检索结果-南通市图书馆

Radiological insights of ectopic thyroid in the porta hepatis: A case report and review of the literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第14期9卷 3432-3441页

作者： Outesh Chooah Jing Ding Jing-Le fei Fang-Yi Xu Ting Yue Cai-Ling pu Hong-Jie Hu Department of Radiology Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310016Zhejiang ProvinceChina

BACKGROUND Ectopic thyroid is defined as a rare developmental anomaly where thyroid tissues are atypically found in locations other than its normal anatomical position:Anterolateral to the second,third,and fourth tracheal *** intemperate descent or a migration failure of the thyroid anlage results in sub-diaphragmatic thyroid ectopia,a sparse clinical *** SUMMARY This case portrays a 63-year-old female patient presenting with chronic abdominal discomfort at a local hospital whereby a computed tomography(CT)scan revealed a well-defined mass in the hepatic *** further examination,the patient underwent a CT scan with contrast,magnetic resonance imaging(MRI),and CT-angiography(CTA)at our *** CT scan showed a welldefined and high attenuated mass measuring 43 mm×38 mm in the hepatic entrance with *** CTA revealed an additional finding:Blood supply to the mass from the right hepatic *** of the upper abdomen demonstrated a mass with mixed signal intensity on T1 and T2 weighted images in the hepatic *** patient underwent surgery with resection of the mass which was sent for *** thyroid at the level of porta hepatis with nodules was the definitive diagnosis since histopathological report revealed presence of thyroid tissue in the resected liver *** This case delivers a rare insight of pre-operative radiological imaging of an ectopic thyroid located in the *** findings can aid in narrowing down potential differential diagnosis when managing a patient with those subsequent findings.

关键词： Ectopic thyroid Porta hepatis Computed tomography Computed tomography

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

基于最优间距的车辆跟驰模型及其特性

西南交通大学学报 2012年第5期47卷 888-894页

作者：杨达蒲云杨飞祝俪菱西南交通大学交通运输与物流学院四川成都610031

为真实地反应车辆跟驰机理,假设在跟驰状态下,驾驶员倾向于保持最优跟驰间距,在分析最优间距函数的基础上,建立了车辆跟驰模型(optimal distance model,ODM).利用NGSIM数据,对ODM模型和经典Gipps车辆跟驰模型进行参数标定和评价.用仿真... 详细信息

为真实地反应车辆跟驰机理,假设在跟驰状态下,驾驶员倾向于保持最优跟驰间距,在分析最优间距函数的基础上,建立了车辆跟驰模型(optimal distance model,ODM).利用NGSIM数据,对ODM模型和经典Gipps车辆跟驰模型进行参数标定和评价.用仿真方法分析了ODM模型再现宏观交通流现象的能力和加速度特性.研究结果表明:与Gipps模型相比,ODM模型的加速度、速度和距离的仿真精度分别提高了0.36 m/s2、0.99 m/s和0.73 m,并能够再现实际交通流中稳定车流和冲击波等交通现象;在稳定交通流中,ODM模型总是趋向于使车辆间距等于最优跟驰间距,或在其附近小幅度波动.

关键词：车辆跟驰最优间距 NGSIM 稳定性

复元醒脑汤对MCAO模型大鼠血脑屏障的保护作用及机制研究

在线全文

学校读者我要写书评

暂无评论

时珍国医国药 2024年第4期35卷 783-787页

作者：孙玉婷张文蒲玉婷吴霖光缙陈采玉徐湘茹费月蓉方邦江上海中医药大学附属龙华医院上海200032 上海中医药大学急危重症研究所上海200032

目的探究复元醒脑汤对急性缺血性脑梗死模型大鼠血脑屏障的影响及机制研究。方法取40只SD大鼠随机分为假手术组、模型组、复元醒脑汤组和尼莫地平组,除假手术组外,其余各组建立大鼠大脑中动脉栓塞制备缺血性脑梗死模型。假手术组和模型... 详细信息

