Escuelas y Departamentos: Envíos recientes
Mostrando ítems 261-280 de 615
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Evaluation of wood properties from six native species of forest plantations in Costa Rica
(Bosque, 2016)This study details information about physical, chemical and mechanical properties, drying, preservation and workability of wood from Cordia alliodora, Dipteryx panamensis, Enterolobium cyclocarpum, Hieronyma alchorneoides, ... -
Effects on density, shrinking, color changing and chemical surface analysis through FTIR of Tectona grandis thermo-treated: Density, shrinking, color changing and chemical analysis by FTIR of the thermally-treated teak wood
(Forest Sciences, 2016)Thermal-treatment wood is used as an option to improve durability of wood in recent years. This study evaluated the effect of temperature in thermally treated Tectona grandis wood in density, shrinking, color changing ... -
Effect of pretreatment temperature on the surface modification of diatomite with trimethylchlorosilane
(Journal of Porous Materials, 2016)Diatomite samples from Costa Rica were purified using acidic treatments with hydrochloric acid, thermally treated (400–1000 C) and then silylated with trimethylchlorosilane in toluene under inert atmosphere. The ... -
Effect of an energy supplementation, weaning and oestrous synchronisation on ovarian activity and ovulation in early postpartum primiparous Bos indicus cows raised in the tropics of Costa Rica
(Animal Production Science, 2016)To evaluate the effect of an energy supplementation, 26 postpartum Bos indicus cows were assigned either to receive an energy diet supplementation (n = 11, SSD) or no supplementation (n = 15, NSSD). Cows in the SSD ... -
Polyphenolic composition and antioxidant activity of aqueous and ethanolic extracts from Uncaria tomentosa bark and leaves
(Instituto Tecnológico de Costa Rica, 2018)Uncaria tomentosa constitutes an important source of secondary metabolites with diverse biological activities mainly attributed until recently to alkaloids and triterpenes. We have previously reported for the first-time ... -
E-bridge 3.0: A strategic approach to structural health monitoring of bridges in Costa Rica
(IFIP Advances in Information and Communication Technology, 2016)The general condition of road infrastructure is a major weakness of the Costa Rican economy. In particular, a significant percentage of national bridges show an average or critical condition regarding parts of their ... -
Development of the HBV-TEC hydrological model
(Elsevier, 2016)In this paper, the HBV-TEC hydrological model is presented. The development of this model version, aims to provide researchers and scholars with a stable and robust implementation of the HBV hydrological model based on the ... -
Comparative study of the optical behavior of a porphyrin encapsulated in sol-gel silica coatings and in solution as a function of pH
(Elsevier, 2016)We report a comparative optical spectral study as a function of pH on a porphyrin encapsulated in a solgel matrix and in methanol solution. Its response has been discussed in terms of pH-sensitivity as a function of the ... -
Characteristics and properties of torrefied biomass pellets from Gmelina arborea and Dipterix panamensis at different times
(Revista Chapingo, Serie Ciencias Forestales y del Ambiente, 2016)Torrefaction and pelletizing were studied in the generation of energy from lignocellulosic residues to increase the energy properties of the biomass. The aim of this study was torrefied sawdust from Gmelina arborea and ... -
Automated plant species identification: Challenges and Opportunities
(IFIP Advances in Information and Communication Technology, 2016)The number of species of macro organisms on the planet is estimated at about 10 million. This staggering diversity and the need to better understand it led inevitably to the development of classification schemes called ... -
La Aufklärung, desacuerdo y lo político en Jacques Rancière y Michel Foucault.
(Revista Letral, 2016)This paper explores the main tasks of critical research, which according to a negative dialectial reading of Rancière/Foucault link, targets the actuality of Kant’s question and the question of philosophy. What is ... -
Biopulp from pineapple leaf fiber produced by colonization with two white-rot fungi: Trametes versicolor and Pleurotus ostreatus
(BioResources, 2016)Trametes versicolor and Pleurotus ostreatus were used for the biopulping from pineapple leaf fiber (PALF). PALF substrate was subjected to T. versicolor for 2 to 6 weeks and to P. ostreatus for 4 to 8 weeks. The yields, ... -
An impedance spectroscopy ASIC for low-frequency characterization of biological samples
(Scopus, 2016)This paper describes the design and testing of an ASIC for impedance spectroscopy of biological samples at frequencies up to 40 kHz. The circuit is designed in the 350 nm AMS H35B4 technology and enables the measurement ... -
Assessing soil water repellency of a sandy field with visible near infrared spectroscopy
(Scopus, 2015)Soil water repellency (WR) is a widespread phenomenon caused by aggregated organic matter (OM) and layers of hydrophobic organic substances coating the surface of soil particles. These substances have a very low surface ... -
Evaluación de tres clases de trigo para la cría de Sitotroga cerealella (Lepidoptera: Gelechiidae) como hospedante utilizado en la cría de enemigos naturales
(Revista de la Sociedad Entomológica Argentina, 2016)The development of standard protocols for artificial rearing is essential for a suitable production of insects. The eggs of the wheat moth Sitotroga cerealella Olivier are used to rear the oophagous parasitoids of the genus ... -
Ganancia genética esperada en melina (Gmelina arborea Roxb.) en Córdoba (Colombia)
(Espitia, M., Murillo, O., & Castillo, C. (2016). Ganancia genética esperada en melina (Gmelina arborea Roxb.) en Córdoba (Colombia). Revista Árvore, 40(1), 71-80., 2016)El Departamento de Córdoba (Colombia) planea plantar 200000 ha para el 2025 y Gmelina arborea es una de las opciones dada su alta producción de biomasa en turnos cortos. El objetivo del estudio fue estimar el potencial ... -
A fault-tolerance protocol for parallel applications with communication imbalance
(IEEE, 2015)The predicted failure rates of future supercomputers loom the groundbreaking research large machines are expected to foster. Therefore, resilient extreme-scale applications are an absolute necessity to effectively use ... -
A simple approach for the design of operational transconductance amplifiers for low power signal processing
(IEEE, 2010)A simple approach for the design, fabrication and characterization of a operational trasconductance amplifier intended for work in low power applications is reported in this work. DC Measured parameters agree with ... -
Towards a fuzzy logic model for chemical risk assessment by inhalation in laboratories
(Proceedings of the 2015 IEEE 35th Central American and Panama Convention, CONCAPAN 2015, 2015)This paper presents a computational Fuzzy Logic Model for chemical hazards risk assessment by inhalation in laboratories. Some influence factors on chemical risk are deterministic but not completely measurable. As a ... -
Flexible silicon photonic transmitter with segmented modulator and 32 nm CMOS driver IC
(2016 Conference on Lasers and Electro-Optics, CLEO 2016, 2016)We present a novel silicon photonic transmitter including 90nm CMOS segmented modulator co-packaged with low power 32nm CMOS driver IC. Optical equalization is demonstrated for the first time with the multi-segment ...