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Compensation temperature and hysteresis behaviors of a graphene-like bilayer:Monte Carlo Study

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Communications in Theoretical Physics 2023年第4期75卷 131-143页

作者： bo-chen li Dan Lv Wei Wang Lei Sun Zi-Ming Hao Jia Bao School of Science Shenyang University of TechnologyShenyang 110870China School of Environmental and Chemical Engineering Shenyang University of TechnologyShenyang 110870China

Using the Monte Carlo method,the compensation temperature and hysteresis loops of a ferrimagnetic mixed spin-3/2 and spin-5/2 Ising-type graphene-like bilayer are investigated induced by different physical parameters such as crystal field,exchange coupling,external magnetic field,and *** variations of magnetization,magnetic susceptibility,specific heat,and internal energy with the change of temperature are *** addition,we also plot the phase diagrams including transition temperature and compensation ***,multiple hysteresis loops under certain parameters are given.

关键词： graphene-like bilayer magnetization compensation temperature hysteresis loop Monte Carlo method

Human adipose tissue-and umbilical cord-derived stem cells: which is a better alternative to treat spinal cord injury?

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Neural Regeneration Research 2020年第12期15卷 2306-2317页

作者： Ai-Mei liu bo-li chen ling-Tai Yu Tao liu ling-ling Shi Pan-Pan Yu Yi-bo Qu Kwok-Fai So li-Bing Zhou Guangdong-Hongkong-Macao Institute of CNS Regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan UniversityGuangzhouGuangdong ProvinceChina Guangzhou Regenerative Medicine and Health Guangdong Laboratory GuangzhouGuangdong ProvinceChina Co-innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina

Multiple types of stem cells have been proposed for the treatment of spinal cord injury,but their comparative information remains *** this study,a rat model of T10 contusion spinal cord injury was established by the impactor *** umbilical cord-derived mesenchymal stem cells(UCMSCs)or human adipose tissue-derived mesenchymal stem cells(ADMSCs)(2.5μL/injection site,1×10^5 cells/μL)was injected on rostral and caudal of the injury segment on the ninth day after *** injected with mesenchymal stem cell culture medium were used as *** results show that although transplanted UCMSCs and ADMSCs failed to differentiate into neurons or glial cells in vivo,both significantly improved motor and sensory *** spinal cord injury,UCMSCs and ADMSCs similarly promoted spinal neuron survival and axonal regeneration,decreased glial scar and lesion cavity formation,and reduced numbers of active *** analysis of spinal samples showed a specific increase of interleukin-10 and decrease of tumor necrosis factorαin the ADMSC group,as well as a downregulation of macrophage inflammatory protein 3αin both UCMSC and ADMSC groups at 3 days after cell *** of interleukin-10 and interleukin-13 was observed in both UCMSC and ADMSC groups at 7 days after cell *** tagging for relative and absolute quantitation proteomics analyses showed that UCMSCs and ADMSCs induced changes of multiple genes related to axonal regeneration,neurotrophy,and cell apoptosis in common and specific *** conclusion,UCMSC and ADMSC transplants yielded quite similar contributions to motor and sensory recovery after spinal cord injury via anti-inflammation and improved axonal ***,there were some differences in cytokine and gene expression induced by these two types of transplanted *** experiments were approved by the Laboratory Animal Ethics Committee at Jinan University(approval No.20180228026)on Febru

关键词： behavior central nervous system factor inflammation model spinal cord stem cells transplantation

Framework for Freeway Auto-surveillance from Traffic Video

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Journal of Systems Science and Information 2009年第3期7卷 215-230页

作者： bo li Qimei chen Communication Technology Research Institute Nanjing University Nanjing 210093 China

Video based surveillance systems have been widely used on freeway for traffic monitoring, as the cameras can provide the most intuitionistic information. In order to manage all the traffic videos automatically, in this paper, a distributed real-time auto- surveillance system is presented. The freeway traffic videos are taken as input video from Pan Tilt Zoom （PTZ） camera, and then produces an analysis of the states and activity of the vehicles in the region of interested （ROI）, if there is any abnormal instance, an alarm and corresponding traffic video are sent to awake surveillants by Ethernet. To achieve this functionality, our system relies on three main procedures. The first one initializes the system. It detects the ROI of the scene, and performs the camera calibration to remove the perspective effect of the incoming image. The second one segments moving vehicles from the images, eliminate shadow and tracks them real-time. It uses a set of methods to obtain the background of the image, extracts the moving regions and tracks these moving regions by matching them between frames of the video sequence to obtain high-level information such as color, size, velocity, and trajectories of moving vehicles. In the third procedure, activities of vehicles are analyzed based on a series of preset situations which would happen on freeway. The detail information of each vehicle and the global statistical information are checked to find out any abnormal instance, and then triggered an alarm. We present details of the system, together with experiment results which demonstrate the accuracy and time responses.

