Search results for "kimmoisuus"
showing 10 items of 21 documents
On modelling and stability of axially moving viscoelastic materials
2013
Investigation of the elastic and inelastic scattering of 4He from 11B in the energy range 29-50.5 MeV
2018
We have measured the angular distributions for the elastic and inelastic scattering of 4He from 11B in the isochronous cyclotron U-150 M INP RK. The extracted α-particles beam has been accelerated to energy 29 MeV and then directed to 11B target. The experimental results were analyzed within the framework of both the optical model using different complex potential and the double folding potential obtained with different density-dependent NN interactions which give the corresponding values of the nuclear incompressibility K in the Hartree-Fock calculation of nuclear matter. peerReviewed
Discrete element model for viscoelastic materials with brittle fracture : applications on glacier dynamics
2017
Kuudesluokkalaisten nuorten temperamentin, akateemisen kimmoisuuden ja koulustressin väliset yhteydet
2016
Tässä tutkimuksessa tarkasteltiin kuudesluokkalaisten nuorten temperamentin, akateemisen kimmoisuuden ja koulustressin välisiä yhteyksiä lukuvuoden aikana. Tutkimus on osa TIKAPUU - Alakoulusta yläkouluun -tutkimushanketta, johon osallistuu noin 800 keskisuomalaista nuorta. Tutkimuksessa selvitettiin, vaikuttaako oppilaan akateeminen kimmoisuus eli uskomus siitä, että hän kykenee selviytymään menestyksekkäästi koulunkäyntiin liittyvistä haasteista ja vastoinkäymisistä, hänen koulustressin kokemukseensa ja sen muutokseen lukuvuoden aikana. Tutkimuksessa tarkasteltiin myös temperamentin negatiivisen affektiivisuuden ja tahdonalaisen itsesäätelyn yhteyksiä koulustressiin ja sen muutokseen. Vii…
Approximation of pre-twisted Achilles sub-tendons with continuum beam elements
2022
Achilles sub-tendons are materially and geometrically challenging structures that can nearly undergo around 15% elongation from their pre-twisted initial states during physical activities. Sub-tendons' cross-sectional shapes are subject-specific, varying from simple to complicated. Therefore, the Achilles sub-tendons are often described by three-dimensional elements that lead to a remarkable number of degrees of freedom. On the other hand, the continuum-based beam elements in the framework of the absolute nodal coordinate formulation have already been shown to be a reliable and efficient replacement for the three-dimensional continuum elements in some special problems. So far, that element …
The stress-strain state and stabilization of viscoelastoplastic, imperfect moving web continuum
2014
Added-Mass Based Efficient Fluid–Structure Interaction Model for Dynamics of Axially Moving Panels with Thermal Expansion
2020
The paper considers the analysis of a traveling panel, submerged in axially flowing fluid. In order to accurately model the dynamics and stability of a lightweight moving material, the interaction between the material and the surrounding air must be taken into account. The lightweight material leads to the inertial contribution of the surrounding air to the acceleration of the panel becoming significant. This formulation is novel and the case complements our previous studies on the field. The approach described in this paper allows for an efficient semi-analytical solution, where the reaction pressure of the fluid flow is analytically represented by an added-mass model in terms of the panel…
Modeling the mechanical behavior of carbon nanostructures
2016
Low-dimensional nanostructures are expected to have vast number of applications in the future. Particularly large amount of research has been invested in the atomthick carbon membrane called graphene, which has become popular due to its unique electronic and mechanical properties. This thesis presents studies of the mechanical and electromechanical properties of several different types of graphene nanostructures. In addition, short detours are performed in order to study the elasticity of gold nanostructures and topology effects in graphene nanoribbons. The research is performed by using several different simulation methods. In simulations the system parameters and environment can be chosen…
Анализ и оптимизация устойчивости балок на сплошном упругом основании часть I (балки конечной длины) [Analysis and optimization of a beam on elastic …
2017
Problems of defining the optimal (against buckling) cross section area distribution for beams interacting with elastic foundation are considered. The stability of limited pinned beams and infinite continuous beams is analyzed. For all beams under consideration, the stability analysis is performed as for constant as for variable distributions of strength beam characteristics. The critical length is determined and the variational statement of beam stability problems is presented for this beam type. The exact solution of optimal problem is presented in the case of linear dependence of limited beam bending hardness on beam cross section area. For the case of squared and cubic dependences, the n…
In vivo muscle mechanics during human locomotion : fascicle-tendinous tissue interaction during stretch-shortening cycle exercises
2005
Masaki Ishikawan tutkimuksessa selvitettiin, kuinka lihasten ja jännerakenteiden yhteistoiminta hyödyntää elastista energiaa ihmisen liikkumisessa. Ulomman reisilihaksen ja kolmipäisen pohjelihaksen lihassolujen ja jännerakenteiden pituuden muutoksia tarkasteltiin liikkeiden aikana ultraäänitekniikalla yhdessä ainutlaatuisen jänteen voimaa mittaavan optisen kuituanturin kanssa. The present series of studies were designed to examine how the interaction between muscle fibers and tendinous tissues (TT) were modulated for effective utilization of elastic energy during stretch-shortening cycle (SSC) exercises. By combining the in vivo direct recordings of tendon force with fascicle length change…