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Electrocardiogram changes during hematoma enlargement in intracerebral hemorrhage patients

Neural Regeneration Research 2008年第9期3卷 1030-1033页

作者： Zhouping tang di Chen Xingyong Chen Xiangwu Meng Xuewei Xie Xiang Luo Suming Zhang Department of Neurology Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430030Hubei Province China

BACKGROUND： It has been reported that cerebrovascular disease causes changes in electrocardiogram results. OBJECTIVE： To investigate changes in electrocardiogram results in patients with intracerebral bematoma enlargement. DESIGN, TIME AND SETTING： The present case-retrospective analysis study was performed at the Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology from January 2005 to October 2006. PARTICIPANTS： A total of 225 intracerebral hemorrhage patients （142 males and 83 females） that were hospitalized at the Department of Neurology were enrolled the present study. The patient selection was in accordance with diagnostic criteria from the Fourth National Cerebrovascular disease Congress of China in 1995, and diagnosis was confirmed using computed tomography. All patients underwent computed tomography twice within 24 hours following intracerebral hemorrhage, and were subjected to electrocardiogram examination after admission. METHODS： According to hematoma enlargement following intracerebral hemorrhage, all patients were divided into hematoma enlargement （n = 20） and non-hematoma enlargement （n = 205） groups. Because of the large patient number difference between the two groups, the hematoma enlargement group was matched with the non-hematoma enlargement group. Patients meeting these conditions were included in the non-hematoma enlargement group. Finally, 75 patients were included in the final analysis, 19 in the hematoma enlargement group and 56 in the non-hematoma enlargement group. Clinical data from the two groups were statistically analyzed. MAIN OUTCOME MEASURES： The incidence of electrocardiographic abnormalities between the hematoma enlargement and non-hematoma enlargement groups. RESULTS： In the hematoma enlargement group, 15 patients （79%） developed electrocardiographic abnormafities. In the non-hematoma enlargement group, 24 patients （43%） presented with electrocardiographic abnormalities.

关键词： brain-heart syndrome electrocardiogram hematoma enlargement intracerebral hemorrhage

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A combined airfoil with secondary feather inspired by the golden eagle and its influences on the aerodynamics

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Chinese Physics B 2019年第3期28卷 246-255页

作者： di tang Zhongyong Fan Mingxia Lei Binbin Lv Li Yu Hao Cui College of Mechanical Engineering Zhejiang University of Technology High Speed Aerodynamic Institute China Aerodynamics Research and Development Center Zhejiang Museum of Natural History Shenyang Aircraft Design and Research Institute of AVIC

Bird flight is a remarkable adaption that has allowed thousands of species to colonize all terrestrial habitats. A golden eagle has impressive flying abilities, such as hovering, perching, preying and attacking. To reveal the flying abilities, avian geometry of a golden eagle was extracted based on noncontact surface measurements using a ROMBER three-dimensional laser scanner. distributions of a camber line, thickness and a secondary feather line of the extracted point cloud were fitted using convenient analytical expressions. A traditional airfoil was established with the camber line and thickness, then a combined airfoil was constructed by combining the traditional airfoil with a secondary feather. Oscillations of an airfoil as well as rapid pitch up were simplified as a sine wave around the quarter chord axis. Thereafter, both steady and unsteady aerodynamic performances of the airfoil are computed, the influences of the secondary feather on the steady and unsteady aerodynamics were further studied.

关键词： aerodynamics large prey secondary feather three-dimensional scanning

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Effect of interface morphology on the mechanical properties of titanium clad steel plates

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International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 404-408页

作者： Ji-xiong Liu Ai-min Zhao Hai-tao Jiang di tang Xiao-ge Duan Heng-yong Shui Research Institute of Metallurgy Engineering University of Science and Technology BeijingBeijing 100083China

Interface morphology has important influence on the bond quality of titanium clad steel plates. The mechanical properties of titanium clad steel plates with wavy and straight interfaces were investigated by tensile-shear tests and bending tests. The interface morphology of the plates was examined by optical microscopy （OM） and scanning electron microscopy （SEM）. The experimental results show that the shear strength of a wavy interface is higher than that of a straight interface. A wavy interface is the guarantee for obtaining high shear strength to provide a greater shear resistance. During the maerobending process, cracks appear in the swirl of the wave tip and ferrotitanium intermetallies. For in-situ observing the bending process by SEM, the wave tip of a wavy interface and the massive ferrotitartium intermetallies of a straight interface are places where cracks initiate and propagate. The results are the same as those observed in the macrobending process. Became of high hardness, the wave tip and the massive ferrotitanium intermetallies are hard in terms of compatible deformation.

