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Study on sintering process and characteristic of nanosized soft magnetic MnZn ferrite powders

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Rare Metals 2006年第Z1期25卷 531-535页

作者： wang yongming wang Xin JIANG Yanfei HAO Shunli LIU Chunjing School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China

The effect of sintering process (especially the sintering temperature) on the magnetic property and microstructure of sintered sample of nanosized soft magnetic MnZn ferrite powder was investigated. The sintered sample of MnZn ferrite was prepared by both traditional pressing and cool isostatic pressing on MnZn ferrite nanoparticals. The sintering process of which was segmented. The density, microstructure and phase composition of sintered sample were analyzed by Archimedes′law, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The grain growth and densification in sintering process of MnZn ferrite were investigated. The magnetic property was measured by vibrating sample magnetometer (VSM) and Nim2000 magnetic material testing system. The results show that the better sintering temperature is 850 ℃, at which the better magnetic property and microstructure of sintered compact were obtained.

关键词： MnZn ferrite sintering temperature microstructure magnetic property

Sintering process and grain growth of Mn-Zn ferrite nanoparticles

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Rare Metals 2006年第Z1期25卷 526-530页

作者： wang Xin CUI Yinfang wang yongming HAO Shunli LIU Chunjing School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China

The density, microstructure and magnetic properties of non-doped Mn-Zn ferrite nanoparticles sintered compacts were investigated. The compacts of non-doped Mn-Zn ferrite nanoparticles were sintered by segmented-sintering process at lower sintering temperature. The density of sintered samples was measured by Archimedes method, and the phase composition and microstructure were examined by XRD and SEM. The sintered Mn-Zn ferrite magnetic measurements were carried out with Vibrating Sample. The results show that the density of sintered compacts increases with the rising of sintering temperature, achieving 4.8245 g·cm-3 when sintered at 900 ℃, which is the optimal density of Mn-Zn functional ferrite needed and from the fractured surface of sintered samples, it can be seen that the grain grows well with small grain size and homogeneous distribution.

关键词： Mn-Zn ferrite sintering temperature grain growth density magnetic properties

A New Observation Operator for the Assimilation of Satellite-Derived Relative Humidity:Methodology and Experiments with Three Sea Fog Cases over the Yellow Sea

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Journal of Meteorological Research 2021年第6期35卷 1104-1124页

作者： Yue YANG yongming wang Shanhong GAO Xiayu YUAN Key Laboratory of Physical Oceanography College of Oceanic and Atmospheric SciencesOcean University of ChinaQingdao 266100China School of Meteorology University of OklahomaNormanOK 73072USA Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China

Assimilation of satellite-derived relative humidity(Satellite-RH)is capable of improving sea fog forecasts by saturating the background in the observed foggy *** studies have achieved saturation by increasing the moisture only(Method-q).However,this method can lead to large wetting and warming biases within the marine atmospheric boundary layer(MABL).A new method using an RH observation operator(Method-RH)is designed to alleviate these biases by simultaneously adjusting the moisture and the *** comparison,saturation is also achieved by decreasing the temperature only(Method-t).The three Satellite-RH assimilation methods are implemented within the Gridpoint Statistical Interpolation-based three-dimensional variational system and examined for three sea fog cases over the Yellow *** three cases on 28 April 2007,9 April 2009,and 29 March 2015 fail to be predicted without the Satellite-RH assimilation as their MABLs have both warming and drying,drying,and warming biases,*** and evaluations show that Method-RH has the best overall performance of the three methods in terms of the forecast of sea fog and MABL structures as only Method-RH can fully or partially address all the bias scenarios in forecasting sea *** with Method-q,Method-RH produces more well-defined sea fog areas by adding a smaller amount of moisture as well as decreasing the *** with Methodt,Method-RH enlarges the sea fog areas by increasing the amount of moisture in addition to the cooling.

