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Limit cycles in a generalized Gause-type predator-prey system

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Journal of Central South University of Technology 2001年第4期8卷 283-286页

作者： CHEN Hai bo,liu yi rong (Department of Applied Mathematics and Applied Software, Central South University, Changsha 410083, China) 1. Department of Applied Mathematics and Applied Software Central South University 410083 Changsha China

The qualitative behavior of solutions for a generalized Gause type predator prey system was studied.A large number of biological and bioeconomic models are special cases of this *** system was investigated in the region D={(x,y)|x>0,y>0} because of the biological meaning of the *** authors derived some sufficient conditions for the boundedness of the solutions and the existence of limit cycles of the system,which ensure that the system has at least one limit *** theory of limit sets of autonomous plane systems and the theorem of cycle field of Poincare Bendixson are efficiently employed in the *** main results and their consequences presented not only generalize some known results,but also improve some corresponding results of other authors.

关键词： generalized Gause-type predator-prey system boundedness periodic solution existence

高校老校区置换的类型选择与效益分析——以江苏省高校为例

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教育科学 2009年第5期25卷 48-53页

作者：刘义荣南通大学教育科学学院江苏南通226007

校区置换是多校区高校获取资金、缓解经费困难、化解债务负担、提高资源配置效率、降低办学成本、提高办学效益、加快校园文化融合、促进学科专业交融渗透的有效途径。但是,不同的置换类型所产生的经济与社会效益是不同的。校区置换,不... 详细信息

校区置换是多校区高校获取资金、缓解经费困难、化解债务负担、提高资源配置效率、降低办学成本、提高办学效益、加快校园文化融合、促进学科专业交融渗透的有效途径。但是,不同的置换类型所产生的经济与社会效益是不同的。校区置换,不仅要保障学校经济利益,更要注重城市文化传承与环境保护,服从城市整体规划与发展的要求,保障资源的最佳配置与利用,保障最佳的经济与社会效益。

关键词：高校校区置换类型选择效益

农村消费方式转变的机制与途径:消费集聚效应角度的分析

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中国软科学 2006年第10期 82-88页

作者：刘艺容湖南师范大学商学院

城乡居民消费方式的差异主要在于消费集聚程度不同。消费的外部性、规模经济性、循环积累因果关系和网络效应是形成这种消费集聚效应的重要原因。要运用现代信息技术、金融工具和商业新业态革新消费工具，完善消费制度，改善农村公共消... 详细信息

城乡居民消费方式的差异主要在于消费集聚程度不同。消费的外部性、规模经济性、循环积累因果关系和网络效应是形成这种消费集聚效应的重要原因。要运用现代信息技术、金融工具和商业新业态革新消费工具，完善消费制度，改善农村公共消费品供给，扩大农村公共消费空间，从而提高农村居民的消费集聚效应，缩小城乡消费方式的差别。

关键词：消费集聚效应城乡居民消费消费方式

Protective Effect of Ganshuang Granules(肝爽颗粒)on Liver Cirrhosis by Suppressing Regulatory T Cells in Mouse Model

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Chinese Journal of Integrative Medicine 2019年第1期25卷 51-58页

作者： liu Yan-min SHI Hong-bo liu yi-rong SHI Hong-lin REN Feng CHEN Yu CHEN De-xi LOU Jin-li DUAN Zhong-ping Department of Liver Diseases Immunology Beijing Youan Hospital Capital Medical University Beijing Institute of Hepatology Beijing Youan Hospital Capital Medical University Department of Toxic Hepatic Disease Beijing Youan Hospital Capital Medical University Artifical Liver Center Beijing Youan Hospital Capital Medical University Clinical Laboratory Center Beijing Youan Hospital Capital Medical University

