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Influence of Microstructural Evolution on the Hot Deformation Behavior of an Fe–Mn–Al Duplex lightweight Steel

Acta Metallurgica Sinica(English Letters) 2018年第4期31卷 389-400页

作者： li-xiong xu Hui-Bin Wu Xin-Tian Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China National Engineering Research Center of Advanced Rolling University of Science and Technology Beijing Beijing100083China

The hot deformation behavior of Fe-26Mn-6.2A1-0.05C steel was studied by experimental hot compression tests in the temperature range of 800-1050℃ and strain rate range of 0.01-30 s-1 on a Gleeble-3500 thermal simulation *** microstructural evolution during the corresponding thermal process was observed in situ by confocal laser scanning *** backscattered diffraction and transmission electron microscopy analyses were carried out to observe the microstructural morphology before and after the hot ***,interrupted compression tests were conducted to correlate the microstructural characteristics and softening mechanisms at different deformation *** results showed that hot compression tests of this steel were all carried out on a duplex matrix composed of austenite and *** the deformation temperature increased from 800 to 1050℃,the volume fraction of austenite decreased from 70.9% to 44.0%,while that of 6-ferrite increased from 29.1% to 56.0%.Due to the different stress exponents（n）and apparent activation energies（Q）,the generated strain was mostly accommodated by δ-ferrite at the commencement of deformation,and then both dynamic recovery and dynamic recrystallization occurred earlier in δ-ferrite than in *** interaction of strain partitioning and unsynchronized softening behavior caused an abnormal hot deformation behavior profile in the Fe-Mn-A1 duplex steel,such as yield-like behavior,peculiar work-hardening behavior,and dynamic softening behavior,which are influenced by not only temperature and strain rate but also by microstructural evolution.

关键词： Microstructural evolution Dual-phase steel lightweight component Hot deformation Dynamic recrystallization

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Prediction for Flow Stress of 95CrMo Hollow Steel During Hot Compression

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Acta Metallurgica Sinica(English Letters) 2017年第3期30卷 250-260页

作者： Bao-Sheng Xie Qing-Wu Cai Wei Yu li-xiong xu Zhen Ning Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China National Engineering Research Center of Advanced Rolling University of Science and Technology Beijing Beijing 100083 China

The compressive deformation behavior of 95CrMo hypereutectic steel was studied at temperatures ranging from 800 to 1050 ℃ and strain rates from 0.1 to 3 s-1 on a Gleeble-3500 thermo-simulation machine. The results showed that, with the decrease in deformation temperature and increase in strain rate, the fragmented retained austenite in finer and distributed more uniformly in the ferrite matrix as a result of the inhibited recovery. The recorded flow stress suggested that the stress level decreases with increasing temperature and decreasing strain rate. Based on the classical stress-dislocation relation, the constitutive equations of flow stress determined by work-hardening and softening mechanisms were estab- lished. A comparison between the experimental and calculated values confirmed the reliability of the model, and the predictability of the model was also quantified in terms of correlation coefficients and average absolute relative errors, which were found generally above 0.99 and below 2.50%, respectively. In the whole range of strain rate, the activation energy is 419.84 kJ/mol. By further identification based on Sch6ck＇s model and Kocks-Argon-Ashby model, the rate- controlling mechanism is found to be dislocation cross-slip.

关键词： Tempering 95CrMo hypereutectic steel Hot deformation behavior Hot compression Rate-controlling mechanism Constitutive model

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A Novel Multi-sensor Data Fusion Algorithm and Its Application to Diagnostics

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仪器仪表学报 2005年第Z1期26卷 788-790页

作者： li xiong xu Zongchang Dong Zhiming Academy of Armored Force Engineering Beijing 100072China Academy of Armored Force Engineering Beijing 100072China Academy of Armored Force Engineering Beijing 100072China

To Meet the requirements of multi-sensor data fusion in diagnosis for complex equipment systems,a novel, fuzzy similarity-based data fusion algorithm is given. Based on fuzzy set theory, it calculates the fuzzy similarity among a certain sensor's measurement values and the multiple sensor's objective prediction values to determine the importance weigh of each sensor,and realizes the multi-sensor diagnosis parameter data *** to the principle, its application software is also designed. The applied example proves that the algorithm can give priority to the high-stability and high -reliability sensors and it is laconic ,feasible and efficient to real-time circumstance measure and data processing in engine diagnosis.

