Browsing by Subject "ESPECTROSCOPÍA"

Now showing items 1-13 of 13

    • A combined first-principles computational/experimental study on LiNi 0.66Co 0.17Mn 0.17O 2 as a potential layered cathode material 

      Saavedra-Arias, José; Venkateswara Rao, Chitturi; Shojan, Jifi; Manivannan, Ayyakkannu; Torres, Lorraine; Ishikawa, Yasuyuki; Katiyar, Ram (Elsevier, 2012-08-01)
      First-principles calculations are used to analyze the phase stability, formation energy, and Li intercalation potential for a series of layered cathode materials. The calculations show LiNi 0.66Co 0.17Mn 0.17O 2 as a ...

    • A methane sink in the Central American high elevation páramo: Topographic, soil moisture and vegetation effects 

      Chai, Leanne L.; Hernández Ramirez, Guillermo; Hik, David S; Barrio, Isabel C.; Frost, Carol M.; Chinchilla Soto, Isabel Cristina; Esquivel-Hernández, Germain (Elsevier B.V., 2020-03-15)
      Methane (CH4) is a strong greenhouse gas with a global warming potential 23 times larger than that of carbon dioxide. Characterizing ecosystems as either sources or sinks for methane and their magnitudes informs on biosphere ...

    • Analysis of non-covalent interactions between the nanoparticulate fillers and the matrix polymer as applied to shape memory performance 

      Sedat Gunes, I; Perez Bolivar, Cesar; Cao, Feina; Jimenez, Guillermo A.; Anzenbacher, Pavel; Sadhan, Jana (The Royal Society of Chemistry, 2010)
      Non-covalent interactions between filler particles and polyurethanes were investigated using fluorescence emission spectroscopy. The results were used in the analysis of shape memory (SM) performance of polyurethanes. ...

    • Caracterización Espectral y Detección de Flecha Seca en Palma Africana en Puntarenas, Costa Rica 

      Martínez Barbáchano, Rubén; Solís Miranda, Gustavo Adolfo (Universidad Nacional, Costa Rica, 2018-07-31)
      La agricultura de precisión en las últimas décadas ha visto notables avances técnicos que han permitido un mejor manejo de las explotaciones agrícolas, optimizando recursos e insumos aplicados. En el ámbito de la geomática, ...

    • Isolation and Characterization of Nanocellulose Obtained from Industrial Crop Waste Resources by Using Mild Acid Hydrolysis 

      Moreno, Galia; RAMÍREZ-AMADOR, KARLA ; ESQUIVEL ALFARO, MARIANELLY; Jiménez Villalta, Guillermo (Tech Science Press, 2018)
      Cellulose, microcrystalline cellulose and nanocellulose were prepared from three agricultural waste resources: pineapple leaf (PALF), banana rachis (BR), and sugarcane bagasse (SCB). Each waste resource was first converted ...

    • New advances in the method validation, extraction methods and measurement uncertainty for the determination of water-soluble hexavalent chromium in hydraulic cemen 

      Ramírez-Quesada, María Melania; Venegas Padilla, Jimmy; Sibaja, José; Calderón-Jiménez, Bryan (Elsevier, 2021)
      The quantification of Cr (VI) in the cement matrix is highly important, given the possibility of suffering illnesses including dermatitis, induced nasal carcinoma, and DNA damage produced by inhalation of and/or direct ...

    • Polymer gel dosimeter based on itaconic acid 

      Mattea, Facundo; Chacón, David; Vedelago, José; Valente, Mauro; Strumia, Miriam (2015-11)
      A new polymeric dosimeter based on itaconic acid and N, N'-methylenebisacrylamide was studied. The preparation method, compositions of monomer and crosslinking agent and the presence of oxygen in the dosimetric system were ...

