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Fracture mechanism of inclusions in thick plate center under tensile loading

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Journal of Iron and Steel Research International 2024年第5期31卷 1196-1209页

作者： Lei hu Li-qin Zhang feng hu Guo-hong Zhang Kuan Zheng Collaborative Innovation Center for Advanced Steels Wuhan University of Science and TechnologyWuhan430081HubeiChina Department of Applied Physics Wuhan University of Science and TechnologyWuhan430081HubeiChina Analysis and Testing Center Wuhan University of Science and TechnologyWuhan430081HubeiChina

Segregation of solute atoms in the center of thick plates of the tempered steel can cause an inhomogeneous structural transformation and generate micron-sized inclusions,which leads to lamellar tearing of thick plate and decreases the plasticity and *** formation and fragmentation mechanisms of micron-sized inclusions,like MnS and(Nb,Ti)C,in the center of thick plates were investigated by using thermodynamic calculations,finite element simulations,and electron backscatter diffraction characterization *** results show that micron-sized inclusions nucleate and grow in the liquid phase,and under tensile loading,they exhibit three fragmentation *** local stress during the fragmentation of inclusions is lower than the critical fracture stress of adjacent grains,and phase boundaries can effectively impede crack propagation into the *** existence of a low proportion of high-angle grain boundaries(58.1%)and high Kernel average misorientation value(0.534°)in the segregation band promotes inclusions fragmentation and crack *** difference in crack initiation and propagation direction caused by the morphology of inclusions and physical properties,as well as different matrix arrest abilities,is the main reasons for the diversity of inclusion fragmentation.

关键词： Thick plate Inclusion Finite element simulation Critical fracture stress Fracture mechanism

A CNN-SVR model for NO_(2)profile prediction based on MAX-DOAS observations:The influence of Chinese New Year overlapping the 2020 COVID-19 lockdown on vertical distributions of tropospheric NO_(2)in Nanjing,China

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Journal of Environmental Sciences 2024年第7期141卷 151-165页

作者： Xin Tian Zijie Wang Pinhua Xie Jin Xu Ang Li Yifeng Pan feng hu Zhaokun hu Mingsheng Chen Jiangyi Zheng Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Key laboratory of Environmental Optical and Technology Anhui Institute of optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China

In this study,a hybrid model,the convolutional neural network-support vector regression model,was adopted to achieve prediction of the NO_(2)profile in Nanjing from January 2019to March *** the sudden decline in NO_(2)in February 2020,the contribution of the Coronavirus Disease-19(COVID-19)lockdown,Chinese New Year(CNY),and meteorologi cal conditions to the reduction of NO_(2)was ***_(2)vertical column densities(VCDs) from January to March 2020 decreased by 59.05%and 32.81%,relative to the same period in 2019 and 2021,*** the period of 2020 COVID-19,the average NO_(2)VCDs were 50.50%and 29.96%lower than those during the pre-lockdown and post-lockdown pe riods,*** NO_(2)volume mixing ratios(VMRs)during the 2020 COVID-19 lock down significantly decreased below 400 *** NO_(2)VMRs under the different wind fields were significantly lower during the lockdown period than during the pre-lockdown period This phenomenon could be attributed to the 2020 COVID-19 *** NO_(2)VMRs be fore and after the CNY were significantly lower in 2020 than in 2019 and 2021 in the same period,which further proves that the decrease in NO_(2)in February 2020 was attributed to the COVID-19 *** source analysis of an NO_(2)pollution episode during the lockdown period showed that the polluted air mass in the Beijing-Tianjin-Hebei was trans ported southwards under the action of the north wind,and the subsequent unfavorable meteorological conditions(local wind speed of<2.0 m/sec)resulted in the accumulation o pollutants.

