检索结果-南通市图书馆

localisation and phase transition of acoustic waves in a soft medium containing air bubbles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2010年第9期19卷 428-436页

作者：梁彬邹欣晔程建春 Laboratory of Modern Acoustics Ministry of Educationand Institute of AcousticsNanjing University

We study via numerical experiments the localisation property of an acoustic wave in a viscoelastic soft medium containing randomly-distributed air bubbles. The behaviours of the oscillation phases of bubbles are particularly investigated in various cases for distinguishing efficiently the acoustic localisation from the effects of acoustic absorption caused by the viscosity of medium. The numerical results reveal the phenomenon of ＇phase transition＇ characterized by an unusual collective oscillation of bubbles, which is an effective criterion to unambiguously identify the acoustic localisation in the presence of viscosity. Within the localisation region, the phenomenon of phase transition persists, and a remarkable decrease in the fluctuation of the oscillation phases of bubbles is observed. The localisation phenomenon will be impaired by the enhancement of the viscosity factors, and the extent to which the acoustic wave is localised may be determined by appropriately analyzing the values of the oscillation phases or the amount of reduction of the phase fluctuation. The results are particularly significant for the practical experiments in an attempt to observe the acoustic localisation in such a medium, which is in general subjected to the interference of the great ambiguity resulting from the effect of acoustic absorption.

关键词： acoustic localisation phase transition viscoelastic soft medium air bubble

Deformation and localisation behaviours of reinforced gravelly backfill using shaking table tests

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2020年第1期12卷 102-111页

作者： H.Munoz T.Kiyota Institute of Industnial Science The University of TokyoTokyoJapan

To understand the deformational behaviours of geosynthetics-reinforced soil retaining walls(GRS RWs),a series of plane-strain shaking table tests was conducted on retaining wall models.The backfill of the models was made of poorly graded gravel.Deformations and strains in the gravelly backfill induced by seismic loading are recorded in real time,which are of importance to understand the seismic strength and stability of the GRS RW systems,as strain localisation development in the backfill and foundation is related to the degree of strength degradation of the system.In the present study,we aimed at quantifying the induced deformations of the GRS RW models due to shaking.Digital image correlation(DIC)technique was then employed to analyse and provide full-field deformation and motion images with the models.It is demonstrated that,unlike conventional contact devices that are yet limited to provide quantities of a singular and fixed location,DIC provides deformation and motion of the area of interests to reveal the evolution of localisation.

关键词： Geosynthetic-reinforced soil(GRS) Retaining wall(RW)model Shaking table test Digital image correlation(DIC) localisation

Transplantation to localisation:The Importation of Western Structural Technologies in Modern Shanghai Architecture Based on a Study of the Bund Buildings,1843–1943

在线全文

学校读者我要写书评

暂无评论

Built Heritage 2019年第1期3卷 3-13页

作者： Peng Zhang Yijiao Yang College of Architecture and Urban Planning Tongji UniversityShanghaiChina

Shanghai’s modern architectural heritage in the 19^(th) and early 20^(th) centuries is an essential aspect of modern Chinese architectural history because of its outstanding characteristics and well-preserved conditions.Modern Shanghai architecture was transformed by the importation of Western structural technologies and materials in addition to their forms and institutions.After 100 years of development since 1843,there were over 100 important buildings in the Bund area by 1943.These buildings were built in different periods using the best available structural technologies.This study focuses on the technological dimension of modern Shanghai architecture.Based on an architectural survey and a literature investigation of the Bund buildings,this study explores the evolution of modern structural technologies in Shanghai by analysing the Bund buildings’key structural factors.The influences of the localisation and implementation of Western architecture’s building technologies in Shanghai were also analysed,including time of importation,characteristics and integration of local craftsmanship and materials.This study focuses on the method and analyses of architectural technology history from not only technological and historical perspectives,but also a social sciences perspective.