关键词： Diagnostics Multi-sensor Data fusion Algorithm Engine

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Design, Syntheses and Biological Activities of Novel Anthranilic Diamide Insecticides Containing N-Pyridylpyrazole

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Chemical Research in Chinese Universities 2013年第1期29卷 51-56页

作者： ZHAO Yu li Yong-qiang xiong li-xia xu li-ping PENG li-na li Fang li Zheng-ming National Pesticidal Engineering Centre(Tianjin) State Key Laboratory of Elemento-organic Chemistry Nankai University Tianjin 300071 P. R. China

In search of environmentally benign insecticides with high activity, low toxicity and low residue, a series of novel anthranilic diamide derivatives containing N-pyridylpyrazole was designed and synthesized. All the compounds were characterized by H NMR spectroscopy and elemental analysis. The single crystal structure of com pound 8j was determined by X-ray diffraction. The insecticidal activities of the new compounds were evaluated. The results show that some compounds exhibited moderate insecticidal activities against Lepidoptera pests. Among this series of compounds, compounds 80 and 8p showed 100% larvicidal activity against Mythimna separate Walker, Plutella xylostella linnaeus and Laphygma exigua Hubner at a test concentration of 200 mg/kg, which is equal to the commercial chlorantraniliprole.

关键词： Anthranilic diamide Ryanodine receptor Insecticidal activity

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Condition Monitoring and Fault Diagnosis Based on Rough Set Theory

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仪器仪表学报 2005年第Z1期26卷 781-783页

作者： li xiong li Shengli xu Zongchang Academy of Armored Force Engineering Beijing 100072China Academy of Armored Force Engineering Beijing 100072China Academy of Armored Force Engineering Beijing 100072China

In order to raise the efficiency,automatization and intelligentization of condition monitoring and fault diagnosis for complex equipment systems,rough set theory is used to the field. A feature reduction algorithm based on rough set theory is adopted to extract condition information in monitoring and diagnosis for an engine,so that the technology condition monitoring parameters are optimized. The decision tables for each fault source are built and the diagnosis rules rooting in rough set reduction is applied to carry through intelligent fault diagnosis. The cases studied show that rough set method in condition monitoring and fault diagnosis can lighten the work burden in feature selection and afford advantages for autonomic learning and decision during diagnosis.

关键词： Condition monitoring Fault diagnosis Rough set theory Engine

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Tensile deformation behavior of nickel-free high-manganese austenitic cryogenic-temperature steel

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Journal of Iron and Steel Research International 2022年第5期29卷 793-801页

作者： Xin-tian Wang Hui-bin Wu Yang Gu li-xiong xu Peng-cheng Zhang Qi-bo Tang National Center for Materials Service Safety University of Science and Technology BeijingBeijing100083China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China

Nickel-free high-manganese austenitic Fe–24.4Mn–4.04Al–0.057C steel was produced by smelting,and the homogenized forged billet was *** plastic deformation mechanism was investigated through tensile testing of the hot-rolled *** characterization techniques such as scanning electron microscopy,transmission electron microscopy,electron backscattered diffraction,and X-ray diffraction were used to analyze the microstructural evolution of steel under different strain *** steel had a single austenite phase,which was stable during *** hot rolling,annealing twins were observed in the microstructure of the *** steel showed an excellent combination of mechanical properties,like a tensile strength of 527 MPa,impact energy of 203 J at−196℃,and an elongation of 67%till *** the initial deformation stage,the dislocations were generated within the austenite grains,entangled and accumulated at the grain boundaries and annealing twin *** twins participated in plastic deformation and hindered the dislocation *** the deformation progressed,the dislocation slip was hindered and produced stress concentration,and the stacking faults evolved into mechanical twins,which released the stress concentration and delayed the necking.

关键词： High-manganese steel Austenite grain Tensile deformation Mechanical twin Annealing twin

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Syntheses and Structures of Binaphthyl-bridged Schiff Bases

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Chemical Research in Chinese Universities 2008年第5期24卷 561-564页

作者： WANG Bin li Min-xiong xu Shan-sheng SONG Hai-bin WANG Bai-quan State Key Laboratory of Elemento-Organie Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China

The reaction of dinaphthofuran with lithium in anhydrous diethyl ether led to a solution of the corresponding C,O-dilithiated intermediate which, upon treatment with DMF at ？78 oC, afforded, after hydrolysis, 2＇-hydroxy-1,1＇-binaphthyl-2-carbaldehyde in a good yield. Then binaphthyl-bridged Schiff bases were prepared by the condensation of 2＇-hydroxy-1,1＇-binaphthyl-2-carbaldehyde with the corresponding aromatic amines.

