检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

战争论

Ground motion spatial variability effects on seismic response control of cable-stayed bridges

作者： (普鲁士)卡尔·冯·克劳塞维茨(Carl von Clausewitz)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

earthquake engineering and engineering Vibration 2011年第1期10卷 37-49页

作者： Shehata e. Abdel Raheem Toshiro Hayashikawa Uwe Dorka Civil engineering Department Faculty of Engineering Assiut University Bridge and Structural Design engineering Hokkaido University Steel & Composite Structures Kassel Universitt

The spatial variability of input ground motion at supporting foundations plays a key role in the structural response of cable-stayed bridges （CSBs）; therefore, spatial variation effects should be included in the analysis and design of effective vibration control systems. The control of CSBs represents a challenging and unique problem, with many complexities in modeling, control design and implementation, since the control system should be designed not only to mitigate the dynamic component of the structural response but also to counteract the effects of the pseudo-static component of the response. The spatial variability effects on the feasibility and efficiency of seismic control systems for the vibration control of CSBs are investigated in this paper. The assumption of uniform earthquake motion along the entire bridge may result in quantitative and qualitative differences in seismic response as compared with those produced by uniform motion at all supports. A systematic comparison of passive and active system performance in reducing the structural responses is performed, focusing on the effect of the spatially varying earthquake ground motion on the seismic response of a benchmark CSB model with different control strategies, and demonstrates the importance of accounting for the spatial variability of excitations.

关键词： cable-stayed bridge vibration control earthquake spatial variation seismic design semi-active control

维普期刊数据库

Finite cell method compared to h-version finite element method for elasto-plastic problems

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(english edition) 2014年第10期35卷 1239-1248页

作者： A.ABeDIAN J.PARVIZIAN A.DSTeR e.RANK Department of Mechanical engineering Daneshpajoohan Higher Education Institute Department of Mechanical engineering Isfahan University of Technology Numerische Strukturanalyse mit Anwendungen in der Schiffstechnik (M-10) Technische Universitt Hamburg-Harburg Lehrstuhl fr Computation in engineering Fakultt fr Bauingenieur-und Vermessungswesen Technische Universitt Mnchen

The finite cell method （FCM） combines the high-order finite element method （FeM） with the fictitious domain approach for the purpose of simple meshing. In the present study, the FCM is used to the Prandtl-Reuss flow theory of plasticity, and the results are compared with the h-version finite element method （h-FeM）. The numerical results show that the FCM is more efficient compared to the h-FeM for elasto-plastic problems, although the mesh does not conform to the boundary. It is also demonstrated that the FCM performs well for elasto-plastic loading and unloading.

关键词： finite cell method (FCM) h-version finite element method (h-FeM),Prandtl-Reuss quadtree octree

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

乳房磁共振体层摄影术初步临床结果

放射学实践 1986年第3期 110-114页

作者： von W.Kaiser ,e.Zeitler ,吴亚群同济医科大学附属同济医院

乳腺良、恶性肿瘤是妇女最常见疾病,几乎发生于1/2女性.因而以简单、无损伤的方法尽可能早期确诊有重要意义.目前采用的检查方法(乳房X线摄片、超声波图象、热像图等)的诊断率——根据肿瘤分期与检查方法而异——在20%～96%之间. 本文... 详细信息

乳腺良、恶性肿瘤是妇女最常见疾病,几乎发生于1/2女性.因而以简单、无损伤的方法尽可能早期确诊有重要意义.目前采用的检查方法(乳房X线摄片、超声波图象、热像图等)的诊断率——根据肿瘤分期与检查方法而异——在20%～96%之间. 本文报告临床首次运用乳房磁共振体层摄影术(MR)28例,并与其他检查方法对照.分析MR的优、缺点.

