Search results for "standing"

A theoretical approach of the propagation through geometrical constraints in cardiac tissue

2007

International audience; The behaviour of impulse propagation in the presence of non-excitable scars and boundaries is a complex phenomenon and induces pathological consequences in cardiac tissue. In this article, a geometrical con¯guration is considered so that cardiac waves propagate through a thin strand, which is connected to a large mass of cells. At this interface, waves can slow down or even be blocked depending on the width of the strand. We present an analytical approach leading to determine the blockade condition, by introducing planar travelling wavefront and circular stationary wave. Eventually, the in°uence of the tissue geometry is examined on the impulse propagation velocity.

Electromagnetically induced transparency in Doppler-broadened three-level systems with resonant standing wave drive

2005

Summary form only given. Electromagnetically induced transparency (EIT) and related phenomena such as lasing without inversion (LWI) are topics of increasing interest in quantum optics. In EIT, an otherwise absorbing medium is made transparent to a weak coherent field on resonance with a certain atomic transition by applying an intense coherent "driving" field to an adjacent transition. There has been a large number of theoretical papers and EIT was demonstrated experimentally. Up to now, most theoretical papers dealing with EIT in gas media have considered only the case of a traveling (TW) driving field. In contrast, we study EIT in Doppler broadened three-level media with standing wave (S…

Regioninės kultūros samprata rengiant mokytojus Latvijoje, Lietuvoje ir Norvegijoje: lyginamoji atvejo analizė.

2019

Straipsnyje nagrinėjama regionų kultūra, regioninių tradicijų svarba, siekiant šalies kultūrinio tvarumo. Vis dėlto regioninių tradicijų puoselėjimas dažnai laikomas kliūtimi globalizacijai ir daugiakultūriškumui. Kyla klausimas: kaip apsaugoti ir plėtoti regionų kultūrinę įvairovę, kultūros paveldą? Mokytojų rengimui tenka svarbi misija ‒ plėtoti idėjas apie regioninės kultūros svarbą, inicijuoti jos išsaugojimą bei ieškoti jungčių tarp regioninio ir globalaus konteksto. Tyrimu siekiama nustatyti, kokie faktoriai skatina arba trukdo plėtoti būsimųjų mokytojų kompetencijas, kurios leistų sėkmingai ugdyti pradinės mokyklos mokinių regioninės kultūros supratimą. Lyginamoji trijų šalių (Latvij…

Threshold Concepts for Modeling and Assessing Higher Education Students’ Understanding and Learning in Economics

2018

In the last decade, the research carried out on threshold concepts as a content-based way to model students’ understanding and learning in several domains has increased. However, empirical evidence on this approach is still scarce. In this chapter, the authors investigate the adequacy of the threshold concepts approach in the domain of business and economics in higher education following an established differentiation between basic, discipline, and modeling thresholds. After conducting a cognitive interview study using verbal reports, a self-assessment questionnaire was used to assess the respondents’ familiarity with the content and their security to solve the tasks. Results indicate that …

Responsiveness to change and reliability of measurement of radiographic joint space width in osteoarthritis of the knee: a systematic review

2011

Import JabRef | WosArea Orthopedics; Rheumatology; International audience; Objective: The goal of this systematic review was to report the responsiveness to change and reliability of conventional radiographic joint space width (JSW) measurement. Method: We searched the PubMed and Embase databases using the following search criteria: [osteoarthritis (OA) (MeSH)] AND (knee) AND (X-ray OR radiography OR diagnostic imaging OR radiology OR disease progression) AND (joint space OR JSW or disease progression). We assessed responsiveness by calculating the standardized response mean (SRM). We assessed reliability using intra- and inter-reader intra-class correlation (ICC) and coefficient of variati…

Species richness-standing crop relationship in stream bryophyte communities: patterns across multiple scales

2001

Summary 1 We tested for a unimodal (‘hump-backed’) relationship between species richness and standing crop at various spatial scales in stream bryophyte communities. Bryophyte species and their biomasses were determined from 20 to 25 quadrats in eight river and six stream sites in northern Finland. 2 Regression analyses revealed a quadratic relationship between richness and biomass in only two of the river sites and a positive correlation in one other. A quadratic relationship was detected in three stream sites and richness increased linearly with biomass in another. 3 We also tested for the hump-shaped pattern across individual stream boulders, representing an elevational gradient from con…

How do we understand other's intentions? - An implementation of mindreading in artificial systems -

Students' Understanding of the Special Theory of Relativity and Design for a Guided Visit to a Science Museum

2009

International audience; This paper describes the design of teaching materials that are used as learning tools in school visits to a science museum. An exhibition on the A century of the Special Theory of Relativity, in the Kutxaespacio Science Museum, in San Sebastian (Spain), was used to design a visit for first year engineering students at the university and assess the learning which was achieved. The first part of the paper presents the teaching sequence which was designed to build a bridge between formal teaching and the exhibition visit. The second part analyses the potential of the exhibition and the aforementioned teaching sequence to influence the students' knowledge of three aspect…

Action Recognition based on Hierarchical Self-Organizing Maps

2014

We propose a hierarchical neural architecture able to recognise observed human actions. Each layer in the architecture represents increasingly complex human activity features. The first layer consists of a SOM which performs dimensionality reduction and clustering of the feature space. It represents the dynamics of the stream of posture frames in action sequences as activity trajectories over time. The second layer in the hierarchy consists of another SOM which clusters the activity trajectories of the first-layer SOM and thus it learns to represent action prototypes independent of how long the activity trajectories last. The third layer of the hierarchy consists of a neural network that le…

Hierarchies of Self-Organizing Maps for action recognition

2016

We propose a hierarchical neural architecture able to recognise observed human actions. Each layer in the architecture represents increasingly complex human activity features. The first layer consists of a SOM which performs dimensionality reduction and clustering of the feature space. It represents the dynamics of the stream of posture frames in action sequences as activity trajectories over time. The second layer in the hierarchy consists of another SOM which clusters the activity trajectories of the first-layer SOM and learns to represent action prototypes. The third - and last - layer of the hierarchy consists of a neural network that learns to label action prototypes of the second-laye…