关键词： Western structural technologies transplantation localisation Shanghai Bund Buildings

An Overview of Rationalization Theories of Non-simply Connected Spaces and Non-nilpotent Groups

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第10期38卷 1705-1721页

作者： Sergei O.IVANOV Laboratory of Modern Algebra and Applications St.Petersburg State University14th Line29bSaint Petersburg199178Russia

We give an overview of five rationalization theories for spaces(Bousfield-Kan’s Q-completion;Sullivan’s rationaliz ation;Bousifeld’s homology rationaliz ation;Casacuberta-Peschke’s Ω-rationalization;Gomez-Tato-Halperin-Tanré’s π-fiberwise rationalization)that extend the classical rationalization of simply connected spaces.We also give an overview of the corresponding rationalization theories for groups(Q-completion;HQ-localization;Baumslag rationalization)that extend the classical Malcev completion.

关键词： Rationalisation localisation rational homotopy theory group theory

Guest Editorial:Special issue on explainable AI empowered for indoor positioning and indoor navigation

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2023年第4期8卷 1101-1103页

作者： Ki‐Il Kim Aswani Kumar Cherukuri Xue Jun Li Tanveer Ahmad Muhammad Rafiq Shehzad Ashraf Chaudhry Chungnam National University DaejeonRepublic of Korea Vellore Institute of Technology VelloreIndia Auckland University of Technology AucklandNew Zealand Yeungnam University Gyeongsan‐siRepublic of Korea Abu Dhabi University Zayed CityUAE

The convergence of Internet of Things(IoT),vehicularad hoc network(VANET),and mobile ad hoc network relies on sensor networks to gather data from nodes or objects.These networks involve nodes,gateways,and anchors,operating on limited battery power,mainly used in broadcasting.IoT applications,like healthcare,smart cities,and transportation,often need position data and face challenges in delay sensitivity.localisation is important in ITS and VANETs,influencing autonomous vehicles,collision warning systems,and road information dissemination.A robust localisation system,often combining GPS with techniques like Dead Reckoning and Image/Video localisation,is essential for accuracy and security.Artificial intelligence(AI)integration,particularly in machine learning,enhances indoor wireless localisation effectiveness.Advancements in wireless communication(WSN,IoT,and massive MIMO)transform dense environments into programmable entities,but pose challenges in aligning self‐learning AI with sensor tech for accuracy and budget considerations.We seek original research on sensor localisation,fusion,protocols,and positioning algorithms,inviting contributions from industry and academia to address these evolving challenges.

关键词： anchor artificial intelligence GPS localisation mobile communication RSSI vehicle

Capsule-odometer: A concept to improve accurate lesion localisation

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 Gastroenterology 2013年第35期19卷 5943-5946页

作者： Alexandros Karargyris Anastasios Koulaouzidis National Library of Medicine National Institutes of HealthBethesda MD 20814 United States Endoscopy Unit Centre for Liver and Digestive Disorders The Royal Infirmary of EdinburghEdinburgh EH16 4SA Scotland United Kingdom

In order to improve lesion localisation in small-bowel capsule endoscopy,a modified capsule design has been proposed incorporating localisation and-in theorystabilization capabilities.The proposed design consists of a capsule fitted with protruding wheels attached to a spring-mechanism.This would act as a miniature odometer,leading to more accurate lesion localization information in relation to the onset of the investigation(spring expansion e.g.,pyloric opening).Furthermore,this capsule could allow stabilization of the recorded video as any erratic,non-forward movement through the gut is minimised.Three-dimensional(3-D)printing technology was used to build a capsule prototype.Thereafter,miniature wheels were also 3-D printed and mounted on a spring which was attached to conventional capsule endoscopes for the purpose of this proof-of-concept experiment.In vitro and ex vivo experiments with porcine small-bowel are presented herein.Further experiments have been scheduled.

