Search results for "Dimension"
showing 10 items of 2766 documents
Space-by-Time Modular Decomposition Effectively Describes Whole-Body Muscle Activity During Upright Reaching in Various Directions
2017
The modular control hypothesis suggests that motor commands are built from precoded modules whose specific combined recruitment can allow the performance of virtually any motor task. Despite considerable experimental support, this hypothesis remains tentative as classical findings of reduced dimensionality in muscle activity may also result from other constraints (biomechanical couplings, data averaging or low dimensionality of motor tasks). Here we assessed the effectiveness of modularity in describing muscle activity in a comprehensive experiment comprising 72 distinct point-to-point whole-body movements during which the activity of 30 muscles was recorded. To identify invariant modules o…
Divdimensionāla stimula slīpuma uztvere
2017
Maģistra darbs uzrakstīts uz 32 lappusēm latviešu valodā. Tas satur 20 attēlus un 25 atsauces uz izmantotajiem literatūras avotiem. Darba mērķis bija novērtēt telpiskās uztveres precizitāti dažādu profesiju pārstāvjiem. Pētījumā piedalījās 82 dalībnieki, no kuriem 34 bija Optometrijas un redzes zinātnes nodaļas bakalaura studenti, 18 maģistrantūras studenti, 15 Rīgas Tehniskās universitātes Arhitektūras un pilsētplānošanas studenti un 15 dalībnieki kontrolgrupā, Pētījuma rezultāti parādīja, ka no visām grupām arhitekti visprecīzāk spēj novērtēt slīpumu. Atšķirības starp pārējām grupām bija nenozīmīgas. Atslēgas vārdi: slīpuma uztvere, divdimensionāla plakne, binokulārā disparitāte, perspekt…
Sports teams as complex adaptive systems: manipulating player numbers shapes behaviours during football small-sided games
2016
Small-sided and conditioned games (SSCGs) in sport have been modelled as complex adaptive systems. Research has shown that the relative space per player (RSP) formulated in SSCGs can impact on emergent tactical behaviours. In this study we adopted a systems orientation to analyse how different RSP values, obtained through manipulations of player numbers, influenced four measures of interpersonal coordination observed during performance in SSCGs. For this purpose we calculated positional data (GPS 15 Hz) from ten U-15 football players performing in three SSCGs varying in player numbers (3v3, 4v4 and 5v5). Key measures of SSCG system behaviours included values of (1) players’ dispersion, (2) …
One-loop corrections to light cone wave functions: the dipole picture DIS cross section
2018
We develop methods needed to perform loop calculations in light cone perturbation theory using a helicity basis, refining the method introduced in our earlier work. In particular this includes implementing a consistent way to contract the four-dimensional tensor structures from the helicity vectors with d-dimensional tensors arising from loop integrals, in a way that can be fully automatized. We demonstrate this explicitly by calculating the one-loop correction to the virtual photon to quark-antiquark dipole light cone wave function. This allows us to calculate the deep inelastic scattering cross section in the dipole formalism to next-to-leading order accuracy. Our results, obtained using …
Smilts-grants un smilts atradņu krājumu aprēķinu metodes
2019
Pētījuma mērķis ir analizēt smilts-grants un smilts krājumu izmaiņas, salīdzinot Latvijā populārākās aprēķinu metodes ar trīsdimensionālo modelēšanu datorvidē. Precīza derīgo izrakteņu tilpumu aprēķināšanas metodika ir svarīga gan derīgo izrakteņu izstrādātājam, gan izstrādi regulējošajām valstiskajām institūcijām. Iepriekšējie pētījumi analizēja derīgo izrakteņu krājumu izmaiņas, izmantojot divdimensionālos slāņu virsmu modeļus, savukārt šajā pētījumā tiek analizēta jauna pieeja sarežģītas uzbūves smilts-grants un smilts atradņu krājumu aprēķināšanā, izmantojot slāņu saguluma trīsdimensionālo modelēšanu. Pētījuma rezultātā krājumi tika aprēķināti gan ar trīsdimensionālajiem modeļiem, gan a…
A broadening horizon: intervention in the field of migration as a path towards internationalization for Italian social work
2022
Due to a significant increase in migration flows to Italy over the last four decades, professional social work in Italy has been confronted with the ‘internationalization of social problems’ (Dominelli 2010) over these forty years. This fast and prolific process of immigration has forced institutions to deal with issues for which our society, policies, and service system, have not been properly prepared. This highlights the need to provide updated training to social workers regarding the ‘trans‐cultural approach’, to facilitate understanding of the meanings and the cultural models and the processes of care and assistance. Despite a substantial and well‐established commitment in the area of …
Relaciones entre las prácticas parentales y los estilos de socialización familiar en la cultura española: el modelo bidimensional y el ajuste de los …
2014
Tradicionalmente, los estudios sobre socialización parental pretenden relacionar dos aspectos principales: por una parte, la manera cómo los padres socializan sus hijos y, por otra parte, los efectos que las distintas maneras de socializar tienen sobre los hijos. Inicialmente, se puede decir que muchas teorías sobre la socialización parental apuntan hacia la existencia de dos dimensiones, que resumen las practicas de socialización parental. De modo general, estas dimensiones pueden ser denominadas como: La dimensión de Aceptacion/Implicacion: Representa el grado en que los padres muestran afecto y aceptación a sus hijos, les dan apoyo y se comunican razonando con ellos. En este estilo, el n…
Morphometric analysis of two calanchi areas in Sicily (Italy) by exploiting high resolution Digital Elevation Models
2013
In the Mediterranean areas, specifically in Sicily (Italy), irregular rainfalls, strong seasonal changes, scarce vegetation cover and, frequently, outcropping of clayey deposits favor water erosion phenomena. Badland landscapes are the result of severe erosion processes, characterized by steep slopes, sparse vegetation, high drainage density, rapid erosion rates and a shallow or non existing regolith profile. In this investigation we focused on the calanchi badland type, consisting of heavily dissected terrain with steep, unvegetated slopes and channels that rapidly incise and extend headwards. This research was carried out in two calanchi sites located in Sicily. The geometry of 25 badland…
SparseHC: A Memory-efficient Online Hierarchical Clustering Algorithm
2014
Computing a hierarchical clustering of objects from a pairwise distance matrix is an important algorithmic kernel in computational science. Since the storage of this matrix requires quadratic space with respect to the number of objects, the design of memory-efficient approaches is of high importance to this research area. In this paper, we address this problem by presenting a memory-efficient online hierarchical clustering algorithm called SparseHC. SparseHC scans a sorted and possibly sparse distance matrix chunk-by-chunk. Meanwhile, a dendrogram is built by merging cluster pairs as and when the distance between them is determined to be the smallest among all remaining cluster pairs. The k…
Neighbourhood effects and determinants of population changes in Italy: a spatial perspective
2023
Population trends in Italy are strongly spatially differentiated, with some munic- ipalities showing a systematic loss of population, and others showing an equally continuous demographic increase. Here, we focus our attention on the spatial dimension of population change, looking at how different socio-economic and demographic dimensions affect population changes, as well as their spatial effects. After performing a preliminary descriptive analysis of the trends of population growth and decline in Italy over the last 40 years and the relevant demographic components, we used a spatial Durbin model (SDM) to investigate the potential existence of a diffusion process and the determinants of the…