检索结果-南通市图书馆

An SPH Framework for Earthquake-Induced Liquefaction Hazard Assessment of geotechnical Structures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2025年第1期142卷 251-277页

作者： Sourabh Mhaski g.V.Ramana Department of Civil Engineering Indian Institute of Technology DelhiNew Delhi110016India

Earthquake-induced soil liquefaction poses significant risks to the stability of geotechnical structures *** understanding of the liquefaction triggering,and the post-failure large deformation behaviour is essential for designing resilient *** present study develops a Smoothed Particle Hydrodynamics(SPH)framework for earthquake-induced liquefaction hazard assessment of geotechnical *** coupled flowdeformation behaviour of soils subjected to cyclic loading is described using the PM4Sand model implemented in a three-phase,single-layer SPH framework.A staggered discretisation scheme based on the stress particle SPH approach is adopted to minimise numerical inaccuracies caused by zero-energy modes and tensile ***,non-reflecting boundary conditions for seismic analysis of semi-infinite soil domains using the SPH method are *** numerical framework is employed for the analysis of cyclic direct simple shear test,seismic analysis of a level ground site,and liquefaction-induced failure of the Lower San Fernando *** agreement for liquefaction triggering and post-failure behaviour demonstrates that the SPH framework can be utilised to assess the effect of seismic loading on field-scale geotechnical *** present study also serves as the basis for future advancements of the SPH method for applications related to earthquake geotechnical engineering.

关键词： Earthquake seismic liquefaction stress particle PM4Sand smoothed particle hydrodynamics(SPH)

Stepping up after spinal cord injury:negotiating an obstacle during walking

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 1919-1929页

作者： Alain Frigon Charly g.Lecomte Department of Pharmacology-Physiology Faculty of Medicine and Health SciencesUniversitéde SherbrookeCentre de recherche du Centre Hospitalier Universitaire de SherbrookeSherbrookeQCCanada

Every day walking consists of frequent voluntary modifications in the gait pattern to negotiate *** spinal cord injury,stepping over an obstacle becomes *** over an obstacle requires sensorimotor transformations in several structures of the brain,including the parietal cortex,premotor cortex,and motor *** information and planning are transformed into motor commands,which are sent from the motor cortex to spinal neuronal circuits to alter limb trajectory,coordinate the limbs,and maintain *** spinal cord injury,bidirectional communication between the brain and spinal cord is disrupted and animals,including humans,fail to voluntarily modify limb trajectory to step over an ***,in this review,we discuss the neuromechanical control of stepping over an obstacle,why it fails after spinal cord injury,and how it recovers to a certain extent.

关键词： biomechanics locomotion neurophysiology obstacle negotiation spinal cord injury

THE MEANINg OF FROZEN TOKENS IN LIVE NETS

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 1989年第4期32卷 459-469页

作者：陆维明 A.merceron Institute of Mathematics Academia SinicaBeijing Laboratoire de Recherche en Informatique University Paris-sud91405 Orsay CedexFrance

A concurrent system can be modeled by a Petri net. A live Petri net may have fro-zen tokens. It is showed that such tokens can be deleted if they are superfluous, and, whilethey are useful, can be defrozen if they bec... 详细信息

关键词： frozen token live net unfair occurrence.

Bioelectronic medicine in modulation of cortical spreading depolarization and beyond

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 481-482页

作者： Khaled Alok Timothy g.White Chunyan Li Department of Neurosurgery Donald and Barbara Zucker School of Medicine at Hofstra/NorthwellHempsteadNYUSA Translational Brain Research Laboratory The Feinstein Institutes for Medical ResearchManhassetNYUSA

Bioelectronic interventions,specifically trigeminal nerve st imulat ion(TNS),have attracted considerable attention in conditions where cortical spreading depolarizations(CSDs)accompanied by compromised cerebral perfusion may exacerbate neurological *** pharmacological interventions have demonstrated initial potential in addressing CSDs,a standardized treatment approach has not yet been *** objective of this perspective is to explore emerging bioelectronic methodologies for addressing CSDs,particularly emphasizing TNS,and to underscore TNS’s capacity to enhance neurovascular coupling and cerebral perfusion.

关键词： cerebral perfusion electronic

Impact of Zika virus non-structural protein mutations on hippocampal damage

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第8期20卷 2307-2308页

作者： Larissa M.g.Cassiano Roney S.Coimbra Neurogenômica/Imunopatologia Instituto RenéRachouFiocruzBelo HorizonteBrazil Departamento de Bioquímica e Imunologia Instituto de Ciências BiológicasUniversidade Federal de Minas GeraisBelo HorizonteBrazil

The Zika virus(ZIKV),a member of the Flaviviridae family,attracted worldwide attention for its connection to severe neurological effects,notably microcephaly in newborns,first reported during the 2015 epidemic in ***,its impact goes beyond fetal and neonatal abnormalities,also affecting the central nervous system(CNS)in both children and adults,leading to enduring cognitive and behavioral impairments.

