检索结果-南通市图书馆

Aortic Arch Atherosclerosis——An Important Potential Source Of Cerebral Embolic Stroke

在线全文

学校读者我要写书评

暂无评论

中国临床神经科学 2000年第Z1期8卷 55-页

作者： yi guo Shao wen Zhang Si Chen Department of neurology: Shenzhen People Hospital Shenzhen 518020 Department of neurology: Shenzhen People Hospital Shenzhen 518020 Department of neurology: Shenzhen People Hospital Shenzhen 518020

　　Background and purpose: Recent years with use of transesophageal echography renew awareness of aortic atherosclerosis. The purpose of this study was to determine the prevalence, clinical significance, and embolic potential of thoracic aortic plaque in patients with cerebral emblism; and further study the correlation aortic plaque with carotid or heart disease. Method: 49 consecutive patients with cerebral embolism was included in this sutdy. We uscd TEE to evaluated potential source of emboli in aortic arch and heart, and duplex in carotid artery. A atherosclerotic lesion of thoracic aorta was defined as normal(O); mild plaque (1); moderate plaque (2); protruding plaque or mobile plaque (3). Result: 31(63%) patients showed evidence of AAA; 7 (14.3%) patients had mild AAA, 9 (18.4%) patients had moderate AAA and 15 (32.7%) patients had severe AAA, In these 15 patients 11 patients neither severe ICAA or embolic heart disease, the AAA may be responsible to the cerebral embolism; 33 patients had internal carotid arterial atherosclerosis(ICAA), 9 patients had embolic heart disease; Age, ICAA had significant correlated with aortic plaque. Conclusion: Aortic atherosclerosis is common in cerebral embolism. Aortic plaque might be not only responsible for some unexplained embolic event, but also for some of the embolic stroke in the group of patient do have carotid artery or heart disease. Age might be important risk factor for the development of atherosclerotic lesion in the thoracic aorta.

关键词： heart disease cerebral embolism thoracic aorta carotid artery potential source risk factor aortic arch

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

原发性闭角型青光眼的出生顺序分析

复旦学报（医学版） 2006年第1期33卷 56-59页

作者：严新凤郭文毅孟炜江峰孙兴怀复旦大学公共卫生学院流行病学教研室上海200032 复旦大学附属眼耳鼻喉科医院眼科上海200031

目的分析原发性闭角型青光眼（primary angle closure glaucoma,PACG）患者的出生顺序效应,探讨环境因素及遗传因素与PACG的关系.方法应用Greenwood-Yule和Haldane-Smith的出生顺序方法,对来自复旦大学附属眼耳鼻喉科医院的200例PACG患... 详细信息

目的分析原发性闭角型青光眼（primary angle closure glaucoma,PACG）患者的出生顺序效应,探讨环境因素及遗传因素与PACG的关系.方法应用Greenwood-Yule和Haldane-Smith的出生顺序方法,对来自复旦大学附属眼耳鼻喉科医院的200例PACG患者以及18例同胞患者进行出生顺序研究.结果Greenwood法分析结果显示,出生顺序为1～3的子代中PACG患者实际分布大于期望分布,而出生较晚的子代中则实际分布小于期望分布,提示PACG多发生于出生较早的子代.Haldane法结果显示,∑6A实际值为3 310,∑6A期望值为3 610,两者相差两个标准差（S=121.91）以上,且有统计学差异,进一步提示PACG同出生顺序有关,且出生顺序越早越容易发生PACG.结论PACG的发生与出生顺序有关,好发于出生顺序较早的个体.

关键词：原发性闭角型青光眼出生顺序家系研究

The Qixiangzhan Lava Flow at the Tianchi Volcano:Eruptive Dynamics,Emplacement Mechanism and Implications for the Formation of Long-lived Magmatic Systems Prior to Caldera-forming Eruptions

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2025年第1期99卷 114-125页

作者： LI Jiahui SHAN Xuanlong yi Jian WU Chengzhi Ventura GUIDO LIU Pengcheng guo Jiannan WANG Wei College of Earth Science Jilin UniversityChangchun 130061China International Center of Future Science Changchun 130061China Changbaishan Tianchi Volcano Observatory AntuJilin 133613China Istituto Nazionale di Geofisica e Vulcanologia Roma 00143Italy Istituto per lo Studio degli impatti Antropici e Sostenibilitàin ambiente marino(IAS) Capo Granitola(TP)91021Italy Tianjin Branch of the China National Offshore Oil Company Ltd. Tianjin 300452China

The 7 ka old Qixiangzhan lava flow(QXZ,Tianchi volcano)represents the last eruptive event before the 946 CE,caldera-forming‘Millennium’eruption(ME).Petrographic,whole rock,mineral composition,Sr-Nd isotopic data on QXZ show that:(a)the lava consists of two components,constituted by comenditic obsidian fragments immersed in a continuous,aphanitic component;(b)both components have the same geochemical and isotopic variations of the ME *** QXZ and ME comendites result from fractional crystallization and crustal assimilation *** temperature of the QXZ magma was about 790℃ and the depth of the magma reservoir around 7 km,the same values as estimated for *** had a viscosity of 10^(5.5)-10^(9) Pa s and a velocity of 3-10 km/*** emplacement time was 0.5-1.6yr and the flow rate 0.48-1.50 m^(3)/*** values lie within the range estimated for other rhyolitic flows *** QXZ lava originated through a mixed explosive-effusive activity with the obsidian resulting from the ascent of undercooling,degassing and the fragmentation of magma along the conduit walls,whereas the aphanitic component testifies to the less undercooled and segregated flow at the center of the *** QXZ lava demonstrates the extensive history of the ME magma chamber.