关键词： assimilation of satellite-derived relative humidity observation operator for relative humidity sea fog marine atmospheric boundary layer

Stress protein expression in early phase spinal cord ischemia/reperfusion injury

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Neural Regeneration Research 2013年第24期8卷 2225-2235页

作者： Shanyong Zhang Dankai Wu Jincheng wang yongming wang Guoxiang wang Maoguang Yang Xiaoyu Yang Team of Spine and Spinal Cord Department of Orthopedics China-Japan Friendship Hospital of Jilin University Team of Skeletal Trauma Department of Orthopedics the Second Hospital of Jilin University

Spinal cord ischemia/reperfusion injury is a stress injury to the spinal cord. Our previous studies using differential proteomics identified 21 differentially expressed proteins （n 〉 2） in rabbits with spinal cord ischemia/reperfusion injury. Of these proteins, stress-related proteins included protein disulfide isomerase A3, stress-induced-phosphoprotein 1 and heat shock cognate protein 70. In this study, we established New Zealand rabbit models of spinal cord ischemia/reperfusion injury by abdominal aorta occlusion. Results demonstrated that hind limb function initially improved after spinal cord ischemia/reperfusion injury, but then deteriorated. The pathological morphology of the spinal cord became aggravated, but lessened 24 hours after reperfusion. However, the numbers of motor neurons and interneurons in the spinal cord gradually decreased. The expression of protein disulfide isomerase A3, stress-induced-phosphoprotein 1 and heat shock cognate protein 70 was induced by ischemia/reperfusion injury. The expression of these proteins increased within 12 hours after reperfusion, and then decreased, reached a minimum at 24 hours, but subsequently increased again to similar levels seen at 6-12 hours, showing a characterization of induction-inhibition-induc- tion. These three proteins were expressed only in cytoplasm but not in the nuclei. Moreover, the expression was higher in interneurons than in motor neurons, and the survival rate of interneurons was greater than that of motor neurons. It is assumed that the expression of stress-related proteins exhibited a protective effect on neurons.

关键词： neural regeneration spinal cord ischemia/reperfusion injury protein disulfide isomerase A3 stress-induced-phosphoprotein 1 heat shock cognate protein 70 neuron necrosis apoptosis grants-supported paper neuroregeneration

Mechanically robust and dynamic supramolecular polymer networks enabled by[an]daisy chain backbones

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Science China Chemistry 2024年第12期67卷 4234-4241页

作者： yongming wang Yi Ding Yuhang Liu Shaolei Qu Wenbin wang Wei Yu Zhaoming Zhang Feng Liu Xuzhou Yan School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Supramolecular polymer networks(SPNs)have garnered significant research interest due to their dynamic ***,while current developments primarily focus on managing supramolecular crosslinks,the role of polymer backbones—equally crucial to SPN properties—has not yet been sufficiently ***,we utilize mechanically interlocked[an]daisy chain as backbone to prepare a class of SPNs,where the force-induced motion of successive mechanical bonds toughens and reinforces the *** specific,the[an]daisy chain backbones connect with polynorbornene chains through quadruple H-bonding in the SPN *** to the control with non-slidable backbone,The representative SPN-2 exhibits a robust feature in tensile tests with high maximum stress(14.7 vs.7.89 MPa)and toughness(83.8 vs.48.6 MJ/m^(3)).Moreover,it also has superior performance in energy dissipation benefitting from the[an]daisy chain backbones as well as supramolecular ***,the SPN-2 displayed exceptional self-healing and reprocessing capabilities due to their dynamic quadrable H-bonding *** findings demonstrate the untapped potential of[an]daisy chain as a polymer skeleton to develop SPNs and open the door to design mechanically robust supramolecular materials with diverse smart functions.

关键词： supramolecular polymer networks mechanical bond [an]daisy chains self-healing dynamic materials

Preparation and properties of nanosize MnZn ferrite from δ-FeOOH

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Rare Metals 2006年第Z1期25卷 466-470页

作者： HAO Shunli wang Xin WEI Yu wang yongming Liu Chunjing School of Material and Engineering Hebei University of Technology Tianjin 300130 China 　 College of Chemistry Hebei Normal University Shijiazhuang 050016 China 　　

Ferrous ion was transformed into feroxyhyte (δ-FeOOH) by oxidation. Then, manganese sulfate and zinc sulfate in some ratio were added to the feroxyhyte solution. The co-precipitation was boiling reflux conditions sometime under constant stirring. The nanosize MnZn ferrite powder was formed. The mechanism of preparation of the nanosize MnZn ferrite was discussed, and the formation of feroxyhyte which was playing a key role during the process was mentioned. The properties of powder was tested by means of X-ray diffraction, transmission electron microscopy and vibrating sample magnetometer. The results show that the samples of spherical particles about 20 nm, which have characteristics of ferrimagnetism, has larger saturation magnetization, but the remanent magnetization and coercivity are comparatively smaller. The spinel MnZn ferrite nanosize powder was successfully prepared from δ-FeOOH at low temperature, with low-carbon steel and peroxide as main material.