关键词：磁共振体层摄影术自旋粒子性质回波时间图象表面线圈信号区乳房

effect of acetyl-L-carnitine on hypersensitivity in acute recurrent caerulein-induced pancreatitis and microglial activation along the brain’s pain circuitry

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第9期27卷 794-814页

作者： Sabrina L McIlwrath Marlene e Starr Abigail e High Hiroshi Saito Karin N Westlund Research Service New Mexico Veterans Affairs Healthcare SystemAlbuquerqueNM 87108United States Department of Surgery University of KentuckyLexingtonKY 40536United States College of Liberal Arts University of TexasAustinTX 78712United States Department of Anesthesiology and Critical Care Medicine University of New Mexico Health Sciences CenterAlbuquerqueNM 87131United States

BACKGROUND Acute pancreatitis(AP)and recurring AP are serious health care problems causing excruciating pain and potentially lethal outcomes due to *** validated caerulein-(CAe)induced mouse model of acute/recurring AP produces secondary persistent hypersensitivity and anxiety-like behavioral changes for *** To determine efficacy of acetyl-L-carnitine(ALC)to reduce pain-related behaviors and brain microglial activation along the pain circuitry in *** Pancreatitis was induced with 6 hly intraperitoneal(i.p.)injections of CAe(50μg/kg),3 d a week for 6 wk in male C57BL/6J *** in week 4,mice received either vehicle or ALC until experiment’s *** hypersensitivity was assessed with von Frey *** hypersensitivity was determined with the hotplate ***-like behavior was tested in week 6 using elevated plus maze and open field *** activation in brain was quantified histologically by immunostaining for ionized calcium-binding adaptor molecule 1(Iba1).ReSULTS Mice with CAe-induced pancreatitis had significantly reduced mechanical withdrawal thresholds and heat response latencies,indicating ongoing *** with ALC attenuated inflammation-induced hypersensitivity,but hypersensitivity due to abdominal wall injury caused by repeated intraperitoneal injections *** with pancreatitis displayed spontaneous anxiety-like behavior in the elevated plus maze compared to *** with ALC resulted in increased numbers of rearing activity events,but time spent in“safety”was not *** all the abdominal injections,pancreata were translucent if excised at experiment’s end and opaque if excised on the subsequent day,indicative of spontaneous *** mortem histopathological analysis performed on pancreas sections stained with Sirius Red and Fast Green identified wide-spread fibrosis and acinar cell atrophy in sections from mice with CAe-induced pancreatitis that was no

关键词： Acute recurrent pancreatitis Neuropathic pain Mechanical hypersensitivity Heat hypersensitivity Anxiety-like behavior Ionized calcium-binding adaptor molecule 1

Ancient,highly heterogeneous mantle beneath Gakkel ridge,Arctic Ocean

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

Ancient,highly heterogeneous mantle beneath Gakkel ridge,Arc...

Psychosocial mechanisms for the transmission of somatic symptoms from parents to children

中国科学院地质与地球物理研究所2008学术年会

作者： Jonathan e.Snow eric Hellebrand Gerhard Brügmann Anette von der Handt Anette Büchl Albrecht W.Hofmann Max-Planck Institut für Chemie Abteilung GeochemieMainz55020Germany Department of Geosciences University of HoustonHoustonTexas 77204USA. Max-Planck Institut für Chemie Abteilung GeochemieMainz55020Germany.

The earth’s mantle beneath ocean ridges is widely thought to be depleted by previous melt extraction;but well homogenized by convective *** inference of homogeneity has been complicated by the occurrence of portions enriched in incompatible *** we show that some refractory abyssal peridotites from the ultraslow-spreading Gakkel ridge (Arctic Ocean) have very depleted Os/Os ratios with model ages up to 2 billion years;implying the long-term preservation of refractory domains in the asthenospheric mantle rather than their erasure by mantle *** refractory domains would not be sampled by mid-ocean-ridge basalts because they contribute little to the genesis of *** thus suggest that the upwelling mantle beneath mid-ocean ridges is highly heterogeneous;which makes it difficult to constrain its composition by mid-ocean-ridge basalts ***;the existence of ancient domains in oceanic mantle suggests that using osmium model ages to constrain the evolution of continental lithosphere should be approached with caution.

关键词：

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 2015年第18期21卷 5532-5541页

作者： Miranda AL van Tilburg Rona L Levy Lynn S Walker Michael von Korff Lauren D Feld Michelle Garner Andrew D Feld William e Whitehead Center for Functional GI and Motility Disorders University of North Carolina School of Social Work University of Washington Department of Pediatrics Vanderbilt University School of Medicine Nashville TN 37201 United States Group Health Research Institute Mount Sinai School of Medicine Department of Social Work University of Washington Tacoma Group Health Cooperative

