71,642 research outputs found
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Additions and Corrections: Hydrogen Storage in Graphite Nanofibers: Effect of Synthesis Catalyst and Pretreatment Conditions (langmuir (2004) 20 (714-721))
No full textHydrogen Storage in Graphite Nanofibers: Effect of Synthesis Catalyst and Pretreatment ConditionsAngela D. Lueking, Ralph T. Yang,* Nelly M. Rodriguez, and R. Terry K. Baker Langmuir 2004, 20, 714-721.
Reference 5 was incorrectly cited. The correct reference reads as follows: (5)
Dillon, A. C.; Jones, K. M.; Bekkedahl, T. A.; Kiang, C. H.; Bethune, D. S.; Heben, M. J. Na
Calophyllum sp. from Colombia collected by W. López, J. Rodriguez, M. Salas #10630
No full textFile Name: TOLI-25000-AMA-01-C-315.jpg
CÓDIGO FOTO: TOLI-25000-AMA-01-C-315-
Fotografía: SI
Nº TOLI: TOLI-25000
PARCELA: AMA-01
CÓDIGO: C-315
Nº COLECTA: 10630
NUEVOS COLECTORES: Wilmar López Oviedo
COLECTORES: W. López, J. Rodriguez, M. Salas
Nº MUESTRAS MONTADAS: 1
Homologación: No homologado
Nueva fecha del evento : 27/11/2018.
Fecha del evento: 01/05/2012.
Proyecto : Recursos Botánicos Disponibles en Línea (BRAVO) para la flora Colombiana
Hábitat: Bosque muy húmedo tropical (bmh-T)
Comentario del evento: Bosque de tierra firme
Continente: SA
Pais: Colombia
Estado/Provincia: Chocó
Municipio: Nuquí
Centro poblado / Cabecera municipal: Arusí
Localidad: Reserva Natural El Amargal
Elevación minima en metros: 50
Elevación maxima en metros: 300
Latitud: 5.578
Longitud original: -77.500
datum geodésico: WGS 84
Latitud decimal: 5.578
Longitud decimal: -77.500
Identificado por: Wilmar López
Fecha de identificación: 16/05/2019.
Nombre cientifico: Calophyllum sp.
Reino: Plantae
Filo: Magnoliophyta
Clase: Equisetopsida
Familia nueva: Calophyllaceae
genero herbario: NN
Especie de herbario para TNRS: NN
Especie corregida herbario y desde TNRS: Indet indet
Familia corregida desde TNRS: Calophyllaceae
: 4033
Sin nombre cientif: 1</p
Mesophilic-hydrothermal-thermophilic (M-H-T) digestion of green corn straw
No full textMesophilic-hydrothermal (80-160 degrees C, 30 min)-thermophilic (M-H-T) digestion and control tests of mesophilic (M), thermophilic (T), hydrothermal-mesophilic (H-M), and mesophilic-thermophilic digestion (M-T) of green corn straw were conducted for a 20-day fermentation period. The results indicate that M-H-T is an efficient method to improve methane production. A maximum methane yield of 371.74 mL/g volatile solid was obtained by the M (3 days)-H (140 degrees C)-T (17 days) process, which was 20.44%, 16.55%, 31.44%, and 14.31% higher than the yields of the M, T, 140-M, and M-T processes. The enhanced methane production was attributed to (1) the improved hemicellulose degradation and lignin disorganization; (2) prevention of the degradation of soluble sugar, easily hydrolyzed hemicellulose and cellulose into furfural and methylfurfural; and (3) lack of formation of Maillard reaction products during initial hydrothermal treatment. (C) 2015 Elsevier Ltd. All rights reserved
LaTeX as an inclusive accessibility instrument for highschool mathematical education
No full textThis paper describes the design, implementation and outcomes of a teaching activity in high school setting, aimed at supporting a student with visual impairments in learning Mathematics and promoting inclusive learning involving all other students. The teaching activity was defined following an adoption-centered approach. During the initial needs-finding stage, we explored the available instruments for inclusive access and authoring of mathematical formulae, and we identified the LaTeX typesetting language as the instrument of choice. The use of LaTeX was motivated by the fact that it provides a textual representation of mathematical content, thus making it accessible through standard assistive technologies, such as Braille displays and screen readers. LaTeX is also widely used in higher education to author scientific documents, and therefore constitutes a useful skill for future education and employment of all students. We then defined the main steps needed for addressing the topic during a traditional high school mathematical curriculum, and scheduled them in relation to other teaching activities. The students had no difficulties in following the teaching activity, including learning and using LaTeX, and most were eager to apply the acquired skills for authoring lab reports and homework. However, the acceptance of the assistive tool by the student with visual impairments was low. Additionally, most of the other teachers displayed high resistance to change and therefore were not interested in supporting the activity and integrating it with their classes. We highlight the key findings and limitations of the project, and discuss possible improvements over the current approach