关键词： clad metals cladding titanium low carbon steel interfaces morphology mechanical properties

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Low Cycle Fatigue Behavior and Deformation Mechanism of TWIP Steel

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Journal of Iron and Steel Research International 2014年第3期21卷 352-358页

作者： Yan-xin WU di tang Hai-tao JIANG Zhen-li MI Yao XUE Hai-peng WU Engineering Research Institute University of Science and Technology Beijing

Low cycle fatigue behavior of TWIP （twinning induced plasticity） steel was investigated in axial symmetric tension-compression cyclic loading pattern. Fracture surfaces and microstructures were examined by optical, scanning electron and transmission electron microscopes. It was found that the fatigue life at the strain amplitude of 0.4 % is up to 15 000 cycles, which is much longer than TRIP780 and HSLAS00 steels. The strain hardening and softening features are significant until the strain amplitude comes to 1.25 ~. Persistent slip bands and tiny mechanical twinning layers were observed after fatigue deformation. Deformation mechanism of TWIP steel at low cycle fatigue process is not only twinning, but a complex of both twinning and persistent slip bands.

关键词： TWIP steel low cycle fatigue fatigue property persistent slip band

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Survey and Analysis on the Status Quo of Occupational Risk Perception of Teachers in Public Vocational Colleges in an Underdeveloped Area

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Journal of Contemporary Educational Research 2023年第9期7卷 40-45页

作者： di tang International College Krirk UniversityBangkok 10220Thailand

This paper selects the teachers of public higher vocational college(College A)in underdeveloped areas to participate in the analysis,and conducts a questionnaire survey using the occupational risk perception questionnaire of higher vocational teachers.A total of 223 higher vocational teachers were selected to participate in the survey in order to understand the status quo of occupational risk perception of higher vocational *** survey results show that the Cronbach’sαcoefficient of occupational risk perception scale for higher vocational teachers is 0.846,and the Kaiser-Meyer-Olkin(KMO)is *** education legal liability risk,workload risk,and career development risk are the highest average occupational risk perception of higher vocational *** conclusion,the occupational risk perception scale of higher vocational teachers compiled in this study has good reliability and *** occupational risk perceived by teachers in public higher vocational colleges is relatively high.

关键词： Public higher vocational college teachers Occupational risk Risk perception

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Precipitation behaviors of X80 acicular ferrite pipeline steel

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 309-313页

作者： Ai-min Zhao Yan Wang1 Yin-li Chen di tang Xu-tao Gao Bi-qiang Zuo Research Institute of Metallurgy Engineering University of Science and Technology Beijing. Beijing 100083 China Rolling Mill Business division WISDRI Engineering ＆ Research Incorporation Limited C＊ mpany Wuhan 430223 China

The precipitation behaviors of X80 acicular ferrite pipeline steel were investigated by using transmission electron microscopy （TEM） and energy dispersive spectroscopy （EDS）. The results show that dendritic precipitates in the as-cast steel slabs precipitate mainly in grain boundaries, and these dendritic precipitates dissolve and re-precipitate to two kinds of carbonitrides： Ti- and Nb-rich （Ti, Nb）（C, N） carbonitrides during reheating. Four types of precipitates mainly exist in the hot rolled plate： Ti-rich carbonitrides resulted from the dendritic carbonitrides undissolved during the reheating process; Ti-rich carbonitrides re-precipitated along austenite grain boundaries during the re-heating process; NbC carbides mainly heterogeneously nucleated on the small pre-existing Nb-rich carbonitrides in the hot rolling process; and NbC carbides precipitated on dislocations during hot rolling.

关键词： pipeline steel precipitation ferrite carbonitride dissolution

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Microstructure, property and deformation and fracture behavior of 800 MPa complex phase steel with different coiling temperatures

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Journal of Iron and Steel Research International 2021年第3期28卷 346-359页

作者： Jian-zhong Xue Zheng-zhi Zhao di tang Hui Li Hao-hong Wu Wei-liang Xiong Liang Liang Yao Huang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing100083China VALIN LY STEEL Co. Ltd.Loudi417000HunanChina China Electric Power Research Institute Beijing100085China

The microstructure characteristics and properties(especially hole expansion property)of 800 MPa hot-rolled complex phase steel with different coiling temperatures were *** microstructure consisted of polygonal ferrite and precipitates when the steel was coiled at 550℃,and when the steel was coiled between 460–520℃,the microstructure was composed of granular bainite and martensite and austenite(M/A)*** morphology of the crack was analyzed by scanning electron microscopy,and the in situ scanning electron microscope tensile test was used to find out the fracture mechanism and deformation behavior of the steel with different coiling *** the steel was coiled at 550℃,the cracks initiated at the ferrite grain boundary and propagated through the grains or along the grain *** the steel was coiled at 520℃,the cracks first initiated at the junction of ferrite and M/A island and then propagated through the *** steel coiled at 520℃ has quite good mechanical properties and relatively high hole expansion ratio.

