检索结果-南通市图书馆

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国西南地区纽马克位移新的评估模型

世界地震译丛 2019年第5期50卷 481-500页

作者： Jin J.-L Wang y Gao D yuan R.-m.y.ng X.-y 金家梁(译) 袁仁茂(校) 不详中国城市科学规划设计研究院中国地震局地质研究所

本文作者旨在建立适用于中国西南地区同震位移的纽马克(Newmark)位移模型,该区域内发生过2008年汶川地震、2013年芦山地震,以及2017年九寨沟地震。基于2008年汶川mW7.9地震期间的33条强震动数据记录,作者对其中的纽马克位移值(Dn),临界... 详细信息

本文作者旨在建立适用于中国西南地区同震位移的纽马克(Newmark)位移模型,该区域内发生过2008年汶川地震、2013年芦山地震,以及2017年九寨沟地震。基于2008年汶川mW7.9地震期间的33条强震动数据记录,作者对其中的纽马克位移值(Dn),临界加速度(Ac)和阿里亚斯强度(IA)进行了相关性分析,并根据吉布森(Jibson)模型及其演化模型的参数形态,拟合了新的参数,使模型适用于中国西南地区。结果表明:利用新拟合参数的模型具有较高的拟合优度和较小的评估误差。然后,利用2013年mW6.6芦山地震的强震动数据对这些模型评估结果进行验证,证实了具有新拟合参数的模型适用于中国西南地区,并通过对比分析选择出了具有最小评估误差和最大拟合优度的新参数模型:logDn=0.465logIA+12.896AclogIA-22.201Ac+2.092±0.148(R^2=0.92),该模型可用于未来中国西南地区的灾害评估。最后,利用该模型对2017年九寨沟mS7.0地震引发的滑坡灾害进行了评估,评估结果与野外调查结果基本一致,显示本文建议的新拟合参数模型应用于中国西南地区地震灾害危险性评估的有效性。本文研究结果还表明:全球评估模型需要根据特定区域的地震地质条件重新拟合模型参数,以获得更好的评估结果。

关键词：中国西南地区评估模型位移模型汶川地震拟合优度拟合参数地震地质条件相关性分析

维普期刊数据库

Preparation and Characterization of Polyurethane Foams from Biomass-Based Polyols Obtained by microwave-Assistant Liquefaction of Wood

在线全文

学校读者我要写书评

暂无评论

Preparation and Characterization of Polyurethane Foams from ...

Improving outcomes in pancreatic cancer: Key points in perioperative management

第二届中国林业学术大会——S11木材及生物质资源高效...

作者：郑志锋 Chung y.hse Key Laboratory of Protection Cultivation and Utilization of Forest Resource in Southwest Country Cooperated by Ministry of Education with Yunnan ProvinceSouthwest Forestry University Southern Research Station USDA Forest ServicePinevilleLouisiana 71360USA

Polyurethane foams were prepared from the liquefied wood polyols, which was obtained by the liquefaction of southern pine wood in the presence of polyhydric alcohols using microwave-assistant as an energy source. The effects of acid type （sulfuric acid and phosphoric acid） and liquefaction reaction time on the properties of liquefied biomass-based polyols were investigated. The influences of isocyanate index on the properties of polyurethane foams were also discussed, and feasible formulations for preparing liquefied biomass-based polyurethane foams were proposed. The results indicated that the foams prepared from such liquefied wood polyols obtained by microwave-assistant liquefaction exhibited excellent mechanical properties.

关键词： polyurethane foam liquefaction microwave southern pine mechanical properties

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第39期20卷 14237-14245页

作者： José m álamo Luis m marín Gonzalo Suarez Carmen Bernal Juan Serrano Lydia Barrera miguel A Gómez Jordi muntané Francisco J Padillo Centro de Investigación Biomédica en Red de Enfermedades hepáticas y Digestivas (CIBEREh o Ciberehd) Instituto de Salud Carlos Ⅲ 28029 Madrid Spain Francisco J Padillo Department of General Surgery Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla 41013 Seville Spain

This review focused in the perioperative management of patients with pancreatic cancer in order to improve the outcome of the disease. We consider that the most controversial points in pancreatic cancer management are jaundice management, vascular resection and neo-adjuvant therapy. Preoperative biliary drainage is recommended only in patients with severe jaundice, as it can lead to infectious cholangitis, pancreatitis and delay in resection, which can lead to tumor progression. The development of a phase III clinical trial is mandatory to clarify the role of neo-adjuvant radiochemotherapy in pancreatic adenocarcinoma. Venous resection does not adversely affect postoperative mortality and morbidity, therefore, the need for venous resection should not be a contraindication to surgical resection in selected patients. The data on arterial resection alone, or combined with vascular resection at the time of pancreatectomy are more heterogeneous, thus, patient age and comorbidity should be evaluated before a decision on operability is made. In patients undergoing R0 resection, arterial resection can also be performed.