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Author Correction: Validating a breast cancer score in Spanish women. The MCC-Spain study (Scientific Reports, (2018), 8, 1, (3036), 10.1038/s41598-018-20832-0)
No full textDierssen-Sotos, T., Gómez-Acebo, I., Palazuelos, C., Fernández-Navarro, P., Altzibar, J.M., González-Donquiles, C., Ardanaz, E., Bustamante, M., Alonso-Molero, J., Vidal, C., Bayo-Calero, J., Tardón, A., Salas, D., Marcos-Gragera, R., Moreno, V., Rodriguez-Cundin, P., Castaño-Vinyals, G., Ederra, M., Vilorio-Marqués, L., Amiano, P., Pérez-Gómez, B., Aragonés, N., Kogevinas, M., Pollán, M., Llorca, J
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
NN from Colombia collected by L. Ramos, E. Álvarez, J. Cabezas, J. Rodriguez & C. Ibañez #79
No full textFile Name: TOLI-26880-SOC-01-27-M-79.jpg
CÓDIGO FOTO: TOLI-26880-SOC-01-27-M-79-
Fotografía: SI
Nº TOLI: TOLI-26880
PARCELA: SOC-01
CÓDIGO: 27-M-79
Nº COLECTA: 79
NUEVOS COLECTORES: Laura Isabel Ramos
COLECTORES: L. Ramos, E. Álvarez, J. Cabezas, J. Rodriguez & C. Ibañez
Nº MUESTRAS MONTADAS: 1
Homologación: No homologado
Nueva fecha del evento : 21/12/2018.
Fecha del evento: 16/12/2018.
Proyecto : Recursos Botánicos Disponibles en Línea (BRAVO) para la flora Colombiana
Hábitat: Bosque húmedo tropical (bh-T)
Continente: SA
Pais: Colombia
Estado/Provincia: Meta
Municipio: Puerto López
Centro poblado / Cabecera municipal: La Serranía
Localidad: Reserva Natural El Amparo
Elevación minima en metros: 200
Elevación maxima en metros: 250
Latitud: 4.020
Longitud original: -72.600
datum geodésico: WGS 84
Latitud decimal: 4.020
Longitud decimal: -72.600
Nombre cientifico: NN
Reino: Plantae
Filo: Magnoliophyta
Clase: Equisetopsida
Orden: Celastrales
Familia nueva: Celastraceae
Género nuevo: NN
: Celastraceae
genero herbario: NN
Especie de herbario para TNRS: NN
Especie corregida herbario y desde TNRS: Indet indet
Familia corregida desde TNRS: Celastraceae
: 5598</p
Hundreds of variants clustered in genomic loci and biological pathways affect human height
No full textMost common human traits and diseases have a polygenic pattern of inheritance: DNA sequence variants at many genetic loci influence the phenotype. Genome-wide association (GWA) studies have identified more than 600 variants associated with human traits(1), but these typically explain small fractions of phenotypic variation, raising questions about the use of further studies. Here, using 183,727 individuals, we show that hundreds of genetic variants, in at least 180 loci, influence adult height, a highly heritable and classic polygenic trait(2,3). The large number of loci reveals patterns with important implications for genetic studies of common human diseases and traits. First, the 180 loci are not random, but instead are enriched for genes that are connected in biological pathways (P = 0.016) and that underlie skeletal growth defects (P<0.001). Second, the likely causal gene is often located near the most strongly associated variant: in 13 of 21 loci containing a known skeletal growth gene, that gene was closest to the associated variant. Third, at least 19 loci have multiple independently associated variants, suggesting that allelic heterogeneity is a frequent feature of polygenic traits, that comprehensive explorations of already-discovered loci should discover additional variants and that an appreciable fraction of associated loci may have been identified. Fourth, associated variants are enriched for likely functional effects on genes, being over-represented among variants that alter amino-acid structure of proteins and expression levels of nearby genes. Our data explain approximately 10% of the phenotypic variation in height, and we estimate that unidentified common variants of similar effect sizes would increase this figure to approximately 16% of phenotypic variation (approximately 20% of heritable variation). Although additional approaches are needed to dissect the genetic architecture of polygenic human traits fully, our findings indicate that GWA studies can identify large numbers of loci that implicate biologically relevant genes and pathways
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