关键词： lava flow rhyolitic volcanism eruptive mechanism long-lived magmatic systems Tianchi volcano Qixiangzhan Formation

预时效温度及回归加热速率对7055铝合金组织及性能的影响

在线全文

学校读者我要写书评

暂无评论

中国有色金属学报 2014年第5期24卷 1141-1150页

作者：冯迪张新明邓运来刘胜胆吴泽政郭奕文中南大学材料科学与工程学院长沙410083 中南大学有色金属材料与工程教育部重点实验室长沙410083

利用硬度、电导率与拉伸性能测试,结合差示扫描量热法(DSC)和透射电镜(TEM)研究预时效温度和回归加热速率对7055铝合金力学性能和电导率的影响,并讨论各RRA制度下微观组织的变化。结果表明:由于7055铝合金中厚板在回归加热过程中存在慢... 详细信息

利用硬度、电导率与拉伸性能测试,结合差示扫描量热法(DSC)和透射电镜(TEM)研究预时效温度和回归加热速率对7055铝合金力学性能和电导率的影响,并讨论各RRA制度下微观组织的变化。结果表明:由于7055铝合金中厚板在回归加热过程中存在慢速升温过程,近峰时效作为预时效制度更适合7055铝合金中厚板的回归再时效处理。经过(105℃,24 h)→3°/min(190℃,50 min)+(120℃,24 h)的三级时效处理,7055铝合金中厚板强度和电导率优于T6和T73状态的综合性能。

关键词：预时效温度回归加热速率 7055铝合金中厚板

宁波地区50岁及以上人群白内障流行病学调查

在线全文

学校读者我要写书评

暂无评论

眼科新进展 2019年第6期39卷 564-567页

作者：吴晓兰易全勇邬一楠王育文袁建树郭文毅宁波市眼科医院眼科浙江省宁波市315040 上海交通大学附属第九人民医院眼科上海市200011

目的调查宁波地区50岁及以上人群白内障患病率、手术情况及白内障盲社会负担率,评价宁波地区防盲治盲工作效果。方法采用随机整群抽样方法,于2015年3月至2016年7月在宁波地区随机抽取50岁及以上人群6059人作为调查对象,予以问卷调查、... 详细信息

目的调查宁波地区50岁及以上人群白内障患病率、手术情况及白内障盲社会负担率,评价宁波地区防盲治盲工作效果。方法采用随机整群抽样方法,于2015年3月至2016年7月在宁波地区随机抽取50岁及以上人群6059人作为调查对象,予以问卷调查、视力、眼压、电脑验光、裂隙灯显微镜、眼底镜检查。分析白内障的患病率,评估主要致盲眼病,并分析不同因素对白内障患病率的影响。结果实际5448位受检者中白内障患者1265例,患病率为23.22%。高龄、户外工作、沿海社区、糖尿病人群白内障患病率明显增高,差异均有统计学意义(均为P<0.05)。在236眼行白内障手术中,213眼接受白内障超声乳化吸出联合人工晶状体植入术,术后日常生活视力≥0.7占28.81%,白内障盲手术覆盖率为85.11%,白内障盲社会负担率为1.73%。结论宁波地区白内障手术覆盖率较高,接受白内障手术人群多。今后宁波地区的防盲工作不但要提高白内障手术数量,而且要努力提高手术质量。

关键词：白内障患病率手术覆盖率社会负担率

外周血内IgG4水平与冠状动脉病变程度的相关性分析

在线全文

学校读者我要写书评

暂无评论

医学综述 2016年第8期22卷 1615-1617页

作者：周伟郭文怡第四军医大学西京医院心血管内科西安710000

目的探讨外周血内免疫球蛋白G4(IgG4)水平与冠状动脉病变程度的相关性。方法选择2013年9月至2015年4月第四军医大学西京医院收治的342例患者为研究对象,依据冠状动脉造影检查结果分为冠心病组(CHD组)242例和非CHD组100例,其中CHD组又分... 详细信息