关键词： Pancreatic cancer Obstructive jaundice Preoperative drainage Neo-adjuvant therapy Vascular resection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

AA7005铝合金抗应力腐蚀制程之研究

金属热处理 2005年第C期30卷 8-12页

作者：吴翼贻黄清添林昆民台湾科技大学中国台北

本研究系针对AA7005铝合金（T73＆RRA）制程所需之抗应力腐蚀时效温度与时间进行探讨，期能找出适用于AA7005铝合金之T73及RRA热处理制程参数组合。实验结果显示，最佳T73热处理制程参数组合为470℃／40min＋自然时效／18天＋107℃／8h... 详细信息

本研究系针对AA7005铝合金（T73＆RRA）制程所需之抗应力腐蚀时效温度与时间进行探讨，期能找出适用于AA7005铝合金之T73及RRA热处理制程参数组合。实验结果显示，最佳T73热处理制程参数组合为470℃／40min＋自然时效／18天＋107℃／8hr．＋168℃／19hr．。RRA热处理制程参数组合为470℃／40min＋自然时效／18天＋120℃／42hr．＋180℃／1hr．40min＋120℃／42hr。经退化处理参数组合之RRA热处理试片除具可满足T6炼度之强度要求，并拥有近似T73之的抗应力腐蚀性。

关键词： AA7005 铝合金挤型材 T73 RRA时效处理

岩性和侵蚀基准面对构造活跃区河流地貌演化的影响——以青藏高原东北缘老虎山和哈思山地区为例

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国科学：地球科学 2021年第6期51卷 994-1008页

作者：李正晨王先彦于洋张会平苏琦苗晓东鹿化煜南京大学地理与海洋科学学院南京210023 中国地震局地质研究所北京100029 临沂大学资源与环境科学学院临沂276000

在构造活跃地区,前人研究着重考虑了构造活动对河流地貌演化的影响,而岩性和局部侵蚀基准面的作用较少被关注.本文以青藏高原东北部海原断裂的影响地区为例,通过对水系形态及地貌特征指数(陡峭指数、河谷宽高比、χ等)的计算等,分析了... 详细信息

在构造活跃地区,前人研究着重考虑了构造活动对河流地貌演化的影响,而岩性和局部侵蚀基准面的作用较少被关注.本文以青藏高原东北部海原断裂的影响地区为例,通过对水系形态及地貌特征指数(陡峭指数、河谷宽高比、χ等)的计算等,分析了裂点发育和水系重组等不同空间尺度下的河流地貌演化过程.结果显示,以老虎山和哈思山为中心,分别发育了两个放射状水系.其中老虎山东南侧支流流向发生了近180°的转变,我们认为这是受局部侵蚀基准面高度的差异(~190m)所诱发的水系重组.部分发源于哈思山的支流发育了受岩性控制下的峡谷-宽谷相间分布的河谷地貌.此外,构造活动和黄河下切引起的局部侵蚀基准面的下降触发了由平行状水系向树枝状水系的正反馈演化过程.这些结果表明,即使在构造活跃地区,岩性和侵蚀基准面变化在地貌演化过程中也扮演着重要角色.

关键词：河流袭夺侵蚀基准面岩性地貌指数海原断裂带青藏高原东北缘

维普期刊数据库

基于mRI的弥漫性胶质瘤分子分型:影像组学和深度学习之间的对比和相关性

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2022年第2期 243-244页

作者： y.m.Li D.Wei X.Liu X.Fan K.Wang S.W.Li 朱能谨

摘要目的弥漫性胶质瘤的分子分型具有重要意义。本研究旨在根据术前多参数mRI建立预测模型。方法回顾性收集北京天坛医院1 016例弥漫性胶质瘤病人的临床资料。

关键词：

A Computational Fluid Dynamics Study on the Endovascular Treatment of Intracranial Aneurysms

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A Computational Fluid Dynamics Study on the Endovascular Tre...

mR成像及mR波谱成像对活体肝移植供肝脂肪变性检测及定量分析准确性的meta分析

The 16th Annual Conference of hong Kong Society of Theoretical and Applied mechanics 2012、The 1st mainland-hong Kong youth Forum on mechanics 2012、The 8th Shanghai-hong Kong Forum on mechanics and Its Application 2012

作者： S.K.Lai Abraham.y.S.Tang K.m.Leung Gilberto K.K.Leung K.W.Chow Department of mechanical Engineering University of Hong Kong Division of Neurosurgery Department of SurgeryLi Ka Shing Faculty of MedicineUniversity of Hong KongQueen Mary Hospital