关键词： Schiff base Binaphthyl compound Reductive ring opening

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A simple and versatile protocol for isolation of RNA from plant, fungi and animal

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Journal of Agricultural Science and Technology 2008年第1期2卷 63-65页

作者： QUE You-xiong li Wei xu Jing-sheng xu li-ping ZHANG Mu-qing Key Lab of Sugarcane Eco-Physiology ＆ Genetic Improvement Ministo of Agriculture Fuzhou 350002 China

Compared to other plants, the traditional protocols for RNA isolation from sugarcane （Saccharum） are usually cJeficient and result in poor yields, or low-quality. Here we describe a modified method for isolating RNA from various fissoes of S. officinarum, in which only Trizol and some routine reagents were needed. The absorbance at 260/280 nm ranges from 1.70 to 1.80, indicating that the quality of RNA is high, as confirmed by double-stranded cDNA synthesis and reverse ~ranscription-polymerase chain （RT-PCR）. This protocol can also be used effectively in RNA isolation from Erianthus arundinaceus, rice （Oryza sativa linnaeus）, Achyranthes, sporotrichum spp., Thermophil and loach （Misgurnus an g uillicaudatus ）.

关键词： Saccharum officinarum RNA polysaccharides polyphenols

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Investigation on Eperythrozoon Infection in Sheep in Xinjiang Region of China

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Animal Husbandry and Feed Science 2010年第3期2卷 25-27页

作者： ZHONG Fa-gang HE li-xiong HUANG Xin xu xue-ping Key Laboratory of Sheep Reproduction Biotechnology Xinjiang Production and Construction Corps Shihhotze 832000 China

[ Objective] To understand the epidemic status of Eperythrozoon ovis in sheep in Xinjiang region of China. [ Method ] A total of 850 blood samples were collected from seven sheep breeding areas in Xinjiang region. The Eperythrozoon ovis infection was detected by blood tablet examination, blood smear stained with Wright＇s stain and polymerase chain reaction （PCR）. [ Result] The infection rates were 97%, 97% and 75% when the samples were detected by blood tablet examination, blood smear stained with Wright＇s stain and PCR, respectively. Sheep eperythrozooo nosis occurred in the four seasons without seasonal epidemics. No obvious difference in infection rates was observed between the sheep breeding areas. The Eperythrozoon ovis infection was slight or mild in most cases, but the infection was severe in two periods, that is, from May to June and from November to December. [ Conclusion] The Eperythrozoon ovis infection is popular in sheep in Xinjiang region of China, and the main inducements may be changes in seasons and forage formula.

关键词： Eperythrozoon ovis Infection rate Sheep

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Differential distribution of PINK1 and Parkin in the primate brain implies distinct roles

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Neural Regeneration Research 2025年第4期20卷 1124-1134页

作者： Yanting liu Wei Huang Jiayi Wen Xin xiong Ting xu Qi Wang Xiusheng Chen Xianxian Zhao Shihua li Xiaojiang li Weili Yang Guangdong Key Laboratory of Non-human Primate Research Key Laboratory of CNS Regeneration(Ministry of Education)Guangdong-Hongkong-Macao CNS Regeneration Institute of Jinan UniversityJinan UniversityGuangzhouGuangdong ProvinceChina

The vast majority of in vitro studies have demonstrated that PINK1 phosphorylates Parkin to work together in mitophagy to protect against neuronal ***,it remains largely unclear how PINK1 and Parkin are expressed in mammalian *** has been difficult to address because of the intrinsically low levels of PINK1 and undetectable levels of phosphorylated Parkin in small *** this issue is critical for elucidating the in vivo roles of PINK1 and ***,we showed that the PINK1 kinase is selectively expressed as a truncated form(PINK1–55)in the primate *** the present study,we used multiple antibodies,including our recently developed monoclonal anti-PINK1,to validate the selective expression of PINK1 in the primate *** found that PINK1 was stably expressed in the monkey brain at postnatal and adulthood stages,which is consistent with the findings that depleting PINK1 can cause neuronal loss in developing and adult monkey ***1 was enriched in the membrane-bound fractionations,whereas Parkin was soluble with a distinguishable *** double staining experiments showed that PINK1 and Parkin did not colocalize under physiological conditions in cultured monkey astrocytes,though they did colocalize on mitochondria when the cells were exposed to mitochondrial *** findings suggest that PINK1 and Parkin may have distinct roles beyond their well-known function in mitophagy during mitochondrial damage.

关键词： neurodegeneration Parkin Parkinson’s disease PINK1 subcellular distribution

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