关键词： Complex phase steel Coiling temperature Strength In situ tensile test Hole expansion ratio Crack

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Influence of Inclusion on Corrosion Behavior of E36 Grade Low-alloy Steel in Cargo Oil Tank Bottom Plate Environment

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Journal of Iron and Steel Research International 2014年第11期21卷 1016-1021页

作者： Hui-bin WU Jin-ming LIANG di tang Xiao-tong LIU Peng-cheng ZHANG Yuan-jie YUE National Engineering Research Center of Advanced Rolling Technology University of Science and Technology Beijing

Corrosion behavior of low-alloy steel was investigated in simulated cargo oil tank （COT） bottom plate service environment （10% NaCl solution, pH = 0.85）. The corrosion behavior of inclusion was studied by in-situ scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. It was found that pitting corrosion was inclined to occur around the place where inclusions exist. After initial corrosion, an area of 10-20μm in diameter was formed as a cireinate cathode around the edge of inclusion. MnS inclusion dissolved in the simulated COT corrosion solution before low-alloy steel matrix, and pitting was formed at the place where MnS dissolved. TiO2 inclusion dissolved in the simulated COT corrosion solution after low alloy steel matrix, and pitting was formed at the place where steel matrix dissolved. The corrosion tended to occur at the area where the curvature radius of inclusion is smaller. The size of round TiO2 inclusions had little influence on corrosion behavior in this certain environment.

关键词： cargo oil tank corrosion behavior low alloy steel pitting mechanism inclusion

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The grafts modified by heparinization and catalytic nitric oxide generation used for vascular implantation in rats

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Regenerative Biomaterials 2018年第2期5卷 105-114页

作者： Jingchen Gao Li Jiang Qinge Liang Jie Shi ding Hou di tang Siyuan Chen Deling Kong hufangWang State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Bioactive Materials for Ministry of EducationCollege of Life SciencesNankai UniversityTianjin 300071China

Small-diameter(<6mm)vascular grafts are increasingly needed in peripheral vascular surgery but have few successes because of acute thrombosis,incomplete endothelialization and intimal hyperplasia after *** study used ... 详细信息

Small-diameter(dified polyethyleneimine were introduced through layer-by-layer assembly in order to build a vascular graft with in situ nitric oxide(NO)*** aim of this study was to explore the application of the graft with improved histocompatibility and biological function for vascular implantation in *** implantation in rats,compared to poly(ε-caprolactone),the modified grafts could promote the adhesion and proliferation of endothelial cells,and inhibit the adhesion of smooth muscle *** modified grafts remarkably promoted endothelialization,inhibited intimal hyperplasia and increased the ratio of alternatively activated macrophages(M2)to classical activated macrophages(M1).This work constructed a vascular graft with heparinization and catalytic NO generation for improving the vascularization,and accelerating the tissue regeneration by regulating the inflammatory *** present study indicates that it is a promising method for regulating response and tissue regeneration of small diameter vascular grafts by a novel approach of combining heparinization and catalytic NO generation.

关键词： vascular grafts heparin nitric oxide macrophage polarization

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Study on Microstructure and Property of H13 die Steel with Nitrogen

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稀有金属材料与工程 2011年第S3期40卷 234-236页

作者： Chen Yulai, Liu Biao, Zhao Peng, tang di, Li Jingyuan University of Science and Technology Beijing, Beijing 100083,China Univ Sci & Technol Beijing 100083 Peoples R China

Composition segregation and microstructure nonuniform of H13 steel have been obviously improved though adding nitrogen element. The microstructure and property of H13 steel with nitrogen contents of 0.021% and 0.085% are studied under various quenching and tempering states. Dual quenching that is quenching between 1000-1010 ℃ twice is employed in order to increase the tensile strength and hardness of coupons. The temperature and time are explored for improving the toughness under optimal quenching treatment. For extrusion die steel, the tensile strength can reach a satisfactory level and impact toughness are met the requirements of NADCA at the temperature.

关键词： H13 steel nitrogen chemical composition mechanical property

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