关键词： MAX-DOAS CNN-SVR Nitrogen dioxide COVID-19 Chinese New Year Regional transport

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A Low Cost, Green Sustainable and Biodegradable Biomass-based Fluorine-free Water and Oil Repellent

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Chinese Journal of Polymer Science 2024年第4期42卷 480-491页

作者： Zhi-Wei Shen Shu-feng hu Chen Zeng Wei-Qing Kong Mei-Fang Zhu State Key Laboratory for Modification of Chemical Fibers&Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510630China

With the global ban on plastics intensifying, the substitution of plastic with paper has garnered increasing attention. However, the inadequate water and oil repellency of pulp molding hinders its practical applications. Currently, the common method to enhance the oil and water repellency of pulp molding is by adding fluorinated water and oil repellents. Nevertheless, fluorinated compounds are environmentally and physiologically harmful. Therefore, the development of fluorine-free, water and oil repellent alternatives is crucial. In this study, chitosan and stearic acid were utilized as the first and second layers of the oil and water repellent coatings, respectively. The coated samples exhibited favorable water repellency, with a water contact angle of 116.4°, and excellent oil repellency, achieving a 12/12 rating on the kit scale. Importantly, the samples did not exhibit any leakage after being soaked in hot water and hot oil at 95±5℃ for 30 min, demonstrating remarkable performance as a barrier against hot water and oil. Moreover, the coated samples displayed outstanding mechanical properties, thermal stability, biodegradability, and recyclability. The approach presented in this study is simple, cost-effective, environmentally friendly, and represents a promising technique for producing fluoride-free, oil-and water-resistant pulp molding products.

关键词： Biomass Fluoride-free Oil-andwater-resistant Plasticfree

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Leveraging Uncertainty for Depth-Aware Hierarchical Text Classification

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Computers, Materials & Continua 2024年第9期80卷 4111-4127页

作者： Zixuan Wu Ye Wang Lifeng Shen feng hu Hong Yu Chongqing Key Laboratory of Computational Intelligence Chongqing University of Posts and TelecommunicationsChongqing400000China Division of Emerging Interdisciplinary Areas Hong Kong University of Science and TechnologyHong Kong999077China

Hierarchical Text Classification(HTC)aims to match text to hierarchical *** methods overlook two critical issues:first,some texts cannot be fully matched to leaf node labels and need to be classified to the correct parent node instead of treating leaf nodes as the final classification ***,error propagation occurs when a misclassification at a parent node propagates down the hierarchy,ultimately leading to inaccurate predictions at the leaf *** address these limitations,we propose an uncertainty-guided HTC depth-aware model called ***,we design an early stopping strategy with uncertainty to identify incomplete matching between text and labels,classifying them into the corresponding parent node *** approach allows us to dynamically determine the classification depth by leveraging evidence to quantify and accumulate *** results show that the proposed DepthMatch outperforms recent strong baselines on four commonly used public datasets:WOS(Web of Science),RCV1-V2(Reuters Corpus Volume I),AAPD(Arxiv Academic Paper Dataset),and ***,on the BGC dataset,it improvesMicro-F1 andMacro-F1 scores by at least 1.09%and 1.74%,respectively.

关键词： Hierarchical text classification incomplete text-label matching uncertainty depth-aware early stopping strategy

High-temperature stability of retained austenite and plastic deformation mechanism of ultra-fine bainitic steel isothermally treated below Ms

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Journal of Iron and Steel Research International 2024年第8期31卷 2014-2030页

作者： Ting-ting He feng hu Kun Wang Wen Zhou Li Li Serhii Yershov Kai-ming Wu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Collaborative Innovation Center for Advanced Steels Wuhan University of Science and TechnologyWuhan 430081HubeiChina Zhejiang Tsingshan Iron and Steel Co. Ltd.Qingtian 323903ZhejiangChina

The mechanical properties of the sample and the stability of retained austenite were studied by designing two kinds of ultra-fine bainitic steel with different heat treatment methods austempering above and below Ms(martensite start tem-perature),which were subjected to tensile tests at 20 and 450℃,*** results show that compared to room temperature(20℃)tensile properties,the uniform elongation of the sample at high temperature(450℃)significantly ***,the uniform elongation of the sample austempered above Ms decreased from 8.0%to 3.5%,and the sample austempered below Ms decreased from 10.9%to 3.1%.Additionally,the tensile strength of the sample austempered above Ms significantly decreased(from 1281 to 912 MPa),and the sample austempered below Ms slightly decreased(from 1010 to 974 MPa).This was due to the high carbon content(1.60 wt.%),high mechanical stability,low thermal stability for the retained austenite of the sample austempered below ***,the retained austenite decomposed at high temper-atures,the carbon content and transformation driving force were significantly reduced,the transformation rate increased,and the phase transformation content reduced.