关键词： Capsule endoscopy Odometer localisation Hardware Software

AMPK Subcellular localisation in <i>Dictyostelium discoideum</i>

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Molecular Biology 2015年第3期5卷 105-116页

作者： Paul B. Bokko Afsar Ahmed Paul R. Fisher School of Life Sciences La Trobe University Bundoora Australia Department of Veterinary Surgery and Theriogenology University of Maiduguri Maiduguri Nigeria Monash Medical Research Institute Monash University Clayton Australia

The Dictyostelium discoideum AMP-activated protein kinase (AMPK) snfA subcellular localization was studied in AX2 and stable HPF strains by use of AMPK antipeptide antibody and goat anti-rabbit Alexa-Flour 488-conjugated IgG antibody. The AMPK exhibited cytosolic localization patterns and uniform focalised concentrations in wild type and the strains alike. Constitutive activation and attenuation of the α subunit expression did not affect subcellular distribution of AMPK. However, snfA expression was more intense in strains in which AMPK was constitutively active compared with the AX2 but lesser in attenuation strains. The localisation of the snfA reinforced the putative standing that it had a plethora of cytoplasmic functions. Moreover, the oxidative cellular function would require a ubiquitous system and might coordinately regulate responses to metabolic requirements. Furthermore, the developmental phases of the life cycle would support the cytosolic localization;and since organelles were potentially reorganized or removed entirely during the transition from vegetative living to fruiting body morphology. This study provided insight into the subcellular distribution of AMPK in Dictyostelium discoideum. We demonstrated that AMPK localization was steady in AX2 and derived strains whether constitutively active or anti-sense inhibited depicting extreme genetic states.

关键词： AMPK α Subunit Dictyostelium discoideum Subcellular localisation AX2 Mitochondrial Assay

Challenges to The Workforce Localization in the Private Sector in Gulf Countries:Content Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Middle Eastern and Islamic Studies 2022年第2期16卷 148-164页

作者： Ahmed Al-Asfour James Rajasekar Aynur Charkasova School of Education Southern Illinois UniversityCarbondaleIllinoisUSA School of Business Morningside UniversitySioux CityIowaUSA University of Arkansas FayettevilleArkansasUSA

The discovery of oil in the Gulf countries brought strong economic growth and an influx of foreign workers for privately held companies.These countries have since maintained their growth by relying on expatriates from all over the world,particularly from South Asian countries.In contrast,locals were recruited for most of the public sector jobs.In response to significant population growth and high unemployment rates,these countries took on some initiatives,including the localisation of the workforce.This paper analyzes the current localisation effort,which is a process of replacing expatriates with local workers in six Gulf countries.A content analysis of literature is used to understand the challenges related to required skills,work hours,salary,language,and experience.Results indicate that these challenges have impeded localisation efforts in the private sector.This study has significant implications for global organisations and human resource development professionals seeking to localise a proportion of their workforce as a workforce management strategy.

关键词： Gulfization challenges localisation

Anisotropic modelling of Opalinus Clay behaviour: From triaxial tests to gallery excavation application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 53-66页

作者： Francois Bertrand Frédéric Collin Université de Liège Département ArGEnCo/Géomécanique Allée de la découverte 9 4000 Liège Belgium F.R.I.A Fonds de la Recherche Scientifique e FNRS Brussels Belgium

Deep repository in geological formations is the preferential solution considered in many countries to manage high-level nuclear wastes. In Switzerland, the Opalinus Clay is a candidate host rock. In this context, in situ and laboratory tests are conducted on Opalinus Clay to demonstrate the feasibility of deep disposal in this argillaceous formation. This paper presents a constitutive model able to fit the experimental data obtained from some triaxial tests conducted by Jahns(2013) on cores from borehole Schlattingen SLA-1. The elasto-plastic behaviour of Opalinus Clay is reproduced thanks to a DruckerPrager model, taking into account the anisotropy behaviour of this sedimentary rock. The objective is to employ a single set of parameters representative of the material. In a second version of the model, the stress-dependence of the elastic properties and damage are taken into account. Finally, the parameters calibrated with experimental tests are used to simulate the excavation of a gallery with a second gradient approach.

关键词： Opalinus Clay Schlattingen Constitutive modelling Anisotropy Dilatancy localisation Tunnel excavation