关键词： damage fetal neonatal

在线全文

学校读者我要写书评

暂无评论

神经电极-脑组织界面微动环境力学特性仿真

浙江大学学报（工学版） 2013年第2期47卷 256-260,307页

作者：吴栋栋张文光 merceron gilles 罗云上海交通大学机械系统与振动国家重点实验室上海200240 法国国立高等技术学院法国

为了解决电极的长期寿命问题,采用有限元方法对电极-脑组织界面的微动进行静态分析和瞬态分析,基于商用电极A1x16-3-100-413进行建模,研究微动频率f和电极界面黏附状态对电极-脑组织界面力学状态的影响.结果表明,f对等效应力σ最大值有... 详细信息

为了解决电极的长期寿命问题,采用有限元方法对电极-脑组织界面的微动进行静态分析和瞬态分析,基于商用电极A1x16-3-100-413进行建模,研究微动频率f和电极界面黏附状态对电极-脑组织界面力学状态的影响.结果表明,f对等效应力σ最大值有显著影响,高频率比低频率更不利于电极的长期稳定性,且存在临界值;f在20Hz左右时σ接近最大值,超过20Hz后f的影响减小;电极与脑组织之间的物理耦合度对界面力学状态有较大影响,增强电极和脑组织的黏附程度,可以有效减小微电极尖端和神经组织间的应力、应变以及分层,从而提高电极使用寿命.

关键词：微电极有限元法微动物理耦合度

Present status and future directions:Apexification

在线全文

学校读者我要写书评

暂无评论

World Journal of Methodology 2025年第1期15卷 26-32页

作者： Sachin Chauhan Radha Chauhan Prashant Bhasin Bhavna g Sharaf Department of Conservative Dentistry and Endodontics Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002HaryanaIndia Department of Prosthodontics and Crown and Bridge and Oral Implantology Mahatma Gandhi Dental College&HospitalJaipur 302022RajasthanIndia Department of Pedodontics and Preventive Dentistry Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002HaryanaIndia

The success rate of apexification is primarily determined by multiple factors,including the material used,the size of the open apex compared to the length of the root,and the technique used in each *** main objective of this review was to provide an update on the present management of open apex to identify factors and circumstances that may influence the success of apexification using different materials and *** research on apexification should focus on how to treat open apices with wide periapical lesions without ***,the predictability of these parameters with non-surgical procedures was uncertain,but now,with the use of a dental operating microscope,it has become more *** reason could be that extra visits are no longer required due to major advances in the armamentarium and materials used for apexification.

关键词： Bioceramics Magnification Biodentine Mineral trioxide aggregate Apexification Open apex

Advancement in utilization of magnetic resonance imaging and biomarkers in the understanding of schizophrenia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第1期13卷 11-15页

作者： Aidan K Tirpack Danyaal g Buttar Mandeep Kaur Department of Psychiatry Campbell University School of Osteopathic MedicineBuies CreekNC 27506United States Department of Psychiatry and Behavioral Health Mercyhealth Hospital and Trauma CenterJanesvilleWI 53548United States

Historically,psychiatric diagnoses have been made based on patient’s reported symptoms applying the criteria from diagnostic and statistical manual of mental *** utilization of neuroimaging or biomarkers to make the diagnosis and manage psychiatric disorders remains a distant *** have been several studies that examine brain imaging in psychiatric disorders,but more work is needed to elucidate the complexities of the human *** this editorial,we examine two articles by Xu et al and Stoyanov et al,that show developments in the direction of using neuroimaging to examine the brains of people with schizo-phrenia and *** et al used magnetic resonance imaging to examine the brain structure of patients with schizophrenia,in addition to examining neurotransmitter levels as *** et al used functional magnetic resonance imaging to look at modulation of different neural circuits by diagnostic-specific scales in patients with schizophrenia and *** two studies provide crucial evidence in advancing our understanding of the brain in prevalent psychiatric disorders.

关键词： Schizophrenia Magnetic resonance imaging Biomarkers Neurotransmitters Psychiatric disorders

Hypoxia-inducible factor 2α is a negative regulator of osteoblastogenesis and bone mass accrual

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bone Research 2019年第1期7卷 91-104页

作者： Christophe merceron Kavitha Ranganathan Elizabeth Wang Zachary Tata Shreya Makkapati Mohd Parvez Khan Laura Mangiavini Angela Qing Yao Laura Castellini Benjamin Levi Amato J.giaccia Ernestina Schipani Department of Orthopaedic Surgery School of MedicineUniversity of MichiganAnn ArborMIUSA Division of Plastic and Reconstructive Surgery Department of SurgeryUniversity of MichiganAnn ArborMIUSA Department of Radiation Oncology Stanford University Medical SchoolStanfordCAUSA

Osteoblasts,which are the bone-forming cells,operate in a hypoxic *** transcription factors hypoxia-inducible factor-1α(HIF1)and HIF2 are key mediators of the cellular response to *** are expressed in ***1 is known to be a positive regulator of bone ***,the role of HIF2 in the control osteoblast biology is still poorly *** this study,we used mouse genetics to demonstrate that HIF2 is an inhibitor of osteoblastogenesis and bone mass ***,we provided evidence that HIF2 impairs osteoblast differentiation at least in part,by upregulating the transcription factor *** findings constitute a paradigm shift,as activation of the hypoxia-signaling pathway has traditionally been associated with increased bone formation through *** HIF2 could thus represent a therapeutic approach for the treatment of the low bone mass observed in chronic diseases,osteoporosis,or aging.

关键词： is cells has