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The dilemma of combining positive and negative items in scales
(Colegio Oficial de Psicologos Asturias, 2015)
Background: This study analyzed the advantages and disadvantages of
combining negative and positive items in scales in a Spanish-speaking
context. Method: Three telephone surveys of 233 people each were carried
out. In ...
Constructing a small modular stellarator in Latin America
(Institute of Physics Publishing, 2015-03)
This paper aims at briefly describing the design and construction issues of the stellarator of Costa Rica 1 (SCR-1). The SCR-1 is a small modular stellarator for magnetic confinement of plasma developed by the Plasma ...
30-Gb/s Optical Link Combining Heterogeneously Integrated III–V/Si Photonics With 32-nm CMOS Circuits
(Institute of Electrical and Electronics Engineers Inc., 2015-02)
We present a silicon photonics optical link utilizing heterogeneously integrated photonic devices driven by low-power advanced 32-nm CMOS integrated circuits. The photonic components include a quantum-confined Stark effect ...
Application of the X-ray densitometry in the evaluation of the quality and mechanical properties of biomass pellets
(Elsevier, 2015-04)
The use of the X-ray technique and the X-ray densitometry to determine pellet particle distribution and to understand the biomass compaction and its effects in pellet properties has been limited. The present work evaluates ...
Are magnetic resonances practical transport controllers in fusion plasmas? the TJ-II experience
(Institute of Physics Publishing, 2015-03)
The TJ-II stellarator is a mid-size Heliac design (high rotational transform, low magnetic shear) that allows for external control of the rotational transform profile. The long experience with locating diverse magnetic ...
Análisis y diseño de unidades de procesamiento de potencia para sistemas fotovoltaicos
(Instituto Tecnológico de Costa Rica, 2015)
Se presenta un documento en desarrollo que, pretender ser utilizado para fines educativos, con modelos matemáticos de los principales UPP utilizados para convertir distintos niveles y formas de onda de corriente continua ...
Physical properties and fiber dimension in Stem, Branch and root of Alder Wood
(Parlar Scientific Publications, 2015-01)
The aim of this study was to determine physical properties and fiber dimensions in stem, branch and root wood for alder (Alnus glutinosa L) species. For this purpose, three normal alder trees were selected from Khanican ...
Diferencias en la vivienda, albergues turísticos, lenguaje, el parentesco y percepción del turismo en las comunidades Bribri con diferentes niveles de aislamiento geográfico (Talamanca, Costa Rica)
(Cuadernos de Investigación UNED, 2015)
Tourism is an economic,
social and cultural activity that exerts positive and negative influences
on communities and ecosystems where it is implemented. Tourism
is occurring in the Talamanca valley communities of Yorkín, ...
Arquitectura de Alta Disponibilidad en DSpace: Repositorio TEC
(Instituto Tecnológico de Costa Rica, 2015)
En la actualidad, el acceso rápido, seguro y eficiente a la información es un aspecto muy importante para todos los usuarios. Un repositorio institucional que no garantiza el acceso a su contenido de forma eficiente y ...
Effects of thinning on diameter, heartwood, density and drying defects of gmelina arborea
(Universidade Federal de Sao Carlos, 2015)
The effect of three levels thinning intensity in Gmelina arborea plantation on tree diameter, heartwood (diameter and percentage), wood density and drying defects (twist, crook, bow and check) was studied. Wood used for ...