关键词： Ultra-fine bainite Isothermal treatment High-temperature tensile property Retained austenite stability Plastic deformation

Influence of self-similar stresses on scenario earthquake construction:An example along the Tanlu Fault

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Science China Earth Sciences 2024年第5期67卷 1687-1697页

作者： feng hu huajian YAO Houyun YU Zeyu LU Jieyi HOU Song LUO Zhigang SHAO Xiaofei CHEN School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Mengcheng Geophysical National Field Scientific Observatory Hefei 230026China Department of Earth and Space Science Southern University of Science and TechnologyShenzhen 518055China Institute of Earthquake Prediction China Earthquake AdministrationBeijing 100036China

As a famous deep and large fault in eastern China,the Tanlu Fault passes through Anhui,Jiangsu,and Shandong and into northeastern *** is important to improve the understanding of seismic hazard assessments in areas near *** start a scenario earthquake simulation in the M7.5 earthquake potential area of the Xinyi-Sihong segment of the Tanlu *** fault rupture length and width are constrained according to the scaling law of large intraplate earthquakes,the background normal stress is depth dependent,and the initial shear stresses are determined using trial and error by matching the earthquake *** the 120 km rupture length of the M7.5 earthquake,we compare the horizontal uniform stress model and self-similar stress perturbation *** findings reveal that the seismic source time function of the horizontal uniform stress model is similar to that of the Haskell model and that of the self-similar stress perturbation model is more similar to that of a real earthquake *** compare the dynamic rupture simulation and ground motion results under four different stress conditions and find that the shorter the characteristic length of the self-similar function is,the rougher the initial *** the M7.5earthquake with an epicenter in the vicinity of Suqian,the Xinyi-Tancheng segment,which is located in the IX-intensity zone north of the epicenter,vibrates more strongly on the northern side than on the southern side due to the influence of the lowvelocity zone and the peak slip *** response spectra analysis at stations in the study area is useful for improving the earthquake resistance capability.

关键词： Scenario earthquakes Self-similar stress Tanlu Fault Dynamic rupture Ground motion

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MicroRNA-451a is a candidate biomarker and therapeutic target for major depressive disorder

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General Psychiatry 2024年第1期37卷 151-162页

作者： Panpan hu Qiuchen Cao hu feng Yun Liu Yan Chen Jingfan Xu Weixi feng huaiqing Sun huachen Ding Chun Wang Junying Gao Ming Xiao Jiangsu Key Laboratory of Neurodegeneration Nanjing Medical UniversityNanjingJiangsuChina Department of Neurology The First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsuChina Nanjing Brain Hospital Affliated to Nanjing Medical University NanjingJiangsuChina Functional Brain Imaging Institute of Nanjing Medical University NanjingJiangsuChina

Background Increasing evidence supports the role of microRNAs(miRNAs)in major depressive disorder(MDD),but the pathophysiological mechanism remains *** To explore the mechanism of microRNA-451a(miR-451a)in the pathology and behaviours of *** Abnormal miRNAs such as miR-451a reported previously in the serum of patients with MDD were screened and then confirmed in a mouse model of depression induced by chronic restraint stress(CRS).Eight-week-old male C57BL/6 mice had miR-451a overexpression in the medial prefrontal cortex(mPFC)via adeno-associated virus serotype 9 vectors encoding a pri-mmu-miR-451a-GFP fusion protein followed by behavioural and pathological ***,molecular biological experiments were conducted to investigate the potential mechanism of miR-451a against *** The serum levels of miRNA-451awere significantly lower in patients with MDD,with a negative correlation with the Hamilton Depression Scale ***,a negative association between serum miR-451a and behavioural despair or anhedonia was observed in CRS ***,miR-451a expression was significantly downregulated in the mPFC of CRS-susceptible *** miR-451a in the mPFC reversed the loss of dendritic spines and the depression-like phenotype of CRS ***,miR-451a could inhibit CRS-induced corticotropin-releasing factor receptor 1 expression via targeting transcription factor 2,subsequently protecting dendritic spine *** Together,these results highlighted miR-451a as a candidate biomarker and therapeutic target for MDD.