关键词： Auto-surveillance camera calibration shadow eliminating traffic video

Silencing SMYD3 in hepatoma demethylates RIZI promoter induces apoptosis and inhibits cell proliferation and migration

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World Journal of Gastroenterology 2007年第43期13卷 5718-5724页

作者： li-bo chen Jun-Yao Xu Zhen Yang Guo-Bin Wang Hepatobiliary center UnionHospital of Huazhong University of Science & TechnologyWuhan 430022 Hubei province China Department of General Surgery The SecondAffiliated Hospital of Sun Yat-seu University Guangzhou 510120Guangdong province China Department of integrated surgery Tongji Hospital ofHuazhong University of Science & Technology Wuhan 430030Hubei province China

AIM： To investigate the role of SMYD3 in hepatocellular carcinoma （HCC） development and progression and to verify whether its regulation activity was through RIZ1 inactivation. METHODS： Expression of SMYD3 in HCC cell lines and tissues were measured; silencing of SMYD3 by RNA interference （RNAi） was effectuated, hepatoma cell proliferation, migration and apoptosis were tested, with RIZl CpG promoter methylation, and corresponding mRNA expression were investigated. RESULTS： SMYD3 over-expression in HCC was associated with RIZl hypermethylation and mRNA down-expression. Suppression of SMYD3 expression de- methylated RIZl CpG promoter （P 〈 0.01） and increased RIZl mRNA expression （P 〈 0.01）. Consequently, SMYD3 down-expression with RIZl de-methylation strongly inhibited hepatoma cell growth （MTT inhibitory rates： Pgenesil-1-s1 60.95%± 7.97%, Pgenesil-1-s2 72.14% ± 9.68% vs Pgenesil-1-hk 6.89% ± 4.12%, P 〈 0.01） and migration （Pgenesil-1-s1 4.24% ± 1.58%, Pgenesil- 1-s1 4.87% ± 0.73% vs Pgenesil-1 19.03% ± 4.63%, Pgenesil-1-hk 19.95% ±5.21%, P 〈 0.01） and induced apoptosis （FCM subG1 phase Pgenesil-1-s1 19.07% ＋ 1.78%, Pgenesil-1-s2 17.68% ± 2.36% vs Pgenesil-1 0.47% ± 0.12%, Pgenesil-1-hk 1.46% ± 0.28%, P 〈 0.01. TUNEL-positive cells： Pgenesil-1-s1 40.24%± 5.18%, Pgenesil-1-s2 38.48% ± 4.65% vs Pgenesil-1 2.1B% - 1.34%, Pgenesil-1-hk 2.84%± 1.22%, P 〈 0.01） in HepG2 cells. CONCLUSION： These results demonstrate that SMYD3plays a critical role in the carcinogenesis and progression of HCC, The proliferation, migration induction and apoptosis inhibition activities of SMYD3 may be mediated through RIZl CpG promoter hypermethylation.

关键词： SMYD3 Hepatocellular carcinoma Retinoblastoma protein-interacting zinc finger gene Histone methyltransferase DNA methylation

Effect of Kruppel-like Factor 4 on Notch Pathway in Hepatic Stellate Cells

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2016年第6期36卷 811-816页

作者： Yin-kai XUE Jun TAN Dong-wei DOU Ding chen Lu-jia chen Huan-ping REN li-bo chen Xin-gao XIONG Hai ZHENG Department of Emergency Surgery Union Hospital Tongji Medical College Huazhong Univerfsity of Science and Technology Wuhan 430022 China