目的探究复元醒脑汤对急性缺血性脑梗死模型大鼠血脑屏障的影响及机制研究。方法取40只SD大鼠随机分为假手术组、模型组、复元醒脑汤组和尼莫地平组,除假手术组外,其余各组建立大鼠大脑中动脉栓塞制备缺血性脑梗死模型。假手术组和模型组给予0.9%氯化钠溶液、复元醒脑汤组和尼莫地平组给予相应的等效剂量药物,每日灌胃2次,连续灌胃3d。采用Bederson神经功能评分;HE染色观察各组大鼠脑组织病理变化;采用IHC观察ZO-1和Claudin-5的表达;Western blot检测大鼠脑组织MMP-2、MMP-9、ZO-1和Claudin-5的蛋白表达情况;RT-qPCR检测大鼠脑组织MMP-2、MMP-9、ZO-1和Claudin-5基因表达水平。结果与假手术组比较,模型组大鼠神经功能缺损评分升高;与假手术组相比,模型组大鼠脑组织MMP-2和MMP-9蛋白和mRNA表达升高(P<0.05,P<0.01),ZO-1和Claudin-5蛋白mRNA表达降低(P<0.05,P<0.01);与模型组相比,复元醒脑汤组的大鼠脑组织缺血半暗带MMP-2和MMP-9蛋白mRNA表达显著降低(P<0.05,P<0.01);ZO-1和Claudin-5蛋白mRNA表达显著升高(P<0.05,P<0.01)。结论复元醒脑汤保护血脑屏障通透性,可能与抑制MMP-2和MMP-9的表达,抑制紧密连接蛋白中ZO-1和claudin-5降解及丢失,从而发挥保护血脑屏障结构功能的作用。

关键词：复元醒脑汤脑梗死血脑屏障金属基质蛋白酶紧密连接蛋白

在线全文

学校读者我要写书评

暂无评论

一种免洗速干手消毒剂消毒性能的相关研究

中国消毒学杂志 2024年第8期41卷 569-572页

作者：周于张天宝苏贵斌周剑晏强姜朴唐非华中科技大学同济医学院公共卫生学院环境医学研究所环境与健康教育部重点实验室湖北武汉430030 湖北省疾病预防控制中心武汉同济美迪生科技有限公司

目的检测一种免洗速干过氧化氢-乙醇手消毒剂的消毒相关性能及毒性。方法采用悬液定量杀灭试验、理化试验和动物毒性试验方法,检测该消毒剂对细菌、真菌及病毒的杀灭性能及其安全性。结果该手消毒剂以过氧化氢和乙醇为主要复合杀菌组分... 详细信息

目的检测一种免洗速干过氧化氢-乙醇手消毒剂的消毒相关性能及毒性。方法采用悬液定量杀灭试验、理化试验和动物毒性试验方法,检测该消毒剂对细菌、真菌及病毒的杀灭性能及其安全性。结果该手消毒剂以过氧化氢和乙醇为主要复合杀菌组分,过氧化氢含量为1470 mg/L,乙醇含量为体积分数80.1%。用该手消毒剂原液作用0.5、1.0、1.5 min,对金黄色葡萄球菌、大肠埃希菌和铜绿假单胞菌的杀灭对数值均>6.00,对白念珠菌平均杀灭对数值>5.00;对脊髓灰质炎病毒Ⅰ型疫苗株的平均灭活对数值>4.00;用该手消毒剂原液作手擦拭消毒,作用1 min对手上自然菌的杀灭对数值>1.00。该手消毒剂密封包装经37℃储存3个月,其有效成分含量下降率均<10%;该手消毒剂的皮肤刺激试验结果表明属无刺激性;急性经口毒性试验结果表明,对小鼠的毒性属实际无毒;小鼠骨髓嗜多染红细胞微核试验呈阴性。结论该过氧化氢-乙醇手消毒剂对细菌繁殖体、真菌和病毒均具有快速杀灭效果,属实际无毒级物质,其储存性能稳定。