AIM: To examine familial aggregation of irritable bowel syndrome(IBS) via parental reinforcement/modeling of symptoms, coping, psychological distress, and exposure to ***:Mothers of children between the ages of8 and 15 years with and without IBS were identified through the Group Health Cooperative of Puget *** completed questionnaires,including the Child Behavior Checklist(child psychological distress),the Family Inventory of Life events(family exposure to stress),SCL-90R(mother psychological distress),and the Pain Response Inventory(beliefs about pain).Children were interviewed separately from their parents and completed the Pain Beliefs Questionnaire(beliefs about pain),Pain Response Inventory(coping)and Child Symptom Checklist[gastrointestinal(GI)symptoms].In addition,health care utilization data was obtained from the automated database of Group Health *** with IBS(n=207)and their 296 children were compared to 240 control mothers and their 335 children,while controlling for age and ***:Hypothesis 1:reinforcement of expression of GI problems is only related to GI symptoms,but not others(cold symptoms)in *** was no significant correlation between parental reinforcement of symptoms and child expression of GI or other *** 2:modeling of GI symptomsis related to GI but not non-GI symptom reporting in *** of parents with IBS reported more non-GI(8.97 vs 6.70,Pell as more GI(3.24 vs 2.27,Pealth care visits made by the mother correlated with visits made by the child(rho=0.35,Pes,rho=0.26,Pesis 3:children learn to share the methods of coping with illness that their mothers *** used by children to cope with stomachaches differed from methods used by their *** 2/16 scales showed weak but significant correlations(stoicism rho=0.13,Peptance rho=0.13,Pesis 4:mothers and chi

关键词： Abdominal pain Coping Illness behaviors Psychological distress Social learning Stress

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

腭发育和腭裂形成中的局部调控因子

北京大学学报（医学版） 2009年第1期41卷 1-5页

作者：孟柳燕 J．W．von den Hoff 边专武汉大学口腔医学院口腔生物医学工程教育部重点实验室武汉430079 Department of Orthodontics and Oral Biology Radboud University Nijmegen Medical CentreThe Netherlands

唇腭裂是胚胎时期上皮和/或间充质发育受阻而导致的一组出生缺陷,全球发生率为1∶1 000至1∶500。根据是否伴有其他组织器官缺陷,唇腭裂可分为综合征型和非综合征型,其中70%为非综合征型。唇腭裂的病因复杂,与多种基因和环境因素等有关... 详细信息

唇腭裂是胚胎时期上皮和/或间充质发育受阻而导致的一组出生缺陷,全球发生率为1∶1 000至1∶500。根据是否伴有其他组织器官缺陷,唇腭裂可分为综合征型和非综合征型,其中70%为非综合征型。唇腭裂的病因复杂,与多种基因和环境因素等有关。唇裂和腭裂可单独发生,亦可合并发生为唇腭裂。一般认为唇裂伴或不伴腭裂与单纯性腭裂具有不同的致病机制,然而,导致唇裂和/或腭裂的生物学机制可能有一定的相似性。多项研究报道了唇裂和/或腭裂中的大量相关因子,但是,因为腭裂具有更重要的临床意义(如腭裂患者存在发音和吞咽问题,患儿术后腭部瘢痕形成易导致颌面部发育异常等),而且腭裂动物模型的建立为探索致病机制奠定了坚实的基础,所以,本文主要探讨在腭发育和腭裂形成中局部调控因子的作用。1腭发育腭组织来源于胚胎中鼻突和上颌突。人胚胎第6周早期(鼠胚第12天,e12),双侧腭板从上颌突内侧垂直方向生长,位于舌的两侧[2]。胚胎第8周(e13·5),由于下颌发育,舌位置下降,腭板水平方向转动并向中线生长。胚胎第9周(e14),左右侧腭板对向生长,通过腭中嵴上皮表面分泌的糖蛋白膜及合成的桥粒结构相黏附,形成腭中缝。

关键词：腭裂转化生长因子β 细胞外基质细胞黏附分子

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

13C核磁共振（五）

有机化学 1981年第1期 61-72页

作者： von e.Breitmaier G.Bauer 陆仁荣王绮文

习题1 分子式为C4H10S的哪一个化合物符合图e-1的13C谱?对此谱作出归属。取谱条件: 溶剂:CDCl3（δ77.25处有三重峰,图中未画出）浓度:50V/V％温度:28℃测定频率:22.63MHz 去偶:上——1H偏共振去偶（200次）下——1H宽带去偶（100次）

关键词：宽带去偶 MHz 溶剂三重峰核磁共振核自旋共振远程偶合偏共振去偶位移常数甲基乙烯酮谱条件偶合常数