The relationship between Kruppel-like factor 4（KLF4） and the Notch pathway was determined to investigate the effect of KLF4 on the activation of hepatic stellate cells and underlying *** SPF BALB/c mice were randomly divided into two groups.A liver fibrosis model was established in 25 mice as the experimental group,and the remaining 25 mice served as *** the day 0,7,14,and 35,liver tissues were removed for immunofluorescent *** Notch pathway inhibitor DAPT was added to the primary original hepatic stellate cells,and KLF4 and Notch-associated factor expression was detected by q ***,the hepatic stellate cell line LX-2 was used to establish control and experimental groups,and was cultured in ***-2 cells in the experimental groups were treated with DAPT and the Notch activator transforming growth factor-beta 1 separately,whereas those in the control group were given isotonic culture *** 48 h,KLF4 expression was examined by Western *** transient transfection of LX-2 cells to increase KLF4,the expression of Notch factor was *** analysis showed that,with the aggravation of liver fibrosis,the absorbance（A） values of KLF4 were decreased（day 0：980.73±153.19;day 7：1087.99±230.23;day 14：390.95±93.56;day 35：245.99±87.34）.The expression of Notch pathway-related factors（Notch-1,Notch-2,and Jagged-1） in the hepatic stellate cell membrane was negatively correlated to KLF4 *** the increase of KLF4 expression,Notch-2（0.73±0.13） and Jagged-1（0.43±0.12） expression decreased,whereas Notch-1 level was not *** the Notch pathway was inhibited,KLF4 levels generally increased（18.12±1.31）.Our results indicate that KLF4 expression is negatively correlated to the Notch pathway in hepatic stellate cells,which may provide a reference for the treatment of hepatic fibrosis.

关键词： KLF4 Notch hepatic fibrosis hepatic stellate cells

CRITICAL EXAMINATION OF WETLANDS ECOSYSTEM SERVICE IN SHANGHAI, CHINA

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湿地科学 2005年第4期3卷 279-285页

作者： Zhao Bin Yang Feng-Hui Gao Yu Ma Zhi-Jun li bo chen Jia-Kuan Key Laboratory for Biodiversity Science and Ecological Engineering Ministry of Chinese Education Institute of Biodiversity Science Fudan University Shanghai 200433 China

Wetlands provide many important services to human society, but are at the same time ecologically sensitive and adaptive systems, and are under heavy pressure. As a wetland city, Shanghai city has various types of natural wetlands (chiefly, includes coastal, riverine, lacustrine, and reservoir and pond wetlands), which account for 23.5% of total areas. Meanwhile, Shanghai is a metropolitan city, being confronted with the pressure of port expansion and urban and industrial sprawl, just like the other megalopolises in the world. Based on our earlier study on estimating the ecological service values of wetlands in Shanghai, this paper analyzed the ecological functions of the wetland city, such as nutrient cycling, water regulation and supply, food supply, disturbance control, water treatment, habitats and refugia, aesthetic, education and culture, tidal flats and potential land resources. Unfortunately, the wetland function was being degraded and the ecosystem service was discounted accordingly because of over-reclamation, over-fishing, water pollution, and rapid urbanization in the city. It’s therefore recommended that, to improve the environment of Shanghai ciry, and make the ecosystems sustainable function appropriately, the effective wetland management strategies should be taken.

关键词：生态系统生态功能湿地上海

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应用积分图的织物瑕疵检测快速算法

纺织学报 2016年第11期37卷 141-147页

作者：董蓉李勃徐晨南通大学电子信息学院江苏南通226019 南京大学电子科学与工程学院江苏南京210093

为解决现有基于图像处理的织物瑕疵检测算法实时性较差、正确率偏低等问题,提出一种包含学习和检测2个阶段的瑕疵检测算法。通过对无瑕疵模板图像的梯度能量特征及其分布特性的学习,自适应获得检测阶段所需的参数。一方面利用积分图原... 详细信息

为解决现有基于图像处理的织物瑕疵检测算法实时性较差、正确率偏低等问题,提出一种包含学习和检测2个阶段的瑕疵检测算法。通过对无瑕疵模板图像的梯度能量特征及其分布特性的学习,自适应获得检测阶段所需的参数。一方面利用积分图原理将任意大小的图像块内的求和运算化简为三次加法运算,快速提取织物图像的梯度能量特征,实现织物瑕疵的实时检测,另一方面利用核函数拟合特征参数分布,结合均值漂移法求解分布峰值获得自适应的瑕疵判定阈值参数,实现织物瑕疵的准确分割。通过实验将本文算法与现有基于局部二值模式特征、小波特征、规则带特征等算法进行对比,针对包含3种纹理6类瑕疵的织物图像数据集的测试结果显示,本文算法平均处理时间为56 ms,正确率为97%。