关键词： nanosize MnZn ferrite feroxyhyte preparation characterization

Thermo-responsive topological metamorphosis in covalent-and-supramolecular polymer architectures

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Aggregate 2022年第6期3卷 122-127页

作者： yongming wang Hao Zhang Zhaoming Zhang Jun Zhao Ruixue Bai Yuhang Liu Xinhai Zhang Xuzhou Yan School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghaiP.R.China

Topological metamorphosis represents a powerful approach to modulate the properties of ***,it still remains a major challenge to achieve the tunability of bulk mechanical properties via topological transformation in supramolecular polymer ***,we couple the covalent polymer and supramolecular polymer in a single system—referred to as covalent-and-supramolecular polymer(CSP)—to realize a thermo-responsive macromolecular *** CSP is able to topologically switch from grafted polymer to cross-linked network by taking advantage of synergistic dynamic covalent interactions and host–guest *** from the topologically structural transformation,brittleness intrinsically evolves into toughness in our CSP architectures with minimum change of their molecular compositions from furan–maleimide to anthracene–maleimide *** work demonstrates that supramolecular polymers are a promising platform to design smart materials not only due to their inherent stimuli-responsive properties but also because of their abilities in determining bulk mechanical properties of polymers with alterable topological structures.

关键词： dynamic materials host-guest chemistry stimuli-responsiveness supramolecular polymers topological metamorphosis

Isolation and Identification of Haemophilus parasuis SD02 strain

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Animal Husbandry and Feed Science 2018年第2期10卷 126-128,141页

作者： wang yongming wang Xiaoli Shandong Huahong Bioengineering Co. Ltd.

A bacterial strain was isolated from the sick pigs suspiciously infected by polyserositis and arthritis in a pig farm in Shandong Province, and identified through morphological observation, culture traits, bioehemical characteristics and PCR amplifieation. Additionally, primers were de- signed according to the 16S rRNA sequence of Haemophihzs parasuis, and the bacterial strain was amplified by PCR. The amplified fragments of approximately 1 400 bp was sequenced, and aligned with the sequence in GenBank. The results showed that it shared the homology of 97%-99% with the 16S rRNA sequence of foreign ***, and confirmed as *** （HPS）. The strain was determined as serotype 4 through serotype identification. The strain was named SD02.

关键词： Haemophilus parasuis Isolation and identification PCR Serotype

Master microRNA-222 regulates cardiac microRNA maturation and triggers Tetralogy of Fallot

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Signal Transduction and Targeted Therapy 2022年第6期7卷 1895-1898页

作者： Chao Li Hongdou Li Xiaoying Yao Dong Liu yongming wang Xinyi Huang Zhongzhou Yang Wufan Tao Jian-Yuan Zhao Hongyan wang Obstetrics and Gynecology Hospital NHC Key Laboratory of Reproduction RegulationShanghai Institute of Planned Parenthood ResearchState Key Laboratory of Genetic EngineeringSchool of Life Sciencesand Children’s HospitalFudan University200438 ShanghaiChina Shanghai Key Laboratory of Metabolic Remodeling and Health Institute of Metabolism and Integrative BiologyInstitute of Reproduction and DevelopmentFudan University200438 ShanghaiChina School of Life Science Key Laboratory of Neuroregeneration of Jiangsu and Ministry of EducationCo-innovation Center of NeuroregenerationNantong University226019 NantongChina State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animal for Disease Study Nanjing University Medical School211166 NanjingChina Institute of Developmental Biology&Molecular Medicine Fudan University200438 ShanghaiChina

Dear Editor,Tetralogy of Fallot(TOF)is the most common complex congenital heart *** gene mutations and copy number variants,altered protein function induced by posttranscriptional or translational regulation also contributes to the onset of TOF.1 MiRNAs are short noncoding RNAs that bind to the 3’-UTR of target mRNAs to repress protein ***,the causal link between miRNAs and TOF and the underlying mechanism has not been established.

关键词： Fallot congenital cardiac