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自组织作为一种自发解决困难问题的内部控制过程已被应用在多主体系统中。当这类系统部署在开放环境中,参与主体的改变有可能导致系统走向不理想的状态。因此,知道改变参与主体后系统哪些特性保持不变哪些特性发生变化相当重要。由于验证自组织多主体系统的计算复杂度很高,因此需要思考如何正确使用原系统的验证信息以提高验证新系统的效率。本文提出一个理论框架,用于推理自组织多主体系统由于改变参与主体而带来的动态性。

关键词：多主体系统参与主体动态性验证信息解决困难内部控制过程计算复杂度推理

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维普期刊数据库

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直线电机取代滚珠丝杠?

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软件 2009年第12期30卷 56-56页

作者： john meyer 张翼翔（翻译） Siemens Motion Control Group 不详

最近,有位Control Engineering杂志的读者提问说：＂每当我听到数控铣床系统中预示着滚珠丝杆即将损坏的声音时,就会情不自禁想到,

关键词：滚珠丝杠直线电机滚珠丝杆数控铣床

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Investigation of normal,lateral,and oblique impact of microscale projectiles into unidirectional glass/epoxy composites

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Defence Technology（防务技术） 2022年第11期18卷 1960-1978页

作者： Christopher S.meyer Isabel G.Catugas john W.Gillespie Jr. Bazle Z.Gama Haque University of Delaware Center for Composite Materials(UD-CCM) 101 Academy StreetNewarkDE19716USA

Spacesuits and spacecraft must endure high velocity impacts from micrometeoroids. This work considers the impact of 100 μm diameter projectiles into composite targets at velocities from 0.5 km/s to 2 km/*** work begins by presenting an energy-based theoretical model relating depth of penetration(Do P)and impact force to impact velocity, characteristic time, and threshold velocity and force. Next, this work compares numerical simulations of normal impact on composites to the theoretical model. Numerical simulations are conducted with LS-DYNA and the well-known composite model, MAT-162. The numerical models consider unidirectional S2-glass fiber reinforced SC-15 epoxy composite laminates. The numerical model shows good correlation with the theoretical model. The numerical model also investigates lateral impact, parallel to the fiber direction, and oblique impact at angles from 30°to 82.5°.This work decomposes oblique impact into normal and lateral components, and compares them with normal and lateral impact results. The results show good correlation of the normal component of oblique results with the theoretical model. This numerical and theoretical study focuses on Do P, velocity, and penetration resistance force as functions of time. The theoretical model and numerical simulations are used to determine new Do P parameters: characteristic time of depth of penetration and threshold impact velocity. These models are a first step in developing the capability to predict Do P for oblique,microscale, high-speed impact on composite materials.

关键词： Microscale Hypervelocity impact Composites Erosion Penetration

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Carotid artery endarterectomy in patients with symptomatic non-stenotic carotid artery disease

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Stroke & Vascular Neurology 2022年第3期7卷 251-257页

作者： Valentina Nardi john C Benson Anthony S Larson Waleed Brinjikji Luca Saba Fredric B meyer Giuseppe Lanzino Amir Lerman Luis E Savastano Department of Cardiovascular Diseases Mayo ClinicRochesterMinnesotaUSA Radiology Mayo ClinicRochesterMinnesotaUSA Radiology Azienda Ospedaliero UniversitariaCagliariItaly Neurosurgery Mayo ClinicRochesterMinnesotaUSA

Object We sought to determine the safety and efficacy in secondary stroke prevention of carotid endarterectomy(CEA)in patients with symptomatic non-stenotic carotid artery disease(SyNC).Methods This was a single-centre retrospective case *** patients who underwent CEA for unilateral anterior circulation cerebrovascular events with ipsilateral<50%carotid stenosis from 2002 to 2020 were *** hallmarks including the degree of luminal stenosis and the presence of various vulnerable plaque characteristics(eg,intraplaque haemorrhage(IPH)on MR angiography,ulceration or low-density plaque on CT angiography)were *** presence of vulnerable plaque characteristics was compared between arteries ipsilateral to the ischaemic event and contralateral *** prevalence of perioperative/intraoperative complications,as well as recurrent ischaemic events at follow-up was *** Thirty-two patients were included in the analysis,of which 25.0%were *** arteries ipsilateral to an ischaemic event had a significantly higher prevalence of IPH when compared with contralateral arteries(80.0%vs 0.0%;p<0.001).There were no intraoperative *** patient(3.1%)developed symptoms of transient ipsilateral ischaemia 1 day following CEA which resolved without *** a median follow-up of 18.0 months(IQR 5.0-36.0),only one patient(3.1%)experienced a transient neurologic deficit with complete resolution(annualised rate of recurrent stroke after CEA of 1.5%for a total follow-up of 788 patient-months following CEA).All other patients(31/32,96.9%)were free of recurrent ischaemic *** CEA appears to be safe and well-tolerated in patients with *** studies with larger cohorts and longer follow-up intervals are needed in order to determine the role of CEA in this patient population.

关键词： patients carotid prevention

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The greening of everyday life

The greening of everyday life

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作者： (editor.)meyer john M. (editor..1967-)Kersten Jens

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