    • Properties of low-lying states in 65Co from lifetime measurements 

      Olaizola, Bruno; Fraile, L. M.; Mach, H.; Nowacki, F.; Poves, A.; Aprahamian, A.; Briz, Jose Antonio; Cal-Gonzalez, Jacobo; Ghita, D.; Köster, U.; Kurcewicz, W.; Lesher, S. R.; Pauwels, D.; Picado, Esteban; Radulov, D.; Simpson, G. S.; Udias, Jose (American Physical Society, 2019)
      The low-energy structure of Co65 was studied by means of γ-and fast-timing spectroscopy at the ISOLDE/CERN facility. The known level scheme of Co65 populated following the β-decay of Fe65 was expanded. The experimental ...

    • Scattering of light by colloidal aluminosilicate particles Produces the unusual sky-blue color of Río Celeste (Tenorio Volcano Complex, Costa Rica) 

      Castellón, Erick; Martínez, María; Madrigal-Carballo, Sergio; Arias, María Laura; Vargas, William E.; Chavarría, Max (2013-09-18)
      Río Celeste (Sky-Blue River) in Tenorio National Park (Costa Rica), a river that derives from the confluence and mixing of two colorless streams-Río Buenavista (Buenavista River) and Quebrada Agria (Sour Creek)-is renowned ...

    • Seasonal impact of grazing, viral mortality, resource availability and light on the group‑specifc growth rates of coastal Mediterranean bacterioplankton 

      Sánchez, Olga; Ferrera, Isabel; Mabrito, Isabel; Gazulla, Carlotta R.; Sebastián, Marta; Auladell, Adriá; Marín, Carolina; Cardelús, Clara; Sanz-Sáez, Isabel; Pernice, Massimo Ciro; Marrase, Celia; Sala, Monserrat M.; Gasol, Josep M (Nature Research, 2020-12)
      Estimation of prokaryotic growth rates is critical to understand the ecological role and contribution of diferent microbes to marine biogeochemical cycles. However, there is a general lack of knowledge on what factors ...

    • Sizeable beta-strength in 31Ar (β3p) decay 

      Koldste, G.T.; Blank, B.; Borge, M.J.G.; Briz, J.A.; Carmona-Gallardo, M.; Fraile, L.M.; Fynbo, H.O.U.; Giovinazzo, J.; Johansen, J.G.; Thomas, J.C.; Jokinen, A.; Jonson, B.; Kurturkian-Nieto, T.; Nilsson, T.; Perea, A.; Pesudo, V.; Picado, Esteban; Riisager, K.; Saastamoinen, A.; Tengblad, O.; Van del Walle, J. (Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2014-10-07)
      We present for the first time precise spectroscopic information on the recently discovered decay mode β-delayed 3p-emission. The detection of the 3p events gives an increased sensitivity to the high energy part of the ...

    • Using visible-near-infrared spectroscopy to classify lichens at a Neotropical Dry Forest 

      Guzmán, J. Antonio; Laakso, Kati; López Rodríguez, Jose Carlos; Rivard, Benoit; Sanchez-Azofeifa, G.A.; López Rodríguez, José Carlos (Elsevier B.V., 2020-04)
      The optical properties of lichens have been traditionally explored in the context of geological mapping where the encrustation of lichens on rocks may influence the detection of minerals of interest. As of today, few studies ...

    • β- decay of 65Mn to 65Fe 

      Olaizola, Bruno; Fraille, L.M.; Mach, Henryk; Aprahamian, Ani; Briz, Jose Antonio; Cal-González, J.; Ghita, Dan Gabriel; Köester, U.; Kurcewicz, Wiktor; Lesher, S.R.; Pauwels, Dieter; Picado, Esteban; Poves, Alfredo; Radulov, D.; Simpson, G.S.; Udías, J.M. (American Physical Society, 2013-10-07)
      The low-energy structure of 65Fe has been studied by means of γ and fast-timing spectroscopy at the ISOLDE facility, CERN. A level scheme of 65Fe populated following the β-decay of 65Mn was established for the first time. ...