Objective: To investigate the potential antifibrotic mechanisms of Chinese medicine Ganshuang Granules(肝爽颗粒, GSG) and to provide clinical therapeutic evidence of its effects. Methods: A cirrhotic mouse model was established by intraperitoneally injecting a mixture of CCl_4(40%) and oil(60%) at 0.2 mL per 100 g of body weight twice a week for 12 weeks. After 12-week modeling, GSG was intragastric administrated to the mice for 2 weeks, and the mice were divided into low-, medium-and high-dose groups at doses of 1, 2 and 4 g/(kg·day), respectively. Liver morphology changes were observed using Masson's trichrome staining and B-ultrasound. The levels of alanine aminotransferase(ALT), aspartate aminotransferase(AST) and hyaluronic acid(HA) in serum were detected using an automatic biochemistry analyzer. The expressions of desmin, smooth muscle actin(SMA) and Foxp3 in liver were detected by immunofluorescence. The regulatory T cell(Treg) frequency was determined through flow cytometry analysis. Collagen-Ⅰ, SMA, IL-6, tumor necrosis factor α(TNF-α), interleukin(IL)-1β and transforming growth factor β1(TGF-β1) expression levels were measured using quantitative polymerase chain reaction(qPCR). Results: Masson's staining result showed fewer pseudolobule structures and fibrous connective tissue in the GSG-treatment groups than in the spontaneous recovery group. Ultrasonography showed that GSG treatment reduced the number of punctate hyperechoic lesions in mice cirrhotic livers. The serum ALT, AST, HA levels were significantly ameliorated by GSG treatment(ALT: F=8.104, P=0.000; AST: F=7.078, P=0.002; and HA: F=7.621, P=0.001). The expression levels of collagen-Ⅰ and SMA in the cirrhotic livers were also attenuated by GSG treatment(collagen-Ⅰ: F=3.938, P=0.011; SMA: F=4.115, P=0.009). Tregs, which were elevated in the fibrotic livers, were suppressed by GSG treatment(F=8.268, P=0.001). The expressions of IL-6, TNF-α and IL-1β increased, and TGF-β levels decreased in the cirrhotic

关键词： Ganshuang Granules liver cirrhosis regulatory T cell hepatic stellate cell Chinese medicine

Biomechanical comparison of cervical transfacet pedicle screws versus pedicle screws

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Chinese Medical Journal 2008年第15期121卷 1390-1393页

作者： liu Guan-yi XU rong-ming MA Wei-hu SUN Shao-hua HUANG Lei yiNG Jiang-wei JIANG Wei-yu Department of Orthopaedics Ningbo Sixth People's Hospital Ningbo Zhejiang 315040 China

Background Transfacet pedicle screws provide another alternative for standard pedicle screw placement for plate fixation in the lumbar spine. However, few studies looking at transfacet pedicle screw fixation in the cervical spine are available. Therefore, cervical transfacet pedicle screw fixation and standard pedicle screw fixation techniques were biomechanically compared in this study. Methods Ten fresh human cadaveric cervical spines were harvested. On one side, transfacet pedicle screws were placed at the C3-4, C5-6, and C7-T1 levels. On the other side, pedicle screws were placed at the C3, C5, and C7 levels. The screw insertion technique at each level was randomized for right or left. The starting point for the transfacet pedicle screw insertion was located at the midpoint of the inferolateral quadrant of the lateral mass and the direction of the screw was about 50° caudally in the sagittal plane and about 45° toward the midline in the axial plane. Screws were placed from the inferior articular process, across the facet complex and the pedicle into the body of the caudal vertebra. The entry point for the pedicle screw was located at the midpoint of the superolateral quadrant of the lateral mass, and the direction of the screw was about 45° toward the midline in the axial plane and toward the upper third of the vertebral body in the sagittal plane. After screw placement we performed axial pullout testing. Results All the cervical transfacet pedicle screws and the pedicle screws were inserted successfully. The mean pullout strength for the transfacet pedicle screws was 694 N, while for the pedicle screws 670 N （P=0.013）. In all but six instances （10%）, the pedicle screw pullout values exceeded the values for the transfacet pedicle screws; this occurred three times at the C3/C4 level, twice at the C5/C6 level and once at the C7/T1 level. The greatest pullout strength difference at a single level was observed at the C5/C6 level, with a mean difference of 38 N （t=-1

