation ultrasonic vibration

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Revisit the Gibbs-Thomson Equation Fitting of Poly(butylene succinate)Based on Oligomer Extended-Chain Crystals

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Chinese Journal of Polymer Science 2025年第2期43卷 392-398页

作者： Na Li yu-Pei Tian Tian-yu wu Qiong Zhou Hai-Mu Ye College of New Energy and Materials China University of PetroleumBejing 102249China

The equilibrium melting point(T_(m)^(0))is a crucial thermodynamic parameter for characterizing the crystallization and melting behavior of semi-crystalline ***,the direct measurement of T_(m)^(0) poses a significant challenge because of the difficulty in physically fabricating fully-extended chain crystals of high-molecular-weight ***,various extrapolation equations for T_(m)^(0) have been proposed that utilize the thermal properties of ordinary folded-chain *** these,the Gibbs-Thomson equation is one of the most commonly employed for *** its widespread use,there are notable variations in the T_(m)^(0) values obtained by different research groups,even when based on similar *** raises questions about the validity and accuracy of using the Gibbs-Thomson equation to linearly extrapolate T_(m)^(0).In this study,we prepared a series of oligomer extended-chain crystals(ECCs)of poly(butylene succinate)(PBS)and used their properties for Gibbs-Thomson *** results reveal a perfect linear relationship,with an extrapolated T_(m)^(0) value of 136.08℃.The basal surface free energy of the oligomer ECCs was calculated as 0.084 J/m^(2),which is approximately twice that of folded-chain *** difference is attributed to the aggregation of highly mobile free tails on the crystal *** two structural features of oligomer ECCs—large thickness and fixed surface—better fulfill the conditions for applying the Gibbs-Thomson equation,ensuring its validity and ***,we believe that the Gibbs-Thomson fit can produce reliable results when sufficient high-quality data are used.

关键词： Equilibrium melting point Extended-chain crystal Gibbs-Thomson equation Inclusion complex

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Potassium-modified carbon nitride photocatalyzed-aminoacylation of N–sulfonyl ketimines

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Chinese Chemical Letters 2025年第2期36卷 406-411页

作者： Cailing wu Shaojie wu Qifei Huang Kai Sun Xianqiang Huang Jianji Wang Bing yu Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of Education School of Chemistry and Chemical Engineering Henan Normal University College of Chemistry Zhengzhou University School of Chemistry & Chemical Engineering Liaocheng University

The development of innovative and sustainable catalytic strategies for organic synthesis is a pivotal aspect of advancing material science and chemical *** research presents a new catalytic method for the aminoacylation of N–sulfonyl ketimines by utilizing a potassium-doped graphite-like carbon nitride （g-C3N4） *** method not only enhances the catalytic efficiency and broadens the light absorption spectrum of g-C3N4but also significantly reduces the recombination rate of electronhole pairs,thereby increasing the reaction yield and ***,our approach facilitates the synthesis of aminoacylated N-heterocycles,expanding the applicability of potassium-modified g-C3N4in photocatalytic organic synthesis.A notable accomplishment of this study is the unprecedented generation of carbamoyl radicals via heterogeneous photocatalysis,which can be easily recycled after *** advancement highlights the capability of potassium-doped g-C3N4（namely K-CN） as an advanced heterogeneous photocatalyst for the formation of complex organic compounds.

关键词： Amides Aminoacylation K+-modified carbon nitride Oxamic acids Photocatalysis

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Efficient catalysis of FeNiCu-based multi-site alloys on magnesium-hydride for solid-state hydrogen storage

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Chinese Chemical Letters 2025年第1期36卷 603-609页

作者： Shuai Li Liuting Zhang Fuying wu Yiqun Jiang Xuebin yu School of Energy and Power Instrumental Analysis CenterJiangsu University of Science and TechnologyZhenjiang 212003China Department of Materials Science Fudan UniversityShanghai 200433China Max Planck Institute for Iron Research Düsseldorf 40237Germany

Hydrogen,as a cheap,clean,and cost-effective secondary energy source,performs an essential role in optimizing today’s energy *** hydride(Mg H_(2))represents an attractive hydrogen carrier for storage and transportation,however,the kinetic behavior and operating temperature remain *** this work,a dual-phase multi-site alloy(Ms A)anchored on carbon substrates was designed,and its superior catalytic effects on the hydrogen storage properties of MgH_(2) were *** analysis identified that multi-site Fe Ni_(3)/Ni Cu nanoalloys synergistically served as intrinsic drivers for the striking de/hydrogenation performance of the MgH_(2)-Ms A ***,the unique multi-metallic site structure attached to the surface of MgH_(2)provided substantial reversible channels and accessible active sites conducive to the adsorption,activation,and nucleation of H *** addition,the coupling system formed by FeNi_(3) and NiCu dual-phase alloys further enhanced the reactivity between Mg/MgH_(2) and H ***,the onset dehydrogenation temperature of Mg H_(2)+5 wt%Ms A was reduced to 195℃ and the hydrogen desorption apparent activation energy was reduced to 83.6 k J/mol.5.08 wt%H_(2) could be released at 250℃ in 20 min,reaching a high dehydrogenation rate of 0.254 wt%H_(2)/min,yet that for MgH_(2) at a higher temperature of 335℃ was only 0.145 wt%H_(2)/***,the dehydrogenated Mg H_(2)-Ms A sample could absorb hydrogen from room temperature(30℃)and charge 3.93 wt%H_(2) at 100℃ within20 min under 3.0 MPa H_(2) *** from carbon substrates,the 5 wt%Ms A doped-MgH_(2) could still maintain 6.36 wt%hydrogen capacity after 20 *** conclusion,this work provides experimental rationale and new insights for the design of efficient catalysts for magnesium-based solid-state hydrogen storage materials.

关键词： Hydrogen storage Magnesium hydride Synergistic effect Catalysis Multi-site alloys

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