Intracranial aneurysm,a localized dilation of arterial blood vessels in the brain,is a severe cerebrovascular *** appropriate medical treatment,the rupture of intracranial aneurysms will result in high mortality rate due to excessive bleeding into the cavity surrounding the *** modern technological advances,endovascular stenting technique has now proven to be one effective technique in the clinical management of intracranial *** prime advantage of endovascular intervention over traditional open surgery is that the former procedure is less invasive,and thus a shorter recovery time will *** a mechanical point of view,a metallic stent,serving as a flow diverter,can be deployed to cover the entire aneurysm *** the blood flow inside the aneurysmal sac becomes stagnant,and thrombus formation is likely to *** is expected that a larger extent of thrombosis is capable of reducing the risk of growth and rupture of *** assess this clinical objective quantitatively,we construct a three-dimensional(3D) aneurysm model (see Fig.1) to investigate the blood flow patterns in stented and non-stented *** many idealized models with straight or curved parent blood vessel,the aneurysm of the current model is placed at the bifurcation point of cerebral arteries,a geometric configuration occurring frequently for many *** fluid dynamics techniques are applied to perform the blood flow *** inlet and outlet boundary conditions of this model are subjected to pulsatile velocity and pressure waveforms *** on the present study,the impact of hemodynamic and biomechanical factors on the aneurysm can be *** quantitative findings can also provide valuable information for clinical practitioners to understand and predict the hemodynamic behaviour in patient-specific cases.

关键词： A Computational Fluid Dynamics Study on the Endovascular Treatment of Intracranial Aneurysms

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

国际医学放射学杂志 2017年第2期 207-208页

作者： D.P.Zheng Z.y.Guo P.m.Schroder Z.y.Zheng y.Lu J.C.Gu 蒋宇吴兰 Organ Transplant Center the First Affiliated HospitalSun Yat-Sen University

摘要目的探讨mRI对活体肝移植供肝脂肪变性检测与定量分析的准确性。材料与方法查找mRI对活体肝移植供肝脂肪变性检测与定量分析研究文献并进行系统综述。应

关键词：活体肝移植 mRI 供肝脂肪变性定量分析 mR meta

S2B-2 Comorbidity of Anxiety and Depression Induced by Liang’s Contextual-Stress Box in mice

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

神经药理学报 2018年第4期8卷 44-45页

作者： LIANG Jian-hui LIANG hui ChENG tao LIU Xiao-yan Simon m.y.Lee TANG Ben-qin WANG Xiufen ChEN Feng Andrew J.Lawrence Department of molecular and Cellular Pharmacology School of Pharmaceutical SciencesPeking UniversityBeijing100083China Department of Pharmacology School of Basic Medicine SciencesPeking UniversityBeijing100083China State Key Laboratory of Quality Research in Chinese medicine Institute of Chinese Medical SciencesUniversity of MacaoTaipaMacaoChina The Florey Institute of Neuroscience and mental health University of MelbourneParkvilleVictoria3010Australia

Rationale:Comorbidity of depression and anxiety is one of the most common mental disorders in *** experimental procedures,however,have focused on identifying mixed depression-and anxiety-like behaviors in animal ***:To develop a novel testing paradigm,the so-called Liang’s contextual-stress Box(briefly,Liang’s Box),for evaluating depression-and/or anxiety-like behaviors in ***:Liang’s Box consisted of a central area(CA)with three peripheral arms(PA).mice were placed individually in the end of a peripheral arm facing to the central area and were allowed to travel around Liang’s *** a test period,behavioral parameters were recorded and collected by a video-tracking system named SmART 3.0(Panlab,Spain),including①Latency to CA,②Time spent in CA(CA-time),③Distance traveled in CA(CA-distance),④Distance traveled in PA(PA-distance),⑤Transition number between CA and PA,⑥Global activity,⑦CA-time/cm2,⑧PA-time/cm2,⑨CAdistance/cm2,and⑩PA-distance/*** order to assess the reliability and validity of Liang’s Box and get baseline information,we undertook a series of experiment,including verifying consistency and stability in the various strains of mice(Km,ICR,and C57 BL/6 J mice),imposing high illumination,restraint and tail suspension stress,pre-treating with an anxiolytic(diazepam,buspirone)or antidepressant(desipramine,mianserin).Results:①There were not remarkable differences in all the parameters among Km,ICR,and C57 BL/6 J mice;②high illumination,restraint and tail suspension significantly increased the latency to CA and decreased the CA-time,CA-distance and transition ***,these three types of stresses evoked different effect on global *** illumination increased activity,but restraint stress had no significant *** contrast with high illumination,tail suspension stress markedly reduced activity in mice;③The anxiolytics diazepam(0.25 mg·kg-1 and 0.5 mg·kg-1,i.p.)and buspirone(0.5 mg·kg-1 and 1.0 mg·kg-1,i.p.)

关键词： Depression Anxiety Stress Animal model Comorbidity