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工具钢高温形变热处理的可能性

兵器材料科学与工程 1985年第Z1期 128-130页

作者： g.lehmann 薛彩绵

一、工具钢形变热处理可达到的性能和主要参数与常规热处理相比,结构钢、弹簧钢和调质钢通过高温形变热处理所达到的性能变化特点是,在韧性和塑性不变或在两者均有改善的情况下,强度获得提高。在上述这些钢的高温形变热处理基础上,近... 详细信息

一、工具钢形变热处理可达到的性能和主要参数与常规热处理相比,结构钢、弹簧钢和调质钢通过高温形变热处理所达到的性能变化特点是,在韧性和塑性不变或在两者均有改善的情况下,强度获得提高。在上述这些钢的高温形变热处理基础上,近年来对高合金钢也做了一些研究。由于高温形变热处理的采用,从而有可能使工具钢、热作模具钢、高速切削钢的使用性能(即强度、韧性、

关键词：高温形变热处理热作模具钢锻造淬火工具钢高速切削钢

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

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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

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

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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)

Bioelectronic medicine in modulation of cortical spreading depolarization and beyond

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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

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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

Chunyun versus lockdown

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National Science Review 2022年第1期9卷 7-8页

作者： Sune lehmann Center for Social Data Science University of Copenhagen DTU Compute Technical University of Denmark

Across the world, the news of COVID-19 was followed by ‘lockdowns’ that limited societal activity and mobility to a greater or lesser degree. In China, however, the situation was unique because the travel lockdown occurred in the middle of the year’s most hectic travel season occurring around Chinese Lunar New Year(chunyun).

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Advanced approaches to high precision MEMS metrology based on interferometric,confocal,and tactile techniques

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Optoelectronics Letters 2008年第2期4卷 143-146页

作者： Peter lehmann Mahr gmbH 37073 Goettingen Germany

geometrical features of micro-systems can be determined by either tactile or optical profiling techniques, which show different non-linear transfer characteristics. This has to be considered especially, if the instruments operate close to their physical limitations. Depending on the specific measuring task either point-wise or areal optical measurement may be advantageous. Hence, examples for both approaches are discussed. Furthermore, systematic effects, which are related to the measuring principle have to be taken into account, e.g. if sharp edges or slopes are present on the measuring object. As it is shown, for white-light interferometry these difficulties can be solved by a two-wavelength technique.

关键词：精密度 MEMS 计量方法干涉测量触摸技术

CONVERSATION WITH THE ENgINEER: BEYOND gREEN BUILDINgS-ENTERINg THE ECOLOgICAL AgE

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Journal of green Building 2010年第3期5卷 43-49页

作者： Steffen lehmann Peter Head University of South Australia Arup

Arup,the global design,engineering,and business consultancy,is the creative force behind many of the world’s most innovative and sustainable buildings and transport and civil engineering *** over 60 years ago,Arup has operated in China for more than three decades,and almost a quarter of their worldwide staff of 9,000 is based in Hong Kong and *** was initially commissioned by the Shanghai Industrial Investment Corporation in 2006 to put forward concept proposals for a new sustainable city:Wanzhuang Eco-City,located in Hebei *** for the 80 sq km site are now being guided by a Development Strategy,the Preliminary Control Plan and Sustainability Design *** engineer Peter Head has been a director at Arup since 2004 and is based in *** is chairman of global planning and leads the company’s planning and integrated urbanism business,which includes development planning,economics and policy,integrated urbanism,transport and environmental consulting and sustainable devel*** his early career,Peter worked at the forefront of steel bridge technology,and in 1998 he was awarded an OBE for his services to bridge *** is also chairman of the Steel Construction *** was appointed a Commissioner on the London Sustainable Development Commission in 2002,representing the construction ***,he was a member of the group that drafted the Sustainable Development Framework for London,which led an initiative to create a voluntary code of practice for sustainable planning,design,and construction of London’s built *** the last decade or so,Peter has been dedicated to overthrowing the notion that urbanization is inevitably the fast track to environmental ***,he is fighting to ensure that a growing number of the world’s mega cities,and the associated mega projects,embrace sustainability principles from the out*** 2004 to 2008 he was project director for the Dongtan Eco-City

关键词： ecological age rapid urbanization China decarbonizing energy supply

Therapeutic potential of glial cell line-derived neurotrophic factor and cell reprogramming for hippocampal-related neurological disorders

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Neural Regeneration Research 2022年第3期17卷 469-476页

作者： Priscila Chiavellini Martina Canatelli-Mallat Marianne lehmann Rodolfo g.goya gustavo R.Morel Biochemistry Research Institute of La Plata(INIBIOLP)-Histology and Embryology B School of Medical SciencesNational University of La Plata(UNLP)La PlataBuenos AiresArgentina

Hippocampus serves as a pivotal role in cognitive and emotional processes,as well as in the regulation of the hypothalamus-pituitary *** is known to undergo mild neurodegenerative changes during normal aging and severe atrophy in Alzheimer's ***,dysregulation in the hippocampal function leads to epilepsy and mood *** the first section,we summarized the most salient knowledge on the role of glial cell-line-derived neurotrophic factor and its receptors focused on aging,cognition and neurodegenerative and hippocampal-related neurological diseases mentioned *** the second section,we reviewed the therapeutic approaches,particularly gene therapy,using glial cell-line-derived neurotrophic factor or its gene,as a key molecule in the development of neurological *** the third section,we pointed at the potential of regenerative medicine,as an emerging and less explored strategy for the treatment of hippocampal *** briefly reviewed the use of partial reprogramming to restore brain functions,non-neuronal cell reprogramming to generate neural stem cells,and neural progenitor cells as source-specific neuronal types to be implanted in animal models of specific neurodegenerative disorders.

关键词： aging Alzheimer's disease cell reprogramming epilepsy gene therapy glial cell line-derived neurotrophic factor hippocampus major depression