关键词：织物瑕疵检测积分图特征提取核函数均值漂移

ASSESSMENT OF MYOCARDIAL VIABIliTY WITH CONTRAST-ENHANCED MAGNETIC RESONANCE IMAGING AND COMPARISON WITH SINGLE-PHOTON EMISSION COMPUTED TOMOGRAPHY

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Chinese Medical Sciences Journal 2006年第4期21卷 239-244页

作者： Yi-ning Wang Zheng-yu Jin Zhu-hua Zhang ling-yan Kong li-bo chen Lu Zhou Hong-yi Sun Heng Zhang Qi Miao Department of Radiology Department of Nuclear Medicine Department of CardiacSurgery Peking Union Medical College Hospital Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100730

Objective To compare contrast-enhanced magnetic resonance imaging （ceMRI） with nuclear metabolic imaging for the assessment of myocardial viability in patients with chronic ischemic heart disease. Methods Twenty patients with suspected chronic ischemic heart disease underwent ceMRI and technetium-99m sestamibi single-photon emission computed tomography （SPECT）. Patients with positive SPECT results also underwent 18 F-fluorodeoxyglucose （FDG） SPECT. In a 17-segment model, the segmental extent of hyperenhancement （SEH） by ceMRI was compared with segmental FDG and sestamibi uptake by SPECT. Correlation between the extent of hyperenhancement by ceMRI and left ventricular function was analyzed. Seven patients got negative results both in ceMRI and technetium-99m sestamibi SPECT. The rest 13 patients with positive results then underwent ^18F-FDG SPECT. In 221 segments of 13 patients, SEH was （2. 1±8.2）%, （25.0±13.7 ）%, and （57. 7±23.6 ）% in segments with normal metabolism/perfusion, metabolism/perfusion mismatch, and matched defects, respectively, and there were significant differences between either two of them （ all P 〈 0.05）. By receiver operating characteristic curve analysis, the area under the curve was 0. 95 for the differentiation between viable and non-viable segments. At the cutoff value of 34%, SEH optimally differentiated viable from non-viable segments defined by SPECT. Using this threshold, the sensitivity and specificity of ceMRI to detect non-viable myocardium as defined by SPECT were 92% and 93%, respectively. Hyperenhancement size by ceMRI was correlated negatively with the left ventricular ejection fraction （ r = - 0.90, P 〈 0.01 ） and positively with left ventricular volumes （ r = 0. 62 for end-diastolic volume, r = 0.75 for end-systolic volume, both P 〈 0.05 ）. Conclusion CeMRI allows assessment of myocardial viability with a high accuracy in patients with chronic ischemic heart disease.

关键词： magnetic resonance imaging single-photon emission computed tomography myocardialviability

The Mechanism of Heating Rate on the Secondary Recrystallization Evolution in Grain Oriented Silicon Steel

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 275-282页

作者： GAO Qian li Jun WANG Xianhui CAO Laifu GONG Jian li bo Central Iron and Steel Research Institute Group Beijing 100081China Shougang Zhixin Electromagnetic Material R&D(Beijing)Co. Ltd.Beijing 101300China Beijing Shougang Co. Ltd.Qian’an 064404China

Grain-oriented silicon steels were prepared at different heating rates during high temperature annealing,in which the evolution of magnetic properties,grain orientations and precipitates were *** illustrate the Zener factor,the diameter and number density of precipitates of interrupted testing samples were statistically *** effect of precipitate ripening on the Goss texture and magnetic property was *** indicated that the trend of Zener factor was similar under different heating rates,first increasing and then decreasing,and that the precipitate maturing was greatly inhibited as the heating rate *** recrystallization was developed at the temperature of 1010℃when a heating rate of 5℃/h was used,resulting in Goss,Brass and{110}oriented grains growing abnormally and a magnetic induction intensity of ***,increasing the heating rate to 20℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss ***,when the heating rate was extremely fast,such as 40℃/h,poor secondary recrystallization was developed with many island grains,corresponding to a decrease in magnetic induction intensity to 1.87 *** a suitable heating rate of 20℃/h,the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset secondary recrystallization temperature of 1020℃were found among the experimental variables in this *** heating rate affected the initial temperature of secondary recrystallization by controlling the maturation of precipitates,leading to the deviation and dispersion of Goss texture,thereby reducing the magnetic properties.

关键词： high temperature annealing heating rate secondary recrystallization grain oriented silicon steel