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Wyszukujesz frazę "Contreras, S." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Influence of Interface-Induced Disorder on Classical and Quantum Conductivity of CdTe:IN Epitaxial Layers
Autorzy:
Łusakowski, J.
Karpierz, K.
Grynberg, M.
Karczewski, G.
Wojtowicz, T.
Contreras, S.
Callen, O.
Powiązania:
https://bibliotekanauki.pl/articles/1968369.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Jt
73.61.Ga
Opis:
An influence of disorder originated from the substratelayer interface on electrical properties of CdTe:In layers was investigated by means of the Hall effect and magnetoresistance measurements at low temperatures. An estimation of a scattering rate due to interface-induced disorder is given. Characteristic features of a magnetic field dependence of magnetoresistance are explained by an influence of quantum interference of scattered electron waves both in the hopping and the free electron conductivity regimes.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 911-914
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Games and ADHD-ADD: A Systematic Mapping Study
Autorzy:
Contreras-Espinosa, Ruth S.
Serra, Angel
Terrón, Jose Luis
Powiązania:
https://bibliotekanauki.pl/articles/485131.pdf
Data publikacji:
2019
Wydawca:
Univerzita sv. Cyrila a Metoda. Fakulta masmediálnej komunikácie
Tematy:
adolescents
attention deficit disorder
attention deficit hyperactivity disorder digital games
children
literature review
systematic mapping study
Opis:
Attention Deficit Hyperactivity Disorder (ADHD) is a neuro-developmental disorder that starts in childhood and has a persistent pattern of behaviour involving lack of attention and/or hyperactivity-impulsiveness that interferes in social, academic or work processes, or reduces the quality of them. Through activities with games, children and adolescents improve memory, concentration, motor planning and time management skills. According to some studies these may present positive effects for the attention span, executive functions, working memory and other cognitive skills. However, there are few studies that explain their effects. This paper presents a systematic mapping study and underlines the direction taken by the empirical studies undertaken on the use of digital games in treating ADHD and ADD. A total of 12 articles, covering 2005 to 2015, were selected. The research questions behind the study were: RQ1 What particular characteristics have been investigated by researchers?; RQ2 What research methods have been used?; and RQ3 On which game has the study on ADD-ADHD been focused?. There are studies are focused on the risk of addiction, increased attention deficit or behaviour problems and studies evaluating the improvement in executive functions, reduction in hyperactivity and motivation. The research methods used were experimental and exploratory methods. Finally, the digital games are analyzed without distinguishing between the genres and theme of the game.
Źródło:
Acta Ludologica; 2019, 2, 2; 4-26
2585-8599
Pojawia się w:
Acta Ludologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure Refinement of the Semiconducting Compound $Cu_3TaS_4$ from X-Ray Powder Diffraction Data
Autorzy:
Delgado, G.
Contreras, J.
Mora, A.
Durán, S.
Muñoz, M.
Grima-Gallardo, P.
Powiązania:
https://bibliotekanauki.pl/articles/1493612.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Nw
61.66.Fn
Opis:
The ternary compound $Cu_{3}TaS_{4}$ has been investigated by means of X-ray powder diffraction and its structure has been refined by the Rietveld method. This compound is isostructural with the sulvanite mineral $Cu_{3}VS_{4}$, and crystallizes in the cubic $P \bar{4} 3m$ space group (No. 215), Z = 1, with unit cell parameters a = 5.5145(1) Å and V = 167.70(1) $Å^{3}$. The refinement of 14 instrumental and structural parameters converged to $R_{p}$ = 4.4%, $R_{wp}$ = 6.8%, $R_{exp}$ = 5.5% and S = 1.2 for 4501 step intensities and 33 independent reflections.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 468-472
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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