关键词： cervical spine fixation transfacet pedicle screws pedicle screws

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中小民营商业经济的市场选择与文化定位

商业研究 2007年第8期 191-193页

作者：刘义荣南通大学后勤集团江苏南通226007

中小民营商业是我国市场经济中最早产生和发展起来的,数量最多、范围最广的经济组织。在促进商品流通、提供社会服务、推动市场发展中发挥了重要的作用。但由于受社会环境和传统文化的制约,中小民营商业发展缓慢、生命周期短暂几乎成为... 详细信息

中小民营商业是我国市场经济中最早产生和发展起来的,数量最多、范围最广的经济组织。在促进商品流通、提供社会服务、推动市场发展中发挥了重要的作用。但由于受社会环境和传统文化的制约,中小民营商业发展缓慢、生命周期短暂几乎成为普遍现象。因此,中小民营商业要能在良性轨道上健康发展,必须跨越企业传统文化的樊蓠,进行正确的市场选择和文化定位。

关键词：中小民营商业市场选择文化定位

江苏省区域经济落差原因与苏中苏北协调发展的路径思考

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学术交流 2006年第7期 82-85页

作者：刘义荣南通大学钟秀校区江苏南通226007

江苏区域经济由南向北产生阶梯式落差,尤其苏北远远落后于苏南。究其原因,区位优势和区域经济基础是形成发展落差的重要因素,而区域文化、传统观念、思维定势是形成落差的主要因素。应立足实际、发挥优势、整合资源、统一规划、综合开发... 详细信息

江苏区域经济由南向北产生阶梯式落差,尤其苏北远远落后于苏南。究其原因,区位优势和区域经济基础是形成发展落差的重要因素,而区域文化、传统观念、思维定势是形成落差的主要因素。应立足实际、发挥优势、整合资源、统一规划、综合开发,有效开辟区域经济发展新途径,创建区域经济发展新模式,促进苏中苏北经济快速协调发展。

关键词：江苏省区域经济协调发展

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复方紫青膏质量标准的研究

中华中医药杂志 2014年第7期29卷 2359-2361页

作者：刘易蓉梁光义周勇贵阳医学院贵阳550001 贵阳中医学院贵阳550002

目的:建立复方紫青膏的质量标准。方法:用薄层色谱法(TLC)对紫草、大黄、冬青进行定性鉴别,用高效液色谱法对膏剂中左旋紫草素进行含量测定。结果:TLC斑点圆整,分离度好,易于区别;左旋紫草素进样量在0.2032-1.2192μg的范围内与峰面积... 详细信息

目的:建立复方紫青膏的质量标准。方法:用薄层色谱法(TLC)对紫草、大黄、冬青进行定性鉴别,用高效液色谱法对膏剂中左旋紫草素进行含量测定。结果:TLC斑点圆整,分离度好,易于区别;左旋紫草素进样量在0.2032-1.2192μg的范围内与峰面积线性关系良好(r=0.9999),平均回收率为99.5%,RSD=1.7%(n=6)。结论:所用方法简便准确、重复性好,所建标准可用于复方紫青膏的质量控制。

关键词：复方紫青膏薄层色谱法高效液相色谱法质量标准

一类三次系统无穷远点的中心条件与赤道极限环分支

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工程数学学报 2006年第6期23卷 984-988页

作者：张齐刘一戎中南大学数学科学与计算技术学院长沙410075

本文研究了一类三次系统无穷远点的中心条件与赤道极限环分枝问题。通过将实平面系统转化为复系统研究,给出了计算无穷远点奇点量的递推公式,并在计算机上用Mathematica推导出该系统无穷远点前七个无穷远点奇点量,进一步导出了无穷远点... 详细信息

本文研究了一类三次系统无穷远点的中心条件与赤道极限环分枝问题。通过将实平面系统转化为复系统研究,给出了计算无穷远点奇点量的递推公式,并在计算机上用Mathematica推导出该系统无穷远点前七个无穷远点奇点量,进一步导出了无穷远点成为中心的条件和七阶细焦点的条件,得到了三次系统无穷远点分支出七个极限环的一个实例。

关键词：三次多项式系统无穷远点奇点量极限环分枝