目的探讨外周血内免疫球蛋白G4(IgG4)水平与冠状动脉病变程度的相关性。方法选择2013年9月至2015年4月第四军医大学西京医院收治的342例患者为研究对象,依据冠状动脉造影检查结果分为冠心病组(CHD组)242例和非CHD组100例,其中CHD组又分为3个亚组:不稳定型心绞痛(UAP)组159例,稳定型心绞痛(SAP)组47例,急性心肌梗死(AMI)组36例。分别对比各组外周血内的IgG4及冠状动脉病变程度相关性。结果 CHD组患者外周血IgG4水平高于非CHD组[(0.47±0.15)mmol/L比(0.37±0.14)mmol/L],SAP组低于UAP组,AMI组高于UAP组,AMI组高于SAP组,差异有统计学意义(P<0.05)。SAP组冠状动脉病变支数和Gensini评分低于UAP组[(1.81±0.34)支比(2.36±0.44)支,(31±9)分比(48±14)分],AMI组[(2.06±0.29)支,(44±11)分]高于SAP组,差异有统计学意义(P<0.05)。在CHD组中,IgG4水平与冠状动脉Gensini评分和冠状动脉病变支数呈正相关(r=0.341,0.312,P<0.05)。结论 IgG4与冠状动脉病变程度间存在一定相关性,检测血清IgG4水平有助于帮助判断冠心病的严重程度。

关键词：冠心病免疫球蛋白G4 免疫反应冠状动脉病变相关性

在线全文

学校读者我要写书评

暂无评论

基于UML的审计系统的分析与设计

计算机工程与设计 2006年第15期27卷 2779-2781页

作者：李丽萍郭文夷周晓云上海第二工业大学计算机与信息学院上海201209

UML是一种标准的建模语言,它支持面向对象的分析与设计。审计是安全数据库系统的一个重要组成部分,它在监督系统正常运行、控制用户行为、检测潜在攻击、分析事故原因等方面有非常重要的作用。通过对基于UML的审计系统的分析与设计,展示... 详细信息

UML是一种标准的建模语言,它支持面向对象的分析与设计。审计是安全数据库系统的一个重要组成部分,它在监督系统正常运行、控制用户行为、检测潜在攻击、分析事故原因等方面有非常重要的作用。通过对基于UML的审计系统的分析与设计,展示了UML建模在系统开发中的应用,对B1级审计系统的开发也有一定的借鉴作用。

关键词：统一建模语言用例数据库安全审计 B1级安全标准

Effect of Nb-V microalloying on the hot deformation behavior of medium Mn steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 360-368页

作者： Yumeng Wang Qinyi guo Bin Hu Haiwen Luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The influence of Nb-V microalloying on the hot deformation behavior and microstructures of medium Mn steel(MMS)was investigated by uniaxial hot compression *** establishing the constitutive equations for simulating the measured flow curves,we successfully constructed deformation activation energy(Q)maps and processing maps for identifying the region of flow *** concluded the following consequences of Nb-V alloying for MMS.(i)The critical strain increases and the increment diminishes with the increasing deformation temperature,suggesting that NbC precipitates more efficiently retard dynamic recrystallization(DRX)in MMS compared with solute Nb.(ii)The deformation activation energy of MMS is significantly increased and even higher than that of some reported high Mn steels,suggesting that its ability to retard DRX is greater than that of the high Mn content.(iii)The hot workability of MMS is improved by narrowing the hot processing window for the unstable flow stress,in which fine recrystallized and coarse unrecrystallized grains are present.

关键词： medium manganese steel niobium-vanadium microalloying flow behavior dynamic recrystallization hot workability

DIGNN-A:Real-Time Network Intrusion Detection with Integrated Neural Networks Based on Dynamic Graph

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 817-842页

作者： Jizhao Liu Minghao guo College of Computer Zhongyuan University of TechnologyZhengzhou450007China

The increasing popularity of the Internet and the widespread use of information technology have led to a rise in the number and sophistication of network attacks and security *** detection systems are crucial to network security,playing a pivotal role in safeguarding networks from potential ***,in the context of an evolving landscape of sophisticated and elusive attacks,existing intrusion detection methodologies often overlook critical aspects such as changes in network topology over time and interactions between *** address these issues,this paper proposes a real-time network intrusion detection method based on graph neural *** proposedmethod leverages the advantages of graph neural networks and employs a straightforward graph construction method to represent network traffic as dynamic graph-structured ***,a graph convolution operation with a multi-head attention mechanism is utilized to enhance the model’s ability to capture the intricate relationships within the graph structure ***,it uses an integrated graph neural network to address dynamic graphs’structural and topological changes at different time points and the challenges of edge embedding in intrusion detection *** edge classification problem is effectively transformed into node classification by employing a line graph data representation,which facilitates fine-grained intrusion detection tasks on dynamic graph node feature *** efficacy of the proposed method is evaluated using two commonly used intrusion detection datasets,UNSW-NB15 and NF-ToN-IoT-v2,and results are compared with previous studies in this *** experimental results demonstrate that our proposed method achieves 99.3%and 99.96%accuracy on the two datasets,respectively,and outperforms the benchmark model in several evaluation metrics.

关键词： Intrusion detection graph neural networks attention mechanisms line graphs dynamic graph neural networks