Search results for "Dynamic"

Shape optimization for Stokes problem with threshold slip boundary conditions

2017

This paper deals with shape optimization of systems governed by the Stokes flow with threshold slip boundary conditions. The stability of solutions to the state problem with respect to a class of domains is studied. For computational purposes the slip term and impermeability condition are handled by a regularization. To get a finite dimensional optimization problem, the optimized part of the boundary is described by B´ezier polynomials. Numerical examples illustrate the computational efficiency. peerReviewed

Analytical approach for the problems of dynamics and stability of a moving web

2015

Problems of dynamics and stability of a moving web, modelled as an elastic rod or string, and axially travelling between rollers (supports) at a constant velocity, are studied using analytical approaches. Transverse, longitudinal and torsional vibrations of the moving web are described by a hyperbolic second-order partial differential equation, corresponding to the string and rod models. It is shown that in the framework of a quasi-static eigenvalue analysis, for these models, the critical point cannot be unstable. The critical velocities of one-dimensional webs, and the arising non-trivial solution of free vibrations, are studied analytically. The dynamical analysis is then extended into t…

Structural Dynamics of Interfirm Knowledge Networks

2016

In this chapter, we investigate the drivers of interfirm network structural dynamics and their influence on knowledge creation and diffusion processes that occur in such networks over time. Interfirm knowledge networks are complex webs of linkages connecting a variety of idiosyncratic firms within and across industries. Aimed to contribute to answer the recent calls for a more dynamic and multilevel view to understand network structures and processes, we leverage the complex network research to formulate a multilevel theoretical framework that clarifies the structural dynamics and knowledge creation and diffusion potential of interfirm networks.

The Value Creation Process in Family Firms. A Dynamic Capabilities Approach

2008

While most family-business research has focused on studies related with trans-generational value creation, a gap still exists in understanding how this value is generated across genera-tions, especially in dynamic markets. The present research offers new insights through the lens of dynamic capabilities, which are generated by knowledge and in turn generate entre-preneurial performance for value creation in family business. Family inertia is considered to be a factor preventing the creation of dynamic capabilities. It depends on the family-business culture, where paternalism and entrepreneurial drive influence family inertia posi-tively and negatively, respectively. Four family firms from S…

Cognition in Interaction : Challenges in Assessing Persons with Sensory and Multiple disabilities

2021

This article reports a qualitative study of cognitive assessments of three teenagers with sensory and multiple disabilities, including moderate to profound developmental disability. The aim was to evaluate the possibilities for adapting standardized tests and the implementation of interactional partnership in assessment. Cognitive assessments were made with an individually-adapted psychological assessment tool, the Bayley Scales of Infant and Toddler Development. The assessment situations were video-recorded and analyzed based on sociocultural theories of early interaction, dynamic assessment, and the bodily-tactile modality of cognition. The results showed that the requirements for assessm…

Intranuclear dynamics in parvovirus infection

2009

Koncepcja dynamicznych zdolności jako podstawa rozwoju kompetencji przedsiębiorstwa

2016

Przedsiębiorstwa stale poszukują sposobów tworzenia przewagi konkurencyjnej. Wśród czynników oddziałujących na tworzenie przewagi konkurencyjnej ważne miejsce zajmują potencjały sukcesu przedsiębiorstwa, które obejmują: (1) zasoby, (2) zdolności oraz (3) kompetencje. Z kolei, wśród różnorodnych zdolności przedsiębiorstwa, szczególne znaczenie przypisuje się tzw. dynamicznym zdolnościom. Celem artykułu jest przedstawienie możliwości wykorzystania koncepcji dynamicznych zdolności w kształtowaniu i rozwoju kompetencji przedsiębiorstwa.

Zastosowanie CFD w ocenie drożności górnych dróg oddechowych

2016

Obliczeniowa dynamika płynów (CFD) to szybko rozwijająca się dziedzina nauki, mająca szereg zastosowań praktyc - znych. Od lat używana jest w aerodynamice, inżynierii, hydraulice, meteorologii, budownictwie oraz wielu innych dziedz - inach. Pierwsze publikacje dotyczące użycia CFD w medycynie dotyczyły przede wszystkim pulmonologii i kardiologii, czyli dziedzin, w których dynamiczne właściwości gazu i płynu odgrywają ważną rolę w prawidłowym funkcjonowa - niu organizmu. W laryngologii CFD umożliwia pomiar oraz wizualizację dynamicznie zmieniających się parametrów przepływu powietrza w górnych drogach oddechowych.

Introducing Golden Section in the Mathematics Class to Develop Critical Thinking from the STEAM Perspective

2021

The Golden Section is a mathematical concept that is one of the most famous examples of connections between mathematics and the arts. Despite its widespread references in various areas of nature, art, architecture, literature, music, or aesthetics, discussions of the golden ratio often turn out to be false or misleading. Most of the incorrect statements are based on approximations or stem from the lack of checking the facts, making scientific mistakes in verifying the original scientific, historical, cultural context, or performing arbitrary operations in the measurements. This article offers geometric data and measurements, which allow the students to explore the golden ratio in various co…

Antipredatory function of head shape for vipers and their mimics.

2011

Most research into the adaptive significance of warning signals has focused on the colouration and patterns of prey animals. However, behaviour, odour and body shape can also have signal functions and thereby reduce predators' willingness to attack defended prey. European vipers all have a distinctive triangular head shape; and they are all venomous. Several non-venomous snakes, including the subfamily Natricinae, commonly flatten their heads (also known as head triangulation) when disturbed. The adaptive significance of this potential behavioural mimicry has never been investigated. We experimentally tested if the triangular head shape typical of vipers offers protection against predation.…