关键词：手消毒剂细菌真菌病毒消毒效果

Efficiency improvement of AlGaN-based deep ultraviolet LEDs with gradual Al-composition AlGaN conduction layer

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2020年第4期16卷 279-283页

作者： HUANG Ping-yang XIAO Long-fei CHEN Xiu-fang WANG Qing-pu XU Ming-sheng XU Xian-gang HUANG Jing Center of Nanoelectronics and School of Microelectronics Shandong UniversityJinan 250100China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China School of Mechatronics Engineering Guizhou Minzu UniversityGuiyang 550025China

The low internal quantum efficiency(IQE)of AlGaN-based deep ultraviolet light emitting diode(DUV-LED)limits its wider *** main reasons for low IQE include low carrier concentration,poor carrier location and large *** bending of energy band between AlGaN electron blocking layer and conduction layer obstructs transport of holes to multiple quantum *** this paper,we propose a gradual Al-composition p-type AlGaN(p-AlGaN)conduction layer to improve the light emitting properties of AlGaN-based *** carrier concentration in the active region enhances the effective radiative recombination rate of the ***,the IQE of our optimazited DUV-LED is increased by 162%in comparison with conventional DUV-LEDs.

关键词： AlGaN Efficiency conduction

Vertical GaN Shottky barrier diode with thermally stable TiN anode

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第3期30卷 479-482页

作者： Da-Ping Liu Xiao-Bo Li Tao-fei pu Liu-An Li Shao-Heng Cheng Qi-Liang Wang Department of Physics Xinxiang UniversityXinxiang 453003China Institute of Technology and Science Tokushima UniversityTokushima 770-8506Japan School of Electronics and Information Technology Sun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory of Superhard Material Jilin UniversityChangchun 130012China

Vertical GaN Schottky barrier diodes with Ti N anodes were fabricated to investigate the electrical performance. The turn-on voltage and specific on-resistance of diodes are deduced to be approximately 0.41 V and 0.98 mΩ·cm2, *** current-voltage curves show rectifying characteristics under different temperatures from 25℃ to 200℃, implying a good thermal stability of Ti N/Ga N contact. The low-frequency noise follows a 1/f behavior due to the multiple traps and/or barrier inhomogeneous at Ti N/Ga N interface. The trapping/de-trapping between traps and Fermi level causes the slight capacitance dispersion under reverse voltage.

关键词： GaN Vertical Schottky barrier diode TiN interface quality

Prevalence and incidence of heart failure among community in China during a three-year follow-up

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2023年第4期20卷 284-292页

作者： Lu FU Jun-Rong JIANG Wei-Dong LIN Hui-Yi LIU Shu-Yu JIN Xing-Dong YE Yan-Lin CHEN Si-Jia pu yang LIU Shang-fei HE Shu-Lin WU Hai DENG Yu-Mei XUE Department of Cardiology Guangdong Cardiovascular InstituteGuangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouChina The Second School of Clinical Medicine Southern Medical UniversityGuangzhouChina School of Medicine South China University of TechnologyGuangzhouChina Department of Cardiology the First Affiliated Hospital of Guangzhou Medical UniversityGuangzhouChina Guangdong Provincial Key Laboratory of Clinical Pharmacology Research Center of Medical SciencesGuangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouChina Qinghai Province Cardio Cerebrovascular Disease Specialist Hospital XiningChina