关键词： therapeutic medial behaviour

Precise separation and efficient recovery of Pd(Ⅱ) from high-level liquid waste by XAD-based adsorbents

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Rare Metals 2024年第10期43卷 5372-5390页

作者： Hao-Ran Dong Shun-Yan Ning Zeng-Yuan Li Si-Zhi Xu feng-Tao hu feng Gao You-Bin Wang Li-feng Chen Xiang-Biao Yin Toyohisa Fujita Mohammed F.Hamza Yue-Zhou Wei School of Resources Environment and MaterialsGuangxi University School of Nuclear Science and Technology University of South China

Efficient separation of palladium (Pd（II）) from high-level liquid waste （HLLW） not only helps the safe disposal of nuclear waste,but also is a vital importan supplement to Pd（II） ***,16 kinds of nove Amberlite XAD resins-based adsorbents were prepared by vacuum impregnation method for the separation of Pd（II）from simulated HLLW,and the MMBT/XAD7HP prepared using 4-methyl-2-mercaptobenzothiazole （MMBT） as ligand and Amberlite XAD7HP resin （XAD7HP） as the carrier was selected as the optimal research *** analysis experiments proved the successful preparation of MMBT/XAD7HP,which exhibited ultrahigh adsorption selectivity for Pd（II）(distribution coefficient （Kd）≥12584.5 ml·g-1,separation factor (SFPd/M)≥2818.4) and superior adsorption capacity(Q≥130.1 mg·g-1).The adsorption kinetics and adsorption isotherms for Pd（II） matched with pseudo-secondorder （PSO） kinetics model and Langmuir model,indicating that the adsorption mode for Pd（II） by MMBT/XAD7 HP was monolayer chemical *** dynamic column experiments showed that MMBT/XAD7 HP achieved efficiently separation of Pd（II） from simulated HLLW,and the recovery rate was nearly 100% The adsorption mechanism was analyzed by Fourier transform infrared spectroscopy （FTIR）,X-ray photoelectron spectroscopy （XPS） and density functional theory（DFT）,and the ultrahigh selectivity of MMBT/XAD7 HP is attributed to the preferred affinity of the soft-N,S donor atoms in MMBT for Pd（II）.MMBT has the shortest frontline molecular orbital energy band gap （HOMO–LUMO） among the four ligands,which makes it easier to become an electron donor to attract Pd2+to participate in ***3-participates in the adsorption to keep charge *** summary,MMBT/XAD7 HP has broad application prospects for the treatment of Pd（II） in HLLW

关键词： Adsorption Column experiments HLLW Palladium XAD

Bacteriophages assisted bacteria to facilitate soil multifunctionality under organochlorine pesticide contamination

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Science China Technological Sciences 2024年第10期67卷 3116-3128页

作者： ZHAO DuoKai CHAO huiZhen BALCAZAR Jose Luis WU ShiMao ZHENG XiaoXuan WU YunLing YUAN ShuJian SUN MingMing hu feng Soil Ecology Lab Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization and Jiangsu Key Laboratory for Solid Organic Waste UtilizationNanjing Agriculture University J.F.Blumenbach Institute of Zoology and Anthropology University of G?ttingen Catalan Institute for Water Research (ICRA) University of Girona College of Environmental and Resource Sciences Zhejiang University

As the most abundant living entities in the environment, viruses have been well recognized as crucial members in sustaining biogeochemical cycling. However, the significance of viruses in soil ecosystem multifunctionality remains under-explored. In this study, we used metagenomics and meta-viromics analysis to investigate the role of soil viruses in soil ecosystem functions under heavy, light, and no organochlorine pesticides(OCPs) contamination. In the three types of soil samples collected, lightcontaminated soils supported the highest level of multifunctionality, followed by heavy-contaminated soils and clean ***, our results revealed a positive correlation between bacterial community evenness and multifunctionality index(p <0.05). Dominant bacterial species with biodegradation and stress resistance advantages exhibited higher abundance in OCPaffected soils, potentially playing a core functional supporting role. Furthermore, our results indicated that the species richness and diversity of bacteriophages were positively correlated with multifunctionality(p < 0.05) in OCP-affected soils. Bacteriophages in OCP-affected soils regulate host metabolism and enhance soil ecosystem multifunctionality by infecting functional bacterial hosts and encoding AMGs related to soil element cycling. Our findings emphasize the potential effect of phages on ecosystem multifunctionality in contaminated soil, suggesting that phages may serve as contributors to soil ecology beyond bacteria and other microorganisms. Therefore, in polluted or constrained soils, further research could potentially translate phage communities and related ecological processes into artificial methods for application in soil pollution remediation or ecological restoration.

关键词： soil ecosystem multifunctionality viruses auxiliary metabolic genes organochlorine pesticides contamination