BACKGROUND Epidemiological surveys on heart failure(HF)in Chinese community are relatively *** study aimed to estimate the prevalence and incidence of HF among community residents in southern *** Baseline data of this prospective study was collected from 2015 to 2017 among 12,013 permanent residents aged≥35years in Guangzhou,*** same survey process was carried out for individuals aged≥65 years after a three-year *** The overall prevalence of HF in community residents aged≥35 years was 1.06%.Male had significantly higher risk of HF prevalence[odds ratio(OR)=1.50,P=0.027].The gender-adjusted risk of HF was 1.48 times higher per 10 years *** prevalence was statistically associated with atrial fibrillation,valvular heart disease,hypertension and chronic obstructive pulmonary disease after adjusting for age and gender(OR=8.30,5.17,1.11,2.28,respectively;all P<0.05).HF incidence in individuals aged≥65 years were 847 per 100,000 *** atrial fibrillation,valvular heart disease,and diabetes mellitus were risk factors for HF incidence for individuals aged≥65 years adjusting for age and gender(OR=5.05,3.99,2.11,respectively;all P<0.05).Besides,residents with new-onset atrial fibrillation and myocardial infarction were at significantly higher risk of progression to HF(OR=14.41,8.54,respectively;all P<0.05).CONCLUSIONS Both pre-existing and new-onset cardiovascular diseases were associated with HF incidence in southern *** of related cardiovascular diseases may be helpful to reduce the incidence of HF.

关键词： prevalence cardiovascular incidence

在线全文

学校读者我要写书评

暂无评论

基于AI图像分析的铸造原砂粒度粒形检测法

铸造 2024年第4期73卷 520-526页

作者：李贝贝郭树人曹华堂刘鑫旺董选普张宇辉钟飞升吴执成华中科技大学材料科学与工程学院材料成形与模具技术全国重点实验室湖北武汉430074 辽宁联信铸砂投资集团有限公司辽宁沈阳110000

铸造原砂的粒形和粒度分布是原砂生产和使用过程中的重要衡量指标。针对筛分法存在的测量效率和测量误差问题,本文提出一种基于人工智能(Artificial Intelligence:AI)图像分析的铸造原砂粒度粒形测试方法,即采用工业相机采集原砂图像,通... 详细信息

铸造原砂的粒形和粒度分布是原砂生产和使用过程中的重要衡量指标。针对筛分法存在的测量效率和测量误差问题,本文提出一种基于人工智能(Artificial Intelligence:AI)图像分析的铸造原砂粒度粒形测试方法,即采用工业相机采集原砂图像,通过AI图像处理技术对图像进行实例分割,然后对图像进行特征提取,统计出原砂的粒度分布和粒形分布。研究结果表明:基于AI技术的BlendMask实例分割模型能有效地分离粘连砂粒;采用圆形度、形状因子和方形度三个特征参数对原砂粒形进行K-means聚类,能够准确分析砂粒的粒形特征;采用等效椭圆法、面积占比等效质量占比法,可准确测得烘焙砂、烘干砂和宝珠砂三种铸造原砂的粒度分布,满足行业精度要求。

关键词：铸造原砂粒度分布粒形图像法实例分割深度学习

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

火力发电企业集中供冷站建设

节能 2024年第5期43卷 111-113页

作者：邓毅琨普飞高明刘双臣赵虎军段丽国能开远发电有限公司云南开远661601 国能龙源蓝天节能技术有限公司北京100039

西南某火电厂通过调研周边食品加工企业的冷库用冷需求提出集中供冷方案。将制冷装置的压缩机和其他辅助设备集中放置于厂内独立的专用机房,建设集中供冷站,利用间接制冷循环系统,通过载冷剂将冷负荷送至分散的各个冷用户。研究表明,集... 详细信息

西南某火电厂通过调研周边食品加工企业的冷库用冷需求提出集中供冷方案。将制冷装置的压缩机和其他辅助设备集中放置于厂内独立的专用机房,建设集中供冷站,利用间接制冷循环系统,通过载冷剂将冷负荷送至分散的各个冷用户。研究表明,集中供冷站可以实现自动控制、远程监控功能,具有厂用电成本优势,减少了用户设备投资及维护成本的吸引力。

关键词：火电厂集中供冷站间接制冷载冷剂